/[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 nigel 3 /*************************************************
2     * Perl-Compatible Regular Expressions *
3     *************************************************/
4    
5    
6 nigel 5 #define PCRE_VERSION "1.01 19-Nov-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     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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