Revert 274558 "Move some extensions renderer resources to extens..."

trunk/src/extensions/renderer/resources/event.js

Index: trunk/src/extensions/renderer/resources/event.js
===================================================================
--- trunk/src/extensions/renderer/resources/event.js	(revision 274563)
+++ trunk/src/extensions/renderer/resources/event.js	(working copy)
@@ -1,528 +0,0 @@
-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-  var eventNatives = requireNative('event_natives');
-  var handleUncaughtException = require('uncaught_exception_handler').handle;
-  var logging = requireNative('logging');
-  var schemaRegistry = requireNative('schema_registry');
-  var sendRequest = require('sendRequest').sendRequest;
-  var utils = require('utils');
-  var validate = require('schemaUtils').validate;
-  var unloadEvent = require('unload_event');
-
-  // Schemas for the rule-style functions on the events API that
-  // only need to be generated occasionally, so populate them lazily.
-  var ruleFunctionSchemas = {
-    // These values are set lazily:
-    // addRules: {},
-    // getRules: {},
-    // removeRules: {}
-  };
-
-  // This function ensures that |ruleFunctionSchemas| is populated.
-  function ensureRuleSchemasLoaded() {
-    if (ruleFunctionSchemas.addRules)
-      return;
-    var eventsSchema = schemaRegistry.GetSchema("events");
-    var eventType = utils.lookup(eventsSchema.types, 'id', 'events.Event');
-
-    ruleFunctionSchemas.addRules =
-        utils.lookup(eventType.functions, 'name', 'addRules');
-    ruleFunctionSchemas.getRules =
-        utils.lookup(eventType.functions, 'name', 'getRules');
-    ruleFunctionSchemas.removeRules =
-        utils.lookup(eventType.functions, 'name', 'removeRules');
-  }
-
-  // A map of event names to the event object that is registered to that name.
-  var attachedNamedEvents = {};
-
-  // An array of all attached event objects, used for detaching on unload.
-  var allAttachedEvents = [];
-
-  // A map of functions that massage event arguments before they are dispatched.
-  // Key is event name, value is function.
-  var eventArgumentMassagers = {};
-
-  // An attachment strategy for events that aren't attached to the browser.
-  // This applies to events with the "unmanaged" option and events without
-  // names.
-  var NullAttachmentStrategy = function(event) {
-    this.event_ = event;
-  };
-  NullAttachmentStrategy.prototype.onAddedListener =
-      function(listener) {
-  };
-  NullAttachmentStrategy.prototype.onRemovedListener =
-      function(listener) {
-  };
-  NullAttachmentStrategy.prototype.detach = function(manual) {
-  };
-  NullAttachmentStrategy.prototype.getListenersByIDs = function(ids) {
-    // |ids| is for filtered events only.
-    return this.event_.listeners;
-  };
-
-  // Handles adding/removing/dispatching listeners for unfiltered events.
-  var UnfilteredAttachmentStrategy = function(event) {
-    this.event_ = event;
-  };
-
-  UnfilteredAttachmentStrategy.prototype.onAddedListener =
-      function(listener) {
-    // Only attach / detach on the first / last listener removed.
-    if (this.event_.listeners.length == 0)
-      eventNatives.AttachEvent(this.event_.eventName);
-  };
-
-  UnfilteredAttachmentStrategy.prototype.onRemovedListener =
-      function(listener) {
-    if (this.event_.listeners.length == 0)
-      this.detach(true);
-  };
-
-  UnfilteredAttachmentStrategy.prototype.detach = function(manual) {
-    eventNatives.DetachEvent(this.event_.eventName, manual);
-  };
-
-  UnfilteredAttachmentStrategy.prototype.getListenersByIDs = function(ids) {
-    // |ids| is for filtered events only.
