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Dialog sheet animation can no longer cause a crash
[MacVim.git] / src / regexp.c
blobdc0433dbf8beac301766d33e3c94101e61be5e49
1 /* vi:set ts=8 sts=4 sw=4:
2 *
3 * Handling of regular expressions: vim_regcomp(), vim_regexec(), vim_regsub()
4 *
5 * NOTICE:
6 *
7 * This is NOT the original regular expression code as written by Henry
8 * Spencer. This code has been modified specifically for use with the VIM
9 * editor, and should not be used separately from Vim. If you want a good
10 * regular expression library, get the original code. The copyright notice
11 * that follows is from the original.
12 *
13 * END NOTICE
14 *
15 * Copyright (c) 1986 by University of Toronto.
16 * Written by Henry Spencer. Not derived from licensed software.
17 *
18 * Permission is granted to anyone to use this software for any
19 * purpose on any computer system, and to redistribute it freely,
20 * subject to the following restrictions:
21 *
22 * 1. The author is not responsible for the consequences of use of
23 * this software, no matter how awful, even if they arise
24 * from defects in it.
25 *
26 * 2. The origin of this software must not be misrepresented, either
27 * by explicit claim or by omission.
28 *
29 * 3. Altered versions must be plainly marked as such, and must not
30 * be misrepresented as being the original software.
31 *
32 * Beware that some of this code is subtly aware of the way operator
33 * precedence is structured in regular expressions. Serious changes in
34 * regular-expression syntax might require a total rethink.
35 *
36 * Changes have been made by Tony Andrews, Olaf 'Rhialto' Seibert, Robert
37 * Webb, Ciaran McCreesh and Bram Moolenaar.
38 * Named character class support added by Walter Briscoe (1998 Jul 01)
39 */
40
41 #include "vim.h"
42
43 #undef DEBUG
44
45 /*
46 * The "internal use only" fields in regexp.h are present to pass info from
47 * compile to execute that permits the execute phase to run lots faster on
48 * simple cases. They are:
49 *
50 * regstart char that must begin a match; NUL if none obvious; Can be a
51 * multi-byte character.
52 * reganch is the match anchored (at beginning-of-line only)?
53 * regmust string (pointer into program) that match must include, or NULL
54 * regmlen length of regmust string
55 * regflags RF_ values or'ed together
56 *
57 * Regstart and reganch permit very fast decisions on suitable starting points
58 * for a match, cutting down the work a lot. Regmust permits fast rejection
59 * of lines that cannot possibly match. The regmust tests are costly enough
60 * that vim_regcomp() supplies a regmust only if the r.e. contains something
61 * potentially expensive (at present, the only such thing detected is * or +
62 * at the start of the r.e., which can involve a lot of backup). Regmlen is
63 * supplied because the test in vim_regexec() needs it and vim_regcomp() is
64 * computing it anyway.
65 */
66
67 /*
68 * Structure for regexp "program". This is essentially a linear encoding
69 * of a nondeterministic finite-state machine (aka syntax charts or
70 * "railroad normal form" in parsing technology). Each node is an opcode
71 * plus a "next" pointer, possibly plus an operand. "Next" pointers of
72 * all nodes except BRANCH and BRACES_COMPLEX implement concatenation; a "next"
73 * pointer with a BRANCH on both ends of it is connecting two alternatives.
74 * (Here we have one of the subtle syntax dependencies: an individual BRANCH
75 * (as opposed to a collection of them) is never concatenated with anything
76 * because of operator precedence). The "next" pointer of a BRACES_COMPLEX
77 * node points to the node after the stuff to be repeated.
78 * The operand of some types of node is a literal string; for others, it is a
79 * node leading into a sub-FSM. In particular, the operand of a BRANCH node
80 * is the first node of the branch.
81 * (NB this is *not* a tree structure: the tail of the branch connects to the
82 * thing following the set of BRANCHes.)
83 *
84 * pattern is coded like:
85 *
86 * +-----------------+
87 * | V
88 * <aa>\|<bb> BRANCH <aa> BRANCH <bb> --> END
89 * | ^ | ^
90 * +------+ +----------+
91 *
92 *
93 * +------------------+
94 * V |
95 * <aa>* BRANCH BRANCH <aa> --> BACK BRANCH --> NOTHING --> END
96 * | | ^ ^
97 * | +---------------+ |
98 * +---------------------------------------------+
99 *
100 *
101 * +----------------------+
102 * V |
103 * <aa>\+ BRANCH <aa> --> BRANCH --> BACK BRANCH --> NOTHING --> END
104 * | | ^ ^
105 * | +-----------+ |
106 * +--------------------------------------------------+
107 *
108 *
109 * +-------------------------+
110 * V |
111 * <aa>\{} BRANCH BRACE_LIMITS --> BRACE_COMPLEX <aa> --> BACK END
112 * | | ^
113 * | +----------------+
114 * +-----------------------------------------------+
115 *
116 *
117 * <aa>\@!<bb> BRANCH NOMATCH <aa> --> END <bb> --> END
118 * | | ^ ^
119 * | +----------------+ |
120 * +--------------------------------+
121 *
122 * +---------+
123 * | V
124 * \z[abc] BRANCH BRANCH a BRANCH b BRANCH c BRANCH NOTHING --> END
125 * | | | | ^ ^
126 * | | | +-----+ |
127 * | | +----------------+ |
128 * | +---------------------------+ |
129 * +------------------------------------------------------+
130 *
131 * They all start with a BRANCH for "\|" alternatives, even when there is only
132 * one alternative.
133 */
134
135 /*
136 * The opcodes are:
137 */
138
139 /* definition number opnd? meaning */
140 #define END 0 /* End of program or NOMATCH operand. */
141 #define BOL 1 /* Match "" at beginning of line. */
142 #define EOL 2 /* Match "" at end of line. */
143 #define BRANCH 3 /* node Match this alternative, or the
144 * next... */
145 #define BACK 4 /* Match "", "next" ptr points backward. */
146 #define EXACTLY 5 /* str Match this string. */
147 #define NOTHING 6 /* Match empty string. */
148 #define STAR 7 /* node Match this (simple) thing 0 or more
149 * times. */
150 #define PLUS 8 /* node Match this (simple) thing 1 or more
151 * times. */
152 #define MATCH 9 /* node match the operand zero-width */
153 #define NOMATCH 10 /* node check for no match with operand */
154 #define BEHIND 11 /* node look behind for a match with operand */
155 #define NOBEHIND 12 /* node look behind for no match with operand */
156 #define SUBPAT 13 /* node match the operand here */
157 #define BRACE_SIMPLE 14 /* node Match this (simple) thing between m and
158 * n times (\{m,n\}). */
159 #define BOW 15 /* Match "" after [^a-zA-Z0-9_] */
160 #define EOW 16 /* Match "" at [^a-zA-Z0-9_] */
161 #define BRACE_LIMITS 17 /* nr nr define the min & max for BRACE_SIMPLE
162 * and BRACE_COMPLEX. */
163 #define NEWL 18 /* Match line-break */
164 #define BHPOS 19 /* End position for BEHIND or NOBEHIND */
165
166
167 /* character classes: 20-48 normal, 50-78 include a line-break */
168 #define ADD_NL 30
169 #define FIRST_NL ANY + ADD_NL
170 #define ANY 20 /* Match any one character. */
171 #define ANYOF 21 /* str Match any character in this string. */
172 #define ANYBUT 22 /* str Match any character not in this
173 * string. */
174 #define IDENT 23 /* Match identifier char */
175 #define SIDENT 24 /* Match identifier char but no digit */
176 #define KWORD 25 /* Match keyword char */
177 #define SKWORD 26 /* Match word char but no digit */
178 #define FNAME 27 /* Match file name char */
179 #define SFNAME 28 /* Match file name char but no digit */
180 #define PRINT 29 /* Match printable char */
181 #define SPRINT 30 /* Match printable char but no digit */
182 #define WHITE 31 /* Match whitespace char */
183 #define NWHITE 32 /* Match non-whitespace char */
184 #define DIGIT 33 /* Match digit char */
185 #define NDIGIT 34 /* Match non-digit char */
186 #define HEX 35 /* Match hex char */
187 #define NHEX 36 /* Match non-hex char */
188 #define OCTAL 37 /* Match octal char */
189 #define NOCTAL 38 /* Match non-octal char */
190 #define WORD 39 /* Match word char */
191 #define NWORD 40 /* Match non-word char */
192 #define HEAD 41 /* Match head char */
193 #define NHEAD 42 /* Match non-head char */
194 #define ALPHA 43 /* Match alpha char */
195 #define NALPHA 44 /* Match non-alpha char */
196 #define LOWER 45 /* Match lowercase char */
197 #define NLOWER 46 /* Match non-lowercase char */
198 #define UPPER 47 /* Match uppercase char */
199 #define NUPPER 48 /* Match non-uppercase char */
200 #define LAST_NL NUPPER + ADD_NL
201 #define WITH_NL(op) ((op) >= FIRST_NL && (op) <= LAST_NL)
202
203 #define MOPEN 80 /* -89 Mark this point in input as start of
204 * \( subexpr. MOPEN + 0 marks start of
205 * match. */
206 #define MCLOSE 90 /* -99 Analogous to MOPEN. MCLOSE + 0 marks
207 * end of match. */
208 #define BACKREF 100 /* -109 node Match same string again \1-\9 */
209
210 #ifdef FEAT_SYN_HL
211 # define ZOPEN 110 /* -119 Mark this point in input as start of
212 * \z( subexpr. */
213 # define ZCLOSE 120 /* -129 Analogous to ZOPEN. */
214 # define ZREF 130 /* -139 node Match external submatch \z1-\z9 */
215 #endif
216
217 #define BRACE_COMPLEX 140 /* -149 node Match nodes between m & n times */
218
219 #define NOPEN 150 /* Mark this point in input as start of
220 \%( subexpr. */
221 #define NCLOSE 151 /* Analogous to NOPEN. */
222
223 #define MULTIBYTECODE 200 /* mbc Match one multi-byte character */
224 #define RE_BOF 201 /* Match "" at beginning of file. */
225 #define RE_EOF 202 /* Match "" at end of file. */
226 #define CURSOR 203 /* Match location of cursor. */
227
228 #define RE_LNUM 204 /* nr cmp Match line number */
229 #define RE_COL 205 /* nr cmp Match column number */
230 #define RE_VCOL 206 /* nr cmp Match virtual column number */
231
232 #define RE_MARK 207 /* mark cmp Match mark position */
233 #define RE_VISUAL 208 /* Match Visual area */
234
235 /*
236 * Magic characters have a special meaning, they don't match literally.
237 * Magic characters are negative. This separates them from literal characters
238 * (possibly multi-byte). Only ASCII characters can be Magic.
239 */
240 #define Magic(x) ((int)(x) - 256)
241 #define un_Magic(x) ((x) + 256)
242 #define is_Magic(x) ((x) < 0)
243
244 static int no_Magic __ARGS((int x));
245 static int toggle_Magic __ARGS((int x));
246
247 static int
248 no_Magic(x)
249 int x;
250 {
251 if (is_Magic(x))
252 return un_Magic(x);
253 return x;
254 }
255
256 static int
257 toggle_Magic(x)
258 int x;
259 {
260 if (is_Magic(x))
261 return un_Magic(x);
262 return Magic(x);
263 }
264
265 /*
266 * The first byte of the regexp internal "program" is actually this magic
267 * number; the start node begins in the second byte. It's used to catch the
268 * most severe mutilation of the program by the caller.
269 */
270
271 #define REGMAGIC 0234
272
273 /*
274 * Opcode notes:
275 *
276 * BRANCH The set of branches constituting a single choice are hooked
277 * together with their "next" pointers, since precedence prevents
278 * anything being concatenated to any individual branch. The
279 * "next" pointer of the last BRANCH in a choice points to the
280 * thing following the whole choice. This is also where the
281 * final "next" pointer of each individual branch points; each
282 * branch starts with the operand node of a BRANCH node.
283 *
284 * BACK Normal "next" pointers all implicitly point forward; BACK
285 * exists to make loop structures possible.
286 *
287 * STAR,PLUS '=', and complex '*' and '+', are implemented as circular
288 * BRANCH structures using BACK. Simple cases (one character
289 * per match) are implemented with STAR and PLUS for speed
290 * and to minimize recursive plunges.
291 *
292 * BRACE_LIMITS This is always followed by a BRACE_SIMPLE or BRACE_COMPLEX
293 * node, and defines the min and max limits to be used for that
294 * node.
295 *
296 * MOPEN,MCLOSE ...are numbered at compile time.
297 * ZOPEN,ZCLOSE ...ditto
298 */
299
300 /*
301 * A node is one char of opcode followed by two chars of "next" pointer.
302 * "Next" pointers are stored as two 8-bit bytes, high order first. The
303 * value is a positive offset from the opcode of the node containing it.
304 * An operand, if any, simply follows the node. (Note that much of the
305 * code generation knows about this implicit relationship.)
306 *
307 * Using two bytes for the "next" pointer is vast overkill for most things,
308 * but allows patterns to get big without disasters.
309 */
310 #define OP(p) ((int)*(p))
311 #define NEXT(p) (((*((p) + 1) & 0377) << 8) + (*((p) + 2) & 0377))
312 #define OPERAND(p) ((p) + 3)
313 /* Obtain an operand that was stored as four bytes, MSB first. */
314 #define OPERAND_MIN(p) (((long)(p)[3] << 24) + ((long)(p)[4] << 16) \
315 + ((long)(p)[5] << 8) + (long)(p)[6])
316 /* Obtain a second operand stored as four bytes. */
317 #define OPERAND_MAX(p) OPERAND_MIN((p) + 4)
318 /* Obtain a second single-byte operand stored after a four bytes operand. */
319 #define OPERAND_CMP(p) (p)[7]
320
321 /*
322 * Utility definitions.
323 */
324 #define UCHARAT(p) ((int)*(char_u *)(p))
325
326 /* Used for an error (down from) vim_regcomp(): give the error message, set
327 * rc_did_emsg and return NULL */
328 #define EMSG_RET_NULL(m) return (EMSG(m), rc_did_emsg = TRUE, (void *)NULL)
329 #define EMSG_M_RET_NULL(m, c) return (EMSG2((m), (c) ? "" : "\\"), rc_did_emsg = TRUE, (void *)NULL)
330 #define EMSG_RET_FAIL(m) return (EMSG(m), rc_did_emsg = TRUE, FAIL)
331 #define EMSG_ONE_RET_NULL EMSG_M_RET_NULL(_("E369: invalid item in %s%%[]"), reg_magic == MAGIC_ALL)
332
333 #define MAX_LIMIT (32767L << 16L)
334
335 static int re_multi_type __ARGS((int));
336 static int cstrncmp __ARGS((char_u *s1, char_u *s2, int *n));
337 static char_u *cstrchr __ARGS((char_u *, int));
338
339 #ifdef DEBUG
340 static void regdump __ARGS((char_u *, regprog_T *));
341 static char_u *regprop __ARGS((char_u *));
342 #endif
343
344 #define NOT_MULTI 0
345 #define MULTI_ONE 1
346 #define MULTI_MULT 2
347 /*
348 * Return NOT_MULTI if c is not a "multi" operator.
349 * Return MULTI_ONE if c is a single "multi" operator.
350 * Return MULTI_MULT if c is a multi "multi" operator.
351 */
352 static int
353 re_multi_type(c)
354 int c;
355 {
356 if (c == Magic('@') || c == Magic('=') || c == Magic('?'))
357 return MULTI_ONE;
358 if (c == Magic('*') || c == Magic('+') || c == Magic('{'))
359 return MULTI_MULT;
360 return NOT_MULTI;
361 }
362
363 /*
364 * Flags to be passed up and down.
365 */
366 #define HASWIDTH 0x1 /* Known never to match null string. */
367 #define SIMPLE 0x2 /* Simple enough to be STAR/PLUS operand. */
368 #define SPSTART 0x4 /* Starts with * or +. */
369 #define HASNL 0x8 /* Contains some \n. */
370 #define HASLOOKBH 0x10 /* Contains "\@<=" or "\@<!". */
371 #define WORST 0 /* Worst case. */
372
373 /*
374 * When regcode is set to this value, code is not emitted and size is computed
375 * instead.
376 */
377 #define JUST_CALC_SIZE ((char_u *) -1)
378
379 static char_u *reg_prev_sub = NULL;
380
381 /*
382 * REGEXP_INRANGE contains all characters which are always special in a []
383 * range after '\'.
384 * REGEXP_ABBR contains all characters which act as abbreviations after '\'.
385 * These are:
386 * \n - New line (NL).
387 * \r - Carriage Return (CR).
388 * \t - Tab (TAB).
389 * \e - Escape (ESC).
390 * \b - Backspace (Ctrl_H).
391 * \d - Character code in decimal, eg \d123
392 * \o - Character code in octal, eg \o80
393 * \x - Character code in hex, eg \x4a
394 * \u - Multibyte character code, eg \u20ac
395 * \U - Long multibyte character code, eg \U12345678
396 */
397 static char_u REGEXP_INRANGE[] = "]^-n\\";
398 static char_u REGEXP_ABBR[] = "nrtebdoxuU";
399
400 static int backslash_trans __ARGS((int c));
401 static int get_char_class __ARGS((char_u **pp));
402 static int get_equi_class __ARGS((char_u **pp));
403 static void reg_equi_class __ARGS((int c));
404 static int get_coll_element __ARGS((char_u **pp));
405 static char_u *skip_anyof __ARGS((char_u *p));
406 static void init_class_tab __ARGS((void));
407
408 /*
409 * Translate '\x' to its control character, except "\n", which is Magic.
410 */
411 static int
412 backslash_trans(c)
413 int c;
414 {
415 switch (c)
416 {
417 case 'r': return CAR;
418 case 't': return TAB;
419 case 'e': return ESC;
420 case 'b': return BS;
421 }
422 return c;
423 }
424
425 /*
426 * Check for a character class name "[:name:]". "pp" points to the '['.
427 * Returns one of the CLASS_ items. CLASS_NONE means that no item was
428 * recognized. Otherwise "pp" is advanced to after the item.
429 */
430 static int
431 get_char_class(pp)
432 char_u **pp;
433 {
434 static const char *(class_names[]) =
435 {
436 "alnum:]",
437 #define CLASS_ALNUM 0
438 "alpha:]",
439 #define CLASS_ALPHA 1
440 "blank:]",
441 #define CLASS_BLANK 2
442 "cntrl:]",
443 #define CLASS_CNTRL 3
444 "digit:]",
445 #define CLASS_DIGIT 4
446 "graph:]",
447 #define CLASS_GRAPH 5
448 "lower:]",
449 #define CLASS_LOWER 6
450 "print:]",
451 #define CLASS_PRINT 7
452 "punct:]",
453 #define CLASS_PUNCT 8
454 "space:]",
455 #define CLASS_SPACE 9
456 "upper:]",
457 #define CLASS_UPPER 10
458 "xdigit:]",
459 #define CLASS_XDIGIT 11
460 "tab:]",
461 #define CLASS_TAB 12
462 "return:]",
463 #define CLASS_RETURN 13
464 "backspace:]",
465 #define CLASS_BACKSPACE 14
466 "escape:]",
467 #define CLASS_ESCAPE 15
468 };
469 #define CLASS_NONE 99
470 int i;
471
472 if ((*pp)[1] == ':')
473 {
474 for (i = 0; i < (int)(sizeof(class_names) / sizeof(*class_names)); ++i)
475 if (STRNCMP(*pp + 2, class_names[i], STRLEN(class_names[i])) == 0)
476 {
477 *pp += STRLEN(class_names[i]) + 2;
478 return i;
479 }
480 }
481 return CLASS_NONE;
482 }
483
484 /*
485 * Specific version of character class functions.
486 * Using a table to keep this fast.
487 */
488 static short class_tab[256];
489
490 #define RI_DIGIT 0x01
491 #define RI_HEX 0x02
492 #define RI_OCTAL 0x04
493 #define RI_WORD 0x08
494 #define RI_HEAD 0x10
495 #define RI_ALPHA 0x20
496 #define RI_LOWER 0x40
497 #define RI_UPPER 0x80
498 #define RI_WHITE 0x100
499
500 static void
501 init_class_tab()
502 {
503 int i;
504 static int done = FALSE;
505
506 if (done)
507 return;
508
509 for (i = 0; i < 256; ++i)
510 {
511 if (i >= '0' && i <= '7')
512 class_tab[i] = RI_DIGIT + RI_HEX + RI_OCTAL + RI_WORD;
513 else if (i >= '8' && i <= '9')
514 class_tab[i] = RI_DIGIT + RI_HEX + RI_WORD;
515 else if (i >= 'a' && i <= 'f')
516 class_tab[i] = RI_HEX + RI_WORD + RI_HEAD + RI_ALPHA + RI_LOWER;
517 #ifdef EBCDIC
518 else if ((i >= 'g' && i <= 'i') || (i >= 'j' && i <= 'r')
519 || (i >= 's' && i <= 'z'))
520 #else
521 else if (i >= 'g' && i <= 'z')
522 #endif
523 class_tab[i] = RI_WORD + RI_HEAD + RI_ALPHA + RI_LOWER;
524 else if (i >= 'A' && i <= 'F')
525 class_tab[i] = RI_HEX + RI_WORD + RI_HEAD + RI_ALPHA + RI_UPPER;
526 #ifdef EBCDIC
527 else if ((i >= 'G' && i <= 'I') || ( i >= 'J' && i <= 'R')
528 || (i >= 'S' && i <= 'Z'))
529 #else
530 else if (i >= 'G' && i <= 'Z')
531 #endif
532 class_tab[i] = RI_WORD + RI_HEAD + RI_ALPHA + RI_UPPER;
533 else if (i == '_')
534 class_tab[i] = RI_WORD + RI_HEAD;
535 else
536 class_tab[i] = 0;
537 }
538 class_tab[' '] |= RI_WHITE;
539 class_tab['\t'] |= RI_WHITE;
540 done = TRUE;
541 }
542
543 #ifdef FEAT_MBYTE
544 # define ri_digit(c) (c < 0x100 && (class_tab[c] & RI_DIGIT))
545 # define ri_hex(c) (c < 0x100 && (class_tab[c] & RI_HEX))
546 # define ri_octal(c) (c < 0x100 && (class_tab[c] & RI_OCTAL))
547 # define ri_word(c) (c < 0x100 && (class_tab[c] & RI_WORD))
548 # define ri_head(c) (c < 0x100 && (class_tab[c] & RI_HEAD))
549 # define ri_alpha(c) (c < 0x100 && (class_tab[c] & RI_ALPHA))
550 # define ri_lower(c) (c < 0x100 && (class_tab[c] & RI_LOWER))
551 # define ri_upper(c) (c < 0x100 && (class_tab[c] & RI_UPPER))
552 # define ri_white(c) (c < 0x100 && (class_tab[c] & RI_WHITE))
553 #else
554 # define ri_digit(c) (class_tab[c] & RI_DIGIT)
555 # define ri_hex(c) (class_tab[c] & RI_HEX)
556 # define ri_octal(c) (class_tab[c] & RI_OCTAL)
557 # define ri_word(c) (class_tab[c] & RI_WORD)
558 # define ri_head(c) (class_tab[c] & RI_HEAD)
559 # define ri_alpha(c) (class_tab[c] & RI_ALPHA)
560 # define ri_lower(c) (class_tab[c] & RI_LOWER)
561 # define ri_upper(c) (class_tab[c] & RI_UPPER)
562 # define ri_white(c) (class_tab[c] & RI_WHITE)
563 #endif
564
565 /* flags for regflags */
566 #define RF_ICASE 1 /* ignore case */
567 #define RF_NOICASE 2 /* don't ignore case */
568 #define RF_HASNL 4 /* can match a NL */
569 #define RF_ICOMBINE 8 /* ignore combining characters */
570 #define RF_LOOKBH 16 /* uses "\@<=" or "\@<!" */
571
572 /*
573 * Global work variables for vim_regcomp().
574 */
575
576 static char_u *regparse; /* Input-scan pointer. */
577 static int prevchr_len; /* byte length of previous char */
578 static int num_complex_braces; /* Complex \{...} count */
579 static int regnpar; /* () count. */
580 #ifdef FEAT_SYN_HL
581 static int regnzpar; /* \z() count. */
582 static int re_has_z; /* \z item detected */
583 #endif
584 static char_u *regcode; /* Code-emit pointer, or JUST_CALC_SIZE */
585 static long regsize; /* Code size. */
586 static char_u had_endbrace[NSUBEXP]; /* flags, TRUE if end of () found */
587 static unsigned regflags; /* RF_ flags for prog */
588 static long brace_min[10]; /* Minimums for complex brace repeats */
589 static long brace_max[10]; /* Maximums for complex brace repeats */
590 static int brace_count[10]; /* Current counts for complex brace repeats */
591 #if defined(FEAT_SYN_HL) || defined(PROTO)
592 static int had_eol; /* TRUE when EOL found by vim_regcomp() */
593 #endif
594 static int one_exactly = FALSE; /* only do one char for EXACTLY */
595
596 static int reg_magic; /* magicness of the pattern: */
597 #define MAGIC_NONE 1 /* "\V" very unmagic */
598 #define MAGIC_OFF 2 /* "\M" or 'magic' off */
599 #define MAGIC_ON 3 /* "\m" or 'magic' */
600 #define MAGIC_ALL 4 /* "\v" very magic */
601
602 static int reg_string; /* matching with a string instead of a buffer
603 line */
604 static int reg_strict; /* "[abc" is illegal */
605
606 /*
607 * META contains all characters that may be magic, except '^' and '$'.
608 */
609
610 #ifdef EBCDIC
611 static char_u META[] = "%&()*+.123456789<=>?@ACDFHIKLMOPSUVWX[_acdfhiklmnopsuvwxz{|~";
612 #else
613 /* META[] is used often enough to justify turning it into a table. */
614 static char_u META_flags[] = {
615 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
616 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
617 /* % & ( ) * + . */
618 0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 1, 1, 0, 0, 1, 0,
619 /* 1 2 3 4 5 6 7 8 9 < = > ? */
620 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1,
621 /* @ A C D F H I K L M O */
622 1, 1, 0, 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1,
623 /* P S U V W X Z [ _ */
624 1, 0, 0, 1, 0, 1, 1, 1, 1, 0, 1, 1, 0, 0, 0, 1,
625 /* a c d f h i k l m n o */
626 0, 1, 0, 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1,
627 /* p s u v w x z { | ~ */
628 1, 0, 0, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1
629 };
630 #endif
631
632 static int curchr;
633
634 /* arguments for reg() */
635 #define REG_NOPAREN 0 /* toplevel reg() */
636 #define REG_PAREN 1 /* \(\) */
637 #define REG_ZPAREN 2 /* \z(\) */
638 #define REG_NPAREN 3 /* \%(\) */
639
640 /*
641 * Forward declarations for vim_regcomp()'s friends.
642 */
643 static void initchr __ARGS((char_u *));
644 static int getchr __ARGS((void));
645 static void skipchr_keepstart __ARGS((void));
646 static int peekchr __ARGS((void));
647 static void skipchr __ARGS((void));
648 static void ungetchr __ARGS((void));
649 static int gethexchrs __ARGS((int maxinputlen));
650 static int getoctchrs __ARGS((void));
651 static int getdecchrs __ARGS((void));
652 static int coll_get_char __ARGS((void));
653 static void regcomp_start __ARGS((char_u *expr, int flags));
654 static char_u *reg __ARGS((int, int *));
655 static char_u *regbranch __ARGS((int *flagp));
656 static char_u *regconcat __ARGS((int *flagp));
657 static char_u *regpiece __ARGS((int *));
658 static char_u *regatom __ARGS((int *));
659 static char_u *regnode __ARGS((int));
660 #ifdef FEAT_MBYTE
661 static int use_multibytecode __ARGS((int c));
662 #endif
663 static int prog_magic_wrong __ARGS((void));
664 static char_u *regnext __ARGS((char_u *));
665 static void regc __ARGS((int b));
666 #ifdef FEAT_MBYTE
667 static void regmbc __ARGS((int c));
668 #else
669 # define regmbc(c) regc(c)
670 #endif
671 static void reginsert __ARGS((int, char_u *));
672 static void reginsert_limits __ARGS((int, long, long, char_u *));
673 static char_u *re_put_long __ARGS((char_u *pr, long_u val));
674 static int read_limits __ARGS((long *, long *));
675 static void regtail __ARGS((char_u *, char_u *));
676 static void regoptail __ARGS((char_u *, char_u *));
677
678 /*
679 * Return TRUE if compiled regular expression "prog" can match a line break.
680 */
681 int
682 re_multiline(prog)
683 regprog_T *prog;
684 {
685 return (prog->regflags & RF_HASNL);
686 }
687
688 /*
689 * Return TRUE if compiled regular expression "prog" looks before the start
690 * position (pattern contains "\@<=" or "\@<!").
691 */
692 int
693 re_lookbehind(prog)
694 regprog_T *prog;
695 {
696 return (prog->regflags & RF_LOOKBH);
697 }
698
699 /*
700 * Check for an equivalence class name "[=a=]". "pp" points to the '['.
701 * Returns a character representing the class. Zero means that no item was
702 * recognized. Otherwise "pp" is advanced to after the item.
703 */
704 static int
705 get_equi_class(pp)
706 char_u **pp;
707 {
708 int c;
709 int l = 1;
710 char_u *p = *pp;
711
712 if (p[1] == '=')
713 {
714 #ifdef FEAT_MBYTE
715 if (has_mbyte)
716 l = (*mb_ptr2len)(p + 2);
717 #endif
718 if (p[l + 2] == '=' && p[l + 3] == ']')
719 {
720 #ifdef FEAT_MBYTE
721 if (has_mbyte)
722 c = mb_ptr2char(p + 2);
723 else
724 #endif
725 c = p[2];
726 *pp += l + 4;
727 return c;
728 }
729 }
730 return 0;
731 }
732
733 /*
734 * Produce the bytes for equivalence class "c".
735 * Currently only handles latin1, latin9 and utf-8.
