jade.js

(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.jade = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
(function (process){
'use strict';

/*!
 * Jade
 * Copyright(c) 2010 TJ Holowaychuk <tj@vision-media.ca>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Parser = require('./parser')
  , Lexer = require('./lexer')
  , Compiler = require('./compiler')
  , runtime = require('./runtime')
  , addWith = require('with')
  , fs = require('fs')
  , utils = require('./utils');

/**
 * Expose self closing tags.
 */

// FIXME: either stop exporting selfClosing in v2 or export the new object
// form
exports.selfClosing = Object.keys(require('void-elements'));

/**
 * Default supported doctypes.
 */

exports.doctypes = require('./doctypes');

/**
 * Text filters.
 */

exports.filters = require('./filters');

/**
 * Utilities.
 */

exports.utils = utils;

/**
 * Expose `Compiler`.
 */

exports.Compiler = Compiler;

/**
 * Expose `Parser`.
 */

exports.Parser = Parser;

/**
 * Expose `Lexer`.
 */

exports.Lexer = Lexer;

/**
 * Nodes.
 */

exports.nodes = require('./nodes');

/**
 * Jade runtime helpers.
 */

exports.runtime = runtime;

/**
 * Template function cache.
 */

exports.cache = {};

/**
 * Parse the given `str` of jade and return a function body.
 *
 * @param {String} str
 * @param {Object} options
 * @return {Object}
 * @api private
 */

function parse(str, options){

  if (options.lexer) {
    console.warn('Using `lexer` as a local in render() is deprecated and '
               + 'will be interpreted as an option in Jade 2.0.0');
  }

  // Parse
  var parser = new (options.parser || Parser)(str, options.filename, options);
  var tokens;
  try {
    // Parse
    tokens = parser.parse();
  } catch (err) {
    parser = parser.context();
    runtime.rethrow(err, parser.filename, parser.lexer.lineno, parser.input);
  }

  // Compile
  var compiler = new (options.compiler || Compiler)(tokens, options);
  var js;
  try {
    js = compiler.compile();
  } catch (err) {
    if (err.line && (err.filename || !options.filename)) {
      runtime.rethrow(err, err.filename, err.line, parser.input);
    } else {
      if (err instanceof Error) {
        err.message += '\n\nPlease report this entire error and stack trace to https://github.com/jadejs/jade/issues';
      }
      throw err;
    }
  }

  // Debug compiler
  if (options.debug) {
    console.error('\nCompiled Function:\n\n\u001b[90m%s\u001b[0m', js.replace(/^/gm, '  '));
  }

  var globals = [];

  if (options.globals) {
    globals = options.globals.slice();
  }

  globals.push('jade');
  globals.push('jade_mixins');
  globals.push('jade_interp');
  globals.push('jade_debug');
  globals.push('buf');

  var body = ''
    + 'var buf = [];\n'
    + 'var jade_mixins = {};\n'
    + 'var jade_interp;\n'
    + (options.self
      ? 'var self = locals || {};\n' + js
      : addWith('locals || {}', '\n' + js, globals)) + ';'
    + 'return buf.join("");';
  return {body: body, dependencies: parser.dependencies};
}

/**
 * Get the template from a string or a file, either compiled on-the-fly or
 * read from cache (if enabled), and cache the template if needed.
 *
 * If `str` is not set, the file specified in `options.filename` will be read.
 *
 * If `options.cache` is true, this function reads the file from
 * `options.filename` so it must be set prior to calling this function.
 *
 * @param {Object} options
 * @param {String=} str
 * @return {Function}
 * @api private
 */
function handleTemplateCache (options, str) {
  var key = options.filename;
  if (options.cache && exports.cache[key]) {
    return exports.cache[key];
  } else {
    if (str === undefined) str = fs.readFileSync(options.filename, 'utf8');
    var templ = exports.compile(str, options);
    if (options.cache) exports.cache[key] = templ;
    return templ;
  }
}

/**
 * Compile a `Function` representation of the given jade `str`.
 *
 * Options:
 *
 *   - `compileDebug` when `false` debugging code is stripped from the compiled
       template, when it is explicitly `true`, the source code is included in
       the compiled template for better accuracy.
 *   - `filename` used to improve errors when `compileDebug` is not `false` and to resolve imports/extends
 *
 * @param {String} str
 * @param {Options} options
 * @return {Function}
 * @api public
 */

exports.compile = function(str, options){
  var options = options || {}
    , filename = options.filename
      ? utils.stringify(options.filename)
      : 'undefined'
    , fn;

  str = String(str);

  var parsed = parse(str, options);
  if (options.compileDebug !== false) {
    fn = [
        'var jade_debug = [ new jade.DebugItem( 1, ' + filename + ' ) ];'
      , 'try {'
      , parsed.body
      , '} catch (err) {'
      , '  jade.rethrow(err, jade_debug[0].filename, jade_debug[0].lineno' + (options.compileDebug === true ? ',' + utils.stringify(str) : '') + ');'
      , '}'
    ].join('\n');
  } else {
    fn = parsed.body;
  }
  fn = new Function('locals, jade', fn)
  var res = function(locals){ return fn(locals, Object.create(runtime)) };
  if (options.client) {
    res.toString = function () {
      var err = new Error('The `client` option is deprecated, use the `jade.compileClient` method instead');
      err.name = 'Warning';
      console.error(err.stack || /* istanbul ignore next */ err.message);
      return exports.compileClient(str, options);
    };
  }
  res.dependencies = parsed.dependencies;
  return res;
};

/**
 * Compile a JavaScript source representation of the given jade `str`.
 *
 * Options:
 *
 *   - `compileDebug` When it is `true`, the source code is included in
 *     the compiled template for better error messages.
 *   - `filename` used to improve errors when `compileDebug` is not `true` and to resolve imports/extends
 *   - `name` the name of the resulting function (defaults to "template")
 *
 * @param {String} str
 * @param {Options} options
 * @return {Object}
 * @api public
 */

exports.compileClientWithDependenciesTracked = function(str, options){
  var options = options || {};
  var name = options.name || 'template';
  var filename = options.filename ? utils.stringify(options.filename) : 'undefined';
  var fn;

  str = String(str);
  options.compileDebug = options.compileDebug ? true : false;
  var parsed = parse(str, options);
  if (options.compileDebug) {
    fn = [
        'var jade_debug = [ new jade.DebugItem( 1, ' + filename + ' ) ];'
      , 'try {'
      , parsed.body
      , '} catch (err) {'
      , '  jade.rethrow(err, jade_debug[0].filename, jade_debug[0].lineno, ' + utils.stringify(str) + ');'
      , '}'
    ].join('\n');
  } else {
    fn = parsed.body;
  }

  return {body: 'function ' + name + '(locals) {\n' + fn + '\n}', dependencies: parsed.dependencies};
};

/**
 * Compile a JavaScript source representation of the given jade `str`.
 *
 * Options:
 *
 *   - `compileDebug` When it is `true`, the source code is included in
 *     the compiled template for better error messages.
 *   - `filename` used to improve errors when `compileDebug` is not `true` and to resolve imports/extends
 *   - `name` the name of the resulting function (defaults to "template")
 *
 * @param {String} str
 * @param {Options} options
 * @return {String}
 * @api public
 */
exports.compileClient = function (str, options) {
  return exports.compileClientWithDependenciesTracked(str, options).body;
};

/**
 * Compile a `Function` representation of the given jade file.
 *
 * Options:
 *
 *   - `compileDebug` when `false` debugging code is stripped from the compiled
       template, when it is explicitly `true`, the source code is included in
       the compiled template for better accuracy.
 *
 * @param {String} path
 * @param {Options} options
 * @return {Function}
 * @api public
 */
exports.compileFile = function (path, options) {
  options = options || {};
  options.filename = path;
  return handleTemplateCache(options);
};

/**
 * Render the given `str` of jade.
 *
 * Options:
 *
 *   - `cache` enable template caching
 *   - `filename` filename required for `include` / `extends` and caching
 *
 * @param {String} str
 * @param {Object|Function} options or fn
 * @param {Function|undefined} fn
 * @returns {String}
 * @api public
 */

exports.render = function(str, options, fn){
  // support callback API
  if ('function' == typeof options) {
    fn = options, options = undefined;
  }
  if (typeof fn === 'function') {
    var res
    try {
      res = exports.render(str, options);
    } catch (ex) {
      return fn(ex);
    }
    return fn(null, res);
  }

  options = options || {};

  // cache requires .filename
  if (options.cache && !options.filename) {
    throw new Error('the "filename" option is required for caching');
  }

  return handleTemplateCache(options, str)(options);
};

/**
 * Render a Jade file at the given `path`.
 *
 * @param {String} path
 * @param {Object|Function} options or callback
 * @param {Function|undefined} fn
 * @returns {String}
 * @api public
 */

exports.renderFile = function(path, options, fn){
  // support callback API
  if ('function' == typeof options) {
    fn = options, options = undefined;
  }
  if (typeof fn === 'function') {
    var res
    try {
      res = exports.renderFile(path, options);
    } catch (ex) {
      return fn(ex);
    }
    return fn(null, res);
  }

  options = options || {};

  options.filename = path;
  return handleTemplateCache(options)(options);
};


/**
 * Compile a Jade file at the given `path` for use on the client.
 *
 * @param {String} path
 * @param {Object} options
 * @returns {String}
 * @api public
 */

exports.compileFileClient = function(path, options){
  var key = path + ':client';
  options = options || {};

  options.filename = path;

  if (options.cache && exports.cache[key]) {
    return exports.cache[key];
  }

  var str = fs.readFileSync(options.filename, 'utf8');
  var out = exports.compileClient(str, options);
  if (options.cache) exports.cache[key] = out;
  return out;
};

/**
 * Express support.
 */

exports.__express = function(path, options, fn) {
  if(options.compileDebug == undefined && process.env.NODE_ENV === 'production') {
    options.compileDebug = false;
  }
  exports.renderFile(path, options, fn);
}

}).call(this,require('_process'))
},{"./compiler":2,"./doctypes":3,"./filters":4,"./lexer":6,"./nodes":16,"./parser":23,"./runtime":24,"./utils":25,"_process":28,"fs":26,"void-elements":34,"with":35}],2:[function(require,module,exports){
'use strict';

var nodes = require('./nodes');
var filters = require('./filters');
var doctypes = require('./doctypes');
var runtime = require('./runtime');
var utils = require('./utils');
var selfClosing = require('void-elements');
var parseJSExpression = require('character-parser').parseMax;
var constantinople = require('constantinople');

function isConstant(src) {
  return constantinople(src, {jade: runtime, 'jade_interp': undefined});
}
function toConstant(src) {
  return constantinople.toConstant(src, {jade: runtime, 'jade_interp': undefined});
}
function errorAtNode(node, error) {
  error.line = node.line;
  error.filename = node.filename;
  return error;
}

/**
 * Initialize `Compiler` with the given `node`.
 *
 * @param {Node} node
 * @param {Object} options
 * @api public
 */

var Compiler = module.exports = function Compiler(node, options) {
  this.options = options = options || {};
  this.node = node;
  this.hasCompiledDoctype = false;
  this.hasCompiledTag = false;
  this.pp = options.pretty || false;
  if (this.pp && typeof this.pp !== 'string') {
    this.pp = '  ';
  }
  this.debug = false !== options.compileDebug;
  this.indents = 0;
  this.parentIndents = 0;
  this.terse = false;
  this.mixins = {};
  this.dynamicMixins = false;
  if (options.doctype) this.setDoctype(options.doctype);
};

/**
 * Compiler prototype.
 */

Compiler.prototype = {

  /**
   * Compile parse tree to JavaScript.
   *
   * @api public
   */

  compile: function(){
    this.buf = [];
    if (this.pp) this.buf.push("var jade_indent = [];");
    this.lastBufferedIdx = -1;
    this.visit(this.node);
    if (!this.dynamicMixins) {
      // if there are no dynamic mixins we can remove any un-used mixins
      var mixinNames = Object.keys(this.mixins);
      for (var i = 0; i < mixinNames.length; i++) {
        var mixin = this.mixins[mixinNames[i]];
        if (!mixin.used) {
          for (var x = 0; x < mixin.instances.length; x++) {
            for (var y = mixin.instances[x].start; y < mixin.instances[x].end; y++) {
              this.buf[y] = '';
            }
          }
        }
      }
    }
    return this.buf.join('\n');
  },

  /**
   * Sets the default doctype `name`. Sets terse mode to `true` when
   * html 5 is used, causing self-closing tags to end with ">" vs "/>",
   * and boolean attributes are not mirrored.
   *
   * @param {string} name
   * @api public
   */

  setDoctype: function(name){
    this.doctype = doctypes[name.toLowerCase()] || '<!DOCTYPE ' + name + '>';
    this.terse = this.doctype.toLowerCase() == '<!doctype html>';
    this.xml = 0 == this.doctype.indexOf('<?xml');
  },

  /**
   * Buffer the given `str` exactly as is or with interpolation
   *
   * @param {String} str
   * @param {Boolean} interpolate
   * @api public
   */

  buffer: function (str, interpolate) {
    var self = this;
    if (interpolate) {
      var match = /(\\)?([#!]){((?:.|\n)*)$/.exec(str);
      if (match) {
        this.buffer(str.substr(0, match.index), false);
        if (match[1]) { // escape
          this.buffer(match[2] + '{', false);
          this.buffer(match[3], true);
          return;
        } else {
          var rest = match[3];
          var range = parseJSExpression(rest);
          var code = ('!' == match[2] ? '' : 'jade.escape') + "((jade_interp = " + range.src + ") == null ? '' : jade_interp)";
          this.bufferExpression(code);
          this.buffer(rest.substr(range.end + 1), true);
          return;
        }
      }
    }

    str = utils.stringify(str);
    str = str.substr(1, str.length - 2);

    if (this.lastBufferedIdx == this.buf.length) {
      if (this.lastBufferedType === 'code') this.lastBuffered += ' + "';
      this.lastBufferedType = 'text';
      this.lastBuffered += str;
      this.buf[this.lastBufferedIdx - 1] = 'buf.push(' + this.bufferStartChar + this.lastBuffered + '");'
    } else {
      this.buf.push('buf.push("' + str + '");');
      this.lastBufferedType = 'text';
      this.bufferStartChar = '"';
      this.lastBuffered = str;
      this.lastBufferedIdx = this.buf.length;
    }
  },

  /**
   * Buffer the given `src` so it is evaluated at run time
   *
   * @param {String} src
   * @api public
   */

  bufferExpression: function (src) {
    if (isConstant(src)) {
      return this.buffer(toConstant(src) + '', false)
    }
    if (this.lastBufferedIdx == this.buf.length) {
      if (this.lastBufferedType === 'text') this.lastBuffered += '"';
      this.lastBufferedType = 'code';
      this.lastBuffered += ' + (' + src + ')';
      this.buf[this.lastBufferedIdx - 1] = 'buf.push(' + this.bufferStartChar + this.lastBuffered + ');'
    } else {
      this.buf.push('buf.push(' + src + ');');
      this.lastBufferedType = 'code';
      this.bufferStartChar = '';
      this.lastBuffered = '(' + src + ')';
      this.lastBufferedIdx = this.buf.length;
    }
  },

  /**
   * Buffer an indent based on the current `indent`
   * property and an additional `offset`.
   *
   * @param {Number} offset
   * @param {Boolean} newline
   * @api public
   */

  prettyIndent: function(offset, newline){
    offset = offset || 0;
    newline = newline ? '\n' : '';
    this.buffer(newline + Array(this.indents + offset).join(this.pp));
    if (this.parentIndents)
      this.buf.push("buf.push.apply(buf, jade_indent);");
  },

  /**
   * Visit `node`.
   *
   * @param {Node} node
   * @api public
   */

  visit: function(node){
    var debug = this.debug;

    if (debug) {
      this.buf.push('jade_debug.unshift(new jade.DebugItem( ' + node.line
        + ', ' + (node.filename
          ? utils.stringify(node.filename)
          : 'jade_debug[0].filename')
        + ' ));');
    }

    // Massive hack to fix our context
    // stack for - else[ if] etc
    if (false === node.debug && this.debug) {
      this.buf.pop();
      this.buf.pop();
    }

    this.visitNode(node);

    if (debug) this.buf.push('jade_debug.shift();');
  },

  /**
   * Visit `node`.
   *
   * @param {Node} node
   * @api public
   */

  visitNode: function(node){
    return this['visit' + node.type](node);
  },

  /**
   * Visit case `node`.
   *
   * @param {Literal} node
   * @api public
   */

  visitCase: function(node){
    var _ = this.withinCase;
    this.withinCase = true;
    this.buf.push('switch (' + node.expr + '){');
    this.visit(node.block);
    this.buf.push('}');
    this.withinCase = _;
  },

  /**
   * Visit when `node`.
   *
   * @param {Literal} node
   * @api public
   */

  visitWhen: function(node){
    if ('default' == node.expr) {
      this.buf.push('default:');
    } else {
      this.buf.push('case ' + node.expr + ':');
    }
    if (node.block) {
      this.visit(node.block);
      this.buf.push('  break;');
    }
  },

  /**
   * Visit literal `node`.
   *
   * @param {Literal} node
   * @api public
   */

  visitLiteral: function(node){
    this.buffer(node.str);
  },

  /**
   * Visit all nodes in `block`.
   *
   * @param {Block} block
   * @api public
   */

  visitBlock: function(block){
    var len = block.nodes.length
      , escape = this.escape
      , pp = this.pp

    // Pretty print multi-line text
    if (pp && len > 1 && !escape && block.nodes[0].isText && block.nodes[1].isText)
      this.prettyIndent(1, true);

    for (var i = 0; i < len; ++i) {
      // Pretty print text
      if (pp && i > 0 && !escape && block.nodes[i].isText && block.nodes[i-1].isText)
        this.prettyIndent(1, false);

      this.visit(block.nodes[i]);
      // Multiple text nodes are separated by newlines
      if (block.nodes[i+1] && block.nodes[i].isText && block.nodes[i+1].isText)
        this.buffer('\n');
    }
  },

  /**
   * Visit a mixin's `block` keyword.
   *
   * @param {MixinBlock} block
   * @api public
   */

  visitMixinBlock: function(block){
    if (this.pp) this.buf.push("jade_indent.push('" + Array(this.indents + 1).join(this.pp) + "');");
    this.buf.push('block && block();');
    if (this.pp) this.buf.push("jade_indent.pop();");
  },

  /**
   * Visit `doctype`. Sets terse mode to `true` when html 5
   * is used, causing self-closing tags to end with ">" vs "/>",
   * and boolean attributes are not mirrored.
   *
   * @param {Doctype} doctype
   * @api public
   */

  visitDoctype: function(doctype){
    if (doctype && (doctype.val || !this.doctype)) {
      this.setDoctype(doctype.val || 'default');
    }

    if (this.doctype) this.buffer(this.doctype);
    this.hasCompiledDoctype = true;
  },

  /**
   * Visit `mixin`, generating a function that
   * may be called within the template.
   *
   * @param {Mixin} mixin
   * @api public
   */

  visitMixin: function(mixin){
    var name = 'jade_mixins[';
    var args = mixin.args || '';
    var block = mixin.block;
    var attrs = mixin.attrs;
    var attrsBlocks = mixin.attributeBlocks.slice();
    var pp = this.pp;
    var dynamic = mixin.name[0]==='#';
    var key = mixin.name;
    if (dynamic) this.dynamicMixins = true;
    name += (dynamic ? mixin.name.substr(2,mixin.name.length-3):'"'+mixin.name+'"')+']';

    this.mixins[key] = this.mixins[key] || {used: false, instances: []};
    if (mixin.call) {
      this.mixins[key].used = true;
      if (pp) this.buf.push("jade_indent.push('" + Array(this.indents + 1).join(pp) + "');")
      if (block || attrs.length || attrsBlocks.length) {

        this.buf.push(name + '.call({');

        if (block) {
          this.buf.push('block: function(){');

          // Render block with no indents, dynamically added when rendered
          this.parentIndents++;
          var _indents = this.indents;
          this.indents = 0;
          this.visit(mixin.block);
          this.indents = _indents;
          this.parentIndents--;

          if (attrs.length || attrsBlocks.length) {
            this.buf.push('},');
          } else {
            this.buf.push('}');
          }
        }

        if (attrsBlocks.length) {
          if (attrs.length) {
            var val = this.attrs(attrs);
            attrsBlocks.unshift(val);
          }
          this.buf.push('attributes: jade.merge([' + attrsBlocks.join(',') + '])');
        } else if (attrs.length) {
          var val = this.attrs(attrs);
          this.buf.push('attributes: ' + val);
        }

        if (args) {
          this.buf.push('}, ' + args + ');');
        } else {
          this.buf.push('});');
        }

      } else {
        this.buf.push(name + '(' + args + ');');
      }
      if (pp) this.buf.push("jade_indent.pop();")
    } else {
      var mixin_start = this.buf.length;
      args = args ? args.split(',') : [];
      var rest;
      if (args.length && /^\.\.\./.test(args[args.length - 1].trim())) {
        rest = args.pop().trim().replace(/^\.\.\./, '');
      }
      // we need use jade_interp here for v8: https://code.google.com/p/v8/issues/detail?id=4165
      // once fixed, use this: this.buf.push(name + ' = function(' + args.join(',') + '){');
      this.buf.push(name + ' = jade_interp = function(' + args.join(',') + '){');
      this.buf.push('var block = (this && this.block), attributes = (this && this.attributes) || {};');
      if (rest) {
        this.buf.push('var ' + rest + ' = [];');
        this.buf.push('for (jade_interp = ' + args.length + '; jade_interp < arguments.length; jade_interp++) {');
        this.buf.push('  ' + rest + '.push(arguments[jade_interp]);');
        this.buf.push('}');
      }
      this.parentIndents++;
      this.visit(block);
      this.parentIndents--;
      this.buf.push('};');
      var mixin_end = this.buf.length;
      this.mixins[key].instances.push({start: mixin_start, end: mixin_end});
    }
  },

  /**
   * Visit `tag` buffering tag markup, generating
   * attributes, visiting the `tag`'s code and block.
   *
   * @param {Tag} tag
   * @api public
   */

  visitTag: function(tag){
    this.indents++;
    var name = tag.name
      , pp = this.pp
      , self = this;

    function bufferName() {
      if (tag.buffer) self.bufferExpression(name);
      else self.buffer(name);
    }

    if ('pre' == tag.name) this.escape = true;

    if (!this.hasCompiledTag) {
      if (!this.hasCompiledDoctype && 'html' == name) {
        this.visitDoctype();
      }
      this.hasCompiledTag = true;
    }

    // pretty print
    if (pp && !tag.isInline())
      this.prettyIndent(0, true);

    if (tag.selfClosing || (!this.xml && selfClosing[tag.name])) {
      this.buffer('<');
      bufferName();
      this.visitAttributes(tag.attrs, tag.attributeBlocks.slice());
      this.terse
        ? this.buffer('>')
        : this.buffer('/>');
      // if it is non-empty throw an error
      if (tag.block &&
          !(tag.block.type === 'Block' && tag.block.nodes.length === 0) &&
          tag.block.nodes.some(function (tag) {
            return tag.type !== 'Text' || !/^\s*$/.test(tag.val)
          })) {
        throw errorAtNode(tag, new Error(name + ' is self closing and should not have content.'));
      }
    } else {
      // Optimize attributes buffering
      this.buffer('<');
      bufferName();
      this.visitAttributes(tag.attrs, tag.attributeBlocks.slice());
      this.buffer('>');
      if (tag.code) this.visitCode(tag.code);
      this.visit(tag.block);

      // pretty print
      if (pp && !tag.isInline() && 'pre' != tag.name && !tag.canInline())
        this.prettyIndent(0, true);

      this.buffer('</');
      bufferName();
      this.buffer('>');
    }

    if ('pre' == tag.name) this.escape = false;

    this.indents--;
  },

  /**
   * Visit `filter`, throwing when the filter does not exist.
   *
   * @param {Filter} filter
   * @api public
   */

  visitFilter: function(filter){
    var text = filter.block.nodes.map(
      function(node){ return node.val; }
    ).join('\n');
    filter.attrs.filename = this.options.filename;
    try {
      this.buffer(filters(filter.name, text, filter.attrs), true);
    } catch (err) {
      throw errorAtNode(filter, err);
    }
  },

  /**
   * Visit `text` node.
   *
   * @param {Text} text
   * @api public
   */

  visitText: function(text){
    this.buffer(text.val, true);
  },

  /**
   * Visit a `comment`, only buffering when the buffer flag is set.
   *
   * @param {Comment} comment
   * @api public
   */

  visitComment: function(comment){
    if (!comment.buffer) return;
    if (this.pp) this.prettyIndent(1, true);
    this.buffer('<!--' + comment.val + '-->');
  },

  /**
   * Visit a `BlockComment`.
   *
   * @param {Comment} comment
   * @api public
   */

  visitBlockComment: function(comment){
    if (!comment.buffer) return;
    if (this.pp) this.prettyIndent(1, true);
    this.buffer('<!--' + comment.val);
    this.visit(comment.block);
    if (this.pp) this.prettyIndent(1, true);
    this.buffer('-->');
  },

  /**
   * Visit `code`, respecting buffer / escape flags.
   * If the code is followed by a block, wrap it in
   * a self-calling function.
   *
   * @param {Code} code
   * @api public
   */

  visitCode: function(code){
    // Wrap code blocks with {}.
    // we only wrap unbuffered code blocks ATM
    // since they are usually flow control

    // Buffer code
    if (code.buffer) {
      var val = code.val.trim();
      val = 'null == (jade_interp = '+val+') ? "" : jade_interp';
      if (code.escape) val = 'jade.escape(' + val + ')';
      this.bufferExpression(val);
    } else {
      this.buf.push(code.val);
    }

    // Block support
    if (code.block) {
      if (!code.buffer) this.buf.push('{');
      this.visit(code.block);
      if (!code.buffer) this.buf.push('}');
    }
  },

  /**
   * Visit `each` block.
   *
   * @param {Each} each
   * @api public
   */

  visitEach: function(each){
    this.buf.push(''
      + '// iterate ' + each.obj + '\n'
      + ';(function(){\n'
      + '  var $$obj = ' + each.obj + ';\n'
      + '  if (\'number\' == typeof $$obj.length) {\n');

    if (each.alternative) {
      this.buf.push('  if ($$obj.length) {');
    }

    this.buf.push(''
      + '    for (var ' + each.key + ' = 0, $$l = $$obj.length; ' + each.key + ' < $$l; ' + each.key + '++) {\n'
      + '      var ' + each.val + ' = $$obj[' + each.key + '];\n');

    this.visit(each.block);

    this.buf.push('    }\n');

    if (each.alternative) {
      this.buf.push('  } else {');
      this.visit(each.alternative);
      this.buf.push('  }');
    }

    this.buf.push(''
      + '  } else {\n'
      + '    var $$l = 0;\n'
      + '    for (var ' + each.key + ' in $$obj) {\n'
      + '      $$l++;'
      + '      var ' + each.val + ' = $$obj[' + each.key + '];\n');

    this.visit(each.block);

    this.buf.push('    }\n');
    if (each.alternative) {
      this.buf.push('    if ($$l === 0) {');
      this.visit(each.alternative);
      this.buf.push('    }');
    }
    this.buf.push('  }\n}).call(this);\n');
  },

  /**
   * Visit `attrs`.
   *
   * @param {Array} attrs
   * @api public
   */

  visitAttributes: function(attrs, attributeBlocks){
    if (attributeBlocks.length) {
      if (attrs.length) {
        var val = this.attrs(attrs);
        attributeBlocks.unshift(val);
      }
      this.bufferExpression('jade.attrs(jade.merge([' + attributeBlocks.join(',') + ']), ' + utils.stringify(this.terse) + ')');
    } else if (attrs.length) {
      this.attrs(attrs, true);
    }
  },

  /**
   * Compile attributes.
   */

  attrs: function(attrs, buffer){
    var buf = [];
    var classes = [];
    var classEscaping = [];

    attrs.forEach(function(attr){
      var key = attr.name;
      var escaped = attr.escaped;

      if (key === 'class') {
        classes.push(attr.val);
        classEscaping.push(attr.escaped);
      } else if (isConstant(attr.val)) {
        if (buffer) {
          this.buffer(runtime.attr(key, toConstant(attr.val), escaped, this.terse));
        } else {
          var val = toConstant(attr.val);
          if (key === 'style') val = runtime.style(val);
          if (escaped && !(key.indexOf('data') === 0 && typeof val !== 'string')) {
            val = runtime.escape(val);
          }
          buf.push(utils.stringify(key) + ': ' + utils.stringify(val));
        }
      } else {
        if (buffer) {
          this.bufferExpression('jade.attr("' + key + '", ' + attr.val + ', ' + utils.stringify(escaped) + ', ' + utils.stringify(this.terse) + ')');
        } else {
          var val = attr.val;
          if (key === 'style') {
            val = 'jade.style(' + val + ')';
          }
          if (escaped && !(key.indexOf('data') === 0)) {
            val = 'jade.escape(' + val + ')';
          } else if (escaped) {
            val = '(typeof (jade_interp = ' + val + ') == "string" ? jade.escape(jade_interp) : jade_interp)';
          }
          buf.push(utils.stringify(key) + ': ' + val);
        }
      }
    }.bind(this));
    if (buffer) {
      if (classes.every(isConstant)) {
        this.buffer(runtime.cls(classes.map(toConstant), classEscaping));
      } else {
        this.bufferExpression('jade.cls([' + classes.join(',') + '], ' + utils.stringify(classEscaping) + ')');
      }
    } else if (classes.length) {
      if (classes.every(isConstant)) {
        classes = utils.stringify(runtime.joinClasses(classes.map(toConstant).map(runtime.joinClasses).map(function (cls, i) {
          return classEscaping[i] ? runtime.escape(cls) : cls;
        })));
      } else {
        classes = '(jade_interp = ' + utils.stringify(classEscaping) + ',' +
          ' jade.joinClasses([' + classes.join(',') + '].map(jade.joinClasses).map(function (cls, i) {' +
          '   return jade_interp[i] ? jade.escape(cls) : cls' +
          ' }))' +
          ')';
      }
      if (classes.length)
        buf.push('"class": ' + classes);
    }
    return '{' + buf.join(',') + '}';
  }
};

},{"./doctypes":3,"./filters":4,"./nodes":16,"./runtime":24,"./utils":25,"character-parser":29,"constantinople":30,"void-elements":34}],3:[function(require,module,exports){
'use strict';

module.exports = {
    'default': '<!DOCTYPE html>'
  , 'xml': '<?xml version="1.0" encoding="utf-8" ?>'
  , 'transitional': '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">'
  , 'strict': '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">'
  , 'frameset': '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd">'
  , '1.1': '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">'
  , 'basic': '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML Basic 1.1//EN" "http://www.w3.org/TR/xhtml-basic/xhtml-basic11.dtd">'
  , 'mobile': '<!DOCTYPE html PUBLIC "-//WAPFORUM//DTD XHTML Mobile 1.2//EN" "http://www.openmobilealliance.org/tech/DTD/xhtml-mobile12.dtd">'
};
},{}],4:[function(require,module,exports){
'use strict';

module.exports = filter;
function filter(name, str, options) {
  if (typeof filter[name] === 'function') {
    return filter[name](str, options);
  } else {
    throw new Error('unknown filter ":' + name + '"');
  }
}

},{}],5:[function(require,module,exports){
'use strict';

module.exports = [
    'a'
  , 'abbr'
  , 'acronym'
  , 'b'
  , 'br'
  , 'code'
  , 'em'
  , 'font'
  , 'i'
  , 'img'
  , 'ins'
  , 'kbd'
  , 'map'
  , 'samp'
  , 'small'
  , 'span'
  , 'strong'
  , 'sub'
  , 'sup'
];
},{}],6:[function(require,module,exports){
'use strict';

var utils = require('./utils');
var characterParser = require('character-parser');


/**
 * Initialize `Lexer` with the given `str`.
 *
 * @param {String} str
 * @param {String} filename
 * @api private
 */

var Lexer = module.exports = function Lexer(str, filename) {
  this.input = str.replace(/\r\n|\r/g, '\n');
  this.filename = filename;
  this.deferredTokens = [];
  this.lastIndents = 0;
  this.lineno = 1;
  this.stash = [];
  this.indentStack = [];
  this.indentRe = null;
  this.pipeless = false;
};


function assertExpression(exp) {
  //this verifies that a JavaScript expression is valid
  Function('', 'return (' + exp + ')');
}
function assertNestingCorrect(exp) {
  //this verifies that code is properly nested, but allows
  //invalid JavaScript such as the contents of `attributes`
  var res = characterParser(exp)
  if (res.isNesting()) {
    throw new Error('Nesting must match on expression `' + exp + '`')
  }
}

/**
 * Lexer prototype.
 */

Lexer.prototype = {

  /**
   * Construct a token with the given `type` and `val`.
   *
   * @param {String} type
   * @param {String} val
   * @return {Object}
   * @api private
   */

  tok: function(type, val){
    return {
        type: type
      , line: this.lineno
      , val: val
    }
  },

