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Code Editor : states.js

(function ($) {

/**
 * The base States namespace.
 *
 * Having the local states variable allows us to use the States namespace
 * without having to always declare "Drupal.states".
 */
var states = Drupal.states = {
  // An array of functions that should be postponed.
  postponed: []
};

/**
 * Attaches the states.
 */
Drupal.behaviors.states = {
  attach: function (context, settings) {
    var $context = $(context);
    for (var selector in settings.states) {
      for (var state in settings.states[selector]) {
        new states.Dependent({
          element: $context.find(selector),
          state: states.State.sanitize(state),
          constraints: settings.states[selector][state]
        });
      }
    }

// Execute all postponed functions now.
    while (states.postponed.length) {
      (states.postponed.shift())();
    }
  }
};

/**
 * Object representing an element that depends on other elements.
 *
 * @param args
 *   Object with the following keys (all of which are required):
 *   - element: A jQuery object of the dependent element
 *   - state: A State object describing the state that is dependent
 *   - constraints: An object with dependency specifications. Lists all elements
 *     that this element depends on. It can be nested and can contain arbitrary
 *     AND and OR clauses.
 */
states.Dependent = function (args) {
  $.extend(this, { values: {}, oldValue: null }, args);

this.dependees = this.getDependees();
  for (var selector in this.dependees) {
    this.initializeDependee(selector, this.dependees[selector]);
  }
};

/**
 * Comparison functions for comparing the value of an element with the
 * specification from the dependency settings. If the object type can't be
 * found in this list, the === operator is used by default.
 */
states.Dependent.comparisons = {
  'RegExp': function (reference, value) {
    return reference.test(value);
  },
  'Function': function (reference, value) {
    // The "reference" variable is a comparison function.
    return reference(value);
  },
  'Number': function (reference, value) {
    // If "reference" is a number and "value" is a string, then cast reference
    // as a string before applying the strict comparison in compare(). Otherwise
    // numeric keys in the form's #states array fail to match string values
    // returned from jQuery's val().
    return (typeof value === 'string') ? compare(reference.toString(), value) : compare(reference, value);
  }
};

states.Dependent.prototype = {
  /**
   * Initializes one of the elements this dependent depends on.
   *
   * @param selector
   *   The CSS selector describing the dependee.
   * @param dependeeStates
   *   The list of states that have to be monitored for tracking the
   *   dependee's compliance status.
   */
  initializeDependee: function (selector, dependeeStates) {
    var state;

// Cache for the states of this dependee.
    this.values[selector] = {};

for (var i in dependeeStates) {
      if (dependeeStates.hasOwnProperty(i)) {
        state = dependeeStates[i];
        // Make sure we're not initializing this selector/state combination twice.
        if ($.inArray(state, dependeeStates) === -1) {
          continue;
        }

state = states.State.sanitize(state);

// Initialize the value of this state.
        this.values[selector][state.name] = null;

// Monitor state changes of the specified state for this dependee.
        $(selector).bind('state:' + state, $.proxy(function (e) {
          this.update(selector, state, e.value);
        }, this));

// Make sure the event we just bound ourselves to is actually fired.
        new states.Trigger({ selector: selector, state: state });
      }
    }
  },

/**
   * Compares a value with a reference value.
   *
   * @param reference
   *   The value used for reference.
   * @param selector
   *   CSS selector describing the dependee.
   * @param state
   *   A State object describing the dependee's updated state.
   *
   * @return
   *   true or false.
   */
  compare: function (reference, selector, state) {
    var value = this.values[selector][state.name];
    if (reference.constructor.name in states.Dependent.comparisons) {
      // Use a custom compare function for certain reference value types.
      return states.Dependent.comparisons[reference.constructor.name](reference, value);
    }
    else {
      // Do a plain comparison otherwise.
      return compare(reference, value);
    }
  },

/**
   * Update the value of a dependee's state.
   *
   * @param selector
   *   CSS selector describing the dependee.
   * @param state
   *   A State object describing the dependee's updated state.
   * @param value
   *   The new value for the dependee's updated state.
   */
  update: function (selector, state, value) {
    // Only act when the 'new' value is actually new.
    if (value !== this.values[selector][state.name]) {
      this.values[selector][state.name] = value;
      this.reevaluate();
    }
  },

/**
   * Triggers change events in case a state changed.
   */
  reevaluate: function () {
    // Check whether any constraint for this dependent state is satisifed.
    var value = this.verifyConstraints(this.constraints);

// Only invoke a state change event when the value actually changed.
    if (value !== this.oldValue) {
      // Store the new value so that we can compare later whether the value
      // actually changed.
      this.oldValue = value;

// Normalize the value to match the normalized state name.
      value = invert(value, this.state.invert);

// By adding "trigger: true", we ensure that state changes don't go into
      // infinite loops.
      this.element.trigger({ type: 'state:' + this.state, value: value, trigger: true });
    }
  },

