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regexp.c
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regexp.c
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/* vi:set ts=8 sts=4 sw=4:
*
* Handling of regular expressions: vim_regcomp(), vim_regexec(), vim_regsub()
*
* NOTICE:
*
* This is NOT the original regular expression code as written by Henry
* Spencer. This code has been modified specifically for use with the VIM
* editor, and should not be used separately from Vim. If you want a good
* regular expression library, get the original code. The copyright notice
* that follows is from the original.
*
* END NOTICE
*
* Copyright (c) 1986 by University of Toronto.
* Written by Henry Spencer. Not derived from licensed software.
*
* 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. The author is not responsible for the consequences of use of
* this software, no matter how awful, even if they arise
* from defects in it.
*
* 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.
*
* Beware that some of this code is subtly aware of the way operator
* precedence is structured in regular expressions. Serious changes in
* regular-expression syntax might require a total rethink.
*
* Changes have been made by Tony Andrews, Olaf 'Rhialto' Seibert, Robert
* Webb, Ciaran McCreesh and Bram Moolenaar.
* Named character class support added by Walter Briscoe (1998 Jul 01)
*/
/* Uncomment the first if you do not want to see debugging logs or files
* related to regular expressions, even when compiling with -DDEBUG.
* Uncomment the second to get the regexp debugging. */
/* #undef DEBUG */
/* #define DEBUG */
#include "vim.h"
#ifdef DEBUG
/* show/save debugging data when BT engine is used */
# define BT_REGEXP_DUMP
/* save the debugging data to a file instead of displaying it */
# define BT_REGEXP_LOG
# define BT_REGEXP_DEBUG_LOG
# define BT_REGEXP_DEBUG_LOG_NAME "bt_regexp_debug.log"
#endif
/*
* The "internal use only" fields in regexp.h are present to pass info from
* compile to execute that permits the execute phase to run lots faster on
* simple cases. They are:
*
* regstart char that must begin a match; NUL if none obvious; Can be a
* multi-byte character.
* reganch is the match anchored (at beginning-of-line only)?
* regmust string (pointer into program) that match must include, or NULL
* regmlen length of regmust string
* regflags RF_ values or'ed together
*
* Regstart and reganch permit very fast decisions on suitable starting points
* for a match, cutting down the work a lot. Regmust permits fast rejection
* of lines that cannot possibly match. The regmust tests are costly enough
* that vim_regcomp() supplies a regmust only if the r.e. contains something
* potentially expensive (at present, the only such thing detected is * or +
* at the start of the r.e., which can involve a lot of backup). Regmlen is
* supplied because the test in vim_regexec() needs it and vim_regcomp() is
* computing it anyway.
*/
/*
* Structure for regexp "program". This is essentially a linear encoding
* of a nondeterministic finite-state machine (aka syntax charts or
* "railroad normal form" in parsing technology). Each node is an opcode
* plus a "next" pointer, possibly plus an operand. "Next" pointers of
* all nodes except BRANCH and BRACES_COMPLEX implement concatenation; a "next"
* pointer with a BRANCH on both ends of it is connecting two alternatives.
* (Here we have one of the subtle syntax dependencies: an individual BRANCH
* (as opposed to a collection of them) is never concatenated with anything
* because of operator precedence). The "next" pointer of a BRACES_COMPLEX
* node points to the node after the stuff to be repeated.
* The operand of some types of node is a literal string; for others, it is a
* node leading into a sub-FSM. In particular, the operand of a BRANCH node
* is the first node of the branch.
* (NB this is *not* a tree structure: the tail of the branch connects to the
* thing following the set of BRANCHes.)
*
* pattern is coded like:
*
* +-----------------+
* | V
* <aa>\|<bb> BRANCH <aa> BRANCH <bb> --> END
* | ^ | ^
* +------+ +----------+
*
*
* +------------------+
* V |
* <aa>* BRANCH BRANCH <aa> --> BACK BRANCH --> NOTHING --> END
* | | ^ ^
* | +---------------+ |
* +---------------------------------------------+
*
*
* +----------------------+
* V |
* <aa>\+ BRANCH <aa> --> BRANCH --> BACK BRANCH --> NOTHING --> END
* | | ^ ^
* | +-----------+ |
* +--------------------------------------------------+
*
*
* +-------------------------+
* V |
* <aa>\{} BRANCH BRACE_LIMITS --> BRACE_COMPLEX <aa> --> BACK END
* | | ^
* | +----------------+
* +-----------------------------------------------+
*
*
* <aa>\@!<bb> BRANCH NOMATCH <aa> --> END <bb> --> END
* | | ^ ^
* | +----------------+ |
* +--------------------------------+
*
* +---------+
* | V
* \z[abc] BRANCH BRANCH a BRANCH b BRANCH c BRANCH NOTHING --> END
* | | | | ^ ^
* | | | +-----+ |
* | | +----------------+ |
* | +---------------------------+ |
* +------------------------------------------------------+
*
* They all start with a BRANCH for "\|" alternatives, even when there is only
* one alternative.
