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FlexLexer.h
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
56extern "C++" {
57
58struct yy_buffer_state;
59typedef int yy_state_type;
60
61class FlexLexer {
62public:
63 virtual ~FlexLexer() { }
64
65 const char* YYText() const { return yytext; }
66 int 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
94protected:
95 char* yytext;
96 int 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
110extern "C++" {
111
112class yyFlexLexer : public FlexLexer {
113public:
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
132protected:
133 virtual int LexerInput( char* buf, int max_size );
134 virtual void LexerOutput( const char* buf, int 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 int 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;
177 size_t yy_buffer_stack_max;
178 struct yy_buffer_state ** yy_buffer_stack;
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
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