Mercurial > vim
annotate src/regexp_nfa.c @ 4527:55bcaa1d2749 v7.3.1011
updated for version 7.3.1011
Problem: New regexp engine is inefficient with multi-byte characters.
Solution: Handle a character at a time instead of a byte at a time. Also
make \Z partly work.
| author | Bram Moolenaar <bram@vim.org> |
|---|---|
| date | Fri, 24 May 2013 21:59:54 +0200 |
| parents | 36ddcf4cecbc |
| children | 432a6b8c7d93 |
| rev | line source |
|---|---|
| 4444 | 1 /* vi:set ts=8 sts=4 sw=4: |
| 2 * | |
| 3 * NFA regular expression implementation. | |
| 4 * | |
| 5 * This file is included in "regexp.c". | |
| 6 */ | |
| 7 | |
| 8 #ifdef DEBUG | |
| 9 /* Comment this out to disable log files. They can get pretty big */ | |
| 10 # define ENABLE_LOG | |
| 11 # define LOG_NAME "log_nfarun.log" | |
| 4460 | 12 # define NFA_REGEXP_DEBUG_LOG |
| 13 # define NFA_REGEXP_DEBUG_LOG_NAME "nfa_regexp_debug.log" | |
| 4444 | 14 #endif |
| 15 | |
| 16 /* Upper limit allowed for {m,n} repetitions handled by NFA */ | |
| 17 #define NFA_BRACES_MAXLIMIT 10 | |
| 18 /* For allocating space for the postfix representation */ | |
| 19 #define NFA_POSTFIX_MULTIPLIER (NFA_BRACES_MAXLIMIT + 2)*2 | |
| 20 | |
| 21 enum | |
| 22 { | |
| 23 NFA_SPLIT = -1024, | |
| 24 NFA_MATCH, | |
| 25 NFA_SKIP_CHAR, /* matches a 0-length char */ | |
| 26 NFA_END_NEG_RANGE, /* Used when expanding [^ab] */ | |
| 27 | |
| 28 NFA_CONCAT, | |
| 29 NFA_OR, | |
| 30 NFA_STAR, | |
| 31 NFA_PLUS, | |
| 32 NFA_QUEST, | |
| 33 NFA_QUEST_NONGREEDY, /* Non-greedy version of \? */ | |
| 34 NFA_NOT, /* used for [^ab] negated char ranges */ | |
| 35 | |
| 36 NFA_BOL, /* ^ Begin line */ | |
| 37 NFA_EOL, /* $ End line */ | |
| 38 NFA_BOW, /* \< Begin word */ | |
| 39 NFA_EOW, /* \> End word */ | |
| 40 NFA_BOF, /* \%^ Begin file */ | |
| 41 NFA_EOF, /* \%$ End file */ | |
| 42 NFA_NEWL, | |
| 43 NFA_ZSTART, /* Used for \zs */ | |
| 44 NFA_ZEND, /* Used for \ze */ | |
| 45 NFA_NOPEN, /* Start of subexpression marked with \%( */ | |
| 46 NFA_NCLOSE, /* End of subexpr. marked with \%( ... \) */ | |
| 47 NFA_START_INVISIBLE, | |
| 48 NFA_END_INVISIBLE, | |
| 49 NFA_COMPOSING, /* Next nodes in NFA are part of the | |
| 50 composing multibyte char */ | |
| 51 NFA_END_COMPOSING, /* End of a composing char in the NFA */ | |
| 52 | |
| 53 /* The following are used only in the postfix form, not in the NFA */ | |
| 54 NFA_PREV_ATOM_NO_WIDTH, /* Used for \@= */ | |
| 55 NFA_PREV_ATOM_NO_WIDTH_NEG, /* Used for \@! */ | |
| 56 NFA_PREV_ATOM_JUST_BEFORE, /* Used for \@<= */ | |
| 57 NFA_PREV_ATOM_JUST_BEFORE_NEG, /* Used for \@<! */ | |
| 58 NFA_PREV_ATOM_LIKE_PATTERN, /* Used for \@> */ | |
| 59 | |
| 60 NFA_MOPEN, | |
| 61 NFA_MCLOSE = NFA_MOPEN + NSUBEXP, | |
| 62 | |
| 63 /* NFA_FIRST_NL */ | |
| 64 NFA_ANY = NFA_MCLOSE + NSUBEXP, /* Match any one character. */ | |
| 65 NFA_ANYOF, /* Match any character in this string. */ | |
| 66 NFA_ANYBUT, /* Match any character not in this string. */ | |
| 67 NFA_IDENT, /* Match identifier char */ | |
| 68 NFA_SIDENT, /* Match identifier char but no digit */ | |
| 69 NFA_KWORD, /* Match keyword char */ | |
| 70 NFA_SKWORD, /* Match word char but no digit */ | |
| 71 NFA_FNAME, /* Match file name char */ | |
| 72 NFA_SFNAME, /* Match file name char but no digit */ | |
| 73 NFA_PRINT, /* Match printable char */ | |
| 74 NFA_SPRINT, /* Match printable char but no digit */ | |
| 75 NFA_WHITE, /* Match whitespace char */ | |
| 76 NFA_NWHITE, /* Match non-whitespace char */ | |
| 77 NFA_DIGIT, /* Match digit char */ | |
| 78 NFA_NDIGIT, /* Match non-digit char */ | |
| 79 NFA_HEX, /* Match hex char */ | |
| 80 NFA_NHEX, /* Match non-hex char */ | |
| 81 NFA_OCTAL, /* Match octal char */ | |
| 82 NFA_NOCTAL, /* Match non-octal char */ | |
| 83 NFA_WORD, /* Match word char */ | |
| 84 NFA_NWORD, /* Match non-word char */ | |
| 85 NFA_HEAD, /* Match head char */ | |
| 86 NFA_NHEAD, /* Match non-head char */ | |
| 87 NFA_ALPHA, /* Match alpha char */ | |
| 88 NFA_NALPHA, /* Match non-alpha char */ | |
| 89 NFA_LOWER, /* Match lowercase char */ | |
| 90 NFA_NLOWER, /* Match non-lowercase char */ | |
| 91 NFA_UPPER, /* Match uppercase char */ | |
| 92 NFA_NUPPER, /* Match non-uppercase char */ | |
| 93 NFA_FIRST_NL = NFA_ANY + ADD_NL, | |
| 94 NFA_LAST_NL = NFA_NUPPER + ADD_NL, | |
| 95 | |
| 96 /* Character classes [:alnum:] etc */ | |
| 97 NFA_CLASS_ALNUM, | |
| 98 NFA_CLASS_ALPHA, | |
| 99 NFA_CLASS_BLANK, | |
| 100 NFA_CLASS_CNTRL, | |
| 101 NFA_CLASS_DIGIT, | |
| 102 NFA_CLASS_GRAPH, | |
| 103 NFA_CLASS_LOWER, | |
| 104 NFA_CLASS_PRINT, | |
| 105 NFA_CLASS_PUNCT, | |
| 106 NFA_CLASS_SPACE, | |
| 107 NFA_CLASS_UPPER, | |
| 108 NFA_CLASS_XDIGIT, | |
| 109 NFA_CLASS_TAB, | |
| 110 NFA_CLASS_RETURN, | |
| 111 NFA_CLASS_BACKSPACE, | |
| 112 NFA_CLASS_ESCAPE | |
| 113 }; | |
| 114 | |
| 115 /* Keep in sync with classchars. */ | |
| 116 static int nfa_classcodes[] = { | |
| 117 NFA_ANY, NFA_IDENT, NFA_SIDENT, NFA_KWORD,NFA_SKWORD, | |
| 118 NFA_FNAME, NFA_SFNAME, NFA_PRINT, NFA_SPRINT, | |
| 119 NFA_WHITE, NFA_NWHITE, NFA_DIGIT, NFA_NDIGIT, | |
| 120 NFA_HEX, NFA_NHEX, NFA_OCTAL, NFA_NOCTAL, | |
| 121 NFA_WORD, NFA_NWORD, NFA_HEAD, NFA_NHEAD, | |
| 122 NFA_ALPHA, NFA_NALPHA, NFA_LOWER, NFA_NLOWER, | |
| 123 NFA_UPPER, NFA_NUPPER | |
| 124 }; | |
| 125 | |
| 126 static char_u e_misplaced[] = N_("E866: (NFA regexp) Misplaced %c"); | |
| 127 | |
| 128 /* | |
| 129 * NFA errors can be of 3 types: | |
| 130 * *** NFA runtime errors, when something unknown goes wrong. The NFA fails | |
| 131 * silently and revert the to backtracking engine. | |
| 132 * syntax_error = FALSE; | |
| 133 * *** Regexp syntax errors, when the input regexp is not syntactically correct. | |
| 134 * The NFA engine displays an error message, and nothing else happens. | |
| 135 * syntax_error = TRUE | |
| 136 * *** Unsupported features, when the input regexp uses an operator that is not | |
| 137 * implemented in the NFA. The NFA engine fails silently, and reverts to the | |
| 138 * old backtracking engine. | |
| 139 * syntax_error = FALSE | |
| 140 * "The NFA fails" means that "compiling the regexp with the NFA fails": | |
| 141 * nfa_regcomp() returns FAIL. | |
| 142 */ | |
| 143 static int syntax_error = FALSE; | |
| 144 | |
| 145 /* NFA regexp \ze operator encountered. */ | |
| 146 static int nfa_has_zend = FALSE; | |
| 147 | |
| 148 static int *post_start; /* holds the postfix form of r.e. */ | |
| 149 static int *post_end; | |
| 150 static int *post_ptr; | |
| 151 | |
| 152 static int nstate; /* Number of states in the NFA. */ | |
| 153 static int istate; /* Index in the state vector, used in new_state() */ | |
| 154 static int nstate_max; /* Upper bound of estimated number of states. */ | |
| 155 | |
| 156 | |
| 157 static int nfa_regcomp_start __ARGS((char_u*expr, int re_flags)); | |
| 158 static int nfa_recognize_char_class __ARGS((char_u *start, char_u *end, int extra_newl)); | |
| 159 static int nfa_emit_equi_class __ARGS((int c, int neg)); | |
| 160 static void nfa_inc __ARGS((char_u **p)); | |
| 161 static void nfa_dec __ARGS((char_u **p)); | |
| 162 static int nfa_regatom __ARGS((void)); | |
| 163 static int nfa_regpiece __ARGS((void)); | |
| 164 static int nfa_regconcat __ARGS((void)); | |
| 165 static int nfa_regbranch __ARGS((void)); | |
| 166 static int nfa_reg __ARGS((int paren)); | |
| 167 #ifdef DEBUG | |
| 168 static void nfa_set_code __ARGS((int c)); | |
| 169 static void nfa_postfix_dump __ARGS((char_u *expr, int retval)); | |
| 170 static void nfa_print_state __ARGS((FILE *debugf, nfa_state_T *state, int ident)); | |
| 171 static void nfa_dump __ARGS((nfa_regprog_T *prog)); | |
| 172 #endif | |
| 173 static int *re2post __ARGS((void)); | |
| 174 static nfa_state_T *new_state __ARGS((int c, nfa_state_T *out, nfa_state_T *out1)); | |
| 175 static nfa_state_T *post2nfa __ARGS((int *postfix, int *end, int nfa_calc_size)); | |
| 176 static int check_char_class __ARGS((int class, int c)); | |
| 177 static void st_error __ARGS((int *postfix, int *end, int *p)); | |
| 178 static void nfa_save_listids __ARGS((nfa_state_T *start, int *list)); | |
| 179 static void nfa_restore_listids __ARGS((nfa_state_T *start, int *list)); | |
| 180 static void nfa_set_null_listids __ARGS((nfa_state_T *start)); | |
| 181 static void nfa_set_neg_listids __ARGS((nfa_state_T *start)); | |
| 182 static long nfa_regtry __ARGS((nfa_state_T *start, colnr_T col)); | |
| 183 static long nfa_regexec_both __ARGS((char_u *line, colnr_T col)); | |
| 184 static regprog_T *nfa_regcomp __ARGS((char_u *expr, int re_flags)); | |
| 185 static int nfa_regexec __ARGS((regmatch_T *rmp, char_u *line, colnr_T col)); | |
| 186 static long nfa_regexec_multi __ARGS((regmmatch_T *rmp, win_T *win, buf_T *buf, linenr_T lnum, colnr_T col, proftime_T *tm)); | |
| 187 | |
| 188 /* helper functions used when doing re2post() ... regatom() parsing */ | |
| 189 #define EMIT(c) do { \ | |
| 190 if (post_ptr >= post_end) \ | |
| 191 return FAIL; \ | |
| 192 *post_ptr++ = c; \ | |
| 193 } while (0) | |
| 194 | |
| 195 /* | |
| 196 * Initialize internal variables before NFA compilation. | |
| 197 * Return OK on success, FAIL otherwise. | |
| 198 */ | |
| 199 static int | |
| 200 nfa_regcomp_start(expr, re_flags) | |
| 201 char_u *expr; | |
| 202 int re_flags; /* see vim_regcomp() */ | |
| 203 { | |
| 4458 | 204 size_t postfix_size; |
| 4444 | 205 |
| 206 nstate = 0; | |
| 207 istate = 0; | |
| 208 /* A reasonable estimation for size */ | |
| 4458 | 209 nstate_max = (int)(STRLEN(expr) + 1) * NFA_POSTFIX_MULTIPLIER; |
| 4444 | 210 |
| 4454 | 211 /* Some items blow up in size, such as [A-z]. Add more space for that. |
| 212 * TODO: some patterns may still fail. */ | |
| 4458 | 213 nstate_max += 1000; |
| 4454 | 214 |
| 215 /* Size for postfix representation of expr. */ | |
| 4444 | 216 postfix_size = sizeof(*post_start) * nstate_max; |
| 4454 | 217 |
| 4444 | 218 post_start = (int *)lalloc(postfix_size, TRUE); |
| 219 if (post_start == NULL) | |
| 220 return FAIL; | |
| 221 vim_memset(post_start, 0, postfix_size); | |
| 222 post_ptr = post_start; | |
| 4454 | 223 post_end = post_start + nstate_max; |
| 4444 | 224 nfa_has_zend = FALSE; |
| 225 | |
| 226 regcomp_start(expr, re_flags); | |
| 227 | |
| 228 return OK; | |
| 229 } | |
| 230 | |
| 231 /* | |
| 232 * Search between "start" and "end" and try to recognize a | |
| 233 * character class in expanded form. For example [0-9]. | |
| 234 * On success, return the id the character class to be emitted. | |
| 235 * On failure, return 0 (=FAIL) | |
| 236 * Start points to the first char of the range, while end should point | |
| 237 * to the closing brace. | |
| 238 */ | |
| 239 static int | |
| 240 nfa_recognize_char_class(start, end, extra_newl) | |
| 241 char_u *start; | |
| 242 char_u *end; | |
| 243 int extra_newl; | |
| 244 { | |
| 245 int i; | |
| 246 /* Each of these variables takes up a char in "config[]", | |
| 247 * in the order they are here. */ | |
| 248 int not = FALSE, af = FALSE, AF = FALSE, az = FALSE, AZ = FALSE, | |
| 249 o7 = FALSE, o9 = FALSE, underscore = FALSE, newl = FALSE; | |
| 250 char_u *p; | |
| 251 #define NCONFIGS 16 | |
| 252 int classid[NCONFIGS] = { | |
| 253 NFA_DIGIT, NFA_NDIGIT, NFA_HEX, NFA_NHEX, | |
| 254 NFA_OCTAL, NFA_NOCTAL, NFA_WORD, NFA_NWORD, | |
| 255 NFA_HEAD, NFA_NHEAD, NFA_ALPHA, NFA_NALPHA, | |
| 256 NFA_LOWER, NFA_NLOWER, NFA_UPPER, NFA_NUPPER | |
| 257 }; | |
| 4450 | 258 char_u myconfig[10]; |
| 4444 | 259 char_u config[NCONFIGS][9] = { |
| 260 "000000100", /* digit */ | |
| 261 "100000100", /* non digit */ | |
| 262 "011000100", /* hex-digit */ | |
| 263 "111000100", /* non hex-digit */ | |
| 264 "000001000", /* octal-digit */ | |
| 265 "100001000", /* [^0-7] */ | |
| 266 "000110110", /* [0-9A-Za-z_] */ | |
| 267 "100110110", /* [^0-9A-Za-z_] */ | |
| 268 "000110010", /* head of word */ | |
| 269 "100110010", /* not head of word */ | |
| 270 "000110000", /* alphabetic char a-z */ | |
| 271 "100110000", /* non alphabetic char */ | |
| 272 "000100000", /* lowercase letter */ | |
| 273 "100100000", /* non lowercase */ | |
| 274 "000010000", /* uppercase */ | |
| 275 "100010000" /* non uppercase */ | |
| 276 }; | |
| 277 | |
| 278 if (extra_newl == TRUE) | |
| 279 newl = TRUE; | |
| 280 | |
| 281 if (*end != ']') | |
| 282 return FAIL; | |
| 283 p = start; | |
| 284 if (*p == '^') | |
| 285 { | |
| 286 not = TRUE; | |
| 287 p ++; | |
| 288 } | |
| 289 | |
| 290 while (p < end) | |
| 291 { | |
| 292 if (p + 2 < end && *(p + 1) == '-') | |
| 293 { | |
| 294 switch (*p) | |
| 295 { | |
| 296 case '0': | |
| 297 if (*(p + 2) == '9') | |
| 298 { | |
| 299 o9 = TRUE; | |
| 300 break; | |
| 301 } | |
| 302 else | |
| 303 if (*(p + 2) == '7') | |
| 304 { | |
| 305 o7 = TRUE; | |
| 306 break; | |
| 307 } | |
| 308 case 'a': | |
| 309 if (*(p + 2) == 'z') | |
| 310 { | |
| 311 az = TRUE; | |
| 312 break; | |
| 313 } | |
| 314 else | |
| 315 if (*(p + 2) == 'f') | |
| 316 { | |
| 317 af = TRUE; | |
| 318 break; | |
| 319 } | |
| 320 case 'A': | |
| 321 if (*(p + 2) == 'Z') | |
| 322 { | |
| 323 AZ = TRUE; | |
| 324 break; | |
| 325 } | |
| 326 else | |
| 327 if (*(p + 2) == 'F') | |
| 328 { | |
| 329 AF = TRUE; | |
| 330 break; | |
| 331 } | |
| 332 /* FALLTHROUGH */ | |
| 333 default: | |
| 334 return FAIL; | |
| 335 } | |
| 336 p += 3; | |
| 337 } | |
| 338 else if (p + 1 < end && *p == '\\' && *(p + 1) == 'n') | |
| 339 { | |
| 340 newl = TRUE; | |
| 341 p += 2; | |
| 342 } | |
| 343 else if (*p == '_') | |
| 344 { | |
| 345 underscore = TRUE; | |
| 346 p ++; | |
| 347 } | |
| 348 else if (*p == '\n') | |
| 349 { | |
| 350 newl = TRUE; | |
| 351 p ++; | |
| 352 } | |
| 353 else | |
| 354 return FAIL; | |
| 355 } /* while (p < end) */ | |
| 356 | |
| 357 if (p != end) | |
| 358 return FAIL; | |
| 359 | |
| 360 /* build the config that represents the ranges we gathered */ | |
| 361 STRCPY(myconfig, "000000000"); | |
| 362 if (not == TRUE) | |
| 363 myconfig[0] = '1'; | |
| 364 if (af == TRUE) | |
| 365 myconfig[1] = '1'; | |
| 366 if (AF == TRUE) | |
| 367 myconfig[2] = '1'; | |
| 368 if (az == TRUE) | |
| 369 myconfig[3] = '1'; | |
| 370 if (AZ == TRUE) | |
| 371 myconfig[4] = '1'; | |
| 372 if (o7 == TRUE) | |
| 373 myconfig[5] = '1'; | |