/**
   * Evaluates child constraints to determine if a constraint is satisfied.
   *
   * @param constraints
   *   A constraint object or an array of constraints.
   * @param selector
   *   The selector for these constraints. If undefined, there isn't yet a
   *   selector that these constraints apply to. In that case, the keys of the
   *   object are interpreted as the selector if encountered.
   *
   * @return
   *   true or false, depending on whether these constraints are satisfied.
   */
  verifyConstraints: function(constraints, selector) {
    var result;
    if ($.isArray(constraints)) {
      // This constraint is an array (OR or XOR).
      var hasXor = $.inArray('xor', constraints) === -1;
      for (var i = 0, len = constraints.length; i < len; i++) {
        if (constraints[i] != 'xor') {
          var constraint = this.checkConstraints(constraints[i], selector, i);
          // Return if this is OR and we have a satisfied constraint or if this
          // is XOR and we have a second satisfied constraint.
          if (constraint && (hasXor || result)) {
            return hasXor;
          }
          result = result || constraint;
        }
      }
    }
    // Make sure we don't try to iterate over things other than objects. This
    // shouldn't normally occur, but in case the condition definition is bogus,
    // we don't want to end up with an infinite loop.
    else if ($.isPlainObject(constraints)) {
      // This constraint is an object (AND).
      for (var n in constraints) {
        if (constraints.hasOwnProperty(n)) {
          result = ternary(result, this.checkConstraints(constraints[n], selector, n));
          // False and anything else will evaluate to false, so return when any
          // false condition is found.
          if (result === false) { return false; }
        }
      }
    }
    return result;
  },

/**
   * Checks whether the value matches the requirements for this constraint.
   *
   * @param value
   *   Either the value of a state or an array/object of constraints. In the
   *   latter case, resolving the constraint continues.
   * @param selector
   *   The selector for this constraint. If undefined, there isn't yet a
   *   selector that this constraint applies to. In that case, the state key is
   *   propagates to a selector and resolving continues.
   * @param state
   *   The state to check for this constraint. If undefined, resolving
   *   continues.
   *   If both selector and state aren't undefined and valid non-numeric
   *   strings, a lookup for the actual value of that selector's state is
   *   performed. This parameter is not a State object but a pristine state
   *   string.
   *
   * @return
   *   true or false, depending on whether this constraint is satisfied.
   */
  checkConstraints: function(value, selector, state) {
    // Normalize the last parameter. If it's non-numeric, we treat it either as
    // a selector (in case there isn't one yet) or as a trigger/state.
    if (typeof state !== 'string' || (/[0-9]/).test(state[0])) {
      state = null;
    }
    else if (typeof selector === 'undefined') {
      // Propagate the state to the selector when there isn't one yet.
      selector = state;
      state = null;
    }

if (state !== null) {
      // constraints is the actual constraints of an element to check for.
      state = states.State.sanitize(state);
      return invert(this.compare(value, selector, state), state.invert);
    }
    else {
      // Resolve this constraint as an AND/OR operator.
      return this.verifyConstraints(value, selector);
    }
  },

/**
   * Gathers information about all required triggers.
   */
  getDependees: function() {
    var cache = {};
    // Swivel the lookup function so that we can record all available selector-
    // state combinations for initialization.
    var _compare = this.compare;
    this.compare = function(reference, selector, state) {
      (cache[selector] || (cache[selector] = [])).push(state.name);
      // Return nothing (=== undefined) so that the constraint loops are not
      // broken.
    };

// This call doesn't actually verify anything but uses the resolving
    // mechanism to go through the constraints array, trying to look up each
    // value. Since we swivelled the compare function, this comparison returns
    // undefined and lookup continues until the very end. Instead of lookup up
    // the value, we record that combination of selector and state so that we
    // can initialize all triggers.
    this.verifyConstraints(this.constraints);
    // Restore the original function.
    this.compare = _compare;

return cache;
  }
};

states.Trigger = function (args) {
  $.extend(this, args);

if (this.state in states.Trigger.states) {
    this.element = $(this.selector);

// Only call the trigger initializer when it wasn't yet attached to this
    // element. Otherwise we'd end up with duplicate events.
    if (!this.element.data('trigger:' + this.state)) {
      this.initialize();
    }
  }
};

states.Trigger.prototype = {
  initialize: function () {
    var trigger = states.Trigger.states[this.state];

if (typeof trigger == 'function') {
      // We have a custom trigger initialization function.
      trigger.call(window, this.element);
    }
    else {
      for (var event in trigger) {
        if (trigger.hasOwnProperty(event)) {
          this.defaultTrigger(event, trigger[event]);
        }
      }
    }

// Mark this trigger as initialized for this element.
    this.element.data('trigger:' + this.state, true);
  },

defaultTrigger: function (event, valueFn) {
    var oldValue = valueFn.call(this.element);

// Attach the event callback.
    this.element.bind(event, $.proxy(function (e) {
      var value = valueFn.call(this.element, e);
      // Only trigger the event if the value has actually changed.
      if (oldValue !== value) {
        this.element.trigger({ type: 'state:' + this.state, value: value, oldValue: oldValue });
        oldValue = value;
      }
    }, this));

states.postponed.push($.proxy(function () {
      // Trigger the event once for initialization purposes.
      this.element.trigger({ type: 'state:' + this.state, value: oldValue, oldValue: null });
    }, this));
  }
};

