/[pcre]/code/tags/pcre-1.01/internal.h
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Contents of /code/tags/pcre-1.01/internal.h

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Tag code/trunk as code/tags/pcre-1.01.

1 /*************************************************
2 * Perl-Compatible Regular Expressions *
3 *************************************************/
4
5
6 #define PCRE_VERSION "1.01 19-Nov-1997"
7
8
9 /* This is a library of functions to support regular expressions whose syntax
10 and semantics are as close as possible to those of the Perl 5 language. See
11 the file Tech.Notes for some information on the internals.
12
13 Written by: Philip Hazel <ph10@cam.ac.uk>
14
15 Copyright (c) 1997 University of Cambridge
16
17 -----------------------------------------------------------------------------
18 Permission is granted to anyone to use this software for any purpose on any
19 computer system, and to redistribute it freely, subject to the following
20 restrictions:
21
22 1. This software is distributed in the hope that it will be useful,
23 but WITHOUT ANY WARRANTY; without even the implied warranty of
24 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
25
26 2. The origin of this software must not be misrepresented, either by
27 explicit claim or by omission.
28
29 3. Altered versions must be plainly marked as such, and must not be
30 misrepresented as being the original software.
31 -----------------------------------------------------------------------------
32 */
33
34 /* This header contains definitions that are shared between the different
35 modules, but which are not relevant to the outside. */
36
37 /* To cope with SunOS4 and other systems that lack memmove() but have bcopy(),
38 define a macro for memmove() if USE_BCOPY is defined. */
39
40 #ifdef USE_BCOPY
41 #define memmove(a, b, c) bcopy(b, a, c)
42 #endif
43
44 /* Standard C headers plus the external interface definition */
45
46 #include <ctype.h>
47 #include <limits.h>
48 #include <setjmp.h>
49 #include <stddef.h>
50 #include <stdio.h>
51 #include <stdlib.h>
52 #include <string.h>
53 #include "pcre.h"
54
55 /* Private options flags start at the most significant end of the two bytes.
56 The public options defined in pcre.h start at the least significant end. Make
57 sure they don't overlap! */
58
59 #define PCRE_FIRSTSET 0x8000 /* first_char is set */
60 #define PCRE_STARTLINE 0x4000 /* start after \n for multiline */
61 #define PCRE_COMPILED_CASELESS 0x2000 /* like it says */
62
63 /* Options for the "extra" block produced by pcre_study(). */
64
65 #define PCRE_STUDY_CASELESS 0x01 /* study was caseless */
66 #define PCRE_STUDY_MAPPED 0x02 /* a map of starting chars exists */
67
68 /* Masks for identifying the public options: all permitted at compile time,
69 only some permitted at run or study time. */
70
71 #define PUBLIC_OPTIONS \
72 (PCRE_CASELESS|PCRE_EXTENDED|PCRE_ANCHORED|PCRE_MULTILINE| \
73 PCRE_DOTALL|PCRE_DOLLAR_ENDONLY|PCRE_EXTRA)
74
75 #define PUBLIC_EXEC_OPTIONS \
76 (PCRE_CASELESS|PCRE_ANCHORED|PCRE_MULTILINE|PCRE_NOTBOL|PCRE_NOTEOL| \
77 PCRE_DOTALL|PCRE_DOLLAR_ENDONLY)
78
79 #define PUBLIC_STUDY_OPTIONS (PCRE_CASELESS)
80
81 /* Magic number to provide a small check against being handed junk. */
82
83 #define MAGIC_NUMBER 0x50435245 /* 'PCRE' */
84
85 /* Miscellaneous definitions */
86
87 typedef int BOOL;
88
89 #define FALSE 0
90 #define TRUE 1
91
92 /* These are escaped items that aren't just an encoding of a particular data
93 value such as \n. They must have non-zero values, as check_escape() returns
94 their negation. Also, they must appear in the same order as in the opcode
95 definitions below, up to ESC_Z. The final one must be ESC_REF as subsequent
