Linter Demo

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Warnings: 3

File: /home/fstrocco/Dart/dart/benchmark/analyzer/lib/source/package_map_resolver.dart

// Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file // for details. All rights reserved. Use of this source code is governed by a // BSD-style license that can be found in the LICENSE file. library source.package_map_resolver; import 'package:analyzer/file_system/file_system.dart'; import 'package:analyzer/src/generated/source.dart'; import 'package:analyzer/src/util/asserts.dart' as asserts; /** * A [UriResolver] implementation for the `package:` scheme that uses a map of * package names to their directories. */ class PackageMapUriResolver extends UriResolver { /** * The name of the `package` scheme. */ static const String PACKAGE_SCHEME = "package"; /** * A table mapping package names to the path of the directories containing * the package. */ final Map<String, List<Folder>> packageMap; /** * The [ResourceProvider] for this resolver. */ final ResourceProvider resourceProvider; /** * Create a new [PackageMapUriResolver]. * * [packageMap] is a table mapping package names to the paths of the * directories containing the package */ PackageMapUriResolver(this.resourceProvider, this.packageMap) { asserts.notNull(resourceProvider); asserts.notNull(packageMap); } @override Source resolveAbsolute(Uri uri) { if (!isPackageUri(uri)) { return null; } // Prepare path. String path = uri.path; // Prepare path components. int index = path.indexOf('/'); if (index == -1 || index == 0) { return null; } // <pkgName>/<relPath> String pkgName = path.substring(0, index); String relPath = path.substring(index + 1); // Try to find an existing file. List<Folder> packageDirs = packageMap[pkgName]; if (packageDirs != null) { for (Folder packageDir in packageDirs) { if (packageDir.exists) { Resource result = packageDir.getChild(relPath); if (result is File && result.exists) { return result.createSource(uri); } } } } // Return a NonExistingSource instance. // This helps provide more meaningful error messages to users // (a missing file error, as opposed to an invalid URI error). return new NonExistingSource(uri.toString(), UriKind.PACKAGE_URI); } @override Uri restoreAbsolute(Source source) { String sourcePath = source.fullName; Uri bestMatch; int bestMatchLength = -1; for (String pkgName in packageMap.keys) { List<Folder> pkgFolders = packageMap[pkgName]; for (int i = 0; i < pkgFolders.length; i++) { Folder pkgFolder = pkgFolders[i]; String pkgFolderPath = pkgFolder.path; // TODO(paulberry): figure out the right thing to do for Windows. if (pkgFolderPath.length > bestMatchLength && sourcePath.startsWith(pkgFolderPath + '/')) { String relPath = sourcePath.substring(pkgFolderPath.length + 1); if (_isReversibleTranslation(pkgFolders, i, relPath)) { bestMatch = Uri.parse('$PACKAGE_SCHEME:$pkgName/$relPath'); bestMatchLength = pkgFolderPath.length; } } } } return bestMatch; } /** * A translation from file path to package URI has just been found for * using the [packageDirIndex]th element of [packageDirs], and appending the * relative path [relPath]. Determine whether the translation is reversible; * that is, whether translating the package URI pack to a file path will * produce the file path we started with. */ bool _isReversibleTranslation( List<Folder> packageDirs, int packageDirIndex, String relPath) { // The translation is reversible provided there is no prior element of // [packageDirs] containing a file matching [relPath]. for (int i = 0; i < packageDirIndex; i++) { Folder packageDir = packageDirs[i]; if (packageDir.exists) { Resource result = packageDir.getChild(relPath); if (result is File && result.exists) { return false; } } } return true; } /** * Returns `true` if [uri] is a `package` URI. */ static bool isPackageUri(Uri uri) { return uri.scheme == PACKAGE_SCHEME; } }