/[pcre]/code/trunk/internal.h
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Contents of /code/trunk/internal.h

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Revision 7 - (hide annotations) (download)
Sat Feb 24 21:38:09 2007 UTC (7 years, 6 months ago) by nigel
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Load pcre-1.02 into code/trunk.

1 nigel 3 /*************************************************
2     * Perl-Compatible Regular Expressions *
3     *************************************************/
4    
5    
6 nigel 7 #define PCRE_VERSION "1.02 12-Dec-1997"
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     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 nigel 7 OP_EOD must correspond in order to the list of escapes immediately above. */
112 nigel 3
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 nigel 7 OP_EOD, /* End of data: \Z. */
129 nigel 3
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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