-    return this.event_.listeners;
-  };
-
-  var FilteredAttachmentStrategy = function(event) {
-    this.event_ = event;
-    this.listenerMap_ = {};
-  };
-
-  FilteredAttachmentStrategy.idToEventMap = {};
-
-  FilteredAttachmentStrategy.prototype.onAddedListener = function(listener) {
-    var id = eventNatives.AttachFilteredEvent(this.event_.eventName,
-                                              listener.filters || {});
-    if (id == -1)
-      throw new Error("Can't add listener");
-    listener.id = id;
-    this.listenerMap_[id] = listener;
-    FilteredAttachmentStrategy.idToEventMap[id] = this.event_;
-  };
-
-  FilteredAttachmentStrategy.prototype.onRemovedListener = function(listener) {
-    this.detachListener(listener, true);
-  };
-
-  FilteredAttachmentStrategy.prototype.detachListener =
-      function(listener, manual) {
-    if (listener.id == undefined)
-      throw new Error("listener.id undefined - '" + listener + "'");
-    var id = listener.id;
-    delete this.listenerMap_[id];
-    delete FilteredAttachmentStrategy.idToEventMap[id];
-    eventNatives.DetachFilteredEvent(id, manual);
-  };
-
-  FilteredAttachmentStrategy.prototype.detach = function(manual) {
-    for (var i in this.listenerMap_)
-      this.detachListener(this.listenerMap_[i], manual);
-  };
-
-  FilteredAttachmentStrategy.prototype.getListenersByIDs = function(ids) {
-    var result = [];
-    for (var i = 0; i < ids.length; i++)
-      $Array.push(result, this.listenerMap_[ids[i]]);
-    return result;
-  };
-
-  function parseEventOptions(opt_eventOptions) {
-    function merge(dest, src) {
-      for (var k in src) {
-        if (!$Object.hasOwnProperty(dest, k)) {
-          dest[k] = src[k];
-        }
-      }
-    }
-
-    var options = opt_eventOptions || {};
-    merge(options, {
-      // Event supports adding listeners with filters ("filtered events"), for
-      // example as used in the webNavigation API.
-      //
-      // event.addListener(listener, [filter1, filter2]);
-      supportsFilters: false,
-
-      // Events supports vanilla events. Most APIs use these.
-      //
-      // event.addListener(listener);
-      supportsListeners: true,
-
-      // Event supports adding rules ("declarative events") rather than
-      // listeners, for example as used in the declarativeWebRequest API.
-      //
-      // event.addRules([rule1, rule2]);
-      supportsRules: false,
-
-      // Event is unmanaged in that the browser has no knowledge of its
-      // existence; it's never invoked, doesn't keep the renderer alive, and
-      // the bindings system has no knowledge of it.
-      //
-      // Both events created by user code (new chrome.Event()) and messaging
-      // events are unmanaged, though in the latter case the browser *does*
-      // interact indirectly with them via IPCs written by hand.
-      unmanaged: false,
-    });
-    return options;
-  };
-
-  // Event object.  If opt_eventName is provided, this object represents
-  // the unique instance of that named event, and dispatching an event
-  // with that name will route through this object's listeners. Note that
-  // opt_eventName is required for events that support rules.
-  //
-  // Example:
-  //   var Event = require('event_bindings').Event;
-  //   chrome.tabs.onChanged = new Event("tab-changed");
-  //   chrome.tabs.onChanged.addListener(function(data) { alert(data); });
-  //   Event.dispatch("tab-changed", "hi");
-  // will result in an alert dialog that says 'hi'.
-  //
-  // If opt_eventOptions exists, it is a dictionary that contains the boolean
-  // entries "supportsListeners" and "supportsRules".
-  // If opt_webViewInstanceId exists, it is an integer uniquely identifying a
-  // <webview> tag within the embedder. If it does not exist, then this is an
-  // extension event rather than a <webview> event.
-  var EventImpl = function(opt_eventName, opt_argSchemas, opt_eventOptions,
-                           opt_webViewInstanceId) {
-    this.eventName = opt_eventName;
-    this.argSchemas = opt_argSchemas;
-    this.listeners = [];
-    this.eventOptions = parseEventOptions(opt_eventOptions);
-    this.webViewInstanceId = opt_webViewInstanceId || 0;
-
-    if (!this.eventName) {
-      if (this.eventOptions.supportsRules)
-        throw new Error("Events that support rules require an event name.");
-      // Events without names cannot be managed by the browser by definition
-      // (the browser has no way of identifying them).
