shared.js

'use strict';

/* jshint ignore:start */
var noop        = angular.noop;
var extend      = angular.extend;
var jqLite      = angular.element;
var forEach     = angular.forEach;
var isArray     = angular.isArray;
var isString    = angular.isString;
var isObject    = angular.isObject;
var isUndefined = angular.isUndefined;
var isDefined   = angular.isDefined;
var isFunction  = angular.isFunction;
var isElement   = angular.isElement;

var ELEMENT_NODE = 1;
var COMMENT_NODE = 8;

var NG_ANIMATE_CLASSNAME = 'ng-animate';
var NG_ANIMATE_CHILDREN_DATA = '$$ngAnimateChildren';

var isPromiseLike = function(p) {
  return p && p.then ? true : false;
}

function assertArg(arg, name, reason) {
  if (!arg) {
    throw ngMinErr('areq', "Argument '{0}' is {1}", (name || '?'), (reason || "required"));
  }
  return arg;
}

function mergeClasses(a,b) {
  if (!a && !b) return '';
  if (!a) return b;
  if (!b) return a;
  if (isArray(a)) a = a.join(' ');
  if (isArray(b)) b = b.join(' ');
  return a + ' ' + b;
}

function packageStyles(options) {
  var styles = {};
  if (options && (options.to || options.from)) {
    styles.to = options.to;
    styles.from = options.from;
  }
  return styles;
}

function pendClasses(classes, fix, isPrefix) {
  var className = '';
  classes = isArray(classes)
      ? classes
      : classes && isString(classes) && classes.length
          ? classes.split(/\s+/)
          : [];
  forEach(classes, function(klass, i) {
    if (klass && klass.length > 0) {
      className += (i > 0) ? ' ' : '';
      className += isPrefix ? fix + klass
                            : klass + fix;
    }
  });
  return className;
}

function removeFromArray(arr, val) {
  var index = arr.indexOf(val);
  if (val >= 0) {
    arr.splice(index, 1);
  }
}

function stripCommentsFromElement(element) {
  if (element instanceof jqLite) {
    switch (element.length) {
      case 0:
        return [];
        break;

      case 1:
        // there is no point of stripping anything if the element
        // is the only element within the jqLite wrapper.
        // (it's important that we retain the element instance.)
        if (element[0].nodeType === ELEMENT_NODE) {
          return element;
        }
        break;

      default:
        return jqLite(extractElementNode(element));
        break;
    }
  }

  if (element.nodeType === ELEMENT_NODE) {
    return jqLite(element);
  }
}

function extractElementNode(element) {
  if (!element[0]) return element;
  for (var i = 0; i < element.length; i++) {
    var elm = element[i];
    if (elm.nodeType == ELEMENT_NODE) {
      return elm;
    }
  }
}

function $$addClass($$jqLite, element, className) {
  forEach(element, function(elm) {
    $$jqLite.addClass(elm, className);
  });
}

function $$removeClass($$jqLite, element, className) {
  forEach(element, function(elm) {
    $$jqLite.removeClass(elm, className);
  });
}

function applyAnimationClassesFactory($$jqLite) {
  return function(element, options) {
    if (options.addClass) {
      $$addClass($$jqLite, element, options.addClass);
      options.addClass = null;
    }
    if (options.removeClass) {
      $$removeClass($$jqLite, element, options.removeClass);
      options.removeClass = null;
    }
  }
}

function prepareAnimationOptions(options) {
  options = options || {};
  if (!options.$$prepared) {
    var domOperation = options.domOperation || noop;
    options.domOperation = function() {
      options.$$domOperationFired = true;
      domOperation();
      domOperation = noop;
    };
    options.$$prepared = true;
  }
  return options;
}

function applyAnimationStyles(element, options) {
  applyAnimationFromStyles(element, options);
  applyAnimationToStyles(element, options);
}

function applyAnimationFromStyles(element, options) {
  if (options.from) {
    element.css(options.from);
    options.from = null;
  }
}

function applyAnimationToStyles(element, options) {
  if (options.to) {
    element.css(options.to);
    options.to = null;
  }
}

function mergeAnimationOptions(element, target, newOptions) {
  var toAdd = (target.addClass || '') + ' ' + (newOptions.addClass || '');
  var toRemove = (target.removeClass || '') + ' ' + (newOptions.removeClass || '');
  var classes = resolveElementClasses(element.attr('class'), toAdd, toRemove);
  var targetDomOperation = target.hasDomOpreation ? target.domOperation : null;

  extend(target, newOptions);

  // TODO : proper fix is to maintain all animation callback in array and call at last,but now only leave has the callback so no issue with this.
  if (targetDomOperation) {
    target.hasDomOpreation = true;
    target.domOperation = targetDomOperation;
  }

  if (classes.addClass) {
    target.addClass = classes.addClass;
  } else {
    target.addClass = null;
  }

  if (classes.removeClass) {
    target.removeClass = classes.removeClass;
  } else {
    target.removeClass = null;
  }

  return target;
}

function resolveElementClasses(existing, toAdd, toRemove) {
  var ADD_CLASS = 1;
  var REMOVE_CLASS = -1;

  var flags = {};
  existing = splitClassesToLookup(existing);

  toAdd = splitClassesToLookup(toAdd);
  forEach(toAdd, function(value, key) {
    flags[key] = ADD_CLASS;
  });

  toRemove = splitClassesToLookup(toRemove);
  forEach(toRemove, function(value, key) {
    flags[key] = flags[key] === ADD_CLASS ? null : REMOVE_CLASS;
  });

  var classes = {
    addClass: '',
    removeClass: ''
  };

  forEach(flags, function(val, klass) {
    var prop, allow;
    if (val === ADD_CLASS) {
      prop = 'addClass';
      allow = !existing[klass];
    } else if (val === REMOVE_CLASS) {
      prop = 'removeClass';
      allow = existing[klass];
    }
    if (allow) {
      if (classes[prop].length) {
        classes[prop] += ' ';
      }
      classes[prop] += klass;
    }
  });

  function splitClassesToLookup(classes) {
    if (isString(classes)) {
      classes = classes.split(' ');
    }

    var obj = {};
    forEach(classes, function(klass) {
      // sometimes the split leaves empty string values
      // incase extra spaces were applied to the options
      if (klass.length) {
        obj[klass] = true;
      }
    });
    return obj;
  }

  return classes;
}

function getDomNode(element) {
  return (element instanceof angular.element) ? element[0] : element;
}