flatdoc.js

/*!
 * Flatdoc - (c) 2013, 2014 Rico Sta. Cruz
 * http://ricostacruz.com/flatdoc
 * @license MIT
 */

(function($) {
  var exports = this;

  var marked;

  /**
   * Basic Flatdoc module.
   *
   * The main entry point is `Flatdoc.run()`, which invokes the [Runner].
   *
   *     Flatdoc.run({
   *       fetcher: Flatdoc.github('rstacruz/backbone-patterns');
   *     });
   *
   * These fetcher functions are available:
   *
   *     Flatdoc.github('owner/repo')
   *     Flatdoc.github('owner/repo', 'API.md')
   *     Flatdoc.github('owner/repo', 'API.md', 'branch')
   *     Flatdoc.bitbucket('owner/repo')
   *     Flatdoc.bitbucket('owner/repo', 'API.md')
   *     Flatdoc.bitbucket('owner/repo', 'API.md', 'branch')
   *     Flatdoc.file('http://path/to/url')
   *     Flatdoc.file([ 'http://path/to/url', ... ])
   */

  var Flatdoc = exports.Flatdoc = {};

  /**
   * Creates a runner.
   * See [Flatdoc].
   */

  Flatdoc.run = function(options) {
    $(function() { (new Flatdoc.runner(options)).run(); });
  };

  /**
   * File fetcher function.
   *
   * Fetches a given `url` via AJAX.
   * See [Runner#run()] for a description of fetcher functions.
   */

  Flatdoc.file = function(url) {
    function loadData(locations, response, callback) {
      if (locations.length === 0) callback(null, response);

      else $.get(locations.shift())
        .fail(function(e) {
          callback(e, null);
        })
        .done(function (data) {
          if (response.length > 0) response += '\n\n';
          response += data;
          loadData(locations, response, callback);
        });
    }

    return function(callback) {
      loadData(url instanceof Array ?
        url : [url], '', callback);
    };
  };

  /**
   * Github fetcher.
   * Fetches from repo `repo` (in format 'user/repo').
   *
   * If the parameter `filepath` is supplied, it fetches the contents of that
   * given file in the repo's default branch. To fetch the contents of
   * `filepath` from a different branch, the parameter `ref` should be
   * supplied with the target branch name.
   *
   * See [Runner#run()] for a description of fetcher functions.
   *
   * See: http://developer.github.com/v3/repos/contents/
   */
  Flatdoc.github = function(opts) {
    if (typeof opts === 'string') {
      opts = {
        repo: arguments[0],
        filepath: arguments[1]
      };
    }
    var url;
    if (opts.filepath) {
      url = 'https://api.github.com/repos/'+opts.repo+'/contents/'+opts.filepath;
    } else {
      url = 'https://api.github.com/repos/'+opts.repo+'/readme';
    }
    var data = {};
    if (opts.token) {
      data.access_token = opts.token;
    }
    if (opts.ref) {
      data.ref = opts.ref;
    }
    return function(callback) {
      $.get(url, data)
        .fail(function(e) { callback(e, null); })
        .done(function(data) {
          var markdown = exports.Base64.decode(data.content);
          callback(null, markdown);
        });
    };
  };

  /**
   * Bitbucket fetcher.
   * Fetches from repo `repo` (in format 'user/repo').
   *
   * If the parameter `filepath` is supplied, it fetches the contents of that
   * given file in the repo.
   *
   * See [Runner#run()] for a description of fetcher functions.
   *
   * See: https://confluence.atlassian.com/display/BITBUCKET/src+Resources#srcResources-GETrawcontentofanindividualfile
   * See: http://ben.onfabrik.com/posts/embed-bitbucket-source-code-on-your-website
   * Bitbucket appears to have stricter restrictions on
   * Access-Control-Allow-Origin, and so the method here is a bit
   * more complicated than for Github
   *
   * If you don't pass a branch name, then 'default' for Hg repos is assumed
   * For git, you should pass 'master'. In both cases, you should also be able
   * to pass in a revision number here -- in Mercurial, this also includes
   * things like 'tip' or the repo-local integer revision number
   * Default to Mercurial because Git users historically tend to use GitHub
   */
  Flatdoc.bitbucket = function(opts) {
    if (typeof opts === 'string') {
      opts = {
        repo: arguments[0],
        filepath: arguments[1],
        branch: arguments[2]
      };
    }
    if (!opts.filepath) opts.filepath = 'readme.md';
    if (!opts.branch) opts.branch = 'default';

