Removed fixed dependencies

packages/analyzer/lib/src/context/source.dart

+// Copyright (c) 2015, 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 analyzer.src.context.source;
+
+import 'dart:collection';
+
+import 'package:analyzer/exception/exception.dart';
+import 'package:analyzer/file_system/file_system.dart';
+import 'package:analyzer/file_system/physical_file_system.dart';
+import 'package:analyzer/source/package_map_resolver.dart';
+import 'package:analyzer/src/generated/engine.dart';
+import 'package:analyzer/src/generated/sdk.dart';
+import 'package:analyzer/src/generated/source.dart';
+import 'package:analyzer/src/generated/utilities_dart.dart' as utils;
+import 'package:analyzer/src/util/fast_uri.dart';
+import 'package:package_config/packages.dart';
+
+/**
+ * Instances of the class `SourceFactory` resolve possibly relative URI's
+ * against an existing [Source].
+ */
+class SourceFactoryImpl implements SourceFactory {
+  @override
+  AnalysisContext context;
+
+  /**
+   * URI processor used to find mappings for `package:` URIs found in a
+   * `.packages` config file.
+   */
+  final Packages _packages;
+
+  /**
+   * Resource provider used in working with package maps.
+   */
+  final ResourceProvider _resourceProvider;
+
+  /**
+   * The resolvers used to resolve absolute URI's.
+   */
+  final List<UriResolver> resolvers;
+
+  /**
+   * The predicate to determine is [Source] is local.
+   */
+  LocalSourcePredicate _localSourcePredicate = LocalSourcePredicate.NOT_SDK;
+
+  /**
+   * Cache of mapping of absolute [Uri]s to [Source]s.
+   */
+  final HashMap<Uri, Source> _absoluteUriToSourceCache =
+      new HashMap<Uri, Source>();
+
+  /**
+   * Initialize a newly created source factory with the given absolute URI
+   * [resolvers] and optional [_packages] resolution helper.
+   */
+  SourceFactoryImpl(this.resolvers,
+      [this._packages, ResourceProvider resourceProvider])
+      : _resourceProvider =
+            resourceProvider ?? PhysicalResourceProvider.INSTANCE;
+
+  @override
+  DartSdk get dartSdk {
+    List<UriResolver> resolvers = this.resolvers;
+    int length = resolvers.length;
+    for (int i = 0; i < length; i++) {
+      UriResolver resolver = resolvers[i];
+      if (resolver is DartUriResolver) {
+        DartUriResolver dartUriResolver = resolver;
+        return dartUriResolver.dartSdk;
+      }
+    }
+    return null;
+  }
+
+  @override
+  void set localSourcePredicate(LocalSourcePredicate localSourcePredicate) {
+    this._localSourcePredicate = localSourcePredicate;
+  }
+
+  @override
+  Map<String, List<Folder>> get packageMap {
+    // Start by looking in .packages.
+    if (_packages != null) {
+      Map<String, List<Folder>> packageMap = <String, List<Folder>>{};
+      _packages.asMap().forEach((String name, Uri uri) {
+        if (uri.scheme == 'file' || uri.scheme == '' /* unspecified */) {
+          packageMap[name] = <Folder>[
+            _resourceProvider.getFolder(uri.toFilePath())
+          ];
+        }
+      });
+      return packageMap;
+    }
+
+    // Default to the PackageMapUriResolver.
+    PackageMapUriResolver resolver = resolvers
+        .firstWhere((r) => r is PackageMapUriResolver, orElse: () => null);
+    return resolver?.packageMap;
+  }
+
+  @override
+  SourceFactory clone() {
+    SourceFactory factory =
+        new SourceFactory(resolvers, _packages, _resourceProvider);
+    factory.localSourcePredicate = _localSourcePredicate;
+    return factory;
+  }
+
+  @override
+  Source forUri(String absoluteUri) {
+    try {
+      Uri uri = FastUri.parse(absoluteUri);
+      if (uri.isAbsolute) {
+        return _internalResolveUri(null, uri);
+      }
+    } catch (exception, stackTrace) {
+      AnalysisEngine.instance.logger.logError(
+          "Could not resolve URI: $absoluteUri",
+          new CaughtException(exception, stackTrace));
+    }
+    return null;
+  }
+
+  @override
+  Source forUri2(Uri absoluteUri) {
+    if (absoluteUri.isAbsolute) {
+      try {
+        return _internalResolveUri(null, absoluteUri);
+      } on AnalysisException catch (exception, stackTrace) {
+        AnalysisEngine.instance.logger.logError(
+            "Could not resolve URI: $absoluteUri",
+            new CaughtException(exception, stackTrace));
+      }
+    }
+    return null;
+  }
+
+  @override
+  Source fromEncoding(String encoding) {
+    Source source = forUri(encoding);
+    if (source == null) {
+      throw new ArgumentError("Invalid source encoding: '$encoding'");
+    }
+    return source;
+  }
+
+  @override
+  bool isLocalSource(Source source) => _localSourcePredicate.isLocal(source);
+
+  @override
+  Source resolveUri(Source containingSource, String containedUri) {
+    if (containedUri == null || containedUri.isEmpty) {
+      return null;
+    }
+    try {
+      // Force the creation of an escaped URI to deal with spaces, etc.
