| Index: pkg/polymer/lib/boot.js
|
| diff --git a/pkg/polymer/lib/boot.js b/pkg/polymer/lib/boot.js
|
| new file mode 100644
|
| index 0000000000000000000000000000000000000000..15e43865616746767be633e7837d23667a306e44
|
| --- /dev/null
|
| +++ b/pkg/polymer/lib/boot.js
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| @@ -0,0 +1,188 @@
|
| +// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
|
| +// for details. All rights reserved. Use of this source code is governed by a
|
| +// BSD-style license that can be found in the LICENSE file.
|
| +
|
| +// This script dynamically prepares a set of files to run polymer.dart. It uses
|
| +// the html_import polyfill to search for all imported files, then
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| +// it inlines all <polymer-element> definitions on the top-level page (needed by
|
| +// registerPolymerElement), and it removes script tags that appear inside
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| +// those tags. It finally rewrites the main entrypoint to call an initialization
|
| +// function on each of the declared <polymer-elements>.
|
| +//
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| +// This script is needed only when running polymer.dart in Dartium. It should be
|
| +// removed by the polymer deployment commands.
|
| +
|
| +// As an example, given an input of this form:
|
| +// <polymer-element name="c1">
|
| +// <template></template>
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| +// <script type="application/dart" src="url0.dart"></script>
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| +// </polymer-element>
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| +// <element name="c2">
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| +// <template></template>
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| +// <script type="application/dart">main() => { print('body2'); }</script>
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| +// </element>
|
| +// <c1></c1>
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| +// <c2></c2>
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| +// <script type="application/dart" src="url2.dart"></script>
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| +// <script src="packages/polymer/boot.js"></script>
|
| +//
|
| +// This script will simplifies the page as follows:
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| +// <polymer-element name="c1">
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| +// <template></template>
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| +// </polymer-element>
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| +// <polymer-element name="c2">
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| +// <template></template>
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| +// </polymer-element>
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| +// <c1></c1>
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| +// <c2></c2>
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| +// <script type="application/dart">
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| +// import 'url0.dart' as i0;
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| +// import "data:application/dart;base64,CiAgICBtYWluKCkgewogICAgICBwcmludCgnYm9keTInKTsKICAgIH0KICAgIA==" as i1;
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| +// import 'url2.dart' as i2;
|
| +// ...
|
| +// main() {
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| +// // code that checks which libraries have a 'main' and invokes them.
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| +// // practically equivalent to: i0._init(); i1._init(); i2.main();
|
| +// }
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| +// </script>
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| +
|
| +
|
| +(function() {
|
| + // Only run in Dartium.
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| + if (!navigator.webkitStartDart) {
|
| + // TODO(sigmund): rephrase when we split build.dart in two: analysis vs
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| + // deploy pieces.
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| + console.warn('boot.js only works in Dartium. Run the build.dart' +
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| + ' tool to compile a depolyable JavaScript version')
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| + return;
|
| + }
|
| + document.write(
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| + '<script src="packages/html_import/html_import.min.js"></script>');
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| +
|
| + // Whether [node] is under `<body>` or `<head>` and not nested in an
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| + // `<element>` or `<polymer-element>` tag.
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| + function isTopLevel(node) {
|
| + var parent = node.parentNode;
|
| + if (parent == null || parent == document.body || parent == document.head) {
|
| + return true;
|
| + }
|
| + if (parent.localName && (
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| + parent.localName == 'element' ||
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| + parent.localName == 'polymer-element')) {
|
| + return false;
|
| + }
|
| + return isTopLevel(parent);
|
| + }
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| +
|
| + // Extract a Dart import URL from a script tag, which is the 'src' attribute
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| + // of the script tag, or a data-url with the script contents for inlined code.
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| + function getScriptUrl(script) {
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| + var url = script.src;
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| + if (url) {
|
| + // Normalize package: urls
|
| + var index = url.indexOf('packages/');
|
| + if (index == 0 || (index > 0 && url[index - 1] == '/')) {
|
| + url = "package:" + url.slice(index + 9);
|
| + }
|
| +
|
| + // TODO(sigmund): remove the timestamp. We added this to work around
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| + // a caching bug in dartium (see http://dartbug.com/12074). Note this
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| + // doesn't fix caching problems with other libraries imported further in,
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| + // and it can also introduce canonicalization problems if the files under
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| + // these urls are being imported from other libraries.
|
| + var time = new Date().getTime();
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| + return url + '?' + time;
|
| + } else {
|
| + // TODO(sigmund): investigate how to eliminate the warning in Dartium
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| + // (changing to text/javascript hides the warning, but seems wrong).