736 */
737 static void
738 reg_equi_class(c)
739 int c;
740 {
741 #ifdef FEAT_MBYTE
742 if (enc_utf8 || STRCMP(p_enc, "latin1") == 0
743 || STRCMP(p_enc, "iso-8859-15") == 0)
744 #endif
745 {
746 switch (c)
747 {
748 case 'A': case '\300': case '\301': case '\302':
749 case '\303': case '\304': case '\305':
750 regmbc('A'); regmbc('\300'); regmbc('\301');
751 regmbc('\302'); regmbc('\303'); regmbc('\304');
752 regmbc('\305');
753 return;
754 case 'C': case '\307':
755 regmbc('C'); regmbc('\307');
756 return;
757 case 'E': case '\310': case '\311': case '\312': case '\313':
758 regmbc('E'); regmbc('\310'); regmbc('\311');
759 regmbc('\312'); regmbc('\313');
760 return;
761 case 'I': case '\314': case '\315': case '\316': case '\317':
762 regmbc('I'); regmbc('\314'); regmbc('\315');
763 regmbc('\316'); regmbc('\317');
764 return;
765 case 'N': case '\321':
766 regmbc('N'); regmbc('\321');
767 return;
768 case 'O': case '\322': case '\323': case '\324': case '\325':
769 case '\326':
770 regmbc('O'); regmbc('\322'); regmbc('\323');
771 regmbc('\324'); regmbc('\325'); regmbc('\326');
772 return;
773 case 'U': case '\331': case '\332': case '\333': case '\334':
774 regmbc('U'); regmbc('\331'); regmbc('\332');
775 regmbc('\333'); regmbc('\334');
776 return;
777 case 'Y': case '\335':
778 regmbc('Y'); regmbc('\335');
779 return;
780 case 'a': case '\340': case '\341': case '\342':
781 case '\343': case '\344': case '\345':
782 regmbc('a'); regmbc('\340'); regmbc('\341');
783 regmbc('\342'); regmbc('\343'); regmbc('\344');
784 regmbc('\345');
785 return;
786 case 'c': case '\347':
787 regmbc('c'); regmbc('\347');
788 return;
789 case 'e': case '\350': case '\351': case '\352': case '\353':
790 regmbc('e'); regmbc('\350'); regmbc('\351');
791 regmbc('\352'); regmbc('\353');
792 return;
793 case 'i': case '\354': case '\355': case '\356': case '\357':
794 regmbc('i'); regmbc('\354'); regmbc('\355');
795 regmbc('\356'); regmbc('\357');
796 return;
797 case 'n': case '\361':
798 regmbc('n'); regmbc('\361');
799 return;
800 case 'o': case '\362': case '\363': case '\364': case '\365':
801 case '\366':
802 regmbc('o'); regmbc('\362'); regmbc('\363');
803 regmbc('\364'); regmbc('\365'); regmbc('\366');
804 return;
805 case 'u': case '\371': case '\372': case '\373': case '\374':
806 regmbc('u'); regmbc('\371'); regmbc('\372');
807 regmbc('\373'); regmbc('\374');
808 return;
809 case 'y': case '\375': case '\377':
810 regmbc('y'); regmbc('\375'); regmbc('\377');
811 return;
812 }
813 }
814 regmbc(c);
815 }
816
817 /*
818 * Check for a collating element "[.a.]". "pp" points to the '['.
819 * Returns a character. Zero means that no item was recognized. Otherwise
820 * "pp" is advanced to after the item.
821 * Currently only single characters are recognized!
822 */
823 static int
824 get_coll_element(pp)
825 char_u **pp;
826 {
827 int c;
828 int l = 1;
829 char_u *p = *pp;
830
831 if (p[1] == '.')
832 {
833 #ifdef FEAT_MBYTE
834 if (has_mbyte)
835 l = (*mb_ptr2len)(p + 2);
836 #endif
837 if (p[l + 2] == '.' && p[l + 3] == ']')
838 {
839 #ifdef FEAT_MBYTE
840 if (has_mbyte)
841 c = mb_ptr2char(p + 2);
842 else
843 #endif
844 c = p[2];
845 *pp += l + 4;
846 return c;
847 }
848 }
849 return 0;
850 }
851
852
853 /*
854 * Skip over a "[]" range.
855 * "p" must point to the character after the '['.
856 * The returned pointer is on the matching ']', or the terminating NUL.
857 */
858 static char_u *
859 skip_anyof(p)
860 char_u *p;
861 {
862 int cpo_lit; /* 'cpoptions' contains 'l' flag */
863 int cpo_bsl; /* 'cpoptions' contains '\' flag */
864 #ifdef FEAT_MBYTE
865 int l;
866 #endif
867
868 cpo_lit = vim_strchr(p_cpo, CPO_LITERAL) != NULL;
869 cpo_bsl = vim_strchr(p_cpo, CPO_BACKSL) != NULL;
870
871 if (*p == '^') /* Complement of range. */
872 ++p;
873 if (*p == ']' || *p == '-')
874 ++p;
875 while (*p != NUL && *p != ']')
876 {
877 #ifdef FEAT_MBYTE
878 if (has_mbyte && (l = (*mb_ptr2len)(p)) > 1)
879 p += l;
880 else
881 #endif
882 if (*p == '-')
883 {
884 ++p;
885 if (*p != ']' && *p != NUL)
886 mb_ptr_adv(p);
887 }
888 else if (*p == '\\'
889 && !cpo_bsl
890 && (vim_strchr(REGEXP_INRANGE, p[1]) != NULL
891 || (!cpo_lit && vim_strchr(REGEXP_ABBR, p[1]) != NULL)))
892 p += 2;
893 else if (*p == '[')
894 {
895 if (get_char_class(&p) == CLASS_NONE
896 && get_equi_class(&p) == 0
897 && get_coll_element(&p) == 0)
898 ++p; /* It was not a class name */
899 }
900 else
901 ++p;
902 }
903
904 return p;
905 }
906
907 /*
908 * Skip past regular expression.
909 * Stop at end of "startp" or where "dirc" is found ('/', '?', etc).
910 * Take care of characters with a backslash in front of it.
911 * Skip strings inside [ and ].
912 * When "newp" is not NULL and "dirc" is '?', make an allocated copy of the
913 * expression and change "\?" to "?". If "*newp" is not NULL the expression
914 * is changed in-place.
915 */
916 char_u *
917 skip_regexp(startp, dirc, magic, newp)
918 char_u *startp;
919 int dirc;
920 int magic;
921 char_u **newp;
922 {
923 int mymagic;
924 char_u *p = startp;
925
926 if (magic)
927 mymagic = MAGIC_ON;
928 else
929 mymagic = MAGIC_OFF;
930
931 for (; p[0] != NUL; mb_ptr_adv(p))
932 {
933 if (p[0] == dirc) /* found end of regexp */
934 break;
935 if ((p[0] == '[' && mymagic >= MAGIC_ON)
936 || (p[0] == '\\' && p[1] == '[' && mymagic <= MAGIC_OFF))
937 {
938 p = skip_anyof(p + 1);
939 if (p[0] == NUL)
940 break;
941 }
942 else if (p[0] == '\\' && p[1] != NUL)
943 {
944 if (dirc == '?' && newp != NULL && p[1] == '?')
945 {
946 /* change "\?" to "?", make a copy first. */
947 if (*newp == NULL)
948 {
949 *newp = vim_strsave(startp);
950 if (*newp != NULL)
951 p = *newp + (p - startp);
952 }
953 if (*newp != NULL)
954 STRMOVE(p, p + 1);
955 else
956 ++p;
957 }
958 else
959 ++p; /* skip next character */
960 if (*p == 'v')
961 mymagic = MAGIC_ALL;
962 else if (*p == 'V')
963 mymagic = MAGIC_NONE;
964 }
965 }
966 return p;
967 }
968
969 /*
970 * vim_regcomp() - compile a regular expression into internal code
971 * Returns the program in allocated space. Returns NULL for an error.
972 *
973 * We can't allocate space until we know how big the compiled form will be,
974 * but we can't compile it (and thus know how big it is) until we've got a
975 * place to put the code. So we cheat: we compile it twice, once with code
976 * generation turned off and size counting turned on, and once "for real".
977 * This also means that we don't allocate space until we are sure that the
978 * thing really will compile successfully, and we never have to move the
979 * code and thus invalidate pointers into it. (Note that it has to be in
980 * one piece because vim_free() must be able to free it all.)
981 *
982 * Whether upper/lower case is to be ignored is decided when executing the
983 * program, it does not matter here.
984 *
985 * Beware that the optimization-preparation code in here knows about some
986 * of the structure of the compiled regexp.
987 * "re_flags": RE_MAGIC and/or RE_STRING.
988 */
989 regprog_T *
990 vim_regcomp(expr, re_flags)
991 char_u *expr;
992 int re_flags;
993 {
994 regprog_T *r;
995 char_u *scan;
996 char_u *longest;
997 int len;
998 int flags;
999
1000 if (expr == NULL)
1001 EMSG_RET_NULL(_(e_null));
1002
1003 init_class_tab();
1004
1005 /*
1006 * First pass: determine size, legality.
1007 */
1008 regcomp_start(expr, re_flags);
1009 regcode = JUST_CALC_SIZE;
1010 regc(REGMAGIC);
1011 if (reg(REG_NOPAREN, &flags) == NULL)
1012 return NULL;
1013
1014 /* Small enough for pointer-storage convention? */
1015 #ifdef SMALL_MALLOC /* 16 bit storage allocation */
1016 if (regsize >= 65536L - 256L)
1017 EMSG_RET_NULL(_("E339: Pattern too long"));
1018 #endif
1019
1020 /* Allocate space. */
1021 r = (regprog_T *)lalloc(sizeof(regprog_T) + regsize, TRUE);
1022 if (r == NULL)
1023 return NULL;
1024
1025 /*
1026 * Second pass: emit code.
1027 */
1028 regcomp_start(expr, re_flags);
1029 regcode = r->program;
1030 regc(REGMAGIC);
1031 if (reg(REG_NOPAREN, &flags) == NULL)
1032 {
1033 vim_free(r);
1034 return NULL;
1035 }
1036
1037 /* Dig out information for optimizations. */
1038 r->regstart = NUL; /* Worst-case defaults. */
1039 r->reganch = 0;
1040 r->regmust = NULL;
1041 r->regmlen = 0;
1042 r->regflags = regflags;
1043 if (flags & HASNL)
1044 r->regflags |= RF_HASNL;
1045 if (flags & HASLOOKBH)
1046 r->regflags |= RF_LOOKBH;
1047 #ifdef FEAT_SYN_HL
1048 /* Remember whether this pattern has any \z specials in it. */
1049 r->reghasz = re_has_z;
1050 #endif
1051 scan = r->program + 1; /* First BRANCH. */
1052 if (OP(regnext(scan)) == END) /* Only one top-level choice. */
1053 {
1054 scan = OPERAND(scan);
1055
1056 /* Starting-point info. */
1057 if (OP(scan) == BOL || OP(scan) == RE_BOF)
1058 {
1059 r->reganch++;
1060 scan = regnext(scan);
1061 }
1062
1063 if (OP(scan) == EXACTLY)
1064 {
1065 #ifdef FEAT_MBYTE
1066 if (has_mbyte)
1067 r->regstart = (*mb_ptr2char)(OPERAND(scan));
1068 else
1069 #endif
1070 r->regstart = *OPERAND(scan);
1071 }
1072 else if ((OP(scan) == BOW
1073 || OP(scan) == EOW
1074 || OP(scan) == NOTHING
1075 || OP(scan) == MOPEN + 0 || OP(scan) == NOPEN
1076 || OP(scan) == MCLOSE + 0 || OP(scan) == NCLOSE)
1077 && OP(regnext(scan)) == EXACTLY)
1078 {
1079 #ifdef FEAT_MBYTE
1080 if (has_mbyte)
1081 r->regstart = (*mb_ptr2char)(OPERAND(regnext(scan)));
1082 else
1083 #endif
1084 r->regstart = *OPERAND(regnext(scan));
1085 }
1086
1087 /*
1088 * If there's something expensive in the r.e., find the longest
1089 * literal string that must appear and make it the regmust. Resolve
1090 * ties in favor of later strings, since the regstart check works
1091 * with the beginning of the r.e. and avoiding duplication
1092 * strengthens checking. Not a strong reason, but sufficient in the
1093 * absence of others.
1094 */
1095 /*
1096 * When the r.e. starts with BOW, it is faster to look for a regmust
1097 * first. Used a lot for "#" and "*" commands. (Added by mool).
1098 */
1099 if ((flags & SPSTART || OP(scan) == BOW || OP(scan) == EOW)
1100 && !(flags & HASNL))
1101 {
1102 longest = NULL;
1103 len = 0;
1104 for (; scan != NULL; scan = regnext(scan))
1105 if (OP(scan) == EXACTLY && STRLEN(OPERAND(scan)) >= (size_t)len)
1106 {
1107 longest = OPERAND(scan);
1108 len = (int)STRLEN(OPERAND(scan));
1109 }
1110 r->regmust = longest;
1111 r->regmlen = len;
1112 }
1113 }
1114 #ifdef DEBUG
1115 regdump(expr, r);
1116 #endif
1117 return r;
1118 }
1119
1120 /*
1121 * Setup to parse the regexp. Used once to get the length and once to do it.
1122 */
1123 static void
1124 regcomp_start(expr, re_flags)
1125 char_u *expr;
1126 int re_flags; /* see vim_regcomp() */
1127 {
1128 initchr(expr);
1129 if (re_flags & RE_MAGIC)
1130 reg_magic = MAGIC_ON;
1131 else
1132 reg_magic = MAGIC_OFF;
1133 reg_string = (re_flags & RE_STRING);
1134 reg_strict = (re_flags & RE_STRICT);
1135
1136 num_complex_braces = 0;
1137 regnpar = 1;
1138 vim_memset(had_endbrace, 0, sizeof(had_endbrace));
1139 #ifdef FEAT_SYN_HL
1140 regnzpar = 1;
1141 re_has_z = 0;
1142 #endif
1143 regsize = 0L;
1144 regflags = 0;
1145 #if defined(FEAT_SYN_HL) || defined(PROTO)
1146 had_eol = FALSE;
1147 #endif
1148 }
1149
1150 #if defined(FEAT_SYN_HL) || defined(PROTO)
1151 /*
1152 * Check if during the previous call to vim_regcomp the EOL item "$" has been
1153 * found. This is messy, but it works fine.
1154 */
1155 int
1156 vim_regcomp_had_eol()
1157 {
1158 return had_eol;
1159 }
1160 #endif
1161
1162 /*
1163 * reg - regular expression, i.e. main body or parenthesized thing
1164 *
1165 * Caller must absorb opening parenthesis.
1166 *
1167 * Combining parenthesis handling with the base level of regular expression
1168 * is a trifle forced, but the need to tie the tails of the branches to what
1169 * follows makes it hard to avoid.
1170 */
1171 static char_u *
1172 reg(paren, flagp)
1173 int paren; /* REG_NOPAREN, REG_PAREN, REG_NPAREN or REG_ZPAREN */
1174 int *flagp;
1175 {
1176 char_u *ret;
1177 char_u *br;
1178 char_u *ender;
1179 int parno = 0;
1180 int flags;
1181
1182 *flagp = HASWIDTH; /* Tentatively. */
1183
1184 #ifdef FEAT_SYN_HL
1185 if (paren == REG_ZPAREN)
1186 {
1187 /* Make a ZOPEN node. */
1188 if (regnzpar >= NSUBEXP)
1189 EMSG_RET_NULL(_("E50: Too many \\z("));
1190 parno = regnzpar;
1191 regnzpar++;
1192 ret = regnode(ZOPEN + parno);
1193 }
1194 else
1195 #endif
1196 if (paren == REG_PAREN)
1197 {
1198 /* Make a MOPEN node. */
1199 if (regnpar >= NSUBEXP)
1200 EMSG_M_RET_NULL(_("E51: Too many %s("), reg_magic == MAGIC_ALL);
1201 parno = regnpar;
1202 ++regnpar;
1203 ret = regnode(MOPEN + parno);
1204 }
1205 else if (paren == REG_NPAREN)
1206 {
1207 /* Make a NOPEN node. */
1208 ret = regnode(NOPEN);
1209 }
1210 else
1211 ret = NULL;
1212
1213 /* Pick up the branches, linking them together. */
1214 br = regbranch(&flags);
1215 if (br == NULL)
1216 return NULL;
1217 if (ret != NULL)
1218 regtail(ret, br); /* [MZ]OPEN -> first. */
1219 else
1220 ret = br;
1221 /* If one of the branches can be zero-width, the whole thing can.
1222 * If one of the branches has * at start or matches a line-break, the
1223 * whole thing can. */
1224 if (!(flags & HASWIDTH))
1225 *flagp &= ~HASWIDTH;
1226 *flagp |= flags & (SPSTART | HASNL | HASLOOKBH);
1227 while (peekchr() == Magic('|'))
1228 {
1229 skipchr();
1230 br = regbranch(&flags);
1231 if (br == NULL)
1232 return NULL;
1233 regtail(ret, br); /* BRANCH -> BRANCH. */
1234 if (!(flags & HASWIDTH))
1235 *flagp &= ~HASWIDTH;
1236 *flagp |= flags & (SPSTART | HASNL | HASLOOKBH);
1237 }
1238
1239 /* Make a closing node, and hook it on the end. */
1240 ender = regnode(
1241 #ifdef FEAT_SYN_HL
1242 paren == REG_ZPAREN ? ZCLOSE + parno :
1243 #endif
1244 paren == REG_PAREN ? MCLOSE + parno :
1245 paren == REG_NPAREN ? NCLOSE : END);
1246 regtail(ret, ender);
1247
1248 /* Hook the tails of the branches to the closing node. */
1249 for (br = ret; br != NULL; br = regnext(br))
1250 regoptail(br, ender);
1251
1252 /* Check for proper termination. */
1253 if (paren != REG_NOPAREN && getchr() != Magic(')'))
1254 {
1255 #ifdef FEAT_SYN_HL
1256 if (paren == REG_ZPAREN)
1257 EMSG_RET_NULL(_("E52: Unmatched \\z("));
1258 else
1259 #endif
1260 if (paren == REG_NPAREN)
1261 EMSG_M_RET_NULL(_("E53: Unmatched %s%%("), reg_magic == MAGIC_ALL);
1262 else
1263 EMSG_M_RET_NULL(_("E54: Unmatched %s("), reg_magic == MAGIC_ALL);
1264 }
1265 else if (paren == REG_NOPAREN && peekchr() != NUL)
1266 {
1267 if (curchr == Magic(')'))
1268 EMSG_M_RET_NULL(_("E55: Unmatched %s)"), reg_magic == MAGIC_ALL);
1269 else
1270 EMSG_RET_NULL(_(e_trailing)); /* "Can't happen". */
1271 /* NOTREACHED */
1272 }
1273 /*
1274 * Here we set the flag allowing back references to this set of
1275 * parentheses.
1276 */
1277 if (paren == REG_PAREN)
1278 had_endbrace[parno] = TRUE; /* have seen the close paren */
1279 return ret;
1280 }
1281
1282 /*
1283 * Handle one alternative of an | operator.
1284 * Implements the & operator.
1285 */
1286 static char_u *
1287 regbranch(flagp)
1288 int *flagp;
1289 {
1290 char_u *ret;
1291 char_u *chain = NULL;
1292 char_u *latest;
1293 int flags;
1294
1295 *flagp = WORST | HASNL; /* Tentatively. */
1296
1297 ret = regnode(BRANCH);
1298 for (;;)
1299 {
1300 latest = regconcat(&flags);
1301 if (latest == NULL)
1302 return NULL;
1303 /* If one of the branches has width, the whole thing has. If one of
1304 * the branches anchors at start-of-line, the whole thing does.
1305 * If one of the branches uses look-behind, the whole thing does. */
1306 *flagp |= flags & (HASWIDTH | SPSTART | HASLOOKBH);
1307 /* If one of the branches doesn't match a line-break, the whole thing
1308 * doesn't. */
1309 *flagp &= ~HASNL | (flags & HASNL);
1310 if (chain != NULL)
1311 regtail(chain, latest);
1312 if (peekchr() != Magic('&'))
1313 break;
1314 skipchr();
1315 regtail(latest, regnode(END)); /* operand ends */
1316 reginsert(MATCH, latest);
1317 chain = latest;
1318 }
1319
1320 return ret;
1321 }
1322
1323 /*
1324 * Handle one alternative of an | or & operator.
1325 * Implements the concatenation operator.
1326 */
1327 static char_u *
1328 regconcat(flagp)
1329 int *flagp;
1330 {
1331 char_u *first = NULL;
1332 char_u *chain = NULL;
1333 char_u *latest;
1334 int flags;
1335 int cont = TRUE;
1336
1337 *flagp = WORST; /* Tentatively. */
1338
1339 while (cont)
1340 {
1341 switch (peekchr())
1342 {
1343 case NUL:
1344 case Magic('|'):
1345 case Magic('&'):
1346 case Magic(')'):
1347 cont = FALSE;
1348 break;
1349 case Magic('Z'):
1350 #ifdef FEAT_MBYTE
1351 regflags |= RF_ICOMBINE;
1352 #endif
1353 skipchr_keepstart();
1354 break;
1355 case Magic('c'):
1356 regflags |= RF_ICASE;
1357 skipchr_keepstart();
1358 break;
1359 case Magic('C'):
1360 regflags |= RF_NOICASE;
1361 skipchr_keepstart();
1362 break;
1363 case Magic('v'):
1364 reg_magic = MAGIC_ALL;
1365 skipchr_keepstart();
1366 curchr = -1;
1367 break;
1368 case Magic('m'):
1369 reg_magic = MAGIC_ON;
1370 skipchr_keepstart();
1371 curchr = -1;
1372 break;
1373 case Magic('M'):
1374 reg_magic = MAGIC_OFF;
1375 skipchr_keepstart();
1376 curchr = -1;
1377 break;
1378 case Magic('V'):
1379 reg_magic = MAGIC_NONE;
1380 skipchr_keepstart();
1381 curchr = -1;
1382 break;
1383 default:
1384 latest = regpiece(&flags);
1385 if (latest == NULL)
1386 return NULL;
1387 *flagp |= flags & (HASWIDTH | HASNL | HASLOOKBH);
1388 if (chain == NULL) /* First piece. */
1389 *flagp |= flags & SPSTART;
1390 else
1391 regtail(chain, latest);
1392 chain = latest;
1393 if (first == NULL)
1394 first = latest;
1395 break;
1396 }
1397 }
1398 if (first == NULL) /* Loop ran zero times. */
1399 first = regnode(NOTHING);
1400 return first;
1401 }
1402
1403 /*
1404 * regpiece - something followed by possible [*+=]
1405 *
1406 * Note that the branching code sequences used for = and the general cases
1407 * of * and + are somewhat optimized: they use the same NOTHING node as
1408 * both the endmarker for their branch list and the body of the last branch.
1409 * It might seem that this node could be dispensed with entirely, but the
1410 * endmarker role is not redundant.
1411 */
1412 static char_u *
1413 regpiece(flagp)
1414 int *flagp;
1415 {
1416 char_u *ret;
1417 int op;
1418 char_u *next;
1419 int flags;
1420 long minval;
1421 long maxval;
1422
1423 ret = regatom(&flags);
1424 if (ret == NULL)
1425 return NULL;
1426
1427 op = peekchr();
1428 if (re_multi_type(op) == NOT_MULTI)
1429 {
1430 *flagp = flags;
1431 return ret;
1432 }
1433 /* default flags */
1434 *flagp = (WORST | SPSTART | (flags & (HASNL | HASLOOKBH)));
1435
1436 skipchr();
1437 switch (op)
1438 {
1439 case Magic('*'):
1440 if (flags & SIMPLE)
1441 reginsert(STAR, ret);
1442 else
1443 {
1444 /* Emit x* as (x&|), where & means "self". */
1445 reginsert(BRANCH, ret); /* Either x */
1446 regoptail(ret, regnode(BACK)); /* and loop */
1447 regoptail(ret, ret); /* back */
1448 regtail(ret, regnode(BRANCH)); /* or */
1449 regtail(ret, regnode(NOTHING)); /* null. */
1450 }
1451 break;
1452
1453 case Magic('+'):
1454 if (flags & SIMPLE)
1455 reginsert(PLUS, ret);
1456 else
1457 {
1458 /* Emit x+ as x(&|), where & means "self". */
1459 next = regnode(BRANCH); /* Either */
1460 regtail(ret, next);
1461 regtail(regnode(BACK), ret); /* loop back */
1462 regtail(next, regnode(BRANCH)); /* or */
1463 regtail(ret, regnode(NOTHING)); /* null. */
1464 }
1465 *flagp = (WORST | HASWIDTH | (flags & (HASNL | HASLOOKBH)));
1466 break;
1467
1468 case Magic('@'):
1469 {
1470 int lop = END;
1471
1472 switch (no_Magic(getchr()))
1473 {
1474 case '=': lop = MATCH; break; /* \@= */
1475 case '!': lop = NOMATCH; break; /* \@! */
1476 case '>': lop = SUBPAT; break; /* \@> */
1477 case '<': switch (no_Magic(getchr()))
1478 {
1479 case '=': lop = BEHIND; break; /* \@<= */
1480 case '!': lop = NOBEHIND; break; /* \@<! */
1481 }
1482 }
1483 if (lop == END)
1484 EMSG_M_RET_NULL(_("E59: invalid character after %s@"),
1485 reg_magic == MAGIC_ALL);
1486 /* Look behind must match with behind_pos. */
1487 if (lop == BEHIND || lop == NOBEHIND)
1488 {
1489 regtail(ret, regnode(BHPOS));
1490 *flagp |= HASLOOKBH;
1491 }
1492 regtail(ret, regnode(END)); /* operand ends */
1493 reginsert(lop, ret);
1494 break;
1495 }
1496
1497 case Magic('?'):
1498 case Magic('='):
1499 /* Emit x= as (x|) */
1500 reginsert(BRANCH, ret); /* Either x */
1501 regtail(ret, regnode(BRANCH)); /* or */
1502 next = regnode(NOTHING); /* null. */
1503 regtail(ret, next);
1504 regoptail(ret, next);
1505 break;
1506
1507 case Magic('{'):
1508 if (!read_limits(&minval, &maxval))
1509 return NULL;
1510 if (flags & SIMPLE)
1511 {
1512 reginsert(BRACE_SIMPLE, ret);
1513 reginsert_limits(BRACE_LIMITS, minval, maxval, ret);
1514 }
1515 else
1516 {
1517 if (num_complex_braces >= 10)
1518 EMSG_M_RET_NULL(_("E60: Too many complex %s{...}s"),
1519 reg_magic == MAGIC_ALL);
1520 reginsert(BRACE_COMPLEX + num_complex_braces, ret);
1521 regoptail(ret, regnode(BACK));
1522 regoptail(ret, ret);
1523 reginsert_limits(BRACE_LIMITS, minval, maxval, ret);
1524 ++num_complex_braces;
1525 }
1526 if (minval > 0 && maxval > 0)
1527 *flagp = (HASWIDTH | (flags & (HASNL | HASLOOKBH)));
1528 break;
1529 }
1530 if (re_multi_type(peekchr()) != NOT_MULTI)
1531 {
1532 /* Can't have a multi follow a multi. */
1533 if (peekchr() == Magic('*'))
1534 sprintf((char *)IObuff, _("E61: Nested %s*"),
1535 reg_magic >= MAGIC_ON ? "" : "\\");
1536 else
1537 sprintf((char *)IObuff, _("E62: Nested %s%c"),
1538 reg_magic == MAGIC_ALL ? "" : "\\", no_Magic(peekchr()));
1539 EMSG_RET_NULL(IObuff);
1540 }
1541
1542 return ret;
1543 }
1544
1545 /*
1546 * regatom - the lowest level
1547 *
1548 * Optimization: gobbles an entire sequence of ordinary characters so that
1549 * it can turn them into a single node, which is smaller to store and
1550 * faster to run. Don't do this when one_exactly is set.
1551 */
1552 static char_u *
1553 regatom(flagp)
1554 int *flagp;
1555 {
1556 char_u *ret;
1557 int flags;
1558 int cpo_lit; /* 'cpoptions' contains 'l' flag */
1559 int cpo_bsl; /* 'cpoptions' contains '\' flag */
1560 int c;
1561 static char_u *classchars = (char_u *)".iIkKfFpPsSdDxXoOwWhHaAlLuU";
1562 static int classcodes[] = {ANY, IDENT, SIDENT, KWORD, SKWORD,
1563 FNAME, SFNAME, PRINT, SPRINT,
1564 WHITE, NWHITE, DIGIT, NDIGIT,
1565 HEX, NHEX, OCTAL, NOCTAL,
1566 WORD, NWORD, HEAD, NHEAD,
1567 ALPHA, NALPHA, LOWER, NLOWER,
1568 UPPER, NUPPER
1569 };
1570 char_u *p;
1571 int extra = 0;
1572
1573 *flagp = WORST; /* Tentatively. */
1574 cpo_lit = vim_strchr(p_cpo, CPO_LITERAL) != NULL;
1575 cpo_bsl = vim_strchr(p_cpo, CPO_BACKSL) != NULL;
1576
1577 c = getchr();
1578 switch (c)
1579 {
1580 case Magic('^'):
1581 ret = regnode(BOL);
1582 break;
1583
1584 case Magic('$'):
1585 ret = regnode(EOL);
1586 #if defined(FEAT_SYN_HL) || defined(PROTO)
1587 had_eol = TRUE;
1588 #endif
1589 break;
1590
1591 case Magic('<'):
1592 ret = regnode(BOW);
1593 break;
1594
1595 case Magic('>'):
1596 ret = regnode(EOW);
1597 break;
1598
1599 case Magic('_'):
1600 c = no_Magic(getchr());
1601 if (c == '^') /* "\_^" is start-of-line */
1602 {
1603 ret = regnode(BOL);
1604 break;
1605 }
1606 if (c == '$') /* "\_$" is end-of-line */
1607 {
1608 ret = regnode(EOL);
1609 #if defined(FEAT_SYN_HL) || defined(PROTO)
1610 had_eol = TRUE;
1611 #endif
1612 break;
1613 }
1614
1615 extra = ADD_NL;
1616 *flagp |= HASNL;
1617
1618 /* "\_[" is character range plus newline */
1619 if (c == '[')
1620 goto collection;
1621
1622 /* "\_x" is character class plus newline */
1623 /*FALLTHROUGH*/
1624
1625 /*
1626 * Character classes.