| 374 if (o9 == TRUE) | |
| 375 myconfig[6] = '1'; | |
| 376 if (underscore == TRUE) | |
| 377 myconfig[7] = '1'; | |
| 378 if (newl == TRUE) | |
| 379 { | |
| 380 myconfig[8] = '1'; | |
| 381 extra_newl = ADD_NL; | |
| 382 } | |
| 383 /* try to recognize character classes */ | |
| 384 for (i = 0; i < NCONFIGS; i++) | |
| 4450 | 385 if (STRNCMP(myconfig, config[i], 8) == 0) |
| 4444 | 386 return classid[i] + extra_newl; |
| 387 | |
| 388 /* fallthrough => no success so far */ | |
| 389 return FAIL; | |
| 390 | |
| 391 #undef NCONFIGS | |
| 392 } | |
| 393 | |
| 394 /* | |
| 395 * Produce the bytes for equivalence class "c". | |
| 396 * Currently only handles latin1, latin9 and utf-8. | |
| 397 * Emits bytes in postfix notation: 'a,b,NFA_OR,c,NFA_OR' is | |
| 398 * equivalent to 'a OR b OR c' | |
| 399 * | |
| 400 * NOTE! When changing this function, also update reg_equi_class() | |
| 401 */ | |
| 402 static int | |
| 403 nfa_emit_equi_class(c, neg) | |
| 404 int c; | |
| 405 int neg; | |
| 406 { | |
| 407 int first = TRUE; | |
| 408 int glue = neg == TRUE ? NFA_CONCAT : NFA_OR; | |
| 409 #define EMIT2(c) \ | |
| 410 EMIT(c); \ | |
| 411 if (neg == TRUE) { \ | |
| 412 EMIT(NFA_NOT); \ | |
| 413 } \ | |
| 414 if (first == FALSE) \ | |
| 415 EMIT(glue); \ | |
| 416 else \ | |
| 417 first = FALSE; \ | |
| 418 | |
| 419 #ifdef FEAT_MBYTE | |
| 420 if (enc_utf8 || STRCMP(p_enc, "latin1") == 0 | |
| 421 || STRCMP(p_enc, "iso-8859-15") == 0) | |
| 422 #endif | |
| 423 { | |
| 424 switch (c) | |
| 425 { | |
| 426 case 'A': case '\300': case '\301': case '\302': | |
| 427 case '\303': case '\304': case '\305': | |
| 428 EMIT2('A'); EMIT2('\300'); EMIT2('\301'); | |
| 429 EMIT2('\302'); EMIT2('\303'); EMIT2('\304'); | |
| 430 EMIT2('\305'); | |
| 431 return OK; | |
| 432 | |
| 433 case 'C': case '\307': | |
| 434 EMIT2('C'); EMIT2('\307'); | |
| 435 return OK; | |
| 436 | |
| 437 case 'E': case '\310': case '\311': case '\312': case '\313': | |
| 438 EMIT2('E'); EMIT2('\310'); EMIT2('\311'); | |
| 439 EMIT2('\312'); EMIT2('\313'); | |
| 440 return OK; | |
| 441 | |
| 442 case 'I': case '\314': case '\315': case '\316': case '\317': | |
| 443 EMIT2('I'); EMIT2('\314'); EMIT2('\315'); | |
| 444 EMIT2('\316'); EMIT2('\317'); | |
| 445 return OK; | |
| 446 | |
| 447 case 'N': case '\321': | |
| 448 EMIT2('N'); EMIT2('\321'); | |
| 449 return OK; | |
| 450 | |
| 451 case 'O': case '\322': case '\323': case '\324': case '\325': | |
| 452 case '\326': | |
| 453 EMIT2('O'); EMIT2('\322'); EMIT2('\323'); | |
| 454 EMIT2('\324'); EMIT2('\325'); EMIT2('\326'); | |
| 455 return OK; | |
| 456 | |
| 457 case 'U': case '\331': case '\332': case '\333': case '\334': | |
| 458 EMIT2('U'); EMIT2('\331'); EMIT2('\332'); | |
| 459 EMIT2('\333'); EMIT2('\334'); | |
| 460 return OK; | |
| 461 | |
| 462 case 'Y': case '\335': | |
| 463 EMIT2('Y'); EMIT2('\335'); | |
| 464 return OK; | |
| 465 | |
| 466 case 'a': case '\340': case '\341': case '\342': | |
| 467 case '\343': case '\344': case '\345': | |
| 468 EMIT2('a'); EMIT2('\340'); EMIT2('\341'); | |
| 469 EMIT2('\342'); EMIT2('\343'); EMIT2('\344'); | |
| 470 EMIT2('\345'); | |
| 471 return OK; | |
| 472 | |
| 473 case 'c': case '\347': | |
| 474 EMIT2('c'); EMIT2('\347'); | |
| 475 return OK; | |
| 476 | |
| 477 case 'e': case '\350': case '\351': case '\352': case '\353': | |
| 478 EMIT2('e'); EMIT2('\350'); EMIT2('\351'); | |
| 479 EMIT2('\352'); EMIT2('\353'); | |
| 480 return OK; | |
| 481 | |
| 482 case 'i': case '\354': case '\355': case '\356': case '\357': | |
| 483 EMIT2('i'); EMIT2('\354'); EMIT2('\355'); | |
| 484 EMIT2('\356'); EMIT2('\357'); | |
| 485 return OK; | |
| 486 | |
| 487 case 'n': case '\361': | |
| 488 EMIT2('n'); EMIT2('\361'); | |
| 489 return OK; | |
| 490 | |
| 491 case 'o': case '\362': case '\363': case '\364': case '\365': | |
| 492 case '\366': | |
| 493 EMIT2('o'); EMIT2('\362'); EMIT2('\363'); | |
| 494 EMIT2('\364'); EMIT2('\365'); EMIT2('\366'); | |
| 495 return OK; | |
| 496 | |
| 497 case 'u': case '\371': case '\372': case '\373': case '\374': | |
| 498 EMIT2('u'); EMIT2('\371'); EMIT2('\372'); | |
| 499 EMIT2('\373'); EMIT2('\374'); | |
| 500 return OK; | |
| 501 | |
| 502 case 'y': case '\375': case '\377': | |
| 503 EMIT2('y'); EMIT2('\375'); EMIT2('\377'); | |
| 504 return OK; | |
| 505 | |
| 506 default: | |
| 507 return FAIL; | |
| 508 } | |
| 509 } | |
| 510 | |
| 511 EMIT(c); | |
| 512 return OK; | |
| 513 #undef EMIT2 | |
| 514 } | |
| 515 | |
| 516 /* | |
| 517 * Code to parse regular expression. | |
| 518 * | |
| 519 * We try to reuse parsing functions in regexp.c to | |
| 520 * minimize surprise and keep the syntax consistent. | |
| 521 */ | |
| 522 | |
| 523 /* | |
| 524 * Increments the pointer "p" by one (multi-byte) character. | |
| 525 */ | |
| 526 static void | |
| 527 nfa_inc(p) | |
| 528 char_u **p; | |
| 529 { | |
| 530 #ifdef FEAT_MBYTE | |
| 531 if (has_mbyte) | |
| 532 mb_ptr2char_adv(p); | |
| 533 else | |
| 534 #endif | |
| 535 *p = *p + 1; | |
| 536 } | |
| 537 | |
| 538 /* | |
| 539 * Decrements the pointer "p" by one (multi-byte) character. | |
| 540 */ | |
| 541 static void | |
| 542 nfa_dec(p) | |
| 543 char_u **p; | |
| 544 { | |
| 545 #ifdef FEAT_MBYTE | |
| 546 char_u *p2, *oldp; | |
| 547 | |
| 548 if (has_mbyte) | |
| 549 { | |
| 550 oldp = *p; | |
| 551 /* Try to find the multibyte char that advances to the current | |
| 552 * position. */ | |
| 553 do | |
| 554 { | |
| 555 *p = *p - 1; | |
| 556 p2 = *p; | |
| 557 mb_ptr2char_adv(&p2); | |
| 558 } while (p2 != oldp); | |
| 559 } | |
| 560 #else | |
| 561 *p = *p - 1; | |
| 562 #endif | |
| 563 } | |
| 564 | |
| 565 /* | |
| 566 * Parse the lowest level. | |
| 567 * | |
| 568 * An atom can be one of a long list of items. Many atoms match one character | |
| 569 * in the text. It is often an ordinary character or a character class. | |
| 570 * Braces can be used to make a pattern into an atom. The "\z(\)" construct | |
| 571 * is only for syntax highlighting. | |
| 572 * | |
| 573 * atom ::= ordinary-atom | |
| 574 * or \( pattern \) | |
| 575 * or \%( pattern \) | |
| 576 * or \z( pattern \) | |
| 577 */ | |
| 578 static int | |
| 579 nfa_regatom() | |
| 580 { | |
| 581 int c; | |
| 582 int charclass; | |
| 583 int equiclass; | |
| 584 int collclass; | |
| 585 int got_coll_char; | |
| 586 char_u *p; | |
| 587 char_u *endp; | |
| 588 #ifdef FEAT_MBYTE | |
| 589 char_u *old_regparse = regparse; | |
| 590 int clen; | |
| 591 int i; | |
| 592 #endif | |
| 593 int extra = 0; | |
| 594 int first; | |
| 595 int emit_range; | |
| 596 int negated; | |
| 597 int result; | |
| 598 int startc = -1; | |
| 599 int endc = -1; | |
| 600 int oldstartc = -1; | |
| 601 int cpo_lit; /* 'cpoptions' contains 'l' flag */ | |
| 602 int cpo_bsl; /* 'cpoptions' contains '\' flag */ | |
| 603 int glue; /* ID that will "glue" nodes together */ | |
| 604 | |
| 605 cpo_lit = vim_strchr(p_cpo, CPO_LITERAL) != NULL; | |
| 606 cpo_bsl = vim_strchr(p_cpo, CPO_BACKSL) != NULL; | |
| 607 | |
| 608 c = getchr(); | |
| 609 | |
| 610 #ifdef FEAT_MBYTE | |
| 611 /* clen has the length of the current char, without composing chars */ | |
| 612 clen = (*mb_char2len)(c); | |
| 613 if (has_mbyte && clen > 1) | |
| 614 goto nfa_do_multibyte; | |
| 615 #endif | |
| 616 switch (c) | |
| 617 { | |
| 618 case Magic('^'): | |
| 619 EMIT(NFA_BOL); | |
| 620 break; | |
| 621 | |
| 622 case Magic('$'): | |
| 623 EMIT(NFA_EOL); | |
| 624 #if defined(FEAT_SYN_HL) || defined(PROTO) | |
| 625 had_eol = TRUE; | |
| 626 #endif | |
| 627 break; | |
| 628 | |
| 629 case Magic('<'): | |
| 630 EMIT(NFA_BOW); | |
| 631 break; | |
| 632 | |
| 633 case Magic('>'): | |
| 634 EMIT(NFA_EOW); | |
| 635 break; | |
| 636 | |
| 637 case Magic('_'): | |
| 638 c = no_Magic(getchr()); | |
| 639 if (c == '^') /* "\_^" is start-of-line */ | |
| 640 { | |
| 641 EMIT(NFA_BOL); | |
| 642 break; | |
| 643 } | |
| 644 if (c == '$') /* "\_$" is end-of-line */ | |
| 645 { | |
| 646 EMIT(NFA_EOL); | |
| 647 #if defined(FEAT_SYN_HL) || defined(PROTO) | |
| 648 had_eol = TRUE; | |
| 649 #endif | |
| 650 break; | |
| 651 } | |
| 652 | |
| 653 extra = ADD_NL; | |
| 654 | |
| 655 /* "\_[" is collection plus newline */ | |
| 656 if (c == '[') | |
|
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657 goto collection; |
| 4444 | 658 |
| 659 /* "\_x" is character class plus newline */ | |
| 660 /*FALLTHROUGH*/ | |
| 661 | |
| 662 /* | |
| 663 * Character classes. | |
| 664 */ | |
| 665 case Magic('.'): | |
| 666 case Magic('i'): | |
| 667 case Magic('I'): | |
| 668 case Magic('k'): | |
| 669 case Magic('K'): | |
| 670 case Magic('f'): | |
| 671 case Magic('F'): | |
| 672 case Magic('p'): | |
| 673 case Magic('P'): | |
| 674 case Magic('s'): | |
| 675 case Magic('S'): | |
| 676 case Magic('d'): | |
| 677 case Magic('D'): | |
| 678 case Magic('x'): | |
| 679 case Magic('X'): | |
| 680 case Magic('o'): | |
| 681 case Magic('O'): | |
| 682 case Magic('w'): | |
| 683 case Magic('W'): | |
| 684 case Magic('h'): | |
| 685 case Magic('H'): | |
| 686 case Magic('a'): | |
| 687 case Magic('A'): | |
| 688 case Magic('l'): | |
| 689 case Magic('L'): | |
| 690 case Magic('u'): | |
| 691 case Magic('U'): | |
| 692 p = vim_strchr(classchars, no_Magic(c)); | |
| 693 if (p == NULL) | |
| 694 { | |
| 695 return FAIL; /* runtime error */ | |
| 696 } | |
| 697 #ifdef FEAT_MBYTE | |
| 698 /* When '.' is followed by a composing char ignore the dot, so that | |
| 699 * the composing char is matched here. */ | |
| 700 if (enc_utf8 && c == Magic('.') && utf_iscomposing(peekchr())) | |
| 701 { | |
| 702 c = getchr(); | |
| 703 goto nfa_do_multibyte; | |
| 704 } | |
| 705 #endif | |
| 706 EMIT(nfa_classcodes[p - classchars]); | |
| 707 if (extra == ADD_NL) | |
| 708 { | |
| 709 EMIT(NFA_NEWL); | |
| 710 EMIT(NFA_OR); | |
| 711 regflags |= RF_HASNL; | |
| 712 } | |
| 713 break; | |
| 714 | |
| 715 case Magic('n'): | |
| 716 if (reg_string) | |
| 717 /* In a string "\n" matches a newline character. */ | |
| 718 EMIT(NL); | |
| 719 else | |
| 720 { | |
| 721 /* In buffer text "\n" matches the end of a line. */ | |
| 722 EMIT(NFA_NEWL); | |
| 723 regflags |= RF_HASNL; | |
| 724 } | |
| 725 break; | |
| 726 | |
| 727 case Magic('('): | |
| 728 if (nfa_reg(REG_PAREN) == FAIL) | |
| 729 return FAIL; /* cascaded error */ | |
| 730 break; | |
| 731 | |
| 732 case NUL: | |
| 733 syntax_error = TRUE; | |
| 734 EMSG_RET_FAIL(_("E865: (NFA) Regexp end encountered prematurely")); | |
| 735 | |
| 736 case Magic('|'): | |
| 737 case Magic('&'): | |
| 738 case Magic(')'): | |
| 739 syntax_error = TRUE; | |
| 4450 | 740 EMSGN(_(e_misplaced), no_Magic(c)); |
| 4444 | 741 return FAIL; |
| 742 | |
| 743 case Magic('='): | |
| 744 case Magic('?'): | |
| 745 case Magic('+'): | |
| 746 case Magic('@'): | |
| 747 case Magic('*'): | |
| 748 case Magic('{'): | |
| 749 /* these should follow an atom, not form an atom */ | |
| 750 syntax_error = TRUE; | |
| 4450 | 751 EMSGN(_(e_misplaced), no_Magic(c)); |
| 4444 | 752 return FAIL; |
| 753 | |
| 754 case Magic('~'): /* previous substitute pattern */ | |
| 755 /* Not supported yet */ | |
| 756 return FAIL; | |
| 757 | |
| 758 case Magic('1'): | |
| 759 case Magic('2'): | |
| 760 case Magic('3'): | |
| 761 case Magic('4'): | |
| 762 case Magic('5'): | |
| 763 case Magic('6'): | |
| 764 case Magic('7'): | |
| 765 case Magic('8'): | |
| 766 case Magic('9'): | |
| 767 /* not supported yet */ | |
| 768 return FAIL; | |
| 769 | |
| 770 case Magic('z'): | |
| 771 c = no_Magic(getchr()); | |
| 772 switch (c) | |
| 773 { | |
| 774 case 's': | |
| 775 EMIT(NFA_ZSTART); | |
| 776 break; | |
| 777 case 'e': | |
| 778 EMIT(NFA_ZEND); | |
| 779 nfa_has_zend = TRUE; | |
| 780 /* TODO: Currently \ze does not work properly. */ | |
| 781 return FAIL; | |
| 782 /* break; */ | |
| 783 case '1': | |
| 784 case '2': | |
| 785 case '3': | |
| 786 case '4': | |
| 787 case '5': | |
| 788 case '6': | |
| 789 case '7': | |
| 790 case '8': | |
| 791 case '9': | |
| 792 case '(': | |
| 793 /* \z1...\z9 and \z( not yet supported */ | |
| 794 return FAIL; | |
| 795 default: | |
| 796 syntax_error = TRUE; | |
| 4450 | 797 EMSGN(_("E867: (NFA) Unknown operator '\\z%c'"), |
| 4444 | 798 no_Magic(c)); |
| 799 return FAIL; | |
| 800 } | |
| 801 break; | |
| 802 | |
| 803 case Magic('%'): | |
| 804 c = no_Magic(getchr()); | |
| 805 switch (c) | |
| 806 { | |
| 807 /* () without a back reference */ | |
| 808 case '(': | |
| 809 if (nfa_reg(REG_NPAREN) == FAIL) | |
| 810 return FAIL; | |
| 811 EMIT(NFA_NOPEN); | |
| 812 break; | |
| 813 | |
| 814 case 'd': /* %d123 decimal */ | |
| 815 case 'o': /* %o123 octal */ | |
| 816 case 'x': /* %xab hex 2 */ | |
| 817 case 'u': /* %uabcd hex 4 */ | |
| 818 case 'U': /* %U1234abcd hex 8 */ | |
| 819 /* Not yet supported */ | |
| 820 return FAIL; | |
| 821 | |
| 822 c = coll_get_char(); | |
|
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823 EMIT(c); |
| 4444 | 824 break; |
| 825 | |
| 826 /* Catch \%^ and \%$ regardless of where they appear in the | |
| 827 * pattern -- regardless of whether or not it makes sense. */ | |
| 828 case '^': | |
| 829 EMIT(NFA_BOF); | |
| 830 /* Not yet supported */ | |
| 831 return FAIL; | |
| 832 break; | |
| 833 | |
| 834 case '$': | |
| 835 EMIT(NFA_EOF); | |
| 836 /* Not yet supported */ | |
| 837 return FAIL; | |
| 838 break; | |
| 839 | |
| 840 case '#': | |
| 841 /* not supported yet */ | |
| 842 return FAIL; | |
| 843 break; | |
| 844 | |
| 845 case 'V': | |
| 846 /* not supported yet */ | |
| 847 return FAIL; | |
| 848 break; | |
| 849 | |
| 850 case '[': | |
| 851 /* \%[abc] not supported yet */ | |
| 852 return FAIL; | |
| 853 | |
| 854 default: | |
| 855 /* not supported yet */ | |
| 856 return FAIL; | |
| 857 } | |
| 858 break; | |
| 859 | |
| 860 case Magic('['): | |
|
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861 collection: |
| 4444 | 862 /* |
| 863 * Glue is emitted between several atoms from the []. | |
| 864 * It is either NFA_OR, or NFA_CONCAT. | |
| 865 * | |
| 866 * [abc] expands to 'a b NFA_OR c NFA_OR' (in postfix notation) | |
| 867 * [^abc] expands to 'a NFA_NOT b NFA_NOT NFA_CONCAT c NFA_NOT | |
| 868 * NFA_CONCAT NFA_END_NEG_RANGE NFA_CONCAT' (in postfix | |
