Fasta builders.

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

Index: pkg/fasta/lib/src/builder/interface_type_builder.dart
diff --git a/pkg/fasta/lib/src/builder/interface_type_builder.dart b/pkg/fasta/lib/src/builder/interface_type_builder.dart
new file mode 100644
index 0000000000000000000000000000000000000000..e0d0311590345ea9b937ea1f0e1ea2a5b91eb388
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+++ b/pkg/fasta/lib/src/builder/interface_type_builder.dart
@@ -0,0 +1,69 @@
+// 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.interface_type_builder;
+
+import 'scope.dart' show
+    Scope;
+
+import 'builder.dart' show
+    Builder,
+    InvalidTypeBuilder,
+    PrefixBuilder,
+    TypeBuilder,
+    TypeDeclarationBuilder;
+
+// TODO(ahe): This isn't really an interface type. Find better name. Possibly,
+// `NamedTypeBuilder`.
+abstract class InterfaceTypeBuilder<T extends TypeBuilder> extends TypeBuilder {
+  final String name;
+
+  final List<T> arguments;
+
+  TypeDeclarationBuilder get builder;
+
+  void set builder(TypeDeclarationBuilder b);
+
+  InterfaceTypeBuilder(this.name, this.arguments);
+
+  InvalidTypeBuilder buildInvalidType(String name);
+
+  void resolveIn(Scope scope) {
+    Builder member = scope.lookup(name);
+    if (member is TypeDeclarationBuilder) {
+      builder = member;
+      return;
+    }
+    if (name.contains(".")) {
+      int index = name.lastIndexOf(".");
+      String first = name.substring(0, index);
+      String last = name.substring(name.lastIndexOf(".") + 1);
+      var prefix = scope.lookup(first);
+      if (prefix is PrefixBuilder) {
+        member = prefix.exports[last];
+      }
+      if (member is TypeDeclarationBuilder) {
+        builder = member;
+        return;
+      }
+    }
+    builder = buildInvalidType(name);
+  }
+
+  String get debugName => "InterfaceTypeBuilder";
+
+  StringBuffer printOn(StringBuffer buffer) {
+    buffer.write(name);
+    if (arguments == null) return buffer;
+    buffer.write("<");
+    bool first = true;
+    for (T t in arguments) {
+      if (!first) buffer.write(", ");
+      first = false;
+      t.printOn(buffer);
+    }
+    buffer.write(">");
+    return buffer;
+  }
+}