  /**
   * Consume the given `len` of input.
   *
   * @param {Number} len
   * @api private
   */

  consume: function(len){
    this.input = this.input.substr(len);
  },

  /**
   * Scan for `type` with the given `regexp`.
   *
   * @param {String} type
   * @param {RegExp} regexp
   * @return {Object}
   * @api private
   */

  scan: function(regexp, type){
    var captures;
    if (captures = regexp.exec(this.input)) {
      this.consume(captures[0].length);
      return this.tok(type, captures[1]);
    }
  },

  /**
   * Defer the given `tok`.
   *
   * @param {Object} tok
   * @api private
   */

  defer: function(tok){
    this.deferredTokens.push(tok);
  },

  /**
   * Lookahead `n` tokens.
   *
   * @param {Number} n
   * @return {Object}
   * @api private
   */

  lookahead: function(n){
    var fetch = n - this.stash.length;
    while (fetch-- > 0) this.stash.push(this.next());
    return this.stash[--n];
  },

  /**
   * Return the indexOf `(` or `{` or `[` / `)` or `}` or `]` delimiters.
   *
   * @return {Number}
   * @api private
   */

  bracketExpression: function(skip){
    skip = skip || 0;
    var start = this.input[skip];
    if (start != '(' && start != '{' && start != '[') throw new Error('unrecognized start character');
    var end = ({'(': ')', '{': '}', '[': ']'})[start];
    var range = characterParser.parseMax(this.input, {start: skip + 1});
    if (this.input[range.end] !== end) throw new Error('start character ' + start + ' does not match end character ' + this.input[range.end]);
    return range;
  },

  /**
   * Stashed token.
   */

  stashed: function() {
    return this.stash.length
      && this.stash.shift();
  },

  /**
   * Deferred token.
   */

  deferred: function() {
    return this.deferredTokens.length
      && this.deferredTokens.shift();
  },

  /**
   * end-of-source.
   */

  eos: function() {
    if (this.input.length) return;
    if (this.indentStack.length) {
      this.indentStack.shift();
      return this.tok('outdent');
    } else {
      return this.tok('eos');
    }
  },

  /**
   * Blank line.
   */

  blank: function() {
    var captures;
    if (captures = /^\n *\n/.exec(this.input)) {
      this.consume(captures[0].length - 1);
      ++this.lineno;
      if (this.pipeless) return this.tok('text', '');
      return this.next();
    }
  },

  /**
   * Comment.
   */

  comment: function() {
    var captures;
    if (captures = /^\/\/(-)?([^\n]*)/.exec(this.input)) {
      this.consume(captures[0].length);
      var tok = this.tok('comment', captures[2]);
      tok.buffer = '-' != captures[1];
      this.pipeless = true;
      return tok;
    }
  },

  /**
   * Interpolated tag.
   */

  interpolation: function() {
    if (/^#\{/.test(this.input)) {
      var match = this.bracketExpression(1);

      this.consume(match.end + 1);
      return this.tok('interpolation', match.src);
    }
  },

  /**
   * Tag.
   */

  tag: function() {
    var captures;
    if (captures = /^(\w[-:\w]*)(\/?)/.exec(this.input)) {
      this.consume(captures[0].length);
      var tok, name = captures[1];
      if (':' == name[name.length - 1]) {
        name = name.slice(0, -1);
        tok = this.tok('tag', name);
        this.defer(this.tok(':'));
        if (this.input[0] !== ' ') {
          console.warn('Warning: space required after `:` on line ' + this.lineno +
              ' of jade file "' + this.filename + '"');
        }
        while (' ' == this.input[0]) this.input = this.input.substr(1);
      } else {
        tok = this.tok('tag', name);
      }
      tok.selfClosing = !!captures[2];
      return tok;
    }
  },

  /**
   * Filter.
   */

  filter: function() {
    var tok = this.scan(/^:([\w\-]+)/, 'filter');
    if (tok) {
      this.pipeless = true;
      return tok;
    }
  },

  /**
   * Doctype.
   */

  doctype: function() {
    if (this.scan(/^!!! *([^\n]+)?/, 'doctype')) {
      throw new Error('`!!!` is deprecated, you must now use `doctype`');
    }
    var node = this.scan(/^(?:doctype) *([^\n]+)?/, 'doctype');
    if (node && node.val && node.val.trim() === '5') {
      throw new Error('`doctype 5` is deprecated, you must now use `doctype html`');
    }
    return node;
  },

  /**
   * Id.
   */

  id: function() {
    return this.scan(/^#([\w-]+)/, 'id');
  },

  /**
   * Class.
   */

  className: function() {
    return this.scan(/^\.([\w-]+)/, 'class');
  },

  /**
   * Text.
   */

  text: function() {
    return this.scan(/^(?:\| ?| )([^\n]+)/, 'text') ||
      this.scan(/^\|?( )/, 'text') ||
      this.scan(/^(<[^\n]*)/, 'text');
  },

  textFail: function () {
    var tok;
    if (tok = this.scan(/^([^\.\n][^\n]+)/, 'text')) {
      console.warn('Warning: missing space before text for line ' + this.lineno +
          ' of jade file "' + this.filename + '"');
      return tok;
    }
  },

  /**
   * Dot.
   */

  dot: function() {
    var match;
    if (match = this.scan(/^\./, 'dot')) {
      this.pipeless = true;
      return match;
    }
  },

  /**
   * Extends.
   */

  "extends": function() {
    return this.scan(/^extends? +([^\n]+)/, 'extends');
  },

  /**
   * Block prepend.
   */

  prepend: function() {
    var captures;
    if (captures = /^prepend +([^\n]+)/.exec(this.input)) {
      this.consume(captures[0].length);
      var mode = 'prepend'
        , name = captures[1]
        , tok = this.tok('block', name);
      tok.mode = mode;
      return tok;
    }
  },

  /**
   * Block append.
   */

  append: function() {
    var captures;
    if (captures = /^append +([^\n]+)/.exec(this.input)) {
      this.consume(captures[0].length);
      var mode = 'append'
        , name = captures[1]
        , tok = this.tok('block', name);
      tok.mode = mode;
      return tok;
    }
  },

  /**
   * Block.
   */

  block: function() {
    var captures;
    if (captures = /^block\b *(?:(prepend|append) +)?([^\n]+)/.exec(this.input)) {
      this.consume(captures[0].length);
      var mode = captures[1] || 'replace'
        , name = captures[2]
        , tok = this.tok('block', name);

      tok.mode = mode;
      return tok;
    }
  },

  /**
   * Mixin Block.
   */

  mixinBlock: function() {
    var captures;
    if (captures = /^block[ \t]*(\n|$)/.exec(this.input)) {
      this.consume(captures[0].length - captures[1].length);
      return this.tok('mixin-block');
    }
  },

  /**
   * Yield.
   */

  'yield': function() {
    return this.scan(/^yield */, 'yield');
  },

  /**
   * Include.
   */

  include: function() {
    return this.scan(/^include +([^\n]+)/, 'include');
  },

  /**
   * Include with filter
   */

  includeFiltered: function() {
    var captures;
    if (captures = /^include:([\w\-]+)([\( ])/.exec(this.input)) {
      this.consume(captures[0].length - 1);
      var filter = captures[1];
      var attrs = captures[2] === '(' ? this.attrs() : null;
      if (!(captures[2] === ' ' || this.input[0] === ' ')) {
        throw new Error('expected space after include:filter but got ' + utils.stringify(this.input[0]));
      }
      captures = /^ *([^\n]+)/.exec(this.input);
      if (!captures || captures[1].trim() === '') {
        throw new Error('missing path for include:filter');
      }
      this.consume(captures[0].length);
      var path = captures[1];
      var tok = this.tok('include', path);
      tok.filter = filter;
      tok.attrs = attrs;
      return tok;
    }
  },

  /**
   * Case.
   */

  "case": function() {
    return this.scan(/^case +([^\n]+)/, 'case');
  },

  /**
   * When.
   */

  when: function() {
    return this.scan(/^when +([^:\n]+)/, 'when');
  },

  /**
   * Default.
   */

  "default": function() {
    return this.scan(/^default */, 'default');
  },

  /**
   * Call mixin.
   */

  call: function(){

    var tok, captures;
    if (captures = /^\+(\s*)(([-\w]+)|(#\{))/.exec(this.input)) {
      // try to consume simple or interpolated call
      if (captures[3]) {
        // simple call
        this.consume(captures[0].length);
        tok = this.tok('call', captures[3]);
      } else {
        // interpolated call
        var match = this.bracketExpression(2 + captures[1].length);
        this.consume(match.end + 1);
        assertExpression(match.src);
        tok = this.tok('call', '#{'+match.src+'}');
      }

      // Check for args (not attributes)
      if (captures = /^ *\(/.exec(this.input)) {
        var range = this.bracketExpression(captures[0].length - 1);
        if (!/^\s*[-\w]+ *=/.test(range.src)) { // not attributes
          this.consume(range.end + 1);
          tok.args = range.src;
        }
        if (tok.args) {
          assertExpression('[' + tok.args + ']');
        }
      }

      return tok;
    }
  },

  /**
   * Mixin.
   */

  mixin: function(){
    var captures;
    if (captures = /^mixin +([-\w]+)(?: *\((.*)\))? */.exec(this.input)) {
      this.consume(captures[0].length);
      var tok = this.tok('mixin', captures[1]);
      tok.args = captures[2];
      return tok;
    }
  },

  /**
   * Conditional.
   */

  conditional: function() {
    var captures;
    if (captures = /^(if|unless|else if|else)\b([^\n]*)/.exec(this.input)) {
      this.consume(captures[0].length);
      var type = captures[1]
      var js = captures[2];
      var isIf = false;
      var isElse = false;

      switch (type) {
        case 'if':
          assertExpression(js)
          js = 'if (' + js + ')';
          isIf = true;
          break;
        case 'unless':
          assertExpression(js)
          js = 'if (!(' + js + '))';
          isIf = true;
          break;
        case 'else if':
          assertExpression(js)
          js = 'else if (' + js + ')';
          isIf = true;
          isElse = true;
          break;
        case 'else':
          if (js && js.trim()) {
            throw new Error('`else` cannot have a condition, perhaps you meant `else if`');
          }
          js = 'else';
          isElse = true;
          break;
      }
      var tok = this.tok('code', js);
      tok.isElse = isElse;
      tok.isIf = isIf;
      tok.requiresBlock = true;
      return tok;
    }
  },

  /**
   * While.
   */

  "while": function() {
    var captures;
    if (captures = /^while +([^\n]+)/.exec(this.input)) {
      this.consume(captures[0].length);
      assertExpression(captures[1])
      var tok = this.tok('code', 'while (' + captures[1] + ')');
      tok.requiresBlock = true;
      return tok;
    }
  },

  /**
   * Each.
   */

  each: function() {
    var captures;
    if (captures = /^(?:- *)?(?:each|for) +([a-zA-Z_$][\w$]*)(?: *, *([a-zA-Z_$][\w$]*))? * in *([^\n]+)/.exec(this.input)) {
      this.consume(captures[0].length);
      var tok = this.tok('each', captures[1]);
      tok.key = captures[2] || '$index';
      assertExpression(captures[3])
      tok.code = captures[3];
      return tok;
    }
  },

  /**
   * Code.
   */

  code: function() {
    var captures;
    if (captures = /^(!?=|-)[ \t]*([^\n]+)/.exec(this.input)) {
      this.consume(captures[0].length);
      var flags = captures[1];
      captures[1] = captures[2];
      var tok = this.tok('code', captures[1]);
      tok.escape = flags.charAt(0) === '=';
      tok.buffer = flags.charAt(0) === '=' || flags.charAt(1) === '=';
      if (tok.buffer) assertExpression(captures[1])
      return tok;
    }
  },


  /**
   * Block code.
   */

  blockCode: function() {
    var captures;
    if (captures = /^-\n/.exec(this.input)) {
      this.consume(captures[0].length - 1);
      var tok = this.tok('blockCode');
      this.pipeless = true;
      return tok;
    }
  },

  /**
   * Attributes.
   */

  attrs: function() {
    if ('(' == this.input.charAt(0)) {
      var index = this.bracketExpression().end
        , str = this.input.substr(1, index-1)
        , tok = this.tok('attrs');

      assertNestingCorrect(str);

      var quote = '';
      var interpolate = function (attr) {
        return attr.replace(/(\\)?#\{(.+)/g, function(_, escape, expr){
          if (escape) return _;
          try {
            var range = characterParser.parseMax(expr);
            if (expr[range.end] !== '}') return _.substr(0, 2) + interpolate(_.substr(2));
            assertExpression(range.src)
            return quote + " + (" + range.src + ") + " + quote + interpolate(expr.substr(range.end + 1));
          } catch (ex) {
            return _.substr(0, 2) + interpolate(_.substr(2));
          }
        });
      }

      this.consume(index + 1);
      tok.attrs = [];

      var escapedAttr = true
      var key = '';
      var val = '';
      var interpolatable = '';
      var state = characterParser.defaultState();
      var loc = 'key';
      var isEndOfAttribute = function (i) {
        if (key.trim() === '') return false;
        if (i === str.length) return true;
        if (loc === 'key') {
          if (str[i] === ' ' || str[i] === '\n') {
            for (var x = i; x < str.length; x++) {
              if (str[x] != ' ' && str[x] != '\n') {
                if (str[x] === '=' || str[x] === '!' || str[x] === ',') return false;
                else return true;
              }
            }
          }
          return str[i] === ','
        } else if (loc === 'value' && !state.isNesting()) {
          try {
            assertExpression(val);
            if (str[i] === ' ' || str[i] === '\n') {
              for (var x = i; x < str.length; x++) {
                if (str[x] != ' ' && str[x] != '\n') {
                  if (characterParser.isPunctuator(str[x]) && str[x] != '"' && str[x] != "'") return false;
                  else return true;
                }
              }
            }
            return str[i] === ',';
          } catch (ex) {
            return false;
          }
        }
      }

      this.lineno += str.split("\n").length - 1;

      for (var i = 0; i <= str.length; i++) {
        if (isEndOfAttribute(i)) {
          val = val.trim();
          if (val) assertExpression(val)
          key = key.trim();
          key = key.replace(/^['"]|['"]$/g, '');
          tok.attrs.push({
            name: key,
            val: '' == val ? true : val,
            escaped: escapedAttr
          });
          key = val = '';
          loc = 'key';
          escapedAttr = false;
        } else {
          switch (loc) {
            case 'key-char':
              if (str[i] === quote) {
                loc = 'key';
                if (i + 1 < str.length && [' ', ',', '!', '=', '\n'].indexOf(str[i + 1]) === -1)
                  throw new Error('Unexpected character ' + str[i + 1] + ' expected ` `, `\\n`, `,`, `!` or `=`');
              } else {
                key += str[i];
              }
              break;
            case 'key':
              if (key === '' && (str[i] === '"' || str[i] === "'")) {
                loc = 'key-char';
                quote = str[i];
              } else if (str[i] === '!' || str[i] === '=') {
                escapedAttr = str[i] !== '!';
                if (str[i] === '!') i++;
                if (str[i] !== '=') throw new Error('Unexpected character ' + str[i] + ' expected `=`');
                loc = 'value';
                state = characterParser.defaultState();
              } else {
                key += str[i]
              }
              break;
            case 'value':
              state = characterParser.parseChar(str[i], state);
              if (state.isString()) {
                loc = 'string';
                quote = str[i];
                interpolatable = str[i];
              } else {
                val += str[i];
              }
              break;
            case 'string':
              state = characterParser.parseChar(str[i], state);
              interpolatable += str[i];
              if (!state.isString()) {
                loc = 'value';
                val += interpolate(interpolatable);
              }
              break;
          }
        }
      }

      if ('/' == this.input.charAt(0)) {
        this.consume(1);
        tok.selfClosing = true;
      }

      return tok;
    }
  },

  /**
   * &attributes block
   */
  attributesBlock: function () {
    var captures;
    if (/^&attributes\b/.test(this.input)) {
      this.consume(11);
      var args = this.bracketExpression();
      this.consume(args.end + 1);
      return this.tok('&attributes', args.src);
    }
  },

  /**
   * Indent | Outdent | Newline.
   */

  indent: function() {
    var captures, re;

    // established regexp
    if (this.indentRe) {
      captures = this.indentRe.exec(this.input);
    // determine regexp
    } else {
      // tabs
      re = /^\n(\t*) */;
      captures = re.exec(this.input);

      // spaces
      if (captures && !captures[1].length) {
        re = /^\n( *)/;
        captures = re.exec(this.input);
      }

      // established
      if (captures && captures[1].length) this.indentRe = re;
    }

    if (captures) {
      var tok
        , indents = captures[1].length;

      ++this.lineno;
      this.consume(indents + 1);

      if (' ' == this.input[0] || '\t' == this.input[0]) {
        throw new Error('Invalid indentation, you can use tabs or spaces but not both');
      }

      // blank line
      if ('\n' == this.input[0]) {
        this.pipeless = false;
        return this.tok('newline');
      }

      // outdent
      if (this.indentStack.length && indents < this.indentStack[0]) {
        while (this.indentStack.length && this.indentStack[0] > indents) {
          this.stash.push(this.tok('outdent'));
          this.indentStack.shift();
        }
        tok = this.stash.pop();
      // indent
      } else if (indents && indents != this.indentStack[0]) {
        this.indentStack.unshift(indents);
        tok = this.tok('indent', indents);
      // newline
      } else {
        tok = this.tok('newline');
      }

      this.pipeless = false;
      return tok;
    }
  },

  /**
   * Pipe-less text consumed only when
   * pipeless is true;
   */

  pipelessText: function() {
    if (!this.pipeless) return;
    var captures, re;

    // established regexp
    if (this.indentRe) {
      captures = this.indentRe.exec(this.input);
    // determine regexp
    } else {
      // tabs
      re = /^\n(\t*) */;
      captures = re.exec(this.input);

      // spaces
      if (captures && !captures[1].length) {
        re = /^\n( *)/;
        captures = re.exec(this.input);
      }

      // established
      if (captures && captures[1].length) this.indentRe = re;
    }

    var indents = captures && captures[1].length;
    if (indents && (this.indentStack.length === 0 || indents > this.indentStack[0])) {
      var indent = captures[1];
      var line;
      var tokens = [];
      var isMatch;
      do {
        // text has `\n` as a prefix
        var i = this.input.substr(1).indexOf('\n');
        if (-1 == i) i = this.input.length - 1;
        var str = this.input.substr(1, i);
        isMatch = str.substr(0, indent.length) === indent || !str.trim();
        if (isMatch) {
          // consume test along with `\n` prefix if match
          this.consume(str.length + 1);
          ++this.lineno;
          tokens.push(str.substr(indent.length));
        }
      } while(this.input.length && isMatch);
      while (this.input.length === 0 && tokens[tokens.length - 1] === '') tokens.pop();
      return this.tok('pipeless-text', tokens);
    }
  },

  /**
   * ':'
   */

  colon: function() {
    var good = /^: +/.test(this.input);
    var res = this.scan(/^: */, ':');
    if (res && !good) {
      console.warn('Warning: space required after `:` on line ' + this.lineno +
          ' of jade file "' + this.filename + '"');
    }
    return res;
  },

  fail: function () {
    throw new Error('unexpected text ' + this.input.substr(0, 5));
  },

  /**
   * Return the next token object, or those
   * previously stashed by lookahead.
   *
   * @return {Object}
   * @api private
   */

  advance: function(){
    return this.stashed()
      || this.next();
  },

  /**
   * Return the next token object.
   *
   * @return {Object}
   * @api private
   */

  next: function() {
    return this.deferred()
      || this.blank()
      || this.eos()
      || this.pipelessText()
      || this.yield()
      || this.doctype()
      || this.interpolation()
      || this["case"]()
      || this.when()
      || this["default"]()
      || this["extends"]()
      || this.append()
      || this.prepend()
      || this.block()
      || this.mixinBlock()
      || this.include()
      || this.includeFiltered()
      || this.mixin()
      || this.call()
      || this.conditional()
      || this.each()
      || this["while"]()
      || this.tag()
      || this.filter()
      || this.blockCode()
      || this.code()
      || this.id()
      || this.className()
      || this.attrs()
      || this.attributesBlock()
      || this.indent()
      || this.text()
      || this.comment()
      || this.colon()
      || this.dot()
      || this.textFail()
      || this.fail();
  }
};

},{"./utils":25,"character-parser":29}],7:[function(require,module,exports){
'use strict';

var Node = require('./node');

/**
 * Initialize a `Attrs` node.
 *
 * @api public
 */

var Attrs = module.exports = function Attrs() {
  this.attributeNames = [];
  this.attrs = [];
  this.attributeBlocks = [];
};

// Inherit from `Node`.
Attrs.prototype = Object.create(Node.prototype);
Attrs.prototype.constructor = Attrs;

Attrs.prototype.type = 'Attrs';

/**
 * Set attribute `name` to `val`, keep in mind these become
 * part of a raw js object literal, so to quote a value you must
 * '"quote me"', otherwise or example 'user.name' is literal JavaScript.
 *
 * @param {String} name
 * @param {String} val
 * @param {Boolean} escaped
 * @return {Tag} for chaining
 * @api public
 */

Attrs.prototype.setAttribute = function(name, val, escaped){
  if (name !== 'class' && this.attributeNames.indexOf(name) !== -1) {
    throw new Error('Duplicate attribute "' + name + '" is not allowed.');
  }
  this.attributeNames.push(name);
  this.attrs.push({ name: name, val: val, escaped: escaped });
  return this;
};

/**
 * Remove attribute `name` when present.
 *
 * @param {String} name
 * @api public
 */

Attrs.prototype.removeAttribute = function(name){
  var err = new Error('attrs.removeAttribute is deprecated and will be removed in v2.0.0');
  console.warn(err.stack);

  for (var i = 0, len = this.attrs.length; i < len; ++i) {
    if (this.attrs[i] && this.attrs[i].name == name) {
      delete this.attrs[i];
    }
  }
};

/**
 * Get attribute value by `name`.
 *
 * @param {String} name
 * @return {String}
 * @api public
 */

Attrs.prototype.getAttribute = function(name){
  var err = new Error('attrs.getAttribute is deprecated and will be removed in v2.0.0');
  console.warn(err.stack);

  for (var i = 0, len = this.attrs.length; i < len; ++i) {
    if (this.attrs[i] && this.attrs[i].name == name) {
      return this.attrs[i].val;
    }
  }
};

Attrs.prototype.addAttributes = function (src) {
  this.attributeBlocks.push(src);
};

},{"./node":20}],8:[function(require,module,exports){
'use strict';

var Node = require('./node');

/**
 * Initialize a `BlockComment` with the given `block`.
 *
 * @param {String} val
 * @param {Block} block
 * @param {Boolean} buffer
 * @api public
 */

var BlockComment = module.exports = function BlockComment(val, block, buffer) {
  this.block = block;
  this.val = val;
  this.buffer = buffer;
};

// Inherit from `Node`.
BlockComment.prototype = Object.create(Node.prototype);
BlockComment.prototype.constructor = BlockComment;

BlockComment.prototype.type = 'BlockComment';

},{"./node":20}],9:[function(require,module,exports){
'use strict';

var Node = require('./node');

/**
 * Initialize a new `Block` with an optional `node`.
 *
 * @param {Node} node
 * @api public
 */

var Block = module.exports = function Block(node){
  this.nodes = [];
  if (node) this.push(node);
};

// Inherit from `Node`.
Block.prototype = Object.create(Node.prototype);
Block.prototype.constructor = Block;

Block.prototype.type = 'Block';

/**
 * Block flag.
 */

Block.prototype.isBlock = true;

/**
 * Replace the nodes in `other` with the nodes
 * in `this` block.
 *
 * @param {Block} other
 * @api private
 */

Block.prototype.replace = function(other){
  var err = new Error('block.replace is deprecated and will be removed in v2.0.0');
  console.warn(err.stack);

  other.nodes = this.nodes;
};

/**
 * Push the given `node`.
 *
 * @param {Node} node
 * @return {Number}
 * @api public
 */

Block.prototype.push = function(node){
  return this.nodes.push(node);
};

/**
 * Check if this block is empty.
 *
 * @return {Boolean}
 * @api public
 */

Block.prototype.isEmpty = function(){
  return 0 == this.nodes.length;
};

/**
 * Unshift the given `node`.
 *
 * @param {Node} node
 * @return {Number}
 * @api public
 */

Block.prototype.unshift = function(node){
  return this.nodes.unshift(node);
};

/**
 * Return the "last" block, or the first `yield` node.
 *
 * @return {Block}
 * @api private
 */

Block.prototype.includeBlock = function(){
  var ret = this
    , node;

  for (var i = 0, len = this.nodes.length; i < len; ++i) {
    node = this.nodes[i];
    if (node.yield) return node;
    else if (node.textOnly) continue;
    else if (node.includeBlock) ret = node.includeBlock();
    else if (node.block && !node.block.isEmpty()) ret = node.block.includeBlock();
    if (ret.yield) return ret;
  }

  return ret;
};

/**
 * Return a clone of this block.
 *
 * @return {Block}
 * @api private
 */

Block.prototype.clone = function(){
  var err = new Error('block.clone is deprecated and will be removed in v2.0.0');
  console.warn(err.stack);

  var clone = new Block;
  for (var i = 0, len = this.nodes.length; i < len; ++i) {
    clone.push(this.nodes[i].clone());
  }
  return clone;
};

},{"./node":20}],10:[function(require,module,exports){
'use strict';

var Node = require('./node');

/**
 * Initialize a new `Case` with `expr`.
 *
 * @param {String} expr
 * @api public
 */

var Case = exports = module.exports = function Case(expr, block){
  this.expr = expr;
  this.block = block;
};

// Inherit from `Node`.
Case.prototype = Object.create(Node.prototype);
Case.prototype.constructor = Case;

Case.prototype.type = 'Case';

var When = exports.When = function When(expr, block){
  this.expr = expr;
  this.block = block;
  this.debug = false;
};

// Inherit from `Node`.
When.prototype = Object.create(Node.prototype);
When.prototype.constructor = When;

When.prototype.type = 'When';

},{"./node":20}],11:[function(require,module,exports){
'use strict';

var Node = require('./node');

/**
 * Initialize a `Code` node with the given code `val`.
 * Code may also be optionally buffered and escaped.
 *
 * @param {String} val
 * @param {Boolean} buffer
 * @param {Boolean} escape
 * @api public
 */

var Code = module.exports = function Code(val, buffer, escape) {
  this.val = val;
  this.buffer = buffer;
  this.escape = escape;
  if (val.match(/^ *else/)) this.debug = false;
};

// Inherit from `Node`.
Code.prototype = Object.create(Node.prototype);
Code.prototype.constructor = Code;

Code.prototype.type = 'Code'; // prevent the minifiers removing this
},{"./node":20}],12:[function(require,module,exports){
'use strict';

var Node = require('./node');

/**
 * Initialize a `Comment` with the given `val`, optionally `buffer`,
 * otherwise the comment may render in the output.
 *
 * @param {String} val
 * @param {Boolean} buffer
 * @api public
 */

var Comment = module.exports = function Comment(val, buffer) {
  this.val = val;
  this.buffer = buffer;
};

// Inherit from `Node`.
Comment.prototype = Object.create(Node.prototype);
Comment.prototype.constructor = Comment;

Comment.prototype.type = 'Comment';

},{"./node":20}],13:[function(require,module,exports){
'use strict';

var Node = require('./node');

/**
 * Initialize a `Doctype` with the given `val`. 
 *
 * @param {String} val
 * @api public
 */

var Doctype = module.exports = function Doctype(val) {
  this.val = val;
};

// Inherit from `Node`.
Doctype.prototype = Object.create(Node.prototype);
Doctype.prototype.constructor = Doctype;

Doctype.prototype.type = 'Doctype';

},{"./node":20}],14:[function(require,module,exports){
'use strict';

var Node = require('./node');

/**
 * Initialize an `Each` node, representing iteration
 *
 * @param {String} obj
 * @param {String} val
 * @param {String} key
 * @param {Block} block
 * @api public
 */

var Each = module.exports = function Each(obj, val, key, block) {
  this.obj = obj;
  this.val = val;
  this.key = key;
  this.block = block;
};

// Inherit from `Node`.
Each.prototype = Object.create(Node.prototype);
Each.prototype.constructor = Each;

Each.prototype.type = 'Each';

},{"./node":20}],15:[function(require,module,exports){
'use strict';

var Node = require('./node');

/**
 * Initialize a `Filter` node with the given
 * filter `name` and `block`.
 *
 * @param {String} name
 * @param {Block|Node} block
 * @api public
 */

var Filter = module.exports = function Filter(name, block, attrs) {
  this.name = name;
  this.block = block;
  this.attrs = attrs;
};

// Inherit from `Node`.
Filter.prototype = Object.create(Node.prototype);
Filter.prototype.constructor = Filter;

Filter.prototype.type = 'Filter';

},{"./node":20}],16:[function(require,module,exports){
'use strict';

exports.Node = require('./node');
exports.Tag = require('./tag');
exports.Code = require('./code');
exports.Each = require('./each');
exports.Case = require('./case');
exports.Text = require('./text');
exports.Block = require('./block');
exports.MixinBlock = require('./mixin-block');
exports.Mixin = require('./mixin');
exports.Filter = require('./filter');
exports.Comment = require('./comment');
exports.Literal = require('./literal');
exports.BlockComment = require('./block-comment');
exports.Doctype = require('./doctype');

},{"./block":9,"./block-comment":8,"./case":10,"./code":11,"./comment":12,"./doctype":13,"./each":14,"./filter":15,"./literal":17,"./mixin":19,"./mixin-block":18,"./node":20,"./tag":21,"./text":22}],17:[function(require,module,exports){
'use strict';

var Node = require('./node');

/**
 * Initialize a `Literal` node with the given `str.
 *
 * @param {String} str
 * @api public
 */

var Literal = module.exports = function Literal(str) {
  this.str = str;
};

// Inherit from `Node`.
Literal.prototype = Object.create(Node.prototype);
Literal.prototype.constructor = Literal;

Literal.prototype.type = 'Literal';

},{"./node":20}],18:[function(require,module,exports){
'use strict';

var Node = require('./node');

/**
 * Initialize a new `Block` with an optional `node`.
 *
 * @param {Node} node
 * @api public
 */

var MixinBlock = module.exports = function MixinBlock(){};

// Inherit from `Node`.
MixinBlock.prototype = Object.create(Node.prototype);
MixinBlock.prototype.constructor = MixinBlock;

MixinBlock.prototype.type = 'MixinBlock';

},{"./node":20}],19:[function(require,module,exports){
'use strict';

var Attrs = require('./attrs');

/**
 * Initialize a new `Mixin` with `name` and `block`.
 *
 * @param {String} name
 * @param {String} args
 * @param {Block} block
 * @api public
 */

var Mixin = module.exports = function Mixin(name, args, block, call){
  Attrs.call(this);
  this.name = name;
  this.args = args;
  this.block = block;
  this.call = call;
};

// Inherit from `Attrs`.
Mixin.prototype = Object.create(Attrs.prototype);
Mixin.prototype.constructor = Mixin;

Mixin.prototype.type = 'Mixin';

},{"./attrs":7}],20:[function(require,module,exports){
'use strict';

var Node = module.exports = function Node(){};

/**
 * Clone this node (return itself)
 *
 * @return {Node}
 * @api private
 */

Node.prototype.clone = function(){
  var err = new Error('node.clone is deprecated and will be removed in v2.0.0');
  console.warn(err.stack);
  return this;
};

Node.prototype.type = '';

},{}],21:[function(require,module,exports){
'use strict';

var Attrs = require('./attrs');
var Block = require('./block');
var inlineTags = require('../inline-tags');

/**
 * Initialize a `Tag` node with the given tag `name` and optional `block`.
 *
 * @param {String} name
 * @param {Block} block
 * @api public
 */

var Tag = module.exports = function Tag(name, block) {
  Attrs.call(this);
  this.name = name;
  this.block = block || new Block;
};

// Inherit from `Attrs`.
Tag.prototype = Object.create(Attrs.prototype);
Tag.prototype.constructor = Tag;

Tag.prototype.type = 'Tag';

/**
 * Clone this tag.
 *
 * @return {Tag}
 * @api private
 */

Tag.prototype.clone = function(){
  var err = new Error('tag.clone is deprecated and will be removed in v2.0.0');
  console.warn(err.stack);

  var clone = new Tag(this.name, this.block.clone());
  clone.line = this.line;
  clone.attrs = this.attrs;
  clone.textOnly = this.textOnly;
  return clone;
};

/**
 * Check if this tag is an inline tag.
 *
 * @return {Boolean}
 * @api private
 */

Tag.prototype.isInline = function(){
  return ~inlineTags.indexOf(this.name);
};

/**
 * Check if this tag's contents can be inlined.  Used for pretty printing.
 *
 * @return {Boolean}
 * @api private
 */

Tag.prototype.canInline = function(){
  var nodes = this.block.nodes;

  function isInline(node){
    // Recurse if the node is a block
    if (node.isBlock) return node.nodes.every(isInline);
    return node.isText || (node.isInline && node.isInline());
  }

  // Empty tag
  if (!nodes.length) return true;

  // Text-only or inline-only tag
  if (1 == nodes.length) return isInline(nodes[0]);

  // Multi-line inline-only tag
  if (this.block.nodes.every(isInline)) {
    for (var i = 1, len = nodes.length; i < len; ++i) {
      if (nodes[i-1].isText && nodes[i].isText)
        return false;
    }
    return true;
  }

  // Mixed tag
  return false;
};