| 869 * notation) | |
| 870 * | |
| 871 */ | |
| 872 | |
| 873 | |
| 874 /* Emit negation atoms, if needed. | |
| 875 * The CONCAT below merges the NOT with the previous node. */ | |
| 876 #define TRY_NEG() \ | |
| 877 if (negated == TRUE) \ | |
| 878 { \ | |
| 879 EMIT(NFA_NOT); \ | |
| 880 } | |
| 881 | |
| 882 /* Emit glue between important nodes : CONCAT or OR. */ | |
| 883 #define EMIT_GLUE() \ | |
| 884 if (first == FALSE) \ | |
| 885 EMIT(glue); \ | |
| 886 else \ | |
| 887 first = FALSE; | |
| 888 | |
| 889 p = regparse; | |
| 890 endp = skip_anyof(p); | |
| 891 if (*endp == ']') | |
| 892 { | |
| 893 /* | |
| 894 * Try to reverse engineer character classes. For example, | |
| 895 * recognize that [0-9] stands for \d and [A-Za-z_] with \h, | |
| 896 * and perform the necessary substitutions in the NFA. | |
| 897 */ | |
| 898 result = nfa_recognize_char_class(regparse, endp, | |
| 899 extra == ADD_NL); | |
| 900 if (result != FAIL) | |
| 901 { | |
| 902 if (result >= NFA_DIGIT && result <= NFA_NUPPER) | |
| 903 EMIT(result); | |
| 904 else /* must be char class + newline */ | |
| 905 { | |
| 906 EMIT(result - ADD_NL); | |
| 907 EMIT(NFA_NEWL); | |
| 908 EMIT(NFA_OR); | |
| 909 } | |
| 910 regparse = endp; | |
| 911 nfa_inc(®parse); | |
| 912 return OK; | |
| 913 } | |
| 914 /* | |
| 915 * Failed to recognize a character class. Use the simple | |
| 916 * version that turns [abc] into 'a' OR 'b' OR 'c' | |
| 917 */ | |
| 918 startc = endc = oldstartc = -1; | |
| 919 first = TRUE; /* Emitting first atom in this sequence? */ | |
| 920 negated = FALSE; | |
| 921 glue = NFA_OR; | |
| 922 if (*regparse == '^') /* negated range */ | |
| 923 { | |
| 924 negated = TRUE; | |
| 925 glue = NFA_CONCAT; | |
| 926 nfa_inc(®parse); | |
| 927 } | |
| 928 if (*regparse == '-') | |
| 929 { | |
| 930 startc = '-'; | |
| 931 EMIT(startc); | |
| 932 TRY_NEG(); | |
| 933 EMIT_GLUE(); | |
| 934 nfa_inc(®parse); | |
| 935 } | |
| 936 /* Emit the OR branches for each character in the [] */ | |
| 937 emit_range = FALSE; | |
| 938 while (regparse < endp) | |
| 939 { | |
| 940 oldstartc = startc; | |
| 941 startc = -1; | |
| 942 got_coll_char = FALSE; | |
| 943 if (*regparse == '[') | |
| 944 { | |
| 945 /* Check for [: :], [= =], [. .] */ | |
| 946 equiclass = collclass = 0; | |
| 947 charclass = get_char_class(®parse); | |
| 948 if (charclass == CLASS_NONE) | |
| 949 { | |
| 950 equiclass = get_equi_class(®parse); | |
| 951 if (equiclass == 0) | |
| 952 collclass = get_coll_element(®parse); | |
| 953 } | |
| 954 | |
| 955 /* Character class like [:alpha:] */ | |
| 956 if (charclass != CLASS_NONE) | |
| 957 { | |
| 958 switch (charclass) | |
| 959 { | |
| 960 case CLASS_ALNUM: | |
| 961 EMIT(NFA_CLASS_ALNUM); | |
| 962 break; | |
| 963 case CLASS_ALPHA: | |
| 964 EMIT(NFA_CLASS_ALPHA); | |
| 965 break; | |
| 966 case CLASS_BLANK: | |
| 967 EMIT(NFA_CLASS_BLANK); | |
| 968 break; | |
| 969 case CLASS_CNTRL: | |
| 970 EMIT(NFA_CLASS_CNTRL); | |
| 971 break; | |
| 972 case CLASS_DIGIT: | |
| 973 EMIT(NFA_CLASS_DIGIT); | |
| 974 break; | |
| 975 case CLASS_GRAPH: | |
| 976 EMIT(NFA_CLASS_GRAPH); | |
| 977 break; | |
| 978 case CLASS_LOWER: | |
| 979 EMIT(NFA_CLASS_LOWER); | |
| 980 break; | |
| 981 case CLASS_PRINT: | |
| 982 EMIT(NFA_CLASS_PRINT); | |
| 983 break; | |
| 984 case CLASS_PUNCT: | |
| 985 EMIT(NFA_CLASS_PUNCT); | |
| 986 break; | |
| 987 case CLASS_SPACE: | |
| 988 EMIT(NFA_CLASS_SPACE); | |
| 989 break; | |
| 990 case CLASS_UPPER: | |
| 991 EMIT(NFA_CLASS_UPPER); | |
| 992 break; | |
| 993 case CLASS_XDIGIT: | |
| 994 EMIT(NFA_CLASS_XDIGIT); | |
| 995 break; | |
| 996 case CLASS_TAB: | |
| 997 EMIT(NFA_CLASS_TAB); | |
| 998 break; | |
| 999 case CLASS_RETURN: | |
| 1000 EMIT(NFA_CLASS_RETURN); | |
| 1001 break; | |
| 1002 case CLASS_BACKSPACE: | |
| 1003 EMIT(NFA_CLASS_BACKSPACE); | |
| 1004 break; | |
| 1005 case CLASS_ESCAPE: | |
| 1006 EMIT(NFA_CLASS_ESCAPE); | |
| 1007 break; | |
| 1008 } | |
| 1009 TRY_NEG(); | |
| 1010 EMIT_GLUE(); | |
| 1011 continue; | |
| 1012 } | |
| 1013 /* Try equivalence class [=a=] and the like */ | |
| 1014 if (equiclass != 0) | |
| 1015 { | |
| 1016 result = nfa_emit_equi_class(equiclass, negated); | |
| 1017 if (result == FAIL) | |
| 1018 { | |
| 1019 /* should never happen */ | |
| 1020 EMSG_RET_FAIL(_("E868: Error building NFA with equivalence class!")); | |
| 1021 } | |
| 1022 EMIT_GLUE(); | |
| 1023 continue; | |
| 1024 } | |
| 1025 /* Try collating class like [. .] */ | |
| 1026 if (collclass != 0) | |
| 1027 { | |
| 1028 startc = collclass; /* allow [.a.]-x as a range */ | |
| 1029 /* Will emit the proper atom at the end of the | |
| 1030 * while loop. */ | |
| 1031 } | |
| 1032 } | |
| 1033 /* Try a range like 'a-x' or '\t-z' */ | |
| 1034 if (*regparse == '-') | |
| 1035 { | |
| 1036 emit_range = TRUE; | |
| 1037 startc = oldstartc; | |
| 1038 nfa_inc(®parse); | |
| 1039 continue; /* reading the end of the range */ | |
| 1040 } | |
| 1041 | |
| 1042 /* Now handle simple and escaped characters. | |
| 1043 * Only "\]", "\^", "\]" and "\\" are special in Vi. Vim | |
| 1044 * accepts "\t", "\e", etc., but only when the 'l' flag in | |
| 1045 * 'cpoptions' is not included. | |
| 1046 * Posix doesn't recognize backslash at all. | |
| 1047 */ | |
| 1048 if (*regparse == '\\' | |
| 1049 && !cpo_bsl | |
| 1050 && regparse + 1 <= endp | |
| 1051 && (vim_strchr(REGEXP_INRANGE, regparse[1]) != NULL | |
| 1052 || (!cpo_lit | |
| 1053 && vim_strchr(REGEXP_ABBR, regparse[1]) | |
| 1054 != NULL) | |
| 1055 ) | |
| 1056 ) | |
| 1057 { | |
| 1058 nfa_inc(®parse); | |
| 1059 | |
|
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1060 if (*regparse == 'n') |
| 4444 | 1061 startc = reg_string ? NL : NFA_NEWL; |
| 1062 else | |
| 1063 if (*regparse == 'd' | |
| 1064 || *regparse == 'o' | |
| 1065 || *regparse == 'x' | |
| 1066 || *regparse == 'u' | |
| 1067 || *regparse == 'U' | |
| 1068 ) | |
| 1069 { | |
| 1070 /* TODO(RE) This needs more testing */ | |
| 1071 startc = coll_get_char(); | |
| 1072 got_coll_char = TRUE; | |
| 1073 nfa_dec(®parse); | |
| 1074 } | |
| 1075 else | |
| 1076 { | |
| 1077 /* \r,\t,\e,\b */ | |
| 1078 startc = backslash_trans(*regparse); | |
| 1079 } | |
| 1080 } | |
| 1081 | |
| 1082 /* Normal printable char */ | |
| 1083 if (startc == -1) | |
| 1084 #ifdef FEAT_MBYTE | |
| 1085 startc = (*mb_ptr2char)(regparse); | |
| 1086 #else | |
| 1087 startc = *regparse; | |
| 1088 #endif | |
| 1089 | |
| 1090 /* Previous char was '-', so this char is end of range. */ | |
| 1091 if (emit_range) | |
| 1092 { | |
| 1093 endc = startc; startc = oldstartc; | |
| 1094 if (startc > endc) | |
| 1095 EMSG_RET_FAIL(_(e_invrange)); | |
| 1096 #ifdef FEAT_MBYTE | |
| 1097 if (has_mbyte && ((*mb_char2len)(startc) > 1 | |
| 1098 || (*mb_char2len)(endc) > 1)) | |
| 1099 { | |
| 1100 if (endc > startc + 256) | |
| 1101 EMSG_RET_FAIL(_(e_invrange)); | |
| 1102 /* Emit the range. "startc" was already emitted, so | |
| 1103 * skip it. */ | |
| 1104 for (c = startc + 1; c <= endc; c++) | |
| 1105 { | |
|
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1106 EMIT(c); |
| 4444 | 1107 TRY_NEG(); |
| 1108 EMIT_GLUE(); | |
| 1109 } | |
| 1110 emit_range = FALSE; | |
| 1111 } | |
| 1112 else | |
| 1113 #endif | |
| 1114 { | |
| 1115 #ifdef EBCDIC | |
| 1116 int alpha_only = FALSE; | |
| 1117 | |
| 1118 /* for alphabetical range skip the gaps | |
| 1119 * 'i'-'j', 'r'-'s', 'I'-'J' and 'R'-'S'. */ | |
| 1120 if (isalpha(startc) && isalpha(endc)) | |
| 1121 alpha_only = TRUE; | |
| 1122 #endif | |
| 1123 /* Emit the range. "startc" was already emitted, so | |
| 1124 * skip it. */ | |
| 1125 for (c = startc + 1; c <= endc; c++) | |
| 1126 #ifdef EBCDIC | |
| 1127 if (!alpha_only || isalpha(startc)) | |
| 1128 #endif | |
| 1129 { | |
| 1130 EMIT(c); | |
| 1131 TRY_NEG(); | |
| 1132 EMIT_GLUE(); | |
| 1133 } | |
| 1134 emit_range = FALSE; | |
| 1135 } | |
| 1136 } | |
| 1137 else | |
| 1138 { | |
| 1139 /* | |
| 1140 * This char (startc) is not part of a range. Just | |
| 1141 * emit it. | |
| 1142 * | |
| 1143 * Normally, simply emit startc. But if we get char | |
| 1144 * code=0 from a collating char, then replace it with | |
| 1145 * 0x0a. | |
| 1146 * | |
| 1147 * This is needed to completely mimic the behaviour of | |
| 1148 * the backtracking engine. | |
| 1149 */ | |
| 1150 if (got_coll_char == TRUE && startc == 0) | |
| 1151 EMIT(0x0a); | |
| 1152 else | |
|
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1153 EMIT(startc); |
| 4444 | 1154 TRY_NEG(); |
| 1155 EMIT_GLUE(); | |
| 1156 } | |
| 1157 | |
| 1158 nfa_inc(®parse); | |
| 1159 } /* while (p < endp) */ | |
| 1160 | |
| 1161 nfa_dec(®parse); | |
| 1162 if (*regparse == '-') /* if last, '-' is just a char */ | |
| 1163 { | |
| 1164 EMIT('-'); | |
| 1165 TRY_NEG(); | |
| 1166 EMIT_GLUE(); | |
| 1167 } | |
| 1168 nfa_inc(®parse); | |
| 1169 | |
| 1170 if (extra == ADD_NL) /* \_[] also matches \n */ | |
| 1171 { | |
| 1172 EMIT(reg_string ? NL : NFA_NEWL); | |
| 1173 TRY_NEG(); | |
| 1174 EMIT_GLUE(); | |
| 1175 } | |
| 1176 | |
| 1177 /* skip the trailing ] */ | |
| 1178 regparse = endp; | |
| 1179 nfa_inc(®parse); | |
| 1180 if (negated == TRUE) | |
| 1181 { | |
| 1182 /* Mark end of negated char range */ | |
| 1183 EMIT(NFA_END_NEG_RANGE); | |
| 1184 EMIT(NFA_CONCAT); | |
| 1185 } | |
| 1186 return OK; | |
| 1187 } /* if exists closing ] */ | |
| 1188 else if (reg_strict) | |
| 1189 { | |
| 1190 syntax_error = TRUE; | |
| 1191 EMSG_RET_FAIL(_(e_missingbracket)); | |
| 1192 } | |
| 1193 | |
| 1194 /* FALLTHROUGH */ | |
| 1195 default: | |
| 1196 { | |
| 1197 #ifdef FEAT_MBYTE | |
| 1198 int plen; | |
| 1199 | |
| 1200 nfa_do_multibyte: | |
|
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1201 /* Length of current char with composing chars. */ |
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1202 if (enc_utf8 && clen != (plen = (*mb_ptr2len)(old_regparse))) |
| 4444 | 1203 { |
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1204 /* A base character plus composing characters. |
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1205 * This requires creating a separate atom as if enclosing |
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1206 * the characters in (), where NFA_COMPOSING is the ( and |
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1207 * NFA_END_COMPOSING is the ). Note that right now we are |
| 4444 | 1208 * building the postfix form, not the NFA itself; |
| 1209 * a composing char could be: a, b, c, NFA_COMPOSING | |
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1210 * where 'b' and 'c' are chars with codes > 256. */ |
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1211 i = 0; |
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1212 for (;;) |
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1213 { |
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1214 EMIT(c); |
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1215 if (i > 0) |
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1216 EMIT(NFA_CONCAT); |
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1217 if (i += utf_char2len(c) >= plen) |
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1218 break; |
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1219 c = utf_ptr2char(old_regparse + i); |
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1220 } |
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1221 EMIT(NFA_COMPOSING); |
| 4444 | 1222 regparse = old_regparse + plen; |
| 1223 } | |
| 1224 else | |
| 1225 #endif | |
| 1226 { | |
| 1227 c = no_Magic(c); | |
| 1228 EMIT(c); | |
| 1229 } | |
| 1230 return OK; | |
| 1231 } | |
| 1232 } | |
| 1233 | |
| 1234 #undef TRY_NEG | |
| 1235 #undef EMIT_GLUE | |
| 1236 | |
| 1237 return OK; | |
| 1238 } | |
| 1239 | |
| 1240 /* | |
| 1241 * Parse something followed by possible [*+=]. | |
| 1242 * | |
| 1243 * A piece is an atom, possibly followed by a multi, an indication of how many | |
| 1244 * times the atom can be matched. Example: "a*" matches any sequence of "a" | |
| 1245 * characters: "", "a", "aa", etc. | |
| 1246 * | |
| 1247 * piece ::= atom | |
| 1248 * or atom multi | |
| 1249 */ | |
| 1250 static int | |
| 1251 nfa_regpiece() | |
| 1252 { | |
| 1253 int i; | |
| 1254 int op; | |
| 1255 int ret; | |
| 1256 long minval, maxval; | |
| 1257 int greedy = TRUE; /* Braces are prefixed with '-' ? */ | |
| 1258 char_u *old_regparse, *new_regparse; | |
| 1259 int c2; | |
| 1260 int *old_post_ptr, *my_post_start; | |
| 1261 int old_regnpar; | |
| 1262 int quest; | |
| 1263 | |
| 1264 /* Save the current position in the regexp, so that we can use it if | |
| 1265 * <atom>{m,n} is next. */ | |
| 1266 old_regparse = regparse; | |
| 1267 /* Save current number of open parenthesis, so we can use it if | |
| 1268 * <atom>{m,n} is next */ | |
| 1269 old_regnpar = regnpar; | |
| 1270 /* store current pos in the postfix form, for \{m,n} involving 0s */ | |
| 1271 my_post_start = post_ptr; | |
| 1272 | |
| 1273 ret = nfa_regatom(); | |
| 1274 if (ret == FAIL) | |
| 1275 return FAIL; /* cascaded error */ | |
| 1276 | |
| 1277 op = peekchr(); | |
| 1278 if (re_multi_type(op) == NOT_MULTI) | |
| 1279 return OK; | |
| 1280 | |
| 1281 skipchr(); | |
| 1282 switch (op) | |
| 1283 { | |
| 1284 case Magic('*'): | |
| 1285 EMIT(NFA_STAR); | |
| 1286 break; | |
| 1287 | |
| 1288 case Magic('+'): | |
| 1289 /* | |
| 1290 * Trick: Normally, (a*)\+ would match the whole input "aaa". The | |
| 1291 * first and only submatch would be "aaa". But the backtracking | |
| 1292 * engine interprets the plus as "try matching one more time", and | |
| 1293 * a* matches a second time at the end of the input, the empty | |
| 1294 * string. | |
| 1295 * The submatch will the empty string. | |
| 1296 * | |
| 1297 * In order to be consistent with the old engine, we disable | |
| 1298 * NFA_PLUS, and replace <atom>+ with <atom><atom>* | |
| 1299 */ | |
| 1300 /* EMIT(NFA_PLUS); */ | |
| 1301 regnpar = old_regnpar; | |
| 1302 regparse = old_regparse; | |
| 1303 curchr = -1; | |
| 1304 if (nfa_regatom() == FAIL) | |
| 1305 return FAIL; | |
| 1306 EMIT(NFA_STAR); | |
| 1307 EMIT(NFA_CONCAT); | |
| 1308 skipchr(); /* skip the \+ */ | |
| 1309 break; | |
