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| 1 // Copyright (c) 2015, 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 source.sdk_ext; | |
| 6 | |
| 7 import 'dart:convert'; | |
| 8 import 'dart:core' hide Resource; | |
| 9 | |
| 10 import 'package:analyzer/file_system/file_system.dart'; | |
| 11 import 'package:analyzer/src/generated/java_io.dart' show JavaFile; | |
| 12 import 'package:analyzer/src/generated/source.dart'; | |
| 13 import 'package:analyzer/src/generated/source_io.dart' show FileBasedSource; | |
| 14 import 'package:path/path.dart' as pathos; | |
| 15 | |
| 16 /// Given a packageMap (see [PackageMapProvider]), check in each package's lib | |
| 17 /// directory for the existence of a `_sdkext` file. This file must contain a | |
| 18 /// JSON encoded map. Each key in the map is a `dart:` library name. Each value | |
| 19 /// is a path (relative to the directory containing `_sdkext`) to a dart script | |
| 20 /// for the given library. For example: | |
| 21 /// { | |
| 22 /// "dart:sky": "../sdk_ext/dart_sky.dart" | |
| 23 /// } | |
| 24 /// | |
| 25 /// If a key doesn't begin with `dart:` it is ignored. | |
| 26 class SdkExtUriResolver extends UriResolver { | |
| 27 static const String SDK_EXT_NAME = '_sdkext'; | |
| 28 static const String DART_COLON_PREFIX = 'dart:'; | |
| 29 | |
| 30 final Map<String, String> _urlMappings = <String,String>{}; | |
| 31 | |
| 32 /// Construct a [SdkExtUriResolver] from a package map | |
| 33 /// (see [PackageMapProvider]). | |
| 34 SdkExtUriResolver(Map<String, List<Folder>> packageMap) { | |
| 35 if (packageMap == null) { | |
| 36 return; | |
| 37 } | |
| 38 packageMap.forEach(_processPackage); | |
| 39 } | |
| 40 | |
| 41 /// Number of sdk extensions. | |
| 42 int get length => _urlMappings.length; | |
| 43 | |
| 44 /// Return the path mapping for [libName] or null if there is none. | |
| 45 String operator[](String libName) => _urlMappings[libName]; | |
| 46 | |
| 47 /// Programmatically add a new SDK extension given a JSON description | |
| 48 /// ([sdkExtJSON]) and a lib directory ([libDir]). | |
| 49 void addSdkExt(String sdkExtJSON, Folder libDir) { | |
| 50 _processSdkExt(sdkExtJSON, libDir); | |
| 51 } | |
| 52 | |
| 53 @override | |
| 54 Source resolveAbsolute(Uri importUri) { | |
| 55 String libraryName = _libraryName(importUri); | |
| 56 String partPath = _partPath(importUri); | |
| 57 // Lookup library name in mappings. | |
| 58 String mapping = _urlMappings[libraryName]; | |
| 59 if (mapping == null) { | |
| 60 // Not found. | |
| 61 return null; | |
| 62 } | |
| 63 // This mapping points to the main entry file of the sdk extension. | |
| 64 Uri libraryEntry = new Uri.file(mapping); | |
| 65 if (!libraryEntry.isAbsolute) { | |
| 66 // We expect an absolute path. | |
| 67 return null; | |
| 68 } | |
| 69 | |
| 70 if (partPath != null) { | |
| 71 return _resolvePart(libraryEntry, partPath, importUri); | |
| 72 } else { | |
| 73 return _resolveEntry(libraryEntry, importUri); | |
| 74 } | |
| 75 } | |
| 76 | |
| 77 @override | |
| 78 Uri restoreAbsolute(Source source) { | |
| 79 String libraryName = _libraryName(source.uri); | |
| 80 if (_registeredSdkExtension(libraryName)) { | |
| 81 return source.uri; | |
| 82 } | |
| 83 return null; | |
| 84 } | |
| 85 | |
| 86 /// Return the library name of [importUri]. | |
| 87 String _libraryName(Uri importUri) { | |
| 88 var uri = importUri.toString(); | |
