Fasta builders.

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

Index: pkg/fasta/lib/src/builder/constructor_reference_builder.dart
diff --git a/pkg/fasta/lib/src/builder/constructor_reference_builder.dart b/pkg/fasta/lib/src/builder/constructor_reference_builder.dart
new file mode 100644
index 0000000000000000000000000000000000000000..21f5e3ba3ff2031bad80e4546feaa6dcc7d23a96
--- /dev/null
+++ b/pkg/fasta/lib/src/builder/constructor_reference_builder.dart
@@ -0,0 +1,58 @@
+// 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.constructor_reference_builder;
+
+import 'builder.dart' show
+    PrefixBuilder,
+    ClassBuilder,
+    Builder,
+    TypeBuilder;
+
+import 'scope.dart' show
+    Scope;
+
+class ConstructorReferenceBuilder extends Builder {
+  final String name;
+
+  final List<TypeBuilder> typeArguments;
+
+  /// This is the name of a named constructor. As `bar` in `new Foo<T>.bar()`.
+  final String suffix;
+
+  Builder target;
+
+  ConstructorReferenceBuilder(this.name, this.typeArguments, this.suffix);
+
+  String get fullNameForErrors => "$name${suffix == null ? '' : '.$suffix'}";
+
+  void resolveIn(Scope scope) {
+    int index = name.indexOf(".");
+    Builder builder;
+    if (index == -1) {
+      builder = scope.lookup(name);
+    } else {
+      String prefix = name.substring(0, index);
+      String middle = name.substring(index + 1);
+      builder = scope.lookup(prefix);
+      if (builder is PrefixBuilder) {
+        PrefixBuilder prefix = builder;
+        builder = prefix.exports[middle];
+      } else if (builder is ClassBuilder) {
+        ClassBuilder cls = builder;
+        builder = cls.constructors[middle];
+        if (suffix == null) {
+          target = builder;
+          return;
+        }
+      }
+    }
+    if (builder is ClassBuilder) {
+      target = builder.constructors[suffix ?? ""];
+    }
+    if (target == null) {
+      print("Couldn't find constructor $fullNameForErrors.");
+    }
+  }
+}