Generate AST node for factory methods.

dart/frog/leg/tree/nodes.dart

 // Copyright (c) 2011, 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.
 
 interface Visitor<R> {
   R visitBlock(Block node);
   R visitClassNode(ClassNode node);
   R visitConditional(Conditional node);
   R visitDoWhile(DoWhile node);
   R visitExpressionStatement(ExpressionStatement node);
@@ skipping 790 matching lines @@
 
   final NodeList nodes;
   /** Bit pattern to easy check what modifiers are present. */
   final int flags;
 
   static final int FLAG_STATIC = 1;
   static final int FLAG_ABSTRACT = FLAG_STATIC << 1;
   static final int FLAG_FINAL = FLAG_ABSTRACT << 1;
   static final int FLAG_VAR = FLAG_FINAL << 1;
   static final int FLAG_CONST = FLAG_VAR << 1;
+  static final int FLAG_FACTORY = FLAG_CONST << 1;
 
   Modifiers(NodeList nodes)
     : this.nodes = nodes, flags = computeFlags(nodes.nodes);
 
   static int computeFlags(Link<Node> nodes) {
     int flags = 0;
     for (; !nodes.isEmpty(); nodes = nodes.tail) {
       String value = nodes.head.asIdentifier().source.stringValue;
       if (value === 'static') flags += FLAG_STATIC;
       else if (value === 'abstract') flags += FLAG_ABSTRACT;
       else if (value === 'final') flags += FLAG_FINAL;
       else if (value === 'var') flags += FLAG_VAR;
       else if (value === 'const') flags += FLAG_CONST;
+      else if (value === 'factory') flags += FLAG_FACTORY;
+      else throw 'internal error: ${nodes.head}';
     }
     return flags;
   }
 
   Modifiers asModifiers() => this;
   Token getBeginToken() => nodes.getBeginToken();
   Token getEndToken() => nodes.getEndToken();
   accept(Visitor visitor) => visitor.visitModifiers(this);
   visitChildren(Visitor visitor) => nodes.accept(visitor);
 
   bool isStatic() => (flags & FLAG_STATIC) != 0;
   bool isAbstract() => (flags & FLAG_ABSTRACT) != 0;
   bool isFinal() => (flags & FLAG_FINAL) != 0;
   bool isVar() => (flags & FLAG_VAR) != 0;
   bool isConst() => (flags & FLAG_CONST) != 0;
+  bool isFactory() => (flags & FLAG_FACTORY) != 0;
 }
 
 class StringInterpolation extends Expression {
   final LiteralString string;
   final NodeList parts;
 
   StringInterpolation(this.string, this.parts);
 
   StringInterpolation asStringInterpolation() => this;
 
@@ skipping 49 matching lines @@
 
   UnimplementedStatement(this.description, List<Node> nodes)
     : this.nodes = new NodeList(null, new Link<Node>.fromList(nodes));
 
   toString() => '$description($nodes)';
 
   Token getBeginToken() => nodes.getBeginToken();
 
   Token getEndToken() => nodes.getEndToken();
 }