Fasta builders.

pkg/fasta/lib/src/builder/metadata_builder.dart

Index: pkg/fasta/lib/src/builder/metadata_builder.dart
diff --git a/pkg/fasta/lib/src/builder/metadata_builder.dart b/pkg/fasta/lib/src/builder/metadata_builder.dart
new file mode 100644
index 0000000000000000000000000000000000000000..594c6f359611d65dcc951a2dfade0e79b685816b
--- /dev/null
+++ b/pkg/fasta/lib/src/builder/metadata_builder.dart
@@ -0,0 +1,48 @@
+// 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.
+
+library fasta.metadata_builder;
+
+import 'builder.dart' show
+    Builder,
+    TypeBuilder;
+
+import 'constructor_reference_builder.dart' show
+    ConstructorReferenceBuilder;
+
+abstract class MetadataBuilder<T extends TypeBuilder> extends Builder {
+  MetadataBuilder();
+
+  factory MetadataBuilder.fromConstructor(
+      ConstructorReferenceBuilder constructorReference, List arguments) {
+    return new ConstructorMetadataBuilder(constructorReference, arguments);
+  }
+
+  factory MetadataBuilder.fromExpression(String expression, String postfix) {
+    return new ExpressionMetadataBuilder(expression, postfix);
+  }
+}
+
+class ConstructorMetadataBuilder<T extends TypeBuilder>
+    extends MetadataBuilder<T> {
+  final ConstructorReferenceBuilder constructorReference;
+
+  final List arguments;
+
+  ConstructorMetadataBuilder(this.constructorReference, this.arguments);
+}
+
+/// Expression metadata (without arguments).
+///
+/// Matches this grammar rule:
+///
+///    '@' qualified (‘.’ identifier)?
+class ExpressionMetadataBuilder<T extends TypeBuilder>
+    extends MetadataBuilder<T> {
+  final String qualified;
+
+  final String identifier;
+
+  ExpressionMetadataBuilder(this.qualified, this.identifier);
+}