Annotation of src/usr.bin/lex/FlexLexer.h, Revision 1.7
1.7 ! tedu 1: /* $OpenBSD: FlexLexer.h,v 1.6 2004/02/03 21:20:17 espie Exp $ */
1.2 deraadt 2:
1.7 ! tedu 3: // $Header: /cvs/src/usr.bin/lex/FlexLexer.h,v 1.6 2004/02/03 21:20:17 espie Exp $
1.1 deraadt 4:
1.7 ! tedu 5: // -*-C++-*-
1.1 deraadt 6: // FlexLexer.h -- define interfaces for lexical analyzer classes generated
1.7 ! tedu 7: // by flex
1.1 deraadt 8:
9: // Copyright (c) 1993 The Regents of the University of California.
10: // All rights reserved.
11: //
12: // This code is derived from software contributed to Berkeley by
13: // Kent Williams and Tom Epperly.
14: //
1.7 ! tedu 15: // Redistribution and use in source and binary forms, with or without
! 16: // modification, are permitted provided that the following conditions
! 17: // are met:
! 18:
! 19: // 1. Redistributions of source code must retain the above copyright
! 20: // notice, this list of conditions and the following disclaimer.
! 21: // 2. Redistributions in binary form must reproduce the above copyright
! 22: // notice, this list of conditions and the following disclaimer in the
! 23: // documentation and/or other materials provided with the distribution.
! 24:
! 25: // Neither the name of the University nor the names of its contributors
! 26: // may be used to endorse or promote products derived from this software
! 27: // without specific prior written permission.
! 28:
! 29: // THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
! 30: // IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
! 31: // WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
! 32: // PURPOSE.
1.1 deraadt 33:
34: // This file defines FlexLexer, an abstract class which specifies the
35: // external interface provided to flex C++ lexer objects, and yyFlexLexer,
36: // which defines a particular lexer class.
37: //
38: // If you want to create multiple lexer classes, you use the -P flag
39: // to rename each yyFlexLexer to some other xxFlexLexer. You then
40: // include <FlexLexer.h> in your other sources once per lexer class:
41: //
42: // #undef yyFlexLexer
43: // #define yyFlexLexer xxFlexLexer
44: // #include <FlexLexer.h>
45: //
46: // #undef yyFlexLexer
47: // #define yyFlexLexer zzFlexLexer
48: // #include <FlexLexer.h>
49: // ...
50:
51: #ifndef __FLEX_LEXER_H
52: // Never included before - need to define base class.
53: #define __FLEX_LEXER_H
54:
1.7 ! tedu 55: #include <iostream>
! 56: # ifndef FLEX_STD
! 57: # define FLEX_STD std::
! 58: # endif
1.6 espie 59:
1.1 deraadt 60: extern "C++" {
1.7 ! tedu 61:
1.1 deraadt 62: struct yy_buffer_state;
63: typedef int yy_state_type;
64:
65: class FlexLexer {
66: public:
67: virtual ~FlexLexer() { }
68:
1.7 ! tedu 69: const char* YYText() const { return yytext; }
! 70: int YYLeng() const { return yyleng; }
1.1 deraadt 71:
72: virtual void
73: yy_switch_to_buffer( struct yy_buffer_state* new_buffer ) = 0;
74: virtual struct yy_buffer_state*
1.7 ! tedu 75: yy_create_buffer( FLEX_STD istream* s, int size ) = 0;
1.1 deraadt 76: virtual void yy_delete_buffer( struct yy_buffer_state* b ) = 0;
1.7 ! tedu 77: virtual void yyrestart( FLEX_STD istream* s ) = 0;
1.1 deraadt 78:
79: virtual int yylex() = 0;
80:
81: // Call yylex with new input/output sources.
1.7 ! tedu 82: int yylex( FLEX_STD istream* new_in, FLEX_STD ostream* new_out = 0 )
1.1 deraadt 83: {
84: switch_streams( new_in, new_out );
85: return yylex();
86: }
87:
88: // Switch to new input/output streams. A nil stream pointer
89: // indicates "keep the current one".
1.7 ! tedu 90: virtual void switch_streams( FLEX_STD istream* new_in = 0,
! 91: FLEX_STD ostream* new_out = 0 ) = 0;
1.1 deraadt 92:
93: int lineno() const { return yylineno; }
94:
95: int debug() const { return yy_flex_debug; }
96: void set_debug( int flag ) { yy_flex_debug = flag; }
97:
98: protected:
99: char* yytext;
100: int yyleng;
101: int yylineno; // only maintained if you use %option yylineno
102: int yy_flex_debug; // only has effect with -d or "%option debug"
103: };
104:
105: }
1.7 ! tedu 106: #endif // FLEXLEXER_H
1.1 deraadt 107:
108: #if defined(yyFlexLexer) || ! defined(yyFlexLexerOnce)
109: // Either this is the first time through (yyFlexLexerOnce not defined),
110: // or this is a repeated include to define a different flavor of
1.7 ! tedu 111: // yyFlexLexer, as discussed in the flex manual.
