/[pcre]/code/tags/pcre-3.1/internal.h
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Contents of /code/tags/pcre-3.1/internal.h

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Load pcre-2.02 into code/trunk.

1 nigel 3 /*************************************************
2     * Perl-Compatible Regular Expressions *
3     *************************************************/
4    
5    
6 nigel 27 #define PCRE_VERSION "2.02 14-Jan-1999"
7 nigel 3
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 nigel 27 Copyright (c) 1997-1999 University of Cambridge
16 nigel 3
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 nigel 9 #undef memmove /* some systems may have a macro */
42 nigel 3 #define memmove(a, b, c) bcopy(b, a, c)
43     #endif
44    
45     /* Standard C headers plus the external interface definition */
46    
47     #include <ctype.h>
48     #include <limits.h>
49     #include <stddef.h>
50     #include <stdio.h>
51     #include <stdlib.h>
52     #include <string.h>
53     #include "pcre.h"
54    
55 nigel 9 /* In case there is no definition of offsetof() provided - though any proper
56     Standard C system should have one. */
57    
58     #ifndef offsetof
59 nigel 11 #define offsetof(p_type,field) ((size_t)&(((p_type *)0)->field))
60 nigel 9 #endif
61    
62 nigel 23 /* These are the public options that can change during matching. */
63    
64     #define PCRE_IMS (PCRE_CASELESS|PCRE_MULTILINE|PCRE_DOTALL)
65    
66 nigel 3 /* Private options flags start at the most significant end of the two bytes.
67     The public options defined in pcre.h start at the least significant end. Make
68     sure they don't overlap! */
69    
70     #define PCRE_FIRSTSET 0x8000 /* first_char is set */
71     #define PCRE_STARTLINE 0x4000 /* start after \n for multiline */
72 nigel 23 #define PCRE_INGROUP 0x2000 /* compiling inside a group */
73 nigel 3
74     /* Options for the "extra" block produced by pcre_study(). */
75    
76 nigel 23 #define PCRE_STUDY_MAPPED 0x01 /* a map of starting chars exists */
77 nigel 3
78 nigel 23 /* Masks for identifying the public options which are permitted at compile
79     time, run time or study time, respectively. */
80 nigel 3
81     #define PUBLIC_OPTIONS \
82     (PCRE_CASELESS|PCRE_EXTENDED|PCRE_ANCHORED|PCRE_MULTILINE| \
83 nigel 19 PCRE_DOTALL|PCRE_DOLLAR_ENDONLY|PCRE_EXTRA|PCRE_UNGREEDY)
84 nigel 3
85 nigel 23 #define PUBLIC_EXEC_OPTIONS (PCRE_ANCHORED|PCRE_NOTBOL|PCRE_NOTEOL)
86 nigel 3
87 nigel 23 #define PUBLIC_STUDY_OPTIONS 0 /* None defined */
88 nigel 3
89     /* Magic number to provide a small check against being handed junk. */
90    
91     #define MAGIC_NUMBER 0x50435245 /* 'PCRE' */
92    
93     /* Miscellaneous definitions */
94    
95     typedef int BOOL;
96    
97     #define FALSE 0
98     #define TRUE 1
99    
100     /* These are escaped items that aren't just an encoding of a particular data
101     value such as \n. They must have non-zero values, as check_escape() returns
102     their negation. Also, they must appear in the same order as in the opcode
103 nigel 23 definitions below, up to ESC_z. The final one must be ESC_REF as subsequent
104 nigel 3 values are used for \1, \2, \3, etc. There is a test in the code for an escape
105     greater than ESC_b and less than ESC_X to detect the types that may be
106     repeated. If any new escapes are put in-between that don't consume a character,
107     that code will have to change. */
108    
109     enum { ESC_A = 1, ESC_B, ESC_b, ESC_D, ESC_d, ESC_S, ESC_s, ESC_W, ESC_w,
110 nigel 23 ESC_Z, ESC_z, ESC_REF };
111 nigel 3
112     /* Opcode table: OP_BRA must be last, as all values >= it are used for brackets
113     that extract substrings. Starting from 1 (i.e. after OP_END), the values up to
114 nigel 7 OP_EOD must correspond in order to the list of escapes immediately above. */
115 nigel 3
116     enum {
117     OP_END, /* End of pattern */
118    
119     /* Values corresponding to backslashed metacharacters */
120    
121     OP_SOD, /* Start of data: \A */
122     OP_NOT_WORD_BOUNDARY, /* \B */
123     OP_WORD_BOUNDARY, /* \b */
124     OP_NOT_DIGIT, /* \D */
125     OP_DIGIT, /* \d */
126     OP_NOT_WHITESPACE, /* \S */
127     OP_WHITESPACE, /* \s */
128     OP_NOT_WORDCHAR, /* \W */
129     OP_WORDCHAR, /* \w */
130 nigel 23 OP_EODN, /* End of data or \n at end of data: \Z. */
131     OP_EOD, /* End of data: \z */
132 nigel 3
133 nigel 23 OP_OPT, /* Set runtime options */
134 nigel 3 OP_CIRC, /* Start of line - varies with multiline switch */
