1  // -*-C++-*-
  2  // FlexLexer.h -- define interfaces for lexical analyzer classes generated
  3  // by flex
  4  
  5  // Copyright (c) 1993 The Regents of the University of California.
  6  // All rights reserved.
  7  //
  8  // This code is derived from software contributed to Berkeley by
  9  // Kent Williams and Tom Epperly.
 10  //
 11  //  Redistribution and use in source and binary forms, with or without
 12  //  modification, are permitted provided that the following conditions
 13  //  are met:
 14  
 15  //  1. Redistributions of source code must retain the above copyright
 16  //  notice, this list of conditions and the following disclaimer.
 17  //  2. Redistributions in binary form must reproduce the above copyright
 18  //  notice, this list of conditions and the following disclaimer in the
 19  //  documentation and/or other materials provided with the distribution.
 20  
 21  //  Neither the name of the University nor the names of its contributors
 22  //  may be used to endorse or promote products derived from this software
 23  //  without specific prior written permission.
 24  
 25  //  THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 26  //  IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 27  //  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 28  //  PURPOSE.
 29  
 30  // This file defines FlexLexer, an abstract class which specifies the
 31  // external interface provided to flex C++ lexer objects, and yyFlexLexer,
 32  // which defines a particular lexer class.
 33  //
 34  // If you want to create multiple lexer classes, you use the -P flag
 35  // to rename each yyFlexLexer to some other xxFlexLexer.  You then
 36  // include <FlexLexer.h> in your other sources once per lexer class:
 37  //
 38  //	#undef yyFlexLexer
 39  //	#define yyFlexLexer xxFlexLexer
 40  //	#include <FlexLexer.h>
 41  //
 42  //	#undef yyFlexLexer
 43  //	#define yyFlexLexer zzFlexLexer
 44  //	#include <FlexLexer.h>
 45  //	...
 46  
 47  #ifndef __FLEX_LEXER_H
 48  // Never included before - need to define base class.
 49  #define __FLEX_LEXER_H
 50  
 51  #include <iostream>
 52  #  ifndef FLEX_STD
 53  #    define FLEX_STD std::
 54  #  endif
 55  
 56  extern "C++" {
 57  
 58  struct yy_buffer_state;
 59  typedef int yy_state_type;
 60  
 61  class FlexLexer {
 62  public:
 63  	virtual ~FlexLexer()	{ }
 64  
 65  	const char* YYText() const	{ return yytext; }
 66  	size_t YYLeng()	const	{ return yyleng; }
 67  
 68  	virtual void
 69  		yy_switch_to_buffer( struct yy_buffer_state* new_buffer ) = 0;
 70  	virtual struct yy_buffer_state*
 71  		yy_create_buffer( FLEX_STD istream* s, int size ) = 0;
 72  	virtual void yy_delete_buffer( struct yy_buffer_state* b ) = 0;
 73  	virtual void yyrestart( FLEX_STD istream* s ) = 0;
 74  
 75  	virtual int yylex() = 0;
 76  
 77  	// Call yylex with new input/output sources.
 78  	int yylex( FLEX_STD istream* new_in, FLEX_STD ostream* new_out = 0 )
 79  		{
 80  		switch_streams( new_in, new_out );
 81  		return yylex();
 82  		}
 83  
 84  	// Switch to new input/output streams.  A nil stream pointer
 85  	// indicates "keep the current one".
 86  	virtual void switch_streams( FLEX_STD istream* new_in = 0,
 87  					FLEX_STD ostream* new_out = 0 ) = 0;
 88  
 89  	int lineno() const		{ return yylineno; }
 90  
 91  	int debug() const		{ return yy_flex_debug; }
 92  	void set_debug( int flag )	{ yy_flex_debug = flag; }
 93  
 94  protected:
 95  	char* yytext;
 96  	size_t yyleng;
 97  	int yylineno;		// only maintained if you use %option yylineno
 98  	int yy_flex_debug;	// only has effect with -d or "%option debug"
 99  };
100  
101  }
102  #endif // FLEXLEXER_H
103  
104  #if defined(yyFlexLexer) || ! defined(yyFlexLexerOnce)
105  // Either this is the first time through (yyFlexLexerOnce not defined),
106  // or this is a repeated include to define a different flavor of
107  // yyFlexLexer, as discussed in the flex manual.