1.1 deraadt 112: #define yyFlexLexerOnce
113:
1.7 ! tedu 114: extern "C++" {
! 115:
1.1 deraadt 116: class yyFlexLexer : public FlexLexer {
117: public:
118: // arg_yyin and arg_yyout default to the cin and cout, but we
119: // only make that assignment when initializing in yylex().
1.7 ! tedu 120: yyFlexLexer( FLEX_STD istream* arg_yyin = 0, FLEX_STD ostream* arg_yyout = 0 );
1.1 deraadt 121:
122: virtual ~yyFlexLexer();
123:
124: void yy_switch_to_buffer( struct yy_buffer_state* new_buffer );
1.7 ! tedu 125: struct yy_buffer_state* yy_create_buffer( FLEX_STD istream* s, int size );
1.1 deraadt 126: void yy_delete_buffer( struct yy_buffer_state* b );
1.7 ! tedu 127: void yyrestart( FLEX_STD istream* s );
! 128:
! 129: void yypush_buffer_state( struct yy_buffer_state* new_buffer );
! 130: void yypop_buffer_state();
1.1 deraadt 131:
132: virtual int yylex();
1.7 ! tedu 133: virtual void switch_streams( FLEX_STD istream* new_in, FLEX_STD ostream* new_out = 0 );
! 134: virtual int yywrap();
1.1 deraadt 135:
136: protected:
137: virtual int LexerInput( char* buf, int max_size );
138: virtual void LexerOutput( const char* buf, int size );
139: virtual void LexerError( const char* msg );
140:
141: void yyunput( int c, char* buf_ptr );
142: int yyinput();
143:
144: void yy_load_buffer_state();
1.7 ! tedu 145: void yy_init_buffer( struct yy_buffer_state* b, FLEX_STD istream* s );
1.1 deraadt 146: void yy_flush_buffer( struct yy_buffer_state* b );
147:
148: int yy_start_stack_ptr;
149: int yy_start_stack_depth;
150: int* yy_start_stack;
151:
152: void yy_push_state( int new_state );
153: void yy_pop_state();
154: int yy_top_state();
155:
156: yy_state_type yy_get_previous_state();
157: yy_state_type yy_try_NUL_trans( yy_state_type current_state );
158: int yy_get_next_buffer();
159:
1.7 ! tedu 160: FLEX_STD istream* yyin; // input source for default LexerInput
! 161: FLEX_STD ostream* yyout; // output sink for default LexerOutput
1.1 deraadt 162:
163: // yy_hold_char holds the character lost when yytext is formed.
164: char yy_hold_char;
165:
166: // Number of characters read into yy_ch_buf.
167: int yy_n_chars;
168:
169: // Points to current character in buffer.
170: char* yy_c_buf_p;
171:
172: int yy_init; // whether we need to initialize
173: int yy_start; // start state number
174:
175: // Flag which is used to allow yywrap()'s to do buffer switches
176: // instead of setting up a fresh yyin. A bit of a hack ...
177: int yy_did_buffer_switch_on_eof;
178:
1.7 ! tedu 179:
! 180: size_t yy_buffer_stack_top; /**< index of top of stack. */
! 181: size_t yy_buffer_stack_max; /**< capacity of stack. */
! 182: struct yy_buffer_state ** yy_buffer_stack; /**< Stack as an array. */
! 183: void yyensure_buffer_stack(void);
! 184:
1.1 deraadt 185: // The following are not always needed, but may be depending
186: // on use of certain flex features (like REJECT or yymore()).
187:
188: yy_state_type yy_last_accepting_state;
189: char* yy_last_accepting_cpos;
190:
191: yy_state_type* yy_state_buf;
192: yy_state_type* yy_state_ptr;
193:
194: char* yy_full_match;
195: int* yy_full_state;
196: int yy_full_lp;
197:
198: int yy_lp;
199: int yy_looking_for_trail_begin;
200:
201: int yy_more_flag;
202: int yy_more_len;
1.3 millert 203: int yy_more_offset;
204: int yy_prev_more_offset;
1.1 deraadt 205: };
206:
1.7 ! tedu 207: }
! 208:
! 209: #endif // yyFlexLexer || ! yyFlexLexerOnce
! 210:
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