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Side by Side Diff: pkg/polymer/lib/src/transform/import_inliner.dart

Issue 22935016: Introduce polymer transformers (inlined code extraction, inlining html imports, (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
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.
4
5 /** Transfomer that inlines polymer-element definitions from html imports. */
6 library polymer.src.transform.import_inliner;
7
8 import 'dart:async';
9
10 import 'package:barback/barback.dart';
11 import 'package:html5lib/dom.dart' show Document, Node, DocumentFragment;
12 import 'common.dart';
13
14 /** Recursively inlines polymer-element definitions from html imports. */
15 // TODO(sigmund): make sure we match semantics of html-imports for tags other
16 // than polymer-element (see dartbug.com/12613).
17 class ImportedElementInliner extends Transformer {
18 Future<bool> isPrimary(Asset input) =>
19 new Future.value(input.id.extension == ".html");
20
21 Future apply(Transform transform) {
22 var seen = new Set<AssetId>();
23 var elements = [];
24 var id = transform.primaryId;
25 seen.add(id);
26 return getPrimaryContent(transform).then((content) {
27 var document = parseHtml(content, id.path, transform.logger);
28 var future = _visitImports(document, id, transform, seen, elements);
29 return future.then((importsFound) {
30 if (!importsFound) {
31 transform.addOutput(new Asset.fromString(id, content));
32 return;
33 }
34
35 for (var tag in document.queryAll('link')) {
36 if (tag.attributes['rel'] == 'import') {
37 tag.remove();
38 }
39 }
40 var fragment = new DocumentFragment()..nodes.addAll(elements);
41 document.body.insertBefore(fragment,
42 //TODO(jmesserly): add Node.firstChild to html5lib
43 document.body.nodes.length == 0 ? null : document.body.nodes[0]);
44 transform.addOutput(new Asset.fromString(id, document.outerHtml));
45 });
46 });
47 }
48
49 /**
50 * Visits imports in [document] and add their polymer-element definitions to
51 * [elements], unless they have already been [seen]. Elements are added in the
52 * order they appear, transitive imports are added first.
53 */
54 Future<bool> _visitImports(Document document, AssetId sourceId,
55 Transform transform, Set<AssetId> seen, List<Node> elements) {
56 var importIds = [];
57 bool hasImports = false;
58 for (var tag in document.queryAll('link')) {
59 if (tag.attributes['rel'] != 'import') continue;
60 var href = tag.attributes['href'];
61 var id = resolve(sourceId, href, transform.logger, tag.sourceSpan);
62 hasImports = true;
63 if (id == null || seen.contains(id)) continue;
64 importIds.add(id);
65 }
66
67 if (importIds.isEmpty) return new Future.value(hasImports);
68
69 // Note: we need to preserve the import order in the generated output.
70 return Future.forEach(importIds, (id) {
71 if (seen.contains(id)) return new Future.value(null);
72 seen.add(id);
73 return _collectPolymerElements(id, transform, seen, elements);
74 }).then((_) => true);
75 }
76
77 /**
78 * Loads an asset identified by [id], visits its imports and collects it's
79 * polymer-element definitions.
80 */
81 Future _collectPolymerElements(
82 AssetId id, Transform transform, Set<AssetId> seen, List elements) {
83 return getContent(transform, id)
84 .then((content) => parseHtml(
85 content, id.path, transform.logger, checkDocType: false))
86 .then((document) {
87 return _visitImports(document, id, transform, seen, elements)
88 .then((_) => elements.addAll(document.queryAll('polymer-element')));
89 });
90 }
91 }
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