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| 1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file | 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 | 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. | 3 // BSD-style license that can be found in the LICENSE file. |
| 4 | 4 |
| 5 part of polymer; | 5 part of polymer; |
| 6 | 6 |
| 7 /** Annotation used to automatically register polymer elements. */ | 7 /// Annotation used to automatically register polymer elements. |
| 8 class CustomTag { | 8 class CustomTag { |
| 9 final String tagName; | 9 final String tagName; |
| 10 const CustomTag(this.tagName); | 10 const CustomTag(this.tagName); |
| 11 } | 11 } |
| 12 | 12 |
| 13 /** | 13 /// Metadata used to label static or top-level methods that are called |
| 14 * Metadata used to label static or top-level methods that are called | 14 /// automatically when loading the library of a custom element. |
| 15 * automatically when loading the library of a custom element. | |
| 16 */ | |
| 17 const initMethod = const _InitMethodAnnotation(); | 15 const initMethod = const _InitMethodAnnotation(); |
| 18 | 16 |
| 19 /** | 17 /// Initializes a polymer application as follows: |
| 20 * Initializes a polymer application as follows: | 18 /// * set up up polling for observable changes |
| 21 * * set up up polling for observable changes | 19 /// * initialize Model-Driven Views |
| 22 * * initialize Model-Driven Views | 20 /// * Include some style to prevent flash of unstyled content (FOUC) |
| 23 * * Include some style to prevent flash of unstyled content (FOUC) | 21 /// * for each library included transitively from HTML and HTML imports, |
| 24 * * for each library included transitively from HTML and HTML imports, | 22 /// register custom elements declared there (labeled with [CustomTag]) and |
| 25 * register custom elements declared there (labeled with [CustomTag]) and | 23 /// invoke the initialization method on it (top-level functions annotated with |
| 26 * invoke the initialization method on it (top-level functions annotated with | 24 /// [initMethod]). |
| 27 * [initMethod]). | |
| 28 */ | |
| 29 Zone initPolymer() { | 25 Zone initPolymer() { |
| 30 // We use this pattern, and not the inline lazy initialization pattern, so we | 26 // We use this pattern, and not the inline lazy initialization pattern, so we |
| 31 // can help dart2js detect that _discoverInitializers can be tree-shaken for | 27 // can help dart2js detect that _discoverInitializers can be tree-shaken for |
| 32 // deployment (and hence all uses of dart:mirrors from this loading logic). | 28 // deployment (and hence all uses of dart:mirrors from this loading logic). |
| 33 // TODO(sigmund): fix polymer's transformers so they can replace initPolymer | 29 // TODO(sigmund): fix polymer's transformers so they can replace initPolymer |
| 34 // by initPolymerOptimized. | 30 // by initPolymerOptimized. |
| 35 if (_initializers == null) _initializers = _discoverInitializers(); | 31 if (_initializers == null) _initializers = _discoverInitializers(); |
| 36 | 32 |
| 37 // In deployment mode, we rely on change notifiers instead of dirty checking. | 33 // In deployment mode, we rely on change notifiers instead of dirty checking. |
| 38 if (!_deployMode) { | 34 if (!_deployMode) { |
| 39 return dirtyCheckZone()..run(initPolymerOptimized); | 35 return dirtyCheckZone()..run(initPolymerOptimized); |
| 40 } | 36 } |
| 41 | 37 |
| 42 return initPolymerOptimized(); | 38 return initPolymerOptimized(); |
| 43 } | 39 } |
| 44 | 40 |
| 45 /** | 41 /// Same as [initPolymer], but runs the version that is optimized for deployment |
| 46 * Same as [initPolymer], but runs the version that is optimized for deployment | 42 /// to the internet. The biggest difference is it omits the [Zone] that |
| 47 * to the internet. The biggest difference is it omits the [Zone] that | 43 /// automatically invokes [Observable.dirtyCheck], and the list of initializers |
| 48 * automatically invokes [Observable.dirtyCheck], and the list of initializers | 44 /// must be supplied instead of being dynamically searched for at runtime using |