| 1310 | |
| 1311 case Magic('@'): | |
| 1312 op = no_Magic(getchr()); | |
| 1313 switch(op) | |
| 1314 { | |
| 1315 case '=': | |
| 1316 EMIT(NFA_PREV_ATOM_NO_WIDTH); | |
| 1317 break; | |
| 1318 case '!': | |
| 1319 case '<': | |
| 1320 case '>': | |
| 1321 /* Not supported yet */ | |
| 1322 return FAIL; | |
| 1323 default: | |
| 1324 syntax_error = TRUE; | |
| 4450 | 1325 EMSGN(_("E869: (NFA) Unknown operator '\\@%c'"), op); |
| 4444 | 1326 return FAIL; |
| 1327 } | |
| 1328 break; | |
| 1329 | |
| 1330 case Magic('?'): | |
| 1331 case Magic('='): | |
| 1332 EMIT(NFA_QUEST); | |
| 1333 break; | |
| 1334 | |
| 1335 case Magic('{'): | |
| 1336 /* a{2,5} will expand to 'aaa?a?a?' | |
| 1337 * a{-1,3} will expand to 'aa??a??', where ?? is the nongreedy | |
| 1338 * version of '?' | |
| 1339 * \v(ab){2,3} will expand to '(ab)(ab)(ab)?', where all the | |
| 1340 * parenthesis have the same id | |
| 1341 */ | |
| 1342 | |
| 1343 greedy = TRUE; | |
| 1344 c2 = peekchr(); | |
| 1345 if (c2 == '-' || c2 == Magic('-')) | |
| 1346 { | |
| 1347 skipchr(); | |
| 1348 greedy = FALSE; | |
| 1349 } | |
| 1350 if (!read_limits(&minval, &maxval)) | |
| 1351 { | |
| 1352 syntax_error = TRUE; | |
| 1353 EMSG_RET_FAIL(_("E870: (NFA regexp) Error reading repetition limits")); | |
| 1354 } | |
| 1355 /* <atom>{0,inf}, <atom>{0,} and <atom>{} are equivalent to | |
| 1356 * <atom>* */ | |
| 1357 if (minval == 0 && maxval == MAX_LIMIT && greedy) | |
| 1358 { | |
| 1359 EMIT(NFA_STAR); | |
| 1360 break; | |
| 1361 } | |
| 1362 | |
| 1363 if (maxval > NFA_BRACES_MAXLIMIT) | |
| 1364 { | |
| 1365 /* This would yield a huge automaton and use too much memory. | |
| 1366 * Revert to old engine */ | |
| 1367 return FAIL; | |
| 1368 } | |
| 1369 | |
| 1370 /* Special case: x{0} or x{-0} */ | |
| 1371 if (maxval == 0) | |
| 1372 { | |
| 1373 /* Ignore result of previous call to nfa_regatom() */ | |
| 1374 post_ptr = my_post_start; | |
| 1375 /* NFA_SKIP_CHAR has 0-length and works everywhere */ | |
| 1376 EMIT(NFA_SKIP_CHAR); | |
| 1377 return OK; | |
| 1378 } | |
| 1379 | |
| 1380 /* Ignore previous call to nfa_regatom() */ | |
| 1381 post_ptr = my_post_start; | |
| 1382 /* Save pos after the repeated atom and the \{} */ | |
| 1383 new_regparse = regparse; | |
| 1384 | |
| 1385 new_regparse = regparse; | |
| 1386 quest = (greedy == TRUE? NFA_QUEST : NFA_QUEST_NONGREEDY); | |
| 1387 for (i = 0; i < maxval; i++) | |
| 1388 { | |
| 1389 /* Goto beginning of the repeated atom */ | |
| 1390 regparse = old_regparse; | |
| 1391 curchr = -1; | |
| 1392 /* Restore count of parenthesis */ | |
| 1393 regnpar = old_regnpar; | |
| 1394 old_post_ptr = post_ptr; | |
| 1395 if (nfa_regatom() == FAIL) | |
| 1396 return FAIL; | |
| 1397 /* after "minval" times, atoms are optional */ | |
| 1398 if (i + 1 > minval) | |
| 1399 EMIT(quest); | |
| 1400 if (old_post_ptr != my_post_start) | |
| 1401 EMIT(NFA_CONCAT); | |
| 1402 } | |
| 1403 | |
| 1404 /* Go to just after the repeated atom and the \{} */ | |
| 1405 regparse = new_regparse; | |
| 1406 curchr = -1; | |
| 1407 | |
| 1408 break; | |
| 1409 | |
| 1410 | |
| 1411 default: | |
| 1412 break; | |
| 1413 } /* end switch */ | |
| 1414 | |
| 1415 if (re_multi_type(peekchr()) != NOT_MULTI) | |
| 1416 { | |
| 1417 /* Can't have a multi follow a multi. */ | |
| 1418 syntax_error = TRUE; | |
| 1419 EMSG_RET_FAIL(_("E871: (NFA regexp) Can't have a multi follow a multi !")); | |
| 1420 } | |
| 1421 | |
| 1422 return OK; | |
| 1423 } | |
| 1424 | |
| 1425 /* | |
| 1426 * Parse one or more pieces, concatenated. It matches a match for the | |
| 1427 * first piece, followed by a match for the second piece, etc. Example: | |
| 1428 * "f[0-9]b", first matches "f", then a digit and then "b". | |
| 1429 * | |
| 1430 * concat ::= piece | |
| 1431 * or piece piece | |
| 1432 * or piece piece piece | |
| 1433 * etc. | |
| 1434 */ | |
| 1435 static int | |
| 1436 nfa_regconcat() | |
| 1437 { | |
| 1438 int cont = TRUE; | |
| 1439 int first = TRUE; | |
| 1440 | |
| 1441 while (cont) | |
| 1442 { | |
| 1443 switch (peekchr()) | |
| 1444 { | |
| 1445 case NUL: | |
| 1446 case Magic('|'): | |
| 1447 case Magic('&'): | |
| 1448 case Magic(')'): | |
| 1449 cont = FALSE; | |
| 1450 break; | |
| 1451 | |
| 1452 case Magic('Z'): | |
| 1453 #ifdef FEAT_MBYTE | |
| 1454 regflags |= RF_ICOMBINE; | |
| 1455 #endif | |
| 1456 skipchr_keepstart(); | |
| 1457 break; | |
| 1458 case Magic('c'): | |
| 1459 regflags |= RF_ICASE; | |
| 1460 skipchr_keepstart(); | |
| 1461 break; | |
| 1462 case Magic('C'): | |
| 1463 regflags |= RF_NOICASE; | |
| 1464 skipchr_keepstart(); | |
| 1465 break; | |
| 1466 case Magic('v'): | |
| 1467 reg_magic = MAGIC_ALL; | |
| 1468 skipchr_keepstart(); | |
| 1469 curchr = -1; | |
| 1470 break; | |
| 1471 case Magic('m'): | |
| 1472 reg_magic = MAGIC_ON; | |
| 1473 skipchr_keepstart(); | |
| 1474 curchr = -1; | |
| 1475 break; | |
| 1476 case Magic('M'): | |
| 1477 reg_magic = MAGIC_OFF; | |
| 1478 skipchr_keepstart(); | |
| 1479 curchr = -1; | |
| 1480 break; | |
| 1481 case Magic('V'): | |
| 1482 reg_magic = MAGIC_NONE; | |
| 1483 skipchr_keepstart(); | |
| 1484 curchr = -1; | |
| 1485 break; | |
| 1486 | |
| 1487 default: | |
| 1488 if (nfa_regpiece() == FAIL) | |
| 1489 return FAIL; | |
| 1490 if (first == FALSE) | |
| 1491 EMIT(NFA_CONCAT); | |
| 1492 else | |
| 1493 first = FALSE; | |
| 1494 break; | |
| 1495 } | |
| 1496 } | |
| 1497 | |
| 1498 return OK; | |
| 1499 } | |
| 1500 | |
| 1501 /* | |
| 1502 * Parse a branch, one or more concats, separated by "\&". It matches the | |
| 1503 * last concat, but only if all the preceding concats also match at the same | |
| 1504 * position. Examples: | |
| 1505 * "foobeep\&..." matches "foo" in "foobeep". | |
| 1506 * ".*Peter\&.*Bob" matches in a line containing both "Peter" and "Bob" | |
| 1507 * | |
| 1508 * branch ::= concat | |
| 1509 * or concat \& concat | |
| 1510 * or concat \& concat \& concat | |
| 1511 * etc. | |
| 1512 */ | |
| 1513 static int | |
| 1514 nfa_regbranch() | |
| 1515 { | |
| 1516 int ch; | |
| 1517 int *old_post_ptr; | |
| 1518 | |
| 1519 old_post_ptr = post_ptr; | |
| 1520 | |
| 1521 /* First branch, possibly the only one */ | |
| 1522 if (nfa_regconcat() == FAIL) | |
| 1523 return FAIL; | |
| 1524 | |
| 1525 ch = peekchr(); | |
| 1526 /* Try next concats */ | |
| 1527 while (ch == Magic('&')) | |
| 1528 { | |
| 1529 skipchr(); | |
| 1530 EMIT(NFA_NOPEN); | |
| 1531 EMIT(NFA_PREV_ATOM_NO_WIDTH); | |
| 1532 old_post_ptr = post_ptr; | |
| 1533 if (nfa_regconcat() == FAIL) | |
| 1534 return FAIL; | |
| 1535 /* if concat is empty, skip a input char. But do emit a node */ | |
| 1536 if (old_post_ptr == post_ptr) | |
| 1537 EMIT(NFA_SKIP_CHAR); | |
| 1538 EMIT(NFA_CONCAT); | |
| 1539 ch = peekchr(); | |
| 1540 } | |
| 1541 | |
| 1542 /* Even if a branch is empty, emit one node for it */ | |
| 1543 if (old_post_ptr == post_ptr) | |
| 1544 EMIT(NFA_SKIP_CHAR); | |
| 1545 | |
| 1546 return OK; | |
| 1547 } | |
| 1548 | |
| 1549 /* | |
| 1550 * Parse a pattern, one or more branches, separated by "\|". It matches | |
| 1551 * anything that matches one of the branches. Example: "foo\|beep" matches | |
| 1552 * "foo" and matches "beep". If more than one branch matches, the first one | |
| 1553 * is used. | |
| 1554 * | |
| 1555 * pattern ::= branch | |
| 1556 * or branch \| branch | |
| 1557 * or branch \| branch \| branch | |
| 1558 * etc. | |
| 1559 */ | |
| 1560 static int | |
| 1561 nfa_reg(paren) | |
| 1562 int paren; /* REG_NOPAREN, REG_PAREN, REG_NPAREN or REG_ZPAREN */ | |
| 1563 { | |
| 1564 int parno = 0; | |
| 1565 | |
| 1566 #ifdef FEAT_SYN_HL | |
| 1567 #endif | |
| 1568 if (paren == REG_PAREN) | |
| 1569 { | |
| 1570 if (regnpar >= NSUBEXP) /* Too many `(' */ | |
| 1571 { | |
| 1572 syntax_error = TRUE; | |
| 1573 EMSG_RET_FAIL(_("E872: (NFA regexp) Too many '('")); | |
| 1574 } | |
| 1575 parno = regnpar++; | |
| 1576 } | |
| 1577 | |
| 1578 if (nfa_regbranch() == FAIL) | |
| 1579 return FAIL; /* cascaded error */ | |
| 1580 | |
| 1581 while (peekchr() == Magic('|')) | |
| 1582 { | |
| 1583 skipchr(); | |
| 1584 if (nfa_regbranch() == FAIL) | |
| 1585 return FAIL; /* cascaded error */ | |
| 1586 EMIT(NFA_OR); | |
| 1587 } | |
| 1588 | |
| 1589 /* Check for proper termination. */ | |
| 1590 if (paren != REG_NOPAREN && getchr() != Magic(')')) | |
| 1591 { | |
| 1592 syntax_error = TRUE; | |
| 1593 if (paren == REG_NPAREN) | |
| 1594 EMSG2_RET_FAIL(_(e_unmatchedpp), reg_magic == MAGIC_ALL); | |
| 1595 else | |
| 1596 EMSG2_RET_FAIL(_(e_unmatchedp), reg_magic == MAGIC_ALL); | |
| 1597 } | |
| 1598 else if (paren == REG_NOPAREN && peekchr() != NUL) | |
| 1599 { | |
| 1600 syntax_error = TRUE; | |
| 1601 if (peekchr() == Magic(')')) | |
| 1602 EMSG2_RET_FAIL(_(e_unmatchedpar), reg_magic == MAGIC_ALL); | |
| 1603 else | |
| 1604 EMSG_RET_FAIL(_("E873: (NFA regexp) proper termination error")); | |
| 1605 } | |
| 1606 /* | |
| 1607 * Here we set the flag allowing back references to this set of | |
| 1608 * parentheses. | |
| 1609 */ | |
| 1610 if (paren == REG_PAREN) | |
| 1611 { | |
| 1612 had_endbrace[parno] = TRUE; /* have seen the close paren */ | |
| 1613 EMIT(NFA_MOPEN + parno); | |
| 1614 } | |
| 1615 | |
| 1616 return OK; | |
| 1617 } | |
| 1618 | |
| 1619 typedef struct | |
| 1620 { | |
| 1621 char_u *start[NSUBEXP]; | |
| 1622 char_u *end[NSUBEXP]; | |
| 1623 lpos_T startpos[NSUBEXP]; | |
| 1624 lpos_T endpos[NSUBEXP]; | |
| 1625 } regsub_T; | |
| 1626 | |
| 1627 static int nfa_regmatch __ARGS((nfa_state_T *start, regsub_T *submatch, regsub_T *m)); | |
| 1628 | |
| 1629 #ifdef DEBUG | |
| 1630 static char_u code[50]; | |
| 1631 | |
| 1632 static void | |
| 1633 nfa_set_code(c) | |
| 1634 int c; | |
| 1635 { | |
| 1636 int addnl = FALSE; | |
| 1637 | |
| 1638 if (c >= NFA_FIRST_NL && c <= NFA_LAST_NL) | |
| 1639 { | |
| 1640 addnl = TRUE; | |
| 1641 c -= ADD_NL; | |
| 1642 } | |
| 1643 | |
| 1644 STRCPY(code, ""); | |
| 1645 switch (c) | |
| 1646 { | |
| 1647 case NFA_MATCH: STRCPY(code, "NFA_MATCH "); break; | |
| 1648 case NFA_SPLIT: STRCPY(code, "NFA_SPLIT "); break; | |
| 1649 case NFA_CONCAT: STRCPY(code, "NFA_CONCAT "); break; | |
| 1650 case NFA_NEWL: STRCPY(code, "NFA_NEWL "); break; | |
| 1651 case NFA_ZSTART: STRCPY(code, "NFA_ZSTART"); break; | |
| 1652 case NFA_ZEND: STRCPY(code, "NFA_ZEND"); break; | |
| 1653 | |
| 1654 case NFA_PREV_ATOM_NO_WIDTH: | |
| 1655 STRCPY(code, "NFA_PREV_ATOM_NO_WIDTH"); break; | |
| 1656 case NFA_NOPEN: STRCPY(code, "NFA_MOPEN_INVISIBLE"); break; | |
| 1657 case NFA_NCLOSE: STRCPY(code, "NFA_MCLOSE_INVISIBLE"); break; | |
| 1658 case NFA_START_INVISIBLE: STRCPY(code, "NFA_START_INVISIBLE"); break; | |
| 1659 case NFA_END_INVISIBLE: STRCPY(code, "NFA_END_INVISIBLE"); break; | |
| 1660 | |
| 1661 case NFA_COMPOSING: STRCPY(code, "NFA_COMPOSING"); break; | |
| 1662 case NFA_END_COMPOSING: STRCPY(code, "NFA_END_COMPOSING"); break; | |
| 1663 | |
| 1664 case NFA_MOPEN + 0: | |
| 1665 case NFA_MOPEN + 1: | |
| 1666 case NFA_MOPEN + 2: | |
| 1667 case NFA_MOPEN + 3: | |
| 1668 case NFA_MOPEN + 4: | |
| 1669 case NFA_MOPEN + 5: | |
| 1670 case NFA_MOPEN + 6: | |
| 1671 case NFA_MOPEN + 7: | |
| 1672 case NFA_MOPEN + 8: | |
| 1673 case NFA_MOPEN + 9: | |
| 1674 STRCPY(code, "NFA_MOPEN(x)"); | |
| 1675 code[10] = c - NFA_MOPEN + '0'; | |
| 1676 break; | |
| 1677 case NFA_MCLOSE + 0: | |
| 1678 case NFA_MCLOSE + 1: | |
| 1679 case NFA_MCLOSE + 2: | |
| 1680 case NFA_MCLOSE + 3: | |
| 1681 case NFA_MCLOSE + 4: | |
| 1682 case NFA_MCLOSE + 5: | |
| 1683 case NFA_MCLOSE + 6: | |
| 1684 case NFA_MCLOSE + 7: | |
| 1685 case NFA_MCLOSE + 8: | |
| 1686 case NFA_MCLOSE + 9: | |
| 1687 STRCPY(code, "NFA_MCLOSE(x)"); | |
| 1688 code[11] = c - NFA_MCLOSE + '0'; | |
| 1689 break; | |
| 1690 case NFA_EOL: STRCPY(code, "NFA_EOL "); break; | |
| 1691 case NFA_BOL: STRCPY(code, "NFA_BOL "); break; | |
| 1692 case NFA_EOW: STRCPY(code, "NFA_EOW "); break; | |
| 1693 case NFA_BOW: STRCPY(code, "NFA_BOW "); break; | |
| 1694 case NFA_STAR: STRCPY(code, "NFA_STAR "); break; | |
| 1695 case NFA_PLUS: STRCPY(code, "NFA_PLUS "); break; | |
| 1696 case NFA_NOT: STRCPY(code, "NFA_NOT "); break; | |
| 1697 case NFA_SKIP_CHAR: STRCPY(code, "NFA_SKIP_CHAR"); break; | |
| 1698 case NFA_OR: STRCPY(code, "NFA_OR"); break; | |
| 1699 case NFA_QUEST: STRCPY(code, "NFA_QUEST"); break; | |
| 1700 case NFA_QUEST_NONGREEDY: STRCPY(code, "NFA_QUEST_NON_GREEDY"); break; | |
| 1701 case NFA_END_NEG_RANGE: STRCPY(code, "NFA_END_NEG_RANGE"); break; | |
| 1702 case NFA_CLASS_ALNUM: STRCPY(code, "NFA_CLASS_ALNUM"); break; | |
| 1703 case NFA_CLASS_ALPHA: STRCPY(code, "NFA_CLASS_ALPHA"); break; | |
| 1704 case NFA_CLASS_BLANK: STRCPY(code, "NFA_CLASS_BLANK"); break; | |
| 1705 case NFA_CLASS_CNTRL: STRCPY(code, "NFA_CLASS_CNTRL"); break; | |
| 1706 case NFA_CLASS_DIGIT: STRCPY(code, "NFA_CLASS_DIGIT"); break; | |
| 1707 case NFA_CLASS_GRAPH: STRCPY(code, "NFA_CLASS_GRAPH"); break; | |
| 1708 case NFA_CLASS_LOWER: STRCPY(code, "NFA_CLASS_LOWER"); break; | |
| 1709 case NFA_CLASS_PRINT: STRCPY(code, "NFA_CLASS_PRINT"); break; | |
| 1710 case NFA_CLASS_PUNCT: STRCPY(code, "NFA_CLASS_PUNCT"); break; | |
| 1711 case NFA_CLASS_SPACE: STRCPY(code, "NFA_CLASS_SPACE"); break; | |
| 1712 case NFA_CLASS_UPPER: STRCPY(code, "NFA_CLASS_UPPER"); break; | |
| 1713 case NFA_CLASS_XDIGIT: STRCPY(code, "NFA_CLASS_XDIGIT"); break; | |
| 1714 case NFA_CLASS_TAB: STRCPY(code, "NFA_CLASS_TAB"); break; | |
| 1715 case NFA_CLASS_RETURN: STRCPY(code, "NFA_CLASS_RETURN"); break; | |
| 1716 case NFA_CLASS_BACKSPACE: STRCPY(code, "NFA_CLASS_BACKSPACE"); break; | |
| 1717 case NFA_CLASS_ESCAPE: STRCPY(code, "NFA_CLASS_ESCAPE"); break; | |
| 1718 | |
| 1719 case NFA_ANY: STRCPY(code, "NFA_ANY"); break; | |
| 1720 case NFA_IDENT: STRCPY(code, "NFA_IDENT"); break; | |
| 1721 case NFA_SIDENT:STRCPY(code, "NFA_SIDENT"); break; | |
| 1722 case NFA_KWORD: STRCPY(code, "NFA_KWORD"); break; | |
| 1723 case NFA_SKWORD:STRCPY(code, "NFA_SKWORD"); break; | |
| 1724 case NFA_FNAME: STRCPY(code, "NFA_FNAME"); break; | |
| 1725 case NFA_SFNAME:STRCPY(code, "NFA_SFNAME"); break; | |
| 1726 case NFA_PRINT: STRCPY(code, "NFA_PRINT"); break; | |