108  #define yyFlexLexerOnce
109  
110  extern "C++" {
111  
112  class yyFlexLexer : public FlexLexer {
113  public:
114  	// arg_yyin and arg_yyout default to the cin and cout, but we
115  	// only make that assignment when initializing in yylex().
116  	yyFlexLexer( FLEX_STD istream* arg_yyin = 0, FLEX_STD ostream* arg_yyout = 0 );
117  
118  	virtual ~yyFlexLexer();
119  
120  	void yy_switch_to_buffer( struct yy_buffer_state* new_buffer );
121  	struct yy_buffer_state* yy_create_buffer( FLEX_STD istream* s, int size );
122  	void yy_delete_buffer( struct yy_buffer_state* b );
123  	void yyrestart( FLEX_STD istream* s );
124  
125  	void yypush_buffer_state( struct yy_buffer_state* new_buffer );
126  	void yypop_buffer_state();
127  
128  	virtual int yylex();
129  	virtual void switch_streams( FLEX_STD istream* new_in, FLEX_STD ostream* new_out = 0 );
130  	virtual int yywrap();
131  
132  protected:
133  	virtual size_t LexerInput( char* buf, size_t max_size );
134  	virtual void LexerOutput( const char* buf, size_t size );
135  	virtual void LexerError( const char* msg );
136  
137  	void yyunput( int c, char* buf_ptr );
138  	int yyinput();
139  
140  	void yy_load_buffer_state();
141  	void yy_init_buffer( struct yy_buffer_state* b, FLEX_STD istream* s );
142  	void yy_flush_buffer( struct yy_buffer_state* b );
143  
144  	int yy_start_stack_ptr;
145  	int yy_start_stack_depth;
146  	int* yy_start_stack;
147  
148  	void yy_push_state( int new_state );
149  	void yy_pop_state();
150  	int yy_top_state();
151  
152  	yy_state_type yy_get_previous_state();
153  	yy_state_type yy_try_NUL_trans( yy_state_type current_state );
154  	int yy_get_next_buffer();
155  
156  	FLEX_STD istream* yyin;	// input source for default LexerInput
157  	FLEX_STD ostream* yyout;	// output sink for default LexerOutput
158  
159  	// yy_hold_char holds the character lost when yytext is formed.
160  	char yy_hold_char;
161  
162  	// Number of characters read into yy_ch_buf.
163  	size_t yy_n_chars;
164  
165  	// Points to current character in buffer.
166  	char* yy_c_buf_p;
167  
168  	int yy_init;		// whether we need to initialize
169  	int yy_start;		// start state number
170  
171  	// Flag which is used to allow yywrap()'s to do buffer switches
172  	// instead of setting up a fresh yyin.  A bit of a hack ...
173  	int yy_did_buffer_switch_on_eof;
174  
175  
176  	size_t yy_buffer_stack_top; /**< index of top of stack. */
177  	size_t yy_buffer_stack_max; /**< capacity of stack. */
178  	struct yy_buffer_state ** yy_buffer_stack; /**< Stack as an array. */
179  	void yyensure_buffer_stack(void);
180  
181  	// The following are not always needed, but may be depending
182  	// on use of certain flex features (like REJECT or yymore()).
183  
184  	yy_state_type yy_last_accepting_state;
185  	char* yy_last_accepting_cpos;
186  
187  	yy_state_type* yy_state_buf;
188  	yy_state_type* yy_state_ptr;
189  
190  	char* yy_full_match;
191  	int* yy_full_state;
192  	int yy_full_lp;
193  
194  	int yy_lp;
195  	int yy_looking_for_trail_begin;
196  
197  	int yy_more_flag;
198  	int yy_more_len;
199  	int yy_more_offset;
200  	int yy_prev_more_offset;
201  };
202  
203  }
204  
205  #endif // yyFlexLexer || ! yyFlexLexerOnce
206