*/
/*
* The opcodes are:
*/
/* definition number opnd? meaning */
#define END 0 /* End of program or NOMATCH operand. */
#define BOL 1 /* Match "" at beginning of line. */
#define EOL 2 /* Match "" at end of line. */
#define BRANCH 3 /* node Match this alternative, or the
* next... */
#define BACK 4 /* Match "", "next" ptr points backward. */
#define EXACTLY 5 /* str Match this string. */
#define NOTHING 6 /* Match empty string. */
#define STAR 7 /* node Match this (simple) thing 0 or more
* times. */
#define PLUS 8 /* node Match this (simple) thing 1 or more
* times. */
#define MATCH 9 /* node match the operand zero-width */
#define NOMATCH 10 /* node check for no match with operand */
#define BEHIND 11 /* node look behind for a match with operand */
#define NOBEHIND 12 /* node look behind for no match with operand */
#define SUBPAT 13 /* node match the operand here */
#define BRACE_SIMPLE 14 /* node Match this (simple) thing between m and
* n times (\{m,n\}). */
#define BOW 15 /* Match "" after [^a-zA-Z0-9_] */
#define EOW 16 /* Match "" at [^a-zA-Z0-9_] */
#define BRACE_LIMITS 17 /* nr nr define the min & max for BRACE_SIMPLE
* and BRACE_COMPLEX. */
#define NEWL 18 /* Match line-break */
#define BHPOS 19 /* End position for BEHIND or NOBEHIND */
/* character classes: 20-48 normal, 50-78 include a line-break */
#define ADD_NL 30
#define FIRST_NL ANY + ADD_NL
#define ANY 20 /* Match any one character. */
#define ANYOF 21 /* str Match any character in this string. */
#define ANYBUT 22 /* str Match any character not in this
* string. */
#define IDENT 23 /* Match identifier char */
#define SIDENT 24 /* Match identifier char but no digit */
#define KWORD 25 /* Match keyword char */
#define SKWORD 26 /* Match word char but no digit */
#define FNAME 27 /* Match file name char */
#define SFNAME 28 /* Match file name char but no digit */
#define PRINT 29 /* Match printable char */
#define SPRINT 30 /* Match printable char but no digit */
#define WHITE 31 /* Match whitespace char */
#define NWHITE 32 /* Match non-whitespace char */
#define DIGIT 33 /* Match digit char */
#define NDIGIT 34 /* Match non-digit char */
#define HEX 35 /* Match hex char */
#define NHEX 36 /* Match non-hex char */
#define OCTAL 37 /* Match octal char */
#define NOCTAL 38 /* Match non-octal char */
#define WORD 39 /* Match word char */
#define NWORD 40 /* Match non-word char */
#define HEAD 41 /* Match head char */
#define NHEAD 42 /* Match non-head char */
#define ALPHA 43 /* Match alpha char */
#define NALPHA 44 /* Match non-alpha char */
#define LOWER 45 /* Match lowercase char */
#define NLOWER 46 /* Match non-lowercase char */
#define UPPER 47 /* Match uppercase char */
#define NUPPER 48 /* Match non-uppercase char */
#define LAST_NL NUPPER + ADD_NL
#define WITH_NL(op) ((op) >= FIRST_NL && (op) <= LAST_NL)
#define MOPEN 80 /* -89 Mark this point in input as start of
* \( subexpr. MOPEN + 0 marks start of
* match. */
#define MCLOSE 90 /* -99 Analogous to MOPEN. MCLOSE + 0 marks
* end of match. */
#define BACKREF 100 /* -109 node Match same string again \1-\9 */
#ifdef FEAT_SYN_HL
# define ZOPEN 110 /* -119 Mark this point in input as start of
* \z( subexpr. */
# define ZCLOSE 120 /* -129 Analogous to ZOPEN. */
# define ZREF 130 /* -139 node Match external submatch \z1-\z9 */
#endif
#define BRACE_COMPLEX 140 /* -149 node Match nodes between m & n times */
#define NOPEN 150 /* Mark this point in input as start of
\%( subexpr. */
#define NCLOSE 151 /* Analogous to NOPEN. */
#define MULTIBYTECODE 200 /* mbc Match one multi-byte character */
#define RE_BOF 201 /* Match "" at beginning of file. */
#define RE_EOF 202 /* Match "" at end of file. */
#define CURSOR 203 /* Match location of cursor. */
#define RE_LNUM 204 /* nr cmp Match line number */
#define RE_COL 205 /* nr cmp Match column number */
#define RE_VCOL 206 /* nr cmp Match virtual column number */
#define RE_MARK 207 /* mark cmp Match mark position */
#define RE_VISUAL 208 /* Match Visual area */
/*
* Magic characters have a special meaning, they don't match literally.
* Magic characters are negative. This separates them from literal characters
* (possibly multi-byte). Only ASCII characters can be Magic.
*/
#define Magic(x) ((int)(x) - 256)
#define un_Magic(x) ((x) + 256)
#define is_Magic(x) ((x) < 0)
static int no_Magic __ARGS((int x));
static int toggle_Magic __ARGS((int x));
static int
no_Magic(x)
int x;
{
if (is_Magic(x))
return un_Magic(x);
return x;
}
static int
toggle_Magic(x)
int x;
{
if (is_Magic(x))
return un_Magic(x);
return Magic(x);
}
/*
* The first byte of the regexp internal "program" is actually this magic
* number; the start node begins in the second byte. It's used to catch the
* most severe mutilation of the program by the caller.
*/
#define REGMAGIC 0234
/*
* Opcode notes:
*
* BRANCH The set of branches constituting a single choice are hooked
* together with their "next" pointers, since precedence prevents
* anything being concatenated to any individual branch. The
* "next" pointer of the last BRANCH in a choice points to the
* thing following the whole choice. This is also where the
* final "next" pointer of each individual branch points; each
* branch starts with the operand node of a BRANCH node.
*
* BACK Normal "next" pointers all implicitly point forward; BACK
* exists to make loop structures possible.
*
* STAR,PLUS '=', and complex '*' and '+', are implemented as circular
* BRANCH structures using BACK. Simple cases (one character
* per match) are implemented with STAR and PLUS for speed
* and to minimize recursive plunges.
*
* BRACE_LIMITS This is always followed by a BRACE_SIMPLE or BRACE_COMPLEX
* node, and defines the min and max limits to be used for that
* node.
*
* MOPEN,MCLOSE ...are numbered at compile time.
* ZOPEN,ZCLOSE ...ditto
*/
/*
* A node is one char of opcode followed by two chars of "next" pointer.
* "Next" pointers are stored as two 8-bit bytes, high order first. The
* value is a positive offset from the opcode of the node containing it.
* An operand, if any, simply follows the node. (Note that much of the
* code generation knows about this implicit relationship.)
*
* Using two bytes for the "next" pointer is vast overkill for most things,
* but allows patterns to get big without disasters.
*/
#define OP(p) ((int)*(p))
#define NEXT(p) (((*((p) + 1) & 0377) << 8) + (*((p) + 2) & 0377))
#define OPERAND(p) ((p) + 3)
/* Obtain an operand that was stored as four bytes, MSB first. */
#define OPERAND_MIN(p) (((long)(p)[3] << 24) + ((long)(p)[4] << 16) \
+ ((long)(p)[5] << 8) + (long)(p)[6])
/* Obtain a second operand stored as four bytes. */
#define OPERAND_MAX(p) OPERAND_MIN((p) + 4)
/* Obtain a second single-byte operand stored after a four bytes operand. */
#define OPERAND_CMP(p) (p)[7]
/*
* Utility definitions.
*/
#define UCHARAT(p) ((int)*(char_u *)(p))
/* Used for an error (down from) vim_regcomp(): give the error message, set
* rc_did_emsg and return NULL */
#define EMSG_RET_NULL(m) return (EMSG(m), rc_did_emsg = TRUE, (void *)NULL)
#define EMSG_RET_FAIL(m) return (EMSG(m), rc_did_emsg = TRUE, FAIL)
#define EMSG2_RET_NULL(m, c) return (EMSG2((m), (c) ? "" : "\\"), rc_did_emsg = TRUE, (void *)NULL)
#define EMSG2_RET_FAIL(m, c) return (EMSG2((m), (c) ? "" : "\\"), rc_did_emsg = TRUE, FAIL)
#define EMSG_ONE_RET_NULL EMSG2_RET_NULL(_("E369: invalid item in %s%%[]"), reg_magic == MAGIC_ALL)
#define MAX_LIMIT (32767L << 16L)
static int re_multi_type __ARGS((int));
static int cstrncmp __ARGS((char_u *s1, char_u *s2, int *n));
static char_u *cstrchr __ARGS((char_u *, int));
#ifdef BT_REGEXP_DUMP
static void regdump __ARGS((char_u *, bt_regprog_T *));
#endif
#ifdef DEBUG
static char_u *regprop __ARGS((char_u *));
#endif
static char_u e_missingbracket[] = N_("E769: Missing ] after %s[");
static char_u e_unmatchedpp[] = N_("E53: Unmatched %s%%(");
static char_u e_unmatchedp[] = N_("E54: Unmatched %s(");
static char_u e_unmatchedpar[] = N_("E55: Unmatched %s)");
#ifdef FEAT_SYN_HL
static char_u e_z_not_allowed[] = N_("E66: \\z( not allowed here");
static char_u e_z1_not_allowed[] = N_("E67: \\z1 et al. not allowed here");
#endif
static char_u e_missing_sb[] = N_("E69: Missing ] after %s%%[");
static char_u e_empty_sb[] = N_("E70: Empty %s%%[]");
#define NOT_MULTI 0
#define MULTI_ONE 1
#define MULTI_MULT 2
/*
* Return NOT_MULTI if c is not a "multi" operator.
* Return MULTI_ONE if c is a single "multi" operator.
* Return MULTI_MULT if c is a multi "multi" operator.
*/
static int
re_multi_type(c)
int c;
{
if (c == Magic('@') || c == Magic('=') || c == Magic('?'))
return MULTI_ONE;
if (c == Magic('*') || c == Magic('+') || c == Magic('{'))
return MULTI_MULT;
return NOT_MULTI;
}
/*
* Flags to be passed up and down.
*/
#define HASWIDTH 0x1 /* Known never to match null string. */
#define SIMPLE 0x2 /* Simple enough to be STAR/PLUS operand. */
#define SPSTART 0x4 /* Starts with * or +. */
#define HASNL 0x8 /* Contains some \n. */
#define HASLOOKBH 0x10 /* Contains "\@<=" or "\@<!". */
#define WORST 0 /* Worst case. */
/*
* When regcode is set to this value, code is not emitted and size is computed
* instead.
*/
#define JUST_CALC_SIZE ((char_u *) -1)
static char_u *reg_prev_sub = NULL;
/*
* REGEXP_INRANGE contains all characters which are always special in a []
* range after '\'.
* REGEXP_ABBR contains all characters which act as abbreviations after '\'.
* These are:
* \n - New line (NL).
* \r - Carriage Return (CR).
* \t - Tab (TAB).
* \e - Escape (ESC).
* \b - Backspace (Ctrl_H).
* \d - Character code in decimal, eg \d123
* \o - Character code in octal, eg \o80
* \x - Character code in hex, eg \x4a
* \u - Multibyte character code, eg \u20ac
* \U - Long multibyte character code, eg \U12345678
*/
static char_u REGEXP_INRANGE[] = "]^-n\\";
static char_u REGEXP_ABBR[] = "nrtebdoxuU";
static int backslash_trans __ARGS((int c));
static int get_char_class __ARGS((char_u **pp));
static int get_equi_class __ARGS((char_u **pp));
static void reg_equi_class __ARGS((int c));
static int get_coll_element __ARGS((char_u **pp));
static char_u *skip_anyof __ARGS((char_u *p));
static void init_class_tab __ARGS((void));
/*
* Translate '\x' to its control character, except "\n", which is Magic.
*/
static int
backslash_trans(c)
int c;
{
switch (c)
{
case 'r': return CAR;
case 't': return TAB;
case 'e': return ESC;
case 'b': return BS;
}
return c;
}
/*
* Check for a character class name "[:name:]". "pp" points to the '['.
* Returns one of the CLASS_ items. CLASS_NONE means that no item was
* recognized. Otherwise "pp" is advanced to after the item.
*/
static int
get_char_class(pp)
char_u **pp;
{
static const char *(class_names[]) =
{
"alnum:]",
#define CLASS_ALNUM 0
"alpha:]",
#define CLASS_ALPHA 1
"blank:]",
#define CLASS_BLANK 2
"cntrl:]",
#define CLASS_CNTRL 3
"digit:]",
#define CLASS_DIGIT 4
"graph:]",
#define CLASS_GRAPH 5
"lower:]",
#define CLASS_LOWER 6
"print:]",
#define CLASS_PRINT 7
"punct:]",
#define CLASS_PUNCT 8
"space:]",
#define CLASS_SPACE 9
"upper:]",
#define CLASS_UPPER 10
"xdigit:]",
#define CLASS_XDIGIT 11
"tab:]",
#define CLASS_TAB 12
"return:]",
#define CLASS_RETURN 13
"backspace:]",
#define CLASS_BACKSPACE 14
"escape:]",
#define CLASS_ESCAPE 15
};
#define CLASS_NONE 99
int i;
if ((*pp)[1] == ':')
{
for (i = 0; i < (int)(sizeof(class_names) / sizeof(*class_names)); ++i)
if (STRNCMP(*pp + 2, class_names[i], STRLEN(class_names[i])) == 0)
{
*pp += STRLEN(class_names[i]) + 2;
return i;
}
}
return CLASS_NONE;
}
/*
* Specific version of character class functions.
* Using a table to keep this fast.
*/
static short class_tab[256];
#define RI_DIGIT 0x01
#define RI_HEX 0x02
#define RI_OCTAL 0x04
#define RI_WORD 0x08
#define RI_HEAD 0x10
#define RI_ALPHA 0x20
#define RI_LOWER 0x40
#define RI_UPPER 0x80
#define RI_WHITE 0x100
static void
init_class_tab()
{
int i;
static int done = FALSE;
if (done)
return;
for (i = 0; i < 256; ++i)
{
if (i >= '0' && i <= '7')
class_tab[i] = RI_DIGIT + RI_HEX + RI_OCTAL + RI_WORD;
else if (i >= '8' && i <= '9')
class_tab[i] = RI_DIGIT + RI_HEX + RI_WORD;
else if (i >= 'a' && i <= 'f')
class_tab[i] = RI_HEX + RI_WORD + RI_HEAD + RI_ALPHA + RI_LOWER;
#ifdef EBCDIC
else if ((i >= 'g' && i <= 'i') || (i >= 'j' && i <= 'r')
|| (i >= 's' && i <= 'z'))
#else
else if (i >= 'g' && i <= 'z')
#endif
class_tab[i] = RI_WORD + RI_HEAD + RI_ALPHA + RI_LOWER;
else if (i >= 'A' && i <= 'F')
class_tab[i] = RI_HEX + RI_WORD + RI_HEAD + RI_ALPHA + RI_UPPER;
#ifdef EBCDIC
else if ((i >= 'G' && i <= 'I') || ( i >= 'J' && i <= 'R')
|| (i >= 'S' && i <= 'Z'))
#else
else if (i >= 'G' && i <= 'Z')
#endif
class_tab[i] = RI_WORD + RI_HEAD + RI_ALPHA + RI_UPPER;
else if (i == '_')
class_tab[i] = RI_WORD + RI_HEAD;
else
class_tab[i] = 0;
}
class_tab[' '] |= RI_WHITE;
class_tab['\t'] |= RI_WHITE;
done = TRUE;
}
#ifdef FEAT_MBYTE
# define ri_digit(c) (c < 0x100 && (class_tab[c] & RI_DIGIT))
# define ri_hex(c) (c < 0x100 && (class_tab[c] & RI_HEX))
# define ri_octal(c) (c < 0x100 && (class_tab[c] & RI_OCTAL))
# define ri_word(c) (c < 0x100 && (class_tab[c] & RI_WORD))
# define ri_head(c) (c < 0x100 && (class_tab[c] & RI_HEAD))
# define ri_alpha(c) (c < 0x100 && (class_tab[c] & RI_ALPHA))
# define ri_lower(c) (c < 0x100 && (class_tab[c] & RI_LOWER))
# define ri_upper(c) (c < 0x100 && (class_tab[c] & RI_UPPER))
# define ri_white(c) (c < 0x100 && (class_tab[c] & RI_WHITE))
#else
# define ri_digit(c) (class_tab[c] & RI_DIGIT)
# define ri_hex(c) (class_tab[c] & RI_HEX)
# define ri_octal(c) (class_tab[c] & RI_OCTAL)
# define ri_word(c) (class_tab[c] & RI_WORD)
# define ri_head(c) (class_tab[c] & RI_HEAD)
# define ri_alpha(c) (class_tab[c] & RI_ALPHA)
# define ri_lower(c) (class_tab[c] & RI_LOWER)
# define ri_upper(c) (class_tab[c] & RI_UPPER)
# define ri_white(c) (class_tab[c] & RI_WHITE)
#endif
/* flags for regflags */
#define RF_ICASE 1 /* ignore case */
#define RF_NOICASE 2 /* don't ignore case */
#define RF_HASNL 4 /* can match a NL */
#define RF_ICOMBINE 8 /* ignore combining characters */
#define RF_LOOKBH 16 /* uses "\@<=" or "\@<!" */
/*
* Global work variables for vim_regcomp().
*/
static char_u *regparse; /* Input-scan pointer. */
static int prevchr_len; /* byte length of previous char */
static int num_complex_braces; /* Complex \{...} count */
static int regnpar; /* () count. */
#ifdef FEAT_SYN_HL
static int regnzpar; /* \z() count. */
static int re_has_z; /* \z item detected */
#endif
static char_u *regcode; /* Code-emit pointer, or JUST_CALC_SIZE */
static long regsize; /* Code size. */
static int reg_toolong; /* TRUE when offset out of range */
static char_u had_endbrace[NSUBEXP]; /* flags, TRUE if end of () found */
static unsigned regflags; /* RF_ flags for prog */
static long brace_min[10]; /* Minimums for complex brace repeats */
static long brace_max[10]; /* Maximums for complex brace repeats */
static int brace_count[10]; /* Current counts for complex brace repeats */
#if defined(FEAT_SYN_HL) || defined(PROTO)
static int had_eol; /* TRUE when EOL found by vim_regcomp() */
#endif
static int one_exactly = FALSE; /* only do one char for EXACTLY */
static int reg_magic; /* magicness of the pattern: */
#define MAGIC_NONE 1 /* "\V" very unmagic */
#define MAGIC_OFF 2 /* "\M" or 'magic' off */
#define MAGIC_ON 3 /* "\m" or 'magic' */
#define MAGIC_ALL 4 /* "\v" very magic */
static int reg_string; /* matching with a string instead of a buffer
line */
static int reg_strict; /* "[abc" is illegal */
/*
* META contains all characters that may be magic, except '^' and '$'.
*/
#ifdef EBCDIC
static char_u META[] = "%&()*+.123456789<=>?@ACDFHIKLMOPSUVWX[_acdfhiklmnopsuvwxz{|~";
#else
/* META[] is used often enough to justify turning it into a table. */
static char_u META_flags[] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* % & ( ) * + . */
0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 1, 1, 0, 0, 1, 0,
/* 1 2 3 4 5 6 7 8 9 < = > ? */
0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1,
/* @ A C D F H I K L M O */
1, 1, 0, 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1,
/* P S U V W X Z [ _ */
1, 0, 0, 1, 0, 1, 1, 1, 1, 0, 1, 1, 0, 0, 0, 1,
/* a c d f h i k l m n o */
0, 1, 0, 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1,
/* p s u v w x z { | ~ */
1, 0, 0, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1
};
#endif
static int curchr; /* currently parsed character */
/* Previous character. Note: prevchr is sometimes -1 when we are not at the
* start, eg in /[ ^I]^ the pattern was never found even if it existed,
* because ^ was taken to be magic -- webb */
static int prevchr;
static int prevprevchr; /* previous-previous character */
static int nextchr; /* used for ungetchr() */
/* arguments for reg() */
#define REG_NOPAREN 0 /* toplevel reg() */
#define REG_PAREN 1 /* \(\) */
#define REG_ZPAREN 2 /* \z(\) */
#define REG_NPAREN 3 /* \%(\) */
typedef struct
{
char_u *regparse;
int prevchr_len;
int curchr;
int prevchr;
int prevprevchr;
int nextchr;
int at_start;
int prev_at_start;
int regnpar;
} parse_state_T;
/*
* Forward declarations for vim_regcomp()'s friends.