| 1727 case NFA_SPRINT:STRCPY(code, "NFA_SPRINT"); break; | |
| 1728 case NFA_WHITE: STRCPY(code, "NFA_WHITE"); break; | |
| 1729 case NFA_NWHITE:STRCPY(code, "NFA_NWHITE"); break; | |
| 1730 case NFA_DIGIT: STRCPY(code, "NFA_DIGIT"); break; | |
| 1731 case NFA_NDIGIT:STRCPY(code, "NFA_NDIGIT"); break; | |
| 1732 case NFA_HEX: STRCPY(code, "NFA_HEX"); break; | |
| 1733 case NFA_NHEX: STRCPY(code, "NFA_NHEX"); break; | |
| 1734 case NFA_OCTAL: STRCPY(code, "NFA_OCTAL"); break; | |
| 1735 case NFA_NOCTAL:STRCPY(code, "NFA_NOCTAL"); break; | |
| 1736 case NFA_WORD: STRCPY(code, "NFA_WORD"); break; | |
| 1737 case NFA_NWORD: STRCPY(code, "NFA_NWORD"); break; | |
| 1738 case NFA_HEAD: STRCPY(code, "NFA_HEAD"); break; | |
| 1739 case NFA_NHEAD: STRCPY(code, "NFA_NHEAD"); break; | |
| 1740 case NFA_ALPHA: STRCPY(code, "NFA_ALPHA"); break; | |
| 1741 case NFA_NALPHA:STRCPY(code, "NFA_NALPHA"); break; | |
| 1742 case NFA_LOWER: STRCPY(code, "NFA_LOWER"); break; | |
| 1743 case NFA_NLOWER:STRCPY(code, "NFA_NLOWER"); break; | |
| 1744 case NFA_UPPER: STRCPY(code, "NFA_UPPER"); break; | |
| 1745 case NFA_NUPPER:STRCPY(code, "NFA_NUPPER"); break; | |
| 1746 | |
| 1747 default: | |
| 1748 STRCPY(code, "CHAR(x)"); | |
| 1749 code[5] = c; | |
| 1750 } | |
| 1751 | |
| 1752 if (addnl == TRUE) | |
| 1753 STRCAT(code, " + NEWLINE "); | |
| 1754 | |
| 1755 } | |
| 1756 | |
| 1757 #ifdef ENABLE_LOG | |
| 1758 static FILE *log_fd; | |
| 1759 | |
| 1760 /* | |
| 1761 * Print the postfix notation of the current regexp. | |
| 1762 */ | |
| 1763 static void | |
| 1764 nfa_postfix_dump(expr, retval) | |
| 1765 char_u *expr; | |
| 1766 int retval; | |
| 1767 { | |
| 1768 int *p; | |
| 1769 FILE *f; | |
| 1770 | |
| 1771 f = fopen("LOG.log", "a"); | |
| 1772 if (f != NULL) | |
| 1773 { | |
| 1774 fprintf(f, "\n-------------------------\n"); | |
| 1775 if (retval == FAIL) | |
| 1776 fprintf(f, ">>> NFA engine failed ... \n"); | |
| 1777 else if (retval == OK) | |
| 1778 fprintf(f, ">>> NFA engine succeeded !\n"); | |
| 1779 fprintf(f, "Regexp: \"%s\"\nPostfix notation (char): \"", expr); | |
| 4464 | 1780 for (p = post_start; *p && p < post_end; p++) |
| 4444 | 1781 { |
| 1782 nfa_set_code(*p); | |
| 1783 fprintf(f, "%s, ", code); | |
| 1784 } | |
| 1785 fprintf(f, "\"\nPostfix notation (int): "); | |
| 4464 | 1786 for (p = post_start; *p && p < post_end; p++) |
| 4444 | 1787 fprintf(f, "%d ", *p); |
| 1788 fprintf(f, "\n\n"); | |
| 1789 fclose(f); | |
| 1790 } | |
| 1791 } | |
| 1792 | |
| 1793 /* | |
| 1794 * Print the NFA starting with a root node "state". | |
| 1795 */ | |
| 1796 static void | |
| 1797 nfa_print_state(debugf, state, ident) | |
| 1798 FILE *debugf; | |
| 1799 nfa_state_T *state; | |
| 1800 int ident; | |
| 1801 { | |
| 1802 int i; | |
| 1803 | |
| 1804 if (state == NULL) | |
| 1805 return; | |
| 1806 | |
| 1807 fprintf(debugf, "(%2d)", abs(state->id)); | |
| 1808 for (i = 0; i < ident; i++) | |
| 1809 fprintf(debugf, "%c", ' '); | |
| 1810 | |
| 1811 nfa_set_code(state->c); | |
| 1812 fprintf(debugf, "%s %s (%d) (id=%d)\n", | |
| 1813 state->negated ? "NOT" : "", code, state->c, abs(state->id)); | |
| 1814 if (state->id < 0) | |
| 1815 return; | |
| 1816 | |
| 1817 state->id = abs(state->id) * -1; | |
| 1818 nfa_print_state(debugf, state->out, ident + 4); | |
| 1819 nfa_print_state(debugf, state->out1, ident + 4); | |
| 1820 } | |
| 1821 | |
| 1822 /* | |
| 1823 * Print the NFA state machine. | |
| 1824 */ | |
| 1825 static void | |
| 1826 nfa_dump(prog) | |
| 1827 nfa_regprog_T *prog; | |
| 1828 { | |
| 1829 FILE *debugf = fopen("LOG.log", "a"); | |
| 1830 | |
| 1831 if (debugf != NULL) | |
| 1832 { | |
| 1833 nfa_print_state(debugf, prog->start, 0); | |
| 1834 fclose(debugf); | |
| 1835 } | |
| 1836 } | |
| 1837 #endif /* ENABLE_LOG */ | |
| 1838 #endif /* DEBUG */ | |
| 1839 | |
| 1840 /* | |
| 1841 * Parse r.e. @expr and convert it into postfix form. | |
| 1842 * Return the postfix string on success, NULL otherwise. | |
| 1843 */ | |
| 1844 static int * | |
| 1845 re2post() | |
| 1846 { | |
| 1847 if (nfa_reg(REG_NOPAREN) == FAIL) | |
| 1848 return NULL; | |
| 1849 EMIT(NFA_MOPEN); | |
| 1850 return post_start; | |
| 1851 } | |
| 1852 | |
| 1853 /* NB. Some of the code below is inspired by Russ's. */ | |
| 1854 | |
| 1855 /* | |
| 1856 * Represents an NFA state plus zero or one or two arrows exiting. | |
| 1857 * if c == MATCH, no arrows out; matching state. | |
| 1858 * If c == SPLIT, unlabeled arrows to out and out1 (if != NULL). | |
| 1859 * If c < 256, labeled arrow with character c to out. | |
| 1860 */ | |
| 1861 | |
| 1862 static nfa_state_T *state_ptr; /* points to nfa_prog->state */ | |
| 1863 | |
| 1864 /* | |
| 1865 * Allocate and initialize nfa_state_T. | |
| 1866 */ | |
| 1867 static nfa_state_T * | |
| 1868 new_state(c, out, out1) | |
| 1869 int c; | |
| 1870 nfa_state_T *out; | |
| 1871 nfa_state_T *out1; | |
| 1872 { | |
| 1873 nfa_state_T *s; | |
| 1874 | |
| 1875 if (istate >= nstate) | |
| 1876 return NULL; | |
| 1877 | |
| 1878 s = &state_ptr[istate++]; | |
| 1879 | |
| 1880 s->c = c; | |
| 1881 s->out = out; | |
| 1882 s->out1 = out1; | |
| 1883 | |
| 1884 s->id = istate; | |
| 1885 s->lastlist = 0; | |
| 1886 s->lastthread = NULL; | |
| 1887 s->visits = 0; | |
| 1888 s->negated = FALSE; | |
| 1889 | |
| 1890 return s; | |
| 1891 } | |
| 1892 | |
| 1893 /* | |
| 1894 * A partially built NFA without the matching state filled in. | |
| 1895 * Frag_T.start points at the start state. | |
| 1896 * Frag_T.out is a list of places that need to be set to the | |
| 1897 * next state for this fragment. | |
| 1898 */ | |
| 1899 typedef union Ptrlist Ptrlist; | |
| 1900 struct Frag | |
| 1901 { | |
| 1902 nfa_state_T *start; | |
| 1903 Ptrlist *out; | |
| 1904 }; | |
| 1905 typedef struct Frag Frag_T; | |
| 1906 | |
| 1907 static Frag_T frag __ARGS((nfa_state_T *start, Ptrlist *out)); | |
| 1908 static Ptrlist *list1 __ARGS((nfa_state_T **outp)); | |
| 1909 static void patch __ARGS((Ptrlist *l, nfa_state_T *s)); | |
| 1910 static Ptrlist *append __ARGS((Ptrlist *l1, Ptrlist *l2)); | |
| 1911 static void st_push __ARGS((Frag_T s, Frag_T **p, Frag_T *stack_end)); | |
| 1912 static Frag_T st_pop __ARGS((Frag_T **p, Frag_T *stack)); | |
| 1913 | |
| 1914 /* | |
| 4456 | 1915 * Initialize a Frag_T struct and return it. |
| 4444 | 1916 */ |
| 1917 static Frag_T | |
| 1918 frag(start, out) | |
| 1919 nfa_state_T *start; | |
| 1920 Ptrlist *out; | |
| 1921 { | |
| 4456 | 1922 Frag_T n; |
| 1923 | |
| 1924 n.start = start; | |
| 1925 n.out = out; | |
| 4444 | 1926 return n; |
| 1927 } | |
| 1928 | |
| 1929 /* | |
| 1930 * Since the out pointers in the list are always | |
| 1931 * uninitialized, we use the pointers themselves | |
| 1932 * as storage for the Ptrlists. | |
| 1933 */ | |
| 1934 union Ptrlist | |
| 1935 { | |
| 1936 Ptrlist *next; | |
| 1937 nfa_state_T *s; | |
| 1938 }; | |
| 1939 | |
| 1940 /* | |
| 1941 * Create singleton list containing just outp. | |
| 1942 */ | |
| 1943 static Ptrlist * | |
| 1944 list1(outp) | |
| 1945 nfa_state_T **outp; | |
| 1946 { | |
| 1947 Ptrlist *l; | |
| 1948 | |
| 1949 l = (Ptrlist *)outp; | |
| 1950 l->next = NULL; | |
| 1951 return l; | |
| 1952 } | |
| 1953 | |
| 1954 /* | |
| 1955 * Patch the list of states at out to point to start. | |
| 1956 */ | |
| 1957 static void | |
| 1958 patch(l, s) | |
| 1959 Ptrlist *l; | |
| 1960 nfa_state_T *s; | |
| 1961 { | |
| 1962 Ptrlist *next; | |
| 1963 | |
| 1964 for (; l; l = next) | |
| 1965 { | |
| 1966 next = l->next; | |
| 1967 l->s = s; | |
| 1968 } | |
| 1969 } | |
| 1970 | |
| 1971 | |
| 1972 /* | |
| 1973 * Join the two lists l1 and l2, returning the combination. | |
| 1974 */ | |
| 1975 static Ptrlist * | |
| 1976 append(l1, l2) | |
| 1977 Ptrlist *l1; | |
| 1978 Ptrlist *l2; | |
| 1979 { | |
| 1980 Ptrlist *oldl1; | |
| 1981 | |
| 1982 oldl1 = l1; | |
| 1983 while (l1->next) | |
| 1984 l1 = l1->next; | |
| 1985 l1->next = l2; | |
| 1986 return oldl1; | |
| 1987 } | |
| 1988 | |
| 1989 /* | |
| 1990 * Stack used for transforming postfix form into NFA. | |
| 1991 */ | |
| 1992 static Frag_T empty; | |
| 1993 | |
| 1994 static void | |
| 1995 st_error(postfix, end, p) | |
| 1996 int *postfix; | |
| 1997 int *end; | |
| 1998 int *p; | |
| 1999 { | |
| 2000 FILE *df; | |
| 2001 int *p2; | |
| 2002 | |
| 2003 df = fopen("stack.err", "a"); | |
| 2004 if (df) | |
| 2005 { | |
| 2006 fprintf(df, "Error popping the stack!\n"); | |
| 2007 #ifdef DEBUG | |
| 2008 fprintf(df, "Current regexp is \"%s\"\n", nfa_regengine.expr); | |
| 2009 #endif | |
| 2010 fprintf(df, "Postfix form is: "); | |
| 2011 #ifdef DEBUG | |
| 2012 for (p2 = postfix; p2 < end; p2++) | |
| 2013 { | |
| 2014 nfa_set_code(*p2); | |
| 2015 fprintf(df, "%s, ", code); | |
| 2016 } | |
| 2017 nfa_set_code(*p); | |
| 2018 fprintf(df, "\nCurrent position is: "); | |
| 2019 for (p2 = postfix; p2 <= p; p2 ++) | |
| 2020 { | |
| 2021 nfa_set_code(*p2); | |
| 2022 fprintf(df, "%s, ", code); | |
| 2023 } | |
| 2024 #else | |
| 2025 for (p2 = postfix; p2 < end; p2++) | |
| 2026 { | |
| 2027 fprintf(df, "%d, ", *p2); | |
| 2028 } | |
| 2029 fprintf(df, "\nCurrent position is: "); | |
| 2030 for (p2 = postfix; p2 <= p; p2 ++) | |
| 2031 { | |
| 2032 fprintf(df, "%d, ", *p2); | |
| 2033 } | |
| 2034 #endif | |
| 2035 fprintf(df, "\n--------------------------\n"); | |
| 2036 fclose(df); | |
| 2037 } | |
| 2038 EMSG(_("E874: (NFA) Could not pop the stack !")); | |
| 2039 } | |
| 2040 | |
| 2041 /* | |
| 2042 * Push an item onto the stack. | |
| 2043 */ | |
| 2044 static void | |
| 2045 st_push(s, p, stack_end) | |
| 2046 Frag_T s; | |
| 2047 Frag_T **p; | |
| 2048 Frag_T *stack_end; | |
| 2049 { | |
| 2050 Frag_T *stackp = *p; | |
| 2051 | |
| 2052 if (stackp >= stack_end) | |
| 2053 return; | |
| 2054 *stackp = s; | |
| 2055 *p = *p + 1; | |
| 2056 } | |
| 2057 | |
| 2058 /* | |
| 2059 * Pop an item from the stack. | |
| 2060 */ | |
| 2061 static Frag_T | |
| 2062 st_pop(p, stack) | |
| 2063 Frag_T **p; | |
| 2064 Frag_T *stack; | |
| 2065 { | |
| 2066 Frag_T *stackp; | |
| 2067 | |
| 2068 *p = *p - 1; | |
| 2069 stackp = *p; | |
| 2070 if (stackp < stack) | |
| 2071 return empty; | |
| 2072 return **p; | |
| 2073 } | |
| 2074 | |
| 2075 /* | |
| 2076 * Convert a postfix form into its equivalent NFA. | |
| 2077 * Return the NFA start state on success, NULL otherwise. | |
| 2078 */ | |
| 2079 static nfa_state_T * | |
| 2080 post2nfa(postfix, end, nfa_calc_size) | |
| 2081 int *postfix; | |
| 2082 int *end; | |
| 2083 int nfa_calc_size; | |
| 2084 { | |
| 2085 int *p; | |
| 2086 int mopen; | |
| 2087 int mclose; | |
| 2088 Frag_T *stack = NULL; | |
| 2089 Frag_T *stackp = NULL; | |
| 2090 Frag_T *stack_end = NULL; | |
| 2091 Frag_T e1; | |
| 2092 Frag_T e2; | |
| 2093 Frag_T e; | |
| 2094 nfa_state_T *s; | |
| 2095 nfa_state_T *s1; | |
| 2096 nfa_state_T *matchstate; | |
| 4484 | 2097 nfa_state_T *ret = NULL; |
| 4444 | 2098 |
| 2099 if (postfix == NULL) | |
| 2100 return NULL; | |
| 2101 | |
| 4456 | 2102 #define PUSH(s) st_push((s), &stackp, stack_end) |
| 4444 | 2103 #define POP() st_pop(&stackp, stack); \ |
| 2104 if (stackp < stack) \ | |
| 2105 { \ | |
| 2106 st_error(postfix, end, p); \ | |
| 2107 return NULL; \ | |
| 2108 } | |
| 2109 | |
| 2110 if (nfa_calc_size == FALSE) | |
| 2111 { | |
| 2112 /* Allocate space for the stack. Max states on the stack : nstate */ | |
| 4462 | 2113 stack = (Frag_T *) lalloc((nstate + 1) * sizeof(Frag_T), TRUE); |
| 4444 | 2114 stackp = stack; |
| 4462 | 2115 stack_end = stack + (nstate + 1); |
| 4444 | 2116 } |
| 2117 | |
| 2118 for (p = postfix; p < end; ++p) | |
| 2119 { | |
| 2120 switch (*p) | |
| 2121 { | |
| 2122 case NFA_CONCAT: | |
| 2123 /* Catenation. | |
| 2124 * Pay attention: this operator does not exist | |
| 2125 * in the r.e. itself (it is implicit, really). | |
| 2126 * It is added when r.e. is translated to postfix | |
| 2127 * form in re2post(). | |
| 2128 * | |
| 2129 * No new state added here. */ | |
| 2130 if (nfa_calc_size == TRUE) | |
| 2131 { | |
| 4458 | 2132 /* nstate += 0; */ |
| 4444 | 2133 break; |
| 2134 } | |
| 2135 e2 = POP(); | |
| 2136 e1 = POP(); | |
| 2137 patch(e1.out, e2.start); | |
| 2138 PUSH(frag(e1.start, e2.out)); | |
| 2139 break; | |
| 2140 | |
| 2141 case NFA_NOT: | |
| 2142 /* Negation of a character */ | |
| 2143 if (nfa_calc_size == TRUE) | |
| 2144 { | |
| 4458 | 2145 /* nstate += 0; */ |
| 4444 | 2146 break; |
| 2147 } | |
| 2148 e1 = POP(); | |
| 2149 e1.start->negated = TRUE; | |
|
4527
55bcaa1d2749
updated for version 7.3.1011
Bram Moolenaar <bram@vim.org>
parents:
4525
diff
changeset
|
2150 if (e1.start->c == NFA_COMPOSING) |
| 4444 | 2151 e1.start->out1->negated = TRUE; |
| 2152 PUSH(e1); | |
| 2153 break; | |
| 2154 | |
| 2155 case NFA_OR: | |
| 2156 /* Alternation */ | |
| 2157 if (nfa_calc_size == TRUE) | |
| 2158 { | |
| 4458 | 2159 nstate++; |
| 4444 | 2160 break; |
| 2161 } | |
| 2162 e2 = POP(); | |
| 2163 e1 = POP(); | |
| 2164 s = new_state(NFA_SPLIT, e1.start, e2.start); | |
| 2165 if (s == NULL) | |
| 4484 | 2166 goto theend; |
| 4444 | 2167 PUSH(frag(s, append(e1.out, e2.out))); |
| 2168 break; | |
| 2169 | |
| 2170 case NFA_STAR: | |
| 2171 /* Zero or more */ | |
| 2172 if (nfa_calc_size == TRUE) | |
| 2173 { | |
| 4458 | 2174 nstate++; |
| 4444 | 2175 break; |
| 2176 } | |
| 2177 e = POP(); | |
| 2178 s = new_state(NFA_SPLIT, e.start, NULL); | |
| 2179 if (s == NULL) | |
| 4484 | 2180 goto theend; |
| 4444 | 2181 patch(e.out, s); |
| 2182 PUSH(frag(s, list1(&s->out1))); | |
| 2183 break; | |
| 2184 | |
| 2185 case NFA_QUEST: | |
| 2186 /* one or zero atoms=> greedy match */ | |
| 2187 if (nfa_calc_size == TRUE) | |
| 2188 { | |
| 4458 | 2189 nstate++; |
| 4444 | 2190 break; |
| 2191 } | |
| 2192 e = POP(); | |
| 2193 s = new_state(NFA_SPLIT, e.start, NULL); | |
| 2194 if (s == NULL) | |
| 4484 | 2195 goto theend; |
| 4444 | 2196 PUSH(frag(s, append(e.out, list1(&s->out1)))); |
| 2197 break; | |
| 2198 | |
| 2199 case NFA_QUEST_NONGREEDY: | |
| 2200 /* zero or one atoms => non-greedy match */ | |
| 2201 if (nfa_calc_size == TRUE) | |
| 2202 { | |
| 4458 | 2203 nstate++; |
| 4444 | 2204 break; |
| 2205 } | |
| 2206 e = POP(); | |
| 2207 s = new_state(NFA_SPLIT, NULL, e.start); | |