| 89 int index = uri.indexOf('/'); | |
| 90 if (index >= 0) { | |
| 91 return uri.substring(0, index); | |
| 92 } | |
| 93 return uri; | |
| 94 } | |
| 95 | |
| 96 /// Return the part path of [importUri]. | |
| 97 String _partPath(Uri importUri) { | |
| 98 var uri = importUri.toString(); | |
| 99 int index = uri.indexOf('/'); | |
| 100 if (index >= 0) { | |
| 101 return uri.substring(index + 1); | |
| 102 } | |
| 103 return null; | |
| 104 } | |
| 105 | |
| 106 /// Given a package [name] and a list of folders ([libDirs]), | |
| 107 /// add any found sdk extensions. | |
| 108 void _processPackage(String name, List<Folder> libDirs) { | |
| 109 for (var libDir in libDirs) { | |
| 110 var sdkExt = _readDotSdkExt(libDir); | |
| 111 if (sdkExt != null) { | |
| 112 _processSdkExt(sdkExt, libDir); | |
| 113 } | |
| 114 } | |
| 115 } | |
| 116 | |
| 117 /// Given the JSON for an SDK extension ([sdkExtJSON]) and a folder | |
| 118 /// ([libDir]), setup the uri mapping. | |
| 119 void _processSdkExt(String sdkExtJSON, Folder libDir) { | |
| 120 var sdkExt; | |
| 121 try { | |
| 122 sdkExt = JSON.decode(sdkExtJSON); | |
| 123 } catch (e) { | |
| 124 return; | |
| 125 } | |
| 126 if ((sdkExt == null) || (sdkExt is! Map)) { | |
| 127 return; | |
| 128 } | |
| 129 sdkExt.forEach((k, v) => _processSdkExtension(k, v, libDir)); | |
| 130 } | |
| 131 | |
| 132 /// Install the mapping from [name] to [libDir]/[file]. | |
| 133 void _processSdkExtension(String name, String file, Folder libDir) { | |
| 134 if (!name.startsWith(DART_COLON_PREFIX)) { | |
| 135 // SDK extensions must begin with 'dart:'. | |
| 136 return; | |
| 137 } | |
| 138 var key = name; | |
| 139 var value = libDir.canonicalizePath(file); | |
| 140 _urlMappings[key] = value; | |
| 141 } | |
| 142 | |
| 143 /// Read the contents of [libDir]/[SDK_EXT_NAME] as a string. | |
| 144 /// Returns null if the file doesn't exist. | |
| 145 String _readDotSdkExt(Folder libDir) { | |
| 146 var file = libDir.getChild(SDK_EXT_NAME); | |
| 147 try { | |
| 148 return file.readAsStringSync(); | |
| 149 } on FileSystemException { | |
| 150 // File can't be read. | |
| 151 return null; | |
| 152 } | |
| 153 } | |
| 154 | |
| 155 /// Returns true if [libraryName] is a registered sdk extension. | |
| 156 bool _registeredSdkExtension(String libraryName) { | |
| 157 return _urlMappings[libraryName] != null; | |
| 158 } | |
| 159 | |
| 160 /// Resolve an import of an sdk extension. | |
| 161 Source _resolveEntry(Uri libraryEntry, Uri importUri) { | |
| 162 // Library entry. | |
| 163 JavaFile javaFile = new JavaFile.fromUri(libraryEntry); | |
| 164 return new FileBasedSource(javaFile, importUri); | |
| 165 } | |
| 166 | |
| 167 /// Resolve a 'part' statement inside an sdk extension. | |
| 168 Source _resolvePart(Uri libraryEntry, String partPath, Uri importUri) { | |
| 169 // Library part. | |
| 170 var directory = pathos.dirname(libraryEntry.path); | |
| 171 var partUri = new Uri.file(pathos.join(directory, partPath)); | |
| 172 assert(partUri.isAbsolute); | |
| 173 JavaFile javaFile = new JavaFile.fromUri(partUri); | |
| 174 return new FileBasedSource(javaFile, importUri); | |
| 175 } | |
| 176 } | |
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Chromium Code Reviews
Issue 1400473008:
Roll Observatory packages and add a roll script (Closed)
Base URL: git@github.com:dart-lang/observatory_pub_packages.git@master