Allow Analysis Server crawl up the folders to search .analysis_options file.

pkg/analyzer/lib/source/analysis_options_provider.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.source.analysis_options_provider;
 
+import 'dart:core' hide Resource;
+
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/util/yaml.dart';
 import 'package:source_span/source_span.dart';
 import 'package:yaml/yaml.dart';
 
 /// Provide the options found in the `.analysis_options` file.
 class AnalysisOptionsProvider {
   /// Provide the options found in [root]/[ANALYSIS_OPTIONS_FILE].
   /// Return an empty options map if the file does not exist.
-  Map<String, YamlNode> getOptions(Folder root) {
-    var optionsSource = _readAnalysisOptionsFile(
-        root.getChild(AnalysisEngine.ANALYSIS_OPTIONS_FILE));
+  Map<String, YamlNode> getOptions(Folder root, {bool crawlUp: false}) {
+    Resource resource;
+    for (Folder folder = root; folder != null; folder = folder.parent) {
+      resource = folder.getChild(AnalysisEngine.ANALYSIS_OPTIONS_FILE);
+      if (resource.exists || !crawlUp) {
+        break;
+      }
+    }
+    var optionsSource = _readAnalysisOptionsFile(resource);

[Brian Wilkerson, 2016/03/23 22:16:57]

type?

     return getOptionsFromString(optionsSource);
   }
 
   /// Provide the options found in [file].
   /// Return an empty options map if the file does not exist.
   Map<String, YamlNode> getOptionsFromFile(File file) {
     var optionsSource = _readAnalysisOptionsFile(file);
     return getOptionsFromString(optionsSource);
   }
 
@@ skipping 78 matching lines @@
 /// Thrown on options format exceptions.
 class OptionsFormatException implements Exception {
   final String message;
   final SourceSpan span;
   OptionsFormatException(this.message, [this.span]);
 
   @override
   String toString() =>
       'OptionsFormatException: ${message?.toString()}, ${span?.toString()}';
 }