Annotation of src/usr.bin/lex/FlexLexer.h, Revision 1.1.1.1
1.1 deraadt 1: // $Header: /a/cvsroot/src/usr.bin/lex/FlexLexer.h,v 1.6 1995/05/05 05:35:08 jtc Exp $
2:
3: // FlexLexer.h -- define interfaces for lexical analyzer classes generated
4: // by flex
5:
6: // Copyright (c) 1993 The Regents of the University of California.
7: // All rights reserved.
8: //
9: // This code is derived from software contributed to Berkeley by
10: // Kent Williams and Tom Epperly.
11: //
12: // Redistribution and use in source and binary forms are permitted provided
13: // that: (1) source distributions retain this entire copyright notice and
14: // comment, and (2) distributions including binaries display the following
15: // acknowledgement: ``This product includes software developed by the
16: // University of California, Berkeley and its contributors'' in the
17: // documentation or other materials provided with the distribution and in
18: // all advertising materials mentioning features or use of this software.
19: // Neither the name of the University nor the names of its contributors may
20: // be used to endorse or promote products derived from this software without
21: // specific prior written permission.
22: // THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
23: // WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
24: // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
25:
26: // This file defines FlexLexer, an abstract class which specifies the
27: // external interface provided to flex C++ lexer objects, and yyFlexLexer,
28: // which defines a particular lexer class.
29: //
30: // If you want to create multiple lexer classes, you use the -P flag
31: // to rename each yyFlexLexer to some other xxFlexLexer. You then
32: // include <FlexLexer.h> in your other sources once per lexer class:
33: //
34: // #undef yyFlexLexer
35: // #define yyFlexLexer xxFlexLexer
36: // #include <FlexLexer.h>
37: //
38: // #undef yyFlexLexer
39: // #define yyFlexLexer zzFlexLexer
40: // #include <FlexLexer.h>
41: // ...
42:
43: #ifndef __FLEX_LEXER_H
44: // Never included before - need to define base class.
45: #define __FLEX_LEXER_H
46: #include <iostream.h>
47:
48: extern "C++" {
49:
50: struct yy_buffer_state;
51: typedef int yy_state_type;
52:
53: class FlexLexer {
54: public:
55: virtual ~FlexLexer() { }
56:
57: const char* YYText() { return yytext; }
58: int YYLeng() { return yyleng; }
59:
60: virtual void
61: yy_switch_to_buffer( struct yy_buffer_state* new_buffer ) = 0;
62: virtual struct yy_buffer_state*
63: yy_create_buffer( istream* s, int size ) = 0;
64: virtual void yy_delete_buffer( struct yy_buffer_state* b ) = 0;
65: virtual void yyrestart( istream* s ) = 0;
66:
67: virtual int yylex() = 0;
68:
69: // Call yylex with new input/output sources.
70: int yylex( istream* new_in, ostream* new_out = 0 )
71: {
72: switch_streams( new_in, new_out );
73: return yylex();
74: }
75:
76: // Switch to new input/output streams. A nil stream pointer
77: // indicates "keep the current one".
78: virtual void switch_streams( istream* new_in = 0,
79: ostream* new_out = 0 ) = 0;
80:
81: int lineno() const { return yylineno; }
82:
83: int debug() const { return yy_flex_debug; }
84: void set_debug( int flag ) { yy_flex_debug = flag; }
85:
86: protected:
87: char* yytext;
88: int yyleng;
89: int yylineno; // only maintained if you use %option yylineno
90: int yy_flex_debug; // only has effect with -d or "%option debug"
91: };
92:
93: }
94: #endif
95:
96: #if defined(yyFlexLexer) || ! defined(yyFlexLexerOnce)
97: // Either this is the first time through (yyFlexLexerOnce not defined),
98: // or this is a repeated include to define a different flavor of
99: // yyFlexLexer, as discussed in the flex man page.
100: #define yyFlexLexerOnce
101:
102: class yyFlexLexer : public FlexLexer {
103: public:
104: // arg_yyin and arg_yyout default to the cin and cout, but we
105: // only make that assignment when initializing in yylex().
106: yyFlexLexer( istream* arg_yyin = 0, ostream* arg_yyout = 0 );
107:
108: virtual ~yyFlexLexer();
109:
110: void yy_switch_to_buffer( struct yy_buffer_state* new_buffer );
111: struct yy_buffer_state* yy_create_buffer( istream* s, int size );
112: void yy_delete_buffer( struct yy_buffer_state* b );
113: void yyrestart( istream* s );
114:
115: virtual int yylex();
116: virtual void switch_streams( istream* new_in, ostream* new_out );
117:
118: protected:
119: virtual int LexerInput( char* buf, int max_size );
120: virtual void LexerOutput( const char* buf, int size );
121: virtual void LexerError( const char* msg );
122:
123: void yyunput( int c, char* buf_ptr );
124: int yyinput();
125:
126: void yy_load_buffer_state();
127: void yy_init_buffer( struct yy_buffer_state* b, istream* s );
128: void yy_flush_buffer( struct yy_buffer_state* b );
129:
130: int yy_start_stack_ptr;
131: int yy_start_stack_depth;
132: int* yy_start_stack;
133:
134: void yy_push_state( int new_state );
135: void yy_pop_state();
136: int yy_top_state();
137:
138: yy_state_type yy_get_previous_state();
139: yy_state_type yy_try_NUL_trans( yy_state_type current_state );
140: int yy_get_next_buffer();
141:
142: istream* yyin; // input source for default LexerInput
143: ostream* yyout; // output sink for default LexerOutput
144:
145: struct yy_buffer_state* yy_current_buffer;
146:
147: // yy_hold_char holds the character lost when yytext is formed.
148: char yy_hold_char;
149:
150: // Number of characters read into yy_ch_buf.
151: int yy_n_chars;
152:
153: // Points to current character in buffer.
154: char* yy_c_buf_p;
155:
156: int yy_init; // whether we need to initialize
157: int yy_start; // start state number
158:
159: // Flag which is used to allow yywrap()'s to do buffer switches
160: // instead of setting up a fresh yyin. A bit of a hack ...
161: int yy_did_buffer_switch_on_eof;
162:
163: // The following are not always needed, but may be depending
164: // on use of certain flex features (like REJECT or yymore()).
165:
166: yy_state_type yy_last_accepting_state;
167: char* yy_last_accepting_cpos;
168:
169: yy_state_type* yy_state_buf;
170: yy_state_type* yy_state_ptr;
171:
172: char* yy_full_match;
173: int* yy_full_state;
174: int yy_full_lp;
175:
176: int yy_lp;
177: int yy_looking_for_trail_begin;
178:
179: int yy_more_flag;
180: int yy_more_len;
181: };
182:
183: #endif
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