},{"../inline-tags":5,"./attrs":7,"./block":9}],22:[function(require,module,exports){
'use strict';

var Node = require('./node');

/**
 * Initialize a `Text` node with optional `line`.
 *
 * @param {String} line
 * @api public
 */

var Text = module.exports = function Text(line) {
  this.val = line;
};

// Inherit from `Node`.
Text.prototype = Object.create(Node.prototype);
Text.prototype.constructor = Text;

Text.prototype.type = 'Text';

/**
 * Flag as text.
 */

Text.prototype.isText = true;
},{"./node":20}],23:[function(require,module,exports){
'use strict';

var Lexer = require('./lexer');
var nodes = require('./nodes');
var utils = require('./utils');
var filters = require('./filters');
var path = require('path');
var constantinople = require('constantinople');
var parseJSExpression = require('character-parser').parseMax;
var extname = path.extname;

/**
 * Initialize `Parser` with the given input `str` and `filename`.
 *
 * @param {String} str
 * @param {String} filename
 * @param {Object} options
 * @api public
 */

var Parser = exports = module.exports = function Parser(str, filename, options){
  //Strip any UTF-8 BOM off of the start of `str`, if it exists.
  this.input = str.replace(/^\uFEFF/, '');
  this.lexer = new Lexer(this.input, filename);
  this.filename = filename;
  this.blocks = {};
  this.mixins = {};
  this.options = options;
  this.contexts = [this];
  this.inMixin = 0;
  this.dependencies = [];
  this.inBlock = 0;
};

/**
 * Parser prototype.
 */

Parser.prototype = {

  /**
   * Save original constructor
   */

  constructor: Parser,

  /**
   * Push `parser` onto the context stack,
   * or pop and return a `Parser`.
   */

  context: function(parser){
    if (parser) {
      this.contexts.push(parser);
    } else {
      return this.contexts.pop();
    }
  },

  /**
   * Return the next token object.
   *
   * @return {Object}
   * @api private
   */

  advance: function(){
    return this.lexer.advance();
  },

  /**
   * Single token lookahead.
   *
   * @return {Object}
   * @api private
   */

  peek: function() {
    return this.lookahead(1);
  },

  /**
   * Return lexer lineno.
   *
   * @return {Number}
   * @api private
   */

  line: function() {
    return this.lexer.lineno;
  },

  /**
   * `n` token lookahead.
   *
   * @param {Number} n
   * @return {Object}
   * @api private
   */

  lookahead: function(n){
    return this.lexer.lookahead(n);
  },

  /**
   * Parse input returning a string of js for evaluation.
   *
   * @return {String}
   * @api public
   */

  parse: function(){
    var block = new nodes.Block, parser;
    block.line = 0;
    block.filename = this.filename;

    while ('eos' != this.peek().type) {
      if ('newline' == this.peek().type) {
        this.advance();
      } else {
        var next = this.peek();
        var expr = this.parseExpr();
        expr.filename = expr.filename || this.filename;
        expr.line = next.line;
        block.push(expr);
      }
    }

    if (parser = this.extending) {
      this.context(parser);
      var ast = parser.parse();
      this.context();

      // hoist mixins
      for (var name in this.mixins)
        ast.unshift(this.mixins[name]);
      return ast;
    }

    if (!this.extending && !this.included && Object.keys(this.blocks).length){
      var blocks = [];
      utils.walkAST(block, function (node) {
        if (node.type === 'Block' && node.name) {
          blocks.push(node.name);
        }
      });
      Object.keys(this.blocks).forEach(function (name) {
        if (blocks.indexOf(name) === -1 && !this.blocks[name].isSubBlock) {
          console.warn('Warning: Unexpected block "'
                       + name
                       + '" '
                       + ' on line '
                       + this.blocks[name].line
                       + ' of '
                       + (this.blocks[name].filename)
                       + '. This block is never used. This warning will be an error in v2.0.0');
        }
      }.bind(this));
    }

    return block;
  },

  /**
   * Expect the given type, or throw an exception.
   *
   * @param {String} type
   * @api private
   */

  expect: function(type){
    if (this.peek().type === type) {
      return this.advance();
    } else {
      throw new Error('expected "' + type + '", but got "' + this.peek().type + '"');
    }
  },

  /**
   * Accept the given `type`.
   *
   * @param {String} type
   * @api private
   */

  accept: function(type){
    if (this.peek().type === type) {
      return this.advance();
    }
  },

  /**
   *   tag
   * | doctype
   * | mixin
   * | include
   * | filter
   * | comment
   * | text
   * | each
   * | code
   * | yield
   * | id
   * | class
   * | interpolation
   */

  parseExpr: function(){
    switch (this.peek().type) {
      case 'tag':
        return this.parseTag();
      case 'mixin':
        return this.parseMixin();
      case 'block':
        return this.parseBlock();
      case 'mixin-block':
        return this.parseMixinBlock();
      case 'case':
        return this.parseCase();
      case 'extends':
        return this.parseExtends();
      case 'include':
        return this.parseInclude();
      case 'doctype':
        return this.parseDoctype();
      case 'filter':
        return this.parseFilter();
      case 'comment':
        return this.parseComment();
      case 'text':
        return this.parseText();
      case 'each':
        return this.parseEach();
      case 'code':
        return this.parseCode();
      case 'blockCode':
        return this.parseBlockCode();
      case 'call':
        return this.parseCall();
      case 'interpolation':
        return this.parseInterpolation();
      case 'yield':
        this.advance();
        var block = new nodes.Block;
        block.yield = true;
        return block;
      case 'id':
      case 'class':
        var tok = this.advance();
        this.lexer.defer(this.lexer.tok('tag', 'div'));
        this.lexer.defer(tok);
        return this.parseExpr();
      default:
        throw new Error('unexpected token "' + this.peek().type + '"');
    }
  },

  /**
   * Text
   */

  parseText: function(){
    var tok = this.expect('text');
    var tokens = this.parseInlineTagsInText(tok.val);
    if (tokens.length === 1) return tokens[0];
    var node = new nodes.Block;
    for (var i = 0; i < tokens.length; i++) {
      node.push(tokens[i]);
    };
    return node;
  },

  /**
   *   ':' expr
   * | block
   */

  parseBlockExpansion: function(){
    if (':' == this.peek().type) {
      this.advance();
      return new nodes.Block(this.parseExpr());
    } else {
      return this.block();
    }
  },

  /**
   * case
   */

  parseCase: function(){
    var val = this.expect('case').val;
    var node = new nodes.Case(val);
    node.line = this.line();

    var block = new nodes.Block;
    block.line = this.line();
    block.filename = this.filename;
    this.expect('indent');
    while ('outdent' != this.peek().type) {
      switch (this.peek().type) {
        case 'comment':
        case 'newline':
          this.advance();
          break;
        case 'when':
          block.push(this.parseWhen());
          break;
        case 'default':
          block.push(this.parseDefault());
          break;
        default:
          throw new Error('Unexpected token "' + this.peek().type
                          + '", expected "when", "default" or "newline"');
      }
    }
    this.expect('outdent');

    node.block = block;

    return node;
  },

  /**
   * when
   */

  parseWhen: function(){
    var val = this.expect('when').val;
    if (this.peek().type !== 'newline')
      return new nodes.Case.When(val, this.parseBlockExpansion());
    else
      return new nodes.Case.When(val);
  },

  /**
   * default
   */

  parseDefault: function(){
    this.expect('default');
    return new nodes.Case.When('default', this.parseBlockExpansion());
  },

  /**
   * code
   */

  parseCode: function(afterIf){
    var tok = this.expect('code');
    var node = new nodes.Code(tok.val, tok.buffer, tok.escape);
    var block;
    node.line = this.line();

    // throw an error if an else does not have an if
    if (tok.isElse && !tok.hasIf) {
      throw new Error('Unexpected else without if');
    }

    // handle block
    block = 'indent' == this.peek().type;
    if (block) {
      node.block = this.block();
    }

    // handle missing block
    if (tok.requiresBlock && !block) {
      node.block = new nodes.Block();
    }

    // mark presense of if for future elses
    if (tok.isIf && this.peek().isElse) {
      this.peek().hasIf = true;
    } else if (tok.isIf && this.peek().type === 'newline' && this.lookahead(2).isElse) {
      this.lookahead(2).hasIf = true;
    }

    return node;
  },

  /**
   * block code
   */

  parseBlockCode: function(){
    var tok = this.expect('blockCode');
    var node;
    var body = this.peek();
    var text;
    if (body.type === 'pipeless-text') {
      this.advance();
      text = body.val.join('\n');
    } else {
      text = '';
    }
      node = new nodes.Code(text, false, false);
      return node;
  },

  /**
   * comment
   */

  parseComment: function(){
    var tok = this.expect('comment');
    var node;

    var block;
    if (block = this.parseTextBlock()) {
      node = new nodes.BlockComment(tok.val, block, tok.buffer);
    } else {
      node = new nodes.Comment(tok.val, tok.buffer);
    }

    node.line = this.line();
    return node;
  },

  /**
   * doctype
   */

  parseDoctype: function(){
    var tok = this.expect('doctype');
    var node = new nodes.Doctype(tok.val);
    node.line = this.line();
    return node;
  },

  /**
   * filter attrs? text-block
   */

  parseFilter: function(){
    var tok = this.expect('filter');
    var attrs = this.accept('attrs');
    var block;

    block = this.parseTextBlock() || new nodes.Block();

    var options = {};
    if (attrs) {
      attrs.attrs.forEach(function (attribute) {
        options[attribute.name] = constantinople.toConstant(attribute.val);
      });
    }

    var node = new nodes.Filter(tok.val, block, options);
    node.line = this.line();
    return node;
  },

  /**
   * each block
   */

  parseEach: function(){
    var tok = this.expect('each');
    var node = new nodes.Each(tok.code, tok.val, tok.key);
    node.line = this.line();
    node.block = this.block();
    if (this.peek().type == 'code' && this.peek().val == 'else') {
      this.advance();
      node.alternative = this.block();
    }
    return node;
  },

  /**
   * Resolves a path relative to the template for use in
   * includes and extends
   *
   * @param {String}  path
   * @param {String}  purpose  Used in error messages.
   * @return {String}
   * @api private
   */

  resolvePath: function (path, purpose) {
    var p = require('path');
    var dirname = p.dirname;
    var basename = p.basename;
    var join = p.join;

    if (path[0] !== '/' && !this.filename)
      throw new Error('the "filename" option is required to use "' + purpose + '" with "relative" paths');

    if (path[0] === '/' && !this.options.basedir)
      throw new Error('the "basedir" option is required to use "' + purpose + '" with "absolute" paths');

    path = join(path[0] === '/' ? this.options.basedir : dirname(this.filename), path);

    if (basename(path).indexOf('.') === -1) path += '.jade';

    return path;
  },

  /**
   * 'extends' name
   */

  parseExtends: function(){
    var fs = require('fs');

    var path = this.resolvePath(this.expect('extends').val.trim(), 'extends');
    if ('.jade' != path.substr(-5)) path += '.jade';

    this.dependencies.push(path);
    var str = fs.readFileSync(path, 'utf8');
    var parser = new this.constructor(str, path, this.options);
    parser.dependencies = this.dependencies;

    parser.blocks = this.blocks;
    parser.included = this.included;
    parser.contexts = this.contexts;
    this.extending = parser;

    // TODO: null node
    return new nodes.Literal('');
  },

  /**
   * 'block' name block
   */

  parseBlock: function(){
    var block = this.expect('block');
    var mode = block.mode;
    var name = block.val.trim();

    var line = block.line;

    this.inBlock++;
    block = 'indent' == this.peek().type
      ? this.block()
      : new nodes.Block(new nodes.Literal(''));
    this.inBlock--;
    block.name = name;
    block.line = line;

    var prev = this.blocks[name] || {prepended: [], appended: []}
    if (prev.mode === 'replace') return this.blocks[name] = prev;

    var allNodes = prev.prepended.concat(block.nodes).concat(prev.appended);

    switch (mode) {
      case 'append':
        prev.appended = prev.parser === this ?
                        prev.appended.concat(block.nodes) :
                        block.nodes.concat(prev.appended);
        break;
      case 'prepend':
        prev.prepended = prev.parser === this ?
                         block.nodes.concat(prev.prepended) :
                         prev.prepended.concat(block.nodes);
        break;
    }
    block.nodes = allNodes;
    block.appended = prev.appended;
    block.prepended = prev.prepended;
    block.mode = mode;
    block.parser = this;

    block.isSubBlock = this.inBlock > 0;

    return this.blocks[name] = block;
  },

  parseMixinBlock: function () {
    var block = this.expect('mixin-block');
    if (!this.inMixin) {
      throw new Error('Anonymous blocks are not allowed unless they are part of a mixin.');
    }
    return new nodes.MixinBlock();
  },

  /**
   * include block?
   */

  parseInclude: function(){
    var fs = require('fs');
    var tok = this.expect('include');

    var path = this.resolvePath(tok.val.trim(), 'include');
    this.dependencies.push(path);
    // has-filter
    if (tok.filter) {
      var str = fs.readFileSync(path, 'utf8').replace(/\r/g, '');
      var options = {filename: path};
      if (tok.attrs) {
        tok.attrs.attrs.forEach(function (attribute) {
          options[attribute.name] = constantinople.toConstant(attribute.val);
        });
      }
      str = filters(tok.filter, str, options);
      return new nodes.Literal(str);
    }

    // non-jade
    if ('.jade' != path.substr(-5)) {
      var str = fs.readFileSync(path, 'utf8').replace(/\r/g, '');
      return new nodes.Literal(str);
    }

    var str = fs.readFileSync(path, 'utf8');
    var parser = new this.constructor(str, path, this.options);
    parser.dependencies = this.dependencies;

    parser.blocks = utils.merge({}, this.blocks);
    parser.included = true;

    parser.mixins = this.mixins;

    this.context(parser);
    var ast = parser.parse();
    this.context();
    ast.filename = path;

    if ('indent' == this.peek().type) {
      ast.includeBlock().push(this.block());
    }

    return ast;
  },

  /**
   * call ident block
   */

  parseCall: function(){
    var tok = this.expect('call');
    var name = tok.val;
    var args = tok.args;
    var mixin = new nodes.Mixin(name, args, new nodes.Block, true);

    this.tag(mixin);
    if (mixin.code) {
      mixin.block.push(mixin.code);
      mixin.code = null;
    }
    if (mixin.block.isEmpty()) mixin.block = null;
    return mixin;
  },

  /**
   * mixin block
   */

  parseMixin: function(){
    var tok = this.expect('mixin');
    var name = tok.val;
    var args = tok.args;
    var mixin;

    // definition
    if ('indent' == this.peek().type) {
      this.inMixin++;
      mixin = new nodes.Mixin(name, args, this.block(), false);
      this.mixins[name] = mixin;
      this.inMixin--;
      return mixin;
    // call
    } else {
      return new nodes.Mixin(name, args, null, true);
    }
  },

  parseInlineTagsInText: function (str) {
    var line = this.line();

    var match = /(\\)?#\[((?:.|\n)*)$/.exec(str);
    if (match) {
      if (match[1]) { // escape
        var text = new nodes.Text(str.substr(0, match.index) + '#[');
        text.line = line;
        var rest = this.parseInlineTagsInText(match[2]);
        if (rest[0].type === 'Text') {
          text.val += rest[0].val;
          rest.shift();
        }
        return [text].concat(rest);
      } else {
        var text = new nodes.Text(str.substr(0, match.index));
        text.line = line;
        var buffer = [text];
        var rest = match[2];
        var range = parseJSExpression(rest);
        var inner = new Parser(range.src, this.filename, this.options);
        buffer.push(inner.parse());
        return buffer.concat(this.parseInlineTagsInText(rest.substr(range.end + 1)));
      }
    } else {
      var text = new nodes.Text(str);
      text.line = line;
      return [text];
    }
  },

  /**
   * indent (text | newline)* outdent
   */

  parseTextBlock: function(){
    var block = new nodes.Block;
    block.line = this.line();
    var body = this.peek();
    if (body.type !== 'pipeless-text') return;
    this.advance();
    block.nodes = body.val.reduce(function (accumulator, text) {
      return accumulator.concat(this.parseInlineTagsInText(text));
    }.bind(this), []);
    return block;
  },

  /**
   * indent expr* outdent
   */

  block: function(){
    var block = new nodes.Block;
    block.line = this.line();
    block.filename = this.filename;
    this.expect('indent');
    while ('outdent' != this.peek().type) {
      if ('newline' == this.peek().type) {
        this.advance();
      } else {
        var expr = this.parseExpr();
        expr.filename = this.filename;
        block.push(expr);
      }
    }
    this.expect('outdent');
    return block;
  },

  /**
   * interpolation (attrs | class | id)* (text | code | ':')? newline* block?
   */

  parseInterpolation: function(){
    var tok = this.advance();
    var tag = new nodes.Tag(tok.val);
    tag.buffer = true;
    return this.tag(tag);
  },

  /**
   * tag (attrs | class | id)* (text | code | ':')? newline* block?
   */

  parseTag: function(){
    var tok = this.advance();
    var tag = new nodes.Tag(tok.val);

    tag.selfClosing = tok.selfClosing;

    return this.tag(tag);
  },

  /**
   * Parse tag.
   */

  tag: function(tag){
    tag.line = this.line();

    var seenAttrs = false;
    // (attrs | class | id)*
    out:
      while (true) {
        switch (this.peek().type) {
          case 'id':
          case 'class':
            var tok = this.advance();
            tag.setAttribute(tok.type, "'" + tok.val + "'");
            continue;
          case 'attrs':
            if (seenAttrs) {
              console.warn(this.filename + ', line ' + this.peek().line + ':\nYou should not have jade tags with multiple attributes.');
            }
            seenAttrs = true;
            var tok = this.advance();
            var attrs = tok.attrs;

            if (tok.selfClosing) tag.selfClosing = true;

            for (var i = 0; i < attrs.length; i++) {
              tag.setAttribute(attrs[i].name, attrs[i].val, attrs[i].escaped);
            }
            continue;
          case '&attributes':
            var tok = this.advance();
            tag.addAttributes(tok.val);
            break;
          default:
            break out;
        }
      }

    // check immediate '.'
    if ('dot' == this.peek().type) {
      tag.textOnly = true;
      this.advance();
    }

    // (text | code | ':')?
    switch (this.peek().type) {
      case 'text':
        tag.block.push(this.parseText());
        break;
      case 'code':
        tag.code = this.parseCode();
        break;
      case ':':
        this.advance();
        tag.block = new nodes.Block;
        tag.block.push(this.parseExpr());
        break;
      case 'newline':
      case 'indent':
      case 'outdent':
      case 'eos':
      case 'pipeless-text':
        break;
      default:
        throw new Error('Unexpected token `' + this.peek().type + '` expected `text`, `code`, `:`, `newline` or `eos`')
    }

    // newline*
    while ('newline' == this.peek().type) this.advance();

    // block?
    if (tag.textOnly) {
      tag.block = this.parseTextBlock() || new nodes.Block();
    } else if ('indent' == this.peek().type) {
      var block = this.block();
      for (var i = 0, len = block.nodes.length; i < len; ++i) {
        tag.block.push(block.nodes[i]);
      }
    }

    return tag;
  }
};

},{"./filters":4,"./lexer":6,"./nodes":16,"./utils":25,"character-parser":29,"constantinople":30,"fs":26,"path":27}],24:[function(require,module,exports){
'use strict';

/**
 * Merge two attribute objects giving precedence
 * to values in object `b`. Classes are special-cased
 * allowing for arrays and merging/joining appropriately
 * resulting in a string.
 *
 * @param {Object} a
 * @param {Object} b
 * @return {Object} a
 * @api private
 */

exports.merge = function merge(a, b) {
  if (arguments.length === 1) {
    var attrs = a[0];
    for (var i = 1; i < a.length; i++) {
      attrs = merge(attrs, a[i]);
    }
    return attrs;
  }
  var ac = a['class'];
  var bc = b['class'];

  if (ac || bc) {
    ac = ac || [];
    bc = bc || [];
    if (!Array.isArray(ac)) ac = [ac];
    if (!Array.isArray(bc)) bc = [bc];
    a['class'] = ac.concat(bc).filter(nulls);
  }

  for (var key in b) {
    if (key != 'class') {
      a[key] = b[key];
    }
  }

  return a;
};

/**
 * Filter null `val`s.
 *
 * @param {*} val
 * @return {Boolean}
 * @api private
 */

function nulls(val) {
  return val != null && val !== '';
}

/**
 * join array as classes.
 *
 * @param {*} val
 * @return {String}
 */
exports.joinClasses = joinClasses;
function joinClasses(val) {
  return (Array.isArray(val) ? val.map(joinClasses) :
    (val && typeof val === 'object') ? Object.keys(val).filter(function (key) { return val[key]; }) :
    [val]).filter(nulls).join(' ');
}

/**
 * Render the given classes.
 *
 * @param {Array} classes
 * @param {Array.<Boolean>} escaped
 * @return {String}
 */
exports.cls = function cls(classes, escaped) {
  var buf = [];
  for (var i = 0; i < classes.length; i++) {
    if (escaped && escaped[i]) {
      buf.push(exports.escape(joinClasses([classes[i]])));
    } else {
      buf.push(joinClasses(classes[i]));
    }
  }
  var text = joinClasses(buf);
  if (text.length) {
    return ' class="' + text + '"';
  } else {
    return '';
  }
};


exports.style = function (val) {
  if (val && typeof val === 'object') {
    return Object.keys(val).map(function (style) {
      return style + ':' + val[style];
    }).join(';');
  } else {
    return val;
  }
};
/**
 * Render the given attribute.
 *
 * @param {String} key
 * @param {String} val
 * @param {Boolean} escaped
 * @param {Boolean} terse
 * @return {String}
 */
exports.attr = function attr(key, val, escaped, terse) {
  if (key === 'style') {
    val = exports.style(val);
  }
  if ('boolean' == typeof val || null == val) {
    if (val) {
      return ' ' + (terse ? key : key + '="' + key + '"');
    } else {
      return '';
    }
  } else if (0 == key.indexOf('data') && 'string' != typeof val) {
    if (JSON.stringify(val).indexOf('&') !== -1) {
      console.warn('Since Jade 2.0.0, ampersands (`&`) in data attributes ' +
                   'will be escaped to `&amp;`');
    };
    if (val && typeof val.toISOString === 'function') {
      console.warn('Jade will eliminate the double quotes around dates in ' +
                   'ISO form after 2.0.0');
    }
    return ' ' + key + "='" + JSON.stringify(val).replace(/'/g, '&apos;') + "'";
  } else if (escaped) {
    if (val && typeof val.toISOString === 'function') {
      console.warn('Jade will stringify dates in ISO form after 2.0.0');
    }
    return ' ' + key + '="' + exports.escape(val) + '"';
  } else {
    if (val && typeof val.toISOString === 'function') {
      console.warn('Jade will stringify dates in ISO form after 2.0.0');
    }
    return ' ' + key + '="' + val + '"';
  }
};

/**
 * Render the given attributes object.
 *
 * @param {Object} obj
 * @param {Object} escaped
 * @return {String}
 */
exports.attrs = function attrs(obj, terse){
  var buf = [];

  var keys = Object.keys(obj);

  if (keys.length) {
    for (var i = 0; i < keys.length; ++i) {
      var key = keys[i]
        , val = obj[key];

      if ('class' == key) {
        if (val = joinClasses(val)) {
          buf.push(' ' + key + '="' + val + '"');
        }
      } else {
        buf.push(exports.attr(key, val, false, terse));
      }
    }
  }

  return buf.join('');
};

/**
 * Escape the given string of `html`.
 *
 * @param {String} html
 * @return {String}
 * @api private
 */

var jade_encode_html_rules = {
  '&': '&amp;',
  '<': '&lt;',
  '>': '&gt;',
  '"': '&quot;'
};
var jade_match_html = /[&<>"]/g;

function jade_encode_char(c) {
  return jade_encode_html_rules[c] || c;
}

exports.escape = jade_escape;
function jade_escape(html){
  var result = String(html).replace(jade_match_html, jade_encode_char);
  if (result === '' + html) return html;
  else return result;
};

/**
 * Re-throw the given `err` in context to the
 * the jade in `filename` at the given `lineno`.
 *
 * @param {Error} err
 * @param {String} filename
 * @param {String} lineno
 * @api private
 */

exports.rethrow = function rethrow(err, filename, lineno, str){
  if (!(err instanceof Error)) throw err;
  if ((typeof window != 'undefined' || !filename) && !str) {
    err.message += ' on line ' + lineno;
    throw err;
  }
  try {
    str = str || require('fs').readFileSync(filename, 'utf8')
  } catch (ex) {
    rethrow(err, null, lineno)
  }
  var context = 3
    , lines = str.split('\n')
    , start = Math.max(lineno - context, 0)
    , end = Math.min(lines.length, lineno + context);

  // Error context
  var context = lines.slice(start, end).map(function(line, i){
    var curr = i + start + 1;
    return (curr == lineno ? '  > ' : '    ')
      + curr
      + '| '
      + line;
  }).join('\n');

  // Alter exception message
  err.path = filename;
  err.message = (filename || 'Jade') + ':' + lineno
    + '\n' + context + '\n\n' + err.message;
  throw err;
};

exports.DebugItem = function DebugItem(lineno, filename) {
  this.lineno = lineno;
  this.filename = filename;
}

},{"fs":26}],25:[function(require,module,exports){
'use strict';

/**
 * Merge `b` into `a`.
 *
 * @param {Object} a
 * @param {Object} b
 * @return {Object}
 * @api public
 */

exports.merge = function(a, b) {
  for (var key in b) a[key] = b[key];
  return a;
};

exports.stringify = function(str) {
  return JSON.stringify(str)
             .replace(/\u2028/g, '\\u2028')
             .replace(/\u2029/g, '\\u2029');
};

exports.walkAST = function walkAST(ast, before, after) {
  before && before(ast);
  switch (ast.type) {
    case 'Block':
      ast.nodes.forEach(function (node) {
        walkAST(node, before, after);
      });
      break;
    case 'Case':
    case 'Each':
    case 'Mixin':
    case 'Tag':
    case 'When':
    case 'Code':
      ast.block && walkAST(ast.block, before, after);
      break;
    case 'Attrs':
    case 'BlockComment':
    case 'Comment':
    case 'Doctype':
    case 'Filter':
    case 'Literal':
    case 'MixinBlock':
    case 'Text':
      break;
    default:
      throw new Error('Unexpected node type ' + ast.type);
      break;
  }
  after && after(ast);
};

},{}],26:[function(require,module,exports){

},{}],27:[function(require,module,exports){
(function (process){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

// resolves . and .. elements in a path array with directory names there
// must be no slashes, empty elements, or device names (c:\) in the array
// (so also no leading and trailing slashes - it does not distinguish
// relative and absolute paths)
function normalizeArray(parts, allowAboveRoot) {
  // if the path tries to go above the root, `up` ends up > 0
  var up = 0;
  for (var i = parts.length - 1; i >= 0; i--) {
    var last = parts[i];
    if (last === '.') {
      parts.splice(i, 1);
    } else if (last === '..') {
      parts.splice(i, 1);
      up++;
    } else if (up) {
      parts.splice(i, 1);
      up--;
    }
  }

  // if the path is allowed to go above the root, restore leading ..s
  if (allowAboveRoot) {
    for (; up--; up) {
      parts.unshift('..');
    }
  }

  return parts;
}

// Split a filename into [root, dir, basename, ext], unix version
// 'root' is just a slash, or nothing.
var splitPathRe =
    /^(\/?|)([\s\S]*?)((?:\.{1,2}|[^\/]+?|)(\.[^.\/]*|))(?:[\/]*)$/;
var splitPath = function(filename) {
  return splitPathRe.exec(filename).slice(1);
};

// path.resolve([from ...], to)
// posix version
exports.resolve = function() {
  var resolvedPath = '',
      resolvedAbsolute = false;

  for (var i = arguments.length - 1; i >= -1 && !resolvedAbsolute; i--) {
    var path = (i >= 0) ? arguments[i] : process.cwd();

    // Skip empty and invalid entries
    if (typeof path !== 'string') {
      throw new TypeError('Arguments to path.resolve must be strings');
    } else if (!path) {
      continue;
    }

    resolvedPath = path + '/' + resolvedPath;
    resolvedAbsolute = path.charAt(0) === '/';
  }

  // At this point the path should be resolved to a full absolute path, but
  // handle relative paths to be safe (might happen when process.cwd() fails)

  // Normalize the path
  resolvedPath = normalizeArray(filter(resolvedPath.split('/'), function(p) {
    return !!p;
  }), !resolvedAbsolute).join('/');

  return ((resolvedAbsolute ? '/' : '') + resolvedPath) || '.';
};

// path.normalize(path)
// posix version
exports.normalize = function(path) {
  var isAbsolute = exports.isAbsolute(path),
      trailingSlash = substr(path, -1) === '/';

  // Normalize the path
  path = normalizeArray(filter(path.split('/'), function(p) {
    return !!p;
  }), !isAbsolute).join('/');

  if (!path && !isAbsolute) {
    path = '.';
  }
  if (path && trailingSlash) {
    path += '/';
  }

  return (isAbsolute ? '/' : '') + path;
};

// posix version
exports.isAbsolute = function(path) {
  return path.charAt(0) === '/';
};

// posix version
exports.join = function() {
  var paths = Array.prototype.slice.call(arguments, 0);
  return exports.normalize(filter(paths, function(p, index) {
    if (typeof p !== 'string') {
      throw new TypeError('Arguments to path.join must be strings');
    }
    return p;
  }).join('/'));
};


// path.relative(from, to)
// posix version
exports.relative = function(from, to) {
  from = exports.resolve(from).substr(1);
  to = exports.resolve(to).substr(1);

  function trim(arr) {
    var start = 0;
    for (; start < arr.length; start++) {
      if (arr[start] !== '') break;
    }

    var end = arr.length - 1;
    for (; end >= 0; end--) {
      if (arr[end] !== '') break;
    }

    if (start > end) return [];
    return arr.slice(start, end - start + 1);
  }

  var fromParts = trim(from.split('/'));
  var toParts = trim(to.split('/'));

  var length = Math.min(fromParts.length, toParts.length);
  var samePartsLength = length;
  for (var i = 0; i < length; i++) {
    if (fromParts[i] !== toParts[i]) {
      samePartsLength = i;
      break;
    }
  }

  var outputParts = [];
  for (var i = samePartsLength; i < fromParts.length; i++) {
    outputParts.push('..');
  }

  outputParts = outputParts.concat(toParts.slice(samePartsLength));

  return outputParts.join('/');
};

exports.sep = '/';
exports.delimiter = ':';

exports.dirname = function(path) {
  var result = splitPath(path),
      root = result[0],
      dir = result[1];

  if (!root && !dir) {
    // No dirname whatsoever
    return '.';
  }

  if (dir) {
    // It has a dirname, strip trailing slash
    dir = dir.substr(0, dir.length - 1);
  }

  return root + dir;
};


exports.basename = function(path, ext) {
  var f = splitPath(path)[2];
  // TODO: make this comparison case-insensitive on windows?
  if (ext && f.substr(-1 * ext.length) === ext) {
    f = f.substr(0, f.length - ext.length);
  }
  return f;
};


exports.extname = function(path) {
  return splitPath(path)[3];
};

function filter (xs, f) {
    if (xs.filter) return xs.filter(f);
    var res = [];
    for (var i = 0; i < xs.length; i++) {
        if (f(xs[i], i, xs)) res.push(xs[i]);
    }
    return res;
}

// String.prototype.substr - negative index don't work in IE8
var substr = 'ab'.substr(-1) === 'b'
    ? function (str, start, len) { return str.substr(start, len) }
    : function (str, start, len) {
        if (start < 0) start = str.length + start;
        return str.substr(start, len);
    }
;

}).call(this,require('_process'))
},{"_process":28}],28:[function(require,module,exports){
// shim for using process in browser

var process = module.exports = {};
var queue = [];
var draining = false;
var currentQueue;
var queueIndex = -1;

function cleanUpNextTick() {
    draining = false;
    if (currentQueue.length) {
        queue = currentQueue.concat(queue);
    } else {
        queueIndex = -1;
    }
    if (queue.length) {
        drainQueue();
    }
}

function drainQueue() {
    if (draining) {
        return;
    }
    var timeout = setTimeout(cleanUpNextTick);
    draining = true;

    var len = queue.length;
    while(len) {
        currentQueue = queue;
        queue = [];
        while (++queueIndex < len) {
            currentQueue[queueIndex].run();
        }
        queueIndex = -1;
        len = queue.length;
    }
    currentQueue = null;
    draining = false;
    clearTimeout(timeout);
}

process.nextTick = function (fun) {
    var args = new Array(arguments.length - 1);
    if (arguments.length > 1) {
        for (var i = 1; i < arguments.length; i++) {
            args[i - 1] = arguments[i];
        }
    }
    queue.push(new Item(fun, args));
    if (queue.length === 1 && !draining) {
        setTimeout(drainQueue, 0);
    }
};

// v8 likes predictible objects
function Item(fun, array) {
    this.fun = fun;
    this.array = array;
}
Item.prototype.run = function () {
    this.fun.apply(null, this.array);
};
process.title = 'browser';
process.browser = true;
process.env = {};
process.argv = [];
process.version = ''; // empty string to avoid regexp issues
process.versions = {};

function noop() {}

process.on = noop;
process.addListener = noop;
process.once = noop;
process.off = noop;
process.removeListener = noop;
process.removeAllListeners = noop;
process.emit = noop;

process.binding = function (name) {
    throw new Error('process.binding is not supported');
};