    var url = 'https://bitbucket.org/api/1.0/repositories/'+opts.repo+'/src/'+opts.branch+'/'+opts.filepath;

   return function(callback) {
     $.ajax({
      url: url,
      dataType: 'jsonp',
      error: function(xhr, status, error) {
        alert(error);
      },
      success: function(response) {
        var markdown = response.data;
        callback(null, markdown);
      }
  });
};
};

  /**
   * Parser module.
   * Parses a given Markdown document and returns a JSON object with data
   * on the Markdown document.
   *
   *     var data = Flatdoc.parser.parse('markdown source here');
   *     console.log(data);
   *
   *     data == {
   *       title: 'My Project',
   *       content: '<p>This project is a...',
   *       menu: {...}
   *     }
   */

  var Parser = Flatdoc.parser = {};

  /**
   * Parses a given Markdown document.
   * See `Parser` for more info.
   */
  Parser.parse = function(source, highlight) {
    marked = exports.marked;

    Parser.setMarkedOptions(highlight);

    var html = $("<div>" + marked(source));
    var h1 = html.find('h1').eq(0);
    var title = h1.text();

    // Mangle content
    Transformer.mangle(html);
    var menu = Transformer.getMenu(html);

    return { title: title, content: html, menu: menu };
  };

  Parser.setMarkedOptions = function(highlight) {
    marked.setOptions({
      highlight: function(code, lang) {
        if (lang) {
          return highlight(code, lang);
        }
        return code;
      }
    });
  };

  /**
   * Transformer module.
   * This takes care of any HTML mangling needed.  The main entry point is
   * `.mangle()` which applies all transformations needed.
   *
   *     var $content = $("<p>Hello there, this is a docu...");
   *     Flatdoc.transformer.mangle($content);
   *
   * If you would like to change any of the transformations, decorate any of
   * the functions in `Flatdoc.transformer`.
   */

  var Transformer = Flatdoc.transformer = {};

  /**
   * Takes a given HTML `$content` and improves the markup of it by executing
   * the transformations.
   *
   * > See: [Transformer](#transformer)
   */
  Transformer.mangle = function($content) {
    this.addIDs($content);
    this.buttonize($content);
    this.smartquotes($content);
  };

  /**
   * Adds IDs to headings.
   */

  Transformer.addIDs = function($content) {
    var slugs = ['', '', ''];
    $content.find('h1, h2, h3').each(function() {
      var $el = $(this);
      var num = parseInt(this.nodeName[1]);
      var text = $el.text();
      var slug = Flatdoc.slugify(text);
      if (num > 1) slug = slugs[num - 2] + '-' + slug;
      slugs.length = num - 1;
      slugs = slugs.concat([slug, slug]);
      $el.attr('id', slug);
    });
  };

  /**
   * Returns menu data for a given HTML.
   *
   *     menu = Flatdoc.transformer.getMenu($content);
   *     menu == {
   *       level: 0,
   *       items: [{
   *         section: "Getting started",
   *         level: 1,
   *         items: [...]}, ...]}
   */

  Transformer.getMenu = function($content) {
    var root = {items: [], id: '', level: 0};
    var cache = [root];

    function mkdir_p(level) {
      cache.length = level + 1;
      var obj = cache[level];
      if (!obj) {
        var parent = (level > 1) ? mkdir_p(level-1) : root;
        obj = { items: [], level: level };
        cache = cache.concat([obj, obj]);
        parent.items.push(obj);
      }
      return obj;
    }