-      this.eventOptions.unmanaged = true;
-    }
-
-    // Track whether the event has been destroyed to help track down the cause
-    // of http://crbug.com/258526.
-    // This variable will eventually hold the stack trace of the destroy call.
-    // TODO(kalman): Delete this and replace with more sound logic that catches
-    // when events are used without being *attached*.
-    this.destroyed = null;
-
-    if (this.eventOptions.unmanaged)
-      this.attachmentStrategy = new NullAttachmentStrategy(this);
-    else if (this.eventOptions.supportsFilters)
-      this.attachmentStrategy = new FilteredAttachmentStrategy(this);
-    else
-      this.attachmentStrategy = new UnfilteredAttachmentStrategy(this);
-  };
-
-  // callback is a function(args, dispatch). args are the args we receive from
-  // dispatchEvent(), and dispatch is a function(args) that dispatches args to
-  // its listeners.
-  function registerArgumentMassager(name, callback) {
-    if (eventArgumentMassagers[name])
-      throw new Error("Massager already registered for event: " + name);
-    eventArgumentMassagers[name] = callback;
-  }
-
-  // Dispatches a named event with the given argument array. The args array is
-  // the list of arguments that will be sent to the event callback.
-  function dispatchEvent(name, args, filteringInfo) {
-    var listenerIDs = [];
-
-    if (filteringInfo)
-      listenerIDs = eventNatives.MatchAgainstEventFilter(name, filteringInfo);
-
-    var event = attachedNamedEvents[name];
-    if (!event)
-      return;
-
-    var dispatchArgs = function(args) {
-      var result = event.dispatch_(args, listenerIDs);
-      if (result)
-        logging.DCHECK(!result.validationErrors, result.validationErrors);
-      return result;
-    };
-
-    if (eventArgumentMassagers[name])
-      eventArgumentMassagers[name](args, dispatchArgs);
-    else
-      dispatchArgs(args);
-  }
-
-  // Registers a callback to be called when this event is dispatched.
-  EventImpl.prototype.addListener = function(cb, filters) {
-    if (!this.eventOptions.supportsListeners)
-      throw new Error("This event does not support listeners.");
-    if (this.eventOptions.maxListeners &&
-        this.getListenerCount_() >= this.eventOptions.maxListeners) {
-      throw new Error("Too many listeners for " + this.eventName);
-    }
-    if (filters) {
-      if (!this.eventOptions.supportsFilters)
-        throw new Error("This event does not support filters.");
-      if (filters.url && !(filters.url instanceof Array))
-        throw new Error("filters.url should be an array.");
-      if (filters.serviceType &&
-          !(typeof filters.serviceType === 'string')) {
-        throw new Error("filters.serviceType should be a string.")
-      }
-    }
-    var listener = {callback: cb, filters: filters};
-    this.attach_(listener);
-    $Array.push(this.listeners, listener);
-  };
-
-  EventImpl.prototype.attach_ = function(listener) {
-    this.attachmentStrategy.onAddedListener(listener);
-
-    if (this.listeners.length == 0) {
-      allAttachedEvents[allAttachedEvents.length] = this;
-      if (this.eventName) {
-        if (attachedNamedEvents[this.eventName]) {
-          throw new Error("Event '" + this.eventName +
-                          "' is already attached.");
-        }
-        attachedNamedEvents[this.eventName] = this;
-      }
-    }
-  };
-
-  // Unregisters a callback.