| 2208 if (s == NULL) | |
| 4484 | 2209 goto theend; |
| 4444 | 2210 PUSH(frag(s, append(e.out, list1(&s->out)))); |
| 2211 break; | |
| 2212 | |
| 2213 case NFA_PLUS: | |
| 2214 /* One or more */ | |
| 2215 if (nfa_calc_size == TRUE) | |
| 2216 { | |
| 4458 | 2217 nstate++; |
| 4444 | 2218 break; |
| 2219 } | |
| 2220 e = POP(); | |
| 2221 s = new_state(NFA_SPLIT, e.start, NULL); | |
| 2222 if (s == NULL) | |
| 4484 | 2223 goto theend; |
| 4444 | 2224 patch(e.out, s); |
| 2225 PUSH(frag(e.start, list1(&s->out1))); | |
| 2226 break; | |
| 2227 | |
| 2228 case NFA_SKIP_CHAR: | |
| 2229 /* Symbol of 0-length, Used in a repetition | |
| 2230 * with max/min count of 0 */ | |
| 2231 if (nfa_calc_size == TRUE) | |
| 2232 { | |
| 4458 | 2233 nstate++; |
| 4444 | 2234 break; |
| 2235 } | |
| 2236 s = new_state(NFA_SKIP_CHAR, NULL, NULL); | |
| 2237 if (s == NULL) | |
| 4484 | 2238 goto theend; |
| 4444 | 2239 PUSH(frag(s, list1(&s->out))); |
| 2240 break; | |
| 2241 | |
| 2242 case NFA_PREV_ATOM_NO_WIDTH: | |
| 2243 /* The \@= operator: match the preceding atom with 0 width. | |
| 2244 * Surrounds the preceding atom with START_INVISIBLE and | |
| 2245 * END_INVISIBLE, similarly to MOPEN. | |
| 2246 */ | |
| 2247 /* TODO: Maybe this drops the speed? */ | |
| 4484 | 2248 goto theend; |
| 4444 | 2249 |
| 2250 if (nfa_calc_size == TRUE) | |
| 2251 { | |
| 2252 nstate += 2; | |
| 2253 break; | |
| 2254 } | |
| 2255 e = POP(); | |
| 2256 s1 = new_state(NFA_END_INVISIBLE, NULL, NULL); | |
| 2257 if (s1 == NULL) | |
| 4484 | 2258 goto theend; |
| 4444 | 2259 patch(e.out, s1); |
| 2260 | |
| 2261 s = new_state(NFA_START_INVISIBLE, e.start, s1); | |
| 2262 if (s == NULL) | |
| 4484 | 2263 goto theend; |
| 4444 | 2264 PUSH(frag(s, list1(&s1->out))); |
| 2265 break; | |
| 2266 | |
|
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2267 case NFA_COMPOSING: /* char with composing char */ |
|
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2268 #if 0 |
|
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2269 /* TODO */ |
|
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2270 if (regflags & RF_ICOMBINE) |
|
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2271 { |
|
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2272 goto normalchar; |
|
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|
2273 } |
|
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|
2274 #endif |
|
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|
2275 /* FALLTHROUGH */ |
|
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|
2276 |
| 4444 | 2277 case NFA_MOPEN + 0: /* Submatch */ |
| 2278 case NFA_MOPEN + 1: | |
| 2279 case NFA_MOPEN + 2: | |
| 2280 case NFA_MOPEN + 3: | |
| 2281 case NFA_MOPEN + 4: | |
| 2282 case NFA_MOPEN + 5: | |
| 2283 case NFA_MOPEN + 6: | |
| 2284 case NFA_MOPEN + 7: | |
| 2285 case NFA_MOPEN + 8: | |
| 2286 case NFA_MOPEN + 9: | |
| 2287 case NFA_NOPEN: /* \%( "Invisible Submatch" */ | |
| 2288 if (nfa_calc_size == TRUE) | |
| 2289 { | |
| 2290 nstate += 2; | |
| 2291 break; | |
| 2292 } | |
| 2293 | |
| 2294 mopen = *p; | |
| 2295 switch (*p) | |
| 2296 { | |
| 2297 case NFA_NOPEN: | |
| 2298 mclose = NFA_NCLOSE; | |
| 2299 break; | |
| 2300 case NFA_COMPOSING: | |
| 2301 mclose = NFA_END_COMPOSING; | |
| 2302 break; | |
| 2303 default: | |
| 2304 /* NFA_MOPEN(0) ... NFA_MOPEN(9) */ | |
| 2305 mclose = *p + NSUBEXP; | |
| 2306 break; | |
| 2307 } | |
| 2308 | |
| 2309 /* Allow "NFA_MOPEN" as a valid postfix representation for | |
| 2310 * the empty regexp "". In this case, the NFA will be | |
| 2311 * NFA_MOPEN -> NFA_MCLOSE. Note that this also allows | |
| 2312 * empty groups of parenthesis, and empty mbyte chars */ | |
| 2313 if (stackp == stack) | |
| 2314 { | |
| 2315 s = new_state(mopen, NULL, NULL); | |
| 2316 if (s == NULL) | |
| 4484 | 2317 goto theend; |
| 4444 | 2318 s1 = new_state(mclose, NULL, NULL); |
| 2319 if (s1 == NULL) | |
| 4484 | 2320 goto theend; |
| 4444 | 2321 patch(list1(&s->out), s1); |
| 2322 PUSH(frag(s, list1(&s1->out))); | |
| 2323 break; | |
| 2324 } | |
| 2325 | |
| 2326 /* At least one node was emitted before NFA_MOPEN, so | |
| 2327 * at least one node will be between NFA_MOPEN and NFA_MCLOSE */ | |
| 2328 e = POP(); | |
| 2329 s = new_state(mopen, e.start, NULL); /* `(' */ | |
| 2330 if (s == NULL) | |
| 4484 | 2331 goto theend; |
| 4444 | 2332 |
| 2333 s1 = new_state(mclose, NULL, NULL); /* `)' */ | |
| 2334 if (s1 == NULL) | |
| 4484 | 2335 goto theend; |
| 4444 | 2336 patch(e.out, s1); |
| 2337 | |
|
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|
2338 if (mopen == NFA_COMPOSING) |
|
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|
2339 /* COMPOSING->out1 = END_COMPOSING */ |
| 4444 | 2340 patch(list1(&s->out1), s1); |
| 2341 | |
| 2342 PUSH(frag(s, list1(&s1->out))); | |
| 2343 break; | |
| 2344 | |
| 2345 case NFA_ZSTART: | |
| 2346 case NFA_ZEND: | |
| 2347 default: | |
| 2348 /* Operands */ | |
| 2349 if (nfa_calc_size == TRUE) | |
| 2350 { | |
| 4458 | 2351 nstate++; |
| 4444 | 2352 break; |
| 2353 } | |
| 2354 s = new_state(*p, NULL, NULL); | |
| 2355 if (s == NULL) | |
| 4484 | 2356 goto theend; |
| 4444 | 2357 PUSH(frag(s, list1(&s->out))); |
| 2358 break; | |
| 2359 | |
| 2360 } /* switch(*p) */ | |
| 2361 | |
| 2362 } /* for(p = postfix; *p; ++p) */ | |
| 2363 | |
| 2364 if (nfa_calc_size == TRUE) | |
| 2365 { | |
| 4458 | 2366 nstate++; |
| 4484 | 2367 goto theend; /* Return value when counting size is ignored anyway */ |
| 4444 | 2368 } |
| 2369 | |
| 2370 e = POP(); | |
| 2371 if (stackp != stack) | |
| 2372 EMSG_RET_NULL(_("E875: (NFA regexp) (While converting from postfix to NFA), too many states left on stack")); | |
| 2373 | |
| 2374 if (istate >= nstate) | |
| 2375 EMSG_RET_NULL(_("E876: (NFA regexp) Not enough space to store the whole NFA ")); | |
| 2376 | |
| 2377 matchstate = &state_ptr[istate++]; /* the match state */ | |
| 2378 matchstate->c = NFA_MATCH; | |
| 2379 matchstate->out = matchstate->out1 = NULL; | |
| 2380 | |
| 2381 patch(e.out, matchstate); | |
| 4484 | 2382 ret = e.start; |
| 2383 | |
| 2384 theend: | |
| 2385 vim_free(stack); | |
| 2386 return ret; | |
| 4444 | 2387 |
| 2388 #undef POP1 | |
| 2389 #undef PUSH1 | |
| 2390 #undef POP2 | |
| 2391 #undef PUSH2 | |
| 2392 #undef POP | |
| 2393 #undef PUSH | |
| 2394 } | |
| 2395 | |
| 2396 /**************************************************************** | |
| 2397 * NFA execution code. | |
| 2398 ****************************************************************/ | |
| 2399 | |
| 2400 /* thread_T contains runtime information of a NFA state */ | |
| 2401 struct thread | |
| 2402 { | |
| 2403 nfa_state_T *state; | |
| 2404 regsub_T sub; /* submatch info */ | |
| 2405 }; | |
| 2406 | |
| 2407 typedef struct | |
| 2408 { | |
| 2409 thread_T *t; | |
| 2410 int n; | |
| 2411 } List; | |
| 2412 | |
| 2413 static void addstate __ARGS((List *l, nfa_state_T *state, regsub_T *m, int off, int lid, int *match)); | |
| 2414 | |
| 2415 static void | |
| 2416 addstate(l, state, m, off, lid, match) | |
| 2417 List *l; /* runtime state list */ | |
| 2418 nfa_state_T *state; /* state to update */ | |
| 2419 regsub_T *m; /* pointers to subexpressions */ | |
|
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|
2420 int off; /* byte offset, when -1 go to next line */ |
| 4444 | 2421 int lid; |
| 2422 int *match; /* found match? */ | |
| 2423 { | |
| 2424 regsub_T save; | |
| 2425 int subidx = 0; | |
| 2426 | |
| 2427 if (l == NULL || state == NULL) | |
| 2428 return; | |
| 2429 | |
| 2430 switch (state->c) | |
| 2431 { | |
| 2432 case NFA_SPLIT: | |
| 2433 case NFA_NOT: | |
| 2434 case NFA_NOPEN: | |
| 2435 case NFA_NCLOSE: | |
| 2436 case NFA_MCLOSE: | |
| 2437 case NFA_MCLOSE + 1: | |
| 2438 case NFA_MCLOSE + 2: | |
| 2439 case NFA_MCLOSE + 3: | |
| 2440 case NFA_MCLOSE + 4: | |
| 2441 case NFA_MCLOSE + 5: | |
| 2442 case NFA_MCLOSE + 6: | |
| 2443 case NFA_MCLOSE + 7: | |
| 2444 case NFA_MCLOSE + 8: | |
| 2445 case NFA_MCLOSE + 9: | |
| 2446 /* Do not remember these nodes in list "thislist" or "nextlist" */ | |
| 2447 break; | |
| 2448 | |
| 2449 default: | |
| 2450 if (state->lastlist == lid) | |
| 2451 { | |
| 2452 if (++state->visits > 2) | |
| 2453 return; | |
| 2454 } | |
| 2455 else | |
| 2456 { | |
| 2457 /* add the state to the list */ | |
| 2458 state->lastlist = lid; | |
| 2459 state->lastthread = &l->t[l->n++]; | |
| 2460 state->lastthread->state = state; | |
| 2461 state->lastthread->sub = *m; | |
| 2462 } | |
| 2463 } | |
| 2464 | |
| 2465 #ifdef ENABLE_LOG | |
| 2466 nfa_set_code(state->c); | |
| 2467 fprintf(log_fd, "> Adding state %d to list. Character %s, code %d\n", | |
| 2468 abs(state->id), code, state->c); | |
| 2469 #endif | |
| 2470 switch (state->c) | |
| 2471 { | |
| 2472 case NFA_MATCH: | |
| 2473 *match = TRUE; | |
| 2474 break; | |
| 2475 | |
| 2476 case NFA_SPLIT: | |
| 2477 addstate(l, state->out, m, off, lid, match); | |
| 2478 addstate(l, state->out1, m, off, lid, match); | |
| 2479 break; | |
| 2480 | |
| 2481 case NFA_SKIP_CHAR: | |
| 2482 addstate(l, state->out, m, off, lid, match); | |
| 2483 break; | |
| 2484 | |
| 2485 #if 0 | |
| 2486 case NFA_END_NEG_RANGE: | |
| 2487 /* Nothing to handle here. nfa_regmatch() will take care of it */ | |
| 2488 break; | |
| 2489 | |
| 2490 case NFA_NOT: | |
| 2491 EMSG(_("E999: (NFA regexp internal error) Should not process NOT node !")); | |
| 2492 #ifdef ENABLE_LOG | |
| 2493 fprintf(f, "\n\n>>> E999: Added state NFA_NOT to a list ... Something went wrong ! Why wasn't it processed already? \n\n"); | |
| 2494 #endif | |
| 2495 break; | |
| 2496 | |
| 2497 case NFA_COMPOSING: | |
| 2498 /* nfa_regmatch() will match all the bytes of this composing char. */ | |
| 2499 break; | |
| 2500 #endif | |
| 2501 | |
| 2502 case NFA_NOPEN: | |
| 2503 case NFA_NCLOSE: | |
| 2504 addstate(l, state->out, m, off, lid, match); | |
| 2505 break; | |
| 2506 | |
| 2507 /* If this state is reached, then a recursive call of nfa_regmatch() | |
| 2508 * succeeded. the next call saves the found submatches in the | |
| 2509 * first state after the "invisible" branch. */ | |
| 2510 #if 0 | |
| 2511 case NFA_END_INVISIBLE: | |
| 2512 break; | |
| 2513 #endif | |
| 2514 | |
| 2515 case NFA_MOPEN + 0: | |
| 2516 case NFA_MOPEN + 1: | |
| 2517 case NFA_MOPEN + 2: | |
| 2518 case NFA_MOPEN + 3: | |
| 2519 case NFA_MOPEN + 4: | |
| 2520 case NFA_MOPEN + 5: | |
| 2521 case NFA_MOPEN + 6: | |
| 2522 case NFA_MOPEN + 7: | |
| 2523 case NFA_MOPEN + 8: | |
| 2524 case NFA_MOPEN + 9: | |
| 2525 case NFA_ZSTART: | |
| 2526 subidx = state->c - NFA_MOPEN; | |
| 2527 if (state->c == NFA_ZSTART) | |
| 2528 subidx = 0; | |
| 2529 | |
| 2530 if (REG_MULTI) | |
| 2531 { | |
| 2532 save.startpos[subidx] = m->startpos[subidx]; | |
| 2533 save.endpos[subidx] = m->endpos[subidx]; | |
|
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2534 if (off == -1) |
|
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|
2535 { |
|
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|
2536 m->startpos[subidx].lnum = reglnum + 1; |
|
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2537 m->startpos[subidx].col = 0; |
|
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|
2538 } |
|
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|
2539 else |
|
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2540 { |
|
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|
2541 m->startpos[subidx].lnum = reglnum; |
|
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|
2542 m->startpos[subidx].col = |
|
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|
2543 (colnr_T)(reginput - regline + off); |
|
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|
2544 } |
| 4444 | 2545 } |
| 2546 else | |
| 2547 { | |
| 2548 save.start[subidx] = m->start[subidx]; | |
| 2549 save.end[subidx] = m->end[subidx]; | |
| 2550 m->start[subidx] = reginput + off; | |
| 2551 } | |
| 2552 | |
| 2553 addstate(l, state->out, m, off, lid, match); | |
| 2554 | |
| 2555 if (REG_MULTI) | |
| 2556 { | |
| 2557 m->startpos[subidx] = save.startpos[subidx]; | |
| 2558 m->endpos[subidx] = save.endpos[subidx]; | |
| 2559 } | |
| 2560 else | |
| 2561 { | |
| 2562 m->start[subidx] = save.start[subidx]; | |
| 2563 m->end[subidx] = save.end[subidx]; | |
| 2564 } | |
| 2565 break; | |
| 2566 | |
| 2567 case NFA_MCLOSE + 0: | |
| 2568 if (nfa_has_zend == TRUE) | |
| 2569 { | |
| 2570 addstate(l, state->out, m, off, lid, match); | |
| 2571 break; | |
| 2572 } | |
| 2573 case NFA_MCLOSE + 1: | |
| 2574 case NFA_MCLOSE + 2: | |
| 2575 case NFA_MCLOSE + 3: | |
| 2576 case NFA_MCLOSE + 4: | |
| 2577 case NFA_MCLOSE + 5: | |
| 2578 case NFA_MCLOSE + 6: | |
| 2579 case NFA_MCLOSE + 7: | |
| 2580 case NFA_MCLOSE + 8: | |
| 2581 case NFA_MCLOSE + 9: | |
| 2582 case NFA_ZEND: | |
| 2583 subidx = state->c - NFA_MCLOSE; | |
| 2584 if (state->c == NFA_ZEND) | |
| 2585 subidx = 0; | |
| 2586 | |
| 2587 if (REG_MULTI) | |
| 2588 { | |
| 2589 save.startpos[subidx] = m->startpos[subidx]; | |
| 2590 save.endpos[subidx] = m->endpos[subidx]; | |
|
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2591 if (off == -1) |
|
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2592 { |
|
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2593 m->endpos[subidx].lnum = reglnum + 1; |
|
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2594 m->endpos[subidx].col = 0; |
|
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2595 } |
|
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2596 else |
|
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2597 { |
|
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2598 m->endpos[subidx].lnum = reglnum; |
|
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|
2599 m->endpos[subidx].col = (colnr_T)(reginput - regline + off); |
|
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|
2600 } |
| 4444 | 2601 } |
| 2602 else | |
| 2603 { | |
| 2604 save.start[subidx] = m->start[subidx]; | |
| 2605 save.end[subidx] = m->end[subidx]; | |
| 2606 m->end[subidx] = reginput + off; | |
| 2607 } | |
| 2608 | |
| 2609 addstate(l, state->out, m, off, lid, match); | |
| 2610 | |
| 2611 if (REG_MULTI) | |
| 2612 { | |
