sigmund@google.com
a634d8ffc7
R=jmesserly@google.com Review URL: https://codereview.chromium.org//20414002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@25505 260f80e4-7a28-3924-810f-c04153c831b5
107 lines
3.0 KiB
JavaScript
107 lines
3.0 KiB
JavaScript
/*
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* Copyright 2013 The Polymer Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style
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* license that can be found in the LICENSE file.
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*/
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(function(scope) {
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var IMPORT_LINK_TYPE = 'import';
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// highlander object for parsing a document tree
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var importParser = {
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selectors: [
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'link[rel=' + IMPORT_LINK_TYPE + ']',
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'link[rel=stylesheet]',
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'style',
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'script:not([type])',
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'script[type="text/javascript"]'
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],
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map: {
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link: 'parseLink',
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script: 'parseScript',
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style: 'parseGeneric'
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},
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parse: function(inDocument) {
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if (!inDocument.__importParsed) {
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// only parse once
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inDocument.__importParsed = true;
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// all parsable elements in inDocument (depth-first pre-order traversal)
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var elts = inDocument.querySelectorAll(importParser.selectors);
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// for each parsable node type, call the mapped parsing method
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forEach(elts, function(e) {
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importParser[importParser.map[e.localName]](e);
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});
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}
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},
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parseLink: function(linkElt) {
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if (isDocumentLink(linkElt)) {
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if (linkElt.content) {
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importParser.parse(linkElt.content);
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}
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} else {
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this.parseGeneric(linkElt);
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}
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},
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parseGeneric: function(elt) {
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if (needsMainDocumentContext(elt)) {
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document.head.appendChild(elt);
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}
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},
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parseScript: function(scriptElt) {
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if (needsMainDocumentContext(scriptElt)) {
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// acquire code to execute
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var code = (scriptElt.__resource || scriptElt.textContent).trim();
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if (code) {
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// calculate source map hint
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var moniker = scriptElt.__nodeUrl;
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if (!moniker) {
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var moniker = scope.path.documentUrlFromNode(scriptElt);
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// there could be more than one script this url
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var tag = '[' + Math.floor((Math.random()+1)*1000) + ']';
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// TODO(sjmiles): Polymer hack, should be pluggable if we need to allow
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// this sort of thing
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var matches = code.match(/Polymer\(['"]([^'"]*)/);
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tag = matches && matches[1] || tag;
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// tag the moniker
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moniker += '/' + tag + '.js';
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}
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// source map hint
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code += "\n//# sourceURL=" + moniker + "\n";
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// evaluate the code
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eval.call(window, code);
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}
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}
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}
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};
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var forEach = Array.prototype.forEach.call.bind(Array.prototype.forEach);
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function isDocumentLink(elt) {
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return elt.localName === 'link'
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&& elt.getAttribute('rel') === IMPORT_LINK_TYPE;
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}
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function needsMainDocumentContext(node) {
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// nodes can be moved to the main document:
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// if they are in a tree but not in the main document and not children of <element>
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return node.parentNode && !inMainDocument(node)
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&& !isElementElementChild(node);
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}
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function inMainDocument(elt) {
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return elt.ownerDocument === document ||
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// TODO(sjmiles): ShadowDOMPolyfill intrusion
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elt.ownerDocument.impl === document;
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}
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function isElementElementChild(elt) {
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return elt.parentNode && elt.parentNode.localName === 'element';
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}
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// exports
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scope.parser = importParser;
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})(HTMLImports); |