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Issue 22801009: Bring the rest of the polymer.dart code from github. (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart
Patch Set: Created 7 years, 4 months ago
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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 // This script dynamically prepares a set of files to run polymer.dart. It uses 5 // This script dynamically prepares a set of files to run polymer.dart. It uses
6 // the html_import polyfill to search for all imported files, then 6 // the html_import polyfill to search for all imported files, then
7 // it inlines all <polymer-element> definitions on the top-level page (needed by 7 // it inlines all <polymer-element> definitions on the top-level page (needed by
8 // registerPolymerElement), and it removes script tags that appear inside 8 // registerPolymerElement), and it removes script tags that appear inside
9 // those tags. It finally rewrites the main entrypoint to call an initialization 9 // those tags. It finally rewrites the main entrypoint to call an initialization
10 // function on each of the declared <polymer-elements>. 10 // function on each of the declared <polymer-elements>.
(...skipping 41 matching lines...) Expand 10 before | Expand all | Expand 10 after
52 if (!navigator.webkitStartDart) { 52 if (!navigator.webkitStartDart) {
53 // TODO(sigmund): rephrase when we split build.dart in two: analysis vs 53 // TODO(sigmund): rephrase when we split build.dart in two: analysis vs
54 // deploy pieces. 54 // deploy pieces.
55 console.warn('boot.js only works in Dartium. Run the build.dart' + 55 console.warn('boot.js only works in Dartium. Run the build.dart' +
56 ' tool to compile a depolyable JavaScript version') 56 ' tool to compile a depolyable JavaScript version')
57 return; 57 return;
58 } 58 }
59 document.write( 59 document.write(
60 '<script src="packages/html_import/html_import.min.js"></script>'); 60 '<script src="packages/html_import/html_import.min.js"></script>');
61 61
62 // Whether [node] is under `<body>` or `<head>` and not nested in an
63 // `<element>` or `<polymer-element>` tag.
64 function isTopLevel(node) {
65 var parent = node.parentNode;
66 if (parent == null || parent == document.body || parent == document.head) {
67 return true;
68 }
69 if (parent.localName && (
70 parent.localName == 'element' ||
71 parent.localName == 'polymer-element')) {
72 return false;
73 }
74 return isTopLevel(parent);
75 }
76
77 // Extract a Dart import URL from a script tag, which is the 'src' attribute 62 // Extract a Dart import URL from a script tag, which is the 'src' attribute
78 // of the script tag, or a data-url with the script contents for inlined code. 63 // of the script tag, or a data-url with the script contents for inlined code.
79 function getScriptUrl(script) { 64 function getScriptUrl(script) {
80 var url = script.src; 65 var url = script.src;
81 if (url) { 66 if (url) {
82 // Normalize package: urls 67 // Normalize package: urls
83 var index = url.indexOf('packages/'); 68 var index = url.indexOf('packages/');
84 if (index == 0 || (index > 0 && url[index - 1] == '/')) { 69 if (index == 0 || (index > 0 && url[index - 1] == '/')) {
85 url = "package:" + url.slice(index + 9); 70 url = "package:" + url.slice(index + 9);
86 } 71 }
87 72 return url;
88 // TODO(sigmund): remove the timestamp. We added this to work around
89 // a caching bug in dartium (see http://dartbug.com/12074). Note this
90 // doesn't fix caching problems with other libraries imported further in,
91 // and it can also introduce canonicalization problems if the files under
92 // these urls are being imported from other libraries.
93 var time = new Date().getTime();
94 return url + '?' + time;
95 } else { 73 } else {
96 // TODO(sigmund): investigate how to eliminate the warning in Dartium 74 // TODO(sigmund): investigate how to eliminate the warning in Dartium
97 // (changing to text/javascript hides the warning, but seems wrong). 75 // (changing to text/javascript hides the warning, but seems wrong).
98 return "data:application/dart;base64," + window.btoa(script.textContent); 76 return "data:application/dart;base64," + window.btoa(script.textContent);
99 } 77 }
100 } 78 }
101 79
102 // Moves <polymer-elements> from imported documents into the top-level page. 80 // Moves <polymer-elements> from imported documents into the top-level page.
103 function inlinePolymerElements(content, ref, seen) { 81 function inlinePolymerElements(content, ref, seen) {
104 if (!seen) seen = {}; 82 if (!seen) seen = {};
105 var links = content.querySelectorAll('link[rel="import"]'); 83 var links = content.querySelectorAll('link[rel="import"]');
106 for (var i = 0; i < links.length; i++) { 84 for (var i = 0; i < links.length; i++) {
107 var link = links[i].import; 85 var link = links[i].import;
108 if (seen[link.href]) continue; 86 if (seen[link.href]) continue;
109 seen[link.href] = link; 87 seen[link.href] = link;
110 inlinePolymerElements(link.content, ref, seen); 88 inlinePolymerElements(link.content, ref, seen);
111 } 89 }
112 90
113 if (content != document) { // no need to do anything for the top-level page 91 if (content != document) { // no need to do anything for the top-level page
114 var elements = content.querySelectorAll('polymer-element'); 92 var elements = content.querySelectorAll('polymer-element');
115 for (var i = 0; i < elements.length; i++) { 93 for (var i = 0; i < elements.length; i++) {
116 document.body.insertBefore(elements[i], ref); 94 document.body.insertBefore(elements[i], ref);
117 } 95 }
118 } 96 }
119 } 97 }
120 98
121 // Creates a Dart program that imports [urls] and [mainUrl] and invokes the 99 // Creates a Dart program that imports [urls] and passes them to initPolymer
122 // _init methods of each library in urls (if present) followed by the main 100 // (which in turn will invoke their main function, their methods marked with
123 // method of [mainUrl]. 101 // @initMethod, and register any custom tag labeled with @CustomTag).
124 function createMain(urls, mainUrl) { 102 function createMain(urls, mainUrl) {
125 var imports = Array(urls.length + 2); 103 var imports = Array(urls.length + 1);
126 for (var i = 0; i < urls.length; ++i) { 104 for (var i = 0; i < urls.length; ++i) {
127 imports[i] = 'import "' + urls[i] + '" as i' + i + ';'; 105 imports[i] = 'import "' + urls[i] + '" as i' + i + ';';
128 } 106 }
129 imports[urls.length] = 'import "package:polymer/polymer.dart" as polymer;'; 107 imports[urls.length] = 'import "package:polymer/polymer.dart" as polymer;';
130 imports[urls.length + 1 ] = 'import "' + mainUrl + '" as userMain;'; 108 var arg = urls.length == 0 ? '[]' :
131 var firstArg = urls.length == 0 ? '[]' :
132 ('[\n "' + urls.join('",\n "') + '"\n ]'); 109 ('[\n "' + urls.join('",\n "') + '"\n ]');
133 return (imports.join('\n') + 110 return (imports.join('\n') +
134 '\n\nmain() {\n' + 111 '\n\nmain() {\n' +
135 ' polymer.initPolymer(' + firstArg + ', userMain.main);\n' + 112 ' polymer.initPolymer(' + arg + ');\n' +
136 '}\n'); 113 '}\n');
137 } 114 }
138 115
139 // Finds all top-level <script> tags, and <script> tags in custom elements 116 // Finds all top-level <script> tags, and <script> tags in custom elements
140 // and merges them into a single entrypoint. 117 // and merges them into a single entrypoint.
141 function mergeScripts() { 118 function mergeScripts() {
142 var scripts = document.getElementsByTagName("script"); 119 var scripts = document.getElementsByTagName("script");
143 var length = scripts.length; 120 var length = scripts.length;
144 121
145 var dartScripts = []
146 var urls = []; 122 var urls = [];
123 var toRemove = [];
147 124
148 // Collect the information we need to replace the script tags 125 // Collect the information we need to replace the script tags
149 for (var i = 0; i < length; ++i) { 126 for (var i = 0; i < length; ++i) {
150 var script = scripts[i]; 127 var script = scripts[i];
151 if (script.type == "application/dart") { 128 if (script.type == "application/dart") {
152 dartScripts.push(script);
153 if (isTopLevel(script)) continue;
154 urls.push(getScriptUrl(script)); 129 urls.push(getScriptUrl(script));
130 toRemove.push(script);
155 } 131 }
156 } 132 }
157 133
158 // Removes all the original script tags under elements, and replace 134 toRemove.forEach(function (s) { s.parentNode.removeChild(s); });
159 // top-level script tags so we first call each element's _init. 135
160 for (var i = 0; i < dartScripts.length; ++i) { 136 // Append a new script tag that initializes everything.
161 var script = dartScripts[i]; 137 var newScript = document.createElement('script');
162 if (isTopLevel(script)) { 138 newScript.type = "application/dart";
163 var newScript = document.createElement('script'); 139 newScript.textContent = createMain(urls);
164 newScript.type = "application/dart"; 140 document.body.appendChild(newScript);
165 newScript.textContent = createMain(urls, getScriptUrl(script));
166 script.parentNode.replaceChild(newScript, script);
167 } else {
168 script.parentNode.removeChild(script);
169 }
170 }
171 } 141 }
172 142
173 var alreadyRan = false; 143 var alreadyRan = false;
174 window.addEventListener('HTMLImportsLoaded', function (e) { 144 window.addEventListener('HTMLImportsLoaded', function (e) {
175 if (alreadyRan) { 145 if (alreadyRan) {
176 console.warn('HTMLImportsLoaded fired again.'); 146 console.warn('HTMLImportsLoaded fired again.');
177 return; 147 return;
178 } 148 }
179 alreadyRan = true; 149 alreadyRan = true;
180 var ref = document.body.children[0]; 150 var ref = document.body.children[0];
181 inlinePolymerElements(document, ref); 151 inlinePolymerElements(document, ref);
182 mergeScripts(); 152 mergeScripts();
183 if (!navigator.webkitStartDart()) { 153 if (!navigator.webkitStartDart()) {
184 document.body.innerHTML = 'This build has expired. Please download a ' + 154 document.body.innerHTML = 'This build has expired. Please download a ' +
185 'new Dartium at http://www.dartlang.org/dartium/index.html'; 155 'new Dartium at http://www.dartlang.org/dartium/index.html';
186 } 156 }
187 }); 157 });
188 })(); 158 })();
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