    $content.find('h1, h2, h3').each(function() {
      var $el = $(this);
      var level = +(this.nodeName.substr(1));

      var parent = mkdir_p(level-1);

      var obj = { section: $el.text(), items: [], level: level, id: $el.attr('id') };
      parent.items.push(obj);
      cache[level] = obj;
    });

    return root;
  };

  /**
   * Changes "button >" text to buttons.
   */

  Transformer.buttonize = function($content) {
    $content.find('a').each(function() {
      var $a = $(this);

      var m = $a.text().match(/^(.*) >$/);
      if (m) $a.text(m[1]).addClass('button');
    });
  };

  /**
   * Applies smart quotes to a given element.
   * It leaves `code` and `pre` blocks alone.
   */

  Transformer.smartquotes = function ($content) {
    var nodes = getTextNodesIn($content), len = nodes.length;
    for (var i=0; i<len; i++) {
      var node = nodes[i];
      node.nodeValue = quotify(node.nodeValue);
    }
  };

  /**
   * Syntax highlighters.
   *
   * You may add or change more highlighters via the `Flatdoc.highlighters`
   * object.
   *
   *     Flatdoc.highlighters.js = function(code) {
   *     };
   *
   * Each of these functions
   */

  var Highlighters = Flatdoc.highlighters = {};

  /**
   * JavaScript syntax highlighter.
   *
   * Thanks @visionmedia!
   */

  Highlighters.js = Highlighters.javascript = function(code) {
    return code
      .replace(/</g, '&lt;')
      .replace(/>/g, '&gt;')
      .replace(/("[^\"]*?")/g, '<span class="string">$1</span>')
      .replace(/('[^\']*?')/g, '<span class="string">$1</span>')
      .replace(/\/\/(.*)/gm, '<span class="comment">//$1</span>')
      .replace(/\/\*(.*)\*\//gm, '<span class="comment">/*$1*/</span>')
      .replace(/(\d+\.\d+)/gm, '<span class="number">$1</span>')
      .replace(/(\d+)/gm, '<span class="number">$1</span>')
      .replace(/\bnew *(\w+)/gm, '<span class="keyword">new</span> <span class="init">$1</span>')
      .replace(/\b(function|new|throw|return|var|if|else)\b/gm, '<span class="keyword">$1</span>');
  };

  Highlighters.html = function(code) {
    return code
      .replace(/</g, '&lt;')
      .replace(/>/g, '&gt;')
      .replace(/("[^\"]*?")/g, '<span class="string">$1</span>')
      .replace(/('[^\']*?')/g, '<span class="string">$1</span>')
      .replace(/&lt;!--(.*)--&gt;/g, '<span class="comment">&lt;!--$1--&gt;</span>')
      .replace(/&lt;([^!][^\s&]*)/g, '&lt;<span class="keyword">$1</span>');
  };

  Highlighters.generic = function(code) {
    return code
      .replace(/</g, '&lt;')
      .replace(/>/g, '&gt;')
      .replace(/("[^\"]*?")/g, '<span class="string">$1</span>')
      .replace(/('[^\']*?')/g, '<span class="string">$1</span>')
      .replace(/(\/\/|#)(.*)/gm, '<span class="comment">$1$2</span>')
      .replace(/(\d+\.\d+)/gm, '<span class="number">$1</span>')
      .replace(/(\d+)/gm, '<span class="number">$1</span>');
  };

  /**
   * Menu view. Renders menus
   */

  var MenuView = Flatdoc.menuView = function(menu) {
    var $el = $("<ul>");

    function process(node, $parent) {
      var id = node.id || 'root';

      var $li = $('<li>')
        .attr('id', id + '-item')
        .addClass('level-' + node.level)
        .appendTo($parent);

      if (node.section) {
        var $a = $('<a>')
          .html(node.section)
          .attr('id', id + '-link')
          .attr('href', '#' + node.id)
          .addClass('level-' + node.level)
          .appendTo($li);
      }

      if (node.items.length > 0) {
        var $ul = $('<ul>')
          .addClass('level-' + (node.level+1))
          .attr('id', id + '-list')
          .appendTo($li);

        node.items.forEach(function(item) {
          process(item, $ul);
        });
      }
    }

    process(menu, $el);
    return $el;
  };

