Prototype API for accessing AST nodes.

dart/sdk/lib/_internal/compiler/implementation/mirrors/dart2js_mirrors.dart

Index: dart/sdk/lib/_internal/compiler/implementation/mirrors/dart2js_mirrors.dart
diff --git a/dart/sdk/lib/_internal/compiler/implementation/mirrors/dart2js_mirrors.dart b/dart/sdk/lib/_internal/compiler/implementation/mirrors/dart2js_mirrors.dart
index a4f88c2f31249cf227cd1a0d8a895d12189de20e..8ab65c65916f2578211332fe6decb7d2855a84ce 100644
--- a/dart/sdk/lib/_internal/compiler/implementation/mirrors/dart2js_mirrors.dart
+++ b/dart/sdk/lib/_internal/compiler/implementation/mirrors/dart2js_mirrors.dart
@@ -452,6 +452,19 @@ class Dart2JsCompilationUnitMirror extends Dart2JsMirror
   Uri get uri => _element.script.resourceUri;
 }
 
+class ResolvedNode {
+  final node;

[kevmoo, 2014/04/25 12:58:11]

Types here? Is nice...

[ahe, 2014/04/25 13:06:09]

I didn't want to add types as I didn't want to add another import. However, the
library that defines the type is already imported :-)

I should also add a comment that describes the purpose of this class.

+  final _elements;
+  final _mirrorSystem;
+  ResolvedNode(this.node, this._elements, this._mirrorSystem);
+
+  Mirror resolvedMirror(node) {
+    var element = _elements[node];
+    if (element == null) return null;
+    return _convertElementToDeclarationMirror(_mirrorSystem, element);
+  }
+}
+
 /**
  * Transitional class that allows access to features that have not yet
  * made it to the mirror API.
@@ -464,4 +477,32 @@ class BackDoor {
     return library._element.compilationUnits.toList().map(
         (cu) => new Dart2JsCompilationUnitMirror(cu, library)).toList();
   }
+
+  static Iterable metadataSyntaxOf(Dart2JsElementMirror declaration) {
+    Compiler compiler = declaration.mirrorSystem.compiler;
+    return declaration._element.metadata.toList().map((metadata) {
+      var node = metadata.parseNode(compiler);
+      Element annotatedElement = metadata.annotatedElement;
+      var context = annotatedElement.enclosingElement;
+      if (context == null) {
+        context = annotatedElement;
+      }
+      return new ResolvedNode(
+          node, context.treeElements, declaration.mirrorSystem);
+    });
+  }
+
+  static ResolvedNode initializerSyntaxOf(Dart2JsFieldMirror variable) {
+    var node = variable._variable.initializer;
+    if (node == null) return null;
+    return new ResolvedNode(
+        node, variable._variable.treeElements, variable.mirrorSystem);
+  }
+
+  static ResolvedNode defaultValueSyntaxOf(Dart2JsParameterMirror parameter) {
+    if (!parameter.hasDefaultValue) return null;
+    var node = parameter._element.initializer;
+    return new ResolvedNode(
+        node, parameter.owner._element.treeElements, parameter.mirrorSystem);
+  }
 }