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| 1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file | |
| 2 // for details. All rights reserved. Use of this source code is governed by a | |
| 3 // BSD-style license that can be found in the LICENSE file. | |
| 4 | |
| 5 /// Includes any additional polyfills that may needed by the deployed app. | |
| 6 library polymer.src.build.polyfill_injector; | |
| 7 | |
| 8 import 'dart:async'; | |
| 9 | |
| 10 import 'package:barback/barback.dart'; | |
| 11 import 'package:html5lib/dom.dart' show | |
| 12 Document, DocumentFragment, Element, Node; | |
| 13 import 'package:html5lib/parser.dart' show parseFragment; | |
| 14 import 'package:code_transformers/messages/build_logger.dart'; | |
| 15 import 'common.dart'; | |
| 16 | |
| 17 /// Ensures that any scripts and polyfills needed to run a polymer application | |
| 18 /// are included. | |
| 19 /// | |
| 20 /// This step also replaces "packages/browser/dart.js" and the Dart script tag | |
| 21 /// with a script tag that loads the dart2js compiled code directly. | |
| 22 class PolyfillInjector extends Transformer with PolymerTransformer { | |
| 23 final TransformOptions options; | |
| 24 | |
| 25 PolyfillInjector(this.options); | |
| 26 | |
| 27 /// Only run on entry point .html files. | |
| 28 // TODO(nweiz): This should just take an AssetId when barback <0.13.0 support | |
| 29 // is dropped. | |
| 30 Future<bool> isPrimary(idOrAsset) { | |
| 31 var id = idOrAsset is AssetId ? idOrAsset : idOrAsset.id; | |
| 32 return new Future.value(options.isHtmlEntryPoint(id)); | |
| 33 } | |
| 34 | |
| 35 Future apply(Transform transform) { | |
| 36 var logger = new BuildLogger(transform, | |
| 37 convertErrorsToWarnings: !options.releaseMode, | |
| 38 detailsUri: 'http://goo.gl/5HPeuP'); | |
| 39 return readPrimaryAsHtml(transform, logger).then((document) { | |
| 40 bool dartSupportFound = false; | |
| 41 Element webComponentsJs; | |
| 42 Element dartJs; | |
| 43 final dartScripts = <Element>[]; | |
| 44 | |
| 45 for (var tag in document.querySelectorAll('script')) { | |
| 46 var src = tag.attributes['src']; | |
| 47 if (src != null) { | |
| 48 var last = src.split('/').last; | |
| 49 if (_webComponentsJS.hasMatch(last)) { | |
| 50 webComponentsJs = tag; | |
| 51 } else if (_platformJS.hasMatch(last)) { | |
| 52 tag.attributes['src'] = src.replaceFirst( | |
| 53 _platformJS, 'webcomponents.min.js'); | |
| 54 webComponentsJs = tag; | |
| 55 } else if (_dartSupportJS.hasMatch(last)) { | |
| 56 dartSupportFound = true; | |
| 57 } else if (last == 'dart.js') { | |
| 58 dartJs = tag; | |
| 59 } | |
| 60 } | |
| 61 | |
| 62 if (tag.attributes['type'] == 'application/dart') { | |
| 63 dartScripts.add(tag); | |
| 64 } | |
| 65 } | |
| 66 | |
| 67 if (dartScripts.isEmpty) { | |
| 68 // This HTML has no Dart code, there is nothing to do here. | |
| 69 transform.addOutput(transform.primaryInput); | |
| 70 return; | |
| 71 } | |
| 72 | |
| 73 // Remove "packages/browser/dart.js". It is not needed in release mode, | |
| 74 // and in debug mode we want to ensure it is the last script on the page. | |
| 75 if (dartJs != null) dartJs.remove(); | |
| 76 | |
| 77 // TODO(jmesserly): ideally we would generate an HTML that loads | |
| 78 // dart2dart too. But for now dart2dart is not a supported deployment | |
| 79 // target, so just inline the JS script. This has the nice side effect of | |
| 80 // fixing our tests: even if content_shell supports Dart VM, we'll still | |
| 81 // test the compiled JS code. | |
| 82 if (options.directlyIncludeJS) { | |
| 83 // Replace all other Dart script tags with JavaScript versions. | |
| 84 for (var script in dartScripts) { | |
| 85 final src = script.attributes['src']; | |
| 86 if (src.endsWith('.dart')) { | |
| 87 script.attributes.remove('type'); | |
| 88 script.attributes['src'] = '$src.js'; | |
| 89 // TODO(sigmund): we shouldn't need 'async' here. Remove this | |
| 90 // workaround for dartbug.com/19653. | |
| 91 script.attributes['async'] = ''; | |
| 92 } | |
| 93 } | |
| 94 } else { | |
| 95 document.body.nodes.add(parseFragment( | |
| 96 '<script src="packages/browser/dart.js"></script>')); | |
| 97 } | |
| 98 | |
| 99 _addScriptFirst(urlSegment) { | |
| 100 document.head.nodes.insert(0, parseFragment( | |
| 101 '<script src="packages/$urlSegment"></script>\n')); | |
| 102 } | |
| 103 | |
| 104 // Inserts dart_support.js either at the top of the document or directly | |
| 105 // after webcomponents.js if it exists. | |
| 106 if (!dartSupportFound) { | |
| 107 if (webComponentsJs == null) { | |
| 108 _addScriptFirst('web_components/dart_support.js'); | |
| 109 } else { | |
| 110 var parentsNodes = webComponentsJs.parentNode.nodes; | |
| 111 parentsNodes.insert( | |
| 112 parentsNodes.indexOf(webComponentsJs) + 1, | |
| 113 parseFragment( | |
| 114 '\n<script src="packages/web_components/dart_support.js">' | |
| 115 '</script>')); | |
| 116 } | |
| 117 } | |
| 118 | |
| 119 // By default webcomponents.js should come before all other scripts. | |
| 120 if (webComponentsJs == null && options.injectWebComponentsJs) { | |
| 121 var suffix = options.releaseMode ? '.min.js' : '.js'; | |
| 122 _addScriptFirst('web_components/webcomponents$suffix'); | |
| 123 } | |
| 124 | |
| 125 transform.addOutput( | |
| 126 new Asset.fromString(transform.primaryInput.id, document.outerHtml)); | |
| 127 }); | |
| 128 } | |
| 129 } | |
| 130 | |
| 131 final _platformJS = new RegExp(r'platform.*\.js', caseSensitive: false); | |
| 132 final _webComponentsJS = | |
| 133 new RegExp(r'webcomponents.*\.js', caseSensitive: false); | |
| 134 final _dartSupportJS = new RegExp(r'dart_support.js', caseSensitive: false); | |
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Chromium Code Reviews
Issue 794473002:
Delete polymer from the Dart repo (Closed)
Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart