[regexp] Experimental support for regexp named captures

src/regexp/regexp-parser.h

Index: src/regexp/regexp-parser.h
diff --git a/src/regexp/regexp-parser.h b/src/regexp/regexp-parser.h
index 6142a9ea530fc091ec1eb6aa9e09153950865ac9..31e7d442803700d61e7758e2b6233b867c62452e 100644
--- a/src/regexp/regexp-parser.h
+++ b/src/regexp/regexp-parser.h
@@ -262,6 +262,30 @@ class RegExpParser BASE_EMBEDDED {
   // Return the 1-indexed RegExpCapture object, allocate if necessary.
   RegExpCapture* GetCapture(int index);
 
+  // Creates a new named capture at the specified index. Must be called exactly
+  // once for each named capture. Fails if a capture with the same name is
+  // encountered.
+  bool CreateNamedCaptureAtIndex(Vector<const uc16> name, int index);
+
+  // Parses the name of a capture group (?<name>pattern). The name must adhere
+  // to IdentifierName in the ECMAScript standard.
+  Vector<const uc16> ParseCaptureGroupName();
+
+  bool ParseNamedBackReference(RegExpBuilder* builder,
+                               RegExpParserState* state);
+
+  // Looks up the index of the capture group with the specified name. Returns -1
+  // in case no such group is found.
+  int LookupCaptureGroupIndex(Vector<const uc16> name);
+
+  // After the initial parsing pass, patch corresponding RegExpCapture objects
+  // into all RegExpBackReferences. This is done after initial parsing in order
+  // to avoid complicating cases in which references comes before the capture.
+  void PatchNamedBackReferences();
+
+  Handle<FixedArray> CreateCaptureNameMap();
+  void FreeCaptureStrings();
+
   Isolate* isolate() { return isolate_; }
   Zone* zone() const { return zone_; }
 
@@ -278,6 +302,9 @@ class RegExpParser BASE_EMBEDDED {
   Zone* zone_;
   Handle<String>* error_;
   ZoneList<RegExpCapture*>* captures_;
+  ZoneList<RegExpCapture*>* named_captures_;
+  ZoneList<RegExpBackReference*>* named_back_references_;
+  ZoneList<Vector<const uc16>> capture_strings_;
   FlatStringReader* in_;
   uc32 current_;
   bool ignore_case_;