Make SDK contexts visible on status page

pkg/analyzer/lib/src/generated/sdk.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 analyzer.src.generated.sdk;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
 import 'package:analyzer/src/generated/engine.dart'
-    show AnalysisContext, AnalysisOptions;
+    show AnalysisContext, AnalysisOptions, AnalysisOptionsImpl;
 import 'package:analyzer/src/generated/source.dart' show Source;
 import 'package:analyzer/src/generated/utilities_general.dart';
 
 /**
  * A function used to create a new DartSdk with the given [options]. If the
  * passed [options] are `null`, then default options are used.
  */
 typedef DartSdk SdkCreator(AnalysisOptions options);
 
 /**
@@ skipping 106 matching lines @@
    * created.
    */
   DartSdk get anySdk {
     if (sdkMap.isEmpty) {
       return null;
     }
     return sdkMap.values.first;
   }
 
   /**
+   * Return a list of the descriptors of the SDKs that are currently being
+   * managed.
+   */
+  List<SdkDescription> get sdkDescriptors => sdkMap.keys.toList();
+
+  /**
    * Return the Dart SDK that is appropriate for the given analysis [options].
    * If such an SDK has not yet been created, then the [sdkCreator] will be
    * invoked to create it.
    */
   DartSdk getSdk(SdkDescription description, DartSdk ifAbsent()) {
     return sdkMap.putIfAbsent(description, ifAbsent);
   }
 
   /**
    * Return the Dart SDK that is appropriate for the given analysis [options].
@@ skipping 91 matching lines @@
       }
       for (int i = 0; i < length; i++) {
         if (other.paths[i] != paths[i]) {
           return false;
         }
       }
       return true;
     }
     return false;
   }
+
+  @override
+  String toString() {
+    StringBuffer buffer = new StringBuffer();
+    bool needsSeparator = false;
+    void add(String optionName) {
+      if (needsSeparator) {
+        buffer.write(', ');
+      }
+      buffer.write(optionName);
+      needsSeparator = true;
+    }
+    for (String path in paths) {
+      add(path);
+    }
+    if (needsSeparator) {
+      buffer.write(' ');
+    }
+    buffer.write('(');
+    buffer.write(AnalysisOptionsImpl
+        .decodeCrossContextOptions(options.encodeCrossContextOptions()));
+    buffer.write(')');
+    return buffer.toString();
+  }
 }
 
 class SdkLibrariesReader_LibraryBuilder extends RecursiveAstVisitor<Object> {
   /**
    * The prefix added to the name of a library to form the URI used in code to
    * reference the library.
    */
   static String _LIBRARY_PREFIX = "dart:";
 
   /**
@@ skipping 259 matching lines @@
     _platforms |= DART2JS_PLATFORM;
   }
 
   /**
    * Record that this library can be run on the VM.
    */
   void setVmLibrary() {
     _platforms |= VM_PLATFORM;
   }
 }