*/
static void initchr __ARGS((char_u *));
static void save_parse_state __ARGS((parse_state_T *ps));
static void restore_parse_state __ARGS((parse_state_T *ps));
static int getchr __ARGS((void));
static void skipchr_keepstart __ARGS((void));
static int peekchr __ARGS((void));
static void skipchr __ARGS((void));
static void ungetchr __ARGS((void));
static int gethexchrs __ARGS((int maxinputlen));
static int getoctchrs __ARGS((void));
static int getdecchrs __ARGS((void));
static int coll_get_char __ARGS((void));
static void regcomp_start __ARGS((char_u *expr, int flags));
static char_u *reg __ARGS((int, int *));
static char_u *regbranch __ARGS((int *flagp));
static char_u *regconcat __ARGS((int *flagp));
static char_u *regpiece __ARGS((int *));
static char_u *regatom __ARGS((int *));
static char_u *regnode __ARGS((int));
#ifdef FEAT_MBYTE
static int use_multibytecode __ARGS((int c));
#endif
static int prog_magic_wrong __ARGS((void));
static char_u *regnext __ARGS((char_u *));
static void regc __ARGS((int b));
#ifdef FEAT_MBYTE
static void regmbc __ARGS((int c));
# define REGMBC(x) regmbc(x);
# define CASEMBC(x) case x:
#else
# define regmbc(c) regc(c)
# define REGMBC(x)
# define CASEMBC(x)
#endif
static void reginsert __ARGS((int, char_u *));
static void reginsert_nr __ARGS((int op, long val, char_u *opnd));
static void reginsert_limits __ARGS((int, long, long, char_u *));
static char_u *re_put_long __ARGS((char_u *pr, long_u val));
static int read_limits __ARGS((long *, long *));
static void regtail __ARGS((char_u *, char_u *));
static void regoptail __ARGS((char_u *, char_u *));
static regengine_T bt_regengine;
static regengine_T nfa_regengine;
/*
* Return TRUE if compiled regular expression "prog" can match a line break.
*/
int
re_multiline(prog)
regprog_T *prog;
{
return (prog->regflags & RF_HASNL);
}
/*
* Return TRUE if compiled regular expression "prog" looks before the start
* position (pattern contains "\@<=" or "\@<!").
*/
int
re_lookbehind(prog)
regprog_T *prog;
{
return (prog->regflags & RF_LOOKBH);
}
/*
* Check for an equivalence class name "[=a=]". "pp" points to the '['.
* Returns a character representing the class. Zero means that no item was
* recognized. Otherwise "pp" is advanced to after the item.
*/
static int
get_equi_class(pp)
char_u **pp;
{
int c;
int l = 1;
char_u *p = *pp;
if (p[1] == '=')
{
#ifdef FEAT_MBYTE
if (has_mbyte)
l = (*mb_ptr2len)(p + 2);
#endif
if (p[l + 2] == '=' && p[l + 3] == ']')
{
#ifdef FEAT_MBYTE
if (has_mbyte)
c = mb_ptr2char(p + 2);
else
#endif
c = p[2];
*pp += l + 4;
return c;
}
}
return 0;
}
#ifdef EBCDIC
/*
* Table for equivalence class "c". (IBM-1047)
*/
char *EQUIVAL_CLASS_C[16] = {
"A\x62\x63\x64\x65\x66\x67",
"C\x68",
"E\x71\x72\x73\x74",
"I\x75\x76\x77\x78",
"N\x69",
"O\xEB\xEC\xED\xEE\xEF",
"U\xFB\xFC\xFD\xFE",
"Y\xBA",
"a\x42\x43\x44\x45\x46\x47",
"c\x48",
"e\x51\x52\x53\x54",
"i\x55\x56\x57\x58",
"n\x49",
"o\xCB\xCC\xCD\xCE\xCF",
"u\xDB\xDC\xDD\xDE",
"y\x8D\xDF",
};
#endif
/*
* Produce the bytes for equivalence class "c".
* Currently only handles latin1, latin9 and utf-8.