135     OP_DOLL, /* End of line - varies with multiline switch */
136     OP_ANY, /* Match any character */
137     OP_CHARS, /* Match string of characters */
138     OP_NOT, /* Match anything but the following char */
139    
140     OP_STAR, /* The maximizing and minimizing versions of */
141     OP_MINSTAR, /* all these opcodes must come in pairs, with */
142     OP_PLUS, /* the minimizing one second. */
143     OP_MINPLUS, /* This first set applies to single characters */
144     OP_QUERY,
145     OP_MINQUERY,
146     OP_UPTO, /* From 0 to n matches */
147     OP_MINUPTO,
148     OP_EXACT, /* Exactly n matches */
149    
150     OP_NOTSTAR, /* The maximizing and minimizing versions of */
151     OP_NOTMINSTAR, /* all these opcodes must come in pairs, with */
152     OP_NOTPLUS, /* the minimizing one second. */
153     OP_NOTMINPLUS, /* This first set applies to "not" single characters */
154     OP_NOTQUERY,
155     OP_NOTMINQUERY,
156     OP_NOTUPTO, /* From 0 to n matches */
157     OP_NOTMINUPTO,
158     OP_NOTEXACT, /* Exactly n matches */
159    
160     OP_TYPESTAR, /* The maximizing and minimizing versions of */
161     OP_TYPEMINSTAR, /* all these opcodes must come in pairs, with */
162     OP_TYPEPLUS, /* the minimizing one second. These codes must */
163     OP_TYPEMINPLUS, /* be in exactly the same order as those above. */
164     OP_TYPEQUERY, /* This set applies to character types such as \d */
165     OP_TYPEMINQUERY,
166     OP_TYPEUPTO, /* From 0 to n matches */
167     OP_TYPEMINUPTO,
168     OP_TYPEEXACT, /* Exactly n matches */
169    
170     OP_CRSTAR, /* The maximizing and minimizing versions of */
171     OP_CRMINSTAR, /* all these opcodes must come in pairs, with */
172     OP_CRPLUS, /* the minimizing one second. These codes must */
173     OP_CRMINPLUS, /* be in exactly the same order as those above. */
174     OP_CRQUERY, /* These are for character classes and back refs */
175     OP_CRMINQUERY,
176     OP_CRRANGE, /* These are different to the three seta above. */
177     OP_CRMINRANGE,
178    
179     OP_CLASS, /* Match a character class */
180     OP_REF, /* Match a back reference */
181    
182     OP_ALT, /* Start of alternation */
183     OP_KET, /* End of group that doesn't have an unbounded repeat */
184     OP_KETRMAX, /* These two must remain together and in this */
185     OP_KETRMIN, /* order. They are for groups the repeat for ever. */
186    
187 nigel 23 /* The assertions must come before ONCE and COND */
188    
189     OP_ASSERT, /* Positive lookahead */
190     OP_ASSERT_NOT, /* Negative lookahead */
191     OP_ASSERTBACK, /* Positive lookbehind */
192     OP_ASSERTBACK_NOT, /* Negative lookbehind */
193     OP_REVERSE, /* Move pointer back - used in lookbehind assertions */
194    
195     /* ONCE and COND must come after the assertions, with ONCE first, as there's
196     a test for >= ONCE for a subpattern that isn't an assertion. */
197    
198 nigel 3 OP_ONCE, /* Once matched, don't back up into the subpattern */
199 nigel 23 OP_COND, /* Conditional group */
200     OP_CREF, /* Used to hold an extraction string number */
201 nigel 3
202     OP_BRAZERO, /* These two must remain together and in this */
203     OP_BRAMINZERO, /* order. */
204    
205     OP_BRA /* This and greater values are used for brackets that
206     extract substrings. */
207     };
208    
209     /* The highest extraction number. This is limited by the number of opcodes
210     left after OP_BRA, i.e. 255 - OP_BRA. We actually set it somewhat lower. */
211    
212     #define EXTRACT_MAX 99
213    
214     /* The texts of compile-time error messages are defined as macros here so that
215     they can be accessed by the POSIX wrapper and converted into error codes. Yes,
216     I could have used error codes in the first place, but didn't feel like changing
217     just to accommodate the POSIX wrapper. */
218    
219     #define ERR1 "\\ at end of pattern"
220     #define ERR2 "\\c at end of pattern"
221     #define ERR3 "unrecognized character follows \\"
222     #define ERR4 "numbers out of order in {} quantifier"
223     #define ERR5 "number too big in {} quantifier"
224     #define ERR6 "missing terminating ] for character class"
225     #define ERR7 "invalid escape sequence in character class"
226     #define ERR8 "range out of order in character class"
227     #define ERR9 "nothing to repeat"
228     #define ERR10 "operand of unlimited repeat could match the empty string"
229     #define ERR11 "internal error: unexpected repeat"
230     #define ERR12 "unrecognized character after (?"
