/*

  * Copyright (C) 2012 David Anderson

  *

  * This file is part of JITCraft.

  *

  * JITCraft is free software: you can redistribute it and/or modify it under

  * the terms of the GNU General Public License as published by the Free

  * Software Foundation, either version 3 of the License, or (at your option)

  * any later version.

  * 

  * Foobar is distributed in the hope that it will be useful, but WITHOUT ANY

  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS

  * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

  *

  * You should have received a copy of the GNU General Public License along with

  * JITCraft. If not, see http://www.gnu.org/licenses/.

  */

 #ifndef _include_jitcraft_scanner_h_

 #define _include_jitcraft_scanner_h_

 #include <string>

 #include "Token.h"

 #include "CompileContext.h"

 namespace ke {

 class Scanner

 {

     CompileContext &cc_;

     const char *stream_;

     size_t length_;

     bool pushed_;

     char saved_;

     const char *pos_;

     std::string literal_;

     TokenKind lastToken_;

     SourcePosition last_;

     SourcePosition cur_;

     SourcePosition begin_;

   private:

     char getChar();

     void putChar(char c);

     void eatSingleLine();

     bool eatComment();

     void calcNewLine(char c);

     int readEscapeCode();

     TokenKind stringLiteral();

     TokenKind numberLiteral(char first);

     TokenKind identifier(char first);

     TokenKind next();

   public:

     Scanner(CompileContext &cc, const char *stream, size_t length);

     static double ParseDouble(const char *string);

     TokenKind scan();

     TokenKind peek();

     TokenKind last() const {

         return lastToken_;

     }

     // Beginning source position of the last instruction.

     SourcePosition begin() const {

         return begin_;

     }

     // Note: the literal may have embedded NUL characters.

     const char *literal() const {

         return literal_.c_str();

     }

     size_t literal_length() const {

         return literal_.size();

     }

 };

 } // namespace ke

 #endif // _include_jitcraft_scanner_h_