// TODO(shtylman)
process.cwd = function () { return '/' };
process.chdir = function (dir) {
    throw new Error('process.chdir is not supported');
};
process.umask = function() { return 0; };

},{}],29:[function(require,module,exports){
exports = (module.exports = parse);
exports.parse = parse;
function parse(src, state, options) {
  options = options || {};
  state = state || exports.defaultState();
  var start = options.start || 0;
  var end = options.end || src.length;
  var index = start;
  while (index < end) {
    if (state.roundDepth < 0 || state.curlyDepth < 0 || state.squareDepth < 0) {
      throw new SyntaxError('Mismatched Bracket: ' + src[index - 1]);
    }
    exports.parseChar(src[index++], state);
  }
  return state;
}

exports.parseMax = parseMax;
function parseMax(src, options) {
  options = options || {};
  var start = options.start || 0;
  var index = start;
  var state = exports.defaultState();
  while (state.roundDepth >= 0 && state.curlyDepth >= 0 && state.squareDepth >= 0) {
    if (index >= src.length) {
      throw new Error('The end of the string was reached with no closing bracket found.');
    }
    exports.parseChar(src[index++], state);
  }
  var end = index - 1;
  return {
    start: start,
    end: end,
    src: src.substring(start, end)
  };
}

exports.parseUntil = parseUntil;
function parseUntil(src, delimiter, options) {
  options = options || {};
  var includeLineComment = options.includeLineComment || false;
  var start = options.start || 0;
  var index = start;
  var state = exports.defaultState();
  while (state.isString() || state.regexp || state.blockComment ||
         (!includeLineComment && state.lineComment) || !startsWith(src, delimiter, index)) {
    exports.parseChar(src[index++], state);
  }
  var end = index;
  return {
    start: start,
    end: end,
    src: src.substring(start, end)
  };
}


exports.parseChar = parseChar;
function parseChar(character, state) {
  if (character.length !== 1) throw new Error('Character must be a string of length 1');
  state = state || exports.defaultState();
  state.src = state.src || '';
  state.src += character;
  var wasComment = state.blockComment || state.lineComment;
  var lastChar = state.history ? state.history[0] : '';

  if (state.regexpStart) {
    if (character === '/' || character == '*') {
      state.regexp = false;
    }
    state.regexpStart = false;
  }
  if (state.lineComment) {
    if (character === '\n') {
      state.lineComment = false;
    }
  } else if (state.blockComment) {
    if (state.lastChar === '*' && character === '/') {
      state.blockComment = false;
    }
  } else if (state.singleQuote) {
    if (character === '\'' && !state.escaped) {
      state.singleQuote = false;
    } else if (character === '\\' && !state.escaped) {
      state.escaped = true;
    } else {
      state.escaped = false;
    }
  } else if (state.doubleQuote) {
    if (character === '"' && !state.escaped) {
      state.doubleQuote = false;
    } else if (character === '\\' && !state.escaped) {
      state.escaped = true;
    } else {
      state.escaped = false;
    }
  } else if (state.regexp) {
    if (character === '/' && !state.escaped) {
      state.regexp = false;
    } else if (character === '\\' && !state.escaped) {
      state.escaped = true;
    } else {
      state.escaped = false;
    }
  } else if (lastChar === '/' && character === '/') {
    state.history = state.history.substr(1);
    state.lineComment = true;
  } else if (lastChar === '/' && character === '*') {
    state.history = state.history.substr(1);
    state.blockComment = true;
  } else if (character === '/' && isRegexp(state.history)) {
    state.regexp = true;
    state.regexpStart = true;
  } else if (character === '\'') {
    state.singleQuote = true;
  } else if (character === '"') {
    state.doubleQuote = true;
  } else if (character === '(') {
    state.roundDepth++;
  } else if (character === ')') {
    state.roundDepth--;
  } else if (character === '{') {
    state.curlyDepth++;
  } else if (character === '}') {
    state.curlyDepth--;
  } else if (character === '[') {
    state.squareDepth++;
  } else if (character === ']') {
    state.squareDepth--;
  }
  if (!state.blockComment && !state.lineComment && !wasComment) state.history = character + state.history;
  state.lastChar = character; // store last character for ending block comments
  return state;
}

exports.defaultState = function () { return new State() };
function State() {
  this.lineComment = false;
  this.blockComment = false;

  this.singleQuote = false;
  this.doubleQuote = false;
  this.regexp = false;

  this.escaped = false;

  this.roundDepth = 0;
  this.curlyDepth = 0;
  this.squareDepth = 0;

  this.history = ''
  this.lastChar = ''
}
State.prototype.isString = function () {
  return this.singleQuote || this.doubleQuote;
}
State.prototype.isComment = function () {
  return this.lineComment || this.blockComment;
}
State.prototype.isNesting = function () {
  return this.isString() || this.isComment() || this.regexp || this.roundDepth > 0 || this.curlyDepth > 0 || this.squareDepth > 0
}

function startsWith(str, start, i) {
  return str.substr(i || 0, start.length) === start;
}

exports.isPunctuator = isPunctuator
function isPunctuator(c) {
  if (!c) return true; // the start of a string is a punctuator
  var code = c.charCodeAt(0)

  switch (code) {
    case 46:   // . dot
    case 40:   // ( open bracket
    case 41:   // ) close bracket
    case 59:   // ; semicolon
    case 44:   // , comma
    case 123:  // { open curly brace
    case 125:  // } close curly brace
    case 91:   // [
    case 93:   // ]
    case 58:   // :
    case 63:   // ?
    case 126:  // ~
    case 37:   // %
    case 38:   // &
    case 42:   // *:
    case 43:   // +
    case 45:   // -
    case 47:   // /
    case 60:   // <
    case 62:   // >
    case 94:   // ^
    case 124:  // |
    case 33:   // !
    case 61:   // =
      return true;
    default:
      return false;
  }
}
exports.isKeyword = isKeyword
function isKeyword(id) {
  return (id === 'if') || (id === 'in') || (id === 'do') || (id === 'var') || (id === 'for') || (id === 'new') ||
         (id === 'try') || (id === 'let') || (id === 'this') || (id === 'else') || (id === 'case') ||
         (id === 'void') || (id === 'with') || (id === 'enum') || (id === 'while') || (id === 'break') || (id === 'catch') ||
         (id === 'throw') || (id === 'const') || (id === 'yield') || (id === 'class') || (id === 'super') ||
         (id === 'return') || (id === 'typeof') || (id === 'delete') || (id === 'switch') || (id === 'export') ||
         (id === 'import') || (id === 'default') || (id === 'finally') || (id === 'extends') || (id === 'function') ||
         (id === 'continue') || (id === 'debugger') || (id === 'package') || (id === 'private') || (id === 'interface') ||
         (id === 'instanceof') || (id === 'implements') || (id === 'protected') || (id === 'public') || (id === 'static') ||
         (id === 'yield') || (id === 'let');
}

function isRegexp(history) {
  //could be start of regexp or divide sign

  history = history.replace(/^\s*/, '');

  //unless its an `if`, `while`, `for` or `with` it's a divide, so we assume it's a divide
  if (history[0] === ')') return false;
  //unless it's a function expression, it's a regexp, so we assume it's a regexp
  if (history[0] === '}') return true;
  //any punctuation means it's a regexp
  if (isPunctuator(history[0])) return true;
  //if the last thing was a keyword then it must be a regexp (e.g. `typeof /foo/`)
  if (/^\w+\b/.test(history) && isKeyword(/^\w+\b/.exec(history)[0].split('').reverse().join(''))) return true;

  return false;
}

},{}],30:[function(require,module,exports){
'use strict'

var detect = require('acorn-globals');

var lastSRC = '(null)';
var lastRes = true;
var lastConstants = undefined;

module.exports = isConstant;
function isConstant(src, constants) {
  src = '(' + src + ')';
  if (lastSRC === src && lastConstants === constants) return lastRes;
  lastSRC = src;
  lastConstants = constants;
  try {
    isExpression(src);
    return lastRes = (detect(src).filter(function (key) {
      return !constants || !(key.name in constants);
    }).length === 0);
  } catch (ex) {
    return lastRes = false;
  }
}
isConstant.isConstant = isConstant;

isConstant.toConstant = toConstant;
function toConstant(src, constants) {
  if (!isConstant(src, constants)) throw new Error(JSON.stringify(src) + ' is not constant.');
  return Function(Object.keys(constants || {}).join(','), 'return (' + src + ')').apply(null, Object.keys(constants || {}).map(function (key) {
    return constants[key];
  }));
}

function isExpression(src) {
  try {
    eval('throw "STOP"; (function () { return (' + src + '); })()');
    return false;
  }
  catch (err) {
    return err === 'STOP';
  }
}

},{"acorn-globals":31}],31:[function(require,module,exports){
'use strict';

var acorn = require('acorn');
var walk = require('acorn/dist/walk');

// polyfill for https://github.com/marijnh/acorn/pull/231
walk.base.ExportNamedDeclaration = walk.base.ExportDefaultDeclaration = function (node, st, c) {
  return c(node.declaration, st);
};
walk.base.ImportDefaultSpecifier = walk.base.ImportNamespaceSpecifier = function () {};

function isScope(node) {
  return node.type === 'FunctionExpression' || node.type === 'FunctionDeclaration' || node.type === 'Program';
}
function isBlockScope(node) {
  return node.type === 'BlockStatement' || isScope(node);
}

function declaresArguments(node) {
  return node.type === 'FunctionExpression' || node.type === 'FunctionDeclaration' || node.type === 'ArrowFunction';
}
function declaresThis(node) {
  return node.type === 'FunctionExpression' || node.type === 'FunctionDeclaration';
}

function reallyParse(source) {
  try {
    return acorn.parse(source, {
      ecmaVersion: 6,
      allowReturnOutsideFunction: true,
      sourceType: 'module'
    });
  } catch (ex) {
    if (ex.name !== 'SyntaxError') {
      throw ex;
    }
    try {
      return acorn.parse(source, {
        ecmaVersion: 6,
        allowReturnOutsideFunction: true
      });
    } catch (ex) {
      if (ex.name !== 'SyntaxError') {
        throw ex;
      }
      return acorn.parse(source, {
        ecmaVersion: 5,
        allowReturnOutsideFunction: true
      });
    }
  }
}
module.exports = findGlobals;
module.exports.parse = reallyParse;
function findGlobals(source) {
  var globals = [];
  var ast = typeof source === 'string' ?
    ast = reallyParse(source) :
    source;
  if (!(ast && typeof ast === 'object' && ast.type === 'Program')) {
    throw new TypeError('Source must be either a string of JavaScript or an acorn AST');
  }
  var declareFunction = function (node) {
    var fn = node;
    fn.locals = fn.locals || {};
    node.params.forEach(function (node) {
      fn.locals[node.name] = true;
    });
    if (node.id) {
      fn.locals[node.id.name] = true;
    }
  }
  walk.ancestor(ast, {
    'VariableDeclaration': function (node, parents) {
      var parent = null;
      for (var i = parents.length - 1; i >= 0 && parent === null; i--) {
        if (node.kind === 'var' ? isScope(parents[i]) : isBlockScope(parents[i])) {
          parent = parents[i];
        }
      }
      parent.locals = parent.locals || {};
      node.declarations.forEach(function (declaration) {
        parent.locals[declaration.id.name] = true;
      });
    },
    'FunctionDeclaration': function (node, parents) {
      var parent = null;
      for (var i = parents.length - 2; i >= 0 && parent === null; i--) {
        if (isScope(parents[i])) {
          parent = parents[i];
        }
      }
      parent.locals = parent.locals || {};
      parent.locals[node.id.name] = true;
      declareFunction(node);
    },
    'Function': declareFunction,
    'TryStatement': function (node) {
      node.handler.body.locals = node.handler.body.locals || {};
      node.handler.body.locals[node.handler.param.name] = true;
    },
    'ImportDefaultSpecifier': function (node) {
      if (node.local.type === 'Identifier') {
        ast.locals = ast.locals || {};
        ast.locals[node.local.name] = true;
      }
    },
    'ImportSpecifier': function (node) {
      var id = node.local ? node.local : node.imported;
      if (id.type === 'Identifier') {
        ast.locals = ast.locals || {};
        ast.locals[id.name] = true;
      }
    },
    'ImportNamespaceSpecifier': function (node) {
      if (node.local.type === 'Identifier') {
        ast.locals = ast.locals || {};
        ast.locals[node.local.name] = true;
      }
    }
  });
  walk.ancestor(ast, {
    'Identifier': function (node, parents) {
      var name = node.name;
      if (name === 'undefined') return;
      for (var i = 0; i < parents.length; i++) {
        if (name === 'arguments' && declaresArguments(parents[i])) {
          return;
        }
        if (parents[i].locals && name in parents[i].locals) {
          return;
        }
      }
      node.parents = parents;
      globals.push(node);
    },
    ThisExpression: function (node, parents) {
      for (var i = 0; i < parents.length; i++) {
        if (declaresThis(parents[i])) {
          return;
        }
      }
      node.parents = parents;
      globals.push(node);
    }
  });
  var groupedGlobals = {};
  globals.forEach(function (node) {
    groupedGlobals[node.name] = (groupedGlobals[node.name] || []);
    groupedGlobals[node.name].push(node);
  });
  return Object.keys(groupedGlobals).sort().map(function (name) {
    return {name: name, nodes: groupedGlobals[name]};
  });
}

},{"acorn":32,"acorn/dist/walk":33}],32:[function(require,module,exports){
(function (global){
(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.acorn = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(_dereq_,module,exports){


// The main exported interface (under `self.acorn` when in the
// browser) is a `parse` function that takes a code string and
// returns an abstract syntax tree as specified by [Mozilla parser
// API][api].
//
// [api]: https://developer.mozilla.org/en-US/docs/SpiderMonkey/Parser_API

"use strict";

exports.parse = parse;

// This function tries to parse a single expression at a given
// offset in a string. Useful for parsing mixed-language formats
// that embed JavaScript expressions.

exports.parseExpressionAt = parseExpressionAt;

// Acorn is organized as a tokenizer and a recursive-descent parser.
// The `tokenize` export provides an interface to the tokenizer.

exports.tokenizer = tokenizer;
exports.__esModule = true;
// Acorn is a tiny, fast JavaScript parser written in JavaScript.
//
// Acorn was written by Marijn Haverbeke, Ingvar Stepanyan, and
// various contributors and released under an MIT license.
//
// Git repositories for Acorn are available at
//
//     http://marijnhaverbeke.nl/git/acorn
//     https://github.com/marijnh/acorn.git
//
// Please use the [github bug tracker][ghbt] to report issues.
//
// [ghbt]: https://github.com/marijnh/acorn/issues
//
// This file defines the main parser interface. The library also comes
// with a [error-tolerant parser][dammit] and an
// [abstract syntax tree walker][walk], defined in other files.
//
// [dammit]: acorn_loose.js
// [walk]: util/walk.js

var _state = _dereq_("./state");

var Parser = _state.Parser;

var _options = _dereq_("./options");

var getOptions = _options.getOptions;

_dereq_("./parseutil");

_dereq_("./statement");

_dereq_("./lval");

_dereq_("./expression");

exports.Parser = _state.Parser;
exports.plugins = _state.plugins;
exports.defaultOptions = _options.defaultOptions;

var _location = _dereq_("./location");

exports.SourceLocation = _location.SourceLocation;
exports.getLineInfo = _location.getLineInfo;
exports.Node = _dereq_("./node").Node;

var _tokentype = _dereq_("./tokentype");

exports.TokenType = _tokentype.TokenType;
exports.tokTypes = _tokentype.types;

var _tokencontext = _dereq_("./tokencontext");

exports.TokContext = _tokencontext.TokContext;
exports.tokContexts = _tokencontext.types;

var _identifier = _dereq_("./identifier");

exports.isIdentifierChar = _identifier.isIdentifierChar;
exports.isIdentifierStart = _identifier.isIdentifierStart;
exports.Token = _dereq_("./tokenize").Token;

var _whitespace = _dereq_("./whitespace");

exports.isNewLine = _whitespace.isNewLine;
exports.lineBreak = _whitespace.lineBreak;
exports.lineBreakG = _whitespace.lineBreakG;
var version = "1.2.2";exports.version = version;

function parse(input, options) {
  var p = parser(options, input);
  var startPos = p.pos,
      startLoc = p.options.locations && p.curPosition();
  p.nextToken();
  return p.parseTopLevel(p.options.program || p.startNodeAt(startPos, startLoc));
}

function parseExpressionAt(input, pos, options) {
  var p = parser(options, input, pos);
  p.nextToken();
  return p.parseExpression();
}

function tokenizer(input, options) {
  return parser(options, input);
}

function parser(options, input) {
  return new Parser(getOptions(options), String(input));
}

},{"./expression":6,"./identifier":7,"./location":8,"./lval":9,"./node":10,"./options":11,"./parseutil":12,"./state":13,"./statement":14,"./tokencontext":15,"./tokenize":16,"./tokentype":17,"./whitespace":19}],2:[function(_dereq_,module,exports){
if (typeof Object.create === 'function') {
  // implementation from standard node.js 'util' module
  module.exports = function inherits(ctor, superCtor) {
    ctor.super_ = superCtor
    ctor.prototype = Object.create(superCtor.prototype, {
      constructor: {
        value: ctor,
        enumerable: false,
        writable: true,
        configurable: true
      }
    });
  };
} else {
  // old school shim for old browsers
  module.exports = function inherits(ctor, superCtor) {
    ctor.super_ = superCtor
    var TempCtor = function () {}
    TempCtor.prototype = superCtor.prototype
    ctor.prototype = new TempCtor()
    ctor.prototype.constructor = ctor
  }
}

},{}],3:[function(_dereq_,module,exports){
// shim for using process in browser

var process = module.exports = {};
var queue = [];
var draining = false;

function drainQueue() {
    if (draining) {
        return;
    }
    draining = true;
    var currentQueue;
    var len = queue.length;
    while(len) {
        currentQueue = queue;
        queue = [];
        var i = -1;
        while (++i < len) {
            currentQueue[i]();
        }
        len = queue.length;
    }
    draining = false;
}
process.nextTick = function (fun) {
    queue.push(fun);
    if (!draining) {
        setTimeout(drainQueue, 0);
    }
};

process.title = 'browser';
process.browser = true;
process.env = {};
process.argv = [];
process.version = ''; // empty string to avoid regexp issues
process.versions = {};

function noop() {}

process.on = noop;
process.addListener = noop;
process.once = noop;
process.off = noop;
process.removeListener = noop;
process.removeAllListeners = noop;
process.emit = noop;

process.binding = function (name) {
    throw new Error('process.binding is not supported');
};

// TODO(shtylman)
process.cwd = function () { return '/' };
process.chdir = function (dir) {
    throw new Error('process.chdir is not supported');
};
process.umask = function() { return 0; };

},{}],4:[function(_dereq_,module,exports){
module.exports = function isBuffer(arg) {
  return arg && typeof arg === 'object'
    && typeof arg.copy === 'function'
    && typeof arg.fill === 'function'
    && typeof arg.readUInt8 === 'function';
}
},{}],5:[function(_dereq_,module,exports){
(function (process,global){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

var formatRegExp = /%[sdj%]/g;
exports.format = function(f) {
  if (!isString(f)) {
    var objects = [];
    for (var i = 0; i < arguments.length; i++) {
      objects.push(inspect(arguments[i]));
    }
    return objects.join(' ');
  }

  var i = 1;
  var args = arguments;
  var len = args.length;
  var str = String(f).replace(formatRegExp, function(x) {
    if (x === '%%') return '%';
    if (i >= len) return x;
    switch (x) {
      case '%s': return String(args[i++]);
      case '%d': return Number(args[i++]);
      case '%j':
        try {
          return JSON.stringify(args[i++]);
        } catch (_) {
          return '[Circular]';
        }
      default:
        return x;
    }
  });
  for (var x = args[i]; i < len; x = args[++i]) {
    if (isNull(x) || !isObject(x)) {
      str += ' ' + x;
    } else {
      str += ' ' + inspect(x);
    }
  }
  return str;
};


// Mark that a method should not be used.
// Returns a modified function which warns once by default.
// If --no-deprecation is set, then it is a no-op.
exports.deprecate = function(fn, msg) {
  // Allow for deprecating things in the process of starting up.
  if (isUndefined(global.process)) {
    return function() {
      return exports.deprecate(fn, msg).apply(this, arguments);
    };
  }

  if (process.noDeprecation === true) {
    return fn;
  }

  var warned = false;
  function deprecated() {
    if (!warned) {
      if (process.throwDeprecation) {
        throw new Error(msg);
      } else if (process.traceDeprecation) {
        console.trace(msg);
      } else {
        console.error(msg);
      }
      warned = true;
    }
    return fn.apply(this, arguments);
  }

  return deprecated;
};


var debugs = {};
var debugEnviron;
exports.debuglog = function(set) {
  if (isUndefined(debugEnviron))
    debugEnviron = process.env.NODE_DEBUG || '';
  set = set.toUpperCase();
  if (!debugs[set]) {
    if (new RegExp('\\b' + set + '\\b', 'i').test(debugEnviron)) {
      var pid = process.pid;
      debugs[set] = function() {
        var msg = exports.format.apply(exports, arguments);
        console.error('%s %d: %s', set, pid, msg);
      };
    } else {
      debugs[set] = function() {};
    }
  }
  return debugs[set];
};


/**
 * Echos the value of a value. Trys to print the value out
 * in the best way possible given the different types.
 *
 * @param {Object} obj The object to print out.
 * @param {Object} opts Optional options object that alters the output.
 */
/* legacy: obj, showHidden, depth, colors*/
function inspect(obj, opts) {
  // default options
  var ctx = {
    seen: [],
    stylize: stylizeNoColor
  };
  // legacy...
  if (arguments.length >= 3) ctx.depth = arguments[2];
  if (arguments.length >= 4) ctx.colors = arguments[3];
  if (isBoolean(opts)) {
    // legacy...
    ctx.showHidden = opts;
  } else if (opts) {
    // got an "options" object
    exports._extend(ctx, opts);
  }
  // set default options
  if (isUndefined(ctx.showHidden)) ctx.showHidden = false;
  if (isUndefined(ctx.depth)) ctx.depth = 2;
  if (isUndefined(ctx.colors)) ctx.colors = false;
  if (isUndefined(ctx.customInspect)) ctx.customInspect = true;
  if (ctx.colors) ctx.stylize = stylizeWithColor;
  return formatValue(ctx, obj, ctx.depth);
}
exports.inspect = inspect;


// http://en.wikipedia.org/wiki/ANSI_escape_code#graphics
inspect.colors = {
  'bold' : [1, 22],
  'italic' : [3, 23],
  'underline' : [4, 24],
  'inverse' : [7, 27],
  'white' : [37, 39],
  'grey' : [90, 39],
  'black' : [30, 39],
  'blue' : [34, 39],
  'cyan' : [36, 39],
  'green' : [32, 39],
  'magenta' : [35, 39],
  'red' : [31, 39],
  'yellow' : [33, 39]
};

// Don't use 'blue' not visible on cmd.exe
inspect.styles = {
  'special': 'cyan',
  'number': 'yellow',
  'boolean': 'yellow',
  'undefined': 'grey',
  'null': 'bold',
  'string': 'green',
  'date': 'magenta',
  // "name": intentionally not styling
  'regexp': 'red'
};


function stylizeWithColor(str, styleType) {
  var style = inspect.styles[styleType];

  if (style) {
    return '\u001b[' + inspect.colors[style][0] + 'm' + str +
           '\u001b[' + inspect.colors[style][1] + 'm';
  } else {
    return str;
  }
}


function stylizeNoColor(str, styleType) {
  return str;
}


function arrayToHash(array) {
  var hash = {};

  array.forEach(function(val, idx) {
    hash[val] = true;
  });

  return hash;
}


function formatValue(ctx, value, recurseTimes) {
  // Provide a hook for user-specified inspect functions.
  // Check that value is an object with an inspect function on it
  if (ctx.customInspect &&
      value &&
      isFunction(value.inspect) &&
      // Filter out the util module, it's inspect function is special
      value.inspect !== exports.inspect &&
      // Also filter out any prototype objects using the circular check.
      !(value.constructor && value.constructor.prototype === value)) {
    var ret = value.inspect(recurseTimes, ctx);
    if (!isString(ret)) {
      ret = formatValue(ctx, ret, recurseTimes);
    }
    return ret;
  }

  // Primitive types cannot have properties
  var primitive = formatPrimitive(ctx, value);
  if (primitive) {
    return primitive;
  }

  // Look up the keys of the object.
  var keys = Object.keys(value);
  var visibleKeys = arrayToHash(keys);

  if (ctx.showHidden) {
    keys = Object.getOwnPropertyNames(value);
  }

  // IE doesn't make error fields non-enumerable
  // http://msdn.microsoft.com/en-us/library/ie/dww52sbt(v=vs.94).aspx
  if (isError(value)
      && (keys.indexOf('message') >= 0 || keys.indexOf('description') >= 0)) {
    return formatError(value);
  }

  // Some type of object without properties can be shortcutted.
  if (keys.length === 0) {
    if (isFunction(value)) {
      var name = value.name ? ': ' + value.name : '';
      return ctx.stylize('[Function' + name + ']', 'special');
    }
    if (isRegExp(value)) {
      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
    }
    if (isDate(value)) {
      return ctx.stylize(Date.prototype.toString.call(value), 'date');
    }
    if (isError(value)) {
      return formatError(value);
    }
  }

  var base = '', array = false, braces = ['{', '}'];

  // Make Array say that they are Array
  if (isArray(value)) {
    array = true;
    braces = ['[', ']'];
  }

  // Make functions say that they are functions
  if (isFunction(value)) {
    var n = value.name ? ': ' + value.name : '';
    base = ' [Function' + n + ']';
  }

  // Make RegExps say that they are RegExps
  if (isRegExp(value)) {
    base = ' ' + RegExp.prototype.toString.call(value);
  }

  // Make dates with properties first say the date
  if (isDate(value)) {
    base = ' ' + Date.prototype.toUTCString.call(value);
  }

  // Make error with message first say the error
  if (isError(value)) {
    base = ' ' + formatError(value);
  }

  if (keys.length === 0 && (!array || value.length == 0)) {
    return braces[0] + base + braces[1];
  }

  if (recurseTimes < 0) {
    if (isRegExp(value)) {
      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
    } else {
      return ctx.stylize('[Object]', 'special');
    }
  }

  ctx.seen.push(value);

  var output;
  if (array) {
    output = formatArray(ctx, value, recurseTimes, visibleKeys, keys);
  } else {
    output = keys.map(function(key) {
      return formatProperty(ctx, value, recurseTimes, visibleKeys, key, array);
    });
  }

  ctx.seen.pop();

  return reduceToSingleString(output, base, braces);
}


function formatPrimitive(ctx, value) {
  if (isUndefined(value))
    return ctx.stylize('undefined', 'undefined');
  if (isString(value)) {
    var simple = '\'' + JSON.stringify(value).replace(/^"|"$/g, '')
                                             .replace(/'/g, "\\'")
                                             .replace(/\\"/g, '"') + '\'';
    return ctx.stylize(simple, 'string');
  }
  if (isNumber(value))
    return ctx.stylize('' + value, 'number');
  if (isBoolean(value))
    return ctx.stylize('' + value, 'boolean');
  // For some reason typeof null is "object", so special case here.
  if (isNull(value))
    return ctx.stylize('null', 'null');
}


function formatError(value) {
  return '[' + Error.prototype.toString.call(value) + ']';
}


function formatArray(ctx, value, recurseTimes, visibleKeys, keys) {
  var output = [];
  for (var i = 0, l = value.length; i < l; ++i) {
    if (hasOwnProperty(value, String(i))) {
      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
          String(i), true));
    } else {
      output.push('');
    }
  }
  keys.forEach(function(key) {
    if (!key.match(/^\d+$/)) {
      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
          key, true));
    }
  });
  return output;
}


function formatProperty(ctx, value, recurseTimes, visibleKeys, key, array) {
  var name, str, desc;
  desc = Object.getOwnPropertyDescriptor(value, key) || { value: value[key] };
  if (desc.get) {
    if (desc.set) {
      str = ctx.stylize('[Getter/Setter]', 'special');
    } else {
      str = ctx.stylize('[Getter]', 'special');
    }
  } else {
    if (desc.set) {
      str = ctx.stylize('[Setter]', 'special');
    }
  }
  if (!hasOwnProperty(visibleKeys, key)) {
    name = '[' + key + ']';
  }
  if (!str) {
    if (ctx.seen.indexOf(desc.value) < 0) {
      if (isNull(recurseTimes)) {
        str = formatValue(ctx, desc.value, null);
      } else {
        str = formatValue(ctx, desc.value, recurseTimes - 1);
      }
      if (str.indexOf('\n') > -1) {
        if (array) {
          str = str.split('\n').map(function(line) {
            return '  ' + line;
          }).join('\n').substr(2);
        } else {
          str = '\n' + str.split('\n').map(function(line) {
            return '   ' + line;
          }).join('\n');
        }
      }
    } else {
      str = ctx.stylize('[Circular]', 'special');
    }
  }
  if (isUndefined(name)) {
    if (array && key.match(/^\d+$/)) {
      return str;
    }
    name = JSON.stringify('' + key);
    if (name.match(/^"([a-zA-Z_][a-zA-Z_0-9]*)"$/)) {
      name = name.substr(1, name.length - 2);
      name = ctx.stylize(name, 'name');
    } else {
      name = name.replace(/'/g, "\\'")
                 .replace(/\\"/g, '"')
                 .replace(/(^"|"$)/g, "'");
      name = ctx.stylize(name, 'string');
    }
  }

  return name + ': ' + str;
}


function reduceToSingleString(output, base, braces) {
  var numLinesEst = 0;
  var length = output.reduce(function(prev, cur) {
    numLinesEst++;
    if (cur.indexOf('\n') >= 0) numLinesEst++;
    return prev + cur.replace(/\u001b\[\d\d?m/g, '').length + 1;
  }, 0);

  if (length > 60) {
    return braces[0] +
           (base === '' ? '' : base + '\n ') +
           ' ' +
           output.join(',\n  ') +
           ' ' +
           braces[1];
  }

  return braces[0] + base + ' ' + output.join(', ') + ' ' + braces[1];
}


// NOTE: These type checking functions intentionally don't use `instanceof`
// because it is fragile and can be easily faked with `Object.create()`.
function isArray(ar) {
  return Array.isArray(ar);
}
exports.isArray = isArray;

function isBoolean(arg) {
  return typeof arg === 'boolean';
}
exports.isBoolean = isBoolean;

function isNull(arg) {
  return arg === null;
}
exports.isNull = isNull;

function isNullOrUndefined(arg) {
  return arg == null;
}
exports.isNullOrUndefined = isNullOrUndefined;

function isNumber(arg) {
  return typeof arg === 'number';
}
exports.isNumber = isNumber;

function isString(arg) {
  return typeof arg === 'string';
}
exports.isString = isString;

function isSymbol(arg) {
  return typeof arg === 'symbol';
}
exports.isSymbol = isSymbol;

function isUndefined(arg) {
  return arg === void 0;
}
exports.isUndefined = isUndefined;

function isRegExp(re) {
  return isObject(re) && objectToString(re) === '[object RegExp]';
}
exports.isRegExp = isRegExp;

function isObject(arg) {
  return typeof arg === 'object' && arg !== null;
}
exports.isObject = isObject;

function isDate(d) {
  return isObject(d) && objectToString(d) === '[object Date]';
}
exports.isDate = isDate;

function isError(e) {
  return isObject(e) &&
      (objectToString(e) === '[object Error]' || e instanceof Error);
}
exports.isError = isError;

function isFunction(arg) {
  return typeof arg === 'function';
}
exports.isFunction = isFunction;

function isPrimitive(arg) {
  return arg === null ||
         typeof arg === 'boolean' ||
         typeof arg === 'number' ||
         typeof arg === 'string' ||
         typeof arg === 'symbol' ||  // ES6 symbol
         typeof arg === 'undefined';
}
exports.isPrimitive = isPrimitive;

exports.isBuffer = _dereq_('./support/isBuffer');

function objectToString(o) {
  return Object.prototype.toString.call(o);
}


function pad(n) {
  return n < 10 ? '0' + n.toString(10) : n.toString(10);
}


var months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep',
              'Oct', 'Nov', 'Dec'];

// 26 Feb 16:19:34
function timestamp() {
  var d = new Date();
  var time = [pad(d.getHours()),
              pad(d.getMinutes()),
              pad(d.getSeconds())].join(':');
  return [d.getDate(), months[d.getMonth()], time].join(' ');
}


// log is just a thin wrapper to console.log that prepends a timestamp
exports.log = function() {
  console.log('%s - %s', timestamp(), exports.format.apply(exports, arguments));
};


/**
 * Inherit the prototype methods from one constructor into another.
 *
 * The Function.prototype.inherits from lang.js rewritten as a standalone
 * function (not on Function.prototype). NOTE: If this file is to be loaded
 * during bootstrapping this function needs to be rewritten using some native
 * functions as prototype setup using normal JavaScript does not work as
 * expected during bootstrapping (see mirror.js in r114903).
 *
 * @param {function} ctor Constructor function which needs to inherit the
 *     prototype.
 * @param {function} superCtor Constructor function to inherit prototype from.
 */
exports.inherits = _dereq_('inherits');

exports._extend = function(origin, add) {
  // Don't do anything if add isn't an object
  if (!add || !isObject(add)) return origin;

  var keys = Object.keys(add);
  var i = keys.length;
  while (i--) {
    origin[keys[i]] = add[keys[i]];
  }
  return origin;
};

function hasOwnProperty(obj, prop) {
  return Object.prototype.hasOwnProperty.call(obj, prop);
}

}).call(this,_dereq_('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"./support/isBuffer":4,"_process":3,"inherits":2}],6:[function(_dereq_,module,exports){
// A recursive descent parser operates by defining functions for all
// syntactic elements, and recursively calling those, each function
// advancing the input stream and returning an AST node. Precedence
// of constructs (for example, the fact that `!x[1]` means `!(x[1])`
// instead of `(!x)[1]` is handled by the fact that the parser
// function that parses unary prefix operators is called first, and
// in turn calls the function that parses `[]` subscripts — that
// way, it'll receive the node for `x[1]` already parsed, and wraps
// *that* in the unary operator node.
//
// Acorn uses an [operator precedence parser][opp] to handle binary
// operator precedence, because it is much more compact than using
// the technique outlined above, which uses different, nesting
// functions to specify precedence, for all of the ten binary
// precedence levels that JavaScript defines.
//
// [opp]: http://en.wikipedia.org/wiki/Operator-precedence_parser

"use strict";

var tt = _dereq_("./tokentype").types;

var Parser = _dereq_("./state").Parser;

var reservedWords = _dereq_("./identifier").reservedWords;

var has = _dereq_("./util").has;

var pp = Parser.prototype;

// Check if property name clashes with already added.
// Object/class getters and setters are not allowed to clash —
// either with each other or with an init property — and in
// strict mode, init properties are also not allowed to be repeated.

pp.checkPropClash = function (prop, propHash) {
  if (this.options.ecmaVersion >= 6) return;
  var key = prop.key,
      name = undefined;
  switch (key.type) {
    case "Identifier":
      name = key.name;break;
    case "Literal":
      name = String(key.value);break;
    default:
      return;
  }
  var kind = prop.kind || "init",
      other = undefined;
  if (has(propHash, name)) {
    other = propHash[name];
    var isGetSet = kind !== "init";
    if ((this.strict || isGetSet) && other[kind] || !(isGetSet ^ other.init)) this.raise(key.start, "Redefinition of property");
  } else {
    other = propHash[name] = {
      init: false,
      get: false,
      set: false
    };
  }
  other[kind] = true;
};

// ### Expression parsing

// These nest, from the most general expression type at the top to
// 'atomic', nondivisible expression types at the bottom. Most of
// the functions will simply let the function(s) below them parse,
// and, *if* the syntactic construct they handle is present, wrap
// the AST node that the inner parser gave them in another node.