1627 */
1628 case Magic('.'):
1629 case Magic('i'):
1630 case Magic('I'):
1631 case Magic('k'):
1632 case Magic('K'):
1633 case Magic('f'):
1634 case Magic('F'):
1635 case Magic('p'):
1636 case Magic('P'):
1637 case Magic('s'):
1638 case Magic('S'):
1639 case Magic('d'):
1640 case Magic('D'):
1641 case Magic('x'):
1642 case Magic('X'):
1643 case Magic('o'):
1644 case Magic('O'):
1645 case Magic('w'):
1646 case Magic('W'):
1647 case Magic('h'):
1648 case Magic('H'):
1649 case Magic('a'):
1650 case Magic('A'):
1651 case Magic('l'):
1652 case Magic('L'):
1653 case Magic('u'):
1654 case Magic('U'):
1655 p = vim_strchr(classchars, no_Magic(c));
1656 if (p == NULL)
1657 EMSG_RET_NULL(_("E63: invalid use of \\_"));
1658 #ifdef FEAT_MBYTE
1659 /* When '.' is followed by a composing char ignore the dot, so that
1660 * the composing char is matched here. */
1661 if (enc_utf8 && c == Magic('.') && utf_iscomposing(peekchr()))
1662 {
1663 c = getchr();
1664 goto do_multibyte;
1665 }
1666 #endif
1667 ret = regnode(classcodes[p - classchars] + extra);
1668 *flagp |= HASWIDTH | SIMPLE;
1669 break;
1670
1671 case Magic('n'):
1672 if (reg_string)
1673 {
1674 /* In a string "\n" matches a newline character. */
1675 ret = regnode(EXACTLY);
1676 regc(NL);
1677 regc(NUL);
1678 *flagp |= HASWIDTH | SIMPLE;
1679 }
1680 else
1681 {
1682 /* In buffer text "\n" matches the end of a line. */
1683 ret = regnode(NEWL);
1684 *flagp |= HASWIDTH | HASNL;
1685 }
1686 break;
1687
1688 case Magic('('):
1689 if (one_exactly)
1690 EMSG_ONE_RET_NULL;
1691 ret = reg(REG_PAREN, &flags);
1692 if (ret == NULL)
1693 return NULL;
1694 *flagp |= flags & (HASWIDTH | SPSTART | HASNL | HASLOOKBH);
1695 break;
1696
1697 case NUL:
1698 case Magic('|'):
1699 case Magic('&'):
1700 case Magic(')'):
1701 if (one_exactly)
1702 EMSG_ONE_RET_NULL;
1703 EMSG_RET_NULL(_(e_internal)); /* Supposed to be caught earlier. */
1704 /* NOTREACHED */
1705
1706 case Magic('='):
1707 case Magic('?'):
1708 case Magic('+'):
1709 case Magic('@'):
1710 case Magic('{'):
1711 case Magic('*'):
1712 c = no_Magic(c);
1713 sprintf((char *)IObuff, _("E64: %s%c follows nothing"),
1714 (c == '*' ? reg_magic >= MAGIC_ON : reg_magic == MAGIC_ALL)
1715 ? "" : "\\", c);
1716 EMSG_RET_NULL(IObuff);
1717 /* NOTREACHED */
1718
1719 case Magic('~'): /* previous substitute pattern */
1720 if (reg_prev_sub != NULL)
1721 {
1722 char_u *lp;
1723
1724 ret = regnode(EXACTLY);
1725 lp = reg_prev_sub;
1726 while (*lp != NUL)
1727 regc(*lp++);
1728 regc(NUL);
1729 if (*reg_prev_sub != NUL)
1730 {
1731 *flagp |= HASWIDTH;
1732 if ((lp - reg_prev_sub) == 1)
1733 *flagp |= SIMPLE;
1734 }
1735 }
1736 else
1737 EMSG_RET_NULL(_(e_nopresub));
1738 break;
1739
1740 case Magic('1'):
1741 case Magic('2'):
1742 case Magic('3'):
1743 case Magic('4'):
1744 case Magic('5'):
1745 case Magic('6'):
1746 case Magic('7'):
1747 case Magic('8'):
1748 case Magic('9'):
1749 {
1750 int refnum;
1751
1752 refnum = c - Magic('0');
1753 /*
1754 * Check if the back reference is legal. We must have seen the
1755 * close brace.
1756 * TODO: Should also check that we don't refer to something
1757 * that is repeated (+*=): what instance of the repetition
1758 * should we match?
1759 */
1760 if (!had_endbrace[refnum])
1761 {
1762 /* Trick: check if "@<=" or "@<!" follows, in which case
1763 * the \1 can appear before the referenced match. */
1764 for (p = regparse; *p != NUL; ++p)
1765 if (p[0] == '@' && p[1] == '<'
1766 && (p[2] == '!' || p[2] == '='))
1767 break;
1768 if (*p == NUL)
1769 EMSG_RET_NULL(_("E65: Illegal back reference"));
1770 }
1771 ret = regnode(BACKREF + refnum);
1772 }
1773 break;
1774
1775 case Magic('z'):
1776 {
1777 c = no_Magic(getchr());
1778 switch (c)
1779 {
1780 #ifdef FEAT_SYN_HL
1781 case '(': if (reg_do_extmatch != REX_SET)
1782 EMSG_RET_NULL(_("E66: \\z( not allowed here"));
1783 if (one_exactly)
1784 EMSG_ONE_RET_NULL;
1785 ret = reg(REG_ZPAREN, &flags);
1786 if (ret == NULL)
1787 return NULL;
1788 *flagp |= flags & (HASWIDTH|SPSTART|HASNL|HASLOOKBH);
1789 re_has_z = REX_SET;
1790 break;
1791
1792 case '1':
1793 case '2':
1794 case '3':
1795 case '4':
1796 case '5':
1797 case '6':
1798 case '7':
1799 case '8':
1800 case '9': if (reg_do_extmatch != REX_USE)
1801 EMSG_RET_NULL(_("E67: \\z1 et al. not allowed here"));
1802 ret = regnode(ZREF + c - '0');
1803 re_has_z = REX_USE;
1804 break;
1805 #endif
1806
1807 case 's': ret = regnode(MOPEN + 0);
1808 break;
1809
1810 case 'e': ret = regnode(MCLOSE + 0);
1811 break;
1812
1813 default: EMSG_RET_NULL(_("E68: Invalid character after \\z"));
1814 }
1815 }
1816 break;
1817
1818 case Magic('%'):
1819 {
1820 c = no_Magic(getchr());
1821 switch (c)
1822 {
1823 /* () without a back reference */
1824 case '(':
1825 if (one_exactly)
1826 EMSG_ONE_RET_NULL;
1827 ret = reg(REG_NPAREN, &flags);
1828 if (ret == NULL)
1829 return NULL;
1830 *flagp |= flags & (HASWIDTH | SPSTART | HASNL | HASLOOKBH);
1831 break;
1832
1833 /* Catch \%^ and \%$ regardless of where they appear in the
1834 * pattern -- regardless of whether or not it makes sense. */
1835 case '^':
1836 ret = regnode(RE_BOF);
1837 break;
1838
1839 case '$':
1840 ret = regnode(RE_EOF);
1841 break;
1842
1843 case '#':
1844 ret = regnode(CURSOR);
1845 break;
1846
1847 case 'V':
1848 ret = regnode(RE_VISUAL);
1849 break;
1850
1851 /* \%[abc]: Emit as a list of branches, all ending at the last
1852 * branch which matches nothing. */
1853 case '[':
1854 if (one_exactly) /* doesn't nest */
1855 EMSG_ONE_RET_NULL;
1856 {
1857 char_u *lastbranch;
1858 char_u *lastnode = NULL;
1859 char_u *br;
1860
1861 ret = NULL;
1862 while ((c = getchr()) != ']')
1863 {
1864 if (c == NUL)
1865 EMSG_M_RET_NULL(_("E69: Missing ] after %s%%["),
1866 reg_magic == MAGIC_ALL);
1867 br = regnode(BRANCH);
1868 if (ret == NULL)
1869 ret = br;
1870 else
1871 regtail(lastnode, br);
1872
1873 ungetchr();
1874 one_exactly = TRUE;
1875 lastnode = regatom(flagp);
1876 one_exactly = FALSE;
1877 if (lastnode == NULL)
1878 return NULL;
1879 }
1880 if (ret == NULL)
1881 EMSG_M_RET_NULL(_("E70: Empty %s%%[]"),
1882 reg_magic == MAGIC_ALL);
1883 lastbranch = regnode(BRANCH);
1884 br = regnode(NOTHING);
1885 if (ret != JUST_CALC_SIZE)
1886 {
1887 regtail(lastnode, br);
1888 regtail(lastbranch, br);
1889 /* connect all branches to the NOTHING
1890 * branch at the end */
1891 for (br = ret; br != lastnode; )
1892 {
1893 if (OP(br) == BRANCH)
1894 {
1895 regtail(br, lastbranch);
1896 br = OPERAND(br);
1897 }
1898 else
1899 br = regnext(br);
1900 }
1901 }
1902 *flagp &= ~(HASWIDTH | SIMPLE);
1903 break;
1904 }
1905
1906 case 'd': /* %d123 decimal */
1907 case 'o': /* %o123 octal */
1908 case 'x': /* %xab hex 2 */
1909 case 'u': /* %uabcd hex 4 */
1910 case 'U': /* %U1234abcd hex 8 */
1911 {
1912 int i;
1913
1914 switch (c)
1915 {
1916 case 'd': i = getdecchrs(); break;
1917 case 'o': i = getoctchrs(); break;
1918 case 'x': i = gethexchrs(2); break;
1919 case 'u': i = gethexchrs(4); break;
1920 case 'U': i = gethexchrs(8); break;
1921 default: i = -1; break;
1922 }
1923
1924 if (i < 0)
1925 EMSG_M_RET_NULL(
1926 _("E678: Invalid character after %s%%[dxouU]"),
1927 reg_magic == MAGIC_ALL);
1928 #ifdef FEAT_MBYTE
1929 if (use_multibytecode(i))
1930 ret = regnode(MULTIBYTECODE);
1931 else
1932 #endif
1933 ret = regnode(EXACTLY);
1934 if (i == 0)
1935 regc(0x0a);
1936 else
1937 #ifdef FEAT_MBYTE
1938 regmbc(i);
1939 #else
1940 regc(i);
1941 #endif
1942 regc(NUL);
1943 *flagp |= HASWIDTH;
1944 break;
1945 }
1946
1947 default:
1948 if (VIM_ISDIGIT(c) || c == '<' || c == '>'
1949 || c == '\'')
1950 {
1951 long_u n = 0;
1952 int cmp;
1953
1954 cmp = c;
1955 if (cmp == '<' || cmp == '>')
1956 c = getchr();
1957 while (VIM_ISDIGIT(c))
1958 {
1959 n = n * 10 + (c - '0');
1960 c = getchr();
1961 }
1962 if (c == '\'' && n == 0)
1963 {
1964 /* "\%'m", "\%<'m" and "\%>'m": Mark */
1965 c = getchr();
1966 ret = regnode(RE_MARK);
1967 if (ret == JUST_CALC_SIZE)
1968 regsize += 2;
1969 else
1970 {
1971 *regcode++ = c;
1972 *regcode++ = cmp;
1973 }
1974 break;
1975 }
1976 else if (c == 'l' || c == 'c' || c == 'v')
1977 {
1978 if (c == 'l')
1979 ret = regnode(RE_LNUM);
1980 else if (c == 'c')
1981 ret = regnode(RE_COL);
1982 else
1983 ret = regnode(RE_VCOL);
1984 if (ret == JUST_CALC_SIZE)
1985 regsize += 5;
1986 else
1987 {
1988 /* put the number and the optional
1989 * comparator after the opcode */
1990 regcode = re_put_long(regcode, n);
1991 *regcode++ = cmp;
1992 }
1993 break;
1994 }
1995 }
1996
1997 EMSG_M_RET_NULL(_("E71: Invalid character after %s%%"),
1998 reg_magic == MAGIC_ALL);
1999 }
2000 }
2001 break;
2002
2003 case Magic('['):
2004 collection:
2005 {
2006 char_u *lp;
2007
2008 /*
2009 * If there is no matching ']', we assume the '[' is a normal
2010 * character. This makes 'incsearch' and ":help [" work.
2011 */
2012 lp = skip_anyof(regparse);
2013 if (*lp == ']') /* there is a matching ']' */
2014 {
2015 int startc = -1; /* > 0 when next '-' is a range */
2016 int endc;
2017
2018 /*
2019 * In a character class, different parsing rules apply.
2020 * Not even \ is special anymore, nothing is.
2021 */
2022 if (*regparse == '^') /* Complement of range. */
2023 {
2024 ret = regnode(ANYBUT + extra);
2025 regparse++;
2026 }
2027 else
2028 ret = regnode(ANYOF + extra);
2029
2030 /* At the start ']' and '-' mean the literal character. */
2031 if (*regparse == ']' || *regparse == '-')
2032 {
2033 startc = *regparse;
2034 regc(*regparse++);
2035 }
2036
2037 while (*regparse != NUL && *regparse != ']')
2038 {
2039 if (*regparse == '-')
2040 {
2041 ++regparse;
2042 /* The '-' is not used for a range at the end and
2043 * after or before a '\n'. */
2044 if (*regparse == ']' || *regparse == NUL
2045 || startc == -1
2046 || (regparse[0] == '\\' && regparse[1] == 'n'))
2047 {
2048 regc('-');
2049 startc = '-'; /* [--x] is a range */
2050 }
2051 else
2052 {
2053 /* Also accept "a-[.z.]" */
2054 endc = 0;
2055 if (*regparse == '[')
2056 endc = get_coll_element(&regparse);
2057 if (endc == 0)
2058 {
2059 #ifdef FEAT_MBYTE
2060 if (has_mbyte)
2061 endc = mb_ptr2char_adv(&regparse);
2062 else
2063 #endif
2064 endc = *regparse++;
2065 }
2066
2067 /* Handle \o40, \x20 and \u20AC style sequences */
2068 if (endc == '\\' && !cpo_lit && !cpo_bsl)
2069 endc = coll_get_char();
2070
2071 if (startc > endc)
2072 EMSG_RET_NULL(_(e_invrange));
2073 #ifdef FEAT_MBYTE
2074 if (has_mbyte && ((*mb_char2len)(startc) > 1
2075 || (*mb_char2len)(endc) > 1))
2076 {
2077 /* Limit to a range of 256 chars */
2078 if (endc > startc + 256)
2079 EMSG_RET_NULL(_(e_invrange));
2080 while (++startc <= endc)
2081 regmbc(startc);
2082 }
2083 else
2084 #endif
2085 {
2086 #ifdef EBCDIC
2087 int alpha_only = FALSE;
2088
2089 /* for alphabetical range skip the gaps
2090 * 'i'-'j', 'r'-'s', 'I'-'J' and 'R'-'S'. */
2091 if (isalpha(startc) && isalpha(endc))
2092 alpha_only = TRUE;
2093 #endif
2094 while (++startc <= endc)
2095 #ifdef EBCDIC
2096 if (!alpha_only || isalpha(startc))
2097 #endif
2098 regc(startc);
2099 }
2100 startc = -1;
2101 }
2102 }
2103 /*
2104 * Only "\]", "\^", "\]" and "\\" are special in Vi. Vim
2105 * accepts "\t", "\e", etc., but only when the 'l' flag in
2106 * 'cpoptions' is not included.
2107 * Posix doesn't recognize backslash at all.
2108 */
2109 else if (*regparse == '\\'
2110 && !cpo_bsl
2111 && (vim_strchr(REGEXP_INRANGE, regparse[1]) != NULL
2112 || (!cpo_lit
2113 && vim_strchr(REGEXP_ABBR,
2114 regparse[1]) != NULL)))
2115 {
2116 regparse++;
2117 if (*regparse == 'n')
2118 {
2119 /* '\n' in range: also match NL */
2120 if (ret != JUST_CALC_SIZE)
2121 {
2122 if (*ret == ANYBUT)
2123 *ret = ANYBUT + ADD_NL;
2124 else if (*ret == ANYOF)
2125 *ret = ANYOF + ADD_NL;
2126 /* else: must have had a \n already */
2127 }
2128 *flagp |= HASNL;
2129 regparse++;
2130 startc = -1;
2131 }
2132 else if (*regparse == 'd'
2133 || *regparse == 'o'
2134 || *regparse == 'x'
2135 || *regparse == 'u'
2136 || *regparse == 'U')
2137 {
2138 startc = coll_get_char();
2139 if (startc == 0)
2140 regc(0x0a);
2141 else
2142 #ifdef FEAT_MBYTE
2143 regmbc(startc);
2144 #else
2145 regc(startc);
2146 #endif
2147 }
2148 else
2149 {
2150 startc = backslash_trans(*regparse++);
2151 regc(startc);
2152 }
2153 }
2154 else if (*regparse == '[')
2155 {
2156 int c_class;
2157 int cu;
2158
2159 c_class = get_char_class(&regparse);
2160 startc = -1;
2161 /* Characters assumed to be 8 bits! */
2162 switch (c_class)
2163 {
2164 case CLASS_NONE:
2165 c_class = get_equi_class(&regparse);
2166 if (c_class != 0)
2167 {
2168 /* produce equivalence class */
2169 reg_equi_class(c_class);
2170 }
2171 else if ((c_class =
2172 get_coll_element(&regparse)) != 0)
2173 {
2174 /* produce a collating element */
2175 regmbc(c_class);
2176 }
2177 else
2178 {
2179 /* literal '[', allow [[-x] as a range */
2180 startc = *regparse++;
2181 regc(startc);
2182 }
2183 break;
2184 case CLASS_ALNUM:
2185 for (cu = 1; cu <= 255; cu++)
2186 if (isalnum(cu))
2187 regc(cu);
2188 break;
2189 case CLASS_ALPHA:
2190 for (cu = 1; cu <= 255; cu++)
2191 if (isalpha(cu))
2192 regc(cu);
2193 break;
2194 case CLASS_BLANK:
2195 regc(' ');
2196 regc('\t');
2197 break;
2198 case CLASS_CNTRL:
2199 for (cu = 1; cu <= 255; cu++)
2200 if (iscntrl(cu))
2201 regc(cu);
2202 break;
2203 case CLASS_DIGIT:
2204 for (cu = 1; cu <= 255; cu++)
2205 if (VIM_ISDIGIT(cu))
2206 regc(cu);
2207 break;
2208 case CLASS_GRAPH:
2209 for (cu = 1; cu <= 255; cu++)
2210 if (isgraph(cu))
2211 regc(cu);
2212 break;
2213 case CLASS_LOWER:
2214 for (cu = 1; cu <= 255; cu++)
2215 if (MB_ISLOWER(cu))
2216 regc(cu);
2217 break;
2218 case CLASS_PRINT:
2219 for (cu = 1; cu <= 255; cu++)
2220 if (vim_isprintc(cu))
2221 regc(cu);
2222 break;
2223 case CLASS_PUNCT:
2224 for (cu = 1; cu <= 255; cu++)
2225 if (ispunct(cu))
2226 regc(cu);
2227 break;
2228 case CLASS_SPACE:
2229 for (cu = 9; cu <= 13; cu++)
2230 regc(cu);
2231 regc(' ');
2232 break;
2233 case CLASS_UPPER:
2234 for (cu = 1; cu <= 255; cu++)
2235 if (MB_ISUPPER(cu))
2236 regc(cu);
2237 break;
2238 case CLASS_XDIGIT:
2239 for (cu = 1; cu <= 255; cu++)
2240 if (vim_isxdigit(cu))
2241 regc(cu);
2242 break;
2243 case CLASS_TAB:
2244 regc('\t');
2245 break;
2246 case CLASS_RETURN:
2247 regc('\r');
2248 break;
2249 case CLASS_BACKSPACE:
2250 regc('\b');
2251 break;
2252 case CLASS_ESCAPE:
2253 regc('\033');
2254 break;
2255 }
2256 }
2257 else
2258 {
2259 #ifdef FEAT_MBYTE
2260 if (has_mbyte)
2261 {
2262 int len;
2263
2264 /* produce a multibyte character, including any
2265 * following composing characters */
2266 startc = mb_ptr2char(regparse);
2267 len = (*mb_ptr2len)(regparse);
2268 if (enc_utf8 && utf_char2len(startc) != len)
2269 startc = -1; /* composing chars */
2270 while (--len >= 0)
2271 regc(*regparse++);
2272 }
2273 else
2274 #endif
2275 {
2276 startc = *regparse++;
2277 regc(startc);
2278 }
2279 }
2280 }
2281 regc(NUL);
2282 prevchr_len = 1; /* last char was the ']' */
2283 if (*regparse != ']')
2284 EMSG_RET_NULL(_(e_toomsbra)); /* Cannot happen? */
2285 skipchr(); /* let's be friends with the lexer again */
2286 *flagp |= HASWIDTH | SIMPLE;
2287 break;
2288 }
2289 else if (reg_strict)
2290 EMSG_M_RET_NULL(_("E769: Missing ] after %s["),
2291 reg_magic > MAGIC_OFF);
2292 }
2293 /* FALLTHROUGH */
2294
2295 default:
2296 {
2297 int len;
2298
2299 #ifdef FEAT_MBYTE
2300 /* A multi-byte character is handled as a separate atom if it's
2301 * before a multi and when it's a composing char. */
2302 if (use_multibytecode(c))
2303 {
2304 do_multibyte:
2305 ret = regnode(MULTIBYTECODE);
2306 regmbc(c);
2307 *flagp |= HASWIDTH | SIMPLE;
2308 break;
2309 }
2310 #endif
2311
2312 ret = regnode(EXACTLY);
2313
2314 /*
2315 * Append characters as long as:
2316 * - there is no following multi, we then need the character in
2317 * front of it as a single character operand
2318 * - not running into a Magic character
2319 * - "one_exactly" is not set
2320 * But always emit at least one character. Might be a Multi,
2321 * e.g., a "[" without matching "]".
2322 */
2323 for (len = 0; c != NUL && (len == 0
2324 || (re_multi_type(peekchr()) == NOT_MULTI
2325 && !one_exactly
2326 && !is_Magic(c))); ++len)
2327 {
2328 c = no_Magic(c);
2329 #ifdef FEAT_MBYTE
2330 if (has_mbyte)
2331 {
2332 regmbc(c);
2333 if (enc_utf8)
2334 {
2335 int l;
2336
2337 /* Need to get composing character too. */
2338 for (;;)
2339 {
2340 l = utf_ptr2len(regparse);
2341 if (!UTF_COMPOSINGLIKE(regparse, regparse + l))
2342 break;
2343 regmbc(utf_ptr2char(regparse));
2344 skipchr();
2345 }
2346 }
2347 }
2348 else
2349 #endif
2350 regc(c);
2351 c = getchr();
2352 }
2353 ungetchr();
2354
2355 regc(NUL);
2356 *flagp |= HASWIDTH;
2357 if (len == 1)
2358 *flagp |= SIMPLE;
2359 }
2360 break;
2361 }
2362
2363 return ret;
2364 }
2365
2366 #ifdef FEAT_MBYTE
2367 /*
2368 * Return TRUE if MULTIBYTECODE should be used instead of EXACTLY for
2369 * character "c".
2370 */
2371 static int
2372 use_multibytecode(c)
2373 int c;
2374 {
2375 return has_mbyte && (*mb_char2len)(c) > 1
2376 && (re_multi_type(peekchr()) != NOT_MULTI
2377 || (enc_utf8 && utf_iscomposing(c)));
2378 }
2379 #endif
2380
2381 /*
2382 * emit a node
2383 * Return pointer to generated code.
2384 */
2385 static char_u *
2386 regnode(op)
2387 int op;
2388 {
2389 char_u *ret;
2390
2391 ret = regcode;
2392 if (ret == JUST_CALC_SIZE)
2393 regsize += 3;
2394 else
2395 {
2396 *regcode++ = op;
2397 *regcode++ = NUL; /* Null "next" pointer. */
2398 *regcode++ = NUL;
2399 }
2400 return ret;
2401 }
2402
2403 /*
2404 * Emit (if appropriate) a byte of code
2405 */
2406 static void
2407 regc(b)
2408 int b;
2409 {
2410 if (regcode == JUST_CALC_SIZE)
2411 regsize++;
2412 else
2413 *regcode++ = b;
2414 }
2415
2416 #ifdef FEAT_MBYTE
2417 /*
2418 * Emit (if appropriate) a multi-byte character of code
2419 */
2420 static void
2421 regmbc(c)
2422 int c;
2423 {
2424 if (regcode == JUST_CALC_SIZE)
2425 regsize += (*mb_char2len)(c);
2426 else
2427 regcode += (*mb_char2bytes)(c, regcode);
2428 }
2429 #endif
2430
2431 /*
2432 * reginsert - insert an operator in front of already-emitted operand
2433 *
2434 * Means relocating the operand.
2435 */
2436 static void
2437 reginsert(op, opnd)
2438 int op;
2439 char_u *opnd;
2440 {
2441 char_u *src;
2442 char_u *dst;
2443 char_u *place;
2444
2445 if (regcode == JUST_CALC_SIZE)
2446 {
2447 regsize += 3;
2448 return;
2449 }
2450 src = regcode;
2451 regcode += 3;
2452 dst = regcode;
2453 while (src > opnd)
2454 *--dst = *--src;
2455
2456 place = opnd; /* Op node, where operand used to be. */
2457 *place++ = op;
2458 *place++ = NUL;
2459 *place = NUL;
2460 }
2461
2462 /*
2463 * reginsert_limits - insert an operator in front of already-emitted operand.
2464 * The operator has the given limit values as operands. Also set next pointer.
2465 *
2466 * Means relocating the operand.
2467 */
2468 static void
2469 reginsert_limits(op, minval, maxval, opnd)
2470 int op;
2471 long minval;
2472 long maxval;
2473 char_u *opnd;
2474 {
2475 char_u *src;
2476 char_u *dst;
2477 char_u *place;
2478
2479 if (regcode == JUST_CALC_SIZE)
2480 {
2481 regsize += 11;
2482 return;
2483 }
2484 src = regcode;
2485 regcode += 11;
2486 dst = regcode;
2487 while (src > opnd)
2488 *--dst = *--src;
2489
2490 place = opnd; /* Op node, where operand used to be. */
2491 *place++ = op;
2492 *place++ = NUL;
2493 *place++ = NUL;
2494 place = re_put_long(place, (long_u)minval);
2495 place = re_put_long(place, (long_u)maxval);
2496 regtail(opnd, place);
2497 }
2498
2499 /*
2500 * Write a long as four bytes at "p" and return pointer to the next char.
2501 */
2502 static char_u *
2503 re_put_long(p, val)
2504 char_u *p;
2505 long_u val;
2506 {
2507 *p++ = (char_u) ((val >> 24) & 0377);
2508 *p++ = (char_u) ((val >> 16) & 0377);
2509 *p++ = (char_u) ((val >> 8) & 0377);
2510 *p++ = (char_u) (val & 0377);
2511 return p;
2512 }
2513
2514 /*
2515 * regtail - set the next-pointer at the end of a node chain
2516 */
2517 static void
2518 regtail(p, val)
2519 char_u *p;
2520 char_u *val;
2521 {
2522 char_u *scan;
2523 char_u *temp;
2524 int offset;
2525
2526 if (p == JUST_CALC_SIZE)
2527 return;
2528
2529 /* Find last node. */
2530 scan = p;
2531 for (;;)
2532 {
2533 temp = regnext(scan);
2534 if (temp == NULL)
2535 break;
2536 scan = temp;
2537 }
2538
2539 if (OP(scan) == BACK)
2540 offset = (int)(scan - val);
2541 else
2542 offset = (int)(val - scan);
2543 *(scan + 1) = (char_u) (((unsigned)offset >> 8) & 0377);
2544 *(scan + 2) = (char_u) (offset & 0377);
2545 }
2546
2547 /*
2548 * regoptail - regtail on item after a BRANCH; nop if none
2549 */
2550 static void
2551 regoptail(p, val)
2552 char_u *p;
2553 char_u *val;
2554 {
2555 /* When op is neither BRANCH nor BRACE_COMPLEX0-9, it is "operandless" */
2556 if (p == NULL || p == JUST_CALC_SIZE
2557 || (OP(p) != BRANCH
2558 && (OP(p) < BRACE_COMPLEX || OP(p) > BRACE_COMPLEX + 9)))
2559 return;
2560 regtail(OPERAND(p), val);
2561 }
2562
2563 /*
2564 * getchr() - get the next character from the pattern. We know about
2565 * magic and such, so therefore we need a lexical analyzer.
