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1 // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 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. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 library analyzer.source.package_map_resolver; | 5 library analyzer.source.package_map_resolver; |
6 | 6 |
7 import 'dart:core'; | 7 import 'dart:core'; |
8 | 8 |
9 import 'package:analyzer/file_system/file_system.dart'; | 9 import 'package:analyzer/file_system/file_system.dart'; |
10 import 'package:analyzer/src/generated/source.dart'; | 10 import 'package:analyzer/src/generated/source.dart'; |
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34 | 34 |
35 /** | 35 /** |
36 * Create a new [PackageMapUriResolver]. | 36 * Create a new [PackageMapUriResolver]. |
37 * | 37 * |
38 * [packageMap] is a table mapping package names to the paths of the | 38 * [packageMap] is a table mapping package names to the paths of the |
39 * directories containing the package | 39 * directories containing the package |
40 */ | 40 */ |
41 PackageMapUriResolver(this.resourceProvider, this.packageMap) { | 41 PackageMapUriResolver(this.resourceProvider, this.packageMap) { |
42 asserts.notNull(resourceProvider); | 42 asserts.notNull(resourceProvider); |
43 asserts.notNull(packageMap); | 43 asserts.notNull(packageMap); |
| 44 packageMap.forEach((name, folders) { |
| 45 if (folders.length != 1) { |
| 46 throw new ArgumentError( |
| 47 'Exactly one folder must be specified for a package.' |
| 48 'Found $name = $folders'); |
| 49 } |
| 50 }); |
44 } | 51 } |
45 | 52 |
46 @override | 53 @override |
47 Source resolveAbsolute(Uri uri, [Uri actualUri]) { | 54 Source resolveAbsolute(Uri uri, [Uri actualUri]) { |
48 if (!isPackageUri(uri)) { | 55 if (!isPackageUri(uri)) { |
49 return null; | 56 return null; |
50 } | 57 } |
51 // Prepare path. | 58 // Prepare path. |
52 String path = uri.path; | 59 String path = uri.path; |
53 // Prepare path components. | 60 // Prepare path components. |
54 int index = path.indexOf('/'); | 61 int index = path.indexOf('/'); |
55 if (index == -1 || index == 0) { | 62 if (index == -1 || index == 0) { |
56 return null; | 63 return null; |
57 } | 64 } |
58 // <pkgName>/<relPath> | 65 // <pkgName>/<relPath> |
59 String pkgName = path.substring(0, index); | 66 String pkgName = path.substring(0, index); |
60 String relPath = path.substring(index + 1); | 67 String relPath = path.substring(index + 1); |
61 // Try to find an existing file. | 68 // If the package is known, return the corresponding file. |
62 List<Folder> packageDirs = packageMap[pkgName]; | 69 List<Folder> packageDirs = packageMap[pkgName]; |
63 if (packageDirs != null) { | 70 if (packageDirs != null) { |
64 for (Folder packageDir in packageDirs) { | 71 Folder packageDir = packageDirs.single; |
65 if (packageDir.exists) { | 72 File file = packageDir.getChildAssumingFile(relPath); |
66 Resource result = packageDir.getChild(relPath); | 73 return file.createSource(uri); |
67 if (result is File && result.exists) { | |
68 return result.createSource(uri); | |
69 } | |
70 } | |
71 } | |
72 } | 74 } |
73 // Return a NonExistingSource instance. | 75 return null; |
74 // This helps provide more meaningful error messages to users | |
75 // (a missing file error, as opposed to an invalid URI error). | |
76 String fullPath = packageDirs != null && packageDirs.isNotEmpty | |
77 ? packageDirs.first.canonicalizePath(relPath) | |
78 : relPath; | |
79 return new NonExistingSource(fullPath, uri, UriKind.PACKAGE_URI); | |
80 } | 76 } |
81 | 77 |
82 @override | 78 @override |
83 Uri restoreAbsolute(Source source) { | 79 Uri restoreAbsolute(Source source) { |
84 String sourcePath = source.fullName; | 80 String sourcePath = source.fullName; |
85 Uri bestMatch; | |
86 int bestMatchLength = -1; | |
87 pathos.Context pathContext = resourceProvider.pathContext; | 81 pathos.Context pathContext = resourceProvider.pathContext; |
88 for (String pkgName in packageMap.keys) { | 82 for (String pkgName in packageMap.keys) { |
89 List<Folder> pkgFolders = packageMap[pkgName]; | 83 Folder pkgFolder = packageMap[pkgName][0]; |
90 for (int i = 0; i < pkgFolders.length; i++) { | 84 String pkgFolderPath = pkgFolder.path; |
91 Folder pkgFolder = pkgFolders[i]; | 85 if (sourcePath.startsWith(pkgFolderPath + pathContext.separator)) { |
92 String pkgFolderPath = pkgFolder.path; | 86 String relPath = sourcePath.substring(pkgFolderPath.length + 1); |
93 if (pkgFolderPath.length > bestMatchLength && | 87 List<String> relPathComponents = pathContext.split(relPath); |
94 sourcePath.startsWith(pkgFolderPath + pathContext.separator)) { | 88 String relUriPath = pathos.posix.joinAll(relPathComponents); |
95 String relPath = sourcePath.substring(pkgFolderPath.length + 1); | 89 return Uri.parse('$PACKAGE_SCHEME:$pkgName/$relUriPath'); |
96 if (_isReversibleTranslation(pkgFolders, i, relPath)) { | |
97 List<String> relPathComponents = pathContext.split(relPath); | |
98 String relUriPath = pathos.posix.joinAll(relPathComponents); | |
99 bestMatch = Uri.parse('$PACKAGE_SCHEME:$pkgName/$relUriPath'); | |
100 bestMatchLength = pkgFolderPath.length; | |
101 } | |
102 } | |
103 } | 90 } |
104 } | 91 } |
105 return bestMatch; | 92 return null; |
106 } | 93 } |
107 | 94 |
108 /** | 95 /** |
109 * A translation from file path to package URI has just been found for | |
110 * using the [packageDirIndex]th element of [packageDirs], and appending the | |
111 * relative path [relPath]. Determine whether the translation is reversible; | |
112 * that is, whether translating the package URI pack to a file path will | |
113 * produce the file path we started with. | |
114 */ | |
115 bool _isReversibleTranslation( | |
116 List<Folder> packageDirs, int packageDirIndex, String relPath) { | |
117 // The translation is reversible provided there is no prior element of | |
118 // [packageDirs] containing a file matching [relPath]. | |
119 for (int i = 0; i < packageDirIndex; i++) { | |
120 Folder packageDir = packageDirs[i]; | |
121 if (packageDir.exists) { | |
122 Resource result = packageDir.getChild(relPath); | |
123 if (result is File && result.exists) { | |
124 return false; | |
125 } | |
126 } | |
127 } | |
128 return true; | |
129 } | |
130 | |
131 /** | |
132 * Returns `true` if [uri] is a `package` URI. | 96 * Returns `true` if [uri] is a `package` URI. |
133 */ | 97 */ |
134 static bool isPackageUri(Uri uri) { | 98 static bool isPackageUri(Uri uri) { |
135 return uri.scheme == PACKAGE_SCHEME; | 99 return uri.scheme == PACKAGE_SCHEME; |
136 } | 100 } |
137 } | 101 } |
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