// Parse a full expression. The optional arguments are used to
// forbid the `in` operator (in for loops initalization expressions)
// and provide reference for storing '=' operator inside shorthand
// property assignment in contexts where both object expression
// and object pattern might appear (so it's possible to raise
// delayed syntax error at correct position).

pp.parseExpression = function (noIn, refShorthandDefaultPos) {
  var startPos = this.start,
      startLoc = this.startLoc;
  var expr = this.parseMaybeAssign(noIn, refShorthandDefaultPos);
  if (this.type === tt.comma) {
    var node = this.startNodeAt(startPos, startLoc);
    node.expressions = [expr];
    while (this.eat(tt.comma)) node.expressions.push(this.parseMaybeAssign(noIn, refShorthandDefaultPos));
    return this.finishNode(node, "SequenceExpression");
  }
  return expr;
};

// Parse an assignment expression. This includes applications of
// operators like `+=`.

pp.parseMaybeAssign = function (noIn, refShorthandDefaultPos, afterLeftParse) {
  if (this.type == tt._yield && this.inGenerator) return this.parseYield();

  var failOnShorthandAssign = undefined;
  if (!refShorthandDefaultPos) {
    refShorthandDefaultPos = { start: 0 };
    failOnShorthandAssign = true;
  } else {
    failOnShorthandAssign = false;
  }
  var startPos = this.start,
      startLoc = this.startLoc;
  if (this.type == tt.parenL || this.type == tt.name) this.potentialArrowAt = this.start;
  var left = this.parseMaybeConditional(noIn, refShorthandDefaultPos);
  if (afterLeftParse) left = afterLeftParse.call(this, left, startPos, startLoc);
  if (this.type.isAssign) {
    var node = this.startNodeAt(startPos, startLoc);
    node.operator = this.value;
    node.left = this.type === tt.eq ? this.toAssignable(left) : left;
    refShorthandDefaultPos.start = 0; // reset because shorthand default was used correctly
    this.checkLVal(left);
    this.next();
    node.right = this.parseMaybeAssign(noIn);
    return this.finishNode(node, "AssignmentExpression");
  } else if (failOnShorthandAssign && refShorthandDefaultPos.start) {
    this.unexpected(refShorthandDefaultPos.start);
  }
  return left;
};

// Parse a ternary conditional (`?:`) operator.

pp.parseMaybeConditional = function (noIn, refShorthandDefaultPos) {
  var startPos = this.start,
      startLoc = this.startLoc;
  var expr = this.parseExprOps(noIn, refShorthandDefaultPos);
  if (refShorthandDefaultPos && refShorthandDefaultPos.start) return expr;
  if (this.eat(tt.question)) {
    var node = this.startNodeAt(startPos, startLoc);
    node.test = expr;
    node.consequent = this.parseMaybeAssign();
    this.expect(tt.colon);
    node.alternate = this.parseMaybeAssign(noIn);
    return this.finishNode(node, "ConditionalExpression");
  }
  return expr;
};

// Start the precedence parser.

pp.parseExprOps = function (noIn, refShorthandDefaultPos) {
  var startPos = this.start,
      startLoc = this.startLoc;
  var expr = this.parseMaybeUnary(refShorthandDefaultPos);
  if (refShorthandDefaultPos && refShorthandDefaultPos.start) return expr;
  return this.parseExprOp(expr, startPos, startLoc, -1, noIn);
};

// Parse binary operators with the operator precedence parsing
// algorithm. `left` is the left-hand side of the operator.
// `minPrec` provides context that allows the function to stop and
// defer further parser to one of its callers when it encounters an
// operator that has a lower precedence than the set it is parsing.

pp.parseExprOp = function (left, leftStartPos, leftStartLoc, minPrec, noIn) {
  var prec = this.type.binop;
  if (Array.isArray(leftStartPos)) {
    if (this.options.locations && noIn === undefined) {
      // shift arguments to left by one
      noIn = minPrec;
      minPrec = leftStartLoc;
      // flatten leftStartPos
      leftStartLoc = leftStartPos[1];
      leftStartPos = leftStartPos[0];
    }
  }
  if (prec != null && (!noIn || this.type !== tt._in)) {
    if (prec > minPrec) {
      var node = this.startNodeAt(leftStartPos, leftStartLoc);
      node.left = left;
      node.operator = this.value;
      var op = this.type;
      this.next();
      var startPos = this.start,
          startLoc = this.startLoc;
      node.right = this.parseExprOp(this.parseMaybeUnary(), startPos, startLoc, prec, noIn);
      this.finishNode(node, op === tt.logicalOR || op === tt.logicalAND ? "LogicalExpression" : "BinaryExpression");
      return this.parseExprOp(node, leftStartPos, leftStartLoc, minPrec, noIn);
    }
  }
  return left;
};

// Parse unary operators, both prefix and postfix.

pp.parseMaybeUnary = function (refShorthandDefaultPos) {
  if (this.type.prefix) {
    var node = this.startNode(),
        update = this.type === tt.incDec;
    node.operator = this.value;
    node.prefix = true;
    this.next();
    node.argument = this.parseMaybeUnary();
    if (refShorthandDefaultPos && refShorthandDefaultPos.start) this.unexpected(refShorthandDefaultPos.start);
    if (update) this.checkLVal(node.argument);else if (this.strict && node.operator === "delete" && node.argument.type === "Identifier") this.raise(node.start, "Deleting local variable in strict mode");
    return this.finishNode(node, update ? "UpdateExpression" : "UnaryExpression");
  }
  var startPos = this.start,
      startLoc = this.startLoc;
  var expr = this.parseExprSubscripts(refShorthandDefaultPos);
  if (refShorthandDefaultPos && refShorthandDefaultPos.start) return expr;
  while (this.type.postfix && !this.canInsertSemicolon()) {
    var node = this.startNodeAt(startPos, startLoc);
    node.operator = this.value;
    node.prefix = false;
    node.argument = expr;
    this.checkLVal(expr);
    this.next();
    expr = this.finishNode(node, "UpdateExpression");
  }
  return expr;
};

// Parse call, dot, and `[]`-subscript expressions.

pp.parseExprSubscripts = function (refShorthandDefaultPos) {
  var startPos = this.start,
      startLoc = this.startLoc;
  var expr = this.parseExprAtom(refShorthandDefaultPos);
  if (refShorthandDefaultPos && refShorthandDefaultPos.start) return expr;
  return this.parseSubscripts(expr, startPos, startLoc);
};

pp.parseSubscripts = function (base, startPos, startLoc, noCalls) {
  if (Array.isArray(startPos)) {
    if (this.options.locations && noCalls === undefined) {
      // shift arguments to left by one
      noCalls = startLoc;
      // flatten startPos
      startLoc = startPos[1];
      startPos = startPos[0];
    }
  }
  for (;;) {
    if (this.eat(tt.dot)) {
      var node = this.startNodeAt(startPos, startLoc);
      node.object = base;
      node.property = this.parseIdent(true);
      node.computed = false;
      base = this.finishNode(node, "MemberExpression");
    } else if (this.eat(tt.bracketL)) {
      var node = this.startNodeAt(startPos, startLoc);
      node.object = base;
      node.property = this.parseExpression();
      node.computed = true;
      this.expect(tt.bracketR);
      base = this.finishNode(node, "MemberExpression");
    } else if (!noCalls && this.eat(tt.parenL)) {
      var node = this.startNodeAt(startPos, startLoc);
      node.callee = base;
      node.arguments = this.parseExprList(tt.parenR, false);
      base = this.finishNode(node, "CallExpression");
    } else if (this.type === tt.backQuote) {
      var node = this.startNodeAt(startPos, startLoc);
      node.tag = base;
      node.quasi = this.parseTemplate();
      base = this.finishNode(node, "TaggedTemplateExpression");
    } else {
      return base;
    }
  }
};

// Parse an atomic expression — either a single token that is an
// expression, an expression started by a keyword like `function` or
// `new`, or an expression wrapped in punctuation like `()`, `[]`,
// or `{}`.

pp.parseExprAtom = function (refShorthandDefaultPos) {
  var node = undefined,
      canBeArrow = this.potentialArrowAt == this.start;
  switch (this.type) {
    case tt._this:
    case tt._super:
      var type = this.type === tt._this ? "ThisExpression" : "Super";
      node = this.startNode();
      this.next();
      return this.finishNode(node, type);

    case tt._yield:
      if (this.inGenerator) this.unexpected();

    case tt.name:
      var startPos = this.start,
          startLoc = this.startLoc;
      var id = this.parseIdent(this.type !== tt.name);
      if (canBeArrow && !this.canInsertSemicolon() && this.eat(tt.arrow)) return this.parseArrowExpression(this.startNodeAt(startPos, startLoc), [id]);
      return id;

    case tt.regexp:
      var value = this.value;
      node = this.parseLiteral(value.value);
      node.regex = { pattern: value.pattern, flags: value.flags };
      return node;

    case tt.num:case tt.string:
      return this.parseLiteral(this.value);

    case tt._null:case tt._true:case tt._false:
      node = this.startNode();
      node.value = this.type === tt._null ? null : this.type === tt._true;
      node.raw = this.type.keyword;
      this.next();
      return this.finishNode(node, "Literal");

    case tt.parenL:
      return this.parseParenAndDistinguishExpression(canBeArrow);

    case tt.bracketL:
      node = this.startNode();
      this.next();
      // check whether this is array comprehension or regular array
      if (this.options.ecmaVersion >= 7 && this.type === tt._for) {
        return this.parseComprehension(node, false);
      }
      node.elements = this.parseExprList(tt.bracketR, true, true, refShorthandDefaultPos);
      return this.finishNode(node, "ArrayExpression");

    case tt.braceL:
      return this.parseObj(false, refShorthandDefaultPos);

    case tt._function:
      node = this.startNode();
      this.next();
      return this.parseFunction(node, false);

    case tt._class:
      return this.parseClass(this.startNode(), false);

    case tt._new:
      return this.parseNew();

    case tt.backQuote:
      return this.parseTemplate();

    default:
      this.unexpected();
  }
};

pp.parseLiteral = function (value) {
  var node = this.startNode();
  node.value = value;
  node.raw = this.input.slice(this.start, this.end);
  this.next();
  return this.finishNode(node, "Literal");
};

pp.parseParenExpression = function () {
  this.expect(tt.parenL);
  var val = this.parseExpression();
  this.expect(tt.parenR);
  return val;
};

pp.parseParenAndDistinguishExpression = function (canBeArrow) {
  var startPos = this.start,
      startLoc = this.startLoc,
      val = undefined;
  if (this.options.ecmaVersion >= 6) {
    this.next();

    if (this.options.ecmaVersion >= 7 && this.type === tt._for) {
      return this.parseComprehension(this.startNodeAt(startPos, startLoc), true);
    }

    var innerStartPos = this.start,
        innerStartLoc = this.startLoc;
    var exprList = [],
        first = true;
    var refShorthandDefaultPos = { start: 0 },
        spreadStart = undefined,
        innerParenStart = undefined;
    while (this.type !== tt.parenR) {
      first ? first = false : this.expect(tt.comma);
      if (this.type === tt.ellipsis) {
        spreadStart = this.start;
        exprList.push(this.parseParenItem(this.parseRest()));
        break;
      } else {
        if (this.type === tt.parenL && !innerParenStart) {
          innerParenStart = this.start;
        }
        exprList.push(this.parseMaybeAssign(false, refShorthandDefaultPos, this.parseParenItem));
      }
    }
    var innerEndPos = this.start,
        innerEndLoc = this.startLoc;
    this.expect(tt.parenR);

    if (canBeArrow && !this.canInsertSemicolon() && this.eat(tt.arrow)) {
      if (innerParenStart) this.unexpected(innerParenStart);
      return this.parseParenArrowList(startPos, startLoc, exprList);
    }

    if (!exprList.length) this.unexpected(this.lastTokStart);
    if (spreadStart) this.unexpected(spreadStart);
    if (refShorthandDefaultPos.start) this.unexpected(refShorthandDefaultPos.start);

    if (exprList.length > 1) {
      val = this.startNodeAt(innerStartPos, innerStartLoc);
      val.expressions = exprList;
      this.finishNodeAt(val, "SequenceExpression", innerEndPos, innerEndLoc);
    } else {
      val = exprList[0];
    }
  } else {
    val = this.parseParenExpression();
  }

  if (this.options.preserveParens) {
    var par = this.startNodeAt(startPos, startLoc);
    par.expression = val;
    return this.finishNode(par, "ParenthesizedExpression");
  } else {
    return val;
  }
};

pp.parseParenItem = function (item) {
  return item;
};

pp.parseParenArrowList = function (startPos, startLoc, exprList) {
  return this.parseArrowExpression(this.startNodeAt(startPos, startLoc), exprList);
};

// New's precedence is slightly tricky. It must allow its argument
// to be a `[]` or dot subscript expression, but not a call — at
// least, not without wrapping it in parentheses. Thus, it uses the

var empty = [];

pp.parseNew = function () {
  var node = this.startNode();
  var meta = this.parseIdent(true);
  if (this.options.ecmaVersion >= 6 && this.eat(tt.dot)) {
    node.meta = meta;
    node.property = this.parseIdent(true);
    if (node.property.name !== "target") this.raise(node.property.start, "The only valid meta property for new is new.target");
    return this.finishNode(node, "MetaProperty");
  }
  var startPos = this.start,
      startLoc = this.startLoc;
  node.callee = this.parseSubscripts(this.parseExprAtom(), startPos, startLoc, true);
  if (this.eat(tt.parenL)) node.arguments = this.parseExprList(tt.parenR, false);else node.arguments = empty;
  return this.finishNode(node, "NewExpression");
};

// Parse template expression.

pp.parseTemplateElement = function () {
  var elem = this.startNode();
  elem.value = {
    raw: this.input.slice(this.start, this.end),
    cooked: this.value
  };
  this.next();
  elem.tail = this.type === tt.backQuote;
  return this.finishNode(elem, "TemplateElement");
};

pp.parseTemplate = function () {
  var node = this.startNode();
  this.next();
  node.expressions = [];
  var curElt = this.parseTemplateElement();
  node.quasis = [curElt];
  while (!curElt.tail) {
    this.expect(tt.dollarBraceL);
    node.expressions.push(this.parseExpression());
    this.expect(tt.braceR);
    node.quasis.push(curElt = this.parseTemplateElement());
  }
  this.next();
  return this.finishNode(node, "TemplateLiteral");
};

// Parse an object literal or binding pattern.

pp.parseObj = function (isPattern, refShorthandDefaultPos) {
  var node = this.startNode(),
      first = true,
      propHash = {};
  node.properties = [];
  this.next();
  while (!this.eat(tt.braceR)) {
    if (!first) {
      this.expect(tt.comma);
      if (this.afterTrailingComma(tt.braceR)) break;
    } else first = false;

    var prop = this.startNode(),
        isGenerator = undefined,
        startPos = undefined,
        startLoc = undefined;
    if (this.options.ecmaVersion >= 6) {
      prop.method = false;
      prop.shorthand = false;
      if (isPattern || refShorthandDefaultPos) {
        startPos = this.start;
        startLoc = this.startLoc;
      }
      if (!isPattern) isGenerator = this.eat(tt.star);
    }
    this.parsePropertyName(prop);
    this.parsePropertyValue(prop, isPattern, isGenerator, startPos, startLoc, refShorthandDefaultPos);
    this.checkPropClash(prop, propHash);
    node.properties.push(this.finishNode(prop, "Property"));
  }
  return this.finishNode(node, isPattern ? "ObjectPattern" : "ObjectExpression");
};

pp.parsePropertyValue = function (prop, isPattern, isGenerator, startPos, startLoc, refShorthandDefaultPos) {
  if (this.eat(tt.colon)) {
    prop.value = isPattern ? this.parseMaybeDefault(this.start, this.startLoc) : this.parseMaybeAssign(false, refShorthandDefaultPos);
    prop.kind = "init";
  } else if (this.options.ecmaVersion >= 6 && this.type === tt.parenL) {
    if (isPattern) this.unexpected();
    prop.kind = "init";
    prop.method = true;
    prop.value = this.parseMethod(isGenerator);
  } else if (this.options.ecmaVersion >= 5 && !prop.computed && prop.key.type === "Identifier" && (prop.key.name === "get" || prop.key.name === "set") && (this.type != tt.comma && this.type != tt.braceR)) {
    if (isGenerator || isPattern) this.unexpected();
    prop.kind = prop.key.name;
    this.parsePropertyName(prop);
    prop.value = this.parseMethod(false);
  } else if (this.options.ecmaVersion >= 6 && !prop.computed && prop.key.type === "Identifier") {
    prop.kind = "init";
    if (isPattern) {
      if (this.isKeyword(prop.key.name) || this.strict && (reservedWords.strictBind(prop.key.name) || reservedWords.strict(prop.key.name)) || !this.options.allowReserved && this.isReservedWord(prop.key.name)) this.raise(prop.key.start, "Binding " + prop.key.name);
      prop.value = this.parseMaybeDefault(startPos, startLoc, prop.key);
    } else if (this.type === tt.eq && refShorthandDefaultPos) {
      if (!refShorthandDefaultPos.start) refShorthandDefaultPos.start = this.start;
      prop.value = this.parseMaybeDefault(startPos, startLoc, prop.key);
    } else {
      prop.value = prop.key;
    }
    prop.shorthand = true;
  } else this.unexpected();
};

pp.parsePropertyName = function (prop) {
  if (this.options.ecmaVersion >= 6) {
    if (this.eat(tt.bracketL)) {
      prop.computed = true;
      prop.key = this.parseMaybeAssign();
      this.expect(tt.bracketR);
      return prop.key;
    } else {
      prop.computed = false;
    }
  }
  return prop.key = this.type === tt.num || this.type === tt.string ? this.parseExprAtom() : this.parseIdent(true);
};

// Initialize empty function node.

pp.initFunction = function (node) {
  node.id = null;
  if (this.options.ecmaVersion >= 6) {
    node.generator = false;
    node.expression = false;
  }
};

// Parse object or class method.

pp.parseMethod = function (isGenerator) {
  var node = this.startNode();
  this.initFunction(node);
  this.expect(tt.parenL);
  node.params = this.parseBindingList(tt.parenR, false, false);
  var allowExpressionBody = undefined;
  if (this.options.ecmaVersion >= 6) {
    node.generator = isGenerator;
    allowExpressionBody = true;
  } else {
    allowExpressionBody = false;
  }
  this.parseFunctionBody(node, allowExpressionBody);
  return this.finishNode(node, "FunctionExpression");
};

// Parse arrow function expression with given parameters.

pp.parseArrowExpression = function (node, params) {
  this.initFunction(node);
  node.params = this.toAssignableList(params, true);
  this.parseFunctionBody(node, true);
  return this.finishNode(node, "ArrowFunctionExpression");
};

// Parse function body and check parameters.

pp.parseFunctionBody = function (node, allowExpression) {
  var isExpression = allowExpression && this.type !== tt.braceL;

  if (isExpression) {
    node.body = this.parseMaybeAssign();
    node.expression = true;
  } else {
    // Start a new scope with regard to labels and the `inFunction`
    // flag (restore them to their old value afterwards).
    var oldInFunc = this.inFunction,
        oldInGen = this.inGenerator,
        oldLabels = this.labels;
    this.inFunction = true;this.inGenerator = node.generator;this.labels = [];
    node.body = this.parseBlock(true);
    node.expression = false;
    this.inFunction = oldInFunc;this.inGenerator = oldInGen;this.labels = oldLabels;
  }

  // If this is a strict mode function, verify that argument names
  // are not repeated, and it does not try to bind the words `eval`
  // or `arguments`.
  if (this.strict || !isExpression && node.body.body.length && this.isUseStrict(node.body.body[0])) {
    var nameHash = {},
        oldStrict = this.strict;
    this.strict = true;
    if (node.id) this.checkLVal(node.id, true);
    for (var i = 0; i < node.params.length; i++) {
      this.checkLVal(node.params[i], true, nameHash);
    }this.strict = oldStrict;
  }
};

// Parses a comma-separated list of expressions, and returns them as
// an array. `close` is the token type that ends the list, and
// `allowEmpty` can be turned on to allow subsequent commas with
// nothing in between them to be parsed as `null` (which is needed
// for array literals).

pp.parseExprList = function (close, allowTrailingComma, allowEmpty, refShorthandDefaultPos) {
  var elts = [],
      first = true;
  while (!this.eat(close)) {
    if (!first) {
      this.expect(tt.comma);
      if (allowTrailingComma && this.afterTrailingComma(close)) break;
    } else first = false;

    if (allowEmpty && this.type === tt.comma) {
      elts.push(null);
    } else {
      if (this.type === tt.ellipsis) elts.push(this.parseSpread(refShorthandDefaultPos));else elts.push(this.parseMaybeAssign(false, refShorthandDefaultPos));
    }
  }
  return elts;
};

// Parse the next token as an identifier. If `liberal` is true (used
// when parsing properties), it will also convert keywords into
// identifiers.

pp.parseIdent = function (liberal) {
  var node = this.startNode();
  if (liberal && this.options.allowReserved == "never") liberal = false;
  if (this.type === tt.name) {
    if (!liberal && (!this.options.allowReserved && this.isReservedWord(this.value) || this.strict && reservedWords.strict(this.value) && (this.options.ecmaVersion >= 6 || this.input.slice(this.start, this.end).indexOf("\\") == -1))) this.raise(this.start, "The keyword '" + this.value + "' is reserved");
    node.name = this.value;
  } else if (liberal && this.type.keyword) {
    node.name = this.type.keyword;
  } else {
    this.unexpected();
  }
  this.next();
  return this.finishNode(node, "Identifier");
};

// Parses yield expression inside generator.

pp.parseYield = function () {
  var node = this.startNode();
  this.next();
  if (this.type == tt.semi || this.canInsertSemicolon() || this.type != tt.star && !this.type.startsExpr) {
    node.delegate = false;
    node.argument = null;
  } else {
    node.delegate = this.eat(tt.star);
    node.argument = this.parseMaybeAssign();
  }
  return this.finishNode(node, "YieldExpression");
};

// Parses array and generator comprehensions.

pp.parseComprehension = function (node, isGenerator) {
  node.blocks = [];
  while (this.type === tt._for) {
    var block = this.startNode();
    this.next();
    this.expect(tt.parenL);
    block.left = this.parseBindingAtom();
    this.checkLVal(block.left, true);
    this.expectContextual("of");
    block.right = this.parseExpression();
    this.expect(tt.parenR);
    node.blocks.push(this.finishNode(block, "ComprehensionBlock"));
  }
  node.filter = this.eat(tt._if) ? this.parseParenExpression() : null;
  node.body = this.parseExpression();
  this.expect(isGenerator ? tt.parenR : tt.bracketR);
  node.generator = isGenerator;
  return this.finishNode(node, "ComprehensionExpression");
};

},{"./identifier":7,"./state":13,"./tokentype":17,"./util":18}],7:[function(_dereq_,module,exports){


// Test whether a given character code starts an identifier.

"use strict";

exports.isIdentifierStart = isIdentifierStart;

// Test whether a given character is part of an identifier.

exports.isIdentifierChar = isIdentifierChar;
exports.__esModule = true;
// This is a trick taken from Esprima. It turns out that, on
// non-Chrome browsers, to check whether a string is in a set, a
// predicate containing a big ugly `switch` statement is faster than
// a regular expression, and on Chrome the two are about on par.
// This function uses `eval` (non-lexical) to produce such a
// predicate from a space-separated string of words.
//
// It starts by sorting the words by length.

function makePredicate(words) {
  words = words.split(" ");
  var f = "",
      cats = [];
  out: for (var i = 0; i < words.length; ++i) {
    for (var j = 0; j < cats.length; ++j) {
      if (cats[j][0].length == words[i].length) {
        cats[j].push(words[i]);
        continue out;
      }
    }cats.push([words[i]]);
  }
  function compareTo(arr) {
    if (arr.length == 1) {
      return f += "return str === " + JSON.stringify(arr[0]) + ";";
    }f += "switch(str){";
    for (var i = 0; i < arr.length; ++i) {
      f += "case " + JSON.stringify(arr[i]) + ":";
    }f += "return true}return false;";
  }

  // When there are more than three length categories, an outer
  // switch first dispatches on the lengths, to save on comparisons.

  if (cats.length > 3) {
    cats.sort(function (a, b) {
      return b.length - a.length;
    });
    f += "switch(str.length){";
    for (var i = 0; i < cats.length; ++i) {
      var cat = cats[i];
      f += "case " + cat[0].length + ":";
      compareTo(cat);
    }
    f += "}"

    // Otherwise, simply generate a flat `switch` statement.

    ;
  } else {
    compareTo(words);
  }
  return new Function("str", f);
}

// Reserved word lists for various dialects of the language

var reservedWords = {
  3: makePredicate("abstract boolean byte char class double enum export extends final float goto implements import int interface long native package private protected public short static super synchronized throws transient volatile"),
  5: makePredicate("class enum extends super const export import"),
  6: makePredicate("enum await"),
  strict: makePredicate("implements interface let package private protected public static yield"),
  strictBind: makePredicate("eval arguments")
};

exports.reservedWords = reservedWords;
// And the keywords

var ecma5AndLessKeywords = "break case catch continue debugger default do else finally for function if return switch throw try var while with null true false instanceof typeof void delete new in this";

var keywords = {
  5: makePredicate(ecma5AndLessKeywords),
  6: makePredicate(ecma5AndLessKeywords + " let const class extends export import yield super")
};

exports.keywords = keywords;
// ## Character categories

// Big ugly regular expressions that match characters in the
// whitespace, identifier, and identifier-start categories. These
// are only applied when a character is found to actually have a
// code point above 128.
// Generated by `tools/generate-identifier-regex.js`.

var nonASCIIidentifierStartChars = "ªµºÀ-ÖØ-öø-ˁˆ-ˑˠ-ˤˬˮͰ-ʹͶͷͺ-ͽͿΆΈ-ΊΌΎ-ΡΣ-ϵϷ-ҁҊ-ԯԱ-Ֆՙա-ևא-תװ-ײؠ-يٮٯٱ-ۓەۥۦۮۯۺ-ۼۿܐܒ-ܯݍ-ޥޱߊ-ߪߴߵߺࠀ-ࠕࠚࠤࠨࡀ-ࡘࢠ-ࢲऄ-हऽॐक़-ॡॱ-ঀঅ-ঌএঐও-নপ-রলশ-হঽৎড়ঢ়য়-ৡৰৱਅ-ਊਏਐਓ-ਨਪ-ਰਲਲ਼ਵਸ਼ਸਹਖ਼-ੜਫ਼ੲ-ੴઅ-ઍએ-ઑઓ-નપ-રલળવ-હઽૐૠૡଅ-ଌଏଐଓ-ନପ-ରଲଳଵ-ହଽଡ଼ଢ଼ୟ-ୡୱஃஅ-ஊஎ-ஐஒ-கஙசஜஞடணதந-பம-ஹௐఅ-ఌఎ-ఐఒ-నప-హఽౘౙౠౡಅ-ಌಎ-ಐಒ-ನಪ-ಳವ-ಹಽೞೠೡೱೲഅ-ഌഎ-ഐഒ-ഺഽൎൠൡൺ-ൿඅ-ඖක-නඳ-රලව-ෆก-ะาำเ-ๆກຂຄງຈຊຍດ-ທນ-ຟມ-ຣລວສຫອ-ະາຳຽເ-ໄໆໜ-ໟༀཀ-ཇཉ-ཬྈ-ྌက-ဪဿၐ-ၕၚ-ၝၡၥၦၮ-ၰၵ-ႁႎႠ-ჅჇჍა-ჺჼ-ቈቊ-ቍቐ-ቖቘቚ-ቝበ-ኈኊ-ኍነ-ኰኲ-ኵኸ-ኾዀዂ-ዅወ-ዖዘ-ጐጒ-ጕጘ-ፚᎀ-ᎏᎠ-Ᏼᐁ-ᙬᙯ-ᙿᚁ-ᚚᚠ-ᛪᛮ-ᛸᜀ-ᜌᜎ-ᜑᜠ-ᜱᝀ-ᝑᝠ-ᝬᝮ-ᝰក-ឳៗៜᠠ-ᡷᢀ-ᢨᢪᢰ-ᣵᤀ-ᤞᥐ-ᥭᥰ-ᥴᦀ-ᦫᧁ-ᧇᨀ-ᨖᨠ-ᩔᪧᬅ-ᬳᭅ-ᭋᮃ-ᮠᮮᮯᮺ-ᯥᰀ-ᰣᱍ-ᱏᱚ-ᱽᳩ-ᳬᳮ-ᳱᳵᳶᴀ-ᶿḀ-ἕἘ-Ἕἠ-ὅὈ-Ὅὐ-ὗὙὛὝὟ-ώᾀ-ᾴᾶ-ᾼιῂ-ῄῆ-ῌῐ-ΐῖ-Ίῠ-Ῥῲ-ῴῶ-ῼⁱⁿₐ-ₜℂℇℊ-ℓℕ℘-ℝℤΩℨK-ℹℼ-ℿⅅ-ⅉⅎⅠ-ↈⰀ-Ⱞⰰ-ⱞⱠ-ⳤⳫ-ⳮⳲⳳⴀ-ⴥⴧⴭⴰ-ⵧⵯⶀ-ⶖⶠ-ⶦⶨ-ⶮⶰ-ⶶⶸ-ⶾⷀ-ⷆⷈ-ⷎⷐ-ⷖⷘ-ⷞ々-〇〡-〩〱-〵〸-〼ぁ-ゖ゛-ゟァ-ヺー-ヿㄅ-ㄭㄱ-ㆎㆠ-ㆺㇰ-ㇿ㐀-䶵一-鿌ꀀ-ꒌꓐ-ꓽꔀ-ꘌꘐ-ꘟꘪꘫꙀ-ꙮꙿ-ꚝꚠ-ꛯꜗ-ꜟꜢ-ꞈꞋ-ꞎꞐ-ꞭꞰꞱꟷ-ꠁꠃ-ꠅꠇ-ꠊꠌ-ꠢꡀ-ꡳꢂ-ꢳꣲ-ꣷꣻꤊ-ꤥꤰ-ꥆꥠ-ꥼꦄ-ꦲꧏꧠ-ꧤꧦ-ꧯꧺ-ꧾꨀ-ꨨꩀ-ꩂꩄ-ꩋꩠ-ꩶꩺꩾ-ꪯꪱꪵꪶꪹ-ꪽꫀꫂꫛ-ꫝꫠ-ꫪꫲ-ꫴꬁ-ꬆꬉ-ꬎꬑ-ꬖꬠ-ꬦꬨ-ꬮꬰ-ꭚꭜ-ꭟꭤꭥꯀ-ꯢ가-힣ힰ-ퟆퟋ-ퟻ豈-舘並-龎ff-stﬓ-ﬗיִײַ-ﬨשׁ-זּטּ-לּמּנּסּףּפּצּ-ﮱﯓ-ﴽﵐ-ﶏﶒ-ﷇﷰ-ﷻﹰ-ﹴﹶ-ﻼＡ-Ｚａ-ｚｦ-ﾾￂ-ￇￊ-ￏￒ-ￗￚ-ￜ";
var nonASCIIidentifierChars = "‌‍·̀-ͯ·҃-֑҇-ׇֽֿׁׂׅׄؐ-ًؚ-٩ٰۖ-ۜ۟-۪ۤۧۨ-ۭ۰-۹ܑܰ-݊ަ-ް߀-߉߫-߳ࠖ-࠙ࠛ-ࠣࠥ-ࠧࠩ-࡙࠭-࡛ࣤ-ःऺ-़ा-ॏ॑-ॗॢॣ०-९ঁ-ঃ়া-ৄেৈো-্ৗৢৣ০-৯ਁ-ਃ਼ਾ-ੂੇੈੋ-੍ੑ੦-ੱੵઁ-ઃ઼ા-ૅે-ૉો-્ૢૣ૦-૯ଁ-ଃ଼ା-ୄେୈୋ-୍ୖୗୢୣ୦-୯ஂா-ூெ-ைொ-்ௗ௦-௯ఀ-ఃా-ౄె-ైొ-్ౕౖౢౣ౦-౯ಁ-ಃ಼ಾ-ೄೆ-ೈೊ-್ೕೖೢೣ೦-೯ഁ-ഃാ-ൄെ-ൈൊ-്ൗൢൣ൦-൯ංඃ්ා-ුූෘ-ෟ෦-෯ෲෳัิ-ฺ็-๎๐-๙ັິ-ູົຼ່-ໍ໐-໙༘༙༠-༩༹༵༷༾༿ཱ-྄྆྇ྍ-ྗྙ-ྼ࿆ါ-ှ၀-၉ၖ-ၙၞ-ၠၢ-ၤၧ-ၭၱ-ၴႂ-ႍႏ-ႝ፝-፟፩-፱ᜒ-᜔ᜲ-᜴ᝒᝓᝲᝳ឴-៓៝០-៩᠋-᠍᠐-᠙ᢩᤠ-ᤫᤰ-᤻᥆-᥏ᦰ-ᧀᧈᧉ᧐-᧚ᨗ-ᨛᩕ-ᩞ᩠-᩿᩼-᪉᪐-᪙᪰-᪽ᬀ-ᬄ᬴-᭄᭐-᭙᭫-᭳ᮀ-ᮂᮡ-ᮭ᮰-᮹᯦-᯳ᰤ-᰷᱀-᱉᱐-᱙᳐-᳔᳒-᳨᳭ᳲ-᳴᳸᳹᷀-᷵᷼-᷿‿⁀⁔⃐-⃥⃜⃡-⃰⳯-⵿⳱ⷠ-〪ⷿ-゙゚〯꘠-꘩꙯ꙴ-꙽ꚟ꛰꛱ꠂ꠆ꠋꠣ-ꠧꢀꢁꢴ-꣄꣐-꣙꣠-꣱꤀-꤉ꤦ-꤭ꥇ-꥓ꦀ-ꦃ꦳-꧀꧐-꧙ꧥ꧰-꧹ꨩ-ꨶꩃꩌꩍ꩐-꩙ꩻ-ꩽꪰꪲ-ꪴꪷꪸꪾ꪿꫁ꫫ-ꫯꫵ꫶ꯣ-ꯪ꯬꯭꯰-꯹ﬞ︀-️︠-︭︳︴﹍-﹏０-９＿";

var nonASCIIidentifierStart = new RegExp("[" + nonASCIIidentifierStartChars + "]");
var nonASCIIidentifier = new RegExp("[" + nonASCIIidentifierStartChars + nonASCIIidentifierChars + "]");

nonASCIIidentifierStartChars = nonASCIIidentifierChars = null;

