Removed fixed dependencies

packages/analyzer/lib/source/config.dart

+// Copyright (c) 2016, 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.
+
+import 'package:analyzer/file_system/file_system.dart';
+import 'package:analyzer/source/analysis_options_provider.dart';
+import 'package:analyzer/src/generated/engine.dart';
+import 'package:analyzer/src/task/model.dart';
+import 'package:analyzer/task/model.dart';
+import 'package:package_config/packages.dart';
+import 'package:yaml/src/yaml_node.dart';
+import 'package:yaml/yaml.dart';
+
+/// The descriptor used to associate analysis configuration with analysis
+/// contexts in configuration data.
+final ResultDescriptor<AnalysisConfiguration> ANALYSIS_CONFIGURATION =
+    new ResultDescriptorImpl('analysis.config', null);
+
+/// Return configuration associated with this [context], or `null` if there is
+/// none.
+AnalysisConfiguration getConfiguration(AnalysisContext context) =>
+    context.getConfigurationData(ANALYSIS_CONFIGURATION);
+
+/// Associate this [config] with the given [context].
+void setConfiguration(AnalysisContext context, AnalysisConfiguration config) {
+  context.setConfigurationData(ANALYSIS_CONFIGURATION, config);
+}
+
+/// Analysis configuration.
+abstract class AnalysisConfiguration {
+  final AnalysisOptionsProvider optionsProvider = new AnalysisOptionsProvider();
+  final Packages packages;
+  final ResourceProvider resourceProvider;
+  AnalysisConfiguration(this.resourceProvider, this.packages);
+
+  factory AnalysisConfiguration.fromPubspec(
+          File pubspec, ResourceProvider resourceProvider, Packages packages) =>
+      new PubspecConfiguration(pubspec, resourceProvider, packages);
+
+  /// Get a map of options defined by this configuration (or `null` if none
+  /// are specified).
+  Map get options;
+}
+
+/// Describes an analysis configuration.
+class AnalysisConfigurationDescriptor {
+  /// The name of the package hosting the configuration.
+  String package;
+
+  /// The name of the configuration "pragma".
+  String pragma;
+
+  AnalysisConfigurationDescriptor.fromAnalyzerOptions(Map analyzerOptions) {
+    Object config = analyzerOptions['configuration'];
+    if (config is String) {
+      List<String> items = config.split('/');
+      if (items.length == 2) {
+        package = items[0].trim();
+        pragma = items[1].trim();
+      }
+    }
+  }
+
+  /// Return true if this descriptor is valid.
+  bool get isValid => package != null && pragma != null;
+}
+
+/// Pubspec-specified analysis configuration.
+class PubspecConfiguration extends AnalysisConfiguration {
+  final File pubspec;
+  PubspecConfiguration(
+      this.pubspec, ResourceProvider resourceProvider, Packages packages)
+      : super(resourceProvider, packages);
+
+  @override
+  Map get options {
+    //Safest not to cache (requested infrequently).
+    if (pubspec.exists) {
+      try {
+        String contents = pubspec.readAsStringSync();
+        YamlNode map = loadYamlNode(contents);
+        if (map is YamlMap) {
+          YamlNode config = map['analyzer'];
+          if (config is YamlMap) {
+            AnalysisConfigurationDescriptor descriptor =
+                new AnalysisConfigurationDescriptor.fromAnalyzerOptions(config);
+
+            if (descriptor.isValid) {
+              //Create a path, given descriptor and packagemap
+              Uri uri = packages.asMap()[descriptor.package];
+              Uri pragma = new Uri.file('config/${descriptor.pragma}.yaml',
+                  windows: false);
+              Uri optionsUri = uri.resolveUri(pragma);
+              String path = resourceProvider.pathContext.fromUri(optionsUri);
+              File file = resourceProvider.getFile(path);
+              if (file.exists) {
+                return optionsProvider.getOptionsFromFile(file);
+              }
+            }
+          }
+        }
+      } catch (_) {
+        // Skip exceptional configurations.
+      }
+    }
+    return null;
+  }
+}