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 7var binding = require('binding').Binding.create('declarativeContent'); 8 9var utils = require('utils'); 10var validate = require('schemaUtils').validate; 11var canonicalizeCompoundSelector = 12 requireNative('css_natives').CanonicalizeCompoundSelector; 13 14binding.registerCustomHook( function(api) { 15 var declarativeContent = api.compiledApi; 16 17 // Returns the schema definition of type |typeId| defined in |namespace|. 18 function getSchema(typeId) { 19 return utils.lookup(api.schema.types, 20 'id', 21 'declarativeContent.' + typeId); 22 } 23 24 // Helper function for the constructor of concrete datatypes of the 25 // declarative content API. 26 // Makes sure that |this| contains the union of parameters and 27 // {'instanceType': 'declarativeContent.' + typeId} and validates the 28 // generated union dictionary against the schema for |typeId|. 29 function setupInstance(instance, parameters, typeId) { 30 for (var key in parameters) { 31 if ($Object.hasOwnProperty(parameters, key)) { 32 instance[key] = parameters[key]; 33 } 34 } 35 instance.instanceType = 'declarativeContent.' + typeId; 36 var schema = getSchema(typeId); 37 validate([instance], [schema]); 38 } 39 40 function canonicalizeCssSelectors(selectors) { 41 for (var i = 0; i < selectors.length; i++) { 42 var canonicalizedSelector = canonicalizeCompoundSelector(selectors[i]); 43 if (canonicalizedSelector == '') { 44 throw new Error( 45 'Element of \'css\' array must be a ' + 46 'list of valid compound selectors: ' + 47 selectors[i]); 48 } 49 selectors[i] = canonicalizedSelector; 50 } 51 } 52 53 // Setup all data types for the declarative content API. 54 declarativeContent.PageStateMatcher = function(parameters) { 55 setupInstance(this, parameters, 'PageStateMatcher'); 56 if ($Object.hasOwnProperty(this, 'css')) { 57 canonicalizeCssSelectors(this.css); 58 } 59 }; 60 declarativeContent.ShowPageAction = function(parameters) { 61 setupInstance(this, parameters, 'ShowPageAction'); 62 }; 63}); 64 65exports.binding = binding.generate(); 66