| 2613 m->startpos[subidx] = save.startpos[subidx]; | |
| 2614 m->endpos[subidx] = save.endpos[subidx]; | |
| 2615 } | |
| 2616 else | |
| 2617 { | |
| 2618 m->start[subidx] = save.start[subidx]; | |
| 2619 m->end[subidx] = save.end[subidx]; | |
| 2620 } | |
| 2621 break; | |
| 2622 } | |
| 2623 } | |
| 2624 | |
| 2625 /* | |
| 2626 * Check character class "class" against current character c. | |
| 2627 */ | |
| 2628 static int | |
| 2629 check_char_class(class, c) | |
| 2630 int class; | |
| 2631 int c; | |
| 2632 { | |
| 2633 switch (class) | |
| 2634 { | |
| 2635 case NFA_CLASS_ALNUM: | |
| 4464 | 2636 if (c >= 1 && c <= 255 && isalnum(c)) |
| 4444 | 2637 return OK; |
| 2638 break; | |
| 2639 case NFA_CLASS_ALPHA: | |
| 4464 | 2640 if (c >= 1 && c <= 255 && isalpha(c)) |
| 4444 | 2641 return OK; |
| 2642 break; | |
| 2643 case NFA_CLASS_BLANK: | |
| 2644 if (c == ' ' || c == '\t') | |
| 2645 return OK; | |
| 2646 break; | |
| 2647 case NFA_CLASS_CNTRL: | |
| 4464 | 2648 if (c >= 1 && c <= 255 && iscntrl(c)) |
| 4444 | 2649 return OK; |
| 2650 break; | |
| 2651 case NFA_CLASS_DIGIT: | |
| 2652 if (VIM_ISDIGIT(c)) | |
| 2653 return OK; | |
| 2654 break; | |
| 2655 case NFA_CLASS_GRAPH: | |
| 4464 | 2656 if (c >= 1 && c <= 255 && isgraph(c)) |
| 4444 | 2657 return OK; |
| 2658 break; | |
| 2659 case NFA_CLASS_LOWER: | |
| 2660 if (MB_ISLOWER(c)) | |
| 2661 return OK; | |
| 2662 break; | |
| 2663 case NFA_CLASS_PRINT: | |
| 2664 if (vim_isprintc(c)) | |
| 2665 return OK; | |
| 2666 break; | |
| 2667 case NFA_CLASS_PUNCT: | |
| 4464 | 2668 if (c >= 1 && c <= 255 && ispunct(c)) |
| 4444 | 2669 return OK; |
| 2670 break; | |
| 2671 case NFA_CLASS_SPACE: | |
| 2672 if ((c >=9 && c <= 13) || (c == ' ')) | |
| 2673 return OK; | |
| 2674 break; | |
| 2675 case NFA_CLASS_UPPER: | |
| 2676 if (MB_ISUPPER(c)) | |
| 2677 return OK; | |
| 2678 break; | |
| 2679 case NFA_CLASS_XDIGIT: | |
| 2680 if (vim_isxdigit(c)) | |
| 2681 return OK; | |
| 2682 break; | |
| 2683 case NFA_CLASS_TAB: | |
| 2684 if (c == '\t') | |
| 2685 return OK; | |
| 2686 break; | |
| 2687 case NFA_CLASS_RETURN: | |
| 2688 if (c == '\r') | |
| 2689 return OK; | |
| 2690 break; | |
| 2691 case NFA_CLASS_BACKSPACE: | |
| 2692 if (c == '\b') | |
| 2693 return OK; | |
| 2694 break; | |
| 2695 case NFA_CLASS_ESCAPE: | |
| 2696 if (c == '\033') | |
| 2697 return OK; | |
| 2698 break; | |
| 2699 | |
| 2700 default: | |
| 2701 /* should not be here :P */ | |
| 2702 EMSG_RET_FAIL(_("E877: (NFA regexp) Invalid character class ")); | |
| 2703 } | |
| 2704 return FAIL; | |
| 2705 } | |
| 2706 | |
| 2707 /* | |
| 2708 * Set all NFA nodes' list ID equal to -1. | |
| 2709 */ | |
| 2710 static void | |
| 2711 nfa_set_neg_listids(start) | |
| 2712 nfa_state_T *start; | |
| 2713 { | |
| 2714 if (start == NULL) | |
| 2715 return; | |
| 2716 if (start->lastlist >= 0) | |
| 2717 { | |
| 2718 start->lastlist = -1; | |
| 2719 nfa_set_neg_listids(start->out); | |
| 2720 nfa_set_neg_listids(start->out1); | |
| 2721 } | |
| 2722 } | |
| 2723 | |
| 2724 /* | |
| 2725 * Set all NFA nodes' list ID equal to 0. | |
| 2726 */ | |
| 2727 static void | |
| 2728 nfa_set_null_listids(start) | |
| 2729 nfa_state_T *start; | |
| 2730 { | |
| 2731 if (start == NULL) | |
| 2732 return; | |
| 2733 if (start->lastlist == -1) | |
| 2734 { | |
| 2735 start->lastlist = 0; | |
| 2736 nfa_set_null_listids(start->out); | |
| 2737 nfa_set_null_listids(start->out1); | |
| 2738 } | |
| 2739 } | |
| 2740 | |
| 2741 /* | |
| 2742 * Save list IDs for all NFA states in "list". | |
| 2743 */ | |
| 2744 static void | |
| 2745 nfa_save_listids(start, list) | |
| 2746 nfa_state_T *start; | |
| 2747 int *list; | |
| 2748 { | |
| 2749 if (start == NULL) | |
| 2750 return; | |
| 2751 if (start->lastlist != -1) | |
| 2752 { | |
| 2753 list[abs(start->id)] = start->lastlist; | |
| 2754 start->lastlist = -1; | |
| 2755 nfa_save_listids(start->out, list); | |
| 2756 nfa_save_listids(start->out1, list); | |
| 2757 } | |
| 2758 } | |
| 2759 | |
| 2760 /* | |
| 2761 * Restore list IDs from "list" to all NFA states. | |
| 2762 */ | |
| 2763 static void | |
| 2764 nfa_restore_listids(start, list) | |
| 2765 nfa_state_T *start; | |
| 2766 int *list; | |
| 2767 { | |
| 2768 if (start == NULL) | |
| 2769 return; | |
| 2770 if (start->lastlist == -1) | |
| 2771 { | |
| 2772 start->lastlist = list[abs(start->id)]; | |
| 2773 nfa_restore_listids(start->out, list); | |
| 2774 nfa_restore_listids(start->out1, list); | |
| 2775 } | |
| 2776 } | |
| 2777 | |
| 2778 /* | |
| 2779 * Main matching routine. | |
| 2780 * | |
| 2781 * Run NFA to determine whether it matches reginput. | |
| 2782 * | |
| 2783 * Return TRUE if there is a match, FALSE otherwise. | |
| 2784 * Note: Caller must ensure that: start != NULL. | |
| 2785 */ | |
| 2786 static int | |
| 2787 nfa_regmatch(start, submatch, m) | |
| 2788 nfa_state_T *start; | |
| 2789 regsub_T *submatch; | |
| 2790 regsub_T *m; | |
| 2791 { | |
|
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|
2792 int c; |
| 4444 | 2793 int n; |
| 2794 int i = 0; | |
| 2795 int result; | |
| 2796 int size = 0; | |
| 2797 int match = FALSE; | |
| 2798 int flag = 0; | |
| 2799 int old_reglnum = -1; | |
|
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|
2800 int go_to_nextline; |
| 4444 | 2801 thread_T *t; |
| 2802 char_u *old_reginput = NULL; | |
| 2803 char_u *old_regline = NULL; | |
| 2804 nfa_state_T *sta; | |
| 2805 nfa_state_T *end; | |
| 2806 List list[3]; | |
| 2807 List *listtbl[2][2]; | |
| 2808 List *ll; | |
| 2809 int listid = 1; | |
| 2810 List *thislist; | |
| 2811 List *nextlist; | |
| 2812 List *neglist; | |
| 2813 int *listids = NULL; | |
| 2814 int j = 0; | |
| 2815 int len = 0; | |
| 4460 | 2816 #ifdef NFA_REGEXP_DEBUG_LOG |
| 2817 FILE *debug = fopen(NFA_REGEXP_DEBUG_LOG_NAME, "a"); | |
| 4444 | 2818 |
| 2819 if (debug == NULL) | |
| 2820 { | |
| 4460 | 2821 EMSG2(_("(NFA) COULD NOT OPEN %s !"), NFA_REGEXP_DEBUG_LOG_NAME); |
| 4444 | 2822 return FALSE; |
| 2823 } | |
| 2824 #endif | |
| 2825 | |
| 2826 /* Allocate memory for the lists of nodes */ | |
| 2827 size = (nstate + 1) * sizeof(thread_T); | |
| 2828 list[0].t = (thread_T *)lalloc(size, TRUE); | |
| 2829 list[1].t = (thread_T *)lalloc(size, TRUE); | |
| 2830 list[2].t = (thread_T *)lalloc(size, TRUE); | |
| 2831 if (list[0].t == NULL || list[1].t == NULL || list[2].t == NULL) | |
| 2832 goto theend; | |
| 2833 vim_memset(list[0].t, 0, size); | |
| 2834 vim_memset(list[1].t, 0, size); | |
| 2835 vim_memset(list[2].t, 0, size); | |
| 2836 | |
| 2837 #ifdef ENABLE_LOG | |
| 2838 log_fd = fopen(LOG_NAME, "a"); | |
| 2839 if (log_fd != NULL) | |
| 2840 { | |
| 2841 fprintf(log_fd, "**********************************\n"); | |
| 2842 nfa_set_code(start->c); | |
| 2843 fprintf(log_fd, " RUNNING nfa_regmatch() starting with state %d, code %s\n", | |
| 2844 abs(start->id), code); | |
| 2845 fprintf(log_fd, "**********************************\n"); | |
| 2846 } | |
| 2847 else | |
| 2848 { | |
| 2849 EMSG(_("Could not open temporary log file for writing, displaying on stderr ... ")); | |
| 2850 log_fd = stderr; | |
| 2851 } | |
| 2852 #endif | |
| 2853 | |
| 2854 thislist = &list[0]; | |
| 2855 thislist->n = 0; | |
| 2856 nextlist = &list[1]; | |
| 2857 nextlist->n = 0; | |
| 2858 neglist = &list[2]; | |
| 2859 neglist->n = 0; | |
| 2860 #ifdef ENABLE_LOG | |
| 2861 fprintf(log_fd, "(---) STARTSTATE\n"); | |
| 2862 #endif | |
| 2863 addstate(thislist, start, m, 0, listid, &match); | |
| 2864 | |
| 2865 /* There are two cases when the NFA advances: 1. input char matches the | |
| 2866 * NFA node and 2. input char does not match the NFA node, but the next | |
| 2867 * node is NFA_NOT. The following macro calls addstate() according to | |
| 2868 * these rules. It is used A LOT, so use the "listtbl" table for speed */ | |
| 2869 listtbl[0][0] = NULL; | |
| 2870 listtbl[0][1] = neglist; | |
| 2871 listtbl[1][0] = nextlist; | |
| 2872 listtbl[1][1] = NULL; | |
| 2873 #define ADD_POS_NEG_STATE(node) \ | |
| 2874 ll = listtbl[result ? 1 : 0][node->negated]; \ | |
| 2875 if (ll != NULL) \ | |
| 2876 addstate(ll, node->out , &t->sub, n, listid + 1, &match); | |
| 2877 | |
| 2878 | |
| 2879 /* | |
| 2880 * Run for each character. | |
| 2881 */ | |
|
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2882 for (;;) |
|
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|
2883 { |
| 4444 | 2884 #ifdef FEAT_MBYTE |
| 2885 if (has_mbyte) | |
| 2886 { | |
| 2887 c = (*mb_ptr2char)(reginput); | |
| 2888 n = (*mb_ptr2len)(reginput); | |
| 2889 } | |
| 2890 else | |
| 2891 #endif | |
| 2892 { | |
| 2893 c = *reginput; | |
| 2894 n = 1; | |
| 2895 } | |
| 2896 if (c == NUL) | |
|
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2897 { |
| 4444 | 2898 n = 0; |
|
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2899 go_to_nextline = FALSE; |
|
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|
2900 } |
| 4444 | 2901 |
| 2902 /* swap lists */ | |
| 2903 thislist = &list[flag]; | |
| 2904 nextlist = &list[flag ^= 1]; | |
| 2905 nextlist->n = 0; /* `clear' nextlist */ | |
| 2906 listtbl[1][0] = nextlist; | |
| 2907 ++listid; | |
| 2908 | |
| 2909 #ifdef ENABLE_LOG | |
| 2910 fprintf(log_fd, "------------------------------------------\n"); | |
| 2911 fprintf(log_fd, ">>> Reginput is \"%s\"\n", reginput); | |
| 2912 fprintf(log_fd, ">>> Advanced one character ... Current char is %c (code %d) \n", c, (int)c); | |
| 2913 fprintf(log_fd, ">>> Thislist has %d states available: ", thislist->n); | |
| 2914 for (i = 0; i< thislist->n; i++) | |
| 2915 fprintf(log_fd, "%d ", abs(thislist->t[i].state->id)); | |
| 2916 fprintf(log_fd, "\n"); | |
| 2917 #endif | |
| 2918 | |
| 4460 | 2919 #ifdef NFA_REGEXP_DEBUG_LOG |
| 4444 | 2920 fprintf(debug, "\n-------------------\n"); |
| 2921 #endif | |
| 4480 | 2922 /* |
| 2923 * If the state lists are empty we can stop. | |
| 2924 */ | |
| 2925 if (thislist->n == 0 && neglist->n == 0) | |
| 2926 break; | |
| 4444 | 2927 |
| 2928 /* compute nextlist */ | |
| 2929 for (i = 0; i < thislist->n || neglist->n > 0; ++i) | |
| 2930 { | |
| 2931 if (neglist->n > 0) | |
| 2932 { | |
| 2933 t = &neglist->t[0]; | |
| 4468 | 2934 neglist->n--; |
| 4444 | 2935 i--; |
| 2936 } | |
| 2937 else | |
| 2938 t = &thislist->t[i]; | |
| 2939 | |
| 4460 | 2940 #ifdef NFA_REGEXP_DEBUG_LOG |
| 4444 | 2941 nfa_set_code(t->state->c); |
| 2942 fprintf(debug, "%s, ", code); | |
| 2943 #endif | |
| 2944 #ifdef ENABLE_LOG | |
| 2945 nfa_set_code(t->state->c); | |
| 2946 fprintf(log_fd, "(%d) %s, code %d ... \n", abs(t->state->id), | |
| 2947 code, (int)t->state->c); | |
| 2948 #endif | |
| 2949 | |
| 2950 /* | |
| 2951 * Handle the possible codes of the current state. | |
| 2952 * The most important is NFA_MATCH. | |
| 2953 */ | |
| 2954 switch (t->state->c) | |
| 2955 { | |
| 2956 case NFA_MATCH: | |
| 2957 match = TRUE; | |
| 2958 *submatch = t->sub; | |
| 2959 #ifdef ENABLE_LOG | |
| 2960 for (j = 0; j < 4; j++) | |
| 2961 if (REG_MULTI) | |
| 2962 fprintf(log_fd, "\n *** group %d, start: c=%d, l=%d, end: c=%d, l=%d", | |
| 2963 j, | |
| 2964 t->sub.startpos[j].col, | |
| 2965 (int)t->sub.startpos[j].lnum, | |
| 2966 t->sub.endpos[j].col, | |
| 2967 (int)t->sub.endpos[j].lnum); | |
| 2968 else | |
| 2969 fprintf(log_fd, "\n *** group %d, start: \"%s\", end: \"%s\"", | |
| 2970 j, | |
| 2971 (char *)t->sub.start[j], | |
| 2972 (char *)t->sub.end[j]); | |
| 2973 fprintf(log_fd, "\n"); | |
| 2974 #endif | |
|
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2975 /* Found the left-most longest match, do not look at any other |
|
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|
2976 * states at this position. */ |
|
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|
2977 goto nextchar; |
| 4444 | 2978 |
| 2979 case NFA_END_INVISIBLE: | |
| 2980 /* This is only encountered after a NFA_START_INVISIBLE node. | |
| 2981 * They surround a zero-width group, used with "\@=" and "\&". | |
| 2982 * If we got here, it means that the current "invisible" group | |
| 2983 * finished successfully, so return control to the parent | |
| 2984 * nfa_regmatch(). Submatches are stored in *m, and used in | |
| 2985 * the parent call. */ | |
| 2986 if (start->c == NFA_MOPEN + 0) | |
| 2987 addstate(thislist, t->state->out, &t->sub, 0, listid, | |
| 2988 &match); | |
| 2989 else | |
| 2990 { | |
| 2991 *m = t->sub; | |
| 2992 match = TRUE; | |
| 2993 } | |
| 2994 break; | |
| 2995 | |
| 2996 case NFA_START_INVISIBLE: | |
| 2997 /* Save global variables, and call nfa_regmatch() to check if | |
| 2998 * the current concat matches at this position. The concat | |
| 2999 * ends with the node NFA_END_INVISIBLE */ | |
| 3000 old_reginput = reginput; | |
| 3001 old_regline = regline; | |
| 3002 old_reglnum = reglnum; | |
| 3003 if (listids == NULL) | |
| 3004 { | |
| 3005 listids = (int *) lalloc(sizeof(int) * nstate, TRUE); | |
| 3006 if (listids == NULL) | |
| 3007 { | |
| 3008 EMSG(_("E878: (NFA) Could not allocate memory for branch traversal!")); | |
| 3009 return 0; | |
| 3010 } | |
| 3011 } | |
| 3012 #ifdef ENABLE_LOG | |
| 3013 if (log_fd != stderr) | |
| 3014 fclose(log_fd); | |
| 3015 log_fd = NULL; | |
| 3016 #endif | |
| 3017 /* Have to clear the listid field of the NFA nodes, so that | |
| 3018 * nfa_regmatch() and addstate() can run properly after | |
| 3019 * recursion. */ | |
| 3020 nfa_save_listids(start, listids); | |
| 3021 nfa_set_null_listids(start); | |
| 3022 result = nfa_regmatch(t->state->out, submatch, m); | |
| 3023 nfa_set_neg_listids(start); | |
| 3024 nfa_restore_listids(start, listids); | |
| 3025 | |
| 3026 #ifdef ENABLE_LOG | |
| 3027 log_fd = fopen(LOG_NAME, "a"); | |
| 3028 if (log_fd != NULL) | |
| 3029 { | |
| 3030 fprintf(log_fd, "****************************\n"); | |
| 3031 fprintf(log_fd, "FINISHED RUNNING nfa_regmatch() recursively\n"); | |
| 3032 fprintf(log_fd, "MATCH = %s\n", result == TRUE ? "OK" : "FALSE"); | |
| 3033 fprintf(log_fd, "****************************\n"); | |
| 3034 } | |
| 3035 else | |
| 3036 { | |
| 3037 EMSG(_("Could not open temporary log file for writing, displaying on stderr ... ")); | |
| 3038 log_fd = stderr; | |
| 3039 } | |
| 3040 #endif | |
| 3041 if (result == TRUE) | |
| 3042 { | |
