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1 /* | |
2 * Copyright 2013 The Polymer Authors. All rights reserved. | |
3 * Use of this source code is governed by a BSD-style | |
4 * license that can be found in the LICENSE file. | |
5 */ | |
6 | |
7 (function(scope) { | |
8 | |
9 var IMPORT_LINK_TYPE = 'import'; | |
10 | |
11 // highlander object for parsing a document tree | |
12 | |
13 var importParser = { | |
14 selectors: [ | |
15 'link[rel=' + IMPORT_LINK_TYPE + ']', | |
16 'link[rel=stylesheet]', | |
17 'style', | |
18 'script:not([type])', | |
19 'script[type="text/javascript"]' | |
20 ], | |
21 map: { | |
22 link: 'parseLink', | |
23 script: 'parseScript', | |
24 style: 'parseGeneric' | |
25 }, | |
26 parse: function(inDocument) { | |
27 if (!inDocument.__importParsed) { | |
28 // only parse once | |
29 inDocument.__importParsed = true; | |
30 // all parsable elements in inDocument (depth-first pre-order traversal) | |
31 var elts = inDocument.querySelectorAll(importParser.selectors); | |
32 // for each parsable node type, call the mapped parsing method | |
33 forEach(elts, function(e) { | |
34 importParser[importParser.map[e.localName]](e); | |
35 }); | |
36 } | |
37 }, | |
38 parseLink: function(linkElt) { | |
39 if (isDocumentLink(linkElt)) { | |
40 if (linkElt.content) { | |
41 importParser.parse(linkElt.content); | |
42 } | |
43 } else { | |
44 this.parseGeneric(linkElt); | |
45 } | |
46 }, | |
47 parseGeneric: function(elt) { | |
48 if (needsMainDocumentContext(elt)) { | |
49 document.head.appendChild(elt); | |
50 } | |
51 }, | |
52 parseScript: function(scriptElt) { | |
53 if (needsMainDocumentContext(scriptElt)) { | |
54 // acquire code to execute | |
55 var code = (scriptElt.__resource || scriptElt.textContent).trim(); | |
56 if (code) { | |
57 // calculate source map hint | |
58 var moniker = scriptElt.__nodeUrl; | |
59 if (!moniker) { | |
60 var moniker = scope.path.documentUrlFromNode(scriptElt); | |
61 // there could be more than one script this url | |
62 var tag = '[' + Math.floor((Math.random()+1)*1000) + ']'; | |
63 // TODO(sjmiles): Polymer hack, should be pluggable if we need to allo
w | |
64 // this sort of thing | |
65 var matches = code.match(/Polymer\(['"]([^'"]*)/); | |
66 tag = matches && matches[1] || tag; | |
67 // tag the moniker | |
68 moniker += '/' + tag + '.js'; | |
69 } | |
70 // source map hint | |
71 code += "\n//# sourceURL=" + moniker + "\n"; | |
72 // evaluate the code | |
73 eval.call(window, code); | |
74 } | |
75 } | |
76 } | |
77 }; | |
78 | |
79 var forEach = Array.prototype.forEach.call.bind(Array.prototype.forEach); | |
80 | |
81 function isDocumentLink(elt) { | |
82 return elt.localName === 'link' | |
83 && elt.getAttribute('rel') === IMPORT_LINK_TYPE; | |
84 } | |
85 | |
86 function needsMainDocumentContext(node) { | |
87 // nodes can be moved to the main document: | |
88 // if they are in a tree but not in the main document and not children of <ele
ment> | |
89 return node.parentNode && !inMainDocument(node) | |
90 && !isElementElementChild(node); | |
91 } | |
92 | |
93 function inMainDocument(elt) { | |
94 return elt.ownerDocument === document || | |
95 // TODO(sjmiles): ShadowDOMPolyfill intrusion | |
96 elt.ownerDocument.impl === document; | |
97 } | |
98 | |
99 function isElementElementChild(elt) { | |
100 return elt.parentNode && elt.parentNode.localName === 'element'; | |
101 } | |
102 | |
103 // exports | |
104 | |
105 scope.parser = importParser; | |
106 | |
107 })(HTMLImports); | |
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