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| + return "data:application/dart;base64," + window.btoa(script.textContent);
|
| + }
|
| + }
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| +
|
| + // Moves <polymer-elements> from imported documents into the top-level page.
|
| + function inlinePolymerElements(content, ref, seen) {
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| + if (!seen) seen = {};
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| + var links = content.querySelectorAll('link[rel="import"]');
|
| + for (var i = 0; i < links.length; i++) {
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| + var link = links[i].import;
|
| + if (seen[link.href]) continue;
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| + seen[link.href] = link;
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| + inlinePolymerElements(link.content, ref, seen);
|
| + }
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| +
|
| + if (content != document) { // no need to do anything for the top-level page
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| + var elements = content.querySelectorAll('polymer-element');
|
| + for (var i = 0; i < elements.length; i++) {
|
| + document.body.insertBefore(elements[i], ref);
|
| + }
|
| + }
|
| + }
|
| +
|
| + // Creates a Dart program that imports [urls] and [mainUrl] and invokes the
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| + // _init methods of each library in urls (if present) followed by the main
|
| + // method of [mainUrl].
|
| + function createMain(urls, mainUrl) {
|
| + var imports = Array(urls.length + 2);
|
| + for (var i = 0; i < urls.length; ++i) {
|
| + imports[i] = 'import "' + urls[i] + '" as i' + i + ';';
|
| + }
|
| + imports[urls.length] = 'import "package:polymer/polymer.dart" as polymer;';
|
| + imports[urls.length + 1 ] = 'import "' + mainUrl + '" as userMain;';
|
| + var firstArg = urls.length == 0 ? '[]' :
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| + ('[\n "' + urls.join('",\n "') + '"\n ]');
|
| + return (imports.join('\n') +
|
| + '\n\nmain() {\n' +
|
| + ' polymer.initPolymer(' + firstArg + ', userMain.main);\n' +
|
| + '}\n');
|
| + }
|
| +
|
| + // Finds all top-level <script> tags, and <script> tags in custom elements
|
| + // and merges them into a single entrypoint.
|
| + function mergeScripts() {
|
| + var scripts = document.getElementsByTagName("script");
|
| + var length = scripts.length;
|
| +
|
| + var dartScripts = []
|
| + var urls = [];
|
| +
|
| + // Collect the information we need to replace the script tags
|
| + for (var i = 0; i < length; ++i) {
|
| + var script = scripts[i];
|
| + if (script.type == "application/dart") {
|
| + dartScripts.push(script);
|
| + if (isTopLevel(script)) continue;
|
| + urls.push(getScriptUrl(script));
|
| + }
|
| + }
|
| +
|
| + // Removes all the original script tags under elements, and replace
|
| + // top-level script tags so we first call each element's _init.
|
| + for (var i = 0; i < dartScripts.length; ++i) {
|
| + var script = dartScripts[i];
|
| + if (isTopLevel(script)) {
|
| + var newScript = document.createElement('script');
|
| + newScript.type = "application/dart";
|
| + newScript.textContent = createMain(urls, getScriptUrl(script));
|
| + script.parentNode.replaceChild(newScript, script);
|
| + } else {
|
| + script.parentNode.removeChild(script);
|
| + }
|
| + }
|
| + }
|
| +
|
| + var alreadyRan = false;
|
| + window.addEventListener('HTMLImportsLoaded', function (e) {
|
| + if (alreadyRan) {
|
| + console.warn('HTMLImportsLoaded fired again.');
|
| + return;
|
| + }
|
| + alreadyRan = true;
|
| + var ref = document.body.children[0];
|
| + inlinePolymerElements(document, ref);
|
| + mergeScripts();
|
| + if (!navigator.webkitStartDart()) {
|
| + document.body.innerHTML = 'This build has expired. Please download a ' +
|
| + 'new Dartium at http://www.dartlang.org/dartium/index.html';
|
| + }
|
| + });
|
| +})();
|
|
|
Chromium Code Reviews
Issue 23224003:
move polymer.dart into dart svn (Closed)
Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart