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