2566 */
2567
2568 /* static int curchr; */
2569 static int prevprevchr;
2570 static int prevchr;
2571 static int nextchr; /* used for ungetchr() */
2572 /*
2573 * Note: prevchr is sometimes -1 when we are not at the start,
2574 * eg in /[ ^I]^ the pattern was never found even if it existed, because ^ was
2575 * taken to be magic -- webb
2576 */
2577 static int at_start; /* True when on the first character */
2578 static int prev_at_start; /* True when on the second character */
2579
2580 static void
2581 initchr(str)
2582 char_u *str;
2583 {
2584 regparse = str;
2585 prevchr_len = 0;
2586 curchr = prevprevchr = prevchr = nextchr = -1;
2587 at_start = TRUE;
2588 prev_at_start = FALSE;
2589 }
2590
2591 static int
2592 peekchr()
2593 {
2594 static int after_slash = FALSE;
2595
2596 if (curchr == -1)
2597 {
2598 switch (curchr = regparse[0])
2599 {
2600 case '.':
2601 case '[':
2602 case '~':
2603 /* magic when 'magic' is on */
2604 if (reg_magic >= MAGIC_ON)
2605 curchr = Magic(curchr);
2606 break;
2607 case '(':
2608 case ')':
2609 case '{':
2610 case '%':
2611 case '+':
2612 case '=':
2613 case '?':
2614 case '@':
2615 case '!':
2616 case '&':
2617 case '|':
2618 case '<':
2619 case '>':
2620 case '#': /* future ext. */
2621 case '"': /* future ext. */
2622 case '\'': /* future ext. */
2623 case ',': /* future ext. */
2624 case '-': /* future ext. */
2625 case ':': /* future ext. */
2626 case ';': /* future ext. */
2627 case '`': /* future ext. */
2628 case '/': /* Can't be used in / command */
2629 /* magic only after "\v" */
2630 if (reg_magic == MAGIC_ALL)
2631 curchr = Magic(curchr);
2632 break;
2633 case '*':
2634 /* * is not magic as the very first character, eg "?*ptr", when
2635 * after '^', eg "/^*ptr" and when after "\(", "\|", "\&". But
2636 * "\(\*" is not magic, thus must be magic if "after_slash" */
2637 if (reg_magic >= MAGIC_ON
2638 && !at_start
2639 && !(prev_at_start && prevchr == Magic('^'))
2640 && (after_slash
2641 || (prevchr != Magic('(')
2642 && prevchr != Magic('&')
2643 && prevchr != Magic('|'))))
2644 curchr = Magic('*');
2645 break;
2646 case '^':
2647 /* '^' is only magic as the very first character and if it's after
2648 * "\(", "\|", "\&' or "\n" */
2649 if (reg_magic >= MAGIC_OFF
2650 && (at_start
2651 || reg_magic == MAGIC_ALL
2652 || prevchr == Magic('(')
2653 || prevchr == Magic('|')
2654 || prevchr == Magic('&')
2655 || prevchr == Magic('n')
2656 || (no_Magic(prevchr) == '('
2657 && prevprevchr == Magic('%'))))
2658 {
2659 curchr = Magic('^');
2660 at_start = TRUE;
2661 prev_at_start = FALSE;
2662 }
2663 break;
2664 case '$':
2665 /* '$' is only magic as the very last char and if it's in front of
2666 * either "\|", "\)", "\&", or "\n" */
2667 if (reg_magic >= MAGIC_OFF)
2668 {
2669 char_u *p = regparse + 1;
2670
2671 /* ignore \c \C \m and \M after '$' */
2672 while (p[0] == '\\' && (p[1] == 'c' || p[1] == 'C'
2673 || p[1] == 'm' || p[1] == 'M' || p[1] == 'Z'))
2674 p += 2;
2675 if (p[0] == NUL
2676 || (p[0] == '\\'
2677 && (p[1] == '|' || p[1] == '&' || p[1] == ')'
2678 || p[1] == 'n'))
2679 || reg_magic == MAGIC_ALL)
2680 curchr = Magic('$');
2681 }
2682 break;
2683 case '\\':
2684 {
2685 int c = regparse[1];
2686
2687 if (c == NUL)
2688 curchr = '\\'; /* trailing '\' */
2689 else if (
2690 #ifdef EBCDIC
2691 vim_strchr(META, c)
2692 #else
2693 c <= '~' && META_flags[c]
2694 #endif
2695 )
2696 {
2697 /*
2698 * META contains everything that may be magic sometimes,
2699 * except ^ and $ ("\^" and "\$" are only magic after
2700 * "\v"). We now fetch the next character and toggle its
2701 * magicness. Therefore, \ is so meta-magic that it is
2702 * not in META.
2703 */
2704 curchr = -1;
2705 prev_at_start = at_start;
2706 at_start = FALSE; /* be able to say "/\*ptr" */
2707 ++regparse;
2708 ++after_slash;
2709 peekchr();
2710 --regparse;
2711 --after_slash;
2712 curchr = toggle_Magic(curchr);
2713 }
2714 else if (vim_strchr(REGEXP_ABBR, c))
2715 {
2716 /*
2717 * Handle abbreviations, like "\t" for TAB -- webb
2718 */
2719 curchr = backslash_trans(c);
2720 }
2721 else if (reg_magic == MAGIC_NONE && (c == '$' || c == '^'))
2722 curchr = toggle_Magic(c);
2723 else
2724 {
2725 /*
2726 * Next character can never be (made) magic?
2727 * Then backslashing it won't do anything.
2728 */
2729 #ifdef FEAT_MBYTE
2730 if (has_mbyte)
2731 curchr = (*mb_ptr2char)(regparse + 1);
2732 else
2733 #endif
2734 curchr = c;
2735 }
2736 break;
2737 }
2738
2739 #ifdef FEAT_MBYTE
2740 default:
2741 if (has_mbyte)
2742 curchr = (*mb_ptr2char)(regparse);
2743 #endif
2744 }
2745 }
2746
2747 return curchr;
2748 }
2749
2750 /*
2751 * Eat one lexed character. Do this in a way that we can undo it.
2752 */
2753 static void
2754 skipchr()
2755 {
2756 /* peekchr() eats a backslash, do the same here */
2757 if (*regparse == '\\')
2758 prevchr_len = 1;
2759 else
2760 prevchr_len = 0;
2761 if (regparse[prevchr_len] != NUL)
2762 {
2763 #ifdef FEAT_MBYTE
2764 if (enc_utf8)
2765 /* exclude composing chars that mb_ptr2len does include */
2766 prevchr_len += utf_ptr2len(regparse + prevchr_len);
2767 else if (has_mbyte)
2768 prevchr_len += (*mb_ptr2len)(regparse + prevchr_len);
2769 else
2770 #endif
2771 ++prevchr_len;
2772 }
2773 regparse += prevchr_len;
2774 prev_at_start = at_start;
2775 at_start = FALSE;
2776 prevprevchr = prevchr;
2777 prevchr = curchr;
2778 curchr = nextchr; /* use previously unget char, or -1 */
2779 nextchr = -1;
2780 }
2781
2782 /*
2783 * Skip a character while keeping the value of prev_at_start for at_start.
2784 * prevchr and prevprevchr are also kept.
2785 */
2786 static void
2787 skipchr_keepstart()
2788 {
2789 int as = prev_at_start;
2790 int pr = prevchr;
2791 int prpr = prevprevchr;
2792
2793 skipchr();
2794 at_start = as;
2795 prevchr = pr;
2796 prevprevchr = prpr;
2797 }
2798
2799 static int
2800 getchr()
2801 {
2802 int chr = peekchr();
2803
2804 skipchr();
2805 return chr;
2806 }
2807
2808 /*
2809 * put character back. Works only once!
2810 */
2811 static void
2812 ungetchr()
2813 {
2814 nextchr = curchr;
2815 curchr = prevchr;
2816 prevchr = prevprevchr;
2817 at_start = prev_at_start;
2818 prev_at_start = FALSE;
2819
2820 /* Backup regparse, so that it's at the same position as before the
2821 * getchr(). */
2822 regparse -= prevchr_len;
2823 }
2824
2825 /*
2826 * Get and return the value of the hex string at the current position.
2827 * Return -1 if there is no valid hex number.
2828 * The position is updated:
2829 * blahblah\%x20asdf
2830 * before-^ ^-after
2831 * The parameter controls the maximum number of input characters. This will be
2832 * 2 when reading a \%x20 sequence and 4 when reading a \%u20AC sequence.
2833 */
2834 static int
2835 gethexchrs(maxinputlen)
2836 int maxinputlen;
2837 {
2838 int nr = 0;
2839 int c;
2840 int i;
2841
2842 for (i = 0; i < maxinputlen; ++i)
2843 {
2844 c = regparse[0];
2845 if (!vim_isxdigit(c))
2846 break;
2847 nr <<= 4;
2848 nr |= hex2nr(c);
2849 ++regparse;
2850 }
2851
2852 if (i == 0)
2853 return -1;
2854 return nr;
2855 }
2856
2857 /*
2858 * get and return the value of the decimal string immediately after the
2859 * current position. Return -1 for invalid. Consumes all digits.
2860 */
2861 static int
2862 getdecchrs()
2863 {
2864 int nr = 0;
2865 int c;
2866 int i;
2867
2868 for (i = 0; ; ++i)
2869 {
2870 c = regparse[0];
2871 if (c < '0' || c > '9')
2872 break;
2873 nr *= 10;
2874 nr += c - '0';
2875 ++regparse;
2876 }
2877
2878 if (i == 0)
2879 return -1;
2880 return nr;
2881 }
2882
2883 /*
2884 * get and return the value of the octal string immediately after the current
2885 * position. Return -1 for invalid, or 0-255 for valid. Smart enough to handle
2886 * numbers > 377 correctly (for example, 400 is treated as 40) and doesn't
2887 * treat 8 or 9 as recognised characters. Position is updated:
2888 * blahblah\%o210asdf
2889 * before-^ ^-after
2890 */
2891 static int
2892 getoctchrs()
2893 {
2894 int nr = 0;
2895 int c;
2896 int i;
2897
2898 for (i = 0; i < 3 && nr < 040; ++i)
2899 {
2900 c = regparse[0];
2901 if (c < '0' || c > '7')
2902 break;
2903 nr <<= 3;
2904 nr |= hex2nr(c);
2905 ++regparse;
2906 }
2907
2908 if (i == 0)
2909 return -1;
2910 return nr;
2911 }
2912
2913 /*
2914 * Get a number after a backslash that is inside [].
2915 * When nothing is recognized return a backslash.
2916 */
2917 static int
2918 coll_get_char()
2919 {
2920 int nr = -1;
2921
2922 switch (*regparse++)
2923 {
2924 case 'd': nr = getdecchrs(); break;
2925 case 'o': nr = getoctchrs(); break;
2926 case 'x': nr = gethexchrs(2); break;
2927 case 'u': nr = gethexchrs(4); break;
2928 case 'U': nr = gethexchrs(8); break;
2929 }
2930 if (nr < 0)
2931 {
2932 /* If getting the number fails be backwards compatible: the character
2933 * is a backslash. */
2934 --regparse;
2935 nr = '\\';
2936 }
2937 return nr;
2938 }
2939
2940 /*
2941 * read_limits - Read two integers to be taken as a minimum and maximum.
2942 * If the first character is '-', then the range is reversed.
2943 * Should end with 'end'. If minval is missing, zero is default, if maxval is
2944 * missing, a very big number is the default.
2945 */
2946 static int
2947 read_limits(minval, maxval)
2948 long *minval;
2949 long *maxval;
2950 {
2951 int reverse = FALSE;
2952 char_u *first_char;
2953 long tmp;
2954
2955 if (*regparse == '-')
2956 {
2957 /* Starts with '-', so reverse the range later */
2958 regparse++;
2959 reverse = TRUE;
2960 }
2961 first_char = regparse;
2962 *minval = getdigits(&regparse);
2963 if (*regparse == ',') /* There is a comma */
2964 {
2965 if (vim_isdigit(*++regparse))
2966 *maxval = getdigits(&regparse);
2967 else
2968 *maxval = MAX_LIMIT;
2969 }
2970 else if (VIM_ISDIGIT(*first_char))
2971 *maxval = *minval; /* It was \{n} or \{-n} */
2972 else
2973 *maxval = MAX_LIMIT; /* It was \{} or \{-} */
2974 if (*regparse == '\\')
2975 regparse++; /* Allow either \{...} or \{...\} */
2976 if (*regparse != '}')
2977 {
2978 sprintf((char *)IObuff, _("E554: Syntax error in %s{...}"),
2979 reg_magic == MAGIC_ALL ? "" : "\\");
2980 EMSG_RET_FAIL(IObuff);
2981 }
2982
2983 /*
2984 * Reverse the range if there was a '-', or make sure it is in the right
2985 * order otherwise.
2986 */
2987 if ((!reverse && *minval > *maxval) || (reverse && *minval < *maxval))
2988 {
2989 tmp = *minval;
2990 *minval = *maxval;
2991 *maxval = tmp;
2992 }
2993 skipchr(); /* let's be friends with the lexer again */
2994 return OK;
2995 }
2996
2997 /*
2998 * vim_regexec and friends
2999 */
3000
3001 /*
3002 * Global work variables for vim_regexec().
3003 */
3004
3005 /* The current match-position is remembered with these variables: */
3006 static linenr_T reglnum; /* line number, relative to first line */
3007 static char_u *regline; /* start of current line */
3008 static char_u *reginput; /* current input, points into "regline" */
3009
3010 static int need_clear_subexpr; /* subexpressions still need to be
3011 * cleared */
3012 #ifdef FEAT_SYN_HL
3013 static int need_clear_zsubexpr = FALSE; /* extmatch subexpressions
3014 * still need to be cleared */
3015 #endif
3016
3017 /*
3018 * Structure used to save the current input state, when it needs to be
3019 * restored after trying a match. Used by reg_save() and reg_restore().
3020 * Also stores the length of "backpos".
3021 */
3022 typedef struct
3023 {
3024 union
3025 {
3026 char_u *ptr; /* reginput pointer, for single-line regexp */
3027 lpos_T pos; /* reginput pos, for multi-line regexp */
3028 } rs_u;
3029 int rs_len;
3030 } regsave_T;
3031
3032 /* struct to save start/end pointer/position in for \(\) */
3033 typedef struct
3034 {
3035 union
3036 {
3037 char_u *ptr;
3038 lpos_T pos;
3039 } se_u;
3040 } save_se_T;
3041
3042 /* used for BEHIND and NOBEHIND matching */
3043 typedef struct regbehind_S
3044 {
3045 regsave_T save_after;
3046 regsave_T save_behind;
3047 int save_need_clear_subexpr;
3048 save_se_T save_start[NSUBEXP];
3049 save_se_T save_end[NSUBEXP];
3050 } regbehind_T;
3051
3052 static char_u *reg_getline __ARGS((linenr_T lnum));
3053 static long vim_regexec_both __ARGS((char_u *line, colnr_T col, proftime_T *tm));
3054 static long regtry __ARGS((regprog_T *prog, colnr_T col));
3055 static void cleanup_subexpr __ARGS((void));
3056 #ifdef FEAT_SYN_HL
3057 static void cleanup_zsubexpr __ARGS((void));
3058 #endif
3059 static void save_subexpr __ARGS((regbehind_T *bp));
3060 static void restore_subexpr __ARGS((regbehind_T *bp));
3061 static void reg_nextline __ARGS((void));
3062 static void reg_save __ARGS((regsave_T *save, garray_T *gap));
3063 static void reg_restore __ARGS((regsave_T *save, garray_T *gap));
3064 static int reg_save_equal __ARGS((regsave_T *save));
3065 static void save_se_multi __ARGS((save_se_T *savep, lpos_T *posp));
3066 static void save_se_one __ARGS((save_se_T *savep, char_u **pp));
3067
3068 /* Save the sub-expressions before attempting a match. */
3069 #define save_se(savep, posp, pp) \
3070 REG_MULTI ? save_se_multi((savep), (posp)) : save_se_one((savep), (pp))
3071
3072 /* After a failed match restore the sub-expressions. */
3073 #define restore_se(savep, posp, pp) { \
3074 if (REG_MULTI) \
3075 *(posp) = (savep)->se_u.pos; \
3076 else \
3077 *(pp) = (savep)->se_u.ptr; }
3078
3079 static int re_num_cmp __ARGS((long_u val, char_u *scan));
3080 static int regmatch __ARGS((char_u *prog));
3081 static int regrepeat __ARGS((char_u *p, long maxcount));
3082
3083 #ifdef DEBUG
3084 int regnarrate = 0;
3085 #endif
3086
3087 /*
3088 * Internal copy of 'ignorecase'. It is set at each call to vim_regexec().
3089 * Normally it gets the value of "rm_ic" or "rmm_ic", but when the pattern
3090 * contains '\c' or '\C' the value is overruled.
3091 */
3092 static int ireg_ic;
3093
3094 #ifdef FEAT_MBYTE
3095 /*
3096 * Similar to ireg_ic, but only for 'combining' characters. Set with \Z flag
3097 * in the regexp. Defaults to false, always.
3098 */
3099 static int ireg_icombine;
3100 #endif
3101
3102 /*
3103 * Copy of "rmm_maxcol": maximum column to search for a match. Zero when
3104 * there is no maximum.
3105 */
3106 static colnr_T ireg_maxcol;
3107
3108 /*
3109 * Sometimes need to save a copy of a line. Since alloc()/free() is very
3110 * slow, we keep one allocated piece of memory and only re-allocate it when
3111 * it's too small. It's freed in vim_regexec_both() when finished.
3112 */
3113 static char_u *reg_tofree = NULL;
3114 static unsigned reg_tofreelen;
3115
3116 /*
3117 * These variables are set when executing a regexp to speed up the execution.
3118 * Which ones are set depends on whether a single-line or multi-line match is
3119 * done:
3120 * single-line multi-line
3121 * reg_match &regmatch_T NULL
3122 * reg_mmatch NULL &regmmatch_T
3123 * reg_startp reg_match->startp <invalid>
3124 * reg_endp reg_match->endp <invalid>
3125 * reg_startpos <invalid> reg_mmatch->startpos
3126 * reg_endpos <invalid> reg_mmatch->endpos
3127 * reg_win NULL window in which to search
3128 * reg_buf <invalid> buffer in which to search
3129 * reg_firstlnum <invalid> first line in which to search
3130 * reg_maxline 0 last line nr
3131 * reg_line_lbr FALSE or TRUE FALSE
3132 */
3133 static regmatch_T *reg_match;
3134 static regmmatch_T *reg_mmatch;
3135 static char_u **reg_startp = NULL;
3136 static char_u **reg_endp = NULL;
3137 static lpos_T *reg_startpos = NULL;
3138 static lpos_T *reg_endpos = NULL;
3139 static win_T *reg_win;
3140 static buf_T *reg_buf;
3141 static linenr_T reg_firstlnum;
3142 static linenr_T reg_maxline;
3143 static int reg_line_lbr; /* "\n" in string is line break */
3144
3145 /* Values for rs_state in regitem_T. */
3146 typedef enum regstate_E
3147 {
3148 RS_NOPEN = 0 /* NOPEN and NCLOSE */
3149 , RS_MOPEN /* MOPEN + [0-9] */
3150 , RS_MCLOSE /* MCLOSE + [0-9] */
3151 #ifdef FEAT_SYN_HL
3152 , RS_ZOPEN /* ZOPEN + [0-9] */
3153 , RS_ZCLOSE /* ZCLOSE + [0-9] */
3154 #endif
3155 , RS_BRANCH /* BRANCH */
3156 , RS_BRCPLX_MORE /* BRACE_COMPLEX and trying one more match */
3157 , RS_BRCPLX_LONG /* BRACE_COMPLEX and trying longest match */
3158 , RS_BRCPLX_SHORT /* BRACE_COMPLEX and trying shortest match */
3159 , RS_NOMATCH /* NOMATCH */
3160 , RS_BEHIND1 /* BEHIND / NOBEHIND matching rest */
3161 , RS_BEHIND2 /* BEHIND / NOBEHIND matching behind part */
3162 , RS_STAR_LONG /* STAR/PLUS/BRACE_SIMPLE longest match */
3163 , RS_STAR_SHORT /* STAR/PLUS/BRACE_SIMPLE shortest match */
3164 } regstate_T;
3165
3166 /*
3167 * When there are alternatives a regstate_T is put on the regstack to remember
3168 * what we are doing.
3169 * Before it may be another type of item, depending on rs_state, to remember
3170 * more things.
3171 */
3172 typedef struct regitem_S
3173 {
3174 regstate_T rs_state; /* what we are doing, one of RS_ above */
3175 char_u *rs_scan; /* current node in program */
3176 union
3177 {
3178 save_se_T sesave;
3179 regsave_T regsave;
3180 } rs_un; /* room for saving reginput */
3181 short rs_no; /* submatch nr or BEHIND/NOBEHIND */
3182 } regitem_T;
3183
3184 static regitem_T *regstack_push __ARGS((regstate_T state, char_u *scan));
3185 static void regstack_pop __ARGS((char_u **scan));
3186
3187 /* used for STAR, PLUS and BRACE_SIMPLE matching */
3188 typedef struct regstar_S
3189 {
3190 int nextb; /* next byte */
3191 int nextb_ic; /* next byte reverse case */
3192 long count;
3193 long minval;
3194 long maxval;
3195 } regstar_T;
3196
3197 /* used to store input position when a BACK was encountered, so that we now if
3198 * we made any progress since the last time. */
3199 typedef struct backpos_S
3200 {
3201 char_u *bp_scan; /* "scan" where BACK was encountered */
3202 regsave_T bp_pos; /* last input position */
3203 } backpos_T;
3204
3205 /*
3206 * "regstack" and "backpos" are used by regmatch(). They are kept over calls
3207 * to avoid invoking malloc() and free() often.
3208 * "regstack" is a stack with regitem_T items, sometimes preceded by regstar_T
3209 * or regbehind_T.
3210 * "backpos_T" is a table with backpos_T for BACK
3211 */
3212 static garray_T regstack = {0, 0, 0, 0, NULL};
3213 static garray_T backpos = {0, 0, 0, 0, NULL};
3214
3215 /*
3216 * Both for regstack and backpos tables we use the following strategy of
3217 * allocation (to reduce malloc/free calls):
3218 * - Initial size is fairly small.
3219 * - When needed, the tables are grown bigger (8 times at first, double after
3220 * that).
3221 * - After executing the match we free the memory only if the array has grown.
3222 * Thus the memory is kept allocated when it's at the initial size.
3223 * This makes it fast while not keeping a lot of memory allocated.
3224 * A three times speed increase was observed when using many simple patterns.
3225 */
3226 #define REGSTACK_INITIAL 2048
3227 #define BACKPOS_INITIAL 64
3228
3229 #if defined(EXITFREE) || defined(PROTO)
3230 void
3231 free_regexp_stuff()
3232 {
3233 ga_clear(&regstack);
3234 ga_clear(&backpos);
3235 vim_free(reg_tofree);
3236 vim_free(reg_prev_sub);
3237 }
3238 #endif
3239
3240 /*
3241 * Get pointer to the line "lnum", which is relative to "reg_firstlnum".
3242 */
3243 static char_u *
3244 reg_getline(lnum)
3245 linenr_T lnum;
3246 {
3247 /* when looking behind for a match/no-match lnum is negative. But we
3248 * can't go before line 1 */
3249 if (reg_firstlnum + lnum < 1)
3250 return NULL;
3251 if (lnum > reg_maxline)
3252 /* Must have matched the "\n" in the last line. */
3253 return (char_u *)"";
3254 return ml_get_buf(reg_buf, reg_firstlnum + lnum, FALSE);
3255 }
3256
3257 static regsave_T behind_pos;
3258
3259 #ifdef FEAT_SYN_HL
3260 static char_u *reg_startzp[NSUBEXP]; /* Workspace to mark beginning */
3261 static char_u *reg_endzp[NSUBEXP]; /* and end of \z(...\) matches */
3262 static lpos_T reg_startzpos[NSUBEXP]; /* idem, beginning pos */
3263 static lpos_T reg_endzpos[NSUBEXP]; /* idem, end pos */
3264 #endif
3265
3266 /* TRUE if using multi-line regexp. */
3267 #define REG_MULTI (reg_match == NULL)
3268
3269 /*
3270 * Match a regexp against a string.
3271 * "rmp->regprog" is a compiled regexp as returned by vim_regcomp().
3272 * Uses curbuf for line count and 'iskeyword'.
3273 *
3274 * Return TRUE if there is a match, FALSE if not.
3275 */
3276 int
3277 vim_regexec(rmp, line, col)
3278 regmatch_T *rmp;
3279 char_u *line; /* string to match against */
3280 colnr_T col; /* column to start looking for match */
3281 {
3282 reg_match = rmp;
3283 reg_mmatch = NULL;
3284 reg_maxline = 0;
3285 reg_line_lbr = FALSE;
3286 reg_win = NULL;
3287 ireg_ic = rmp->rm_ic;
3288 #ifdef FEAT_MBYTE
3289 ireg_icombine = FALSE;
3290 #endif
3291 ireg_maxcol = 0;
3292 return (vim_regexec_both(line, col, NULL) != 0);
3293 }
3294
3295 #if defined(FEAT_MODIFY_FNAME) || defined(FEAT_EVAL) \
3296 || defined(FIND_REPLACE_DIALOG) || defined(PROTO)
3297 /*
3298 * Like vim_regexec(), but consider a "\n" in "line" to be a line break.
3299 */
3300 int
3301 vim_regexec_nl(rmp, line, col)
3302 regmatch_T *rmp;
3303 char_u *line; /* string to match against */
3304 colnr_T col; /* column to start looking for match */
3305 {
3306 reg_match = rmp;
3307 reg_mmatch = NULL;
3308 reg_maxline = 0;
3309 reg_line_lbr = TRUE;
3310 reg_win = NULL;
3311 ireg_ic = rmp->rm_ic;
3312 #ifdef FEAT_MBYTE
3313 ireg_icombine = FALSE;
3314 #endif
3315 ireg_maxcol = 0;
3316 return (vim_regexec_both(line, col, NULL) != 0);
3317 }
3318 #endif
3319
3320 /*
3321 * Match a regexp against multiple lines.
3322 * "rmp->regprog" is a compiled regexp as returned by vim_regcomp().
3323 * Uses curbuf for line count and 'iskeyword'.
3324 *
3325 * Return zero if there is no match. Return number of lines contained in the
3326 * match otherwise.
3327 */
3328 long
3329 vim_regexec_multi(rmp, win, buf, lnum, col, tm)
3330 regmmatch_T *rmp;
3331 win_T *win; /* window in which to search or NULL */
3332 buf_T *buf; /* buffer in which to search */
3333 linenr_T lnum; /* nr of line to start looking for match */
3334 colnr_T col; /* column to start looking for match */
3335 proftime_T *tm; /* timeout limit or NULL */
3336 {
3337 long r;
3338 buf_T *save_curbuf = curbuf;
3339
3340 reg_match = NULL;
3341 reg_mmatch = rmp;
3342 reg_buf = buf;
3343 reg_win = win;
3344 reg_firstlnum = lnum;
3345 reg_maxline = reg_buf->b_ml.ml_line_count - lnum;
3346 reg_line_lbr = FALSE;
3347 ireg_ic = rmp->rmm_ic;
3348 #ifdef FEAT_MBYTE
3349 ireg_icombine = FALSE;
3350 #endif
3351 ireg_maxcol = rmp->rmm_maxcol;
3352
3353 /* Need to switch to buffer "buf" to make vim_iswordc() work. */
3354 curbuf = buf;
3355 r = vim_regexec_both(NULL, col, tm);
3356 curbuf = save_curbuf;
3357
3358 return r;
3359 }
3360
3361 /*
3362 * Match a regexp against a string ("line" points to the string) or multiple
3363 * lines ("line" is NULL, use reg_getline()).
3364 */
3365 static long
3366 vim_regexec_both(line, col, tm)
3367 char_u *line;
3368 colnr_T col; /* column to start looking for match */
3369 proftime_T *tm UNUSED; /* timeout limit or NULL */
3370 {
3371 regprog_T *prog;
3372 char_u *s;
3373 long retval = 0L;
3374
3375 /* Create "regstack" and "backpos" if they are not allocated yet.
3376 * We allocate *_INITIAL amount of bytes first and then set the grow size
3377 * to much bigger value to avoid many malloc calls in case of deep regular
3378 * expressions. */
3379 if (regstack.ga_data == NULL)
3380 {
3381 /* Use an item size of 1 byte, since we push different things
3382 * onto the regstack. */
3383 ga_init2(&regstack, 1, REGSTACK_INITIAL);
3384 ga_grow(&regstack, REGSTACK_INITIAL);
3385 regstack.ga_growsize = REGSTACK_INITIAL * 8;
3386 }
3387
3388 if (backpos.ga_data == NULL)
3389 {
3390 ga_init2(&backpos, sizeof(backpos_T), BACKPOS_INITIAL);
3391 ga_grow(&backpos, BACKPOS_INITIAL);
3392 backpos.ga_growsize = BACKPOS_INITIAL * 8;
3393 }
3394
3395 if (REG_MULTI)
3396 {
3397 prog = reg_mmatch->regprog;
3398 line = reg_getline((linenr_T)0);
3399 reg_startpos = reg_mmatch->startpos;
3400 reg_endpos = reg_mmatch->endpos;
3401 }
3402 else
3403 {
3404 prog = reg_match->regprog;
3405 reg_startp = reg_match->startp;
3406 reg_endp = reg_match->endp;
3407 }
3408
3409 /* Be paranoid... */
3410 if (prog == NULL || line == NULL)
3411 {
3412 EMSG(_(e_null));
3413 goto theend;
3414 }
3415
3416 /* Check validity of program. */
3417 if (prog_magic_wrong())
3418 goto theend;
3419
3420 /* If the start column is past the maximum column: no need to try. */
3421 if (ireg_maxcol > 0 && col >= ireg_maxcol)
3422 goto theend;
3423
3424 /* If pattern contains "\c" or "\C": overrule value of ireg_ic */
3425 if (prog->regflags & RF_ICASE)
3426 ireg_ic = TRUE;
3427 else if (prog->regflags & RF_NOICASE)
3428 ireg_ic = FALSE;
3429
3430 #ifdef FEAT_MBYTE
3431 /* If pattern contains "\Z" overrule value of ireg_icombine */
3432 if (prog->regflags & RF_ICOMBINE)
3433 ireg_icombine = TRUE;
3434 #endif
3435
3436 /* If there is a "must appear" string, look for it. */
3437 if (prog->regmust != NULL)
3438 {
3439 int c;
3440
3441 #ifdef FEAT_MBYTE
3442 if (has_mbyte)
3443 c = (*mb_ptr2char)(prog->regmust);
3444 else
3445 #endif
3446 c = *prog->regmust;
3447 s = line + col;
3448
3449 /*
3450 * This is used very often, esp. for ":global". Use three versions of
3451 * the loop to avoid overhead of conditions.
3452 */
3453 if (!ireg_ic
3454 #ifdef FEAT_MBYTE
3455 && !has_mbyte
3456 #endif
3457 )
3458 while ((s = vim_strbyte(s, c)) != NULL)
3459 {
3460 if (cstrncmp(s, prog->regmust, &prog->regmlen) == 0)
3461 break; /* Found it. */
3462 ++s;
3463 }
3464 #ifdef FEAT_MBYTE
3465 else if (!ireg_ic || (!enc_utf8 && mb_char2len(c) > 1))
3466 while ((s = vim_strchr(s, c)) != NULL)
3467 {
3468 if (cstrncmp(s, prog->regmust, &prog->regmlen) == 0)
3469 break; /* Found it. */
3470 mb_ptr_adv(s);
3471 }
3472 #endif
3473 else
3474 while ((s = cstrchr(s, c)) != NULL)
3475 {
3476 if (cstrncmp(s, prog->regmust, &prog->regmlen) == 0)
3477 break; /* Found it. */
3478 mb_ptr_adv(s);
3479 }
3480 if (s == NULL) /* Not present. */
3481 goto theend;
3482 }
3483
3484 regline = line;
3485 reglnum = 0;
3486
3487 /* Simplest case: Anchored match need be tried only once. */
3488 if (prog->reganch)
3489 {
3490 int c;
3491
3492 #ifdef FEAT_MBYTE
3493 if (has_mbyte)
3494 c = (*mb_ptr2char)(regline + col);
3495 else
3496 #endif
3497 c = regline[col];
3498 if (prog->regstart == NUL
3499 || prog->regstart == c
3500 || (ireg_ic && ((
3501 #ifdef FEAT_MBYTE
3502 (enc_utf8 && utf_fold(prog->regstart) == utf_fold(c)))
3503 || (c < 255 && prog->regstart < 255 &&
3504 #endif
3505 MB_TOLOWER(prog->regstart) == MB_TOLOWER(c)))))
3506 retval = regtry(prog, col);
3507 else
3508 retval = 0;
3509 }
3510 else
3511 {
3512 #ifdef FEAT_RELTIME
3513 int tm_count = 0;
3514 #endif
3515 /* Messy cases: unanchored match. */
3516 while (!got_int)
3517 {
3518 if (prog->regstart != NUL)
3519 {
3520 /* Skip until the char we know it must start with.
