Rework Unparser/unparse StringBuffer management.

pkg/dartdoc/mirrors/dart2js_mirror.dart

 // Copyright (c) 2012, 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('mirrors.dart2js');
 
 #import('../../../lib/compiler/compiler.dart', prefix: 'diagnostics');
 #import('../../../lib/compiler/implementation/elements/elements.dart');
 #import('../../../lib/compiler/implementation/apiimpl.dart', prefix: 'api');
 #import('../../../lib/compiler/implementation/scanner/scannerlib.dart');
@@ skipping 592 matching lines @@
   String get qualifiedName() => '${_method.qualifiedName}#${simpleName}';
 
   TypeMirror get type() => _convertTypeToTypeMirror(system,
       _variableElement.computeType(system.compiler),
       system.compiler.types.dynamicType,
       _variableElement.variables.functionSignature);
 
   String get defaultValue() {
     if (hasDefaultValue) {
       SendSet expression = _variableElement.cachedNode.asSendSet();
-      return expression.arguments.head.unparse();
+      return unparse(expression.arguments.head);
     }
     return null;
   }
   bool get hasDefaultValue() {
     return _variableElement.cachedNode !== null &&
         _variableElement.cachedNode is SendSet;
   }
 
   bool get isInitializingFormal() => false;
 
@@ skipping 757 matching lines @@
     if (node !== null) {
       var span = system.compiler.spanFromNode(node, script.uri);
       return new Dart2JsLocation(script, span);
     } else {
       var span = system.compiler.spanFromElement(_variable);
       return new Dart2JsLocation(script, span);
     }
   }
 }