+      return _internalResolveUri(containingSource, FastUri.parse(containedUri));
+    } on FormatException {
+      return null;
+    } catch (exception, stackTrace) {
+      String containingFullName =
+          containingSource != null ? containingSource.fullName : '<null>';
+      AnalysisEngine.instance.logger.logInformation(
+          "Could not resolve URI ($containedUri) "
+          "relative to source ($containingFullName)",
+          new CaughtException(exception, stackTrace));
+      return null;
+    }
+  }
+
+  @override
+  Uri restoreUri(Source source) {
+    // First see if a resolver can restore the URI.
+    for (UriResolver resolver in resolvers) {
+      Uri uri = resolver.restoreAbsolute(source);
+      if (uri != null) {
+        // Now see if there's a package mapping.
+        Uri packageMappedUri = _getPackageMapping(uri);
+        if (packageMappedUri != null) {
+          return packageMappedUri;
+        }
+        // Fall back to the resolver's computed URI.
+        return uri;
+      }
+    }
+
+    return null;
+  }
+
+  Uri _getPackageMapping(Uri sourceUri) {
+    if (_packages == null) {
+      return null;
+    }
+    if (sourceUri.scheme != 'file') {
+      //TODO(pquitslund): verify this works for non-file URIs.
+      return null;
+    }
+
+    Uri packageUri;
+    _packages.asMap().forEach((String name, Uri uri) {
+      if (packageUri == null) {
+        if (utils.startsWith(sourceUri, uri)) {
+          packageUri = Uri.parse(
+              'package:$name/${sourceUri.path.substring(uri.path.length)}');
+        }
+      }
+    });
+    return packageUri;
+  }
+
+  /**
+   * Return a source object representing the URI that results from resolving
+   * the given (possibly relative) contained URI against the URI associated
+   * with an existing source object, or `null` if the URI could not be resolved.
+   *
+   * @param containingSource the source containing the given URI
+   * @param containedUri the (possibly relative) URI to be resolved against the
+   *        containing source
+   * @return the source representing the contained URI
+   * @throws AnalysisException if either the contained URI is invalid or if it
+   *         cannot be resolved against the source object's URI
+   */
+  Source _internalResolveUri(Source containingSource, Uri containedUri) {
+    if (!containedUri.isAbsolute) {
+      if (containingSource == null) {
+        throw new AnalysisException(
+            "Cannot resolve a relative URI without a containing source: "
+            "$containedUri");
+      }
+      containedUri =
+          utils.resolveRelativeUri(containingSource.uri, containedUri);
+    }
+
+    Uri actualUri = containedUri;
+
+    // Check .packages and update target and actual URIs as appropriate.
+    if (_packages != null && containedUri.scheme == 'package') {
+      Uri packageUri = null;
+      try {
+        packageUri =
+            _packages.resolve(containedUri, notFound: (Uri packageUri) => null);
+      } on ArgumentError {
+        // Fall through to try resolvers.
+      }
+
+      if (packageUri != null) {
+        // Ensure scheme is set.
+        if (packageUri.scheme == '') {
+          packageUri = packageUri.replace(scheme: 'file');
+        }
+        containedUri = packageUri;
+      }
+    }
+
+    return _absoluteUriToSourceCache.putIfAbsent(containedUri, () {
+      for (UriResolver resolver in resolvers) {
+        Source result = resolver.resolveAbsolute(containedUri, actualUri);
+        if (result != null) {
+          return result;
+        }
+      }
+      return null;
+    });
+  }
+}