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Viewing File: FlexLexer.h

// $Header$

// 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 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 FLEXLEXER_H
// Never included before - need to define base class.
#define FLEXLEXER_H
#include <iostream.h>

extern "C++" {

struct yy_buffer_state;
typedef int yy_state_type;

class FlexLexer {
public:
	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; }

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

#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 {
public:
	// 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 );

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( 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;
};

#endif
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