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Diffstat (limited to 'internal.h')
| -rw-r--r-- | internal.h | 281 |
1 files changed, 281 insertions, 0 deletions
diff --git a/internal.h b/internal.h new file mode 100644 index 0000000..1ba868d --- /dev/null +++ b/internal.h @@ -0,0 +1,281 @@ +/************************************************* +* Perl-Compatible Regular Expressions * +*************************************************/ + + +#define PCRE_VERSION "1.00 18-Nov-1997" + + +/* This is a library of functions to support regular expressions whose syntax +and semantics are as close as possible to those of the Perl 5 language. See +the file Tech.Notes for some information on the internals. + +Written by: Philip Hazel <ph10@cam.ac.uk> + + Copyright (c) 1997 University of Cambridge + +----------------------------------------------------------------------------- +Permission is granted to anyone to use this software for any purpose on any +computer system, and to redistribute it freely, subject to the following +restrictions: + +1. This software is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. + +2. The origin of this software must not be misrepresented, either by + explicit claim or by omission. + +3. Altered versions must be plainly marked as such, and must not be + misrepresented as being the original software. +----------------------------------------------------------------------------- +*/ + +/* This header contains definitions that are shared between the different +modules, but which are not relevant to the outside. */ + +/* To cope with SunOS4 and other systems that lack memmove() but have bcopy(), +define a macro for memmove() if USE_BCOPY is defined. */ + +#ifdef USE_BCOPY +#define memmove(a, b, c) bcopy(b, a, c) +#endif + +/* Standard C headers plus the external interface definition */ + +#include <ctype.h> +#include <limits.h> +#include <setjmp.h> +#include <stddef.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include "pcre.h" + +/* Private options flags start at the most significant end of the two bytes. +The public options defined in pcre.h start at the least significant end. Make +sure they don't overlap! */ + +#define PCRE_FIRSTSET 0x8000 /* first_char is set */ +#define PCRE_STARTLINE 0x4000 /* start after \n for multiline */ +#define PCRE_COMPILED_CASELESS 0x2000 /* like it says */ + +/* Options for the "extra" block produced by pcre_study(). */ + +#define PCRE_STUDY_CASELESS 0x01 /* study was caseless */ +#define PCRE_STUDY_MAPPED 0x02 /* a map of starting chars exists */ + +/* Masks for identifying the public options: all permitted at compile time, +only some permitted at run or study time. */ + +#define PUBLIC_OPTIONS \ + (PCRE_CASELESS|PCRE_EXTENDED|PCRE_ANCHORED|PCRE_MULTILINE| \ + PCRE_DOTALL|PCRE_DOLLAR_ENDONLY|PCRE_EXTRA) + +#define PUBLIC_EXEC_OPTIONS \ + (PCRE_CASELESS|PCRE_ANCHORED|PCRE_MULTILINE|PCRE_NOTBOL|PCRE_NOTEOL| \ + PCRE_DOTALL|PCRE_DOLLAR_ENDONLY) + +#define PUBLIC_STUDY_OPTIONS (PCRE_CASELESS) + +/* Magic number to provide a small check against being handed junk. */ + +#define MAGIC_NUMBER 0x50435245 /* 'PCRE' */ + +/* Miscellaneous definitions */ + +typedef int BOOL; + +#define FALSE 0 +#define TRUE 1 + +/* These are escaped items that aren't just an encoding of a particular data +value such as \n. They must have non-zero values, as check_escape() returns +their negation. Also, they must appear in the same order as in the opcode +definitions below, up to ESC_Z. The final one must be ESC_REF as subsequent +values are used for \1, \2, \3, etc. There is a test in the code for an escape +greater than ESC_b and less than ESC_X to detect the types that may be +repeated. If any new escapes are put in-between that don't consume a character, +that code will have to change. */ + +enum { ESC_A = 1, ESC_B, ESC_b, ESC_D, ESC_d, ESC_S, ESC_s, ESC_W, ESC_w, + + /* These are not Perl escapes, so can't appear in the */ + ESC_X, /* simple table-lookup because they must be conditional */ + /* on PCRE_EXTRA. */ + ESC_Z, + ESC_REF }; + +/* Opcode table: OP_BRA must be last, as all values >= it are used for brackets +that extract substrings. Starting from 1 (i.e. after OP_END), the values up to +OP_EOL must correspond in order to the list of escapes immediately above. */ + +enum { + OP_END, /* End of pattern */ + + /* Values corresponding to backslashed metacharacters */ + + OP_SOD, /* Start of data: \A */ + OP_NOT_WORD_BOUNDARY, /* \B */ + OP_WORD_BOUNDARY, /* \b */ + OP_NOT_DIGIT, /* \D */ + OP_DIGIT, /* \d */ + OP_NOT_WHITESPACE, /* \S */ + OP_WHITESPACE, /* \s */ + OP_NOT_WORDCHAR, /* \W */ + OP_WORDCHAR, /* \w */ + OP_CUT, /* The analogue of Prolog's "cut" operation (extension) */ + OP_EOD, /* End of data: or \Z. This must always be the last + of the backslashed meta values. */ + + OP_CIRC, /* Start of line - varies with multiline switch */ + OP_DOLL, /* End of line - varies with multiline switch */ + OP_ANY, /* Match any character */ + OP_CHARS, /* Match string of characters */ + OP_NOT, /* Match anything but the following char */ + + OP_STAR, /* The maximizing and minimizing versions of */ + OP_MINSTAR, /* all these opcodes must come in pairs, with */ + OP_PLUS, /* the minimizing one second. */ + OP_MINPLUS, /* This