2 // FlexLexer.h -- define interfaces for lexical analyzer classes generated
5 // Copyright (c) 1993 The Regents of the University of California.
6 // All rights reserved.
8 // This code is derived from software contributed to Berkeley by
9 // Kent Williams and Tom Epperly.
11 // Redistribution and use in source and binary forms, with or without
12 // modification, are permitted provided that the following conditions
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.
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.
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
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.
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:
39 // #define yyFlexLexer xxFlexLexer
40 // #include <FlexLexer.h>
43 // #define yyFlexLexer zzFlexLexer
44 // #include <FlexLexer.h>
47 #ifndef __FLEX_LEXER_H
48 // Never included before - need to define base class.
49 #define __FLEX_LEXER_H
53 # define FLEX_STD std::
58 struct yy_buffer_state;
59 typedef int yy_state_type;
63 virtual ~FlexLexer() { }
65 const char* YYText() const { return yytext; }
66 int YYLeng() const { return yyleng; }
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;
75 virtual int yylex() = 0;
77 // Call yylex with new input/output sources.
78 int yylex( FLEX_STD istream* new_in, FLEX_STD ostream* new_out = 0 )
80 switch_streams( new_in, new_out );
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;
89 int lineno() const { return yylineno; }
91 int debug() const { return yy_flex_debug; }
92 void set_debug( int flag ) { yy_flex_debug = flag; }
97 int yylineno; // only maintained if you use %option yylineno
98 int yy_flex_debug; // only has effect with -d or "%option debug"
102 #endif // FLEXLEXER_H
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
112 class yyFlexLexer : public FlexLexer {
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 );
118 virtual ~yyFlexLexer();
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 );
125 void yypush_buffer_state( struct yy_buffer_state* new_buffer );
126 void yypop_buffer_state();
129 virtual void switch_streams( FLEX_STD istream* new_in, FLEX_STD ostream* new_out = 0 );
130 virtual int yywrap();
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 );
137 void yyunput( int c, char* buf_ptr );
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 );
144 int yy_start_stack_ptr;
145 int yy_start_stack_depth;
148 void yy_push_state( int new_state );
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();
156 FLEX_STD istream* yyin; // input source for default LexerInput
157 FLEX_STD ostream* yyout; // output sink for default LexerOutput
159 // yy_hold_char holds the character lost when yytext is formed.
162 // Number of characters read into yy_ch_buf.
165 // Points to current character in buffer.
168 int yy_init; // whether we need to initialize
169 int yy_start; // start state number
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;
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);
181 // The following are not always needed, but may be depending
182 // on use of certain flex features (like REJECT or yymore()).
184 yy_state_type yy_last_accepting_state;
185 char* yy_last_accepting_cpos;
187 yy_state_type* yy_state_buf;
188 yy_state_type* yy_state_ptr;
195 int yy_looking_for_trail_begin;
200 int yy_prev_more_offset;
205 #endif // yyFlexLexer || ! yyFlexLexerOnce