96 values are used for \1, \2, \3, etc. There is a test in the code for an escape
97 greater than ESC_b and less than ESC_X to detect the types that may be
98 repeated. If any new escapes are put in-between that don't consume a character,
99 that code will have to change. */
100
101 enum { ESC_A = 1, ESC_B, ESC_b, ESC_D, ESC_d, ESC_S, ESC_s, ESC_W, ESC_w,
102
103 /* These are not Perl escapes, so can't appear in the */
104 ESC_X, /* simple table-lookup because they must be conditional */
105 /* on PCRE_EXTRA. */
106 ESC_Z,
107 ESC_REF };
108
109 /* Opcode table: OP_BRA must be last, as all values >= it are used for brackets
110 that extract substrings. Starting from 1 (i.e. after OP_END), the values up to
111 OP_EOL must correspond in order to the list of escapes immediately above. */
112
113 enum {
114 OP_END, /* End of pattern */
115
116 /* Values corresponding to backslashed metacharacters */
117
118 OP_SOD, /* Start of data: \A */
119 OP_NOT_WORD_BOUNDARY, /* \B */
120 OP_WORD_BOUNDARY, /* \b */
121 OP_NOT_DIGIT, /* \D */
122 OP_DIGIT, /* \d */
123 OP_NOT_WHITESPACE, /* \S */
124 OP_WHITESPACE, /* \s */
125 OP_NOT_WORDCHAR, /* \W */
126 OP_WORDCHAR, /* \w */
127 OP_CUT, /* The analogue of Prolog's "cut" operation (extension) */
128 OP_EOD, /* End of data: or \Z. This must always be the last
129 of the backslashed meta values. */
130
131 OP_CIRC, /* Start of line - varies with multiline switch */
132 OP_DOLL, /* End of line - varies with multiline switch */
133 OP_ANY, /* Match any character */
134 OP_CHARS, /* Match string of characters */
135 OP_NOT, /* Match anything but the following char */
136
137 OP_STAR, /* The maximizing and minimizing versions of */
138 OP_MINSTAR, /* all these opcodes must come in pairs, with */
139 OP_PLUS, /* the minimizing one second. */
140 OP_MINPLUS, /* This first set applies to single characters */
141 OP_QUERY,
142 OP_MINQUERY,
143 OP_UPTO, /* From 0 to n matches */
144 OP_MINUPTO,
145 OP_EXACT, /* Exactly n matches */
146
147 OP_NOTSTAR, /* The maximizing and minimizing versions of */
148 OP_NOTMINSTAR, /* all these opcodes must come in pairs, with */
149 OP_NOTPLUS, /* the minimizing one second. */
150 OP_NOTMINPLUS, /* This first set applies to "not" single characters */
151 OP_NOTQUERY,
152 OP_NOTMINQUERY,
153 OP_NOTUPTO, /* From 0 to n matches */
154 OP_NOTMINUPTO,
155 OP_NOTEXACT, /* Exactly n matches */
156
157 OP_TYPESTAR, /* The maximizing and minimizing versions of */
158 OP_TYPEMINSTAR, /* all these opcodes must come in pairs, with */
159 OP_TYPEPLUS, /* the minimizing one second. These codes must */
160 OP_TYPEMINPLUS, /* be in exactly the same order as those above. */
161 OP_TYPEQUERY, /* This set applies to character types such as \d */
162 OP_TYPEMINQUERY,
163 OP_TYPEUPTO, /* From 0 to n matches */
164 OP_TYPEMINUPTO,
165 OP_TYPEEXACT, /* Exactly n matches */
166
167 OP_CRSTAR, /* The maximizing and minimizing versions of */
168 OP_CRMINSTAR, /* all these opcodes must come in pairs, with */
169 OP_CRPLUS, /* the minimizing one second. These codes must */
170 OP_CRMINPLUS, /* be in exactly the same order as those above. */
171 OP_CRQUERY, /* These are for character classes and back refs */
172 OP_CRMINQUERY,
173 OP_CRRANGE, /* These are different to the three seta above. */
174 OP_CRMINRANGE,
175
176 OP_CLASS, /* Match a character class */
177 OP_REF, /* Match a back reference */
178
179 OP_ALT, /* Start of alternation */
180 OP_KET, /* End of group that doesn't have an unbounded repeat */
181 OP_KETRMAX, /* These two must remain together and in this */
182 OP_KETRMIN, /* order. They are for groups the repeat for ever. */
183
184 OP_ASSERT,
185 OP_ASSERT_NOT,
186 OP_ONCE, /* Once matched, don't back up into the subpattern */