3521 * Used often, do some work to avoid call overhead. */
3522 if (!ireg_ic
3523 #ifdef FEAT_MBYTE
3524 && !has_mbyte
3525 #endif
3526 )
3527 s = vim_strbyte(regline + col, prog->regstart);
3528 else
3529 s = cstrchr(regline + col, prog->regstart);
3530 if (s == NULL)
3531 {
3532 retval = 0;
3533 break;
3534 }
3535 col = (int)(s - regline);
3536 }
3537
3538 /* Check for maximum column to try. */
3539 if (ireg_maxcol > 0 && col >= ireg_maxcol)
3540 {
3541 retval = 0;
3542 break;
3543 }
3544
3545 retval = regtry(prog, col);
3546 if (retval > 0)
3547 break;
3548
3549 /* if not currently on the first line, get it again */
3550 if (reglnum != 0)
3551 {
3552 reglnum = 0;
3553 regline = reg_getline((linenr_T)0);
3554 }
3555 if (regline[col] == NUL)
3556 break;
3557 #ifdef FEAT_MBYTE
3558 if (has_mbyte)
3559 col += (*mb_ptr2len)(regline + col);
3560 else
3561 #endif
3562 ++col;
3563 #ifdef FEAT_RELTIME
3564 /* Check for timeout once in a twenty times to avoid overhead. */
3565 if (tm != NULL && ++tm_count == 20)
3566 {
3567 tm_count = 0;
3568 if (profile_passed_limit(tm))
3569 break;
3570 }
3571 #endif
3572 }
3573 }
3574
3575 theend:
3576 /* Free "reg_tofree" when it's a bit big.
3577 * Free regstack and backpos if they are bigger than their initial size. */
3578 if (reg_tofreelen > 400)
3579 {
3580 vim_free(reg_tofree);
3581 reg_tofree = NULL;
3582 }
3583 if (regstack.ga_maxlen > REGSTACK_INITIAL)
3584 ga_clear(&regstack);
3585 if (backpos.ga_maxlen > BACKPOS_INITIAL)
3586 ga_clear(&backpos);
3587
3588 return retval;
3589 }
3590
3591 #ifdef FEAT_SYN_HL
3592 static reg_extmatch_T *make_extmatch __ARGS((void));
3593
3594 /*
3595 * Create a new extmatch and mark it as referenced once.
3596 */
3597 static reg_extmatch_T *
3598 make_extmatch()
3599 {
3600 reg_extmatch_T *em;
3601
3602 em = (reg_extmatch_T *)alloc_clear((unsigned)sizeof(reg_extmatch_T));
3603 if (em != NULL)
3604 em->refcnt = 1;
3605 return em;
3606 }
3607
3608 /*
3609 * Add a reference to an extmatch.
3610 */
3611 reg_extmatch_T *
3612 ref_extmatch(em)
3613 reg_extmatch_T *em;
3614 {
3615 if (em != NULL)
3616 em->refcnt++;
3617 return em;
3618 }
3619
3620 /*
3621 * Remove a reference to an extmatch. If there are no references left, free
3622 * the info.
3623 */
3624 void
3625 unref_extmatch(em)
3626 reg_extmatch_T *em;
3627 {
3628 int i;
3629
3630 if (em != NULL && --em->refcnt <= 0)
3631 {
3632 for (i = 0; i < NSUBEXP; ++i)
3633 vim_free(em->matches[i]);
3634 vim_free(em);
3635 }
3636 }
3637 #endif
3638
3639 /*
3640 * regtry - try match of "prog" with at regline["col"].
3641 * Returns 0 for failure, number of lines contained in the match otherwise.
3642 */
3643 static long
3644 regtry(prog, col)
3645 regprog_T *prog;
3646 colnr_T col;
3647 {
3648 reginput = regline + col;
3649 need_clear_subexpr = TRUE;
3650 #ifdef FEAT_SYN_HL
3651 /* Clear the external match subpointers if necessary. */
3652 if (prog->reghasz == REX_SET)
3653 need_clear_zsubexpr = TRUE;
3654 #endif
3655
3656 if (regmatch(prog->program + 1) == 0)
3657 return 0;
3658
3659 cleanup_subexpr();
3660 if (REG_MULTI)
3661 {
3662 if (reg_startpos[0].lnum < 0)
3663 {
3664 reg_startpos[0].lnum = 0;
3665 reg_startpos[0].col = col;
3666 }
3667 if (reg_endpos[0].lnum < 0)
3668 {
3669 reg_endpos[0].lnum = reglnum;
3670 reg_endpos[0].col = (int)(reginput - regline);
3671 }
3672 else
3673 /* Use line number of "\ze". */
3674 reglnum = reg_endpos[0].lnum;
3675 }
3676 else
3677 {
3678 if (reg_startp[0] == NULL)
3679 reg_startp[0] = regline + col;
3680 if (reg_endp[0] == NULL)
3681 reg_endp[0] = reginput;
3682 }
3683 #ifdef FEAT_SYN_HL
3684 /* Package any found \z(...\) matches for export. Default is none. */
3685 unref_extmatch(re_extmatch_out);
3686 re_extmatch_out = NULL;
3687
3688 if (prog->reghasz == REX_SET)
3689 {
3690 int i;
3691
3692 cleanup_zsubexpr();
3693 re_extmatch_out = make_extmatch();
3694 for (i = 0; i < NSUBEXP; i++)
3695 {
3696 if (REG_MULTI)
3697 {
3698 /* Only accept single line matches. */
3699 if (reg_startzpos[i].lnum >= 0
3700 && reg_endzpos[i].lnum == reg_startzpos[i].lnum)
3701 re_extmatch_out->matches[i] =
3702 vim_strnsave(reg_getline(reg_startzpos[i].lnum)
3703 + reg_startzpos[i].col,
3704 reg_endzpos[i].col - reg_startzpos[i].col);
3705 }
3706 else
3707 {
3708 if (reg_startzp[i] != NULL && reg_endzp[i] != NULL)
3709 re_extmatch_out->matches[i] =
3710 vim_strnsave(reg_startzp[i],
3711 (int)(reg_endzp[i] - reg_startzp[i]));
3712 }
3713 }
3714 }
3715 #endif
3716 return 1 + reglnum;
3717 }
3718
3719 #ifdef FEAT_MBYTE
3720 static int reg_prev_class __ARGS((void));
3721
3722 /*
3723 * Get class of previous character.
3724 */
3725 static int
3726 reg_prev_class()
3727 {
3728 if (reginput > regline)
3729 return mb_get_class(reginput - 1
3730 - (*mb_head_off)(regline, reginput - 1));
3731 return -1;
3732 }
3733
3734 #endif
3735 #define ADVANCE_REGINPUT() mb_ptr_adv(reginput)
3736
3737 /*
3738 * The arguments from BRACE_LIMITS are stored here. They are actually local
3739 * to regmatch(), but they are here to reduce the amount of stack space used
3740 * (it can be called recursively many times).
3741 */
3742 static long bl_minval;
3743 static long bl_maxval;
3744
3745 /*
3746 * regmatch - main matching routine
3747 *
3748 * Conceptually the strategy is simple: Check to see whether the current node
3749 * matches, push an item onto the regstack and loop to see whether the rest
3750 * matches, and then act accordingly. In practice we make some effort to
3751 * avoid using the regstack, in particular by going through "ordinary" nodes
3752 * (that don't need to know whether the rest of the match failed) by a nested
3753 * loop.
3754 *
3755 * Returns TRUE when there is a match. Leaves reginput and reglnum just after
3756 * the last matched character.
3757 * Returns FALSE when there is no match. Leaves reginput and reglnum in an
3758 * undefined state!
3759 */
3760 static int
3761 regmatch(scan)
3762 char_u *scan; /* Current node. */
3763 {
3764 char_u *next; /* Next node. */
3765 int op;
3766 int c;
3767 regitem_T *rp;
3768 int no;
3769 int status; /* one of the RA_ values: */
3770 #define RA_FAIL 1 /* something failed, abort */
3771 #define RA_CONT 2 /* continue in inner loop */
3772 #define RA_BREAK 3 /* break inner loop */
3773 #define RA_MATCH 4 /* successful match */
3774 #define RA_NOMATCH 5 /* didn't match */
3775
3776 /* Make "regstack" and "backpos" empty. They are allocated and freed in
3777 * vim_regexec_both() to reduce malloc()/free() calls. */
3778 regstack.ga_len = 0;
3779 backpos.ga_len = 0;
3780
3781 /*
3782 * Repeat until "regstack" is empty.
3783 */
3784 for (;;)
3785 {
3786 /* Some patterns my cause a long time to match, even though they are not
3787 * illegal. E.g., "\([a-z]\+\)\+Q". Allow breaking them with CTRL-C. */
3788 fast_breakcheck();
3789
3790 #ifdef DEBUG
3791 if (scan != NULL && regnarrate)
3792 {
3793 mch_errmsg(regprop(scan));
3794 mch_errmsg("(\n");
3795 }
3796 #endif
3797
3798 /*
3799 * Repeat for items that can be matched sequentially, without using the
3800 * regstack.
3801 */
3802 for (;;)
3803 {
3804 if (got_int || scan == NULL)
3805 {
3806 status = RA_FAIL;
3807 break;
3808 }
3809 status = RA_CONT;
3810
3811 #ifdef DEBUG
3812 if (regnarrate)
3813 {
3814 mch_errmsg(regprop(scan));
3815 mch_errmsg("...\n");
3816 # ifdef FEAT_SYN_HL
3817 if (re_extmatch_in != NULL)
3818 {
3819 int i;
3820
3821 mch_errmsg(_("External submatches:\n"));
3822 for (i = 0; i < NSUBEXP; i++)
3823 {
3824 mch_errmsg(" \"");
3825 if (re_extmatch_in->matches[i] != NULL)
3826 mch_errmsg(re_extmatch_in->matches[i]);
3827 mch_errmsg("\"\n");
3828 }
3829 }
3830 # endif
3831 }
3832 #endif
3833 next = regnext(scan);
3834
3835 op = OP(scan);
3836 /* Check for character class with NL added. */
3837 if (!reg_line_lbr && WITH_NL(op) && REG_MULTI
3838 && *reginput == NUL && reglnum <= reg_maxline)
3839 {
3840 reg_nextline();
3841 }
3842 else if (reg_line_lbr && WITH_NL(op) && *reginput == '\n')
3843 {
3844 ADVANCE_REGINPUT();
3845 }
3846 else
3847 {
3848 if (WITH_NL(op))
3849 op -= ADD_NL;
3850 #ifdef FEAT_MBYTE
3851 if (has_mbyte)
3852 c = (*mb_ptr2char)(reginput);
3853 else
3854 #endif
3855 c = *reginput;
3856 switch (op)
3857 {
3858 case BOL:
3859 if (reginput != regline)
3860 status = RA_NOMATCH;
3861 break;
3862
3863 case EOL:
3864 if (c != NUL)
3865 status = RA_NOMATCH;
3866 break;
3867
3868 case RE_BOF:
3869 /* We're not at the beginning of the file when below the first
3870 * line where we started, not at the start of the line or we
3871 * didn't start at the first line of the buffer. */
3872 if (reglnum != 0 || reginput != regline
3873 || (REG_MULTI && reg_firstlnum > 1))
3874 status = RA_NOMATCH;
3875 break;
3876
3877 case RE_EOF:
3878 if (reglnum != reg_maxline || c != NUL)
3879 status = RA_NOMATCH;
3880 break;
3881
3882 case CURSOR:
3883 /* Check if the buffer is in a window and compare the
3884 * reg_win->w_cursor position to the match position. */
3885 if (reg_win == NULL
3886 || (reglnum + reg_firstlnum != reg_win->w_cursor.lnum)
3887 || ((colnr_T)(reginput - regline) != reg_win->w_cursor.col))
3888 status = RA_NOMATCH;
3889 break;
3890
3891 case RE_MARK:
3892 /* Compare the mark position to the match position. NOTE: Always
3893 * uses the current buffer. */
3894 {
3895 int mark = OPERAND(scan)[0];
3896 int cmp = OPERAND(scan)[1];
3897 pos_T *pos;
3898
3899 pos = getmark(mark, FALSE);
3900 if (pos == NULL /* mark doesn't exist */
3901 || pos->lnum <= 0 /* mark isn't set (in curbuf) */
3902 || (pos->lnum == reglnum + reg_firstlnum
3903 ? (pos->col == (colnr_T)(reginput - regline)
3904 ? (cmp == '<' || cmp == '>')
3905 : (pos->col < (colnr_T)(reginput - regline)
3906 ? cmp != '>'
3907 : cmp != '<'))
3908 : (pos->lnum < reglnum + reg_firstlnum
3909 ? cmp != '>'
3910 : cmp != '<')))
3911 status = RA_NOMATCH;
3912 }
3913 break;
3914
3915 case RE_VISUAL:
3916 #ifdef FEAT_VISUAL
3917 /* Check if the buffer is the current buffer. and whether the
3918 * position is inside the Visual area. */
3919 if (reg_buf != curbuf || VIsual.lnum == 0)
3920 status = RA_NOMATCH;
3921 else
3922 {
3923 pos_T top, bot;
3924 linenr_T lnum;
3925 colnr_T col;
3926 win_T *wp = reg_win == NULL ? curwin : reg_win;
3927 int mode;
3928
3929 if (VIsual_active)
3930 {
3931 if (lt(VIsual, wp->w_cursor))
3932 {
3933 top = VIsual;
3934 bot = wp->w_cursor;
3935 }
3936 else
3937 {
3938 top = wp->w_cursor;
3939 bot = VIsual;
3940 }
3941 mode = VIsual_mode;
3942 }
3943 else
3944 {
3945 if (lt(curbuf->b_visual.vi_start, curbuf->b_visual.vi_end))
3946 {
3947 top = curbuf->b_visual.vi_start;
3948 bot = curbuf->b_visual.vi_end;
3949 }
3950 else
3951 {
3952 top = curbuf->b_visual.vi_end;
3953 bot = curbuf->b_visual.vi_start;
3954 }
3955 mode = curbuf->b_visual.vi_mode;
3956 }
3957 lnum = reglnum + reg_firstlnum;
3958 col = (colnr_T)(reginput - regline);
3959 if (lnum < top.lnum || lnum > bot.lnum)
3960 status = RA_NOMATCH;
3961 else if (mode == 'v')
3962 {
3963 if ((lnum == top.lnum && col < top.col)
3964 || (lnum == bot.lnum
3965 && col >= bot.col + (*p_sel != 'e')))
3966 status = RA_NOMATCH;
3967 }
3968 else if (mode == Ctrl_V)
3969 {
3970 colnr_T start, end;
3971 colnr_T start2, end2;
3972 colnr_T cols;
3973
3974 getvvcol(wp, &top, &start, NULL, &end);
3975 getvvcol(wp, &bot, &start2, NULL, &end2);
3976 if (start2 < start)
3977 start = start2;
3978 if (end2 > end)
3979 end = end2;
3980 if (top.col == MAXCOL || bot.col == MAXCOL)
3981 end = MAXCOL;
3982 cols = win_linetabsize(wp,
3983 regline, (colnr_T)(reginput - regline));
3984 if (cols < start || cols > end - (*p_sel == 'e'))
3985 status = RA_NOMATCH;
3986 }
3987 }
3988 #else
3989 status = RA_NOMATCH;
3990 #endif
3991 break;
3992
3993 case RE_LNUM:
3994 if (!REG_MULTI || !re_num_cmp((long_u)(reglnum + reg_firstlnum),
3995 scan))
3996 status = RA_NOMATCH;
3997 break;
3998
3999 case RE_COL:
4000 if (!re_num_cmp((long_u)(reginput - regline) + 1, scan))
4001 status = RA_NOMATCH;
4002 break;
4003
4004 case RE_VCOL:
4005 if (!re_num_cmp((long_u)win_linetabsize(
4006 reg_win == NULL ? curwin : reg_win,
4007 regline, (colnr_T)(reginput - regline)) + 1, scan))
4008 status = RA_NOMATCH;
4009 break;
4010
4011 case BOW: /* \<word; reginput points to w */
4012 if (c == NUL) /* Can't match at end of line */
4013 status = RA_NOMATCH;
4014 #ifdef FEAT_MBYTE
4015 else if (has_mbyte)
4016 {
4017 int this_class;
4018
4019 /* Get class of current and previous char (if it exists). */
4020 this_class = mb_get_class(reginput);
4021 if (this_class <= 1)
4022 status = RA_NOMATCH; /* not on a word at all */
4023 else if (reg_prev_class() == this_class)
4024 status = RA_NOMATCH; /* previous char is in same word */
4025 }
4026 #endif
4027 else
4028 {
4029 if (!vim_iswordc(c)
4030 || (reginput > regline && vim_iswordc(reginput[-1])))
4031 status = RA_NOMATCH;
4032 }
4033 break;
4034
4035 case EOW: /* word\>; reginput points after d */
4036 if (reginput == regline) /* Can't match at start of line */
4037 status = RA_NOMATCH;
4038 #ifdef FEAT_MBYTE
4039 else if (has_mbyte)
4040 {
4041 int this_class, prev_class;
4042
4043 /* Get class of current and previous char (if it exists). */
4044 this_class = mb_get_class(reginput);
4045 prev_class = reg_prev_class();
4046 if (this_class == prev_class
4047 || prev_class == 0 || prev_class == 1)
4048 status = RA_NOMATCH;
4049 }
4050 #endif
4051 else
4052 {
4053 if (!vim_iswordc(reginput[-1])
4054 || (reginput[0] != NUL && vim_iswordc(c)))
4055 status = RA_NOMATCH;
4056 }
4057 break; /* Matched with EOW */
4058
4059 case ANY:
4060 if (c == NUL)
4061 status = RA_NOMATCH;
4062 else
4063 ADVANCE_REGINPUT();
4064 break;
4065
4066 case IDENT:
4067 if (!vim_isIDc(c))
4068 status = RA_NOMATCH;
4069 else
4070 ADVANCE_REGINPUT();
4071 break;
4072
4073 case SIDENT:
4074 if (VIM_ISDIGIT(*reginput) || !vim_isIDc(c))
4075 status = RA_NOMATCH;
4076 else
4077 ADVANCE_REGINPUT();
4078 break;
4079
4080 case KWORD:
4081 if (!vim_iswordp(reginput))
4082 status = RA_NOMATCH;
4083 else
4084 ADVANCE_REGINPUT();
4085 break;
4086
4087 case SKWORD:
4088 if (VIM_ISDIGIT(*reginput) || !vim_iswordp(reginput))
4089 status = RA_NOMATCH;
4090 else
4091 ADVANCE_REGINPUT();
4092 break;
4093
4094 case FNAME:
4095 if (!vim_isfilec(c))
4096 status = RA_NOMATCH;
4097 else
4098 ADVANCE_REGINPUT();
4099 break;
4100
4101 case SFNAME:
4102 if (VIM_ISDIGIT(*reginput) || !vim_isfilec(c))
4103 status = RA_NOMATCH;
4104 else
4105 ADVANCE_REGINPUT();
4106 break;
4107
4108 case PRINT:
4109 if (ptr2cells(reginput) != 1)
4110 status = RA_NOMATCH;
4111 else
4112 ADVANCE_REGINPUT();
4113 break;
4114
4115 case SPRINT:
4116 if (VIM_ISDIGIT(*reginput) || ptr2cells(reginput) != 1)
4117 status = RA_NOMATCH;
4118 else
4119 ADVANCE_REGINPUT();
4120 break;
4121
4122 case WHITE:
4123 if (!vim_iswhite(c))
4124 status = RA_NOMATCH;
4125 else
4126 ADVANCE_REGINPUT();
4127 break;
4128
4129 case NWHITE:
4130 if (c == NUL || vim_iswhite(c))
4131 status = RA_NOMATCH;
4132 else
4133 ADVANCE_REGINPUT();
4134 break;
4135
4136 case DIGIT:
4137 if (!ri_digit(c))
4138 status = RA_NOMATCH;
4139 else
4140 ADVANCE_REGINPUT();
4141 break;
4142
4143 case NDIGIT:
4144 if (c == NUL || ri_digit(c))
4145 status = RA_NOMATCH;
4146 else
4147 ADVANCE_REGINPUT();
4148 break;
4149
4150 case HEX:
4151 if (!ri_hex(c))
4152 status = RA_NOMATCH;
4153 else
4154 ADVANCE_REGINPUT();
4155 break;
4156
4157 case NHEX:
4158 if (c == NUL || ri_hex(c))
4159 status = RA_NOMATCH;
4160 else
4161 ADVANCE_REGINPUT();
4162 break;
4163
4164 case OCTAL:
4165 if (!ri_octal(c))
4166 status = RA_NOMATCH;
4167 else
4168 ADVANCE_REGINPUT();
4169 break;
4170
4171 case NOCTAL:
4172 if (c == NUL || ri_octal(c))
4173 status = RA_NOMATCH;
4174 else
4175 ADVANCE_REGINPUT();
4176 break;
4177
4178 case WORD:
4179 if (!ri_word(c))
4180 status = RA_NOMATCH;
4181 else
4182 ADVANCE_REGINPUT();
4183 break;
4184
4185 case NWORD:
4186 if (c == NUL || ri_word(c))
4187 status = RA_NOMATCH;
4188 else
4189 ADVANCE_REGINPUT();
4190 break;
4191
4192 case HEAD:
4193 if (!ri_head(c))
4194 status = RA_NOMATCH;
4195 else
4196 ADVANCE_REGINPUT();
4197 break;
4198
4199 case NHEAD:
4200 if (c == NUL || ri_head(c))
4201 status = RA_NOMATCH;
4202 else
4203 ADVANCE_REGINPUT();
4204 break;
4205
4206 case ALPHA:
4207 if (!ri_alpha(c))
4208 status = RA_NOMATCH;
4209 else
4210 ADVANCE_REGINPUT();
4211 break;
4212
4213 case NALPHA:
4214 if (c == NUL || ri_alpha(c))
4215 status = RA_NOMATCH;
4216 else
4217 ADVANCE_REGINPUT();
4218 break;
4219
4220 case LOWER:
4221 if (!ri_lower(c))
4222 status = RA_NOMATCH;
4223 else
4224 ADVANCE_REGINPUT();
4225 break;
4226
4227 case NLOWER:
4228 if (c == NUL || ri_lower(c))
4229 status = RA_NOMATCH;
4230 else
4231 ADVANCE_REGINPUT();
4232 break;
4233
4234 case UPPER:
4235 if (!ri_upper(c))
4236 status = RA_NOMATCH;
4237 else
4238 ADVANCE_REGINPUT();
4239 break;
4240
4241 case NUPPER:
4242 if (c == NUL || ri_upper(c))
4243 status = RA_NOMATCH;
4244 else
4245 ADVANCE_REGINPUT();
4246 break;
4247
4248 case EXACTLY:
4249 {
4250 int len;
4251 char_u *opnd;
4252
4253 opnd = OPERAND(scan);
4254 /* Inline the first byte, for speed. */
4255 if (*opnd != *reginput
4256 && (!ireg_ic || (
4257 #ifdef FEAT_MBYTE
4258 !enc_utf8 &&
4259 #endif
4260 MB_TOLOWER(*opnd) != MB_TOLOWER(*reginput))))
4261 status = RA_NOMATCH;
4262 else if (*opnd == NUL)
4263 {
4264 /* match empty string always works; happens when "~" is
4265 * empty. */
4266 }
4267 else if (opnd[1] == NUL
4268 #ifdef FEAT_MBYTE
4269 && !(enc_utf8 && ireg_ic)
4270 #endif
4271 )
4272 ++reginput; /* matched a single char */
4273 else
4274 {
4275 len = (int)STRLEN(opnd);
4276 /* Need to match first byte again for multi-byte. */
4277 if (cstrncmp(opnd, reginput, &len) != 0)
4278 status = RA_NOMATCH;
4279 #ifdef FEAT_MBYTE
4280 /* Check for following composing character. */
4281 else if (enc_utf8
4282 && UTF_COMPOSINGLIKE(reginput, reginput + len))
4283 {
4284 /* raaron: This code makes a composing character get
4285 * ignored, which is the correct behavior (sometimes)
4286 * for voweled Hebrew texts. */
4287 if (!ireg_icombine)
4288 status = RA_NOMATCH;
4289 }
4290 #endif
4291 else
4292 reginput += len;
4293 }
4294 }
4295 break;
4296
4297 case ANYOF:
4298 case ANYBUT:
4299 if (c == NUL)
4300 status = RA_NOMATCH;
4301 else if ((cstrchr(OPERAND(scan), c) == NULL) == (op == ANYOF))
4302 status = RA_NOMATCH;
4303 else
4304 ADVANCE_REGINPUT();
4305 break;
4306
4307 #ifdef FEAT_MBYTE
4308 case MULTIBYTECODE:
4309 if (has_mbyte)
4310 {
4311 int i, len;
4312 char_u *opnd;
4313 int opndc = 0, inpc;
4314
4315 opnd = OPERAND(scan);
4316 /* Safety check (just in case 'encoding' was changed since
4317 * compiling the program). */
4318 if ((len = (*mb_ptr2len)(opnd)) < 2)
4319 {
4320 status = RA_NOMATCH;
4321 break;
4322 }
4323 if (enc_utf8)
4324 opndc = mb_ptr2char(opnd);
4325 if (enc_utf8 && utf_iscomposing(opndc))
4326 {
4327 /* When only a composing char is given match at any
4328 * position where that composing char appears. */
4329 status = RA_NOMATCH;
4330 for (i = 0; reginput[i] != NUL; i += utf_char2len(inpc))
4331 {
4332 inpc = mb_ptr2char(reginput + i);
4333 if (!utf_iscomposing(inpc))
4334 {
4335 if (i > 0)
4336 break;
4337 }
4338 else if (opndc == inpc)
4339 {
4340 /* Include all following composing chars. */
4341 len = i + mb_ptr2len(reginput + i);
4342 status = RA_MATCH;
4343 break;
4344 }
4345 }
4346 }
4347 else
4348 for (i = 0; i < len; ++i)
4349 if (opnd[i] != reginput[i])
4350 {
4351 status = RA_NOMATCH;
4352 break;
4353 }
4354 reginput += len;
4355 }
4356 else
4357 status = RA_NOMATCH;
4358 break;
4359 #endif
4360
4361 case NOTHING:
4362 break;
4363
4364 case BACK:
4365 {
4366 int i;
4367 backpos_T *bp;
4368
4369 /*
4370 * When we run into BACK we need to check if we don't keep
4371 * looping without matching any input. The second and later
4372 * times a BACK is encountered it fails if the input is still
4373 * at the same position as the previous time.
4374 * The positions are stored in "backpos" and found by the
4375 * current value of "scan", the position in the RE program.