first set applies to single characters */ + OP_QUERY, + OP_MINQUERY, + OP_UPTO, /* From 0 to n matches */ + OP_MINUPTO, + OP_EXACT, /* Exactly n matches */ + + OP_NOTSTAR, /* The maximizing and minimizing versions of */ + OP_NOTMINSTAR, /* all these opcodes must come in pairs, with */ + OP_NOTPLUS, /* the minimizing one second. */ + OP_NOTMINPLUS, /* This first set applies to "not" single characters */ + OP_NOTQUERY, + OP_NOTMINQUERY, + OP_NOTUPTO, /* From 0 to n matches */ + OP_NOTMINUPTO, + OP_NOTEXACT, /* Exactly n matches */ + + OP_TYPESTAR, /* The maximizing and minimizing versions of */ + OP_TYPEMINSTAR, /* all these opcodes must come in pairs, with */ + OP_TYPEPLUS, /* the minimizing one second. These codes must */ + OP_TYPEMINPLUS, /* be in exactly the same order as those above. */ + OP_TYPEQUERY, /* This set applies to character types such as \d */ + OP_TYPEMINQUERY, + OP_TYPEUPTO, /* From 0 to n matches */ + OP_TYPEMINUPTO, + OP_TYPEEXACT, /* Exactly n matches */ + + OP_CRSTAR, /* The maximizing and minimizing versions of */ + OP_CRMINSTAR, /* all these opcodes must come in pairs, with */ + OP_CRPLUS, /* the minimizing one second. These codes must */ + OP_CRMINPLUS, /* be in exactly the same order as those above. */ + OP_CRQUERY, /* These are for character classes and back refs */ + OP_CRMINQUERY, + OP_CRRANGE, /* These are different to the three seta above. */ + OP_CRMINRANGE, + + OP_CLASS, /* Match a character class */ + OP_REF, /* Match a back reference */ + + OP_ALT, /* Start of alternation */ + OP_KET, /* End of group that doesn't have an unbounded repeat */ + OP_KETRMAX, /* These two must remain together and in this */ + OP_KETRMIN, /* order. They are for groups the repeat for ever. */ + + OP_ASSERT, + OP_ASSERT_NOT, + OP_ONCE, /* Once matched, don't back up into the subpattern */ + + OP_BRAZERO, /* These two must remain together and in this */ + OP_BRAMINZERO, /* order. */ + + OP_BRA /* This and greater values are used for brackets that + extract substrings. */ +}; + +/* The highest extraction number. This is limited by the number of opcodes +left after OP_BRA, i.e. 255 - OP_BRA. We actually set it somewhat lower. */ + +#define EXTRACT_MAX 99 + +/* The texts of compile-time error messages are defined as macros here so that +they can be accessed by the POSIX wrapper and converted into error codes. Yes, +I could have used error codes in the first place, but didn't feel like changing +just to accommodate the POSIX wrapper. */ + +#define ERR1 "\\ at end of pattern" +#define ERR2 "\\c at end of pattern" +#define ERR3 "unrecognized character follows \\" +#define ERR4 "numbers out of order in {} quantifier" +#define ERR5 "number too big in {} quantifier" +#define ERR6 "missing terminating ] for character class" +#define ERR7 "invalid escape sequence in character class" +#define ERR8 "range out of order in character class" +#define ERR9 "nothing to repeat" +#define ERR10 "operand of unlimited repeat could match the empty string" +#define ERR11 "internal error: unexpected repeat" +#define ERR12 "unrecognized character after (?" +#define ERR13 "too many capturing parenthesized sub-patterns" +#define ERR14 "missing )" +#define ERR15 "back reference to non-existent subpattern" +#define ERR16 "erroffset passed as NULL" +#define ERR17 "unknown option bit(s) set" +#define ERR18 "missing ) after comment" +#define ERR19 "too many sets of parentheses" +#define ERR20 "regular expression too large" +#define ERR21 "failed to get memory" +#define ERR22 "unmatched brackets" +#define ERR23 "internal error: code overflow" + +/* All character handling must be done as unsigned characters. Otherwise there +are problems with top-bit-set characters and functions such as isspace(). +However, we leave the interface to the outside world as char *, because that +should make things easier for callers. We define a short type for unsigned char +to save lots of typing. I tried "uchar", but it causes problems on Digital +Unix, where it is defined in sys/types, so use "uschar" instead. */ + +typedef unsigned char uschar; + +/* The real format of the start of the pcre block; the actual code vector +runs on as long as necessary after the end. */ + +typedef struct real_pcre { + unsigned int magic_number; + unsigned short int options; + unsigned char top_bracket; + unsigned char top_backref; + unsigned char first_char; + unsigned char code[1]; +} real_pcre; + +/* The real format of the extra block returned by pcre_study(). */ + +typedef struct real_pcre_extra { + unsigned char options; + unsigned char start_bits[32]; +} real_pcre_extra; + +/* Global tables from chartables.c */ + +extern uschar pcre_lcc[]; +extern uschar pcre_fcc[]; +extern uschar pcre_cbits[]; +extern uschar pcre_ctypes[]; + +/* Bit definitions for entries in pcre_ctypes[]. */ + +#define ctype_space 0x01 +#define ctype_letter 0x02 +#define ctype_digit 0x04 +#define ctype_xdigit 0x08 +#define ctype_word 0x10 /* alphameric or '_' */ +#define ctype_meta 0x80 /* regexp meta char or zero (end pattern) */ + +/* Offsets for the bitmap tables */ + +#define cbit_digit 0 +#define cbit_letter 32 +#define cbit_word 64 +#define cbit_space 96 +#define cbit_length 128 /* Length of the cbits table */ + +/* End of internal.h */ |