187
188 OP_BRAZERO, /* These two must remain together and in this */
189 OP_BRAMINZERO, /* order. */
190
191 OP_BRA /* This and greater values are used for brackets that
192 extract substrings. */
193 };
194
195 /* The highest extraction number. This is limited by the number of opcodes
196 left after OP_BRA, i.e. 255 - OP_BRA. We actually set it somewhat lower. */
197
198 #define EXTRACT_MAX 99
199
200 /* The texts of compile-time error messages are defined as macros here so that
201 they can be accessed by the POSIX wrapper and converted into error codes. Yes,
202 I could have used error codes in the first place, but didn't feel like changing
203 just to accommodate the POSIX wrapper. */
204
205 #define ERR1 "\\ at end of pattern"
206 #define ERR2 "\\c at end of pattern"
207 #define ERR3 "unrecognized character follows \\"
208 #define ERR4 "numbers out of order in {} quantifier"
209 #define ERR5 "number too big in {} quantifier"
210 #define ERR6 "missing terminating ] for character class"
211 #define ERR7 "invalid escape sequence in character class"
212 #define ERR8 "range out of order in character class"
213 #define ERR9 "nothing to repeat"
214 #define ERR10 "operand of unlimited repeat could match the empty string"
215 #define ERR11 "internal error: unexpected repeat"
216 #define ERR12 "unrecognized character after (?"
217 #define ERR13 "too many capturing parenthesized sub-patterns"
218 #define ERR14 "missing )"
219 #define ERR15 "back reference to non-existent subpattern"
220 #define ERR16 "erroffset passed as NULL"
221 #define ERR17 "unknown option bit(s) set"
222 #define ERR18 "missing ) after comment"
223 #define ERR19 "too many sets of parentheses"
224 #define ERR20 "regular expression too large"
225 #define ERR21 "failed to get memory"
226 #define ERR22 "unmatched brackets"
227 #define ERR23 "internal error: code overflow"
228
229 /* All character handling must be done as unsigned characters. Otherwise there
230 are problems with top-bit-set characters and functions such as isspace().
231 However, we leave the interface to the outside world as char *, because that
232 should make things easier for callers. We define a short type for unsigned char
233 to save lots of typing. I tried "uchar", but it causes problems on Digital
234 Unix, where it is defined in sys/types, so use "uschar" instead. */
235
236 typedef unsigned char uschar;
237
238 /* The real format of the start of the pcre block; the actual code vector
239 runs on as long as necessary after the end. */
240
241 typedef struct real_pcre {
242 unsigned int magic_number;
243 unsigned short int options;
244 unsigned char top_bracket;
245 unsigned char top_backref;
246 unsigned char first_char;
247 unsigned char code[1];
248 } real_pcre;
249
250 /* The real format of the extra block returned by pcre_study(). */
251
252 typedef struct real_pcre_extra {
253 unsigned char options;
254 unsigned char start_bits[32];
255 } real_pcre_extra;
256
257 /* Global tables from chartables.c */
258
259 extern uschar pcre_lcc[];
260 extern uschar pcre_fcc[];
261 extern uschar pcre_cbits[];
262 extern uschar pcre_ctypes[];
263
264 /* Bit definitions for entries in pcre_ctypes[]. */
265
266 #define ctype_space 0x01
267 #define ctype_letter 0x02
268 #define ctype_digit 0x04
269 #define ctype_xdigit 0x08
270 #define ctype_word 0x10 /* alphameric or '_' */
271 #define ctype_meta 0x80 /* regexp meta char or zero (end pattern) */
272
273 /* Offsets for the bitmap tables */
274
275 #define cbit_digit 0
276 #define cbit_letter 32
277 #define cbit_word 64
278 #define cbit_space 96
279 #define cbit_length 128 /* Length of the cbits table */
280
281 /* End of internal.h */

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