// $Header$

// 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 <ossim/base/FlexLexer.h> */
//	...

#ifndef OSSIM__FLEX_LEXER_H
// Never included before - need to define base class.
#define OSSIM__FLEX_LEXER_H
#include <iostream>
#include <ossim/base/ossimConstants.h>

extern "C++" {

struct yy_buffer_state;
typedef int yy_state_type;

class OSSIMDLLEXPORT 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( std::istream* s, int size ) = 0;
   virtual void yy_delete_buffer( struct yy_buffer_state* b ) = 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 = 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 = 0,
                                std::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 OSSIMDLLEXPORT 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 = 0, std::ostream* arg_yyout = 0 );

   virtual ~yyFlexLexer();

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

   virtual int yylex();
   virtual void switch_streams( std::istream* new_in, std::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, std::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();

   std::istream* yyin;	// input source for default LexerInput
   std::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
