chrome/renderer/resources/extensions/declarative_content_custom_bindings.js

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 // Custom binding for the declarativeContent API.
   6
   7 var binding = require('binding').Binding.create('declarativeContent');
   8
   9 var utils = require('utils');
  10 var validate = require('schemaUtils').validate;
  11 var canonicalizeCompoundSelector =
  12     requireNative('css_natives').CanonicalizeCompoundSelector;
  13 var setIcon = require('setIcon').setIcon;
  14
  15 binding.registerCustomHook( function(api) {
  16   var declarativeContent = api.compiledApi;
  17
  18   // Returns the schema definition of type |typeId| defined in |namespace|.
  19   function getSchema(typeId) {
  20     return utils.lookup(api.schema.types,
  21                         'id',
  22                         'declarativeContent.' + typeId);
  23   }
  24
  25   // Helper function for the constructor of concrete datatypes of the
  26   // declarative content API.
  27   // Makes sure that |this| contains the union of parameters and
  28   // {'instanceType': 'declarativeContent.' + typeId} and validates the
  29   // generated union dictionary against the schema for |typeId|.
  30   function setupInstance(instance, parameters, typeId) {
  31     for (var key in parameters) {
  32       if ($Object.hasOwnProperty(parameters, key)) {
  33         instance[key] = parameters[key];
  34       }
  35     }
  36     instance.instanceType = 'declarativeContent.' + typeId;
  37     var schema = getSchema(typeId);
  38     validate([instance], [schema]);
  39   }
  40
  41   function canonicalizeCssSelectors(selectors) {
  42     for (var i = 0; i < selectors.length; i++) {
  43       var canonicalizedSelector = canonicalizeCompoundSelector(selectors[i]);
  44       if (canonicalizedSelector == '') {
  45         throw new Error(
  46             'Element of \'css\' array must be a ' +
  47             'list of valid compound selectors: ' +
  48             selectors[i]);
  49       }
  50       selectors[i] = canonicalizedSelector;
  51     }
  52   }
  53
  54   // Setup all data types for the declarative content API.
  55   declarativeContent.PageStateMatcher = function(parameters) {
  56     setupInstance(this, parameters, 'PageStateMatcher');
  57     if ($Object.hasOwnProperty(this, 'css')) {
  58       canonicalizeCssSelectors(this.css);
  59     }
  60   };
  61   declarativeContent.ShowPageAction = function(parameters) {
  62     setupInstance(this, parameters, 'ShowPageAction');
  63   };
  64   declarativeContent.RequestContentScript = function(parameters) {
  65     setupInstance(this, parameters, 'RequestContentScript');
  66   };
  67   // TODO(rockot): Do not expose this in M39 stable. Making this restriction
  68   // possible will take some extra work. See http://crbug.com/415315
  69   declarativeContent.SetIcon = function(parameters) {
  70     setIcon(parameters, function (data) {
  71       setupInstance(this, data, 'SetIcon');
  72     }.bind(this));
  73   };
  74 });
  75
  76 exports.binding = binding.generate();