* NOTE: When changing this function, also change nfa_emit_equi_class()
*/
static void
reg_equi_class(c)
int c;
{
#ifdef FEAT_MBYTE
if (enc_utf8 || STRCMP(p_enc, "latin1") == 0
|| STRCMP(p_enc, "iso-8859-15") == 0)
#endif
{
#ifdef EBCDIC
int i;
/* This might be slower than switch/case below. */
for (i = 0; i < 16; i++)
{
if (vim_strchr(EQUIVAL_CLASS_C[i], c) != NULL)
{
char *p = EQUIVAL_CLASS_C[i];
while (*p != 0)
regmbc(*p++);
return;
}
}
#else
switch (c)
{
case 'A': case '\300': case '\301': case '\302':
CASEMBC(0x100) CASEMBC(0x102) CASEMBC(0x104) CASEMBC(0x1cd)
CASEMBC(0x1de) CASEMBC(0x1e0) CASEMBC(0x1ea2)
case '\303': case '\304': case '\305':
regmbc('A'); regmbc('\300'); regmbc('\301');
regmbc('\302'); regmbc('\303'); regmbc('\304');
regmbc('\305');
REGMBC(0x100) REGMBC(0x102) REGMBC(0x104)
REGMBC(0x1cd) REGMBC(0x1de) REGMBC(0x1e0)
REGMBC(0x1ea2)
return;
case 'B': CASEMBC(0x1e02) CASEMBC(0x1e06)
regmbc('B'); REGMBC(0x1e02) REGMBC(0x1e06)
return;
case 'C': case '\307':
CASEMBC(0x106) CASEMBC(0x108) CASEMBC(0x10a) CASEMBC(0x10c)
regmbc('C'); regmbc('\307');
REGMBC(0x106) REGMBC(0x108) REGMBC(0x10a)
REGMBC(0x10c)
return;
case 'D': CASEMBC(0x10e) CASEMBC(0x110) CASEMBC(0x1e0a)
CASEMBC(0x1e0e) CASEMBC(0x1e10)
regmbc('D'); REGMBC(0x10e) REGMBC(0x110)
REGMBC(0x1e0a) REGMBC(0x1e0e) REGMBC(0x1e10)
return;
case 'E': case '\310': case '\311': case '\312': case '\313':
CASEMBC(0x112) CASEMBC(0x114) CASEMBC(0x116) CASEMBC(0x118)
CASEMBC(0x11a) CASEMBC(0x1eba) CASEMBC(0x1ebc)
regmbc('E'); regmbc('\310'); regmbc('\311');
regmbc('\312'); regmbc('\313');
REGMBC(0x112) REGMBC(0x114) REGMBC(0x116)
REGMBC(0x118) REGMBC(0x11a) REGMBC(0x1eba)
REGMBC(0x1ebc)
return;
case 'F': CASEMBC(0x1e1e)
regmbc('F'); REGMBC(0x1e1e)
return;
case 'G': CASEMBC(0x11c) CASEMBC(0x11e) CASEMBC(0x120)
CASEMBC(0x122) CASEMBC(0x1e4) CASEMBC(0x1e6) CASEMBC(0x1f4)
CASEMBC(0x1e20)
regmbc('G'); REGMBC(0x11c) REGMBC(0x11e)
REGMBC(0x120) REGMBC(0x122) REGMBC(0x1e4)
REGMBC(0x1e6) REGMBC(0x1f4) REGMBC(0x1e20)
return;
case 'H': CASEMBC(0x124) CASEMBC(0x126) CASEMBC(0x1e22)
CASEMBC(0x1e26) CASEMBC(0x1e28)
regmbc('H'); REGMBC(0x124) REGMBC(0x126)
REGMBC(0x1e22) REGMBC(0x1e26) REGMBC(0x1e28)
return;
case 'I': case '\314': case '\315': case '\316': case '\317':
CASEMBC(0x128) CASEMBC(0x12a) CASEMBC(0x12c) CASEMBC(0x12e)
CASEMBC(0x130) CASEMBC(0x1cf) CASEMBC(0x1ec8)
regmbc('I'); regmbc('\314'); regmbc('\315');
regmbc('\316'); regmbc('\317');
REGMBC(0x128) REGMBC(0x12a) REGMBC(0x12c)
REGMBC(0x12e) REGMBC(0x130) REGMBC(0x1cf)
REGMBC(0x1ec8)
return;
case 'J': CASEMBC(0x134)
regmbc('J'); REGMBC(0x134)
return;
case 'K': CASEMBC(0x136) CASEMBC(0x1e8) CASEMBC(0x1e30)
CASEMBC(0x1e34)
regmbc('K'); REGMBC(0x136) REGMBC(0x1e8)
REGMBC(0x1e30) REGMBC(0x1e34)
return;
case 'L': CASEMBC(0x139) CASEMBC(0x13b) CASEMBC(0x13d)
CASEMBC(0x13f) CASEMBC(0x141) CASEMBC(0x1e3a)
regmbc('L'); REGMBC(0x139) REGMBC(0x13b)
REGMBC(0x13d) REGMBC(0x13f) REGMBC(0x141)
REGMBC(0x1e3a)
return;