// These are a run-length and offset encoded representation of the
// >0xffff code points that are a valid part of identifiers. The
// offset starts at 0x10000, and each pair of numbers represents an
// offset to the next range, and then a size of the range. They were
// generated by tools/generate-identifier-regex.js
var astralIdentifierStartCodes = [0, 11, 2, 25, 2, 18, 2, 1, 2, 14, 3, 13, 35, 122, 70, 52, 268, 28, 4, 48, 48, 31, 17, 26, 6, 37, 11, 29, 3, 35, 5, 7, 2, 4, 43, 157, 99, 39, 9, 51, 157, 310, 10, 21, 11, 7, 153, 5, 3, 0, 2, 43, 2, 1, 4, 0, 3, 22, 11, 22, 10, 30, 98, 21, 11, 25, 71, 55, 7, 1, 65, 0, 16, 3, 2, 2, 2, 26, 45, 28, 4, 28, 36, 7, 2, 27, 28, 53, 11, 21, 11, 18, 14, 17, 111, 72, 955, 52, 76, 44, 33, 24, 27, 35, 42, 34, 4, 0, 13, 47, 15, 3, 22, 0, 38, 17, 2, 24, 133, 46, 39, 7, 3, 1, 3, 21, 2, 6, 2, 1, 2, 4, 4, 0, 32, 4, 287, 47, 21, 1, 2, 0, 185, 46, 82, 47, 21, 0, 60, 42, 502, 63, 32, 0, 449, 56, 1288, 920, 104, 110, 2962, 1070, 13266, 568, 8, 30, 114, 29, 19, 47, 17, 3, 32, 20, 6, 18, 881, 68, 12, 0, 67, 12, 16481, 1, 3071, 106, 6, 12, 4, 8, 8, 9, 5991, 84, 2, 70, 2, 1, 3, 0, 3, 1, 3, 3, 2, 11, 2, 0, 2, 6, 2, 64, 2, 3, 3, 7, 2, 6, 2, 27, 2, 3, 2, 4, 2, 0, 4, 6, 2, 339, 3, 24, 2, 24, 2, 30, 2, 24, 2, 30, 2, 24, 2, 30, 2, 24, 2, 30, 2, 24, 2, 7, 4149, 196, 1340, 3, 2, 26, 2, 1, 2, 0, 3, 0, 2, 9, 2, 3, 2, 0, 2, 0, 7, 0, 5, 0, 2, 0, 2, 0, 2, 2, 2, 1, 2, 0, 3, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 1, 2, 0, 3, 3, 2, 6, 2, 3, 2, 3, 2, 0, 2, 9, 2, 16, 6, 2, 2, 4, 2, 16, 4421, 42710, 42, 4148, 12, 221, 16355, 541];
var astralIdentifierCodes = [509, 0, 227, 0, 150, 4, 294, 9, 1368, 2, 2, 1, 6, 3, 41, 2, 5, 0, 166, 1, 1306, 2, 54, 14, 32, 9, 16, 3, 46, 10, 54, 9, 7, 2, 37, 13, 2, 9, 52, 0, 13, 2, 49, 13, 16, 9, 83, 11, 168, 11, 6, 9, 8, 2, 57, 0, 2, 6, 3, 1, 3, 2, 10, 0, 11, 1, 3, 6, 4, 4, 316, 19, 13, 9, 214, 6, 3, 8, 112, 16, 16, 9, 82, 12, 9, 9, 535, 9, 20855, 9, 135, 4, 60, 6, 26, 9, 1016, 45, 17, 3, 19723, 1, 5319, 4, 4, 5, 9, 7, 3, 6, 31, 3, 149, 2, 1418, 49, 4305, 6, 792618, 239];

// This has a complexity linear to the value of the code. The
// assumption is that looking up astral identifier characters is
// rare.
function isInAstralSet(code, set) {
  var pos = 65536;
  for (var i = 0; i < set.length; i += 2) {
    pos += set[i];
    if (pos > code) {
      return false;
    }pos += set[i + 1];
    if (pos >= code) {
      return true;
    }
  }
}
function isIdentifierStart(code, astral) {
  if (code < 65) {
    return code === 36;
  }if (code < 91) {
    return true;
  }if (code < 97) {
    return code === 95;
  }if (code < 123) {
    return true;
  }if (code <= 65535) {
    return code >= 170 && nonASCIIidentifierStart.test(String.fromCharCode(code));
  }if (astral === false) {
    return false;
  }return isInAstralSet(code, astralIdentifierStartCodes);
}

function isIdentifierChar(code, astral) {
  if (code < 48) {
    return code === 36;
  }if (code < 58) {
    return true;
  }if (code < 65) {
    return false;
  }if (code < 91) {
    return true;
  }if (code < 97) {
    return code === 95;
  }if (code < 123) {
    return true;
  }if (code <= 65535) {
    return code >= 170 && nonASCIIidentifier.test(String.fromCharCode(code));
  }if (astral === false) {
    return false;
  }return isInAstralSet(code, astralIdentifierStartCodes) || isInAstralSet(code, astralIdentifierCodes);
}

},{}],8:[function(_dereq_,module,exports){
"use strict";

var _classCallCheck = function (instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } };

// The `getLineInfo` function is mostly useful when the
// `locations` option is off (for performance reasons) and you
// want to find the line/column position for a given character
// offset. `input` should be the code string that the offset refers
// into.

exports.getLineInfo = getLineInfo;
exports.__esModule = true;

var Parser = _dereq_("./state").Parser;

var lineBreakG = _dereq_("./whitespace").lineBreakG;

var deprecate = _dereq_("util").deprecate;

// These are used when `options.locations` is on, for the
// `startLoc` and `endLoc` properties.

var Position = exports.Position = (function () {
  function Position(line, col) {
    _classCallCheck(this, Position);

    this.line = line;
    this.column = col;
  }

  Position.prototype.offset = function offset(n) {
    return new Position(this.line, this.column + n);
  };

  return Position;
})();

var SourceLocation = exports.SourceLocation = function SourceLocation(p, start, end) {
  _classCallCheck(this, SourceLocation);

  this.start = start;
  this.end = end;
  if (p.sourceFile !== null) this.source = p.sourceFile;
};

function getLineInfo(input, offset) {
  for (var line = 1, cur = 0;;) {
    lineBreakG.lastIndex = cur;
    var match = lineBreakG.exec(input);
    if (match && match.index < offset) {
      ++line;
      cur = match.index + match[0].length;
    } else {
      return new Position(line, offset - cur);
    }
  }
}

var pp = Parser.prototype;

// This function is used to raise exceptions on parse errors. It
// takes an offset integer (into the current `input`) to indicate
// the location of the error, attaches the position to the end
// of the error message, and then raises a `SyntaxError` with that
// message.

pp.raise = function (pos, message) {
  var loc = getLineInfo(this.input, pos);
  message += " (" + loc.line + ":" + loc.column + ")";
  var err = new SyntaxError(message);
  err.pos = pos;err.loc = loc;err.raisedAt = this.pos;
  throw err;
};

pp.curPosition = function () {
  return new Position(this.curLine, this.pos - this.lineStart);
};

pp.markPosition = function () {
  return this.options.locations ? [this.start, this.startLoc] : this.start;
};

},{"./state":13,"./whitespace":19,"util":5}],9:[function(_dereq_,module,exports){
"use strict";

var tt = _dereq_("./tokentype").types;

var Parser = _dereq_("./state").Parser;

var reservedWords = _dereq_("./identifier").reservedWords;

var has = _dereq_("./util").has;

var pp = Parser.prototype;

// Convert existing expression atom to assignable pattern
// if possible.

pp.toAssignable = function (node, isBinding) {
  if (this.options.ecmaVersion >= 6 && node) {
    switch (node.type) {
      case "Identifier":
      case "ObjectPattern":
      case "ArrayPattern":
      case "AssignmentPattern":
        break;

      case "ObjectExpression":
        node.type = "ObjectPattern";
        for (var i = 0; i < node.properties.length; i++) {
          var prop = node.properties[i];
          if (prop.kind !== "init") this.raise(prop.key.start, "Object pattern can't contain getter or setter");
          this.toAssignable(prop.value, isBinding);
        }
        break;

      case "ArrayExpression":
        node.type = "ArrayPattern";
        this.toAssignableList(node.elements, isBinding);
        break;

      case "AssignmentExpression":
        if (node.operator === "=") {
          node.type = "AssignmentPattern";
        } else {
          this.raise(node.left.end, "Only '=' operator can be used for specifying default value.");
        }
        break;

      case "ParenthesizedExpression":
        node.expression = this.toAssignable(node.expression, isBinding);
        break;

      case "MemberExpression":
        if (!isBinding) break;

      default:
        this.raise(node.start, "Assigning to rvalue");
    }
  }
  return node;
};

// Convert list of expression atoms to binding list.

pp.toAssignableList = function (exprList, isBinding) {
  var end = exprList.length;
  if (end) {
    var last = exprList[end - 1];
    if (last && last.type == "RestElement") {
      --end;
    } else if (last && last.type == "SpreadElement") {
      last.type = "RestElement";
      var arg = last.argument;
      this.toAssignable(arg, isBinding);
      if (arg.type !== "Identifier" && arg.type !== "MemberExpression" && arg.type !== "ArrayPattern") this.unexpected(arg.start);
      --end;
    }
  }
  for (var i = 0; i < end; i++) {
    var elt = exprList[i];
    if (elt) this.toAssignable(elt, isBinding);
  }
  return exprList;
};

// Parses spread element.

pp.parseSpread = function (refShorthandDefaultPos) {
  var node = this.startNode();
  this.next();
  node.argument = this.parseMaybeAssign(refShorthandDefaultPos);
  return this.finishNode(node, "SpreadElement");
};

pp.parseRest = function () {
  var node = this.startNode();
  this.next();
  node.argument = this.type === tt.name || this.type === tt.bracketL ? this.parseBindingAtom() : this.unexpected();
  return this.finishNode(node, "RestElement");
};

// Parses lvalue (assignable) atom.

pp.parseBindingAtom = function () {
  if (this.options.ecmaVersion < 6) return this.parseIdent();
  switch (this.type) {
    case tt.name:
      return this.parseIdent();

    case tt.bracketL:
      var node = this.startNode();
      this.next();
      node.elements = this.parseBindingList(tt.bracketR, true, true);
      return this.finishNode(node, "ArrayPattern");

    case tt.braceL:
      return this.parseObj(true);

    default:
      this.unexpected();
  }
};

pp.parseBindingList = function (close, allowEmpty, allowTrailingComma) {
  var elts = [],
      first = true;
  while (!this.eat(close)) {
    if (first) first = false;else this.expect(tt.comma);
    if (allowEmpty && this.type === tt.comma) {
      elts.push(null);
    } else if (allowTrailingComma && this.afterTrailingComma(close)) {
      break;
    } else if (this.type === tt.ellipsis) {
      var rest = this.parseRest();
      this.parseBindingListItem(rest);
      elts.push(rest);
      this.expect(close);
      break;
    } else {
      var elem = this.parseMaybeDefault(this.start, this.startLoc);
      this.parseBindingListItem(elem);
      elts.push(elem);
    }
  }
  return elts;
};

pp.parseBindingListItem = function (param) {
  return param;
};

// Parses assignment pattern around given atom if possible.

pp.parseMaybeDefault = function (startPos, startLoc, left) {
  if (Array.isArray(startPos)) {
    if (this.options.locations && noCalls === undefined) {
      // shift arguments to left by one
      left = startLoc;
      // flatten startPos
      startLoc = startPos[1];
      startPos = startPos[0];
    }
  }
  left = left || this.parseBindingAtom();
  if (!this.eat(tt.eq)) return left;
  var node = this.startNodeAt(startPos, startLoc);
  node.operator = "=";
  node.left = left;
  node.right = this.parseMaybeAssign();
  return this.finishNode(node, "AssignmentPattern");
};

// Verify that a node is an lval — something that can be assigned
// to.

pp.checkLVal = function (expr, isBinding, checkClashes) {
  switch (expr.type) {
    case "Identifier":
      if (this.strict && (reservedWords.strictBind(expr.name) || reservedWords.strict(expr.name))) this.raise(expr.start, (isBinding ? "Binding " : "Assigning to ") + expr.name + " in strict mode");
      if (checkClashes) {
        if (has(checkClashes, expr.name)) this.raise(expr.start, "Argument name clash in strict mode");
        checkClashes[expr.name] = true;
      }
      break;

    case "MemberExpression":
      if (isBinding) this.raise(expr.start, (isBinding ? "Binding" : "Assigning to") + " member expression");
      break;

    case "ObjectPattern":
      for (var i = 0; i < expr.properties.length; i++) {
        this.checkLVal(expr.properties[i].value, isBinding, checkClashes);
      }break;

    case "ArrayPattern":
      for (var i = 0; i < expr.elements.length; i++) {
        var elem = expr.elements[i];
        if (elem) this.checkLVal(elem, isBinding, checkClashes);
      }
      break;

    case "AssignmentPattern":
      this.checkLVal(expr.left, isBinding, checkClashes);
      break;

    case "RestElement":
      this.checkLVal(expr.argument, isBinding, checkClashes);
      break;

    case "ParenthesizedExpression":
      this.checkLVal(expr.expression, isBinding, checkClashes);
      break;

    default:
      this.raise(expr.start, (isBinding ? "Binding" : "Assigning to") + " rvalue");
  }
};

},{"./identifier":7,"./state":13,"./tokentype":17,"./util":18}],10:[function(_dereq_,module,exports){
"use strict";

var _classCallCheck = function (instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } };

exports.__esModule = true;

var Parser = _dereq_("./state").Parser;

var SourceLocation = _dereq_("./location").SourceLocation;

// Start an AST node, attaching a start offset.

var pp = Parser.prototype;

var Node = exports.Node = function Node() {
  _classCallCheck(this, Node);
};

pp.startNode = function () {
  var node = new Node();
  node.start = this.start;
  if (this.options.locations) node.loc = new SourceLocation(this, this.startLoc);
  if (this.options.directSourceFile) node.sourceFile = this.options.directSourceFile;
  if (this.options.ranges) node.range = [this.start, 0];
  return node;
};

pp.startNodeAt = function (pos, loc) {
  var node = new Node();
  if (Array.isArray(pos)) {
    if (this.options.locations && loc === undefined) {
      // flatten pos
      loc = pos[1];
      pos = pos[0];
    }
  }
  node.start = pos;
  if (this.options.locations) node.loc = new SourceLocation(this, loc);
  if (this.options.directSourceFile) node.sourceFile = this.options.directSourceFile;
  if (this.options.ranges) node.range = [pos, 0];
  return node;
};

// Finish an AST node, adding `type` and `end` properties.

pp.finishNode = function (node, type) {
  node.type = type;
  node.end = this.lastTokEnd;
  if (this.options.locations) node.loc.end = this.lastTokEndLoc;
  if (this.options.ranges) node.range[1] = this.lastTokEnd;
  return node;
};

// Finish node at given position

pp.finishNodeAt = function (node, type, pos, loc) {
  node.type = type;
  if (Array.isArray(pos)) {
    if (this.options.locations && loc === undefined) {
      // flatten pos
      loc = pos[1];
      pos = pos[0];
    }
  }
  node.end = pos;
  if (this.options.locations) node.loc.end = loc;
  if (this.options.ranges) node.range[1] = pos;
  return node;
};

},{"./location":8,"./state":13}],11:[function(_dereq_,module,exports){


// Interpret and default an options object

"use strict";

exports.getOptions = getOptions;
exports.__esModule = true;

var _util = _dereq_("./util");

var has = _util.has;
var isArray = _util.isArray;

var SourceLocation = _dereq_("./location").SourceLocation;

// A second optional argument can be given to further configure
// the parser process. These options are recognized:

var defaultOptions = {
  // `ecmaVersion` indicates the ECMAScript version to parse. Must
  // be either 3, or 5, or 6. This influences support for strict
  // mode, the set of reserved words, support for getters and
  // setters and other features.
  ecmaVersion: 5,
  // Source type ("script" or "module") for different semantics
  sourceType: "script",
  // `onInsertedSemicolon` can be a callback that will be called
  // when a semicolon is automatically inserted. It will be passed
  // th position of the comma as an offset, and if `locations` is
  // enabled, it is given the location as a `{line, column}` object
  // as second argument.
  onInsertedSemicolon: null,
  // `onTrailingComma` is similar to `onInsertedSemicolon`, but for
  // trailing commas.
  onTrailingComma: null,
  // By default, reserved words are not enforced. Disable
  // `allowReserved` to enforce them. When this option has the
  // value "never", reserved words and keywords can also not be
  // used as property names.
  allowReserved: true,
  // When enabled, a return at the top level is not considered an
  // error.
  allowReturnOutsideFunction: false,
  // When enabled, import/export statements are not constrained to
  // appearing at the top of the program.
  allowImportExportEverywhere: false,
  // When enabled, hashbang directive in the beginning of file
  // is allowed and treated as a line comment.
  allowHashBang: false,
  // When `locations` is on, `loc` properties holding objects with
  // `start` and `end` properties in `{line, column}` form (with
  // line being 1-based and column 0-based) will be attached to the
  // nodes.
  locations: false,
  // A function can be passed as `onToken` option, which will
  // cause Acorn to call that function with object in the same
  // format as tokenize() returns. Note that you are not
  // allowed to call the parser from the callback—that will
  // corrupt its internal state.
  onToken: null,
  // A function can be passed as `onComment` option, which will
  // cause Acorn to call that function with `(block, text, start,
  // end)` parameters whenever a comment is skipped. `block` is a
  // boolean indicating whether this is a block (`/* */`) comment,
  // `text` is the content of the comment, and `start` and `end` are
  // character offsets that denote the start and end of the comment.
  // When the `locations` option is on, two more parameters are
  // passed, the full `{line, column}` locations of the start and
  // end of the comments. Note that you are not allowed to call the
  // parser from the callback—that will corrupt its internal state.
  onComment: null,
  // Nodes have their start and end characters offsets recorded in
  // `start` and `end` properties (directly on the node, rather than
  // the `loc` object, which holds line/column data. To also add a
  // [semi-standardized][range] `range` property holding a `[start,
  // end]` array with the same numbers, set the `ranges` option to
  // `true`.
  //
  // [range]: https://bugzilla.mozilla.org/show_bug.cgi?id=745678
  ranges: false,
  // It is possible to parse multiple files into a single AST by
  // passing the tree produced by parsing the first file as
  // `program` option in subsequent parses. This will add the
  // toplevel forms of the parsed file to the `Program` (top) node
  // of an existing parse tree.
  program: null,
  // When `locations` is on, you can pass this to record the source
  // file in every node's `loc` object.
  sourceFile: null,
  // This value, if given, is stored in every node, whether
  // `locations` is on or off.
  directSourceFile: null,
  // When enabled, parenthesized expressions are represented by
  // (non-standard) ParenthesizedExpression nodes
  preserveParens: false,
  plugins: {}
};exports.defaultOptions = defaultOptions;

function getOptions(opts) {
  var options = {};
  for (var opt in defaultOptions) {
    options[opt] = opts && has(opts, opt) ? opts[opt] : defaultOptions[opt];
  }if (isArray(options.onToken)) {
    (function () {
      var tokens = options.onToken;
      options.onToken = function (token) {
        return tokens.push(token);
      };
    })();
  }
  if (isArray(options.onComment)) options.onComment = pushComment(options, options.onComment);

  return options;
}

function pushComment(options, array) {
  return function (block, text, start, end, startLoc, endLoc) {
    var comment = {
      type: block ? "Block" : "Line",
      value: text,
      start: start,
      end: end
    };
    if (options.locations) comment.loc = new SourceLocation(this, startLoc, endLoc);
    if (options.ranges) comment.range = [start, end];
    array.push(comment);
  };
}

},{"./location":8,"./util":18}],12:[function(_dereq_,module,exports){
"use strict";

var tt = _dereq_("./tokentype").types;

var Parser = _dereq_("./state").Parser;

var lineBreak = _dereq_("./whitespace").lineBreak;

var pp = Parser.prototype;

// ## Parser utilities

// Test whether a statement node is the string literal `"use strict"`.

pp.isUseStrict = function (stmt) {
  return this.options.ecmaVersion >= 5 && stmt.type === "ExpressionStatement" && stmt.expression.type === "Literal" && stmt.expression.value === "use strict";
};

// Predicate that tests whether the next token is of the given
// type, and if yes, consumes it as a side effect.

pp.eat = function (type) {
  if (this.type === type) {
    this.next();
    return true;
  } else {
    return false;
  }
};

// Tests whether parsed token is a contextual keyword.

pp.isContextual = function (name) {
  return this.type === tt.name && this.value === name;
};

// Consumes contextual keyword if possible.

pp.eatContextual = function (name) {
  return this.value === name && this.eat(tt.name);
};

// Asserts that following token is given contextual keyword.

pp.expectContextual = function (name) {
  if (!this.eatContextual(name)) this.unexpected();
};

// Test whether a semicolon can be inserted at the current position.

pp.canInsertSemicolon = function () {
  return this.type === tt.eof || this.type === tt.braceR || lineBreak.test(this.input.slice(this.lastTokEnd, this.start));
};

pp.insertSemicolon = function () {
  if (this.canInsertSemicolon()) {
    if (this.options.onInsertedSemicolon) this.options.onInsertedSemicolon(this.lastTokEnd, this.lastTokEndLoc);
    return true;
  }
};

// Consume a semicolon, or, failing that, see if we are allowed to
// pretend that there is a semicolon at this position.

pp.semicolon = function () {
  if (!this.eat(tt.semi) && !this.insertSemicolon()) this.unexpected();
};

pp.afterTrailingComma = function (tokType) {
  if (this.type == tokType) {
    if (this.options.onTrailingComma) this.options.onTrailingComma(this.lastTokStart, this.lastTokStartLoc);
    this.next();
    return true;
  }
};

// Expect a token of a given type. If found, consume it, otherwise,
// raise an unexpected token error.

pp.expect = function (type) {
  this.eat(type) || this.unexpected();
};

// Raise an unexpected token error.

pp.unexpected = function (pos) {
  this.raise(pos != null ? pos : this.start, "Unexpected token");
};

},{"./state":13,"./tokentype":17,"./whitespace":19}],13:[function(_dereq_,module,exports){
"use strict";

exports.Parser = Parser;
exports.__esModule = true;

var _identifier = _dereq_("./identifier");

var reservedWords = _identifier.reservedWords;
var keywords = _identifier.keywords;

var tt = _dereq_("./tokentype").types;

var lineBreak = _dereq_("./whitespace").lineBreak;

function Parser(options, input, startPos) {
  this.options = options;
  this.sourceFile = this.options.sourceFile || null;
  this.isKeyword = keywords[this.options.ecmaVersion >= 6 ? 6 : 5];
  this.isReservedWord = reservedWords[this.options.ecmaVersion];
  this.input = input;

  // Load plugins
  this.loadPlugins(this.options.plugins);

  // Set up token state

  // The current position of the tokenizer in the input.
  if (startPos) {
    this.pos = startPos;
    this.lineStart = Math.max(0, this.input.lastIndexOf("\n", startPos));
    this.curLine = this.input.slice(0, this.lineStart).split(lineBreak).length;
  } else {
    this.pos = this.lineStart = 0;
    this.curLine = 1;
  }

  // Properties of the current token:
  // Its type
  this.type = tt.eof;
  // For tokens that include more information than their type, the value
  this.value = null;
  // Its start and end offset
  this.start = this.end = this.pos;
  // And, if locations are used, the {line, column} object
  // corresponding to those offsets
  this.startLoc = this.endLoc = null;

  // Position information for the previous token
  this.lastTokEndLoc = this.lastTokStartLoc = null;
  this.lastTokStart = this.lastTokEnd = this.pos;

  // The context stack is used to superficially track syntactic
  // context to predict whether a regular expression is allowed in a
  // given position.
  this.context = this.initialContext();
  this.exprAllowed = true;

  // Figure out if it's a module code.
  this.strict = this.inModule = this.options.sourceType === "module";

  // Used to signify the start of a potential arrow function
  this.potentialArrowAt = -1;

  // Flags to track whether we are in a function, a generator.
  this.inFunction = this.inGenerator = false;
  // Labels in scope.
  this.labels = [];

  // If enabled, skip leading hashbang line.
  if (this.pos === 0 && this.options.allowHashBang && this.input.slice(0, 2) === "#!") this.skipLineComment(2);
}

Parser.prototype.extend = function (name, f) {
  this[name] = f(this[name]);
};

// Registered plugins

var plugins = {};

exports.plugins = plugins;
Parser.prototype.loadPlugins = function (plugins) {
  for (var _name in plugins) {
    var plugin = exports.plugins[_name];
    if (!plugin) throw new Error("Plugin '" + _name + "' not found");
    plugin(this, plugins[_name]);
  }
};

},{"./identifier":7,"./tokentype":17,"./whitespace":19}],14:[function(_dereq_,module,exports){
"use strict";

var tt = _dereq_("./tokentype").types;

var Parser = _dereq_("./state").Parser;

var lineBreak = _dereq_("./whitespace").lineBreak;

var pp = Parser.prototype;

// ### Statement parsing

// Parse a program. Initializes the parser, reads any number of
// statements, and wraps them in a Program node.  Optionally takes a
// `program` argument.  If present, the statements will be appended
// to its body instead of creating a new node.

pp.parseTopLevel = function (node) {
  var first = true;
  if (!node.body) node.body = [];
  while (this.type !== tt.eof) {
    var stmt = this.parseStatement(true, true);
    node.body.push(stmt);
    if (first && this.isUseStrict(stmt)) this.setStrict(true);
    first = false;
  }
  this.next();
  if (this.options.ecmaVersion >= 6) {
    node.sourceType = this.options.sourceType;
  }
  return this.finishNode(node, "Program");
};

var loopLabel = { kind: "loop" },
    switchLabel = { kind: "switch" };

// Parse a single statement.
//
// If expecting a statement and finding a slash operator, parse a
// regular expression literal. This is to handle cases like
// `if (foo) /blah/.exec(foo)`, where looking at the previous token
// does not help.

pp.parseStatement = function (declaration, topLevel) {
  var starttype = this.type,
      node = this.startNode();

  // Most types of statements are recognized by the keyword they
  // start with. Many are trivial to parse, some require a bit of
  // complexity.

  switch (starttype) {
    case tt._break:case tt._continue:
      return this.parseBreakContinueStatement(node, starttype.keyword);
    case tt._debugger:
      return this.parseDebuggerStatement(node);
    case tt._do:
      return this.parseDoStatement(node);
    case tt._for:
      return this.parseForStatement(node);
    case tt._function:
      if (!declaration && this.options.ecmaVersion >= 6) this.unexpected();
      return this.parseFunctionStatement(node);
    case tt._class:
      if (!declaration) this.unexpected();
      return this.parseClass(node, true);
    case tt._if:
      return this.parseIfStatement(node);
    case tt._return:
      return this.parseReturnStatement(node);
    case tt._switch:
      return this.parseSwitchStatement(node);
    case tt._throw:
      return this.parseThrowStatement(node);
    case tt._try:
      return this.parseTryStatement(node);
    case tt._let:case tt._const:
      if (!declaration) this.unexpected(); // NOTE: falls through to _var
    case tt._var:
      return this.parseVarStatement(node, starttype);
    case tt._while:
      return this.parseWhileStatement(node);
    case tt._with:
      return this.parseWithStatement(node);
    case tt.braceL:
      return this.parseBlock();
    case tt.semi:
      return this.parseEmptyStatement(node);
    case tt._export:
    case tt._import:
      if (!this.options.allowImportExportEverywhere) {
        if (!topLevel) this.raise(this.start, "'import' and 'export' may only appear at the top level");
        if (!this.inModule) this.raise(this.start, "'import' and 'export' may appear only with 'sourceType: module'");
      }
      return starttype === tt._import ? this.parseImport(node) : this.parseExport(node);

    // If the statement does not start with a statement keyword or a
    // brace, it's an ExpressionStatement or LabeledStatement. We
    // simply start parsing an expression, and afterwards, if the
    // next token is a colon and the expression was a simple
    // Identifier node, we switch to interpreting it as a label.
    default:
      var maybeName = this.value,
          expr = this.parseExpression();
      if (starttype === tt.name && expr.type === "Identifier" && this.eat(tt.colon)) return this.parseLabeledStatement(node, maybeName, expr);else return this.parseExpressionStatement(node, expr);
  }
};

pp.parseBreakContinueStatement = function (node, keyword) {
  var isBreak = keyword == "break";
  this.next();
  if (this.eat(tt.semi) || this.insertSemicolon()) node.label = null;else if (this.type !== tt.name) this.unexpected();else {
    node.label = this.parseIdent();
    this.semicolon();
  }