4376 */
4377 bp = (backpos_T *)backpos.ga_data;
4378 for (i = 0; i < backpos.ga_len; ++i)
4379 if (bp[i].bp_scan == scan)
4380 break;
4381 if (i == backpos.ga_len)
4382 {
4383 /* First time at this BACK, make room to store the pos. */
4384 if (ga_grow(&backpos, 1) == FAIL)
4385 status = RA_FAIL;
4386 else
4387 {
4388 /* get "ga_data" again, it may have changed */
4389 bp = (backpos_T *)backpos.ga_data;
4390 bp[i].bp_scan = scan;
4391 ++backpos.ga_len;
4392 }
4393 }
4394 else if (reg_save_equal(&bp[i].bp_pos))
4395 /* Still at same position as last time, fail. */
4396 status = RA_NOMATCH;
4397
4398 if (status != RA_FAIL && status != RA_NOMATCH)
4399 reg_save(&bp[i].bp_pos, &backpos);
4400 }
4401 break;
4402
4403 case MOPEN + 0: /* Match start: \zs */
4404 case MOPEN + 1: /* \( */
4405 case MOPEN + 2:
4406 case MOPEN + 3:
4407 case MOPEN + 4:
4408 case MOPEN + 5:
4409 case MOPEN + 6:
4410 case MOPEN + 7:
4411 case MOPEN + 8:
4412 case MOPEN + 9:
4413 {
4414 no = op - MOPEN;
4415 cleanup_subexpr();
4416 rp = regstack_push(RS_MOPEN, scan);
4417 if (rp == NULL)
4418 status = RA_FAIL;
4419 else
4420 {
4421 rp->rs_no = no;
4422 save_se(&rp->rs_un.sesave, &reg_startpos[no],
4423 &reg_startp[no]);
4424 /* We simply continue and handle the result when done. */
4425 }
4426 }
4427 break;
4428
4429 case NOPEN: /* \%( */
4430 case NCLOSE: /* \) after \%( */
4431 if (regstack_push(RS_NOPEN, scan) == NULL)
4432 status = RA_FAIL;
4433 /* We simply continue and handle the result when done. */
4434 break;
4435
4436 #ifdef FEAT_SYN_HL
4437 case ZOPEN + 1:
4438 case ZOPEN + 2:
4439 case ZOPEN + 3:
4440 case ZOPEN + 4:
4441 case ZOPEN + 5:
4442 case ZOPEN + 6:
4443 case ZOPEN + 7:
4444 case ZOPEN + 8:
4445 case ZOPEN + 9:
4446 {
4447 no = op - ZOPEN;
4448 cleanup_zsubexpr();
4449 rp = regstack_push(RS_ZOPEN, scan);
4450 if (rp == NULL)
4451 status = RA_FAIL;
4452 else
4453 {
4454 rp->rs_no = no;
4455 save_se(&rp->rs_un.sesave, &reg_startzpos[no],
4456 &reg_startzp[no]);
4457 /* We simply continue and handle the result when done. */
4458 }
4459 }
4460 break;
4461 #endif
4462
4463 case MCLOSE + 0: /* Match end: \ze */
4464 case MCLOSE + 1: /* \) */
4465 case MCLOSE + 2:
4466 case MCLOSE + 3:
4467 case MCLOSE + 4:
4468 case MCLOSE + 5:
4469 case MCLOSE + 6:
4470 case MCLOSE + 7:
4471 case MCLOSE + 8:
4472 case MCLOSE + 9:
4473 {
4474 no = op - MCLOSE;
4475 cleanup_subexpr();
4476 rp = regstack_push(RS_MCLOSE, scan);
4477 if (rp == NULL)
4478 status = RA_FAIL;
4479 else
4480 {
4481 rp->rs_no = no;
4482 save_se(&rp->rs_un.sesave, &reg_endpos[no], &reg_endp[no]);
4483 /* We simply continue and handle the result when done. */
4484 }
4485 }
4486 break;
4487
4488 #ifdef FEAT_SYN_HL
4489 case ZCLOSE + 1: /* \) after \z( */
4490 case ZCLOSE + 2:
4491 case ZCLOSE + 3:
4492 case ZCLOSE + 4:
4493 case ZCLOSE + 5:
4494 case ZCLOSE + 6:
4495 case ZCLOSE + 7:
4496 case ZCLOSE + 8:
4497 case ZCLOSE + 9:
4498 {
4499 no = op - ZCLOSE;
4500 cleanup_zsubexpr();
4501 rp = regstack_push(RS_ZCLOSE, scan);
4502 if (rp == NULL)
4503 status = RA_FAIL;
4504 else
4505 {
4506 rp->rs_no = no;
4507 save_se(&rp->rs_un.sesave, &reg_endzpos[no],
4508 &reg_endzp[no]);
4509 /* We simply continue and handle the result when done. */
4510 }
4511 }
4512 break;
4513 #endif
4514
4515 case BACKREF + 1:
4516 case BACKREF + 2:
4517 case BACKREF + 3:
4518 case BACKREF + 4:
4519 case BACKREF + 5:
4520 case BACKREF + 6:
4521 case BACKREF + 7:
4522 case BACKREF + 8:
4523 case BACKREF + 9:
4524 {
4525 int len;
4526 linenr_T clnum;
4527 colnr_T ccol;
4528 char_u *p;
4529
4530 no = op - BACKREF;
4531 cleanup_subexpr();
4532 if (!REG_MULTI) /* Single-line regexp */
4533 {
4534 if (reg_startp[no] == NULL || reg_endp[no] == NULL)
4535 {
4536 /* Backref was not set: Match an empty string. */
4537 len = 0;
4538 }
4539 else
4540 {
4541 /* Compare current input with back-ref in the same
4542 * line. */
4543 len = (int)(reg_endp[no] - reg_startp[no]);
4544 if (cstrncmp(reg_startp[no], reginput, &len) != 0)
4545 status = RA_NOMATCH;
4546 }
4547 }
4548 else /* Multi-line regexp */
4549 {
4550 if (reg_startpos[no].lnum < 0 || reg_endpos[no].lnum < 0)
4551 {
4552 /* Backref was not set: Match an empty string. */
4553 len = 0;
4554 }
4555 else
4556 {
4557 if (reg_startpos[no].lnum == reglnum
4558 && reg_endpos[no].lnum == reglnum)
4559 {
4560 /* Compare back-ref within the current line. */
4561 len = reg_endpos[no].col - reg_startpos[no].col;
4562 if (cstrncmp(regline + reg_startpos[no].col,
4563 reginput, &len) != 0)
4564 status = RA_NOMATCH;
4565 }
4566 else
4567 {
4568 /* Messy situation: Need to compare between two
4569 * lines. */
4570 ccol = reg_startpos[no].col;
4571 clnum = reg_startpos[no].lnum;
4572 for (;;)
4573 {
4574 /* Since getting one line may invalidate
4575 * the other, need to make copy. Slow! */
4576 if (regline != reg_tofree)
4577 {
4578 len = (int)STRLEN(regline);
4579 if (reg_tofree == NULL
4580 || len >= (int)reg_tofreelen)
4581 {
4582 len += 50; /* get some extra */
4583 vim_free(reg_tofree);
4584 reg_tofree = alloc(len);
4585 if (reg_tofree == NULL)
4586 {
4587 status = RA_FAIL; /* outof memory!*/
4588 break;
4589 }
4590 reg_tofreelen = len;
4591 }
4592 STRCPY(reg_tofree, regline);
4593 reginput = reg_tofree
4594 + (reginput - regline);
4595 regline = reg_tofree;
4596 }
4597
4598 /* Get the line to compare with. */
4599 p = reg_getline(clnum);
4600 if (clnum == reg_endpos[no].lnum)
4601 len = reg_endpos[no].col - ccol;
4602 else
4603 len = (int)STRLEN(p + ccol);
4604
4605 if (cstrncmp(p + ccol, reginput, &len) != 0)
4606 {
4607 status = RA_NOMATCH; /* doesn't match */
4608 break;
4609 }
4610 if (clnum == reg_endpos[no].lnum)
4611 break; /* match and at end! */
4612 if (reglnum >= reg_maxline)
4613 {
4614 status = RA_NOMATCH; /* text too short */
4615 break;
4616 }
4617
4618 /* Advance to next line. */
4619 reg_nextline();
4620 ++clnum;
4621 ccol = 0;
4622 if (got_int)
4623 {
4624 status = RA_FAIL;
4625 break;
4626 }
4627 }
4628
4629 /* found a match! Note that regline may now point
4630 * to a copy of the line, that should not matter. */
4631 }
4632 }
4633 }
4634
4635 /* Matched the backref, skip over it. */
4636 reginput += len;
4637 }
4638 break;
4639
4640 #ifdef FEAT_SYN_HL
4641 case ZREF + 1:
4642 case ZREF + 2:
4643 case ZREF + 3:
4644 case ZREF + 4:
4645 case ZREF + 5:
4646 case ZREF + 6:
4647 case ZREF + 7:
4648 case ZREF + 8:
4649 case ZREF + 9:
4650 {
4651 int len;
4652
4653 cleanup_zsubexpr();
4654 no = op - ZREF;
4655 if (re_extmatch_in != NULL
4656 && re_extmatch_in->matches[no] != NULL)
4657 {
4658 len = (int)STRLEN(re_extmatch_in->matches[no]);
4659 if (cstrncmp(re_extmatch_in->matches[no],
4660 reginput, &len) != 0)
4661 status = RA_NOMATCH;
4662 else
4663 reginput += len;
4664 }
4665 else
4666 {
4667 /* Backref was not set: Match an empty string. */
4668 }
4669 }
4670 break;
4671 #endif
4672
4673 case BRANCH:
4674 {
4675 if (OP(next) != BRANCH) /* No choice. */
4676 next = OPERAND(scan); /* Avoid recursion. */
4677 else
4678 {
4679 rp = regstack_push(RS_BRANCH, scan);
4680 if (rp == NULL)
4681 status = RA_FAIL;
4682 else
4683 status = RA_BREAK; /* rest is below */
4684 }
4685 }
4686 break;
4687
4688 case BRACE_LIMITS:
4689 {
4690 if (OP(next) == BRACE_SIMPLE)
4691 {
4692 bl_minval = OPERAND_MIN(scan);
4693 bl_maxval = OPERAND_MAX(scan);
4694 }
4695 else if (OP(next) >= BRACE_COMPLEX
4696 && OP(next) < BRACE_COMPLEX + 10)
4697 {
4698 no = OP(next) - BRACE_COMPLEX;
4699 brace_min[no] = OPERAND_MIN(scan);
4700 brace_max[no] = OPERAND_MAX(scan);
4701 brace_count[no] = 0;
4702 }
4703 else
4704 {
4705 EMSG(_(e_internal)); /* Shouldn't happen */
4706 status = RA_FAIL;
4707 }
4708 }
4709 break;
4710
4711 case BRACE_COMPLEX + 0:
4712 case BRACE_COMPLEX + 1:
4713 case BRACE_COMPLEX + 2:
4714 case BRACE_COMPLEX + 3:
4715 case BRACE_COMPLEX + 4:
4716 case BRACE_COMPLEX + 5:
4717 case BRACE_COMPLEX + 6:
4718 case BRACE_COMPLEX + 7:
4719 case BRACE_COMPLEX + 8:
4720 case BRACE_COMPLEX + 9:
4721 {
4722 no = op - BRACE_COMPLEX;
4723 ++brace_count[no];
4724
4725 /* If not matched enough times yet, try one more */
4726 if (brace_count[no] <= (brace_min[no] <= brace_max[no]
4727 ? brace_min[no] : brace_max[no]))
4728 {
4729 rp = regstack_push(RS_BRCPLX_MORE, scan);
4730 if (rp == NULL)
4731 status = RA_FAIL;
4732 else
4733 {
4734 rp->rs_no = no;
4735 reg_save(&rp->rs_un.regsave, &backpos);
4736 next = OPERAND(scan);
4737 /* We continue and handle the result when done. */
4738 }
4739 break;
4740 }
4741
4742 /* If matched enough times, may try matching some more */
4743 if (brace_min[no] <= brace_max[no])
4744 {
4745 /* Range is the normal way around, use longest match */
4746 if (brace_count[no] <= brace_max[no])
4747 {
4748 rp = regstack_push(RS_BRCPLX_LONG, scan);
4749 if (rp == NULL)
4750 status = RA_FAIL;
4751 else
4752 {
4753 rp->rs_no = no;
4754 reg_save(&rp->rs_un.regsave, &backpos);
4755 next = OPERAND(scan);
4756 /* We continue and handle the result when done. */
4757 }
4758 }
4759 }
4760 else
4761 {
4762 /* Range is backwards, use shortest match first */
4763 if (brace_count[no] <= brace_min[no])
4764 {
4765 rp = regstack_push(RS_BRCPLX_SHORT, scan);
4766 if (rp == NULL)
4767 status = RA_FAIL;
4768 else
4769 {
4770 reg_save(&rp->rs_un.regsave, &backpos);
4771 /* We continue and handle the result when done. */
4772 }
4773 }
4774 }
4775 }
4776 break;
4777
4778 case BRACE_SIMPLE:
4779 case STAR:
4780 case PLUS:
4781 {
4782 regstar_T rst;
4783
4784 /*
4785 * Lookahead to avoid useless match attempts when we know
4786 * what character comes next.
4787 */
4788 if (OP(next) == EXACTLY)
4789 {
4790 rst.nextb = *OPERAND(next);
4791 if (ireg_ic)
4792 {
4793 if (MB_ISUPPER(rst.nextb))
4794 rst.nextb_ic = MB_TOLOWER(rst.nextb);
4795 else
4796 rst.nextb_ic = MB_TOUPPER(rst.nextb);
4797 }
4798 else
4799 rst.nextb_ic = rst.nextb;
4800 }
4801 else
4802 {
4803 rst.nextb = NUL;
4804 rst.nextb_ic = NUL;
4805 }
4806 if (op != BRACE_SIMPLE)
4807 {
4808 rst.minval = (op == STAR) ? 0 : 1;
4809 rst.maxval = MAX_LIMIT;
4810 }
4811 else
4812 {
4813 rst.minval = bl_minval;
4814 rst.maxval = bl_maxval;
4815 }
4816
4817 /*
4818 * When maxval > minval, try matching as much as possible, up
4819 * to maxval. When maxval < minval, try matching at least the
4820 * minimal number (since the range is backwards, that's also
4821 * maxval!).
4822 */
4823 rst.count = regrepeat(OPERAND(scan), rst.maxval);
4824 if (got_int)
4825 {
4826 status = RA_FAIL;
4827 break;
4828 }
4829 if (rst.minval <= rst.maxval
4830 ? rst.count >= rst.minval : rst.count >= rst.maxval)
4831 {
4832 /* It could match. Prepare for trying to match what
4833 * follows. The code is below. Parameters are stored in
4834 * a regstar_T on the regstack. */
4835 if ((long)((unsigned)regstack.ga_len >> 10) >= p_mmp)
4836 {
4837 EMSG(_(e_maxmempat));
4838 status = RA_FAIL;
4839 }
4840 else if (ga_grow(&regstack, sizeof(regstar_T)) == FAIL)
4841 status = RA_FAIL;
4842 else
4843 {
4844 regstack.ga_len += sizeof(regstar_T);
4845 rp = regstack_push(rst.minval <= rst.maxval
4846 ? RS_STAR_LONG : RS_STAR_SHORT, scan);
4847 if (rp == NULL)
4848 status = RA_FAIL;
4849 else
4850 {
4851 *(((regstar_T *)rp) - 1) = rst;
4852 status = RA_BREAK; /* skip the restore bits */
4853 }
4854 }
4855 }
4856 else
4857 status = RA_NOMATCH;
4858
4859 }
4860 break;
4861
4862 case NOMATCH:
4863 case MATCH:
4864 case SUBPAT:
4865 rp = regstack_push(RS_NOMATCH, scan);
4866 if (rp == NULL)
4867 status = RA_FAIL;
4868 else
4869 {
4870 rp->rs_no = op;
4871 reg_save(&rp->rs_un.regsave, &backpos);
4872 next = OPERAND(scan);
4873 /* We continue and handle the result when done. */
4874 }
4875 break;
4876
4877 case BEHIND:
4878 case NOBEHIND:
4879 /* Need a bit of room to store extra positions. */
4880 if ((long)((unsigned)regstack.ga_len >> 10) >= p_mmp)
4881 {
4882 EMSG(_(e_maxmempat));
4883 status = RA_FAIL;
4884 }
4885 else if (ga_grow(&regstack, sizeof(regbehind_T)) == FAIL)
4886 status = RA_FAIL;
4887 else
4888 {
4889 regstack.ga_len += sizeof(regbehind_T);
4890 rp = regstack_push(RS_BEHIND1, scan);
4891 if (rp == NULL)
4892 status = RA_FAIL;
4893 else
4894 {
4895 /* Need to save the subexpr to be able to restore them
4896 * when there is a match but we don't use it. */
4897 save_subexpr(((regbehind_T *)rp) - 1);
4898
4899 rp->rs_no = op;
4900 reg_save(&rp->rs_un.regsave, &backpos);
4901 /* First try if what follows matches. If it does then we
4902 * check the behind match by looping. */
4903 }
4904 }
4905 break;
4906
4907 case BHPOS:
4908 if (REG_MULTI)
4909 {
4910 if (behind_pos.rs_u.pos.col != (colnr_T)(reginput - regline)
4911 || behind_pos.rs_u.pos.lnum != reglnum)
4912 status = RA_NOMATCH;
4913 }
4914 else if (behind_pos.rs_u.ptr != reginput)
4915 status = RA_NOMATCH;
4916 break;
4917
4918 case NEWL:
4919 if ((c != NUL || !REG_MULTI || reglnum > reg_maxline
4920 || reg_line_lbr) && (c != '\n' || !reg_line_lbr))
4921 status = RA_NOMATCH;
4922 else if (reg_line_lbr)
4923 ADVANCE_REGINPUT();
4924 else
4925 reg_nextline();
4926 break;
4927
4928 case END:
4929 status = RA_MATCH; /* Success! */
4930 break;
4931
4932 default:
4933 EMSG(_(e_re_corr));
4934 #ifdef DEBUG
4935 printf("Illegal op code %d\n", op);
4936 #endif
4937 status = RA_FAIL;
4938 break;
4939 }
4940 }
4941
4942 /* If we can't continue sequentially, break the inner loop. */
4943 if (status != RA_CONT)
4944 break;
4945
4946 /* Continue in inner loop, advance to next item. */
4947 scan = next;
4948
4949 } /* end of inner loop */
4950
4951 /*
4952 * If there is something on the regstack execute the code for the state.
4953 * If the state is popped then loop and use the older state.
4954 */
4955 while (regstack.ga_len > 0 && status != RA_FAIL)
4956 {
4957 rp = (regitem_T *)((char *)regstack.ga_data + regstack.ga_len) - 1;
4958 switch (rp->rs_state)
4959 {
4960 case RS_NOPEN:
4961 /* Result is passed on as-is, simply pop the state. */
4962 regstack_pop(&scan);
4963 break;
4964
4965 case RS_MOPEN:
4966 /* Pop the state. Restore pointers when there is no match. */
4967 if (status == RA_NOMATCH)
4968 restore_se(&rp->rs_un.sesave, &reg_startpos[rp->rs_no],
4969 &reg_startp[rp->rs_no]);
4970 regstack_pop(&scan);
4971 break;
4972
4973 #ifdef FEAT_SYN_HL
4974 case RS_ZOPEN:
4975 /* Pop the state. Restore pointers when there is no match. */
4976 if (status == RA_NOMATCH)
4977 restore_se(&rp->rs_un.sesave, &reg_startzpos[rp->rs_no],
4978 &reg_startzp[rp->rs_no]);
4979 regstack_pop(&scan);
4980 break;
4981 #endif
4982
4983 case RS_MCLOSE:
4984 /* Pop the state. Restore pointers when there is no match. */
4985 if (status == RA_NOMATCH)
4986 restore_se(&rp->rs_un.sesave, &reg_endpos[rp->rs_no],
4987 &reg_endp[rp->rs_no]);
4988 regstack_pop(&scan);
4989 break;
4990
4991 #ifdef FEAT_SYN_HL
4992 case RS_ZCLOSE:
4993 /* Pop the state. Restore pointers when there is no match. */
4994 if (status == RA_NOMATCH)
4995 restore_se(&rp->rs_un.sesave, &reg_endzpos[rp->rs_no],
4996 &reg_endzp[rp->rs_no]);
4997 regstack_pop(&scan);
4998 break;
4999 #endif
5000
5001 case RS_BRANCH:
5002 if (status == RA_MATCH)
5003 /* this branch matched, use it */
5004 regstack_pop(&scan);
5005 else
5006 {
5007 if (status != RA_BREAK)
5008 {
5009 /* After a non-matching branch: try next one. */
5010 reg_restore(&rp->rs_un.regsave, &backpos);
5011 scan = rp->rs_scan;
5012 }
5013 if (scan == NULL || OP(scan) != BRANCH)
5014 {
5015 /* no more branches, didn't find a match */
5016 status = RA_NOMATCH;
5017 regstack_pop(&scan);
5018 }
5019 else
5020 {
5021 /* Prepare to try a branch. */
5022 rp->rs_scan = regnext(scan);
5023 reg_save(&rp->rs_un.regsave, &backpos);
5024 scan = OPERAND(scan);
5025 }
5026 }
5027 break;
5028
5029 case RS_BRCPLX_MORE:
5030 /* Pop the state. Restore pointers when there is no match. */
5031 if (status == RA_NOMATCH)
5032 {
5033 reg_restore(&rp->rs_un.regsave, &backpos);
5034 --brace_count[rp->rs_no]; /* decrement match count */
5035 }
5036 regstack_pop(&scan);
5037 break;
5038
5039 case RS_BRCPLX_LONG:
5040 /* Pop the state. Restore pointers when there is no match. */
5041 if (status == RA_NOMATCH)
5042 {
5043 /* There was no match, but we did find enough matches. */
5044 reg_restore(&rp->rs_un.regsave, &backpos);
5045 --brace_count[rp->rs_no];
5046 /* continue with the items after "\{}" */
5047 status = RA_CONT;
5048 }
5049 regstack_pop(&scan);
5050 if (status == RA_CONT)
5051 scan = regnext(scan);
5052 break;
5053
5054 case RS_BRCPLX_SHORT:
5055 /* Pop the state. Restore pointers when there is no match. */
5056 if (status == RA_NOMATCH)
5057 /* There was no match, try to match one more item. */
5058 reg_restore(&rp->rs_un.regsave, &backpos);
5059 regstack_pop(&scan);
5060 if (status == RA_NOMATCH)
5061 {
5062 scan = OPERAND(scan);
5063 status = RA_CONT;
5064 }
5065 break;
5066
5067 case RS_NOMATCH:
5068 /* Pop the state. If the operand matches for NOMATCH or
5069 * doesn't match for MATCH/SUBPAT, we fail. Otherwise backup,
5070 * except for SUBPAT, and continue with the next item. */
5071 if (status == (rp->rs_no == NOMATCH ? RA_MATCH : RA_NOMATCH))
5072 status = RA_NOMATCH;
5073 else
5074 {
5075 status = RA_CONT;
5076 if (rp->rs_no != SUBPAT) /* zero-width */
5077 reg_restore(&rp->rs_un.regsave, &backpos);
5078 }
5079 regstack_pop(&scan);
5080 if (status == RA_CONT)
5081 scan = regnext(scan);
5082 break;
5083
5084 case RS_BEHIND1:
5085 if (status == RA_NOMATCH)
5086 {
5087 regstack_pop(&scan);
5088 regstack.ga_len -= sizeof(regbehind_T);
5089 }
5090 else
5091 {
5092 /* The stuff after BEHIND/NOBEHIND matches. Now try if
5093 * the behind part does (not) match before the current
5094 * position in the input. This must be done at every
5095 * position in the input and checking if the match ends at
5096 * the current position. */
5097
5098 /* save the position after the found match for next */
5099 reg_save(&(((regbehind_T *)rp) - 1)->save_after, &backpos);
5100
5101 /* start looking for a match with operand at the current
5102 * position. Go back one character until we find the
5103 * result, hitting the start of the line or the previous
5104 * line (for multi-line matching).
5105 * Set behind_pos to where the match should end, BHPOS
5106 * will match it. Save the current value. */
5107 (((regbehind_T *)rp) - 1)->save_behind = behind_pos;
5108 behind_pos = rp->rs_un.regsave;
5109
5110 rp->rs_state = RS_BEHIND2;
5111
5112 reg_restore(&rp->rs_un.regsave, &backpos);
5113 scan = OPERAND(rp->rs_scan);
5114 }
5115 break;
5116
5117 case RS_BEHIND2:
5118 /*
5119 * Looping for BEHIND / NOBEHIND match.
5120 */
5121 if (status == RA_MATCH && reg_save_equal(&behind_pos))
5122 {
5123 /* found a match that ends where "next" started */
5124 behind_pos = (((regbehind_T *)rp) - 1)->save_behind;
5125 if (rp->rs_no == BEHIND)
5126 reg_restore(&(((regbehind_T *)rp) - 1)->save_after,
5127 &backpos);
5128 else
5129 {
5130 /* But we didn't want a match. Need to restore the
5131 * subexpr, because what follows matched, so they have
5132 * been set. */
5133 status = RA_NOMATCH;
5134 restore_subexpr(((regbehind_T *)rp) - 1);
5135 }
5136 regstack_pop(&scan);
5137 regstack.ga_len -= sizeof(regbehind_T);
5138 }
5139 else
5140 {
5141 /* No match or a match that doesn't end where we want it: Go
5142 * back one character. May go to previous line once. */
5143 no = OK;
5144 if (REG_MULTI)
5145 {
5146 if (rp->rs_un.regsave.rs_u.pos.col == 0)
5147 {
5148 if (rp->rs_un.regsave.rs_u.pos.lnum
5149 < behind_pos.rs_u.pos.lnum
5150 || reg_getline(
5151 --rp->rs_un.regsave.rs_u.pos.lnum)
5152 == NULL)
5153 no = FAIL;
5154 else
5155 {
5156 reg_restore(&rp->rs_un.regsave, &backpos);
5157 rp->rs_un.regsave.rs_u.pos.col =
5158 (colnr_T)STRLEN(regline);
5159 }
5160 }
5161 else
5162 --rp->rs_un.regsave.rs_u.pos.col;
5163 }
5164 else
5165 {
5166 if (rp->rs_un.regsave.rs_u.ptr == regline)
5167 no = FAIL;
5168 else
5169 --rp->rs_un.regsave.rs_u.ptr;
5170 }
5171 if (no == OK)
5172 {
5173 /* Advanced, prepare for finding match again. */
5174 reg_restore(&rp->rs_un.regsave, &backpos);
5175 scan = OPERAND(rp->rs_scan);
5176 if (status == RA_MATCH)
5177 {
5178 /* We did match, so subexpr may have been changed,
5179 * need to restore them for the next try. */
5180 status = RA_NOMATCH;
5181 restore_subexpr(((regbehind_T *)rp) - 1);
5182 }
5183 }
5184 else
5185 {
5186 /* Can't advance. For NOBEHIND that's a match. */
5187 behind_pos = (((regbehind_T *)rp) - 1)->save_behind;
5188 if (rp->rs_no == NOBEHIND)
5189 {
5190 reg_restore(&(((regbehind_T *)rp) - 1)->save_after,
5191 &backpos);
5192 status = RA_MATCH;
5193 }
5194 else
5195 {
5196 /* We do want a proper match. Need to restore the
5197 * subexpr if we had a match, because they may have
5198 * been set. */
5199 if (status == RA_MATCH)
5200 {
5201 status = RA_NOMATCH;
5202 restore_subexpr(((regbehind_T *)rp) - 1);
5203 }
5204 }
5205 regstack_pop(&scan);
5206 regstack.ga_len -= sizeof(regbehind_T);
5207 }
5208 }
5209 break;
5210
5211 case RS_STAR_LONG:
5212 case RS_STAR_SHORT:
5213 {
5214 regstar_T *rst = ((regstar_T *)rp) - 1;
5215
5216 if (status == RA_MATCH)
5217 {
5218 regstack_pop(&scan);
5219 regstack.ga_len -= sizeof(regstar_T);
5220 break;
5221 }
5222
5223 /* Tried once already, restore input pointers. */
5224 if (status != RA_BREAK)
5225 reg_restore(&rp->rs_un.regsave, &backpos);
5226
5227 /* Repeat until we found a position where it could match. */
5228 for (;;)
5229 {
5230 if (status != RA_BREAK)
5231 {
5232 /* Tried first position already, advance. */
5233 if (rp->rs_state == RS_STAR_LONG)
5234 {
5235 /* Trying for longest match, but couldn't or
5236 * didn't match -- back up one char. */
5237 if (--rst->count < rst->minval)
5238 break;
5239 if (reginput == regline)
5240 {
5241 /* backup to last char of previous line */
5242 --reglnum;
5243 regline = reg_getline(reglnum);
5244 /* Just in case regrepeat() didn't count
5245 * right. */
5246 if (regline == NULL)
5247 break;
5248 reginput = regline + STRLEN(regline);
5249 fast_breakcheck();
5250 }
5251 else
5252 mb_ptr_back(regline, reginput);
5253 }
5254 else
5255 {
5256 /* Range is backwards, use shortest match first.
5257 * Careful: maxval and minval are exchanged!
5258 * Couldn't or didn't match: try advancing one
5259 * char. */
5260 if (rst->count == rst->minval
5261 || regrepeat(OPERAND(rp->rs_scan), 1L) == 0)
5262 break;
5263 ++rst->count;
5264 }
5265 if (got_int)
5266 break;
5267 }
5268 else
5269 status = RA_NOMATCH;
5270
5271 /* If it could match, try it. */
5272 if (rst->nextb == NUL || *reginput == rst->nextb
5273 || *reginput == rst->nextb_ic)
5274 {
5275 reg_save(&rp->rs_un.regsave, &backpos);
5276 scan = regnext(rp->rs_scan);
5277 status = RA_CONT;
5278 break;
5279 }
5280 }
5281 if (status != RA_CONT)
5282 {
5283 /* Failed. */
5284 regstack_pop(&scan);
5285 regstack.ga_len -= sizeof(regstar_T);
5286 status = RA_NOMATCH;
5287 }
5288 }
5289 break;
5290 }
5291
5292 /* If we want to continue the inner loop or didn't pop a state
5293 * continue matching loop */
5294 if (status == RA_CONT || rp == (regitem_T *)
5295 ((char *)regstack.ga_data + regstack.ga_len) - 1)
5296 break;
5297 }
5298
5299 /* May need to continue with the inner loop, starting at "scan". */
5300 if (status == RA_CONT)
5301 continue;
5302
5303 /*
5304 * If the regstack is empty or something failed we are done.
5305 */
5306 if (regstack.ga_len == 0 || status == RA_FAIL)
5307 {
5308 if (scan == NULL)
5309 {
5310 /*
5311 * We get here only if there's trouble -- normally "case END" is
5312 * the terminating point.
5313 */
5314 EMSG(_(e_re_corr));
5315 #ifdef DEBUG
5316 printf("Premature EOL\n");
5317 #endif
5318 }
5319 if (status == RA_FAIL)
5320 got_int = TRUE;
5321 return (status == RA_MATCH);
5322 }
5323
5324 } /* End of loop until the regstack is empty. */
5325
5326 /* NOTREACHED */
5327 }
5328
5329 /*
5330 * Push an item onto the regstack.
5331 * Returns pointer to new item. Returns NULL when out of memory.
5332 */
5333 static regitem_T *
5334 regstack_push(state, scan)
5335 regstate_T state;
5336 char_u *scan;
5337 {
5338 regitem_T *rp;
5339
5340 if ((long)((unsigned)regstack.ga_len >> 10) >= p_mmp)
5341 {
5342 EMSG(_(e_maxmempat));
5343 return NULL;
5344 }
5345 if (ga_grow(&regstack, sizeof(regitem_T)) == FAIL)
5346 return NULL;
5347
5348 rp = (regitem_T *)((char *)regstack.ga_data + regstack.ga_len);
5349 rp->rs_state = state;
5350 rp->rs_scan = scan;
5351
5352 regstack.ga_len += sizeof(regitem_T);
5353 return rp;
5354 }
5355
5356 /*
5357 * Pop an item from the regstack.
5358 */
5359 static void
5360 regstack_pop(scan)
5361 char_u **scan;
5362 {
5363 regitem_T *rp;
5364
5365 rp = (regitem_T *)((char *)regstack.ga_data + regstack.ga_len) - 1;
5366 *scan = rp->rs_scan;
5367
5368 regstack.ga_len -= sizeof(regitem_T);
5369 }
5370
5371 /*
5372 * regrepeat - repeatedly match something simple, return how many.
5373 * Advances reginput (and reglnum) to just after the matched chars.
