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Side by Side Diff: pkg/compiler/lib/src/util/uri_extras.dart

Issue 693183006: Revert "Move dart2js from sdk/lib/_internal/compiler to pkg/compiler" (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart
Patch Set: Created 6 years, 1 month ago
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1 // Copyright (c) 2012, 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 library uri_extras;
6
7 import 'dart:math';
8
9 String relativize(Uri base, Uri uri, bool isWindows) {
10 if (!base.path.startsWith('/')) {
11 // Also throw an exception if [base] or base.path is null.
12 throw new ArgumentError('Expected absolute path: ${base.path}');
13 }
14 if (!uri.path.startsWith('/')) {
15 // Also throw an exception if [uri] or uri.path is null.
16 throw new ArgumentError('Expected absolute path: ${uri.path}');
17 }
18 bool equalsNCS(String a, String b) {
19 return a.toLowerCase() == b.toLowerCase();
20 }
21
22 String normalize(String path) {
23 if (isWindows) {
24 return path.toLowerCase();
25 } else {
26 return path;
27 }
28 }
29
30 if (equalsNCS(base.scheme, 'file') &&
31 equalsNCS(base.scheme, uri.scheme) &&
32 base.userInfo == uri.userInfo &&
33 equalsNCS(base.host, uri.host) &&
34 base.port == uri.port &&
35 uri.query == "" && uri.fragment == "") {
36 if (normalize(uri.path).startsWith(normalize(base.path))) {
37 return uri.path.substring(base.path.lastIndexOf('/') + 1);
38 }
39
40 List<String> uriParts = uri.path.split('/');
41 List<String> baseParts = base.path.split('/');
42 int common = 0;
43 int length = min(uriParts.length, baseParts.length);
44 while (common < length &&
45 normalize(uriParts[common]) == normalize(baseParts[common])) {
46 common++;
47 }
48 if (common == 1 || (isWindows && common == 2)) {
49 // The first part will always be an empty string because the
50 // paths are absolute. On Windows, we must also consider drive
51 // letters or hostnames.
52 if (baseParts.length > common + 1) {
53 // Avoid using '..' to go to the root, unless we are already there.
54 return uri.path;
55 }
56 }
57 StringBuffer sb = new StringBuffer();
58 for (int i = common + 1; i < baseParts.length; i++) {
59 sb.write('../');
60 }
61 for (int i = common; i < uriParts.length - 1; i++) {
62 sb.write('${uriParts[i]}/');
63 }
64 sb.write('${uriParts.last}');
65 return sb.toString();
66 }
67 return uri.toString();
68 }
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