/[pcre]/code/tags/pcre-1.02/internal.h
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Contents of /code/tags/pcre-1.02/internal.h

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Tag code/trunk as code/tags/pcre-1.02.

1 /*************************************************
2 * Perl-Compatible Regular Expressions *
3 *************************************************/
4
5
6 #define PCRE_VERSION "1.02 12-Dec-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_EOD 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: \Z. */
129
130 OP_CIRC, /* Start of line - varies with multiline switch */
131 OP_DOLL, /* End of line - varies with multiline switch */
132 OP_ANY, /* Match any character */
133 OP_CHARS, /* Match string of characters */
134 OP_NOT, /* Match anything but the following char */
135
136 OP_STAR, /* The maximizing and minimizing versions of */
137 OP_MINSTAR, /* all these opcodes must come in pairs, with */
138 OP_PLUS, /* the minimizing one second. */
139 OP_MINPLUS, /* This first set applies to single characters */
140 OP_QUERY,
141 OP_MINQUERY,
142 OP_UPTO, /* From 0 to n matches */
143 OP_MINUPTO,
144 OP_EXACT, /* Exactly n matches */
145
146 OP_NOTSTAR, /* The maximizing and minimizing versions of */
147 OP_NOTMINSTAR, /* all these opcodes must come in pairs, with */
148 OP_NOTPLUS, /* the minimizing one second. */
149 OP_NOTMINPLUS, /* This first set applies to "not" single characters */
150 OP_NOTQUERY,
151 OP_NOTMINQUERY,
152 OP_NOTUPTO, /* From 0 to n matches */
153 OP_NOTMINUPTO,
154 OP_NOTEXACT, /* Exactly n matches */
155
156 OP_TYPESTAR, /* The maximizing and minimizing versions of */
157 OP_TYPEMINSTAR, /* all these opcodes must come in pairs, with */
158 OP_TYPEPLUS, /* the minimizing one second. These codes must */
159 OP_TYPEMINPLUS, /* be in exactly the same order as those above. */
160 OP_TYPEQUERY, /* This set applies to character types such as \d */
161 OP_TYPEMINQUERY,
162 OP_TYPEUPTO, /* From 0 to n matches */
163 OP_TYPEMINUPTO,
164 OP_TYPEEXACT, /* Exactly n matches */
165
166 OP_CRSTAR, /* The maximizing and minimizing versions of */
167 OP_CRMINSTAR, /* all these opcodes must come in pairs, with */
168 OP_CRPLUS, /* the minimizing one second. These codes must */
169 OP_CRMINPLUS, /* be in exactly the same order as those above. */
170 OP_CRQUERY, /* These are for character classes and back refs */
171 OP_CRMINQUERY,
172 OP_CRRANGE, /* These are different to the three seta above. */
173 OP_CRMINRANGE,
174
175 OP_CLASS, /* Match a character class */
176 OP_REF, /* Match a back reference */
177
178 OP_ALT, /* Start of alternation */
179 OP_KET, /* End of group that doesn't have an unbounded repeat */
180 OP_KETRMAX, /* These two must remain together and in this */
181 OP_KETRMIN, /* order. They are for groups the repeat for ever. */
182
183 OP_ASSERT,
184 OP_ASSERT_NOT,
185 OP_ONCE, /* Once matched, don't back up into the subpattern */
186
187 OP_BRAZERO, /* These two must remain together and in this */
188 OP_BRAMINZERO, /* order. */
189
190 OP_BRA /* This and greater values are used for brackets that
191 extract substrings. */
192 };
193
194 /* The highest extraction number. This is limited by the number of opcodes
195 left after OP_BRA, i.e. 255 - OP_BRA. We actually set it somewhat lower. */
196
197 #define EXTRACT_MAX 99
198
199 /* The texts of compile-time error messages are defined as macros here so that
200 they can be accessed by the POSIX wrapper and converted into error codes. Yes,
201 I could have used error codes in the first place, but didn't feel like changing
202 just to accommodate the POSIX wrapper. */
203
204 #define ERR1 "\\ at end of pattern"
205 #define ERR2 "\\c at end of pattern"
206 #define ERR3 "unrecognized character follows \\"
207 #define ERR4 "numbers out of order in {} quantifier"
208 #define ERR5 "number too big in {} quantifier"
209 #define ERR6 "missing terminating ] for character class"
210 #define ERR7 "invalid escape sequence in character class"
211 #define ERR8 "range out of order in character class"
212 #define ERR9 "nothing to repeat"
213 #define ERR10 "operand of unlimited repeat could match the empty string"
214 #define ERR11 "internal error: unexpected repeat"
215 #define ERR12 "unrecognized character after (?"
216 #define ERR13 "too many capturing parenthesized sub-patterns"
217 #define ERR14 "missing )"
218 #define ERR15 "back reference to non-existent subpattern"
219 #define ERR16 "erroffset passed as NULL"
220 #define ERR17 "unknown option bit(s) set"
221 #define ERR18 "missing ) after comment"
222 #define ERR19 "too many sets of parentheses"
223 #define ERR20 "regular expression too large"
224 #define ERR21 "failed to get memory"
225 #define ERR22 "unmatched brackets"
226 #define ERR23 "internal error: code overflow"
227
228 /* All character handling must be done as unsigned characters. Otherwise there
229 are problems with top-bit-set characters and functions such as isspace().
230 However, we leave the interface to the outside world as char *, because that
231 should make things easier for callers. We define a short type for unsigned char
232 to save lots of typing. I tried "uchar", but it causes problems on Digital
233 Unix, where it is defined in sys/types, so use "uschar" instead. */
234
235 typedef unsigned char uschar;
236
237 /* The real format of the start of the pcre block; the actual code vector
238 runs on as long as necessary after the end. */
239
240 typedef struct real_pcre {
241 unsigned int magic_number;
242 unsigned short int options;
243 unsigned char top_bracket;
244 unsigned char top_backref;
245 unsigned char first_char;
246 unsigned char code[1];
247 } real_pcre;
248
249 /* The real format of the extra block returned by pcre_study(). */
250
251 typedef struct real_pcre_extra {
252 unsigned char options;
253 unsigned char start_bits[32];
254 } real_pcre_extra;
255
256 /* Global tables from chartables.c */
257
258 extern uschar pcre_lcc[];
259 extern uschar pcre_fcc[];
260 extern uschar pcre_cbits[];
261 extern uschar pcre_ctypes[];
262
263 /* Bit definitions for entries in pcre_ctypes[]. */
264
265 #define ctype_space 0x01
266 #define ctype_letter 0x02
267 #define ctype_digit 0x04
268 #define ctype_xdigit 0x08
269 #define ctype_word 0x10 /* alphameric or '_' */
270 #define ctype_meta 0x80 /* regexp meta char or zero (end pattern) */
271
272 /* Offsets for the bitmap tables */
273
274 #define cbit_digit 0
275 #define cbit_letter 32
276 #define cbit_word 64
277 #define cbit_space 96
278 #define cbit_length 128 /* Length of the cbits table */
279
280 /* End of internal.h */

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