/**
 * This list of states contains functions that are used to monitor the state
 * of an element. Whenever an element depends on the state of another element,
 * one of these trigger functions is added to the dependee so that the
 * dependent element can be updated.
 */
states.Trigger.states = {
  // 'empty' describes the state to be monitored
  empty: {
    // 'keyup' is the (native DOM) event that we watch for.
    'keyup': function () {
      // The function associated to that trigger returns the new value for the
      // state.
      return this.val() == '';
    }
  },

checked: {
    'change': function () {
      return this.is(':checked');
    }
  },

// For radio buttons, only return the value if the radio button is selected.
  value: {
    'keyup': function () {
      // Radio buttons share the same :input[name="key"] selector.
      if (this.length > 1) {
        // Initial checked value of radios is undefined, so we return false.
        return this.filter(':checked').val() || false;
      }
      return this.val();
    },
    'change': function () {
      // Radio buttons share the same :input[name="key"] selector.
      if (this.length > 1) {
        // Initial checked value of radios is undefined, so we return false.
        return this.filter(':checked').val() || false;
      }
      return this.val();
    }
  },

collapsed: {
    'collapsed': function(e) {
      return (typeof e !== 'undefined' && 'value' in e) ? e.value : this.is('.collapsed');
    }
  }
};

/**
 * A state object is used for describing the state and performing aliasing.
 */
states.State = function(state) {
  // We may need the original unresolved name later.
  this.pristine = this.name = state;

// Normalize the state name.
  while (true) {
    // Iteratively remove exclamation marks and invert the value.
    while (this.name.charAt(0) == '!') {
      this.name = this.name.substring(1);
      this.invert = !this.invert;
    }

// Replace the state with its normalized name.
    if (this.name in states.State.aliases) {
      this.name = states.State.aliases[this.name];
    }
    else {
      break;
    }
  }
};

/**
 * Creates a new State object by sanitizing the passed value.
 */
states.State.sanitize = function (state) {
  if (state instanceof states.State) {
    return state;
  }
  else {
    return new states.State(state);
  }
};

/**
 * This list of aliases is used to normalize states and associates negated names
 * with their respective inverse state.
 */
states.State.aliases = {
  'enabled': '!disabled',
  'invisible': '!visible',
  'invalid': '!valid',
  'untouched': '!touched',
  'optional': '!required',
  'filled': '!empty',
  'unchecked': '!checked',
  'irrelevant': '!relevant',
  'expanded': '!collapsed',
  'readwrite': '!readonly'
};

states.State.prototype = {
  invert: false,

/**
   * Ensures that just using the state object returns the name.
   */
  toString: function() {
    return this.name;
  }
};

/**
 * Global state change handlers. These are bound to "document" to cover all
 * elements whose state changes. Events sent to elements within the page
 * bubble up to these handlers. We use this system so that themes and modules
 * can override these state change handlers for particular parts of a page.
 */
$(document).bind('state:disabled', function(e) {
  // Only act when this change was triggered by a dependency and not by the
  // element monitoring itself.
  if (e.trigger) {
    $(e.target)
      .attr('disabled', e.value)
        .closest('.form-item, .form-submit, .form-wrapper').toggleClass('form-disabled', e.value)
        .find('select, input, textarea').attr('disabled', e.value);

// Note: WebKit nightlies don't reflect that change correctly.
    // See https://bugs.webkit.org/show_bug.cgi?id=23789
  }
});

$(document).bind('state:required', function(e) {
  if (e.trigger) {
    if (e.value) {
      $(e.target).closest('.form-item, .form-wrapper').find('label').append('<span class="form-required">*</span>');
    }
    else {
      $(e.target).closest('.form-item, .form-wrapper').find('label .form-required').remove();
    }
  }
});

$(document).bind('state:visible', function(e) {
  if (e.trigger) {
      $(e.target).closest('.form-item, .form-submit, .form-wrapper').toggle(e.value);
  }
});

$(document).bind('state:checked', function(e) {
  if (e.trigger) {
    $(e.target).attr('checked', e.value);
  }
});

$(document).bind('state:collapsed', function(e) {
  if (e.trigger) {
    if ($(e.target).is('.collapsed') !== e.value) {
      $('> legend a', e.target).click();
    }
  }
});

/**
 * These are helper functions implementing addition "operators" and don't
 * implement any logic that is particular to states.
 */

// Bitwise AND with a third undefined state.
function ternary (a, b) {
  return typeof a === 'undefined' ? b : (typeof b === 'undefined' ? a : a && b);
}

// Inverts a (if it's not undefined) when invert is true.
function invert (a, invert) {
  return (invert && typeof a !== 'undefined') ? !a : a;
}

// Compares two values while ignoring undefined values.
function compare (a, b) {
  return (a === b) ? (typeof a === 'undefined' ? a : true) : (typeof a === 'undefined' || typeof b === 'undefined');
}

})(jQuery);

${this.title}

Code Editor : states.js