/usr.bin/lex/FlexLexer.h

  1// $Header: /home/daffy/u0/vern/flex/RCS/FlexLexer.h,v 1.19 96/05/25 20:43:02 vern Exp $
  2// $FreeBSD$
  3
  4// FlexLexer.h -- define interfaces for lexical analyzer classes generated
  5//		  by flex
  6
  7// Copyright (c) 1993 The Regents of the University of California.
  8// All rights reserved.
  9//
 10// This code is derived from software contributed to Berkeley by
 11// Kent Williams and Tom Epperly.
 12//
 13// Redistribution and use in source and binary forms are permitted provided
 14// that: (1) source distributions retain this entire copyright notice and
 15// comment, and (2) distributions including binaries display the following
 16// acknowledgement:  ``This product includes software developed by the
 17// University of California, Berkeley and its contributors'' in the
 18// documentation or other materials provided with the distribution and in
 19// all advertising materials mentioning features or use of this software.
 20// Neither the name of the University nor the names of its contributors may
 21// be used to endorse or promote products derived from this software without
 22// specific prior written permission.
 23// THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 24// WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 25// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 26
 27// This file defines FlexLexer, an abstract class which specifies the
 28// external interface provided to flex C++ lexer objects, and yyFlexLexer,
 29// which defines a particular lexer class.
 30//
 31// If you want to create multiple lexer classes, you use the -P flag
 32// to rename each yyFlexLexer to some other xxFlexLexer.  You then
 33// include <FlexLexer.h> in your other sources once per lexer class:
 34//
 35//	#undef yyFlexLexer
 36//	#define yyFlexLexer xxFlexLexer
 37//	#include <FlexLexer.h>
 38//
 39//	#undef yyFlexLexer
 40//	#define yyFlexLexer zzFlexLexer
 41//	#include <FlexLexer.h>
 42//	...
 43
 44#ifndef __FLEX_LEXER_H
 45// Never included before - need to define base class.
 46#define __FLEX_LEXER_H
 47#include <iostream>
 48
 49extern "C++" {
 50
 51struct yy_buffer_state;
 52typedef int yy_state_type;
 53
 54class FlexLexer {
 55public:
 56	virtual ~FlexLexer()	{ }
 57
 58	const char* YYText()	{ return yytext; }
 59	int YYLeng()		{ return yyleng; }
 60
 61	virtual void
 62		yy_switch_to_buffer( struct yy_buffer_state* new_buffer ) = 0;
 63	virtual struct yy_buffer_state*
 64		yy_create_buffer( std::istream* s, int size ) = 0;
 65	virtual void yy_delete_buffer( struct yy_buffer_state* b ) = 0;
 66	virtual void yyrestart( std::istream* s ) = 0;
 67
 68	virtual int yylex() = 0;
 69
 70	// Call yylex with new input/output sources.
 71	int yylex( std::istream* new_in, std::ostream* new_out = 0 )
 72		{
 73		switch_streams( new_in, new_out );
 74		return yylex();
 75		}
 76
 77	// Switch to new input/output streams.  A nil stream pointer
 78	// indicates "keep the current one".
 79	virtual void switch_streams( std::istream* new_in = 0,
 80					std::ostream* new_out = 0 ) = 0;
 81
 82	int lineno() const		{ return yylineno; }
 83
 84	int debug() const		{ return yy_flex_debug; }
 85	void set_debug( int flag )	{ yy_flex_debug = flag; }
 86
 87protected:
 88	char* yytext;
 89	int yyleng;
 90	int yylineno;		// only maintained if you use %option yylineno
 91	int yy_flex_debug;	// only has effect with -d or "%option debug"
 92};
 93
 94}
 95#endif
 96
 97#if defined(yyFlexLexer) || ! defined(yyFlexLexerOnce)
 98// Either this is the first time through (yyFlexLexerOnce not defined),
 99// or this is a repeated include to define a different flavor of
100// yyFlexLexer, as discussed in the flex man page.
101#define yyFlexLexerOnce
102
103class yyFlexLexer : public FlexLexer {
104public:
105	// arg_yyin and arg_yyout default to the cin and cout, but we
106	// only make that assignment when initializing in yylex().
107	yyFlexLexer( std::istream* arg_yyin = 0, std::ostream* arg_yyout = 0 );
108
109	virtual ~yyFlexLexer();
110
111	void yy_switch_to_buffer( struct yy_buffer_state* new_buffer );
112	struct yy_buffer_state* yy_create_buffer( std::istream* s, int size );
113	void yy_delete_buffer( struct yy_buffer_state* b );
114	void yyrestart( std::istream* s );
115
116	virtual int yylex();
117	virtual void switch_streams( std::istream* new_in, std::ostream* new_out );
118
119protected:
120	virtual int LexerInput( char* buf, int max_size );
121	virtual void LexerOutput( const char* buf, int size );
122	virtual void LexerError( const char* msg );
123
124	void yyunput( int c, char* buf_ptr );
125	int yyinput();
126
127	void yy_load_buffer_state();
128	void yy_init_buffer( struct yy_buffer_state* b, std::istream* s );
129	void yy_flush_buffer( struct yy_buffer_state* b );
130
131	int yy_start_stack_ptr;
132	int yy_start_stack_depth;
133	int* yy_start_stack;
134
135	void yy_push_state( int new_state );
136	void yy_pop_state();
137	int yy_top_state();
138
139	yy_state_type yy_get_previous_state();
140	yy_state_type yy_try_NUL_trans( yy_state_type current_state );
141	int yy_get_next_buffer();
142
143	std::istream* yyin;	// input source for default LexerInput
144	std::ostream* yyout;	// output sink for default LexerOutput
145
146	struct yy_buffer_state* yy_current_buffer;
147
148	// yy_hold_char holds the character lost when yytext is formed.
149	char yy_hold_char;
150
151	// Number of characters read into yy_ch_buf.
152	int yy_n_chars;
153
154	// Points to current character in buffer.
155	char* yy_c_buf_p;
156
157	int yy_init;		// whether we need to initialize
158	int yy_start;		// start state number
159
160	// Flag which is used to allow yywrap()'s to do buffer switches
161	// instead of setting up a fresh yyin.  A bit of a hack ...
162	int yy_did_buffer_switch_on_eof;
163
164	// The following are not always needed, but may be depending
165	// on use of certain flex features (like REJECT or yymore()).
166
167	yy_state_type yy_last_accepting_state;
168	char* yy_last_accepting_cpos;
169
170	yy_state_type* yy_state_buf;
171	yy_state_type* yy_state_ptr;
172
173	char* yy_full_match;
174	int* yy_full_state;
175	int yy_full_lp;
176
177	int yy_lp;
178	int yy_looking_for_trail_begin;
179
180	int yy_more_flag;
181	int yy_more_len;
182	int yy_more_offset;
183	int yy_prev_more_offset;
184};
185
186#endif