  // Verify that there is an actual destination to break or
  // continue to.
  for (var i = 0; i < this.labels.length; ++i) {
    var lab = this.labels[i];
    if (node.label == null || lab.name === node.label.name) {
      if (lab.kind != null && (isBreak || lab.kind === "loop")) break;
      if (node.label && isBreak) break;
    }
  }
  if (i === this.labels.length) this.raise(node.start, "Unsyntactic " + keyword);
  return this.finishNode(node, isBreak ? "BreakStatement" : "ContinueStatement");
};

pp.parseDebuggerStatement = function (node) {
  this.next();
  this.semicolon();
  return this.finishNode(node, "DebuggerStatement");
};

pp.parseDoStatement = function (node) {
  this.next();
  this.labels.push(loopLabel);
  node.body = this.parseStatement(false);
  this.labels.pop();
  this.expect(tt._while);
  node.test = this.parseParenExpression();
  if (this.options.ecmaVersion >= 6) this.eat(tt.semi);else this.semicolon();
  return this.finishNode(node, "DoWhileStatement");
};

// Disambiguating between a `for` and a `for`/`in` or `for`/`of`
// loop is non-trivial. Basically, we have to parse the init `var`
// statement or expression, disallowing the `in` operator (see
// the second parameter to `parseExpression`), and then check
// whether the next token is `in` or `of`. When there is no init
// part (semicolon immediately after the opening parenthesis), it
// is a regular `for` loop.

pp.parseForStatement = function (node) {
  this.next();
  this.labels.push(loopLabel);
  this.expect(tt.parenL);
  if (this.type === tt.semi) return this.parseFor(node, null);
  if (this.type === tt._var || this.type === tt._let || this.type === tt._const) {
    var _init = this.startNode(),
        varKind = this.type;
    this.next();
    this.parseVar(_init, true, varKind);
    this.finishNode(_init, "VariableDeclaration");
    if ((this.type === tt._in || this.options.ecmaVersion >= 6 && this.isContextual("of")) && _init.declarations.length === 1 && !(varKind !== tt._var && _init.declarations[0].init)) return this.parseForIn(node, _init);
    return this.parseFor(node, _init);
  }
  var refShorthandDefaultPos = { start: 0 };
  var init = this.parseExpression(true, refShorthandDefaultPos);
  if (this.type === tt._in || this.options.ecmaVersion >= 6 && this.isContextual("of")) {
    this.toAssignable(init);
    this.checkLVal(init);
    return this.parseForIn(node, init);
  } else if (refShorthandDefaultPos.start) {
    this.unexpected(refShorthandDefaultPos.start);
  }
  return this.parseFor(node, init);
};

pp.parseFunctionStatement = function (node) {
  this.next();
  return this.parseFunction(node, true);
};

pp.parseIfStatement = function (node) {
  this.next();
  node.test = this.parseParenExpression();
  node.consequent = this.parseStatement(false);
  node.alternate = this.eat(tt._else) ? this.parseStatement(false) : null;
  return this.finishNode(node, "IfStatement");
};

pp.parseReturnStatement = function (node) {
  if (!this.inFunction && !this.options.allowReturnOutsideFunction) this.raise(this.start, "'return' outside of function");
  this.next();

  // In `return` (and `break`/`continue`), the keywords with
  // optional arguments, we eagerly look for a semicolon or the
  // possibility to insert one.

  if (this.eat(tt.semi) || this.insertSemicolon()) node.argument = null;else {
    node.argument = this.parseExpression();this.semicolon();
  }
  return this.finishNode(node, "ReturnStatement");
};

pp.parseSwitchStatement = function (node) {
  this.next();
  node.discriminant = this.parseParenExpression();
  node.cases = [];
  this.expect(tt.braceL);
  this.labels.push(switchLabel);

  // Statements under must be grouped (by label) in SwitchCase
  // nodes. `cur` is used to keep the node that we are currently
  // adding statements to.

  for (var cur, sawDefault; this.type != tt.braceR;) {
    if (this.type === tt._case || this.type === tt._default) {
      var isCase = this.type === tt._case;
      if (cur) this.finishNode(cur, "SwitchCase");
      node.cases.push(cur = this.startNode());
      cur.consequent = [];
      this.next();
      if (isCase) {
        cur.test = this.parseExpression();
      } else {
        if (sawDefault) this.raise(this.lastTokStart, "Multiple default clauses");
        sawDefault = true;
        cur.test = null;
      }
      this.expect(tt.colon);
    } else {
      if (!cur) this.unexpected();
      cur.consequent.push(this.parseStatement(true));
    }
  }
  if (cur) this.finishNode(cur, "SwitchCase");
  this.next(); // Closing brace
  this.labels.pop();
  return this.finishNode(node, "SwitchStatement");
};

pp.parseThrowStatement = function (node) {
  this.next();
  if (lineBreak.test(this.input.slice(this.lastTokEnd, this.start))) this.raise(this.lastTokEnd, "Illegal newline after throw");
  node.argument = this.parseExpression();
  this.semicolon();
  return this.finishNode(node, "ThrowStatement");
};

// Reused empty array added for node fields that are always empty.

var empty = [];

pp.parseTryStatement = function (node) {
  this.next();
  node.block = this.parseBlock();
  node.handler = null;
  if (this.type === tt._catch) {
    var clause = this.startNode();
    this.next();
    this.expect(tt.parenL);
    clause.param = this.parseBindingAtom();
    this.checkLVal(clause.param, true);
    this.expect(tt.parenR);
    clause.guard = null;
    clause.body = this.parseBlock();
    node.handler = this.finishNode(clause, "CatchClause");
  }
  node.guardedHandlers = empty;
  node.finalizer = this.eat(tt._finally) ? this.parseBlock() : null;
  if (!node.handler && !node.finalizer) this.raise(node.start, "Missing catch or finally clause");
  return this.finishNode(node, "TryStatement");
};

pp.parseVarStatement = function (node, kind) {
  this.next();
  this.parseVar(node, false, kind);
  this.semicolon();
  return this.finishNode(node, "VariableDeclaration");
};

pp.parseWhileStatement = function (node) {
  this.next();
  node.test = this.parseParenExpression();
  this.labels.push(loopLabel);
  node.body = this.parseStatement(false);
  this.labels.pop();
  return this.finishNode(node, "WhileStatement");
};

pp.parseWithStatement = function (node) {
  if (this.strict) this.raise(this.start, "'with' in strict mode");
  this.next();
  node.object = this.parseParenExpression();
  node.body = this.parseStatement(false);
  return this.finishNode(node, "WithStatement");
};

pp.parseEmptyStatement = function (node) {
  this.next();
  return this.finishNode(node, "EmptyStatement");
};

pp.parseLabeledStatement = function (node, maybeName, expr) {
  for (var i = 0; i < this.labels.length; ++i) {
    if (this.labels[i].name === maybeName) this.raise(expr.start, "Label '" + maybeName + "' is already declared");
  }var kind = this.type.isLoop ? "loop" : this.type === tt._switch ? "switch" : null;
  this.labels.push({ name: maybeName, kind: kind });
  node.body = this.parseStatement(true);
  this.labels.pop();
  node.label = expr;
  return this.finishNode(node, "LabeledStatement");
};

pp.parseExpressionStatement = function (node, expr) {
  node.expression = expr;
  this.semicolon();
  return this.finishNode(node, "ExpressionStatement");
};

// Parse a semicolon-enclosed block of statements, handling `"use
// strict"` declarations when `allowStrict` is true (used for
// function bodies).

pp.parseBlock = function (allowStrict) {
  var node = this.startNode(),
      first = true,
      oldStrict = undefined;
  node.body = [];
  this.expect(tt.braceL);
  while (!this.eat(tt.braceR)) {
    var stmt = this.parseStatement(true);
    node.body.push(stmt);
    if (first && allowStrict && this.isUseStrict(stmt)) {
      oldStrict = this.strict;
      this.setStrict(this.strict = true);
    }
    first = false;
  }
  if (oldStrict === false) this.setStrict(false);
  return this.finishNode(node, "BlockStatement");
};

// Parse a regular `for` loop. The disambiguation code in
// `parseStatement` will already have parsed the init statement or
// expression.

pp.parseFor = function (node, init) {
  node.init = init;
  this.expect(tt.semi);
  node.test = this.type === tt.semi ? null : this.parseExpression();
  this.expect(tt.semi);
  node.update = this.type === tt.parenR ? null : this.parseExpression();
  this.expect(tt.parenR);
  node.body = this.parseStatement(false);
  this.labels.pop();
  return this.finishNode(node, "ForStatement");
};

// Parse a `for`/`in` and `for`/`of` loop, which are almost
// same from parser's perspective.

pp.parseForIn = function (node, init) {
  var type = this.type === tt._in ? "ForInStatement" : "ForOfStatement";
  this.next();
  node.left = init;
  node.right = this.parseExpression();
  this.expect(tt.parenR);
  node.body = this.parseStatement(false);
  this.labels.pop();
  return this.finishNode(node, type);
};

// Parse a list of variable declarations.

pp.parseVar = function (node, isFor, kind) {
  node.declarations = [];
  node.kind = kind.keyword;
  for (;;) {
    var decl = this.startNode();
    this.parseVarId(decl);
    if (this.eat(tt.eq)) {
      decl.init = this.parseMaybeAssign(isFor);
    } else if (kind === tt._const && !(this.type === tt._in || this.options.ecmaVersion >= 6 && this.isContextual("of"))) {
      this.unexpected();
    } else if (decl.id.type != "Identifier" && !(isFor && (this.type === tt._in || this.isContextual("of")))) {
      this.raise(this.lastTokEnd, "Complex binding patterns require an initialization value");
    } else {
      decl.init = null;
    }
    node.declarations.push(this.finishNode(decl, "VariableDeclarator"));
    if (!this.eat(tt.comma)) break;
  }
  return node;
};

pp.parseVarId = function (decl) {
  decl.id = this.parseBindingAtom();
  this.checkLVal(decl.id, true);
};

// Parse a function declaration or literal (depending on the
// `isStatement` parameter).

pp.parseFunction = function (node, isStatement, allowExpressionBody) {
  this.initFunction(node);
  if (this.options.ecmaVersion >= 6) node.generator = this.eat(tt.star);
  if (isStatement || this.type === tt.name) node.id = this.parseIdent();
  this.parseFunctionParams(node);
  this.parseFunctionBody(node, allowExpressionBody);
  return this.finishNode(node, isStatement ? "FunctionDeclaration" : "FunctionExpression");
};

pp.parseFunctionParams = function (node) {
  this.expect(tt.parenL);
  node.params = this.parseBindingList(tt.parenR, false, false);
};

// Parse a class declaration or literal (depending on the
// `isStatement` parameter).

pp.parseClass = function (node, isStatement) {
  this.next();
  this.parseClassId(node, isStatement);
  this.parseClassSuper(node);
  var classBody = this.startNode();
  var hadConstructor = false;
  classBody.body = [];
  this.expect(tt.braceL);
  while (!this.eat(tt.braceR)) {
    if (this.eat(tt.semi)) continue;
    var method = this.startNode();
    var isGenerator = this.eat(tt.star);
    var isMaybeStatic = this.type === tt.name && this.value === "static";
    this.parsePropertyName(method);
    method["static"] = isMaybeStatic && this.type !== tt.parenL;
    if (method["static"]) {
      if (isGenerator) this.unexpected();
      isGenerator = this.eat(tt.star);
      this.parsePropertyName(method);
    }
    method.kind = "method";
    if (!method.computed) {
      var key = method.key;

      var isGetSet = false;
      if (!isGenerator && key.type === "Identifier" && this.type !== tt.parenL && (key.name === "get" || key.name === "set")) {
        isGetSet = true;
        method.kind = key.name;
        key = this.parsePropertyName(method);
      }
      if (!method["static"] && (key.type === "Identifier" && key.name === "constructor" || key.type === "Literal" && key.value === "constructor")) {
        if (hadConstructor) this.raise(key.start, "Duplicate constructor in the same class");
        if (isGetSet) this.raise(key.start, "Constructor can't have get/set modifier");
        if (isGenerator) this.raise(key.start, "Constructor can't be a generator");
        method.kind = "constructor";
        hadConstructor = true;
      }
    }
    this.parseClassMethod(classBody, method, isGenerator);
  }
  node.body = this.finishNode(classBody, "ClassBody");
  return this.finishNode(node, isStatement ? "ClassDeclaration" : "ClassExpression");
};

pp.parseClassMethod = function (classBody, method, isGenerator) {
  method.value = this.parseMethod(isGenerator);
  classBody.body.push(this.finishNode(method, "MethodDefinition"));
};

pp.parseClassId = function (node, isStatement) {
  node.id = this.type === tt.name ? this.parseIdent() : isStatement ? this.unexpected() : null;
};

pp.parseClassSuper = function (node) {
  node.superClass = this.eat(tt._extends) ? this.parseExprSubscripts() : null;
};

// Parses module export declaration.

pp.parseExport = function (node) {
  this.next();
  // export * from '...'
  if (this.eat(tt.star)) {
    this.expectContextual("from");
    node.source = this.type === tt.string ? this.parseExprAtom() : this.unexpected();
    this.semicolon();
    return this.finishNode(node, "ExportAllDeclaration");
  }
  if (this.eat(tt._default)) {
    // export default ...
    var expr = this.parseMaybeAssign();
    var needsSemi = true;
    if (expr.type == "FunctionExpression" || expr.type == "ClassExpression") {
      needsSemi = false;
      if (expr.id) {
        expr.type = expr.type == "FunctionExpression" ? "FunctionDeclaration" : "ClassDeclaration";
      }
    }
    node.declaration = expr;
    if (needsSemi) this.semicolon();
    return this.finishNode(node, "ExportDefaultDeclaration");
  }
  // export var|const|let|function|class ...
  if (this.shouldParseExportStatement()) {
    node.declaration = this.parseStatement(true);
    node.specifiers = [];
    node.source = null;
  } else {
    // export { x, y as z } [from '...']
    node.declaration = null;
    node.specifiers = this.parseExportSpecifiers();
    if (this.eatContextual("from")) {
      node.source = this.type === tt.string ? this.parseExprAtom() : this.unexpected();
    } else {
      node.source = null;
    }
    this.semicolon();
  }
  return this.finishNode(node, "ExportNamedDeclaration");
};

pp.shouldParseExportStatement = function () {
  return this.type.keyword;
};

// Parses a comma-separated list of module exports.

pp.parseExportSpecifiers = function () {
  var nodes = [],
      first = true;
  // export { x, y as z } [from '...']
  this.expect(tt.braceL);
  while (!this.eat(tt.braceR)) {
    if (!first) {
      this.expect(tt.comma);
      if (this.afterTrailingComma(tt.braceR)) break;
    } else first = false;

    var node = this.startNode();
    node.local = this.parseIdent(this.type === tt._default);
    node.exported = this.eatContextual("as") ? this.parseIdent(true) : node.local;
    nodes.push(this.finishNode(node, "ExportSpecifier"));
  }
  return nodes;
};

// Parses import declaration.

pp.parseImport = function (node) {
  this.next();
  // import '...'
  if (this.type === tt.string) {
    node.specifiers = empty;
    node.source = this.parseExprAtom();
    node.kind = "";
  } else {
    node.specifiers = this.parseImportSpecifiers();
    this.expectContextual("from");
    node.source = this.type === tt.string ? this.parseExprAtom() : this.unexpected();
  }
  this.semicolon();
  return this.finishNode(node, "ImportDeclaration");
};

// Parses a comma-separated list of module imports.

pp.parseImportSpecifiers = function () {
  var nodes = [],
      first = true;
  if (this.type === tt.name) {
    // import defaultObj, { x, y as z } from '...'
    var node = this.startNode();
    node.local = this.parseIdent();
    this.checkLVal(node.local, true);
    nodes.push(this.finishNode(node, "ImportDefaultSpecifier"));
    if (!this.eat(tt.comma)) return nodes;
  }
  if (this.type === tt.star) {
    var node = this.startNode();
    this.next();
    this.expectContextual("as");
    node.local = this.parseIdent();
    this.checkLVal(node.local, true);
    nodes.push(this.finishNode(node, "ImportNamespaceSpecifier"));
    return nodes;
  }
  this.expect(tt.braceL);
  while (!this.eat(tt.braceR)) {
    if (!first) {
      this.expect(tt.comma);
      if (this.afterTrailingComma(tt.braceR)) break;
    } else first = false;

    var node = this.startNode();
    node.imported = this.parseIdent(true);
    node.local = this.eatContextual("as") ? this.parseIdent() : node.imported;
    this.checkLVal(node.local, true);
    nodes.push(this.finishNode(node, "ImportSpecifier"));
  }
  return nodes;
};

},{"./state":13,"./tokentype":17,"./whitespace":19}],15:[function(_dereq_,module,exports){
"use strict";

var _classCallCheck = function (instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } };

exports.__esModule = true;
// The algorithm used to determine whether a regexp can appear at a
// given point in the program is loosely based on sweet.js' approach.
// See https://github.com/mozilla/sweet.js/wiki/design

var Parser = _dereq_("./state").Parser;

var tt = _dereq_("./tokentype").types;

var lineBreak = _dereq_("./whitespace").lineBreak;

var TokContext = exports.TokContext = function TokContext(token, isExpr, preserveSpace, override) {
  _classCallCheck(this, TokContext);

  this.token = token;
  this.isExpr = isExpr;
  this.preserveSpace = preserveSpace;
  this.override = override;
};

var types = {
  b_stat: new TokContext("{", false),
  b_expr: new TokContext("{", true),
  b_tmpl: new TokContext("${", true),
  p_stat: new TokContext("(", false),
  p_expr: new TokContext("(", true),
  q_tmpl: new TokContext("`", true, true, function (p) {
    return p.readTmplToken();
  }),
  f_expr: new TokContext("function", true)
};

exports.types = types;
var pp = Parser.prototype;

pp.initialContext = function () {
  return [types.b_stat];
};

pp.braceIsBlock = function (prevType) {
  var parent = undefined;
  if (prevType === tt.colon && (parent = this.curContext()).token == "{") return !parent.isExpr;
  if (prevType === tt._return) return lineBreak.test(this.input.slice(this.lastTokEnd, this.start));
  if (prevType === tt._else || prevType === tt.semi || prevType === tt.eof) return true;
  if (prevType == tt.braceL) return this.curContext() === types.b_stat;
  return !this.exprAllowed;
};

pp.updateContext = function (prevType) {
  var update = undefined,
      type = this.type;
  if (type.keyword && prevType == tt.dot) this.exprAllowed = false;else if (update = type.updateContext) update.call(this, prevType);else this.exprAllowed = type.beforeExpr;
};

// Token-specific context update code

tt.parenR.updateContext = tt.braceR.updateContext = function () {
  if (this.context.length == 1) {
    this.exprAllowed = true;
    return;
  }
  var out = this.context.pop();
  if (out === types.b_stat && this.curContext() === types.f_expr) {
    this.context.pop();
    this.exprAllowed = false;
  } else if (out === types.b_tmpl) {
    this.exprAllowed = true;
  } else {
    this.exprAllowed = !out.isExpr;
  }
};

tt.braceL.updateContext = function (prevType) {
  this.context.push(this.braceIsBlock(prevType) ? types.b_stat : types.b_expr);
  this.exprAllowed = true;
};

tt.dollarBraceL.updateContext = function () {
  this.context.push(types.b_tmpl);
  this.exprAllowed = true;
};

tt.parenL.updateContext = function (prevType) {
  var statementParens = prevType === tt._if || prevType === tt._for || prevType === tt._with || prevType === tt._while;
  this.context.push(statementParens ? types.p_stat : types.p_expr);
  this.exprAllowed = true;
};

tt.incDec.updateContext = function () {};

tt._function.updateContext = function () {
  if (this.curContext() !== types.b_stat) this.context.push(types.f_expr);
  this.exprAllowed = false;
};

tt.backQuote.updateContext = function () {
  if (this.curContext() === types.q_tmpl) this.context.pop();else this.context.push(types.q_tmpl);
  this.exprAllowed = false;
};

// tokExprAllowed stays unchanged

},{"./state":13,"./tokentype":17,"./whitespace":19}],16:[function(_dereq_,module,exports){
"use strict";

var _classCallCheck = function (instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } };

exports.__esModule = true;

var _identifier = _dereq_("./identifier");

var isIdentifierStart = _identifier.isIdentifierStart;
var isIdentifierChar = _identifier.isIdentifierChar;

var _tokentype = _dereq_("./tokentype");

var tt = _tokentype.types;
var keywordTypes = _tokentype.keywords;

var Parser = _dereq_("./state").Parser;

var SourceLocation = _dereq_("./location").SourceLocation;

var _whitespace = _dereq_("./whitespace");

var lineBreak = _whitespace.lineBreak;
var lineBreakG = _whitespace.lineBreakG;
var isNewLine = _whitespace.isNewLine;
var nonASCIIwhitespace = _whitespace.nonASCIIwhitespace;

// Object type used to represent tokens. Note that normally, tokens
// simply exist as properties on the parser object. This is only
// used for the onToken callback and the external tokenizer.

var Token = exports.Token = function Token(p) {
  _classCallCheck(this, Token);

  this.type = p.type;
  this.value = p.value;
  this.start = p.start;
  this.end = p.end;
  if (p.options.locations) this.loc = new SourceLocation(p, p.startLoc, p.endLoc);
  if (p.options.ranges) this.range = [p.start, p.end];
};

// ## Tokenizer

var pp = Parser.prototype;

// Are we running under Rhino?
var isRhino = typeof Packages !== "undefined";

// Move to the next token

pp.next = function () {
  if (this.options.onToken) this.options.onToken(new Token(this));

  this.lastTokEnd = this.end;
  this.lastTokStart = this.start;
  this.lastTokEndLoc = this.endLoc;
  this.lastTokStartLoc = this.startLoc;
  this.nextToken();
};

pp.getToken = function () {
  this.next();
  return new Token(this);
};

// If we're in an ES6 environment, make parsers iterable
if (typeof Symbol !== "undefined") pp[Symbol.iterator] = function () {
  var self = this;
  return { next: function next() {
      var token = self.getToken();
      return {
        done: token.type === tt.eof,
        value: token
      };
    } };
};

// Toggle strict mode. Re-reads the next number or string to please
// pedantic tests (`"use strict"; 010;` should fail).

pp.setStrict = function (strict) {
  this.strict = strict;
  if (this.type !== tt.num && this.type !== tt.string) return;
  this.pos = this.start;
  if (this.options.locations) {
    while (this.pos < this.lineStart) {
      this.lineStart = this.input.lastIndexOf("\n", this.lineStart - 2) + 1;
      --this.curLine;
    }
  }
  this.nextToken();
};

pp.curContext = function () {
  return this.context[this.context.length - 1];
};

// Read a single token, updating the parser object's token-related
// properties.

pp.nextToken = function () {
  var curContext = this.curContext();
  if (!curContext || !curContext.preserveSpace) this.skipSpace();

  this.start = this.pos;
  if (this.options.locations) this.startLoc = this.curPosition();
  if (this.pos >= this.input.length) return this.finishToken(tt.eof);

  if (curContext.override) return curContext.override(this);else this.readToken(this.fullCharCodeAtPos());
};

pp.readToken = function (code) {
  // Identifier or keyword. '\uXXXX' sequences are allowed in
  // identifiers, so '\' also dispatches to that.
  if (isIdentifierStart(code, this.options.ecmaVersion >= 6) || code === 92 /* '\' */) return this.readWord();

  return this.getTokenFromCode(code);
};

pp.fullCharCodeAtPos = function () {
  var code = this.input.charCodeAt(this.pos);
  if (code <= 55295 || code >= 57344) return code;
  var next = this.input.charCodeAt(this.pos + 1);
  return (code << 10) + next - 56613888;
};

pp.skipBlockComment = function () {
  var startLoc = this.options.onComment && this.options.locations && this.curPosition();
  var start = this.pos,
      end = this.input.indexOf("*/", this.pos += 2);
  if (end === -1) this.raise(this.pos - 2, "Unterminated comment");
  this.pos = end + 2;
  if (this.options.locations) {
    lineBreakG.lastIndex = start;
    var match = undefined;
    while ((match = lineBreakG.exec(this.input)) && match.index < this.pos) {
      ++this.curLine;
      this.lineStart = match.index + match[0].length;
    }
  }
  if (this.options.onComment) this.options.onComment(true, this.input.slice(start + 2, end), start, this.pos, startLoc, this.options.locations && this.curPosition());
};

pp.skipLineComment = function (startSkip) {
  var start = this.pos;
  var startLoc = this.options.onComment && this.options.locations && this.curPosition();
  var ch = this.input.charCodeAt(this.pos += startSkip);
  while (this.pos < this.input.length && ch !== 10 && ch !== 13 && ch !== 8232 && ch !== 8233) {
    ++this.pos;
    ch = this.input.charCodeAt(this.pos);
  }
  if (this.options.onComment) this.options.onComment(false, this.input.slice(start + startSkip, this.pos), start, this.pos, startLoc, this.options.locations && this.curPosition());
};

// Called at the start of the parse and after every token. Skips
// whitespace and comments, and.

pp.skipSpace = function () {
  while (this.pos < this.input.length) {
    var ch = this.input.charCodeAt(this.pos);
    if (ch === 32) {
      // ' '
      ++this.pos;
    } else if (ch === 13) {
      ++this.pos;
      var next = this.input.charCodeAt(this.pos);
      if (next === 10) {
        ++this.pos;
      }
      if (this.options.locations) {
        ++this.curLine;
        this.lineStart = this.pos;
      }
    } else if (ch === 10 || ch === 8232 || ch === 8233) {
      ++this.pos;
      if (this.options.locations) {
        ++this.curLine;
        this.lineStart = this.pos;
      }
    } else if (ch > 8 && ch < 14) {
      ++this.pos;
    } else if (ch === 47) {
      // '/'
      var next = this.input.charCodeAt(this.pos + 1);
      if (next === 42) {
        // '*'
        this.skipBlockComment();
      } else if (next === 47) {
        // '/'
        this.skipLineComment(2);
      } else break;
    } else if (ch === 160) {
      // '\xa0'
      ++this.pos;
    } else if (ch >= 5760 && nonASCIIwhitespace.test(String.fromCharCode(ch))) {
      ++this.pos;
    } else {
      break;
    }
  }
};

// Called at the end of every token. Sets `end`, `val`, and
// maintains `context` and `exprAllowed`, and skips the space after
// the token, so that the next one's `start` will point at the
// right position.

pp.finishToken = function (type, val) {
  this.end = this.pos;
  if (this.options.locations) this.endLoc = this.curPosition();
  var prevType = this.type;
  this.type = type;
  this.value = val;

  this.updateContext(prevType);
};

// ### Token reading

// This is the function that is called to fetch the next token. It
// is somewhat obscure, because it works in character codes rather
// than characters, and because operator parsing has been inlined
// into it.
//
// All in the name of speed.
//
pp.readToken_dot = function () {
  var next = this.input.charCodeAt(this.pos + 1);
  if (next >= 48 && next <= 57) return this.readNumber(true);
  var next2 = this.input.charCodeAt(this.pos + 2);
  if (this.options.ecmaVersion >= 6 && next === 46 && next2 === 46) {
    // 46 = dot '.'
    this.pos += 3;
    return this.finishToken(tt.ellipsis);
  } else {
    ++this.pos;
    return this.finishToken(tt.dot);
  }
};

pp.readToken_slash = function () {
  // '/'
  var next = this.input.charCodeAt(this.pos + 1);
  if (this.exprAllowed) {
    ++this.pos;return this.readRegexp();
  }
  if (next === 61) return this.finishOp(tt.assign, 2);
  return this.finishOp(tt.slash, 1);
};

pp.readToken_mult_modulo = function (code) {
  // '%*'
  var next = this.input.charCodeAt(this.pos + 1);
  if (next === 61) return this.finishOp(tt.assign, 2);
  return this.finishOp(code === 42 ? tt.star : tt.modulo, 1);
};

pp.readToken_pipe_amp = function (code) {
  // '|&'
  var next = this.input.charCodeAt(this.pos + 1);
  if (next === code) return this.finishOp(code === 124 ? tt.logicalOR : tt.logicalAND, 2);
  if (next === 61) return this.finishOp(tt.assign, 2);
  return this.finishOp(code === 124 ? tt.bitwiseOR : tt.bitwiseAND, 1);
};

pp.readToken_caret = function () {
  // '^'
  var next = this.input.charCodeAt(this.pos + 1);
  if (next === 61) return this.finishOp(tt.assign, 2);
  return this.finishOp(tt.bitwiseXOR, 1);
};

pp.readToken_plus_min = function (code) {
  // '+-'
  var next = this.input.charCodeAt(this.pos + 1);
  if (next === code) {
    if (next == 45 && this.input.charCodeAt(this.pos + 2) == 62 && lineBreak.test(this.input.slice(this.lastTokEnd, this.pos))) {
      // A `-->` line comment
      this.skipLineComment(3);
      this.skipSpace();
      return this.nextToken();
    }
    return this.finishOp(tt.incDec, 2);
  }
  if (next === 61) return this.finishOp(tt.assign, 2);
  return this.finishOp(tt.plusMin, 1);
};

pp.readToken_lt_gt = function (code) {
  // '<>'
  var next = this.input.charCodeAt(this.pos + 1);
  var size = 1;
  if (next === code) {
    size = code === 62 && this.input.charCodeAt(this.pos + 2) === 62 ? 3 : 2;
    if (this.input.charCodeAt(this.pos + size) === 61) return this.finishOp(tt.assign, size + 1);
    return this.finishOp(tt.bitShift, size);
  }
  if (next == 33 && code == 60 && this.input.charCodeAt(this.pos + 2) == 45 && this.input.charCodeAt(this.pos + 3) == 45) {
    if (this.inModule) this.unexpected();
    // `<!--`, an XML-style comment that should be interpreted as a line comment
    this.skipLineComment(4);
    this.skipSpace();
    return this.nextToken();
  }
  if (next === 61) size = this.input.charCodeAt(this.pos + 2) === 61 ? 3 : 2;
  return this.finishOp(tt.relational, size);
};

pp.readToken_eq_excl = function (code) {
  // '=!'
  var next = this.input.charCodeAt(this.pos + 1);
  if (next === 61) return this.finishOp(tt.equality, this.input.charCodeAt(this.pos + 2) === 61 ? 3 : 2);
  if (code === 61 && next === 62 && this.options.ecmaVersion >= 6) {
    // '=>'
    this.pos += 2;
    return this.finishToken(tt.arrow);
  }
  return this.finishOp(code === 61 ? tt.eq : tt.prefix, 1);
};

pp.getTokenFromCode = function (code) {
  switch (code) {
    // The interpretation of a dot depends on whether it is followed
    // by a digit or another two dots.
    case 46:
      // '.'
      return this.readToken_dot();

    // Punctuation tokens.
    case 40:
      ++this.pos;return this.finishToken(tt.parenL);
    case 41:
      ++this.pos;return this.finishToken(tt.parenR);
    case 59:
      ++this.pos;return this.finishToken(tt.semi);
    case 44:
      ++this.pos;return this.finishToken(tt.comma);
    case 91:
      ++this.pos;return this.finishToken(tt.bracketL);
    case 93:
      ++this.pos;return this.finishToken(tt.bracketR);
    case 123:
      ++this.pos;return this.finishToken(tt.braceL);
    case 125:
      ++this.pos;return this.finishToken(tt.braceR);
    case 58:
      ++this.pos;return this.finishToken(tt.colon);
    case 63:
      ++this.pos;return this.finishToken(tt.question);

    case 96:
      // '`'
      if (this.options.ecmaVersion < 6) break;
      ++this.pos;
      return this.finishToken(tt.backQuote);

    case 48:
      // '0'
      var next = this.input.charCodeAt(this.pos + 1);
      if (next === 120 || next === 88) return this.readRadixNumber(16); // '0x', '0X' - hex number
      if (this.options.ecmaVersion >= 6) {
        if (next === 111 || next === 79) return this.readRadixNumber(8); // '0o', '0O' - octal number
        if (next === 98 || next === 66) return this.readRadixNumber(2); // '0b', '0B' - binary number
      }
    // Anything else beginning with a digit is an integer, octal
    // number, or float.
    case 49:case 50:case 51:case 52:case 53:case 54:case 55:case 56:case 57:
      // 1-9
      return this.readNumber(false);

    // Quotes produce strings.
    case 34:case 39:
      // '"', "'"
      return this.readString(code);

    // Operators are parsed inline in tiny state machines. '=' (61) is
    // often referred to. `finishOp` simply skips the amount of
    // characters it is given as second argument, and returns a token
    // of the type given by its first argument.

    case 47:
      // '/'
      return this.readToken_slash();

    case 37:case 42:
      // '%*'
      return this.readToken_mult_modulo(code);

    case 124:case 38:
      // '|&'
      return this.readToken_pipe_amp(code);

    case 94:
      // '^'
      return this.readToken_caret();

    case 43:case 45:
      // '+-'
      return this.readToken_plus_min(code);

    case 60:case 62:
      // '<>'
      return this.readToken_lt_gt(code);

    case 61:case 33:
      // '=!'
      return this.readToken_eq_excl(code);

    case 126:
      // '~'
      return this.finishOp(tt.prefix, 1);
  }

  this.raise(this.pos, "Unexpected character '" + codePointToString(code) + "'");
};

pp.finishOp = function (type, size) {
  var str = this.input.slice(this.pos, this.pos + size);
  this.pos += size;
  return this.finishToken(type, str);
};

var regexpUnicodeSupport = false;
try {
  new RegExp("￿", "u");regexpUnicodeSupport = true;
} catch (e) {}

