Experimental lexer generator: Don't go BACK();

src/lexer/even-more-experimental-scanner.cc

 // 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
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 101 matching lines @@
 bool EvenMoreExperimentalScanner::ValidIdentifierStart() {
   return unicode_cache_->IsIdentifierStart(ScanHexNumber(4));
 }
 
 
 uint32_t EvenMoreExperimentalScanner::push(const void *input, int input_size) {
   // FIXME: for now, we can only push once and that'll read the input.
   if (input_size == 0)
     return 0;
   buffer_ = const_cast<YYCTYPE*>(reinterpret_cast<const YYCTYPE*>(input));
-  cursor_ = buffer_ - 1;
+  cursor_ = buffer_;
   start_ = buffer_;
   buffer_end_ = buffer_ + input_size;
   return DoLex();
 }
 
 
 void EvenMoreExperimentalScanner::send(Token::Value token) {
   int beg = start_ - buffer_;
   int end = cursor_ - buffer_;
   sink_->Record(token, beg, end);
 }
 
 
 }
 }