Parser / Scanner: Minor refactorings to make streaming scripts work easier.

src/scanner-character-streams.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_SCANNER_CHARACTER_STREAMS_H_
 #define V8_SCANNER_CHARACTER_STREAMS_H_
 
 #include "src/scanner.h"
 
 namespace v8 {
@@ skipping 11 matching lines @@
 
  protected:
   static const unsigned kBufferSize = 512;
   static const unsigned kPushBackStepSize = 16;
 
   virtual unsigned SlowSeekForward(unsigned delta);
   virtual bool ReadBlock();
   virtual void SlowPushBack(uc16 character);
 
   virtual unsigned BufferSeekForward(unsigned delta) = 0;
-  virtual unsigned FillBuffer(unsigned position, unsigned length) = 0;
+  virtual unsigned FillBuffer(unsigned position) = 0;
 
   const uc16* pushback_limit_;
   uc16 buffer_[kBufferSize];
 };
 
 
 // Generic string stream.
 class GenericStringUtf16CharacterStream: public BufferedUtf16CharacterStream {
  public:
   GenericStringUtf16CharacterStream(Handle<String> data,
                                     unsigned start_position,
                                     unsigned end_position);
   virtual ~GenericStringUtf16CharacterStream();
 
  protected:
   virtual unsigned BufferSeekForward(unsigned delta);
-  virtual unsigned FillBuffer(unsigned position, unsigned length);
+  virtual unsigned FillBuffer(unsigned position);
 
   Handle<String> string_;
   unsigned length_;
 };
 
 
 // Utf16 stream based on a literal UTF-8 string.
 class Utf8ToUtf16CharacterStream: public BufferedUtf16CharacterStream {
  public:
   Utf8ToUtf16CharacterStream(const byte* data, unsigned length);
   virtual ~Utf8ToUtf16CharacterStream();
 
  protected:
   virtual unsigned BufferSeekForward(unsigned delta);
-  virtual unsigned FillBuffer(unsigned char_position, unsigned length);
+  virtual unsigned FillBuffer(unsigned char_position);
   void SetRawPosition(unsigned char_position);
 
   const byte* raw_data_;
   unsigned raw_data_length_;  // Measured in bytes, not characters.
   unsigned raw_data_pos_;
   // The character position of the character at raw_data[raw_data_pos_].
   // Not necessarily the same as pos_.
   unsigned raw_character_position_;
 };
 
@@ skipping 21 matching lines @@
     // Entire string is read at start.
     return false;
   }
   Handle<ExternalTwoByteString> source_;
   const uc16* raw_data_;  // Pointer to the actual array of characters.
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_SCANNER_CHARACTER_STREAMS_H_