FlexLexer.h

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// -*-C++-*-
// FlexLexer.h -- define interfaces for lexical analyzer classes generated
// by flex
 
// Copyright (c) 1993 The Regents of the University of California.
// All rights reserved.
//
// This code is derived from software contributed to Berkeley by
// Kent Williams and Tom Epperly.
//
//  Redistribution and use in source and binary forms, with or without
//  modification, are permitted provided that the following conditions
//  are met:
 
//  1. Redistributions of source code must retain the above copyright
//  notice, this list of conditions and the following disclaimer.
//  2. 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 with the distribution.
 
//  Neither the name of the University nor the names of its contributors
//  may be used to endorse or promote products derived from this software
//  without specific prior written permission.
 
//  THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
//  IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
//  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
//  PURPOSE.
 
// This file defines FlexLexer, an abstract class which specifies the
// external interface provided to flex C++ lexer objects, and yyFlexLexer,
// which defines a particular lexer class.
//
// If you want to create multiple lexer classes, you use the -P flag
// to rename each yyFlexLexer to some other xxFlexLexer.  You then
// include <FlexLexer.h> in your other sources once per lexer class:
//
//      #undef yyFlexLexer
//      #define yyFlexLexer xxFlexLexer
//      #include <FlexLexer.h>
//
//      #undef yyFlexLexer
//      #define yyFlexLexer zzFlexLexer
//      #include <FlexLexer.h>
//      ...
 
#ifndef __FLEX_LEXER_H
// Never included before - need to define base class.
#define __FLEX_LEXER_H
 
#include <iostream>
 
extern "C++" {
 
struct yy_buffer_state;
typedef int yy_state_type;
 
class FlexLexer {
 public:
  virtual ~FlexLexer() {}
 
  const char* YYText() const { return yytext; }
  int YYLeng() const { return yyleng; }
 
  virtual void yy_switch_to_buffer(yy_buffer_state* new_buffer) = 0;
  virtual yy_buffer_state* yy_create_buffer(std::istream* s, int size) = 0;
  virtual yy_buffer_state* yy_create_buffer(std::istream& s, int size) = 0;
  virtual void yy_delete_buffer(yy_buffer_state* b) = 0;
  virtual void yyrestart(std::istream* s) = 0;
  virtual void yyrestart(std::istream& s) = 0;
 
  virtual int yylex() = 0;
 
  // Call yylex with new input/output sources.
  int yylex(std::istream& new_in, std::ostream& new_out) {
    switch_streams(new_in, new_out);
    return yylex();
  }
 
  int yylex(std::istream* new_in, std::ostream* new_out = 0) {
    switch_streams(new_in, new_out);
    return yylex();
  }
 
  // Switch to new input/output streams.  A nil stream pointer
  // indicates "keep the current one".
  virtual void switch_streams(std::istream* new_in, std::ostream* new_out) = 0;
  virtual void switch_streams(std::istream& new_in, std::ostream& new_out) = 0;
 
  int lineno() const { return yylineno; }
 
  int debug() const { return yy_flex_debug; }
  void set_debug(int flag) { yy_flex_debug = flag; }
 
 protected:
  char* yytext;
  int yyleng;
  int yylineno;       // only maintained if you use %option yylineno
  int yy_flex_debug;  // only has effect with -d or "%option debug"
};
}
#endif  // FLEXLEXER_H
 
#if defined(yyFlexLexer) || !defined(yyFlexLexerOnce)
// Either this is the first time through (yyFlexLexerOnce not defined),
// or this is a repeated include to define a different flavor of
// yyFlexLexer, as discussed in the flex manual.
#define yyFlexLexerOnce
 
extern "C++" {
 
class yyFlexLexer : public FlexLexer {
 public:
  // arg_yyin and arg_yyout default to the cin and cout, but we
  // only make that assignment when initializing in yylex().
  yyFlexLexer(std::istream& arg_yyin, std::ostream& arg_yyout);
  yyFlexLexer(std::istream* arg_yyin = 0, std::ostream* arg_yyout = 0);
 
 private:
  void ctor_common();
 
 public:
  virtual ~yyFlexLexer();
 
  void yy_switch_to_buffer(yy_buffer_state* new_buffer);
  yy_buffer_state* yy_create_buffer(std::istream* s, int size);
  yy_buffer_state* yy_create_buffer(std::istream& s, int size);
  void yy_delete_buffer(yy_buffer_state* b);
  void yyrestart(std::istream* s);
  void yyrestart(std::istream& s);
 
  void yypush_buffer_state(yy_buffer_state* new_buffer);
  void yypop_buffer_state();
 
  virtual int yylex();
  virtual void switch_streams(std::istream& new_in, std::ostream& new_out);
  virtual void switch_streams(std::istream* new_in = 0,
                              std::ostream* new_out = 0);
  virtual int yywrap();
 
 protected:
  virtual int LexerInput(char* buf, int max_size);
  virtual void LexerOutput(const char* buf, int size);
  virtual void LexerError(const char* msg);
 
  void yyunput(int c, char* buf_ptr);
  int yyinput();
 
  void yy_load_buffer_state();
  void yy_init_buffer(yy_buffer_state* b, std::istream& s);
  void yy_flush_buffer(yy_buffer_state* b);
 
  int yy_start_stack_ptr;
  int yy_start_stack_depth;
  int* yy_start_stack;
 
  void yy_push_state(int new_state);
  void yy_pop_state();
  int yy_top_state();
 
  yy_state_type yy_get_previous_state();
  yy_state_type yy_try_NUL_trans(yy_state_type current_state);
  int yy_get_next_buffer();
 
  std::istream yyin;   // input source for default LexerInput
  std::ostream yyout;  // output sink for default LexerOutput
 
  // yy_hold_char holds the character lost when yytext is formed.
  char yy_hold_char;
 
  // Number of characters read into yy_ch_buf.
  int yy_n_chars;
 
  // Points to current character in buffer.
  char* yy_c_buf_p;
 
  int yy_init;   // whether we need to initialize
  int yy_start;  // start state number
 
  // Flag which is used to allow yywrap()'s to do buffer switches
  // instead of setting up a fresh yyin.  A bit of a hack ...
  int yy_did_buffer_switch_on_eof;
 
  size_t yy_buffer_stack_top;        
  size_t yy_buffer_stack_max;        
  yy_buffer_state** yy_buffer_stack; 
  void yyensure_buffer_stack(void);
 
  // The following are not always needed, but may be depending
  // on use of certain flex features (like REJECT or yymore()).
 
  yy_state_type yy_last_accepting_state;
  char* yy_last_accepting_cpos;
 
  yy_state_type* yy_state_buf;
  yy_state_type* yy_state_ptr;
 
  char* yy_full_match;
  int* yy_full_state;
  int yy_full_lp;
 
  int yy_lp;
  int yy_looking_for_trail_begin;
 
  int yy_more_flag;
  int yy_more_len;
  int yy_more_offset;
  int yy_prev_more_offset;
};
}
 
#endif  // yyFlexLexer || ! yyFlexLexerOnce