  /**
   * A runner module that fetches via a `fetcher` function.
   *
   *     var runner = new Flatdoc.runner({
   *       fetcher: Flatdoc.url('readme.txt')
   *     });
   *     runner.run();
   *
   * The following options are available:
   *
   *  - `fetcher` - a function that takes a callback as an argument and
   *    executes that callback when data is returned.
   *
   * See: [Flatdoc.run()]
   */

  var Runner = Flatdoc.runner = function(options) {
    this.initialize(options);
  };

  Runner.prototype.root    = '[role~="flatdoc"]';
  Runner.prototype.menu    = '[role~="flatdoc-menu"]';
  Runner.prototype.title   = '[role~="flatdoc-title"]';
  Runner.prototype.content = '[role~="flatdoc-content"]';

  Runner.prototype.initialize = function(options) {
    $.extend(this, options);
  };

  /**
   * Syntax highlighting.
   *
   * You may define a custom highlight function such as `highlight` from
   * the highlight.js library.
   *
   *     Flatdoc.run({
   *       highlight: function (code, value) {
   *         return hljs.highlight(lang, code).value;
   *       },
   *       ...
   *     });
   *
   */

  Runner.prototype.highlight = function(code, lang) {
    var fn = Flatdoc.highlighters[lang] || Flatdoc.highlighters.generic;
    return fn(code);
  };

  /**
   * Loads the Markdown document (via the fetcher), parses it, and applies it
   * to the elements.
   */

  Runner.prototype.run = function() {
    var doc = this;
    $(doc.root).trigger('flatdoc:loading');
    doc.fetcher(function(err, markdown) {
      if (err) {
        console.error('[Flatdoc] fetching Markdown data failed.', err);
        return;
      }
      var data = Flatdoc.parser.parse(markdown, doc.highlight);
      doc.applyData(data, doc);
      var id = location.hash.substr(1);
      if (id) {
        var el = document.getElementById(id);
        if (el) el.scrollIntoView(true);
      }
      $(doc.root).trigger('flatdoc:ready');
    });
  };

  /**
   * Applies given doc data `data` to elements in object `elements`.
   */

  Runner.prototype.applyData = function(data) {
    var elements = this;

    elements.el('title').html(data.title);
    elements.el('content').html(data.content.find('>*'));
    elements.el('menu').html(MenuView(data.menu));
  };

  /**
   * Fetches a given element from the DOM.
   *
   * Returns a jQuery object.
   * @api private
   */

  Runner.prototype.el = function(aspect) {
    return $(this[aspect], this.root);
  };

  /*
   * Helpers
   */

  // http://stackoverflow.com/questions/298750/how-do-i-select-text-nodes-with-jquery
  function getTextNodesIn(el) {
    var exclude = 'iframe,pre,code';
    return $(el).find(':not('+exclude+')').andSelf().contents().filter(function() {
      return this.nodeType == 3 && $(this).closest(exclude).length === 0;
    });
  }

  // http://www.leancrew.com/all-this/2010/11/smart-quotes-in-javascript/
  function quotify(a) {
    a = a.replace(/(^|[\-\u2014\s(\["])'/g, "$1\u2018");        // opening singles
    a = a.replace(/'/g, "\u2019");                              // closing singles & apostrophes
    a = a.replace(/(^|[\-\u2014\/\[(\u2018\s])"/g, "$1\u201c"); // opening doubles
    a = a.replace(/"/g, "\u201d");                              // closing doubles
    a = a.replace(/\.\.\./g, "\u2026");                         // ellipses
    a = a.replace(/--/g, "\u2014");                             // em-dashes
    return a;
  }

})(jQuery);

/* jshint ignore:start */

/*!
 * marked - a markdown parser
 * Copyright (c) 2011-2013, Christopher Jeffrey. (MIT Licensed)
 * https://github.com/chjj/marked
 */

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