Experimental parser: add UnicodeCache.

src/lexer/lexer.h

 // Portions of this code based on re2c:
 //   (re2c/examples/push.re)
 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
@@ skipping 19 matching lines @@
 #ifndef V8_LEXER_LEXER_H
 #define V8_LEXER_LEXER_H
 
 #include "token.h"
 #include "flags.h"
 
 namespace v8 {
 namespace internal {
 
 class ExperimentalScanner;
+class UnicodeCache;
 
 class PushScanner {
  public:
-  explicit PushScanner(ExperimentalScanner* sink);
+  explicit PushScanner(ExperimentalScanner* sink, UnicodeCache* unicode_cache);
 
   ~PushScanner();
 
   void send(v8::internal::Token::Value token);
   uint32_t push(const void *input, int input_size);
 
  private:
+  bool ValidIdentifierStart();
+  bool ValidIdentifierPart();
+  uc32 ScanHexNumber(int length);
+
+  UnicodeCache* unicode_cache_;
+
   bool eof_;
   int32_t state_;
   int32_t condition_;
 
   uint8_t* limit_;
   uint8_t* start_;
   uint8_t* cursor_;
   uint8_t* marker_;
   int real_start_;
 
   uint8_t* buffer_;
   uint8_t* buffer_end_;
 
   uint8_t yych;
   uint32_t yyaccept;
 
   ExperimentalScanner* sink_;
 };
 
 } }
 
 #endif  // V8_LEXER_LEXER_H