case 'M': CASEMBC(0x1e3e) CASEMBC(0x1e40)
regmbc('M'); REGMBC(0x1e3e) REGMBC(0x1e40)
return;
case 'N': case '\321':
CASEMBC(0x143) CASEMBC(0x145) CASEMBC(0x147) CASEMBC(0x1e44)
CASEMBC(0x1e48)
regmbc('N'); regmbc('\321');
REGMBC(0x143) REGMBC(0x145) REGMBC(0x147)
REGMBC(0x1e44) REGMBC(0x1e48)
return;
case 'O': case '\322': case '\323': case '\324': case '\325':
case '\326': case '\330':
CASEMBC(0x14c) CASEMBC(0x14e) CASEMBC(0x150) CASEMBC(0x1a0)
CASEMBC(0x1d1) CASEMBC(0x1ea) CASEMBC(0x1ec) CASEMBC(0x1ece)
regmbc('O'); regmbc('\322'); regmbc('\323');
regmbc('\324'); regmbc('\325'); regmbc('\326');
regmbc('\330');
REGMBC(0x14c) REGMBC(0x14e) REGMBC(0x150)
REGMBC(0x1a0) REGMBC(0x1d1) REGMBC(0x1ea)
REGMBC(0x1ec) REGMBC(0x1ece)
return;
case 'P': case 0x1e54: case 0x1e56:
regmbc('P'); REGMBC(0x1e54) REGMBC(0x1e56)
return;
case 'R': CASEMBC(0x154) CASEMBC(0x156) CASEMBC(0x158)
CASEMBC(0x1e58) CASEMBC(0x1e5e)
regmbc('R'); REGMBC(0x154) REGMBC(0x156) REGMBC(0x158)
REGMBC(0x1e58) REGMBC(0x1e5e)
return;
case 'S': CASEMBC(0x15a) CASEMBC(0x15c) CASEMBC(0x15e)
CASEMBC(0x160) CASEMBC(0x1e60)
regmbc('S'); REGMBC(0x15a) REGMBC(0x15c)
REGMBC(0x15e) REGMBC(0x160) REGMBC(0x1e60)
return;
case 'T': CASEMBC(0x162) CASEMBC(0x164) CASEMBC(0x166)
CASEMBC(0x1e6a) CASEMBC(0x1e6e)
regmbc('T'); REGMBC(0x162) REGMBC(0x164)
REGMBC(0x166) REGMBC(0x1e6a) REGMBC(0x1e6e)
return;
case 'U': case '\331': case '\332': case '\333': case '\334':
CASEMBC(0x168) CASEMBC(0x16a) CASEMBC(0x16c) CASEMBC(0x16e)
CASEMBC(0x170) CASEMBC(0x172) CASEMBC(0x1af) CASEMBC(0x1d3)
CASEMBC(0x1ee6)
regmbc('U'); regmbc('\331'); regmbc('\332');
regmbc('\333'); regmbc('\334');
REGMBC(0x168) REGMBC(0x16a) REGMBC(0x16c)
REGMBC(0x16e) REGMBC(0x170) REGMBC(0x172)
REGMBC(0x1af) REGMBC(0x1d3) REGMBC(0x1ee6)
return;
case 'V': CASEMBC(0x1e7c)
regmbc('V'); REGMBC(0x1e7c)
return;
case 'W': CASEMBC(0x174) CASEMBC(0x1e80) CASEMBC(0x1e82)
CASEMBC(0x1e84) CASEMBC(0x1e86)
regmbc('W'); REGMBC(0x174) REGMBC(0x1e80)
REGMBC(0x1e82) REGMBC(0x1e84) REGMBC(0x1e86)
return;
case 'X': CASEMBC(0x1e8a) CASEMBC(0x1e8c)
regmbc('X'); REGMBC(0x1e8a) REGMBC(0x1e8c)
return;
case 'Y': case '\335':
CASEMBC(0x176) CASEMBC(0x178) CASEMBC(0x1e8e) CASEMBC(0x1ef2)
CASEMBC(0x1ef6) CASEMBC(0x1ef8)
regmbc('Y'); regmbc('\335');
REGMBC(0x176) REGMBC(0x178) REGMBC(0x1e8e)
REGMBC(0x1ef2) REGMBC(0x1ef6) REGMBC(0x1ef8)
return;
case 'Z': CASEMBC(0x179) CASEMBC(0x17b) CASEMBC(0x17d)
CASEMBC(0x1b5) CASEMBC(0x1e90) CASEMBC(0x1e94)
regmbc('Z'); REGMBC(0x179) REGMBC(0x17b)
REGMBC(0x17d) REGMBC(0x1b5) REGMBC(0x1e90)
REGMBC(0x1e94)
return;
case 'a': case '\340': case '\341': case '\342':
case '\343': case '\344': case '\345':
CASEMBC(0x101) CASEMBC(0x103) CASEMBC(0x105) CASEMBC(0x1ce)
CASEMBC(0x1df) CASEMBC(0x1e1) CASEMBC(0x1ea3)
regmbc('a'); regmbc('\340'); regmbc('\341');
regmbc('\342'); regmbc('\343'); regmbc('\344');
regmbc('\345');
REGMBC(0x101) REGMBC(0x103) REGMBC(0x105)
REGMBC(0x1ce) REGMBC(0x1df) REGMBC(0x1e1)
REGMBC(0x1ea3)
return;