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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 /// Builds an index.html file in each folder containing entry points, if none | |
6 /// already exists. This file simply lists all the entry point files. | |
7 library polymer.src.build.index_page_builder; | |
8 | |
9 import 'dart:async'; | |
10 import 'dart:math'; | |
11 | |
12 import 'package:barback/barback.dart'; | |
13 import 'package:path/path.dart' as path; | |
14 | |
15 import 'common.dart'; | |
16 | |
17 /// Builds an index.html file in each folder containing entry points, if none | |
18 /// already exists. This file simply lists all the entry point files. | |
19 class IndexPageBuilder extends AggregateTransformer { | |
20 final TransformOptions options; | |
21 | |
22 IndexPageBuilder(this.options); | |
23 | |
24 classifyPrimary(AssetId id) { | |
25 if (!options.isHtmlEntryPoint(id)) return null; | |
26 // Group all entry points together. | |
27 return 'all_entry_points'; | |
28 } | |
29 | |
30 Future apply(AggregateTransform transform) { | |
31 Map<String, List<String>> dirFilesMap = {}; | |
32 | |
33 return transform.primaryInputs.toList().then((assets) { | |
34 // Add the asset to its directory, and make sure its directory is included | |
35 // in all its parents. | |
36 for (var asset in assets) { | |
37 var dir = path.url.dirname(asset.id.path); | |
38 while (dir != '.') { | |
39 dirFilesMap.putIfAbsent(dir, () => []); | |
40 | |
41 var relativePath = path.url.relative(asset.id.path, from: dir); | |
42 var relativeDir = path.url.dirname(relativePath); | |
43 dirFilesMap[dir].add(relativePath); | |
44 dir = path.url.dirname(dir); | |
45 } | |
46 } | |
47 | |
48 // Create an output index.html file for each directory, if one doesn't | |
49 // exist already | |
50 var futures = []; | |
51 dirFilesMap.forEach((directory, files) { | |
52 futures.add(_createOutput(directory, files, transform)); | |
53 }); | |
54 return Future.wait(futures); | |
55 }); | |
56 } | |
57 | |
58 Future _createOutput( | |
59 String directory, List<String> files, AggregateTransform transform) { | |
60 var indexAsset = | |
61 new AssetId(transform.package, path.url.join(directory, 'index.html')); | |
62 | |
63 return transform.hasInput(indexAsset).then((exists) { | |
64 // Don't overwrite existing outputs! | |
65 if (exists) return; | |
66 | |
67 // Sort alphabetically by recursive path parts. | |
68 files.sort((String a, String b) { | |
69 var aParts = path.url.split(a); | |
70 var bParts = path.url.split(b); | |
71 int diff = 0; | |
72 int minLength = min(aParts.length, bParts.length); | |
73 for (int i = 0; i < minLength; i++) { | |
74 // Directories are sorted below files. | |
75 var aIsDir = i < aParts.length - 1; | |
76 var bIsDir = i < bParts.length - 1; | |
77 if (aIsDir && !bIsDir) return 1; | |
78 if (!aIsDir && bIsDir) return -1; | |
79 | |
80 // Raw string comparison, if not identical we return. | |
81 diff = aParts[i].compareTo(bParts[i]); | |
82 if (diff != 0) return diff; | |
83 } | |
84 // Identical files, shouldn't happen in practice. | |
85 return 0; | |
86 }); | |
87 | |
88 // Create the document with a list. | |
89 var doc = new StringBuffer( | |
90 '<!DOCTYPE html><html><body><h1>Entry points</h1><ul>'); | |
91 | |
92 // Add all the assets to the list. | |
93 for (var file in files) { | |
94 doc.write('<li><a href="$file">$file</a></li>'); | |
95 } | |
96 | |
97 doc.write('</ul></body></html>'); | |
98 | |
99 // Output the index.html file | |
100 transform.addOutput(new Asset.fromString(indexAsset, doc.toString())); | |
101 }); | |
102 } | |
103 } | |
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