| 49 * must be supplied instead of being dynamically searched for at runtime using | 45 /// mirrors. |
| 50 * mirrors. | |
| 51 */ | |
| 52 Zone initPolymerOptimized() { | 46 Zone initPolymerOptimized() { |
| 53 // TODO(sigmund): refactor this so we can replace it by codegen. | 47 // TODO(sigmund): refactor this so we can replace it by codegen. |
| 54 smoke.useMirrors(); | 48 smoke.useMirrors(); |
| 55 // TODO(jmesserly): there is some code in src/declaration/polymer-element.js, | 49 // TODO(jmesserly): there is some code in src/declaration/polymer-element.js, |
| 56 // git version 37eea00e13b9f86ab21c85a955585e8e4237e3d2, right before | 50 // git version 37eea00e13b9f86ab21c85a955585e8e4237e3d2, right before |
| 57 // it registers polymer-element, which uses Platform.deliverDeclarations to | 51 // it registers polymer-element, which uses Platform.deliverDeclarations to |
| 58 // coordinate with HTML Imports. I don't think we need it so skipping. | 52 // coordinate with HTML Imports. I don't think we need it so skipping. |
| 59 document.register(PolymerDeclaration._TAG, PolymerDeclaration); | 53 document.register(PolymerDeclaration._TAG, PolymerDeclaration); |
| 60 | 54 |
| 61 for (var initializer in _initializers) { | 55 for (var initializer in _initializers) { |
| 62 initializer(); | 56 initializer(); |
| 63 } | 57 } |
| 64 | 58 |
| 65 // Run this after user code so they can add to Polymer.veiledElements | 59 // Run this after user code so they can add to Polymer.veiledElements |
| 66 _preventFlashOfUnstyledContent(); | 60 _preventFlashOfUnstyledContent(); |
| 67 | 61 |
| 68 customElementsReady.then((_) => Polymer._ready.complete()); | 62 customElementsReady.then((_) => Polymer._ready.complete()); |
| 69 return Zone.current; | 63 return Zone.current; |
| 70 } | 64 } |
| 71 | 65 |
| 72 /** | 66 /// Configures [initPolymer] making it optimized for deployment to the internet. |
| 73 * Configures [initPolymer] making it optimized for deployment to the internet. | 67 /// With this setup the initializer list is supplied instead of searched for |
| 74 * With this setup the initializer list is supplied instead of being dynamically | 68 /// at runtime. Additionally, after this method is called [initPolymer] omits |
| 75 * searched for at runtime. Additionally, after this method is called, | 69 /// the [Zone] that automatically invokes [Observable.dirtyCheck]. |
| 76 * [initPolymer] omits the [Zone] that automatically invokes | |
| 77 * [Observable.dirtyCheck]. | |
| 78 */ | |
| 79 void configureForDeployment(List<Function> initializers) { | 70 void configureForDeployment(List<Function> initializers) { |
| 80 _initializers = initializers; | 71 _initializers = initializers; |
| 81 _deployMode = true; | 72 _deployMode = true; |
| 82 } | 73 } |
| 83 | 74 |
| 84 /** | 75 /// List of initializers that by default will be executed when calling |
| 85 * List of initializers that by default will be executed when calling | 76 /// initPolymer. If null, initPolymer will compute the list of initializers by |
| 86 * initPolymer. If null, initPolymer will compute the list of initializers by | 77 /// crawling HTML imports, searchfing for script tags, and including an |
| 87 * crawling HTML imports, searchfing for script tags, and including an | 78 /// initializer for each type tagged with a [CustomTag] annotation and for each |
| 88 * initializer for each type tagged with a [CustomTag] annotation and for each | 79 /// top-level method annotated with [initMethod]. The value of this field is |
| 89 * top-level method annotated with [initMethod]. The value of this field is | 80 /// assigned programatically by the code generated from the polymer deploy |
| 90 * assigned programatically by the code generated from the polymer deploy | 81 /// scripts. |
| 91 * scripts. | |
| 92 */ | |
| 93 List<Function> _initializers; | 82 List<Function> _initializers; |
| 94 | 83 |
| 95 /** True if we're in deployment mode. */ | 84 /// True if we're in deployment mode. |
| 96 bool _deployMode = false; | 85 bool _deployMode = false; |
| 97 | 86 |
| 98 List<Function> _discoverInitializers() { | 87 List<Function> _discoverInitializers() { |
