Backreferences

src/ast.h

Index: src/ast.h
diff --git a/src/ast.h b/src/ast.h
index 8972f2566734b062c25f31869a754018502069d0..00004791153fd48ed84085d2514dd620f3295dac 100644
--- a/src/ast.h
+++ b/src/ast.h
@@ -1193,6 +1193,7 @@ class ThisFunction: public Expression {
   VISIT(Quantifier)                                                  \
   VISIT(Capture)                                                     \
   VISIT(Lookahead)                                                   \
+  VISIT(Backreference)                                               \
   VISIT(Empty)
 
 
@@ -1357,6 +1358,16 @@ class RegExpLookahead: public RegExpTree {
 };
 
 
+class RegExpBackreference: public RegExpTree {
+ public:
+  explicit RegExpBackreference(int index) : index_(index) { }
+  virtual void* Accept(RegExpVisitor* visitor, void* data);
+  int index() { return index_; }
+ private:
+  int index_;
+};
+
+
 class RegExpEmpty: public RegExpTree {
  public:
   RegExpEmpty() { }