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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 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() { 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 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
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