| 99 var initializers = []; | 88 var initializers = []; |
| 100 var librariesToLoad = _discoverScripts(document, window.location.href); | 89 var librariesToLoad = _discoverScripts(document, window.location.href); |
| 101 for (var lib in librariesToLoad) { | 90 for (var lib in librariesToLoad) { |
| 102 try { | 91 try { |
| 103 _loadLibrary(lib, initializers); | 92 _loadLibrary(lib, initializers); |
| 104 } catch (e, s) { | 93 } catch (e, s) { |
| 105 // Deliver errors async, so if a single library fails it doesn't prevent | 94 // Deliver errors async, so if a single library fails it doesn't prevent |
| 106 // other things from loading. | 95 // other things from loading. |
| 107 new Completer().completeError(e, s); | 96 new Completer().completeError(e, s); |
| 108 } | 97 } |
| 109 } | 98 } |
| 110 return initializers; | 99 return initializers; |
| 111 } | 100 } |
| 112 | 101 |
| 113 /** | 102 /// Walks the HTML import structure to discover all script tags that are |
| 114 * Walks the HTML import structure to discover all script tags that are | 103 /// implicitly loaded. This code is only used in Dartium and should only be |
| 115 * implicitly loaded. This code is only used in Dartium and should only be | 104 /// called after all HTML imports are resolved. Polymer ensures this by asking |
| 116 * called after all HTML imports are resolved. Polymer ensures this by asking | 105 /// users to put their Dart script tags after all HTML imports (this is checked |
| 117 * users to put their Dart script tags after all HTML imports (this is checked | 106 /// by the linter, and Dartium will otherwise show an error message). |
| 118 * by the linter, and Dartium will otherwise show an error message). | |
| 119 */ | |
| 120 List<String> _discoverScripts(Document doc, String baseUri, | 107 List<String> _discoverScripts(Document doc, String baseUri, |
| 121 [Set<Document> seen, List<String> scripts]) { | 108 [Set<Document> seen, List<String> scripts]) { |
| 122 if (seen == null) seen = new Set<Document>(); | 109 if (seen == null) seen = new Set<Document>(); |
| 123 if (scripts == null) scripts = <String>[]; | 110 if (scripts == null) scripts = <String>[]; |
| 124 if (doc == null) { | 111 if (doc == null) { |
| 125 print('warning: $baseUri not found.'); | 112 print('warning: $baseUri not found.'); |
| 126 return scripts; | 113 return scripts; |
| 127 } | 114 } |
| 128 if (seen.contains(doc)) return scripts; | 115 if (seen.contains(doc)) return scripts; |
| 129 seen.add(doc); | 116 seen.add(doc); |
| 130 | 117 |
| 131 bool scriptSeen = false; | 118 bool scriptSeen = false; |
| 132 for (var node in doc.querySelectorAll('script,link[rel="import"]')) { | 119 for (var node in doc.querySelectorAll('script,link[rel="import"]')) { |
| 133 if (node is LinkElement) { | 120 if (node is LinkElement) { |
| 134 _discoverScripts(node.import, node.href, seen, scripts); | 121 _discoverScripts(node.import, node.href, seen, scripts); |
| 135 } else if (node is ScriptElement && node.type == 'application/dart') { | 122 } else if (node is ScriptElement && node.type == 'application/dart') { |
| 136 if (!scriptSeen) { | 123 if (!scriptSeen) { |
| 137 var url = node.src; | 124 var url = node.src; |
| 138 scripts.add(url == '' ? baseUri : url); | 125 scripts.add(url == '' ? baseUri : url); |
| 139 scriptSeen = true; | 126 scriptSeen = true; |
| 140 } else { | 127 } else { |
| 141 print('warning: more than one Dart script tag in $baseUri. Dartium ' | 128 print('warning: more than one Dart script tag in $baseUri. Dartium ' |
| 142 'currently only allows a single Dart script tag per document.'); | 129 'currently only allows a single Dart script tag per document.'); |
| 143 } | 130 } |
| 144 } | 131 } |
| 145 } | 132 } |
| 146 return scripts; | 133 return scripts; |
| 147 } | 134 } |
| 148 | 135 |
| 149 /** All libraries in the current isolate. */ | 136 /// All libraries in the current isolate. |
| 150 final _libs = currentMirrorSystem().libraries; | 137 final _libs = currentMirrorSystem().libraries; |
| 151 | 138 |
