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// $Header: /home/daffy/u0/vern/flex/RCS/FlexLexer.h,v 1.19 96/05/25 20:43:02 vern Exp $

// 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: (1) source distributions retain
// this entire copyright notice and comment, and (2) distributions including
// binaries display the following acknowledgement:  ``This product includes
// software developed by the University of California, Berkeley and its
// contributors'' in the documentation or other materials provided with the
// distribution and in all advertising materials mentioning features or use
// of this software.  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 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.h>

extern "C++" {

struct yy_buffer_state;
typedef int yy_state_type;

class FlexLexer {
      virtual ~FlexLexer()    { }

      const char* YYText()    { return yytext; }
      int YYLeng()            { return yyleng; }

      virtual void
            yy_switch_to_buffer( struct yy_buffer_state* new_buffer ) = 0;
      virtual struct yy_buffer_state*
            yy_create_buffer( istream* s, int size ) = 0;
      virtual void yy_delete_buffer( struct yy_buffer_state* b ) = 0;
      virtual void yyrestart( istream* s ) = 0;

      virtual int yylex() = 0;

      // Call yylex with new input/output sources.
      int yylex( istream* new_in, 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( istream* new_in = 0,
                              ostream* new_out = 0 ) = 0;

      int lineno() const            { return yylineno; }

      int debug() const       { return yy_flex_debug; }
      void set_debug( int flag )    { yy_flex_debug = flag; }

      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"


#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 man page.
#define yyFlexLexerOnce

class yyFlexLexer : public FlexLexer {
      // arg_yyin and arg_yyout default to the cin and cout, but we
      // only make that assignment when initializing in yylex().
      yyFlexLexer( istream* arg_yyin = 0, ostream* arg_yyout = 0 );

      virtual ~yyFlexLexer();

      void yy_switch_to_buffer( struct yy_buffer_state* new_buffer );
      struct yy_buffer_state* yy_create_buffer( istream* s, int size );
      void yy_delete_buffer( struct yy_buffer_state* b );
      void yyrestart( istream* s );

      virtual int yylex();
      virtual void switch_streams( istream* new_in, ostream* new_out );

      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( struct yy_buffer_state* b, istream* s );
      void yy_flush_buffer( struct 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();

      istream* yyin;    // input source for default LexerInput
      ostream* yyout;   // output sink for default LexerOutput

      struct yy_buffer_state* yy_current_buffer;

      // 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;

      // 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;


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