231     #define ERR13 "too many capturing parenthesized sub-patterns"
232     #define ERR14 "missing )"
233     #define ERR15 "back reference to non-existent subpattern"
234     #define ERR16 "erroffset passed as NULL"
235     #define ERR17 "unknown option bit(s) set"
236     #define ERR18 "missing ) after comment"
237     #define ERR19 "too many sets of parentheses"
238     #define ERR20 "regular expression too large"
239     #define ERR21 "failed to get memory"
240 nigel 23 #define ERR22 "unmatched parentheses"
241 nigel 3 #define ERR23 "internal error: code overflow"
242 nigel 23 #define ERR24 "unrecognized character after (?<"
243     #define ERR25 "lookbehind assertion is not fixed length"
244     #define ERR26 "malformed number after (?("
245     #define ERR27 "conditional group contains more than two branches"
246     #define ERR28 "assertion expected after (?("
247 nigel 3
248     /* All character handling must be done as unsigned characters. Otherwise there
249     are problems with top-bit-set characters and functions such as isspace().
250     However, we leave the interface to the outside world as char *, because that
251     should make things easier for callers. We define a short type for unsigned char
252     to save lots of typing. I tried "uchar", but it causes problems on Digital
253     Unix, where it is defined in sys/types, so use "uschar" instead. */
254    
255     typedef unsigned char uschar;
256    
257     /* The real format of the start of the pcre block; the actual code vector
258     runs on as long as necessary after the end. */
259    
260     typedef struct real_pcre {
261     unsigned int magic_number;
262 nigel 25 const unsigned char *tables;
263 nigel 3 unsigned short int options;
264     unsigned char top_bracket;
265     unsigned char top_backref;
266     unsigned char first_char;
267     unsigned char code[1];
268     } real_pcre;
269    
270     /* The real format of the extra block returned by pcre_study(). */
271    
272     typedef struct real_pcre_extra {
273     unsigned char options;
274     unsigned char start_bits[32];
275     } real_pcre_extra;
276    
277    
278 nigel 25 /* Structure for passing "static" information around between the functions
279     doing the compiling, so that they are thread-safe. */
280 nigel 3
281 nigel 25 typedef struct compile_data {
282     const uschar *lcc; /* Points to lower casing table */
283     const uschar *fcc; /* Points to case-flippint table */
284     const uschar *cbits; /* Points to character type table */
285     const uschar *ctypes; /* Points to table of type maps */
286     } compile_data;
287 nigel 3
288 nigel 25 /* Structure for passing "static" information around between the functions
289     doing the matching, so that they are thread-safe. */
290    
291     typedef struct match_data {
292     int errorcode; /* As it says */
293     int *offset_vector; /* Offset vector */
294     int offset_end; /* One past the end */
295     int offset_max; /* The maximum usable for return data */
296     const uschar *lcc; /* Points to lower casing table */
297     const uschar *ctypes; /* Points to table of type maps */
298     BOOL offset_overflow; /* Set if too many extractions */
299     BOOL notbol; /* NOTBOL flag */
300     BOOL noteol; /* NOTEOL flag */
301     BOOL endonly; /* Dollar not before final \n */
302     const uschar *start_subject; /* Start of the subject string */
303     const uschar *end_subject; /* End of the subject string */
304     const uschar *end_match_ptr; /* Subject position at end match */
305     int end_offset_top; /* Highwater mark at end of match */
306     } match_data;
307    
308     /* Bit definitions for entries in the pcre_ctypes table. */
309    
310 nigel 3 #define ctype_space 0x01
311     #define ctype_letter 0x02
312     #define ctype_digit 0x04
313     #define ctype_xdigit 0x08
314     #define ctype_word 0x10 /* alphameric or '_' */
315     #define ctype_meta 0x80 /* regexp meta char or zero (end pattern) */
316    
317 nigel 25 /* Offsets for the bitmap tables in pcre_cbits. Each table contains a set
318     of bits for a class map. */
319 nigel 3
320 nigel 25 #define cbit_digit 0 /* for \d */
321     #define cbit_word 32 /* for \w */
322     #define cbit_space 64 /* for \s */
323     #define cbit_length 96 /* Length of the cbits table */
324 nigel 3
325 nigel 25 /* Offsets of the various tables from the base tables pointer, and
326     total length. */
327    
328     #define lcc_offset 0
329     #define fcc_offset 256
330     #define cbits_offset 512
331     #define ctypes_offset (cbits_offset + cbit_length)
332     #define tables_length (ctypes_offset + 256)
333    
334 nigel 3 /* End of internal.h */

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