// Parse a regular expression. Some context-awareness is necessary,
// since a '/' inside a '[]' set does not end the expression.

pp.readRegexp = function () {
  var escaped = undefined,
      inClass = undefined,
      start = this.pos;
  for (;;) {
    if (this.pos >= this.input.length) this.raise(start, "Unterminated regular expression");
    var ch = this.input.charAt(this.pos);
    if (lineBreak.test(ch)) this.raise(start, "Unterminated regular expression");
    if (!escaped) {
      if (ch === "[") inClass = true;else if (ch === "]" && inClass) inClass = false;else if (ch === "/" && !inClass) break;
      escaped = ch === "\\";
    } else escaped = false;
    ++this.pos;
  }
  var content = this.input.slice(start, this.pos);
  ++this.pos;
  // Need to use `readWord1` because '\uXXXX' sequences are allowed
  // here (don't ask).
  var mods = this.readWord1();
  var tmp = content;
  if (mods) {
    var validFlags = /^[gmsiy]*$/;
    if (this.options.ecmaVersion >= 6) validFlags = /^[gmsiyu]*$/;
    if (!validFlags.test(mods)) this.raise(start, "Invalid regular expression flag");
    if (mods.indexOf("u") >= 0 && !regexpUnicodeSupport) {
      // Replace each astral symbol and every Unicode escape sequence that
      // possibly represents an astral symbol or a paired surrogate with a
      // single ASCII symbol to avoid throwing on regular expressions that
      // are only valid in combination with the `/u` flag.
      // Note: replacing with the ASCII symbol `x` might cause false
      // negatives in unlikely scenarios. For example, `[\u{61}-b]` is a
      // perfectly valid pattern that is equivalent to `[a-b]`, but it would
      // be replaced by `[x-b]` which throws an error.
      tmp = tmp.replace(/\\u([a-fA-F0-9]{4})|\\u\{([0-9a-fA-F]+)\}|[\uD800-\uDBFF][\uDC00-\uDFFF]/g, "x");
    }
  }
  // Detect invalid regular expressions.
  var value = null;
  // Rhino's regular expression parser is flaky and throws uncatchable exceptions,
  // so don't do detection if we are running under Rhino
  if (!isRhino) {
    try {
      new RegExp(tmp);
    } catch (e) {
      if (e instanceof SyntaxError) this.raise(start, "Error parsing regular expression: " + e.message);
      this.raise(e);
    }
    // Get a regular expression object for this pattern-flag pair, or `null` in
    // case the current environment doesn't support the flags it uses.
    try {
      value = new RegExp(content, mods);
    } catch (err) {}
  }
  return this.finishToken(tt.regexp, { pattern: content, flags: mods, value: value });
};

// Read an integer in the given radix. Return null if zero digits
// were read, the integer value otherwise. When `len` is given, this
// will return `null` unless the integer has exactly `len` digits.

pp.readInt = function (radix, len) {
  var start = this.pos,
      total = 0;
  for (var i = 0, e = len == null ? Infinity : len; i < e; ++i) {
    var code = this.input.charCodeAt(this.pos),
        val = undefined;
    if (code >= 97) val = code - 97 + 10; // a
    else if (code >= 65) val = code - 65 + 10; // A
    else if (code >= 48 && code <= 57) val = code - 48; // 0-9
    else val = Infinity;
    if (val >= radix) break;
    ++this.pos;
    total = total * radix + val;
  }
  if (this.pos === start || len != null && this.pos - start !== len) return null;

  return total;
};

pp.readRadixNumber = function (radix) {
  this.pos += 2; // 0x
  var val = this.readInt(radix);
  if (val == null) this.raise(this.start + 2, "Expected number in radix " + radix);
  if (isIdentifierStart(this.fullCharCodeAtPos())) this.raise(this.pos, "Identifier directly after number");
  return this.finishToken(tt.num, val);
};

// Read an integer, octal integer, or floating-point number.

pp.readNumber = function (startsWithDot) {
  var start = this.pos,
      isFloat = false,
      octal = this.input.charCodeAt(this.pos) === 48;
  if (!startsWithDot && this.readInt(10) === null) this.raise(start, "Invalid number");
  if (this.input.charCodeAt(this.pos) === 46) {
    ++this.pos;
    this.readInt(10);
    isFloat = true;
  }
  var next = this.input.charCodeAt(this.pos);
  if (next === 69 || next === 101) {
    // 'eE'
    next = this.input.charCodeAt(++this.pos);
    if (next === 43 || next === 45) ++this.pos; // '+-'
    if (this.readInt(10) === null) this.raise(start, "Invalid number");
    isFloat = true;
  }
  if (isIdentifierStart(this.fullCharCodeAtPos())) this.raise(this.pos, "Identifier directly after number");

  var str = this.input.slice(start, this.pos),
      val = undefined;
  if (isFloat) val = parseFloat(str);else if (!octal || str.length === 1) val = parseInt(str, 10);else if (/[89]/.test(str) || this.strict) this.raise(start, "Invalid number");else val = parseInt(str, 8);
  return this.finishToken(tt.num, val);
};

// Read a string value, interpreting backslash-escapes.

pp.readCodePoint = function () {
  var ch = this.input.charCodeAt(this.pos),
      code = undefined;

  if (ch === 123) {
    if (this.options.ecmaVersion < 6) this.unexpected();
    ++this.pos;
    code = this.readHexChar(this.input.indexOf("}", this.pos) - this.pos);
    ++this.pos;
    if (code > 1114111) this.unexpected();
  } else {
    code = this.readHexChar(4);
  }
  return code;
};

function codePointToString(code) {
  // UTF-16 Decoding
  if (code <= 65535) {
    return String.fromCharCode(code);
  }return String.fromCharCode((code - 65536 >> 10) + 55296, (code - 65536 & 1023) + 56320);
}

pp.readString = function (quote) {
  var out = "",
      chunkStart = ++this.pos;
  for (;;) {
    if (this.pos >= this.input.length) this.raise(this.start, "Unterminated string constant");
    var ch = this.input.charCodeAt(this.pos);
    if (ch === quote) break;
    if (ch === 92) {
      // '\'
      out += this.input.slice(chunkStart, this.pos);
      out += this.readEscapedChar();
      chunkStart = this.pos;
    } else {
      if (isNewLine(ch)) this.raise(this.start, "Unterminated string constant");
      ++this.pos;
    }
  }
  out += this.input.slice(chunkStart, this.pos++);
  return this.finishToken(tt.string, out);
};

// Reads template string tokens.

pp.readTmplToken = function () {
  var out = "",
      chunkStart = this.pos;
  for (;;) {
    if (this.pos >= this.input.length) this.raise(this.start, "Unterminated template");
    var ch = this.input.charCodeAt(this.pos);
    if (ch === 96 || ch === 36 && this.input.charCodeAt(this.pos + 1) === 123) {
      // '`', '${'
      if (this.pos === this.start && this.type === tt.template) {
        if (ch === 36) {
          this.pos += 2;
          return this.finishToken(tt.dollarBraceL);
        } else {
          ++this.pos;
          return this.finishToken(tt.backQuote);
        }
      }
      out += this.input.slice(chunkStart, this.pos);
      return this.finishToken(tt.template, out);
    }
    if (ch === 92) {
      // '\'
      out += this.input.slice(chunkStart, this.pos);
      out += this.readEscapedChar();
      chunkStart = this.pos;
    } else if (isNewLine(ch)) {
      out += this.input.slice(chunkStart, this.pos);
      ++this.pos;
      if (ch === 13 && this.input.charCodeAt(this.pos) === 10) {
        ++this.pos;
        out += "\n";
      } else {
        out += String.fromCharCode(ch);
      }
      if (this.options.locations) {
        ++this.curLine;
        this.lineStart = this.pos;
      }
      chunkStart = this.pos;
    } else {
      ++this.pos;
    }
  }
};

// Used to read escaped characters

pp.readEscapedChar = function () {
  var ch = this.input.charCodeAt(++this.pos);
  var octal = /^[0-7]+/.exec(this.input.slice(this.pos, this.pos + 3));
  if (octal) octal = octal[0];
  while (octal && parseInt(octal, 8) > 255) octal = octal.slice(0, -1);
  if (octal === "0") octal = null;
  ++this.pos;
  if (octal) {
    if (this.strict) this.raise(this.pos - 2, "Octal literal in strict mode");
    this.pos += octal.length - 1;
    return String.fromCharCode(parseInt(octal, 8));
  } else {
    switch (ch) {
      case 110:
        return "\n"; // 'n' -> '\n'
      case 114:
        return "\r"; // 'r' -> '\r'
      case 120:
        return String.fromCharCode(this.readHexChar(2)); // 'x'
      case 117:
        return codePointToString(this.readCodePoint()); // 'u'
      case 116:
        return "\t"; // 't' -> '\t'
      case 98:
        return "\b"; // 'b' -> '\b'
      case 118:
        return "\u000b"; // 'v' -> '\u000b'
      case 102:
        return "\f"; // 'f' -> '\f'
      case 48:
        return "\u0000"; // 0 -> '\0'
      case 13:
        if (this.input.charCodeAt(this.pos) === 10) ++this.pos; // '\r\n'
      case 10:
        // ' \n'
        if (this.options.locations) {
          this.lineStart = this.pos;++this.curLine;
        }
        return "";
      default:
        return String.fromCharCode(ch);
    }
  }
};

// Used to read character escape sequences ('\x', '\u', '\U').

pp.readHexChar = function (len) {
  var n = this.readInt(16, len);
  if (n === null) this.raise(this.start, "Bad character escape sequence");
  return n;
};

// Used to signal to callers of `readWord1` whether the word
// contained any escape sequences. This is needed because words with
// escape sequences must not be interpreted as keywords.

var containsEsc;

// Read an identifier, and return it as a string. Sets `containsEsc`
// to whether the word contained a '\u' escape.
//
// Incrementally adds only escaped chars, adding other chunks as-is
// as a micro-optimization.

pp.readWord1 = function () {
  containsEsc = false;
  var word = "",
      first = true,
      chunkStart = this.pos;
  var astral = this.options.ecmaVersion >= 6;
  while (this.pos < this.input.length) {
    var ch = this.fullCharCodeAtPos();
    if (isIdentifierChar(ch, astral)) {
      this.pos += ch <= 65535 ? 1 : 2;
    } else if (ch === 92) {
      // "\"
      containsEsc = true;
      word += this.input.slice(chunkStart, this.pos);
      var escStart = this.pos;
      if (this.input.charCodeAt(++this.pos) != 117) // "u"
        this.raise(this.pos, "Expecting Unicode escape sequence \\uXXXX");
      ++this.pos;
      var esc = this.readCodePoint();
      if (!(first ? isIdentifierStart : isIdentifierChar)(esc, astral)) this.raise(escStart, "Invalid Unicode escape");
      word += codePointToString(esc);
      chunkStart = this.pos;
    } else {
      break;
    }
    first = false;
  }
  return word + this.input.slice(chunkStart, this.pos);
};

// Read an identifier or keyword token. Will check for reserved
// words when necessary.

pp.readWord = function () {
  var word = this.readWord1();
  var type = tt.name;
  if ((this.options.ecmaVersion >= 6 || !containsEsc) && this.isKeyword(word)) type = keywordTypes[word];
  return this.finishToken(type, word);
};

},{"./identifier":7,"./location":8,"./state":13,"./tokentype":17,"./whitespace":19}],17:[function(_dereq_,module,exports){
"use strict";

var _classCallCheck = function (instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } };

exports.__esModule = true;
// ## Token types

// The assignment of fine-grained, information-carrying type objects
// allows the tokenizer to store the information it has about a
// token in a way that is very cheap for the parser to look up.

// All token type variables start with an underscore, to make them
// easy to recognize.

// The `beforeExpr` property is used to disambiguate between regular
// expressions and divisions. It is set on all token types that can
// be followed by an expression (thus, a slash after them would be a
// regular expression).
//
// `isLoop` marks a keyword as starting a loop, which is important
// to know when parsing a label, in order to allow or disallow
// continue jumps to that label.

var TokenType = exports.TokenType = function TokenType(label) {
  var conf = arguments[1] === undefined ? {} : arguments[1];

  _classCallCheck(this, TokenType);

  this.label = label;
  this.keyword = conf.keyword;
  this.beforeExpr = !!conf.beforeExpr;
  this.startsExpr = !!conf.startsExpr;
  this.isLoop = !!conf.isLoop;
  this.isAssign = !!conf.isAssign;
  this.prefix = !!conf.prefix;
  this.postfix = !!conf.postfix;
  this.binop = conf.binop || null;
  this.updateContext = null;
};

function binop(name, prec) {
  return new TokenType(name, { beforeExpr: true, binop: prec });
}
var beforeExpr = { beforeExpr: true },
    startsExpr = { startsExpr: true };

var types = {
  num: new TokenType("num", startsExpr),
  regexp: new TokenType("regexp", startsExpr),
  string: new TokenType("string", startsExpr),
  name: new TokenType("name", startsExpr),
  eof: new TokenType("eof"),

  // Punctuation token types.
  bracketL: new TokenType("[", { beforeExpr: true, startsExpr: true }),
  bracketR: new TokenType("]"),
  braceL: new TokenType("{", { beforeExpr: true, startsExpr: true }),
  braceR: new TokenType("}"),
  parenL: new TokenType("(", { beforeExpr: true, startsExpr: true }),
  parenR: new TokenType(")"),
  comma: new TokenType(",", beforeExpr),
  semi: new TokenType(";", beforeExpr),
  colon: new TokenType(":", beforeExpr),
  dot: new TokenType("."),
  question: new TokenType("?", beforeExpr),
  arrow: new TokenType("=>", beforeExpr),
  template: new TokenType("template"),
  ellipsis: new TokenType("...", beforeExpr),
  backQuote: new TokenType("`", startsExpr),
  dollarBraceL: new TokenType("${", { beforeExpr: true, startsExpr: true }),

  // Operators. These carry several kinds of properties to help the
  // parser use them properly (the presence of these properties is
  // what categorizes them as operators).
  //
  // `binop`, when present, specifies that this operator is a binary
  // operator, and will refer to its precedence.
  //
  // `prefix` and `postfix` mark the operator as a prefix or postfix
  // unary operator.
  //
  // `isAssign` marks all of `=`, `+=`, `-=` etcetera, which act as
  // binary operators with a very low precedence, that should result
  // in AssignmentExpression nodes.

  eq: new TokenType("=", { beforeExpr: true, isAssign: true }),
  assign: new TokenType("_=", { beforeExpr: true, isAssign: true }),
  incDec: new TokenType("++/--", { prefix: true, postfix: true, startsExpr: true }),
  prefix: new TokenType("prefix", { beforeExpr: true, prefix: true, startsExpr: true }),
  logicalOR: binop("||", 1),
  logicalAND: binop("&&", 2),
  bitwiseOR: binop("|", 3),
  bitwiseXOR: binop("^", 4),
  bitwiseAND: binop("&", 5),
  equality: binop("==/!=", 6),
  relational: binop("</>", 7),
  bitShift: binop("<</>>", 8),
  plusMin: new TokenType("+/-", { beforeExpr: true, binop: 9, prefix: true, startsExpr: true }),
  modulo: binop("%", 10),
  star: binop("*", 10),
  slash: binop("/", 10)
};

exports.types = types;
// Map keyword names to token types.

var keywords = {};

exports.keywords = keywords;
// Succinct definitions of keyword token types
function kw(name) {
  var options = arguments[1] === undefined ? {} : arguments[1];

  options.keyword = name;
  keywords[name] = types["_" + name] = new TokenType(name, options);
}

kw("break");
kw("case", beforeExpr);
kw("catch");
kw("continue");
kw("debugger");
kw("default");
kw("do", { isLoop: true });
kw("else", beforeExpr);
kw("finally");
kw("for", { isLoop: true });
kw("function", startsExpr);
kw("if");
kw("return", beforeExpr);
kw("switch");
kw("throw", beforeExpr);
kw("try");
kw("var");
kw("let");
kw("const");
kw("while", { isLoop: true });
kw("with");
kw("new", { beforeExpr: true, startsExpr: true });
kw("this", startsExpr);
kw("super", startsExpr);
kw("class");
kw("extends", beforeExpr);
kw("export");
kw("import");
kw("yield", { beforeExpr: true, startsExpr: true });
kw("null", startsExpr);
kw("true", startsExpr);
kw("false", startsExpr);
kw("in", { beforeExpr: true, binop: 7 });
kw("instanceof", { beforeExpr: true, binop: 7 });
kw("typeof", { beforeExpr: true, prefix: true, startsExpr: true });
kw("void", { beforeExpr: true, prefix: true, startsExpr: true });
kw("delete", { beforeExpr: true, prefix: true, startsExpr: true });

},{}],18:[function(_dereq_,module,exports){
"use strict";

exports.isArray = isArray;

// Checks if an object has a property.

exports.has = has;
exports.__esModule = true;

function isArray(obj) {
  return Object.prototype.toString.call(obj) === "[object Array]";
}

function has(obj, propName) {
  return Object.prototype.hasOwnProperty.call(obj, propName);
}

},{}],19:[function(_dereq_,module,exports){
"use strict";

exports.isNewLine = isNewLine;
exports.__esModule = true;
// Matches a whole line break (where CRLF is considered a single
// line break). Used to count lines.

var lineBreak = /\r\n?|\n|\u2028|\u2029/;
exports.lineBreak = lineBreak;
var lineBreakG = new RegExp(lineBreak.source, "g");

exports.lineBreakG = lineBreakG;

function isNewLine(code) {
  return code === 10 || code === 13 || code === 8232 || code == 8233;
}

var nonASCIIwhitespace = /[\u1680\u180e\u2000-\u200a\u202f\u205f\u3000\ufeff]/;
exports.nonASCIIwhitespace = nonASCIIwhitespace;

},{}]},{},[1])(1)
});
}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{}],33:[function(require,module,exports){
(function (global){
(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}(g.acorn || (g.acorn = {})).walk = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(_dereq_,module,exports){
"use strict";

var _classCallCheck = function (instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } };

// AST walker module for Mozilla Parser API compatible trees

// A simple walk is one where you simply specify callbacks to be
// called on specific nodes. The last two arguments are optional. A
// simple use would be
//
//     walk.simple(myTree, {
//         Expression: function(node) { ... }
//     });
//
// to do something with all expressions. All Parser API node types
// can be used to identify node types, as well as Expression,
// Statement, and ScopeBody, which denote categories of nodes.
//
// The base argument can be used to pass a custom (recursive)
// walker, and state can be used to give this walked an initial
// state.

exports.simple = simple;

// An ancestor walk builds up an array of ancestor nodes (including
// the current node) and passes them to the callback as the state parameter.
exports.ancestor = ancestor;

// A recursive walk is one where your functions override the default
// walkers. They can modify and replace the state parameter that's
// threaded through the walk, and can opt how and whether to walk
// their child nodes (by calling their third argument on these
// nodes).
exports.recursive = recursive;

// Find a node with a given start, end, and type (all are optional,
// null can be used as wildcard). Returns a {node, state} object, or
// undefined when it doesn't find a matching node.
exports.findNodeAt = findNodeAt;

// Find the innermost node of a given type that contains the given
// position. Interface similar to findNodeAt.
exports.findNodeAround = findNodeAround;

// Find the outermost matching node after a given position.
exports.findNodeAfter = findNodeAfter;

// Find the outermost matching node before a given position.
exports.findNodeBefore = findNodeBefore;

// Used to create a custom walker. Will fill in all missing node
// type properties with the defaults.
exports.make = make;
exports.__esModule = true;

function simple(node, visitors, base, state) {
  if (!base) base = exports.base;(function c(node, st, override) {
    var type = override || node.type,
        found = visitors[type];
    base[type](node, st, c);
    if (found) found(node, st);
  })(node, state);
}

function ancestor(node, visitors, base, state) {
  if (!base) base = exports.base;
  if (!state) state = [];(function c(node, st, override) {
    var type = override || node.type,
        found = visitors[type];
    if (node != st[st.length - 1]) {
      st = st.slice();
      st.push(node);
    }
    base[type](node, st, c);
    if (found) found(node, st);
  })(node, state);
}

function recursive(node, state, funcs, base) {
  var visitor = funcs ? exports.make(funcs, base) : base;(function c(node, st, override) {
    visitor[override || node.type](node, st, c);
  })(node, state);
}

function makeTest(test) {
  if (typeof test == "string") {
    return function (type) {
      return type == test;
    };
  } else if (!test) {
    return function () {
      return true;
    };
  } else {
    return test;
  }
}

var Found = function Found(node, state) {
  _classCallCheck(this, Found);

  this.node = node;this.state = state;
};

function findNodeAt(node, start, end, test, base, state) {
  test = makeTest(test);
  if (!base) base = exports.base;
  try {
    ;(function c(node, st, override) {
      var type = override || node.type;
      if ((start == null || node.start <= start) && (end == null || node.end >= end)) base[type](node, st, c);
      if (test(type, node) && (start == null || node.start == start) && (end == null || node.end == end)) throw new Found(node, st);
    })(node, state);
  } catch (e) {
    if (e instanceof Found) {
      return e;
    }throw e;
  }
}

function findNodeAround(node, pos, test, base, state) {
  test = makeTest(test);
  if (!base) base = exports.base;
  try {
    ;(function c(node, st, override) {
      var type = override || node.type;
      if (node.start > pos || node.end < pos) {
        return;
      }base[type](node, st, c);
      if (test(type, node)) throw new Found(node, st);
    })(node, state);
  } catch (e) {
    if (e instanceof Found) {
      return e;
    }throw e;
  }
}

function findNodeAfter(node, pos, test, base, state) {
  test = makeTest(test);
  if (!base) base = exports.base;
  try {
    ;(function c(node, st, override) {
      if (node.end < pos) {
        return;
      }var type = override || node.type;
      if (node.start >= pos && test(type, node)) throw new Found(node, st);
      base[type](node, st, c);
    })(node, state);
  } catch (e) {
    if (e instanceof Found) {
      return e;
    }throw e;
  }
}

function findNodeBefore(node, pos, test, base, state) {
  test = makeTest(test);
  if (!base) base = exports.base;
  var max = undefined;(function c(node, st, override) {
    if (node.start > pos) {
      return;
    }var type = override || node.type;
    if (node.end <= pos && (!max || max.node.end < node.end) && test(type, node)) max = new Found(node, st);
    base[type](node, st, c);
  })(node, state);
  return max;
}

function make(funcs, base) {
  if (!base) base = exports.base;
  var visitor = {};
  for (var type in base) visitor[type] = base[type];
  for (var type in funcs) visitor[type] = funcs[type];
  return visitor;
}

function skipThrough(node, st, c) {
  c(node, st);
}
function ignore(_node, _st, _c) {}

// Node walkers.

var base = {};

exports.base = base;
base.Program = base.BlockStatement = function (node, st, c) {
  for (var i = 0; i < node.body.length; ++i) {
    c(node.body[i], st, "Statement");
  }
};
base.Statement = skipThrough;
base.EmptyStatement = ignore;
base.ExpressionStatement = base.ParenthesizedExpression = function (node, st, c) {
  return c(node.expression, st, "Expression");
};
base.IfStatement = function (node, st, c) {
  c(node.test, st, "Expression");
  c(node.consequent, st, "Statement");
  if (node.alternate) c(node.alternate, st, "Statement");
};
base.LabeledStatement = function (node, st, c) {
  return c(node.body, st, "Statement");
};
base.BreakStatement = base.ContinueStatement = ignore;
base.WithStatement = function (node, st, c) {
  c(node.object, st, "Expression");
  c(node.body, st, "Statement");
};
base.SwitchStatement = function (node, st, c) {
  c(node.discriminant, st, "Expression");
  for (var i = 0; i < node.cases.length; ++i) {
    var cs = node.cases[i];
    if (cs.test) c(cs.test, st, "Expression");
    for (var j = 0; j < cs.consequent.length; ++j) {
      c(cs.consequent[j], st, "Statement");
    }
  }
};
base.ReturnStatement = base.YieldExpression = function (node, st, c) {
  if (node.argument) c(node.argument, st, "Expression");
};
base.ThrowStatement = base.SpreadElement = base.RestElement = function (node, st, c) {
  return c(node.argument, st, "Expression");
};
base.TryStatement = function (node, st, c) {
  c(node.block, st, "Statement");
  if (node.handler) c(node.handler.body, st, "ScopeBody");
  if (node.finalizer) c(node.finalizer, st, "Statement");
};
base.WhileStatement = base.DoWhileStatement = function (node, st, c) {
  c(node.test, st, "Expression");
  c(node.body, st, "Statement");
};
base.ForStatement = function (node, st, c) {
  if (node.init) c(node.init, st, "ForInit");
  if (node.test) c(node.test, st, "Expression");
  if (node.update) c(node.update, st, "Expression");
  c(node.body, st, "Statement");
};
base.ForInStatement = base.ForOfStatement = function (node, st, c) {
  c(node.left, st, "ForInit");
  c(node.right, st, "Expression");
  c(node.body, st, "Statement");
};
base.ForInit = function (node, st, c) {
  if (node.type == "VariableDeclaration") c(node, st);else c(node, st, "Expression");
};
base.DebuggerStatement = ignore;

base.FunctionDeclaration = function (node, st, c) {
  return c(node, st, "Function");
};
base.VariableDeclaration = function (node, st, c) {
  for (var i = 0; i < node.declarations.length; ++i) {
    var decl = node.declarations[i];
    if (decl.init) c(decl.init, st, "Expression");
  }
};

base.Function = function (node, st, c) {
  return c(node.body, st, "ScopeBody");
};
base.ScopeBody = function (node, st, c) {
  return c(node, st, "Statement");
};

base.Expression = skipThrough;
base.ThisExpression = base.Super = base.MetaProperty = ignore;
base.ArrayExpression = base.ArrayPattern = function (node, st, c) {
  for (var i = 0; i < node.elements.length; ++i) {
    var elt = node.elements[i];
    if (elt) c(elt, st, "Expression");
  }
};
base.ObjectExpression = base.ObjectPattern = function (node, st, c) {
  for (var i = 0; i < node.properties.length; ++i) {
    c(node.properties[i], st);
  }
};
base.FunctionExpression = base.ArrowFunctionExpression = base.FunctionDeclaration;
base.SequenceExpression = base.TemplateLiteral = function (node, st, c) {
  for (var i = 0; i < node.expressions.length; ++i) {
    c(node.expressions[i], st, "Expression");
  }
};
base.UnaryExpression = base.UpdateExpression = function (node, st, c) {
  c(node.argument, st, "Expression");
};
base.BinaryExpression = base.AssignmentExpression = base.AssignmentPattern = base.LogicalExpression = function (node, st, c) {
  c(node.left, st, "Expression");
  c(node.right, st, "Expression");
};
base.ConditionalExpression = function (node, st, c) {
  c(node.test, st, "Expression");
  c(node.consequent, st, "Expression");
  c(node.alternate, st, "Expression");
};
base.NewExpression = base.CallExpression = function (node, st, c) {
  c(node.callee, st, "Expression");
  if (node.arguments) for (var i = 0; i < node.arguments.length; ++i) {
    c(node.arguments[i], st, "Expression");
  }
};
base.MemberExpression = function (node, st, c) {
  c(node.object, st, "Expression");
  if (node.computed) c(node.property, st, "Expression");
};
base.ExportNamedDeclaration = base.ExportDefaultDeclaration = function (node, st, c) {
  return c(node.declaration, st);
};
base.ImportDeclaration = function (node, st, c) {
  for (var i = 0; i < node.specifiers.length; i++) {
    c(node.specifiers[i], st);
  }
};
base.ImportSpecifier = base.ImportDefaultSpecifier = base.ImportNamespaceSpecifier = base.Identifier = base.Literal = ignore;

base.TaggedTemplateExpression = function (node, st, c) {
  c(node.tag, st, "Expression");
  c(node.quasi, st);
};
base.ClassDeclaration = base.ClassExpression = function (node, st, c) {
  if (node.superClass) c(node.superClass, st, "Expression");
  for (var i = 0; i < node.body.body.length; i++) {
    c(node.body.body[i], st);
  }
};
base.MethodDefinition = base.Property = function (node, st, c) {
  if (node.computed) c(node.key, st, "Expression");
  c(node.value, st, "Expression");
};
base.ComprehensionExpression = function (node, st, c) {
  for (var i = 0; i < node.blocks.length; i++) {
    c(node.blocks[i].right, st, "Expression");
  }c(node.body, st, "Expression");
};

},{}]},{},[1])(1)
});
}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{}],34:[function(require,module,exports){
/**
 * This file automatically generated from `pre-publish.js`.
 * Do not manually edit.
 */

module.exports = {
  "area": true,
  "base": true,
  "br": true,
  "col": true,
  "embed": true,
  "hr": true,
  "img": true,
  "input": true,
  "keygen": true,
  "link": true,
  "menuitem": true,
  "meta": true,
  "param": true,
  "source": true,
  "track": true,
  "wbr": true
};

},{}],35:[function(require,module,exports){
'use strict';

var detect = require('acorn-globals');
var acorn = require('acorn');
var walk = require('acorn/dist/walk');

// polyfill for https://github.com/marijnh/acorn/pull/231
walk.base.ExportNamedDeclaration = walk.base.ExportDefaultDeclaration = function (node, st, c) {
  return c(node.declaration, st);
};
walk.base.ImportDefaultSpecifier = walk.base.ImportNamespaceSpecifier = function () {};

// hacky fix for https://github.com/marijnh/acorn/issues/227
function reallyParse(source) {
  try {
    return acorn.parse(source, {
      ecmaVersion: 5,
      allowReturnOutsideFunction: true
    });
  } catch (ex) {
    if (ex.name !== 'SyntaxError') {
      throw ex;
    }
    return acorn.parse(source, {
      ecmaVersion: 6,
      allowReturnOutsideFunction: true
    });
  }
}

module.exports = addWith

/**
 * Mimic `with` as far as possible but at compile time
 *
 * @param {String} obj The object part of a with expression
 * @param {String} src The body of the with expression
 * @param {Array.<String>} exclude A list of variable names to explicitly exclude
 */
function addWith(obj, src, exclude) {
  obj = obj + ''
  src = src + ''
  exclude = exclude || []
  exclude = exclude.concat(detect(obj).map(function (global) { return global.name; }))
  var vars = detect(src).map(function (global) { return global.name; })
    .filter(function (v) {
      return exclude.indexOf(v) === -1
    })

  if (vars.length === 0) return src

  var declareLocal = ''
  var local = 'locals_for_with'
  var result = 'result_of_with'
  if (/^[a-zA-Z0-9$_]+$/.test(obj)) {
    local = obj
  } else {
    while (vars.indexOf(local) != -1 || exclude.indexOf(local) != -1) {
      local += '_'
    }
    declareLocal = 'var ' + local + ' = (' + obj + ')'
  }
  while (vars.indexOf(result) != -1 || exclude.indexOf(result) != -1) {
    result += '_'
  }

  var inputVars = vars.map(function (v) {
    return JSON.stringify(v) + ' in ' + local + '?' +
      local + '.' + v + ':' +
      'typeof ' + v + '!=="undefined"?' + v + ':undefined'
  })

  src = '(function (' + vars.join(', ') + ') {' +
    src +
    '}.call(this' + inputVars.map(function (v) { return ',' + v; }).join('') + '))'

  return ';' + declareLocal + ';' + unwrapReturns(src, result) + ';'
}

/**
 * Take a self calling function, and unwrap it such that return inside the function
 * results in return outside the function
 *
 * @param {String} src    Some JavaScript code representing a self-calling function
 * @param {String} result A temporary variable to store the result in
 */
function unwrapReturns(src, result) {
  var originalSource = src
  var hasReturn = false
  var ast = reallyParse(src)
  var ref
  src = src.split('')

  // get a reference to the function that was inserted to add an inner context
  if ((ref = ast.body).length !== 1
   || (ref = ref[0]).type !== 'ExpressionStatement'
   || (ref = ref.expression).type !== 'CallExpression'
   || (ref = ref.callee).type !== 'MemberExpression' || ref.computed !== false || ref.property.name !== 'call'
   || (ref = ref.object).type !== 'FunctionExpression')
    throw new Error('AST does not seem to represent a self-calling function')
  var fn = ref

  walk.recursive(ast, null, {
    Function: function (node, st, c) {
      if (node === fn) {
        c(node.body, st, "ScopeBody");
      }
    },
    ReturnStatement: function (node) {
      hasReturn = true
      replace(node, 'return {value: ' + source(node.argument) + '};');
    }
  });
  function source(node) {
    return src.slice(node.start, node.end).join('')
  }
  function replace(node, str) {
    for (var i = node.start; i < node.end; i++) {
      src[i] = ''
    }
    src[node.start] = str
  }
  if (!hasReturn) return originalSource
  else return 'var ' + result + '=' + src.join('') + ';if (' + result + ') return ' + result + '.value'
}

},{"acorn":37,"acorn-globals":36,"acorn/dist/walk":38}],36:[function(require,module,exports){
arguments[4][31][0].apply(exports,arguments)
},{"acorn":37,"acorn/dist/walk":38,"dup":31}],37:[function(require,module,exports){
arguments[4][32][0].apply(exports,arguments)
},{"dup":32}],38:[function(require,module,exports){
arguments[4][33][0].apply(exports,arguments)
},{"dup":33}]},{},[1])(1)
});