| 152 // TODO(sigmund): explore other (cheaper) ways to resolve URIs relative to the | 139 // TODO(sigmund): explore other (cheaper) ways to resolve URIs relative to the |
| 153 // root library (see dartbug.com/12612) | 140 // root library (see dartbug.com/12612) |
| 154 final _rootUri = currentMirrorSystem().isolate.rootLibrary.uri; | 141 final _rootUri = currentMirrorSystem().isolate.rootLibrary.uri; |
| 155 | 142 |
| 156 final Logger _loaderLog = new Logger('polymer.loader'); | 143 final Logger _loaderLog = new Logger('polymer.loader'); |
| 157 | 144 |
| 158 bool _isHttpStylePackageUrl(Uri uri) { | 145 bool _isHttpStylePackageUrl(Uri uri) { |
| 159 var uriPath = uri.path; | 146 var uriPath = uri.path; |
| 160 return uri.scheme == _rootUri.scheme && | 147 return uri.scheme == _rootUri.scheme && |
| 161 // Don't process cross-domain uris. | 148 // Don't process cross-domain uris. |
| 162 uri.authority == _rootUri.authority && | 149 uri.authority == _rootUri.authority && |
| 163 uriPath.endsWith('.dart') && | 150 uriPath.endsWith('.dart') && |
| 164 (uriPath.contains('/packages/') || uriPath.startsWith('packages/')); | 151 (uriPath.contains('/packages/') || uriPath.startsWith('packages/')); |
| 165 } | 152 } |
| 166 | 153 |
| 167 /** | 154 /// Reads the library at [uriString] (which can be an absolute URI or a relative |
| 168 * Reads the library at [uriString] (which can be an absolute URI or a relative | 155 /// URI from the root library), and: |
| 169 * URI from the root library), and: | 156 /// |
| 170 * | 157 /// * If present, invokes any top-level and static functions marked |
| 171 * * If present, invokes any top-level and static functions marked | 158 /// with the [initMethod] annotation (in the order they appear). |
| 172 * with the [initMethod] annotation (in the order they appear). | 159 /// |
| 173 * | 160 /// * Registers any [PolymerElement] that is marked with the [CustomTag] |
| 174 * * Registers any [PolymerElement] that is marked with the [CustomTag] | 161 /// annotation. |
| 175 * annotation. | |
| 176 */ | |
| 177 void _loadLibrary(String uriString, List<Function> initializers) { | 162 void _loadLibrary(String uriString, List<Function> initializers) { |
| 178 var uri = _rootUri.resolve(uriString); | 163 var uri = _rootUri.resolve(uriString); |
| 179 var lib = _libs[uri]; | 164 var lib = _libs[uri]; |
| 180 if (_isHttpStylePackageUrl(uri)) { | 165 if (_isHttpStylePackageUrl(uri)) { |
| 181 // Use package: urls if available. This rule here is more permissive than | 166 // Use package: urls if available. This rule here is more permissive than |
| 182 // how we translate urls in polymer-build, but we expect Dartium to limit | 167 // how we translate urls in polymer-build, but we expect Dartium to limit |
| 183 // the cases where there are differences. The polymer-build issues an error | 168 // the cases where there are differences. The polymer-build issues an error |
| 184 // when using packages/ inside lib without properly stepping out all the way | 169 // when using packages/ inside lib without properly stepping out all the way |
| 185 // to the packages folder. If users don't create symlinks in the source | 170 // to the packages folder. If users don't create symlinks in the source |
| 186 // tree, then Dartium will also complain because it won't find the file seen | 171 // tree, then Dartium will also complain because it won't find the file seen |
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| 240 print("warning: methods marked with @initMethod should take no " | 225 print("warning: methods marked with @initMethod should take no " |
| 241 "arguments, ${method.simpleName} expects some."); | 226 "arguments, ${method.simpleName} expects some."); |
| 242 return; | 227 return; |
| 243 } | 228 } |
| 244 initializers.add(() => obj.invoke(method.simpleName, const [])); | 229 initializers.add(() => obj.invoke(method.simpleName, const [])); |
| 245 } | 230 } |
| 246 | 231 |
| 247 class _InitMethodAnnotation { | 232 class _InitMethodAnnotation { |
| 248 const _InitMethodAnnotation(); | 233 const _InitMethodAnnotation(); |
| 249 } | 234 } |
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