-  EventImpl.prototype.removeListener = function(cb) {
-    if (!this.eventOptions.supportsListeners)
-      throw new Error("This event does not support listeners.");
-
-    var idx = this.findListener_(cb);
-    if (idx == -1)
-      return;
-
-    var removedListener = $Array.splice(this.listeners, idx, 1)[0];
-    this.attachmentStrategy.onRemovedListener(removedListener);
-
-    if (this.listeners.length == 0) {
-      var i = $Array.indexOf(allAttachedEvents, this);
-      if (i >= 0)
-        delete allAttachedEvents[i];
-      if (this.eventName) {
-        if (!attachedNamedEvents[this.eventName]) {
-          throw new Error(
-              "Event '" + this.eventName + "' is not attached.");
-        }
-        delete attachedNamedEvents[this.eventName];
-      }
-    }
-  };
-
-  // Test if the given callback is registered for this event.
-  EventImpl.prototype.hasListener = function(cb) {
-    if (!this.eventOptions.supportsListeners)
-      throw new Error("This event does not support listeners.");
-    return this.findListener_(cb) > -1;
-  };
-
-  // Test if any callbacks are registered for this event.
-  EventImpl.prototype.hasListeners = function() {
-    return this.getListenerCount_() > 0;
-  };
-
-  // Returns the number of listeners on this event.
-  EventImpl.prototype.getListenerCount_ = function() {
-    if (!this.eventOptions.supportsListeners)
-      throw new Error("This event does not support listeners.");
-    return this.listeners.length;
-  };
-
-  // Returns the index of the given callback if registered, or -1 if not
-  // found.
-  EventImpl.prototype.findListener_ = function(cb) {
-    for (var i = 0; i < this.listeners.length; i++) {
-      if (this.listeners[i].callback == cb) {
-        return i;
-      }
-    }
-
-    return -1;
-  };
-
-  EventImpl.prototype.dispatch_ = function(args, listenerIDs) {
-    if (this.destroyed) {
-      throw new Error(this.eventName + ' was already destroyed at: ' +
-                      this.destroyed);
-    }
-    if (!this.eventOptions.supportsListeners)
-      throw new Error("This event does not support listeners.");
-
-    if (this.argSchemas && logging.DCHECK_IS_ON()) {
-      try {
-        validate(args, this.argSchemas);
-      } catch (e) {
-        e.message += ' in ' + this.eventName;
-        throw e;
-      }
-    }
-
-    // Make a copy of the listeners in case the listener list is modified
-    // while dispatching the event.
-    var listeners = $Array.slice(
-        this.attachmentStrategy.getListenersByIDs(listenerIDs));
-
-    var results = [];
-    for (var i = 0; i < listeners.length; i++) {
-      try {
-        var result = this.wrapper.dispatchToListener(listeners[i].callback,
-                                                     args);
-        if (result !== undefined)
-          $Array.push(results, result);
-      } catch (e) {
-        handleUncaughtException(
-          'Error in event handler for ' +
-              (this.eventName ? this.eventName : '(unknown)') +
-              ': ' + e.message + '\nStack trace: ' + e.stack,
-          e);
-      }
-    }
-    if (results.length)
-      return {results: results};
-  }
-
-  // Can be overridden to support custom dispatching.
-  EventImpl.prototype.dispatchToListener = function(callback, args) {
-    return $Function.apply(callback, null, args);
-  }
-
-  // Dispatches this event object to all listeners, passing all supplied
-  // arguments to this function each listener.
-  EventImpl.prototype.dispatch = function(varargs) {
-    return this.dispatch_($Array.slice(arguments), undefined);
-  };
-
-  // Detaches this event object from its name.
-  EventImpl.prototype.detach_ = function() {
-    this.attachmentStrategy.detach(false);
-  };
-
-  EventImpl.prototype.destroy_ = function() {
-    this.listeners.length = 0;
-    this.detach_();
-    this.destroyed = new Error().stack;
-  };
-
-  EventImpl.prototype.addRules = function(rules, opt_cb) {
-    if (!this.eventOptions.supportsRules)
-      throw new Error("This event does not support rules.");
-
-    // Takes a list of JSON datatype identifiers and returns a schema fragment
-    // that verifies that a JSON object corresponds to an array of only these
-    // data types.