5374 */
5375 static int
5376 regrepeat(p, maxcount)
5377 char_u *p;
5378 long maxcount; /* maximum number of matches allowed */
5379 {
5380 long count = 0;
5381 char_u *scan;
5382 char_u *opnd;
5383 int mask;
5384 int testval = 0;
5385
5386 scan = reginput; /* Make local copy of reginput for speed. */
5387 opnd = OPERAND(p);
5388 switch (OP(p))
5389 {
5390 case ANY:
5391 case ANY + ADD_NL:
5392 while (count < maxcount)
5393 {
5394 /* Matching anything means we continue until end-of-line (or
5395 * end-of-file for ANY + ADD_NL), only limited by maxcount. */
5396 while (*scan != NUL && count < maxcount)
5397 {
5398 ++count;
5399 mb_ptr_adv(scan);
5400 }
5401 if (!REG_MULTI || !WITH_NL(OP(p)) || reglnum > reg_maxline
5402 || reg_line_lbr || count == maxcount)
5403 break;
5404 ++count; /* count the line-break */
5405 reg_nextline();
5406 scan = reginput;
5407 if (got_int)
5408 break;
5409 }
5410 break;
5411
5412 case IDENT:
5413 case IDENT + ADD_NL:
5414 testval = TRUE;
5415 /*FALLTHROUGH*/
5416 case SIDENT:
5417 case SIDENT + ADD_NL:
5418 while (count < maxcount)
5419 {
5420 if (vim_isIDc(*scan) && (testval || !VIM_ISDIGIT(*scan)))
5421 {
5422 mb_ptr_adv(scan);
5423 }
5424 else if (*scan == NUL)
5425 {
5426 if (!REG_MULTI || !WITH_NL(OP(p)) || reglnum > reg_maxline
5427 || reg_line_lbr)
5428 break;
5429 reg_nextline();
5430 scan = reginput;
5431 if (got_int)
5432 break;
5433 }
5434 else if (reg_line_lbr && *scan == '\n' && WITH_NL(OP(p)))
5435 ++scan;
5436 else
5437 break;
5438 ++count;
5439 }
5440 break;
5441
5442 case KWORD:
5443 case KWORD + ADD_NL:
5444 testval = TRUE;
5445 /*FALLTHROUGH*/
5446 case SKWORD:
5447 case SKWORD + ADD_NL:
5448 while (count < maxcount)
5449 {
5450 if (vim_iswordp(scan) && (testval || !VIM_ISDIGIT(*scan)))
5451 {
5452 mb_ptr_adv(scan);
5453 }
5454 else if (*scan == NUL)
5455 {
5456 if (!REG_MULTI || !WITH_NL(OP(p)) || reglnum > reg_maxline
5457 || reg_line_lbr)
5458 break;
5459 reg_nextline();
5460 scan = reginput;
5461 if (got_int)
5462 break;
5463 }
5464 else if (reg_line_lbr && *scan == '\n' && WITH_NL(OP(p)))
5465 ++scan;
5466 else
5467 break;
5468 ++count;
5469 }
5470 break;
5471
5472 case FNAME:
5473 case FNAME + ADD_NL:
5474 testval = TRUE;
5475 /*FALLTHROUGH*/
5476 case SFNAME:
5477 case SFNAME + ADD_NL:
5478 while (count < maxcount)
5479 {
5480 if (vim_isfilec(*scan) && (testval || !VIM_ISDIGIT(*scan)))
5481 {
5482 mb_ptr_adv(scan);
5483 }
5484 else if (*scan == NUL)
5485 {
5486 if (!REG_MULTI || !WITH_NL(OP(p)) || reglnum > reg_maxline
5487 || reg_line_lbr)
5488 break;
5489 reg_nextline();
5490 scan = reginput;
5491 if (got_int)
5492 break;
5493 }
5494 else if (reg_line_lbr && *scan == '\n' && WITH_NL(OP(p)))
5495 ++scan;
5496 else
5497 break;
5498 ++count;
5499 }
5500 break;
5501
5502 case PRINT:
5503 case PRINT + ADD_NL:
5504 testval = TRUE;
5505 /*FALLTHROUGH*/
5506 case SPRINT:
5507 case SPRINT + ADD_NL:
5508 while (count < maxcount)
5509 {
5510 if (*scan == NUL)
5511 {
5512 if (!REG_MULTI || !WITH_NL(OP(p)) || reglnum > reg_maxline
5513 || reg_line_lbr)
5514 break;
5515 reg_nextline();
5516 scan = reginput;
5517 if (got_int)
5518 break;
5519 }
5520 else if (ptr2cells(scan) == 1 && (testval || !VIM_ISDIGIT(*scan)))
5521 {
5522 mb_ptr_adv(scan);
5523 }
5524 else if (reg_line_lbr && *scan == '\n' && WITH_NL(OP(p)))
5525 ++scan;
5526 else
5527 break;
5528 ++count;
5529 }
5530 break;
5531
5532 case WHITE:
5533 case WHITE + ADD_NL:
5534 testval = mask = RI_WHITE;
5535 do_class:
5536 while (count < maxcount)
5537 {
5538 #ifdef FEAT_MBYTE
5539 int l;
5540 #endif
5541 if (*scan == NUL)
5542 {
5543 if (!REG_MULTI || !WITH_NL(OP(p)) || reglnum > reg_maxline
5544 || reg_line_lbr)
5545 break;
5546 reg_nextline();
5547 scan = reginput;
5548 if (got_int)
5549 break;
5550 }
5551 #ifdef FEAT_MBYTE
5552 else if (has_mbyte && (l = (*mb_ptr2len)(scan)) > 1)
5553 {
5554 if (testval != 0)
5555 break;
5556 scan += l;
5557 }
5558 #endif
5559 else if ((class_tab[*scan] & mask) == testval)
5560 ++scan;
5561 else if (reg_line_lbr && *scan == '\n' && WITH_NL(OP(p)))
5562 ++scan;
5563 else
5564 break;
5565 ++count;
5566 }
5567 break;
5568
5569 case NWHITE:
5570 case NWHITE + ADD_NL:
5571 mask = RI_WHITE;
5572 goto do_class;
5573 case DIGIT:
5574 case DIGIT + ADD_NL:
5575 testval = mask = RI_DIGIT;
5576 goto do_class;
5577 case NDIGIT:
5578 case NDIGIT + ADD_NL:
5579 mask = RI_DIGIT;
5580 goto do_class;
5581 case HEX:
5582 case HEX + ADD_NL:
5583 testval = mask = RI_HEX;
5584 goto do_class;
5585 case NHEX:
5586 case NHEX + ADD_NL:
5587 mask = RI_HEX;
5588 goto do_class;
5589 case OCTAL:
5590 case OCTAL + ADD_NL:
5591 testval = mask = RI_OCTAL;
5592 goto do_class;
5593 case NOCTAL:
5594 case NOCTAL + ADD_NL:
5595 mask = RI_OCTAL;
5596 goto do_class;
5597 case WORD:
5598 case WORD + ADD_NL:
5599 testval = mask = RI_WORD;
5600 goto do_class;
5601 case NWORD:
5602 case NWORD + ADD_NL:
5603 mask = RI_WORD;
5604 goto do_class;
5605 case HEAD:
5606 case HEAD + ADD_NL:
5607 testval = mask = RI_HEAD;
5608 goto do_class;
5609 case NHEAD:
5610 case NHEAD + ADD_NL:
5611 mask = RI_HEAD;
5612 goto do_class;
5613 case ALPHA:
5614 case ALPHA + ADD_NL:
5615 testval = mask = RI_ALPHA;
5616 goto do_class;
5617 case NALPHA:
5618 case NALPHA + ADD_NL:
5619 mask = RI_ALPHA;
5620 goto do_class;
5621 case LOWER:
5622 case LOWER + ADD_NL:
5623 testval = mask = RI_LOWER;
5624 goto do_class;
5625 case NLOWER:
5626 case NLOWER + ADD_NL:
5627 mask = RI_LOWER;
5628 goto do_class;
5629 case UPPER:
5630 case UPPER + ADD_NL:
5631 testval = mask = RI_UPPER;
5632 goto do_class;
5633 case NUPPER:
5634 case NUPPER + ADD_NL:
5635 mask = RI_UPPER;
5636 goto do_class;
5637
5638 case EXACTLY:
5639 {
5640 int cu, cl;
5641
5642 /* This doesn't do a multi-byte character, because a MULTIBYTECODE
5643 * would have been used for it. It does handle single-byte
5644 * characters, such as latin1. */
5645 if (ireg_ic)
5646 {
5647 cu = MB_TOUPPER(*opnd);
5648 cl = MB_TOLOWER(*opnd);
5649 while (count < maxcount && (*scan == cu || *scan == cl))
5650 {
5651 count++;
5652 scan++;
5653 }
5654 }
5655 else
5656 {
5657 cu = *opnd;
5658 while (count < maxcount && *scan == cu)
5659 {
5660 count++;
5661 scan++;
5662 }
5663 }
5664 break;
5665 }
5666
5667 #ifdef FEAT_MBYTE
5668 case MULTIBYTECODE:
5669 {
5670 int i, len, cf = 0;
5671
5672 /* Safety check (just in case 'encoding' was changed since
5673 * compiling the program). */
5674 if ((len = (*mb_ptr2len)(opnd)) > 1)
5675 {
5676 if (ireg_ic && enc_utf8)
5677 cf = utf_fold(utf_ptr2char(opnd));
5678 while (count < maxcount)
5679 {
5680 for (i = 0; i < len; ++i)
5681 if (opnd[i] != scan[i])
5682 break;
5683 if (i < len && (!ireg_ic || !enc_utf8
5684 || utf_fold(utf_ptr2char(scan)) != cf))
5685 break;
5686 scan += len;
5687 ++count;
5688 }
5689 }
5690 }
5691 break;
5692 #endif
5693
5694 case ANYOF:
5695 case ANYOF + ADD_NL:
5696 testval = TRUE;
5697 /*FALLTHROUGH*/
5698
5699 case ANYBUT:
5700 case ANYBUT + ADD_NL:
5701 while (count < maxcount)
5702 {
5703 #ifdef FEAT_MBYTE
5704 int len;
5705 #endif
5706 if (*scan == NUL)
5707 {
5708 if (!REG_MULTI || !WITH_NL(OP(p)) || reglnum > reg_maxline
5709 || reg_line_lbr)
5710 break;
5711 reg_nextline();
5712 scan = reginput;
5713 if (got_int)
5714 break;
5715 }
5716 else if (reg_line_lbr && *scan == '\n' && WITH_NL(OP(p)))
5717 ++scan;
5718 #ifdef FEAT_MBYTE
5719 else if (has_mbyte && (len = (*mb_ptr2len)(scan)) > 1)
5720 {
5721 if ((cstrchr(opnd, (*mb_ptr2char)(scan)) == NULL) == testval)
5722 break;
5723 scan += len;
5724 }
5725 #endif
5726 else
5727 {
5728 if ((cstrchr(opnd, *scan) == NULL) == testval)
5729 break;
5730 ++scan;
5731 }
5732 ++count;
5733 }
5734 break;
5735
5736 case NEWL:
5737 while (count < maxcount
5738 && ((*scan == NUL && reglnum <= reg_maxline && !reg_line_lbr
5739 && REG_MULTI) || (*scan == '\n' && reg_line_lbr)))
5740 {
5741 count++;
5742 if (reg_line_lbr)
5743 ADVANCE_REGINPUT();
5744 else
5745 reg_nextline();
5746 scan = reginput;
5747 if (got_int)
5748 break;
5749 }
5750 break;
5751
5752 default: /* Oh dear. Called inappropriately. */
5753 EMSG(_(e_re_corr));
5754 #ifdef DEBUG
5755 printf("Called regrepeat with op code %d\n", OP(p));
5756 #endif
5757 break;
5758 }
5759
5760 reginput = scan;
5761
5762 return (int)count;
5763 }
5764
5765 /*
5766 * regnext - dig the "next" pointer out of a node
5767 */
5768 static char_u *
5769 regnext(p)
5770 char_u *p;
5771 {
5772 int offset;
5773
5774 if (p == JUST_CALC_SIZE)
5775 return NULL;
5776
5777 offset = NEXT(p);
5778 if (offset == 0)
5779 return NULL;
5780
5781 if (OP(p) == BACK)
5782 return p - offset;
5783 else
5784 return p + offset;
5785 }
5786
5787 /*
5788 * Check the regexp program for its magic number.
5789 * Return TRUE if it's wrong.
5790 */
5791 static int
5792 prog_magic_wrong()
5793 {
5794 if (UCHARAT(REG_MULTI
5795 ? reg_mmatch->regprog->program
5796 : reg_match->regprog->program) != REGMAGIC)
5797 {
5798 EMSG(_(e_re_corr));
5799 return TRUE;
5800 }
5801 return FALSE;
5802 }
5803
5804 /*
5805 * Cleanup the subexpressions, if this wasn't done yet.
5806 * This construction is used to clear the subexpressions only when they are
5807 * used (to increase speed).
5808 */
5809 static void
5810 cleanup_subexpr()
5811 {
5812 if (need_clear_subexpr)
5813 {
5814 if (REG_MULTI)
5815 {
5816 /* Use 0xff to set lnum to -1 */
5817 vim_memset(reg_startpos, 0xff, sizeof(lpos_T) * NSUBEXP);
5818 vim_memset(reg_endpos, 0xff, sizeof(lpos_T) * NSUBEXP);
5819 }
5820 else
5821 {
5822 vim_memset(reg_startp, 0, sizeof(char_u *) * NSUBEXP);
5823 vim_memset(reg_endp, 0, sizeof(char_u *) * NSUBEXP);
5824 }
5825 need_clear_subexpr = FALSE;
5826 }
5827 }
5828
5829 #ifdef FEAT_SYN_HL
5830 static void
5831 cleanup_zsubexpr()
5832 {
5833 if (need_clear_zsubexpr)
5834 {
5835 if (REG_MULTI)
5836 {
5837 /* Use 0xff to set lnum to -1 */
5838 vim_memset(reg_startzpos, 0xff, sizeof(lpos_T) * NSUBEXP);
5839 vim_memset(reg_endzpos, 0xff, sizeof(lpos_T) * NSUBEXP);
5840 }
5841 else
5842 {
5843 vim_memset(reg_startzp, 0, sizeof(char_u *) * NSUBEXP);
5844 vim_memset(reg_endzp, 0, sizeof(char_u *) * NSUBEXP);
5845 }
5846 need_clear_zsubexpr = FALSE;
5847 }
5848 }
5849 #endif
5850
5851 /*
5852 * Save the current subexpr to "bp", so that they can be restored
5853 * later by restore_subexpr().
5854 */
5855 static void
5856 save_subexpr(bp)
5857 regbehind_T *bp;
5858 {
5859 int i;
5860
5861 /* When "need_clear_subexpr" is set we don't need to save the values, only
5862 * remember that this flag needs to be set again when restoring. */
5863 bp->save_need_clear_subexpr = need_clear_subexpr;
5864 if (!need_clear_subexpr)
5865 {
5866 for (i = 0; i < NSUBEXP; ++i)
5867 {
5868 if (REG_MULTI)
5869 {
5870 bp->save_start[i].se_u.pos = reg_startpos[i];
5871 bp->save_end[i].se_u.pos = reg_endpos[i];
5872 }
5873 else
5874 {
5875 bp->save_start[i].se_u.ptr = reg_startp[i];
5876 bp->save_end[i].se_u.ptr = reg_endp[i];
5877 }
5878 }
5879 }
5880 }
5881
5882 /*
5883 * Restore the subexpr from "bp".
5884 */
5885 static void
5886 restore_subexpr(bp)
5887 regbehind_T *bp;
5888 {
5889 int i;
5890
5891 /* Only need to restore saved values when they are not to be cleared. */
5892 need_clear_subexpr = bp->save_need_clear_subexpr;
5893 if (!need_clear_subexpr)
5894 {
5895 for (i = 0; i < NSUBEXP; ++i)
5896 {
5897 if (REG_MULTI)
5898 {
5899 reg_startpos[i] = bp->save_start[i].se_u.pos;
5900 reg_endpos[i] = bp->save_end[i].se_u.pos;
5901 }
5902 else
5903 {
5904 reg_startp[i] = bp->save_start[i].se_u.ptr;
5905 reg_endp[i] = bp->save_end[i].se_u.ptr;
5906 }
5907 }
5908 }
5909 }
5910
5911 /*
5912 * Advance reglnum, regline and reginput to the next line.
5913 */
5914 static void
5915 reg_nextline()
5916 {
5917 regline = reg_getline(++reglnum);
5918 reginput = regline;
5919 fast_breakcheck();
5920 }
5921
5922 /*
5923 * Save the input line and position in a regsave_T.
5924 */
5925 static void
5926 reg_save(save, gap)
5927 regsave_T *save;
5928 garray_T *gap;
5929 {
5930 if (REG_MULTI)
5931 {
5932 save->rs_u.pos.col = (colnr_T)(reginput - regline);
5933 save->rs_u.pos.lnum = reglnum;
5934 }
5935 else
5936 save->rs_u.ptr = reginput;
5937 save->rs_len = gap->ga_len;
5938 }
5939
5940 /*
5941 * Restore the input line and position from a regsave_T.
5942 */
5943 static void
5944 reg_restore(save, gap)
5945 regsave_T *save;
5946 garray_T *gap;
5947 {
5948 if (REG_MULTI)
5949 {
5950 if (reglnum != save->rs_u.pos.lnum)
5951 {
5952 /* only call reg_getline() when the line number changed to save
5953 * a bit of time */
5954 reglnum = save->rs_u.pos.lnum;
5955 regline = reg_getline(reglnum);
5956 }
5957 reginput = regline + save->rs_u.pos.col;
5958 }
5959 else
5960 reginput = save->rs_u.ptr;
5961 gap->ga_len = save->rs_len;
5962 }
5963
5964 /*
5965 * Return TRUE if current position is equal to saved position.
5966 */
5967 static int
5968 reg_save_equal(save)
5969 regsave_T *save;
5970 {
5971 if (REG_MULTI)
5972 return reglnum == save->rs_u.pos.lnum
5973 && reginput == regline + save->rs_u.pos.col;
5974 return reginput == save->rs_u.ptr;
5975 }
5976
5977 /*
5978 * Tentatively set the sub-expression start to the current position (after
5979 * calling regmatch() they will have changed). Need to save the existing
5980 * values for when there is no match.
5981 * Use se_save() to use pointer (save_se_multi()) or position (save_se_one()),
5982 * depending on REG_MULTI.
5983 */
5984 static void
5985 save_se_multi(savep, posp)
5986 save_se_T *savep;
5987 lpos_T *posp;
5988 {
5989 savep->se_u.pos = *posp;
5990 posp->lnum = reglnum;
5991 posp->col = (colnr_T)(reginput - regline);
5992 }
5993
5994 static void
5995 save_se_one(savep, pp)
5996 save_se_T *savep;
5997 char_u **pp;
5998 {
5999 savep->se_u.ptr = *pp;
6000 *pp = reginput;
6001 }
6002
6003 /*
6004 * Compare a number with the operand of RE_LNUM, RE_COL or RE_VCOL.
6005 */
6006 static int
6007 re_num_cmp(val, scan)
6008 long_u val;
6009 char_u *scan;
6010 {
6011 long_u n = OPERAND_MIN(scan);
6012
6013 if (OPERAND_CMP(scan) == '>')
6014 return val > n;
6015 if (OPERAND_CMP(scan) == '<')
6016 return val < n;
6017 return val == n;
6018 }
6019
6020
6021 #ifdef DEBUG
6022
6023 /*
6024 * regdump - dump a regexp onto stdout in vaguely comprehensible form
6025 */
6026 static void
6027 regdump(pattern, r)
6028 char_u *pattern;
6029 regprog_T *r;
6030 {
6031 char_u *s;
6032 int op = EXACTLY; /* Arbitrary non-END op. */
6033 char_u *next;
6034 char_u *end = NULL;
6035
6036 printf("\r\nregcomp(%s):\r\n", pattern);
6037
6038 s = r->program + 1;
6039 /*
6040 * Loop until we find the END that isn't before a referred next (an END
6041 * can also appear in a NOMATCH operand).
6042 */
6043 while (op != END || s <= end)
6044 {
6045 op = OP(s);
6046 printf("%2d%s", (int)(s - r->program), regprop(s)); /* Where, what. */
6047 next = regnext(s);
6048 if (next == NULL) /* Next ptr. */
6049 printf("(0)");
6050 else
6051 printf("(%d)", (int)((s - r->program) + (next - s)));
6052 if (end < next)
6053 end = next;
6054 if (op == BRACE_LIMITS)
6055 {
6056 /* Two short ints */
6057 printf(" minval %ld, maxval %ld", OPERAND_MIN(s), OPERAND_MAX(s));
6058 s += 8;
6059 }
6060 s += 3;
6061 if (op == ANYOF || op == ANYOF + ADD_NL
6062 || op == ANYBUT || op == ANYBUT + ADD_NL
6063 || op == EXACTLY)
6064 {
6065 /* Literal string, where present. */
6066 while (*s != NUL)
6067 printf("%c", *s++);
6068 s++;
6069 }
6070 printf("\r\n");
6071 }
6072
6073 /* Header fields of interest. */
6074 if (r->regstart != NUL)
6075 printf("start `%s' 0x%x; ", r->regstart < 256
6076 ? (char *)transchar(r->regstart)
6077 : "multibyte", r->regstart);
6078 if (r->reganch)
6079 printf("anchored; ");
6080 if (r->regmust != NULL)
6081 printf("must have \"%s\"", r->regmust);
6082 printf("\r\n");
6083 }
6084
6085 /*
6086 * regprop - printable representation of opcode
6087 */
6088 static char_u *
6089 regprop(op)
6090 char_u *op;
6091 {
6092 char_u *p;
6093 static char_u buf[50];
6094
6095 (void) strcpy(buf, ":");
6096
6097 switch (OP(op))
6098 {
6099 case BOL:
6100 p = "BOL";
6101 break;
6102 case EOL:
6103 p = "EOL";
6104 break;
6105 case RE_BOF:
6106 p = "BOF";
6107 break;
6108 case RE_EOF:
6109 p = "EOF";
6110 break;
6111 case CURSOR:
6112 p = "CURSOR";
6113 break;
6114 case RE_VISUAL:
6115 p = "RE_VISUAL";
6116 break;
6117 case RE_LNUM:
6118 p = "RE_LNUM";
6119 break;
6120 case RE_MARK:
6121 p = "RE_MARK";
6122 break;
6123 case RE_COL:
6124 p = "RE_COL";
6125 break;
6126 case RE_VCOL:
6127 p = "RE_VCOL";
6128 break;
6129 case BOW:
6130 p = "BOW";
6131 break;
6132 case EOW:
6133 p = "EOW";
6134 break;
6135 case ANY:
6136 p = "ANY";
6137 break;
6138 case ANY + ADD_NL:
6139 p = "ANY+NL";
6140 break;
6141 case ANYOF:
6142 p = "ANYOF";
6143 break;
6144 case ANYOF + ADD_NL:
6145 p = "ANYOF+NL";
6146 break;
6147 case ANYBUT:
6148 p = "ANYBUT";
6149 break;
6150 case ANYBUT + ADD_NL:
6151 p = "ANYBUT+NL";
6152 break;
6153 case IDENT:
6154 p = "IDENT";
6155 break;
6156 case IDENT + ADD_NL:
6157 p = "IDENT+NL";
6158 break;
6159 case SIDENT:
6160 p = "SIDENT";
6161 break;
6162 case SIDENT + ADD_NL:
6163 p = "SIDENT+NL";
6164 break;
6165 case KWORD:
6166 p = "KWORD";
6167 break;
6168 case KWORD + ADD_NL:
6169 p = "KWORD+NL";
6170 break;
6171 case SKWORD:
6172 p = "SKWORD";
6173 break;
6174 case SKWORD + ADD_NL:
6175 p = "SKWORD+NL";
6176 break;
6177 case FNAME:
6178 p = "FNAME";
6179 break;
6180 case FNAME + ADD_NL:
6181 p = "FNAME+NL";
6182 break;
6183 case SFNAME:
6184 p = "SFNAME";
6185 break;
6186 case SFNAME + ADD_NL:
6187 p = "SFNAME+NL";
6188 break;
6189 case PRINT:
6190 p = "PRINT";
6191 break;
6192 case PRINT + ADD_NL:
6193 p = "PRINT+NL";
6194 break;
6195 case SPRINT:
6196 p = "SPRINT";
6197 break;
6198 case SPRINT + ADD_NL:
6199 p = "SPRINT+NL";
6200 break;
6201 case WHITE:
6202 p = "WHITE";
6203 break;
6204 case WHITE + ADD_NL:
6205 p = "WHITE+NL";
6206 break;
6207 case NWHITE:
6208 p = "NWHITE";
6209 break;
6210 case NWHITE + ADD_NL:
6211 p = "NWHITE+NL";
6212 break;
6213 case DIGIT:
6214 p = "DIGIT";
6215 break;
6216 case DIGIT + ADD_NL:
6217 p = "DIGIT+NL";
6218 break;
6219 case NDIGIT:
6220 p = "NDIGIT";
6221 break;
6222 case NDIGIT + ADD_NL:
6223 p = "NDIGIT+NL";
6224 break;
6225 case HEX:
6226 p = "HEX";
6227 break;
6228 case HEX + ADD_NL:
6229 p = "HEX+NL";
6230 break;
6231 case NHEX:
6232 p = "NHEX";
6233 break;
6234 case NHEX + ADD_NL:
6235 p = "NHEX+NL";
6236 break;
6237 case OCTAL:
6238 p = "OCTAL";
6239 break;
6240 case OCTAL + ADD_NL:
6241 p = "OCTAL+NL";
6242 break;
6243 case NOCTAL:
6244 p = "NOCTAL";
6245 break;
6246 case NOCTAL + ADD_NL:
6247 p = "NOCTAL+NL";
6248 break;
6249 case WORD:
6250 p = "WORD";
6251 break;
6252 case WORD + ADD_NL:
6253 p = "WORD+NL";
6254 break;
6255 case NWORD:
6256 p = "NWORD";
6257 break;
6258 case NWORD + ADD_NL:
6259 p = "NWORD+NL";
6260 break;
6261 case HEAD:
6262 p = "HEAD";
6263 break;
6264 case HEAD + ADD_NL:
6265 p = "HEAD+NL";
6266 break;
6267 case NHEAD:
6268 p = "NHEAD";
6269 break;
6270 case NHEAD + ADD_NL:
6271 p = "NHEAD+NL";
6272 break;
6273 case ALPHA:
6274 p = "ALPHA";
6275 break;
6276 case ALPHA + ADD_NL:
6277 p = "ALPHA+NL";
6278 break;
6279 case NALPHA:
6280 p = "NALPHA";
6281 break;
6282 case NALPHA + ADD_NL:
6283 p = "NALPHA+NL";
6284 break;
6285 case LOWER:
6286 p = "LOWER";
6287 break;
6288 case LOWER + ADD_NL:
6289 p = "LOWER+NL";
6290 break;
6291 case NLOWER:
6292 p = "NLOWER";
6293 break;
6294 case NLOWER + ADD_NL:
6295 p = "NLOWER+NL";
6296 break;
6297 case UPPER:
6298 p = "UPPER";
6299 break;
6300 case UPPER + ADD_NL:
6301 p = "UPPER+NL";
6302 break;
6303 case NUPPER:
6304 p = "NUPPER";
6305 break;
6306 case NUPPER + ADD_NL:
6307 p = "NUPPER+NL";
6308 break;
6309 case BRANCH:
6310 p = "BRANCH";
6311 break;
6312 case EXACTLY:
6313 p = "EXACTLY";
6314 break;
6315 case NOTHING:
6316 p = "NOTHING";
6317 break;
6318 case BACK:
6319 p = "BACK";
6320 break;
6321 case END:
6322 p = "END";
6323 break;
6324 case MOPEN + 0:
6325 p = "MATCH START";
6326 break;
6327 case MOPEN + 1:
6328 case MOPEN + 2:
6329 case MOPEN + 3:
6330 case MOPEN + 4:
6331 case MOPEN + 5:
6332 case MOPEN + 6:
6333 case MOPEN + 7:
6334 case MOPEN + 8:
6335 case MOPEN + 9:
6336 sprintf(buf + STRLEN(buf), "MOPEN%d", OP(op) - MOPEN);
6337 p = NULL;
6338 break;
6339 case MCLOSE + 0:
6340 p = "MATCH END";
6341 break;
6342 case MCLOSE + 1:
6343 case MCLOSE + 2:
6344 case MCLOSE + 3:
6345 case MCLOSE + 4:
6346 case MCLOSE + 5:
6347 case MCLOSE + 6:
6348 case MCLOSE + 7:
6349 case MCLOSE + 8:
6350 case MCLOSE + 9:
6351 sprintf(buf + STRLEN(buf), "MCLOSE%d", OP(op) - MCLOSE);
6352 p = NULL;
6353 break;
6354 case BACKREF + 1:
6355 case BACKREF + 2:
6356 case BACKREF + 3:
6357 case BACKREF + 4:
6358 case BACKREF + 5:
6359 case BACKREF + 6:
6360 case BACKREF + 7:
6361 case BACKREF + 8:
6362 case BACKREF + 9:
6363 sprintf(buf + STRLEN(buf), "BACKREF%d", OP(op) - BACKREF);
6364 p = NULL;
6365 break;
6366 case NOPEN:
6367 p = "NOPEN";
6368 break;
6369 case NCLOSE:
6370 p = "NCLOSE";
6371 break;
6372 #ifdef FEAT_SYN_HL
6373 case ZOPEN + 1:
6374 case ZOPEN + 2:
6375 case ZOPEN + 3:
6376 case ZOPEN + 4:
6377 case ZOPEN + 5:
6378 case ZOPEN + 6:
6379 case ZOPEN + 7:
6380 case ZOPEN + 8:
6381 case ZOPEN + 9:
6382 sprintf(buf + STRLEN(buf), "ZOPEN%d", OP(op) - ZOPEN);
6383 p = NULL;
6384 break;
6385 case ZCLOSE + 1:
6386 case ZCLOSE + 2:
6387 case ZCLOSE + 3:
6388 case ZCLOSE + 4:
6389 case ZCLOSE + 5:
6390 case ZCLOSE + 6:
6391 case ZCLOSE + 7:
6392 case ZCLOSE + 8:
6393 case ZCLOSE + 9:
6394 sprintf(buf + STRLEN(buf), "ZCLOSE%d", OP(op) - ZCLOSE);
6395 p = NULL;
6396 break;
6397 case ZREF + 1:
6398 case ZREF + 2:
6399 case ZREF + 3:
6400 case ZREF + 4:
6401 case ZREF + 5:
6402 case ZREF + 6:
6403 case ZREF + 7:
6404 case ZREF + 8:
6405 case ZREF + 9:
6406 sprintf(buf + STRLEN(buf), "ZREF%d", OP(op) - ZREF);
6407 p = NULL;
6408 break;
6409 #endif
6410 case STAR:
6411 p = "STAR";
6412 break;
6413 case PLUS:
6414 p = "PLUS";
6415 break;
6416 case NOMATCH:
6417 p = "NOMATCH";
6418 break;
6419 case MATCH:
6420 p = "MATCH";
6421 break;
6422 case BEHIND:
6423 p = "BEHIND";
6424 break;
6425 case NOBEHIND:
6426 p = "NOBEHIND";
6427 break;
6428 case SUBPAT:
6429 p = "SUBPAT";
6430 break;
6431 case BRACE_LIMITS:
6432 p = "BRACE_LIMITS";
6433 break;
6434 case BRACE_SIMPLE:
6435 p = "BRACE_SIMPLE";
6436 break;
6437 case BRACE_COMPLEX + 0:
6438 case BRACE_COMPLEX + 1:
6439 case BRACE_COMPLEX + 2:
6440 case BRACE_COMPLEX + 3:
6441 case BRACE_COMPLEX + 4:
6442 case BRACE_COMPLEX + 5:
6443 case BRACE_COMPLEX + 6:
6444 case BRACE_COMPLEX + 7:
6445 case BRACE_COMPLEX + 8:
6446 case BRACE_COMPLEX + 9:
6447 sprintf(buf + STRLEN(buf), "BRACE_COMPLEX%d", OP(op) - BRACE_COMPLEX);
6448 p = NULL;
6449 break;
6450 #ifdef FEAT_MBYTE
6451 case MULTIBYTECODE:
6452 p = "MULTIBYTECODE";
6453 break;
6454 #endif
6455 case NEWL:
6456 p = "NEWL";
6457 break;
6458 default:
6459 sprintf(buf + STRLEN(buf), "corrupt %d", OP(op));
6460 p = NULL;
6461 break;
6462 }
6463 if (p != NULL)
6464 (void) strcat(buf, p);
6465 return buf;
6466 }
6467 #endif
6468
6469 #ifdef FEAT_MBYTE
6470 static void mb_decompose __ARGS((int c, int *c1, int *c2, int *c3));
6471
6472 typedef struct
6473 {
6474 int a, b, c;
6475 } decomp_T;
6476
6477
6478 /* 0xfb20 - 0xfb4f */
6479 static decomp_T decomp_table[0xfb4f-0xfb20+1] =
6480 {
6481 {0x5e2,0,0}, /* 0xfb20 alt ayin */
6482 {0x5d0,0,0}, /* 0xfb21 alt alef */
6483 {0x5d3,0,0}, /* 0xfb22 alt dalet */
6484 {0x5d4,0,0}, /* 0xfb23 alt he */
6485 {0x5db,0,0}, /* 0xfb24 alt kaf */
6486 {0x5dc,0,0}, /* 0xfb25 alt lamed */
6487 {0x5dd,0,0}, /* 0xfb26 alt mem-sofit */
6488 {0x5e8,0,0}, /* 0xfb27 alt resh */
6489 {0x5ea,0,0}, /* 0xfb28 alt tav */
6490 {'+', 0, 0}, /* 0xfb29 alt plus */
6491 {0x5e9, 0x5c1, 0}, /* 0xfb2a shin+shin-dot */
6492 {0x5e9, 0x5c2, 0}, /* 0xfb2b shin+sin-dot */
6493 {0x5e9, 0x5c1, 0x5bc}, /* 0xfb2c shin+shin-dot+dagesh */
6494 {0x5e9, 0x5c2, 0x5bc}, /* 0xfb2d shin+sin-dot+dagesh */
6495 {0x5d0, 0x5b7, 0}, /* 0xfb2e alef+patah */
6496 {0x5d0, 0x5b8, 0}, /* 0xfb2f alef+qamats */
6497 {0x5d0, 0x5b4, 0}, /* 0xfb30 alef+hiriq */
6498 {0x5d1, 0x5bc, 0}, /* 0xfb31 bet+dagesh */
6499 {0x5d2, 0x5bc, 0}, /* 0xfb32 gimel+dagesh */
6500 {0x5d3, 0x5bc, 0}, /* 0xfb33 dalet+dagesh */
6501 {0x5d4, 0x5bc, 0}, /* 0xfb34 he+dagesh */
6502 {0x5d5, 0x5bc, 0}, /* 0xfb35 vav+dagesh */
6503 {0x5d6, 0x5bc, 0}, /* 0xfb36 zayin+dagesh */
6504 {0xfb37, 0, 0}, /* 0xfb37 -- UNUSED */
6505 {0x5d8, 0x5bc, 0}, /* 0xfb38 tet+dagesh */
6506 {0x5d9, 0x5bc, 0}, /* 0xfb39 yud+dagesh */
6507 {0x5da, 0x5bc, 0}, /* 0xfb3a kaf sofit+dagesh */
6508 {0x5db, 0x5bc, 0}, /* 0xfb3b kaf+dagesh */
6509 {0x5dc, 0x5bc, 0}, /* 0xfb3c lamed+dagesh */
6510 {0xfb3d, 0, 0}, /* 0xfb3d -- UNUSED */
6511 {0x5de, 0x5bc, 0}, /* 0xfb3e mem+dagesh */
6512 {0xfb3f, 0, 0}, /* 0xfb3f -- UNUSED */
6513 {0x5e0, 0x5bc, 0}, /* 0xfb40 nun+dagesh */
6514 {0x5e1, 0x5bc, 0}, /* 0xfb41 samech+dagesh */
6515 {0xfb42, 0, 0}, /* 0xfb42 -- UNUSED */
6516 {0x5e3, 0x5bc, 0}, /* 0xfb43 pe sofit+dagesh */
6517 {0x5e4, 0x5bc,0}, /* 0xfb44 pe+dagesh */
6518 {0xfb45, 0, 0}, /* 0xfb45 -- UNUSED */
6519 {0x5e6, 0x5bc, 0}, /* 0xfb46 tsadi+dagesh */
6520 {0x5e7, 0x5bc, 0}, /* 0xfb47 qof+dagesh */
6521 {0x5e8, 0x5bc, 0}, /* 0xfb48 resh+dagesh */
6522 {0x5e9, 0x5bc, 0}, /* 0xfb49 shin+dagesh */
6523 {0x5ea, 0x5bc, 0}, /* 0xfb4a tav+dagesh */
6524 {0x5d5, 0x5b9, 0}, /* 0xfb4b vav+holam */
6525 {0x5d1, 0x5bf, 0}, /* 0xfb4c bet+rafe */
6526 {0x5db, 0x5bf, 0}, /* 0xfb4d kaf+rafe */
6527 {0x5e4, 0x5bf, 0}, /* 0xfb4e pe+rafe */
6528 {0x5d0, 0x5dc, 0} /* 0xfb4f alef-lamed */
6529 };
6530
6531 static void
6532 mb_decompose(c, c1, c2, c3)
6533 int c, *c1, *c2, *c3;
6534 {
6535 decomp_T d;
6536
6537 if (c >= 0x4b20 && c <= 0xfb4f)
6538 {
6539 d = decomp_table[c - 0xfb20];
6540 *c1 = d.a;
6541 *c2 = d.b;
6542 *c3 = d.c;
6543 }
6544 else
6545 {
6546 *c1 = c;
6547 *c2 = *c3 = 0;
6548 }
6549 }
6550 #endif
6551
6552 /*
6553 * Compare two strings, ignore case if ireg_ic set.
6554 * Return 0 if strings match, non-zero otherwise.
6555 * Correct the length "*n" when composing characters are ignored.
6556 */
6557 static int
6558 cstrncmp(s1, s2, n)
6559 char_u *s1, *s2;
6560 int *n;
6561 {
6562 int result;
6563
6564 if (!ireg_ic)
6565 result = STRNCMP(s1, s2, *n);
6566 else
6567 result = MB_STRNICMP(s1, s2, *n);
6568
6569 #ifdef FEAT_MBYTE
6570 /* if it failed and it's utf8 and we want to combineignore: */
6571 if (result != 0 && enc_utf8 && ireg_icombine)
6572 {
6573 char_u *str1, *str2;
6574 int c1, c2, c11, c12;
6575 int junk;
6576
6577 /* we have to handle the strcmp ourselves, since it is necessary to
6578 * deal with the composing characters by ignoring them: */
6579 str1 = s1;
6580 str2 = s2;
6581 c1 = c2 = 0;
6582 while ((int)(str1 - s1) < *n)
6583 {
6584 c1 = mb_ptr2char_adv(&str1);
6585 c2 = mb_ptr2char_adv(&str2);
6586
6587 /* decompose the character if necessary, into 'base' characters
6588 * because I don't care about Arabic, I will hard-code the Hebrew
6589 * which I *do* care about! So sue me... */
6590 if (c1 != c2 && (!ireg_ic || utf_fold(c1) != utf_fold(c2)))
6591 {
6592 /* decomposition necessary? */
6593 mb_decompose(c1, &c11, &junk, &junk);
6594 mb_decompose(c2, &c12, &junk, &junk);
6595 c1 = c11;
6596 c2 = c12;
6597 if (c11 != c12 && (!ireg_ic || utf_fold(c11) != utf_fold(c12)))
6598 break;
6599 }
6600 }
6601 result = c2 - c1;
6602 if (result == 0)
6603 *n = (int)(str2 - s2);
6604 }
6605 #endif
6606
6607 return result;
6608 }
6609
6610 /*
6611 * cstrchr: This function is used a lot for simple searches, keep it fast!
6612 */
6613 static char_u *
6614 cstrchr(s, c)
6615 char_u *s;
6616 int c;
6617 {
6618 char_u *p;
6619 int cc;
6620
6621 if (!ireg_ic
6622 #ifdef FEAT_MBYTE
6623 || (!enc_utf8 && mb_char2len(c) > 1)
6624 #endif
6625 )
6626 return vim_strchr(s, c);
6627
6628 /* tolower() and toupper() can be slow, comparing twice should be a lot
6629 * faster (esp. when using MS Visual C++!).
6630 * For UTF-8 need to use folded case. */
6631 #ifdef FEAT_MBYTE
6632 if (enc_utf8 && c > 0x80)
6633 cc = utf_fold(c);
6634 else
6635 #endif
6636 if (MB_ISUPPER(c))
6637 cc = MB_TOLOWER(c);
6638 else if (MB_ISLOWER(c))
6639 cc = MB_TOUPPER(c);
6640 else
6641 return vim_strchr(s, c);
6642
6643 #ifdef FEAT_MBYTE
6644 if (has_mbyte)
6645 {
6646 for (p = s; *p != NUL; p += (*mb_ptr2len)(p))
6647 {
6648 if (enc_utf8 && c > 0x80)
6649 {
6650 if (utf_fold(utf_ptr2char(p)) == cc)
6651 return p;
6652 }
6653 else if (*p == c || *p == cc)
6654 return p;
6655 }
6656 }
6657 else
6658 #endif
6659 /* Faster version for when there are no multi-byte characters. */
6660 for (p = s; *p != NUL; ++p)
6661 if (*p == c || *p == cc)
6662 return p;
6663
6664 return NULL;
6665 }
6666
6667 /***************************************************************
6668 * regsub stuff *
6669 ***************************************************************/
6670
6671 /* This stuff below really confuses cc on an SGI -- webb */
6672 #ifdef __sgi
6673 # undef __ARGS
6674 # define __ARGS(x) ()
6675 #endif
6676
6677 /*
6678 * We should define ftpr as a pointer to a function returning a pointer to
6679 * a function returning a pointer to a function ...
6680 * This is impossible, so we declare a pointer to a function returning a
6681 * pointer to a function returning void. This should work for all compilers.
6682 */
6683 typedef void (*(*fptr_T) __ARGS((int *, int)))();
6684
6685 static fptr_T do_upper __ARGS((int *, int));
6686 static fptr_T do_Upper __ARGS((int *, int));
6687 static fptr_T do_lower __ARGS((int *, int));
6688 static fptr_T do_Lower __ARGS((int *, int));
6689
6690 static int vim_regsub_both __ARGS((char_u *source, char_u *dest, int copy, int magic, int backslash));
6691
6692 static fptr_T
6693 do_upper(d, c)
6694 int *d;
6695 int c;
6696 {
6697 *d = MB_TOUPPER(c);
6698
6699 return (fptr_T)NULL;
6700 }
6701
6702 static fptr_T
6703 do_Upper(d, c)
6704 int *d;
6705 int c;
6706 {
6707 *d = MB_TOUPPER(c);
6708
6709 return (fptr_T)do_Upper;
6710 }
6711
6712 static fptr_T
6713 do_lower(d, c)
6714 int *d;
6715 int c;
6716 {
6717 *d = MB_TOLOWER(c);
6718
6719 return (fptr_T)NULL;
6720 }
6721
6722 static fptr_T
6723 do_Lower(d, c)
6724 int *d;
6725 int c;
6726 {
6727 *d = MB_TOLOWER(c);
6728
6729 return (fptr_T)do_Lower;
6730 }
6731
6732 /*
6733 * regtilde(): Replace tildes in the pattern by the old pattern.
6734 *
6735 * Short explanation of the tilde: It stands for the previous replacement
6736 * pattern. If that previous pattern also contains a ~ we should go back a
6737 * step further... But we insert the previous pattern into the current one
6738 * and remember that.
6739 * This still does not handle the case where "magic" changes. So require the
6740 * user to keep his hands off of "magic".
6741 *
6742 * The tildes are parsed once before the first call to vim_regsub().
6743 */
6744 char_u *
6745 regtilde(source, magic)
6746 char_u *source;
6747 int magic;
6748 {
6749 char_u *newsub = source;
6750 char_u *tmpsub;
6751 char_u *p;
6752 int len;
6753 int prevlen;
6754
6755 for (p = newsub; *p; ++p)
6756 {
6757 if ((*p == '~' && magic) || (*p == '\\' && *(p + 1) == '~' && !magic))
6758 {
6759 if (reg_prev_sub != NULL)
6760 {
6761 /* length = len(newsub) - 1 + len(prev_sub) + 1 */
6762 prevlen = (int)STRLEN(reg_prev_sub);
6763 tmpsub = alloc((unsigned)(STRLEN(newsub) + prevlen));
6764 if (tmpsub != NULL)
6765 {
6766 /* copy prefix */
6767 len = (int)(p - newsub); /* not including ~ */
6768 mch_memmove(tmpsub, newsub, (size_t)len);
6769 /* interpret tilde */
6770 mch_memmove(tmpsub + len, reg_prev_sub, (size_t)prevlen);
6771 /* copy postfix */
6772 if (!magic)
6773 ++p; /* back off \ */
6774 STRCPY(tmpsub + len + prevlen, p + 1);
6775
6776 if (newsub != source) /* already allocated newsub */
6777 vim_free(newsub);
6778 newsub = tmpsub;
6779 p = newsub + len + prevlen;
6780 }
6781 }
6782 else if (magic)
6783 STRMOVE(p, p + 1); /* remove '~' */
6784 else
6785 STRMOVE(p, p + 2); /* remove '\~' */
6786 --p;
6787 }
6788 else
6789 {
6790 if (*p == '\\' && p[1]) /* skip escaped characters */
6791 ++p;
6792 #ifdef FEAT_MBYTE
6793 if (has_mbyte)
6794 p += (*mb_ptr2len)(p) - 1;
6795 #endif
6796 }
6797 }
6798
6799 vim_free(reg_prev_sub);
6800 if (newsub != source) /* newsub was allocated, just keep it */
6801 reg_prev_sub = newsub;
6802 else /* no ~ found, need to save newsub */
6803 reg_prev_sub = vim_strsave(newsub);
6804 return newsub;
6805 }
6806
6807 #ifdef FEAT_EVAL
6808 static int can_f_submatch = FALSE; /* TRUE when submatch() can be used */
6809
6810 /* These pointers are used instead of reg_match and reg_mmatch for
6811 * reg_submatch(). Needed for when the substitution string is an expression
6812 * that contains a call to substitute() and submatch(). */
6813 static regmatch_T *submatch_match;
6814 static regmmatch_T *submatch_mmatch;
6815 #endif
6816
6817 #if defined(FEAT_MODIFY_FNAME) || defined(FEAT_EVAL) || defined(PROTO)
6818 /*
6819 * vim_regsub() - perform substitutions after a vim_regexec() or
6820 * vim_regexec_multi() match.
6821 *
6822 * If "copy" is TRUE really copy into "dest".
6823 * If "copy" is FALSE nothing is copied, this is just to find out the length
6824 * of the result.
6825 *
6826 * If "backslash" is TRUE, a backslash will be removed later, need to double
6827 * them to keep them, and insert a backslash before a CR to avoid it being
6828 * replaced with a line break later.
6829 *
6830 * Note: The matched text must not change between the call of
6831 * vim_regexec()/vim_regexec_multi() and vim_regsub()! It would make the back
6832 * references invalid!
6833 *
6834 * Returns the size of the replacement, including terminating NUL.
6835 */
6836 int
6837 vim_regsub(rmp, source, dest, copy, magic, backslash)
6838 regmatch_T *rmp;
6839 char_u *source;
6840 char_u *dest;
6841 int copy;
6842 int magic;
6843 int backslash;
6844 {
6845 reg_match = rmp;
6846 reg_mmatch = NULL;
6847 reg_maxline = 0;
6848 return vim_regsub_both(source, dest, copy, magic, backslash);
6849 }
6850 #endif
6851
6852 int
6853 vim_regsub_multi(rmp, lnum, source, dest, copy, magic, backslash)
6854 regmmatch_T *rmp;
6855 linenr_T lnum;
6856 char_u *source;
6857 char_u *dest;
6858 int copy;
6859 int magic;
6860 int backslash;
6861 {
6862 reg_match = NULL;
6863 reg_mmatch = rmp;
6864 reg_buf = curbuf; /* always works on the current buffer! */
6865 reg_firstlnum = lnum;
6866 reg_maxline = curbuf->b_ml.ml_line_count - lnum;
6867 return vim_regsub_both(source, dest, copy, magic, backslash);
6868 }
6869
6870 static int
6871 vim_regsub_both(source, dest, copy, magic, backslash)
6872 char_u *source;
6873 char_u *dest;
6874 int copy;
6875 int magic;
6876 int backslash;
6877 {
6878 char_u *src;
6879 char_u *dst;
6880 char_u *s;
6881 int c;
6882 int cc;
6883 int no = -1;
6884 fptr_T func = (fptr_T)NULL;
6885 linenr_T clnum = 0; /* init for GCC */
6886 int len = 0; /* init for GCC */
6887 #ifdef FEAT_EVAL
6888 static char_u *eval_result = NULL;
6889 #endif
6890
6891 /* Be paranoid... */
6892 if (source == NULL || dest == NULL)
6893 {
6894 EMSG(_(e_null));
6895 return 0;
6896 }
6897 if (prog_magic_wrong())
6898 return 0;
6899 src = source;
6900 dst = dest;
6901
6902 /*
6903 * When the substitute part starts with "\=" evaluate it as an expression.
6904 */
6905 if (source[0] == '\\' && source[1] == '='
6906 #ifdef FEAT_EVAL
6907 && !can_f_submatch /* can't do this recursively */
6908 #endif
6909 )
6910 {
6911 #ifdef FEAT_EVAL
6912 /* To make sure that the length doesn't change between checking the
6913 * length and copying the string, and to speed up things, the
6914 * resulting string is saved from the call with "copy" == FALSE to the
6915 * call with "copy" == TRUE. */
6916 if (copy)
6917 {
6918 if (eval_result != NULL)
6919 {
6920 STRCPY(dest, eval_result);
6921 dst += STRLEN(eval_result);
6922 vim_free(eval_result);
6923 eval_result = NULL;
6924 }
6925 }
6926 else
6927 {
6928 linenr_T save_reg_maxline;
6929 win_T *save_reg_win;
6930 int save_ireg_ic;
6931
6932 vim_free(eval_result);
6933
6934 /* The expression may contain substitute(), which calls us
6935 * recursively. Make sure submatch() gets the text from the first
6936 * level. Don't need to save "reg_buf", because
6937 * vim_regexec_multi() can't be called recursively. */
6938 submatch_match = reg_match;
6939 submatch_mmatch = reg_mmatch;
6940 save_reg_maxline = reg_maxline;
6941 save_reg_win = reg_win;
6942 save_ireg_ic = ireg_ic;
6943 can_f_submatch = TRUE;
6944
6945 eval_result = eval_to_string(source + 2, NULL, TRUE);
6946 if (eval_result != NULL)
6947 {
6948 for (s = eval_result; *s != NUL; mb_ptr_adv(s))
6949 {
6950 /* Change NL to CR, so that it becomes a line break.
6951 * Skip over a backslashed character. */
6952 if (*s == NL)
6953 *s = CAR;
6954 else if (*s == '\\' && s[1] != NUL)
6955 ++s;
6956 }
6957
6958 dst += STRLEN(eval_result);
6959 }
6960
6961 reg_match = submatch_match;
6962 reg_mmatch = submatch_mmatch;
6963 reg_maxline = save_reg_maxline;
6964 reg_win = save_reg_win;
6965 ireg_ic = save_ireg_ic;
6966 can_f_submatch = FALSE;
6967 }
6968 #endif
6969 }
6970 else
6971 while ((c = *src++) != NUL)
6972 {
6973 if (c == '&' && magic)
6974 no = 0;
6975 else if (c == '\\' && *src != NUL)
6976 {
6977 if (*src == '&' && !magic)
6978 {
6979 ++src;
6980 no = 0;
6981 }
6982 else if ('0' <= *src && *src <= '9')
6983 {
6984 no = *src++ - '0';
6985 }
6986 else if (vim_strchr((char_u *)"uUlLeE", *src))
6987 {
6988 switch (*src++)
6989 {
6990 case 'u': func = (fptr_T)do_upper;
6991 continue;
6992 case 'U': func = (fptr_T)do_Upper;
6993 continue;
6994 case 'l': func = (fptr_T)do_lower;
6995 continue;
6996 case 'L': func = (fptr_T)do_Lower;
6997 continue;
6998 case 'e':
6999 case 'E': func = (fptr_T)NULL;
7000 continue;
7001 }
7002 }
7003 }
7004 if (no < 0) /* Ordinary character. */
7005 {
7006 if (c == K_SPECIAL && src[0] != NUL && src[1] != NUL)
7007 {
7008 /* Copy a special key as-is. */
7009 if (copy)
7010 {
7011 *dst++ = c;
7012 *dst++ = *src++;
7013 *dst++ = *src++;
7014 }
7015 else
7016 {
7017 dst += 3;
7018 src += 2;
7019 }
7020 continue;
7021 }
7022
7023 if (c == '\\' && *src != NUL)
7024 {
7025 /* Check for abbreviations -- webb */
7026 switch (*src)
7027 {
7028 case 'r': c = CAR; ++src; break;
7029 case 'n': c = NL; ++src; break;
7030 case 't': c = TAB; ++src; break;
7031 /* Oh no! \e already has meaning in subst pat :-( */
7032 /* case 'e': c = ESC; ++src; break; */
7033 case 'b': c = Ctrl_H; ++src; break;
7034
7035 /* If "backslash" is TRUE the backslash will be removed
7036 * later. Used to insert a literal CR. */
7037 default: if (backslash)
7038 {
7039 if (copy)
7040 *dst = '\\';
7041 ++dst;
7042 }
7043 c = *src++;
7044 }
7045 }
7046 #ifdef FEAT_MBYTE
7047 else if (has_mbyte)
7048 c = mb_ptr2char(src - 1);
7049 #endif
7050
7051 /* Write to buffer, if copy is set. */
7052 if (func == (fptr_T)NULL) /* just copy */
7053 cc = c;
7054 else
7055 /* Turbo C complains without the typecast */
7056 func = (fptr_T)(func(&cc, c));
7057
7058 #ifdef FEAT_MBYTE
7059 if (has_mbyte)
7060 {
7061 src += mb_ptr2len(src - 1) - 1;
7062 if (copy)
7063 mb_char2bytes(cc, dst);
7064 dst += mb_char2len(cc) - 1;
7065 }
7066 else
7067 #endif
7068 if (copy)
7069 *dst = cc;
7070 dst++;
7071 }
7072 else
7073 {
7074 if (REG_MULTI)
7075 {
7076 clnum = reg_mmatch->startpos[no].lnum;
7077 if (clnum < 0 || reg_mmatch->endpos[no].lnum < 0)
7078 s = NULL;
7079 else
7080 {
7081 s = reg_getline(clnum) + reg_mmatch->startpos[no].col;
7082 if (reg_mmatch->endpos[no].lnum == clnum)
7083 len = reg_mmatch->endpos[no].col
7084 - reg_mmatch->startpos[no].col;
7085 else
7086 len = (int)STRLEN(s);
7087 }
7088 }
7089 else
7090 {
7091 s = reg_match->startp[no];
7092 if (reg_match->endp[no] == NULL)
7093 s = NULL;
7094 else
7095 len = (int)(reg_match->endp[no] - s);
7096 }
7097 if (s != NULL)
7098 {
7099 for (;;)
7100 {
7101 if (len == 0)
7102 {
7103 if (REG_MULTI)
7104 {
7105 if (reg_mmatch->endpos[no].lnum == clnum)
7106 break;
7107 if (copy)
7108 *dst = CAR;
7109 ++dst;
7110 s = reg_getline(++clnum);
7111 if (reg_mmatch->endpos[no].lnum == clnum)
7112 len = reg_mmatch->endpos[no].col;
7113 else
7114 len = (int)STRLEN(s);
7115 }
7116 else
7117 break;
7118 }
7119 else if (*s == NUL) /* we hit NUL. */
7120 {
7121 if (copy)
7122 EMSG(_(e_re_damg));
7123 goto exit;
7124 }
7125 else
7126 {
7127 if (backslash && (*s == CAR || *s == '\\'))
7128 {
7129 /*
7130 * Insert a backslash in front of a CR, otherwise
7131 * it will be replaced by a line break.
7132 * Number of backslashes will be halved later,
7133 * double them here.
7134 */
7135 if (copy)
7136 {
7137 dst[0] = '\\';
7138 dst[1] = *s;
7139 }
7140 dst += 2;
7141 }
7142 else
7143 {
7144 #ifdef FEAT_MBYTE
7145 if (has_mbyte)
7146 c = mb_ptr2char(s);
7147 else
7148 #endif
7149 c = *s;
7150
7151 if (func == (fptr_T)NULL) /* just copy */
7152 cc = c;
7153 else
7154 /* Turbo C complains without the typecast */
7155 func = (fptr_T)(func(&cc, c));
7156
7157 #ifdef FEAT_MBYTE
7158 if (has_mbyte)
7159 {
7160 int l;
7161
7162 /* Copy composing characters separately, one
7163 * at a time. */
7164 if (enc_utf8)
7165 l = utf_ptr2len(s) - 1;
7166 else
7167 l = mb_ptr2len(s) - 1;
7168
7169 s += l;
7170 len -= l;
7171 if (copy)
7172 mb_char2bytes(cc, dst);
7173 dst += mb_char2len(cc) - 1;
7174 }
7175 else
7176 #endif
7177 if (copy)
7178 *dst = cc;
7179 dst++;
7180 }
7181
7182 ++s;
7183 --len;
7184 }
7185 }
7186 }
7187 no = -1;
7188 }
7189 }
7190 if (copy)
7191 *dst = NUL;
7192
7193 exit:
7194 return (int)((dst - dest) + 1);
7195 }
7196
7197 #ifdef FEAT_EVAL
7198 /*
7199 * Used for the submatch() function: get the string from the n'th submatch in
7200 * allocated memory.
7201 * Returns NULL when not in a ":s" command and for a non-existing submatch.
7202 */
7203 char_u *
7204 reg_submatch(no)
7205 int no;
7206 {
7207 char_u *retval = NULL;
7208 char_u *s;
7209 int len;
7210 int round;
7211 linenr_T lnum;
7212
7213 if (!can_f_submatch || no < 0)
7214 return NULL;
7215
7216 if (submatch_match == NULL)
7217 {
7218 /*
7219 * First round: compute the length and allocate memory.
7220 * Second round: copy the text.
7221 */
7222 for (round = 1; round <= 2; ++round)
7223 {
7224 lnum = submatch_mmatch->startpos[no].lnum;
7225 if (lnum < 0 || submatch_mmatch->endpos[no].lnum < 0)
7226 return NULL;
7227
7228 s = reg_getline(lnum) + submatch_mmatch->startpos[no].col;
7229 if (s == NULL) /* anti-crash check, cannot happen? */
7230 break;
7231 if (submatch_mmatch->endpos[no].lnum == lnum)
7232 {
7233 /* Within one line: take form start to end col. */
7234 len = submatch_mmatch->endpos[no].col
7235 - submatch_mmatch->startpos[no].col;
7236 if (round == 2)
7237 vim_strncpy(retval, s, len);
7238 ++len;
7239 }
7240 else
7241 {
7242 /* Multiple lines: take start line from start col, middle
7243 * lines completely and end line up to end col. */
7244 len = (int)STRLEN(s);
7245 if (round == 2)
7246 {
7247 STRCPY(retval, s);
7248 retval[len] = '\n';
7249 }
7250 ++len;
7251 ++lnum;
7252 while (lnum < submatch_mmatch->endpos[no].lnum)
7253 {
7254 s = reg_getline(lnum++);
7255 if (round == 2)
7256 STRCPY(retval + len, s);
7257 len += (int)STRLEN(s);
7258 if (round == 2)
7259 retval[len] = '\n';
7260 ++len;
7261 }
7262 if (round == 2)
7263 STRNCPY(retval + len, reg_getline(lnum),
7264 submatch_mmatch->endpos[no].col);
7265 len += submatch_mmatch->endpos[no].col;
7266 if (round == 2)
7267 retval[len] = NUL;
7268 ++len;
7269 }
7270
7271 if (retval == NULL)
7272 {
7273 retval = lalloc((long_u)len, TRUE);
7274 if (retval == NULL)
7275 return NULL;
7276 }
7277 }
7278 }
7279 else
7280 {
7281 s = submatch_match->startp[no];
7282 if (s == NULL || submatch_match->endp[no] == NULL)
7283 retval = NULL;
7284 else
7285 retval = vim_strnsave(s, (int)(submatch_match->endp[no] - s));
7286 }
7287
7288 return retval;
7289 }
7290 #endif
Vim for the Mac