-    function buildArrayOfChoicesSchema(typesList) {
-      return {
-        'type': 'array',
-        'items': {
-          'choices': typesList.map(function(el) {return {'$ref': el};})
-        }
-      };
-    };
-
-    // Validate conditions and actions against specific schemas of this
-    // event object type.
-    // |rules| is an array of JSON objects that follow the Rule type of the
-    // declarative extension APIs. |conditions| is an array of JSON type
-    // identifiers that are allowed to occur in the conditions attribute of each
-    // rule. Likewise, |actions| is an array of JSON type identifiers that are
-    // allowed to occur in the actions attribute of each rule.
-    function validateRules(rules, conditions, actions) {
-      var conditionsSchema = buildArrayOfChoicesSchema(conditions);
-      var actionsSchema = buildArrayOfChoicesSchema(actions);
-      $Array.forEach(rules, function(rule) {
-        validate([rule.conditions], [conditionsSchema]);
-        validate([rule.actions], [actionsSchema]);
-      });
-    };
-
-    if (!this.eventOptions.conditions || !this.eventOptions.actions) {
-      throw new Error('Event ' + this.eventName + ' misses ' +
-                      'conditions or actions in the API specification.');
-    }
-
-    validateRules(rules,
-                  this.eventOptions.conditions,
-                  this.eventOptions.actions);
-
-    ensureRuleSchemasLoaded();
-    // We remove the first parameter from the validation to give the user more
-    // meaningful error messages.
-    validate([this.webViewInstanceId, rules, opt_cb],
-             $Array.splice(
-                 $Array.slice(ruleFunctionSchemas.addRules.parameters), 1));
-    sendRequest(
-      "events.addRules",
-      [this.eventName, this.webViewInstanceId, rules,  opt_cb],
-      ruleFunctionSchemas.addRules.parameters);
-  }
-
-  EventImpl.prototype.removeRules = function(ruleIdentifiers, opt_cb) {
-    if (!this.eventOptions.supportsRules)
-      throw new Error("This event does not support rules.");
-    ensureRuleSchemasLoaded();
-    // We remove the first parameter from the validation to give the user more
-    // meaningful error messages.
-    validate([this.webViewInstanceId, ruleIdentifiers, opt_cb],
-             $Array.splice(
-                 $Array.slice(ruleFunctionSchemas.removeRules.parameters), 1));
-    sendRequest("events.removeRules",
-                [this.eventName,
-                 this.webViewInstanceId,
-                 ruleIdentifiers,
-                 opt_cb],
-                ruleFunctionSchemas.removeRules.parameters);
-  }
-
-  EventImpl.prototype.getRules = function(ruleIdentifiers, cb) {
-    if (!this.eventOptions.supportsRules)
-      throw new Error("This event does not support rules.");
-    ensureRuleSchemasLoaded();
-    // We remove the first parameter from the validation to give the user more
-    // meaningful error messages.
-    validate([this.webViewInstanceId, ruleIdentifiers, cb],
-             $Array.splice(
-                 $Array.slice(ruleFunctionSchemas.getRules.parameters), 1));
-
-    sendRequest(
-      "events.getRules",
-      [this.eventName, this.webViewInstanceId, ruleIdentifiers, cb],
-      ruleFunctionSchemas.getRules.parameters);
-  }
-
-  unloadEvent.addListener(function() {
-    for (var i = 0; i < allAttachedEvents.length; ++i) {
-      var event = allAttachedEvents[i];
-      if (event)
-        event.detach_();
-    }
-  });
-
-  var Event = utils.expose('Event', EventImpl, { functions: [
-    'addListener',
-    'removeListener',
-    'hasListener',
-    'hasListeners',
-    'dispatchToListener',
-    'dispatch',
-    'addRules',
-    'removeRules',
-    'getRules'
-  ] });
-
-  // NOTE: Event is (lazily) exposed as chrome.Event from dispatcher.cc.
-  exports.Event = Event;
-
-  exports.dispatchEvent = dispatchEvent;
-  exports.parseEventOptions = parseEventOptions;
-  exports.registerArgumentMassager = registerArgumentMassager;