| 3043 /* Restore position in input text */ | |
| 3044 reginput = old_reginput; | |
| 3045 regline = old_regline; | |
| 3046 reglnum = old_reglnum; | |
| 3047 /* Copy submatch info from the recursive call */ | |
| 3048 if (REG_MULTI) | |
| 3049 for (j = 1; j < NSUBEXP; j++) | |
| 3050 { | |
| 3051 t->sub.startpos[j] = m->startpos[j]; | |
| 3052 t->sub.endpos[j] = m->endpos[j]; | |
| 3053 } | |
| 3054 else | |
| 3055 for (j = 1; j < NSUBEXP; j++) | |
| 3056 { | |
| 3057 t->sub.start[j] = m->start[j]; | |
| 3058 t->sub.end[j] = m->end[j]; | |
| 3059 } | |
| 3060 /* t->state->out1 is the corresponding END_INVISIBLE node */ | |
| 3061 addstate(thislist, t->state->out1->out, &t->sub, 0, listid, | |
| 3062 &match); | |
| 3063 } | |
| 3064 else | |
| 3065 { | |
| 3066 /* continue with next input char */ | |
| 3067 reginput = old_reginput; | |
| 3068 } | |
| 3069 break; | |
| 3070 | |
| 3071 case NFA_BOL: | |
| 3072 if (reginput == regline) | |
| 3073 addstate(thislist, t->state->out, &t->sub, 0, listid, | |
| 3074 &match); | |
| 3075 break; | |
| 3076 | |
| 3077 case NFA_EOL: | |
| 3078 if (c == NUL) | |
| 3079 addstate(thislist, t->state->out, &t->sub, 0, listid, | |
| 3080 &match); | |
| 3081 break; | |
| 3082 | |
| 3083 case NFA_BOW: | |
| 3084 { | |
| 3085 int bow = TRUE; | |
| 3086 | |
| 3087 if (c == NUL) | |
| 3088 bow = FALSE; | |
| 3089 #ifdef FEAT_MBYTE | |
| 3090 else if (has_mbyte) | |
| 3091 { | |
| 3092 int this_class; | |
| 3093 | |
| 3094 /* Get class of current and previous char (if it exists). */ | |
| 4503 | 3095 this_class = mb_get_class_buf(reginput, reg_buf); |
| 4444 | 3096 if (this_class <= 1) |
| 3097 bow = FALSE; | |
| 3098 else if (reg_prev_class() == this_class) | |
| 3099 bow = FALSE; | |
| 3100 } | |
| 3101 #endif | |
| 4503 | 3102 else if (!vim_iswordc_buf(c, reg_buf) |
| 3103 || (reginput > regline | |
| 3104 && vim_iswordc_buf(reginput[-1], reg_buf))) | |
| 4444 | 3105 bow = FALSE; |
| 3106 if (bow) | |
| 3107 addstate(thislist, t->state->out, &t->sub, 0, listid, | |
| 3108 &match); | |
| 3109 break; | |
| 3110 } | |
| 3111 | |
| 3112 case NFA_EOW: | |
| 3113 { | |
| 3114 int eow = TRUE; | |
| 3115 | |
| 3116 if (reginput == regline) | |
| 3117 eow = FALSE; | |
| 3118 #ifdef FEAT_MBYTE | |
| 3119 else if (has_mbyte) | |
| 3120 { | |
| 3121 int this_class, prev_class; | |
| 3122 | |
| 3123 /* Get class of current and previous char (if it exists). */ | |
| 4503 | 3124 this_class = mb_get_class_buf(reginput, reg_buf); |
| 4444 | 3125 prev_class = reg_prev_class(); |
| 3126 if (this_class == prev_class | |
| 3127 || prev_class == 0 || prev_class == 1) | |
| 3128 eow = FALSE; | |
| 3129 } | |
| 3130 #endif | |
| 4503 | 3131 else if (!vim_iswordc_buf(reginput[-1], reg_buf) |
| 3132 || (reginput[0] != NUL && vim_iswordc_buf(c, reg_buf))) | |
| 4444 | 3133 eow = FALSE; |
| 3134 if (eow) | |
| 3135 addstate(thislist, t->state->out, &t->sub, 0, listid, | |
| 3136 &match); | |
| 3137 break; | |
| 3138 } | |
| 3139 | |
|
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3140 #ifdef FEAT_MBYTE |
| 4444 | 3141 case NFA_COMPOSING: |
|
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3142 { |
|
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|
3143 int mc = c; |
|
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|
3144 |
| 4444 | 3145 result = OK; |
| 3146 sta = t->state->out; | |
|
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3147 len = 0; |
|
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3148 while (sta->c != NFA_END_COMPOSING && len < n) |
| 4444 | 3149 { |
|
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|
3150 if (len > 0) |
|
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|
3151 mc = mb_ptr2char(reginput + len); |
|
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|
3152 if (mc != sta->c) |
| 4444 | 3153 break; |
|
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3154 len += mb_char2len(mc); |
| 4444 | 3155 sta = sta->out; |
| 3156 } | |
| 3157 | |
| 3158 /* if input char length doesn't match regexp char length */ | |
|
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3159 if (len < n || sta->c != NFA_END_COMPOSING) |
|
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|
3160 result = FAIL; |
|
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|
3161 end = t->state->out1; /* NFA_END_COMPOSING */ |
| 4444 | 3162 /* If \Z was present, then ignore composing characters */ |
|
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|
3163 if (ireg_icombine) |
| 4444 | 3164 result = 1 ^ sta->negated; |
| 3165 ADD_POS_NEG_STATE(end); | |
| 3166 break; | |
|
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|
3167 } |
|
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|
3168 #endif |
| 4444 | 3169 |
| 3170 case NFA_NEWL: | |
| 3171 if (!reg_line_lbr && REG_MULTI | |
|
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3172 && c == NUL && reglnum <= reg_maxline) |
| 4444 | 3173 { |
|
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3174 go_to_nextline = TRUE; |
|
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|
3175 /* Pass -1 for the offset, which means taking the position |
|
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|
3176 * at the start of the next line. */ |
|
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|
3177 addstate(nextlist, t->state->out, &t->sub, -1, |
|
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|
3178 listid + 1, &match); |
| 4444 | 3179 } |
| 3180 break; | |
| 3181 | |
| 3182 case NFA_CLASS_ALNUM: | |
| 3183 case NFA_CLASS_ALPHA: | |
| 3184 case NFA_CLASS_BLANK: | |
| 3185 case NFA_CLASS_CNTRL: | |
| 3186 case NFA_CLASS_DIGIT: | |
| 3187 case NFA_CLASS_GRAPH: | |
| 3188 case NFA_CLASS_LOWER: | |
| 3189 case NFA_CLASS_PRINT: | |
| 3190 case NFA_CLASS_PUNCT: | |
| 3191 case NFA_CLASS_SPACE: | |
| 3192 case NFA_CLASS_UPPER: | |
| 3193 case NFA_CLASS_XDIGIT: | |
| 3194 case NFA_CLASS_TAB: | |
| 3195 case NFA_CLASS_RETURN: | |
| 3196 case NFA_CLASS_BACKSPACE: | |
| 3197 case NFA_CLASS_ESCAPE: | |
| 3198 result = check_char_class(t->state->c, c); | |
| 3199 ADD_POS_NEG_STATE(t->state); | |
| 3200 break; | |
| 3201 | |
| 3202 case NFA_END_NEG_RANGE: | |
| 3203 /* This follows a series of negated nodes, like: | |
| 3204 * CHAR(x), NFA_NOT, CHAR(y), NFA_NOT etc. */ | |
| 3205 if (c > 0) | |
| 3206 addstate(nextlist, t->state->out, &t->sub, n, listid + 1, | |
| 3207 &match); | |
| 3208 break; | |
| 3209 | |
| 3210 case NFA_ANY: | |
|
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|
3211 /* Any char except '\0', (end of input) does not match. */ |
| 4444 | 3212 if (c > 0) |
| 3213 addstate(nextlist, t->state->out, &t->sub, n, listid + 1, | |
| 3214 &match); | |
| 3215 break; | |
| 3216 | |
| 3217 /* | |
| 3218 * Character classes like \a for alpha, \d for digit etc. | |
| 3219 */ | |
| 3220 case NFA_IDENT: /* \i */ | |
| 3221 result = vim_isIDc(c); | |
| 3222 ADD_POS_NEG_STATE(t->state); | |
| 3223 break; | |
| 3224 | |
| 3225 case NFA_SIDENT: /* \I */ | |
| 3226 result = !VIM_ISDIGIT(c) && vim_isIDc(c); | |
| 3227 ADD_POS_NEG_STATE(t->state); | |
| 3228 break; | |
| 3229 | |
| 3230 case NFA_KWORD: /* \k */ | |
| 4503 | 3231 result = vim_iswordp_buf(reginput, reg_buf); |
| 4444 | 3232 ADD_POS_NEG_STATE(t->state); |
| 3233 break; | |
| 3234 | |
| 3235 case NFA_SKWORD: /* \K */ | |
| 4503 | 3236 result = !VIM_ISDIGIT(c) && vim_iswordp_buf(reginput, reg_buf); |
| 4444 | 3237 ADD_POS_NEG_STATE(t->state); |
| 3238 break; | |
| 3239 | |
| 3240 case NFA_FNAME: /* \f */ | |
| 3241 result = vim_isfilec(c); | |
| 3242 ADD_POS_NEG_STATE(t->state); | |
| 3243 break; | |
| 3244 | |
| 3245 case NFA_SFNAME: /* \F */ | |
| 3246 result = !VIM_ISDIGIT(c) && vim_isfilec(c); | |
| 3247 ADD_POS_NEG_STATE(t->state); | |
| 3248 break; | |
| 3249 | |
| 3250 case NFA_PRINT: /* \p */ | |
| 4470 | 3251 result = ptr2cells(reginput) == 1; |
| 4444 | 3252 ADD_POS_NEG_STATE(t->state); |
| 3253 break; | |
| 3254 | |
| 3255 case NFA_SPRINT: /* \P */ | |
| 4470 | 3256 result = !VIM_ISDIGIT(c) && ptr2cells(reginput) == 1; |
| 4444 | 3257 ADD_POS_NEG_STATE(t->state); |
| 3258 break; | |
| 3259 | |
| 3260 case NFA_WHITE: /* \s */ | |
| 3261 result = vim_iswhite(c); | |
| 3262 ADD_POS_NEG_STATE(t->state); | |
| 3263 break; | |
| 3264 | |
| 3265 case NFA_NWHITE: /* \S */ | |
| 3266 result = c != NUL && !vim_iswhite(c); | |
| 3267 ADD_POS_NEG_STATE(t->state); | |
| 3268 break; | |
| 3269 | |
| 3270 case NFA_DIGIT: /* \d */ | |
| 3271 result = ri_digit(c); | |
| 3272 ADD_POS_NEG_STATE(t->state); | |
| 3273 break; | |
| 3274 | |
| 3275 case NFA_NDIGIT: /* \D */ | |
| 3276 result = c != NUL && !ri_digit(c); | |
| 3277 ADD_POS_NEG_STATE(t->state); | |
| 3278 break; | |
| 3279 | |
| 3280 case NFA_HEX: /* \x */ | |
| 3281 result = ri_hex(c); | |
| 3282 ADD_POS_NEG_STATE(t->state); | |
| 3283 break; | |
| 3284 | |
| 3285 case NFA_NHEX: /* \X */ | |
| 3286 result = c != NUL && !ri_hex(c); | |
| 3287 ADD_POS_NEG_STATE(t->state); | |
| 3288 break; | |
| 3289 | |
| 3290 case NFA_OCTAL: /* \o */ | |
| 3291 result = ri_octal(c); | |
| 3292 ADD_POS_NEG_STATE(t->state); | |
| 3293 break; | |
| 3294 | |
| 3295 case NFA_NOCTAL: /* \O */ | |
| 3296 result = c != NUL && !ri_octal(c); | |
| 3297 ADD_POS_NEG_STATE(t->state); | |
| 3298 break; | |
| 3299 | |
| 3300 case NFA_WORD: /* \w */ | |
| 3301 result = ri_word(c); | |
| 3302 ADD_POS_NEG_STATE(t->state); | |
| 3303 break; | |
| 3304 | |
| 3305 case NFA_NWORD: /* \W */ | |
| 3306 result = c != NUL && !ri_word(c); | |
| 3307 ADD_POS_NEG_STATE(t->state); | |
| 3308 break; | |
| 3309 | |
| 3310 case NFA_HEAD: /* \h */ | |
| 3311 result = ri_head(c); | |
| 3312 ADD_POS_NEG_STATE(t->state); | |
| 3313 break; | |
| 3314 | |
| 3315 case NFA_NHEAD: /* \H */ | |
| 3316 result = c != NUL && !ri_head(c); | |
| 3317 ADD_POS_NEG_STATE(t->state); | |
| 3318 break; | |
| 3319 | |
| 3320 case NFA_ALPHA: /* \a */ | |
| 3321 result = ri_alpha(c); | |
| 3322 ADD_POS_NEG_STATE(t->state); | |
| 3323 break; | |
| 3324 | |
| 3325 case NFA_NALPHA: /* \A */ | |
| 3326 result = c != NUL && !ri_alpha(c); | |
| 3327 ADD_POS_NEG_STATE(t->state); | |
| 3328 break; | |
| 3329 | |
| 3330 case NFA_LOWER: /* \l */ | |
| 3331 result = ri_lower(c); | |
| 3332 ADD_POS_NEG_STATE(t->state); | |
| 3333 break; | |
| 3334 | |
| 3335 case NFA_NLOWER: /* \L */ | |
| 3336 result = c != NUL && !ri_lower(c); | |
| 3337 ADD_POS_NEG_STATE(t->state); | |
| 3338 break; | |
| 3339 | |
| 3340 case NFA_UPPER: /* \u */ | |
| 3341 result = ri_upper(c); | |
| 3342 ADD_POS_NEG_STATE(t->state); | |
| 3343 break; | |
| 3344 | |
| 3345 case NFA_NUPPER: /* \U */ | |
| 3346 result = c != NUL && !ri_upper(c); | |
| 3347 ADD_POS_NEG_STATE(t->state); | |
| 3348 break; | |
| 3349 | |
| 4482 | 3350 case NFA_MOPEN + 0: |
| 3351 case NFA_MOPEN + 1: | |
| 3352 case NFA_MOPEN + 2: | |
| 3353 case NFA_MOPEN + 3: | |
| 3354 case NFA_MOPEN + 4: | |
| 3355 case NFA_MOPEN + 5: | |
| 3356 case NFA_MOPEN + 6: | |
| 3357 case NFA_MOPEN + 7: | |
| 3358 case NFA_MOPEN + 8: | |
| 3359 case NFA_MOPEN + 9: | |
| 3360 /* handled below */ | |
| 3361 break; | |
| 3362 | |
| 3363 case NFA_SKIP_CHAR: | |
| 3364 case NFA_ZSTART: | |
| 3365 /* TODO: should not happen? */ | |
| 3366 break; | |
| 3367 | |
| 4444 | 3368 default: /* regular character */ |
| 4482 | 3369 /* TODO: put this in #ifdef later */ |
| 3370 if (t->state->c < -256) | |
| 3371 EMSGN("INTERNAL: Negative state char: %ld", t->state->c); | |
| 4444 | 3372 result = (no_Magic(t->state->c) == c); |
| 4482 | 3373 |
| 4444 | 3374 if (!result) |
| 3375 result = ireg_ic == TRUE | |
| 3376 && MB_TOLOWER(t->state->c) == MB_TOLOWER(c); | |
|
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|
3377 #ifdef FEAT_MBYTE |
|
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|
3378 /* If there is a composing character which is not being |
|
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|
3379 * ignored there can be no match. Match with composing |
|
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|
3380 * character uses NFA_COMPOSING above. */ |
|
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|
3381 if (result && enc_utf8 && !ireg_icombine |
|
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|
3382 && n != utf_char2len(c)) |
|
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|
3383 result = FALSE; |
|
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|
3384 #endif |
| 4444 | 3385 ADD_POS_NEG_STATE(t->state); |
| 3386 break; | |
| 3387 } | |
| 3388 | |
| 3389 } /* for (thislist = thislist; thislist->state; thislist++) */ | |
| 3390 | |
| 3391 /* The first found match is the leftmost one, but there may be a | |
| 3392 * longer one. Keep running the NFA, but don't start from the | |
| 3393 * beginning. Also, do not add the start state in recursive calls of | |
| 3394 * nfa_regmatch(), because recursive calls should only start in the | |
| 3395 * first position. */ | |
| 3396 if (match == FALSE && start->c == NFA_MOPEN + 0) | |
| 3397 { | |
| 3398 #ifdef ENABLE_LOG | |
| 3399 fprintf(log_fd, "(---) STARTSTATE\n"); | |
| 3400 #endif | |
| 3401 addstate(nextlist, start, m, n, listid + 1, &match); | |
| 3402 } | |
| 3403 | |
| 3404 #ifdef ENABLE_LOG | |
| 3405 fprintf(log_fd, ">>> Thislist had %d states available: ", thislist->n); | |
| 3406 for (i = 0; i< thislist->n; i++) | |
| 3407 fprintf(log_fd, "%d ", abs(thislist->t[i].state->id)); | |
| 3408 fprintf(log_fd, "\n"); | |
| 3409 #endif | |
| 3410 | |
| 3411 nextchar: | |
|
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|
3412 /* Advance to the next character, or advance to the next line, or |
|
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|
3413 * finish. */ |
|
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|
3414 if (n != 0) |
|
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|
3415 reginput += n; |
|
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|
3416 else if (go_to_nextline) |
|
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|
3417 reg_nextline(); |
|
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|
3418 else |
|
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|
3419 break; |
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|
3420 } |
| 4444 | 3421 |
| 3422 #ifdef ENABLE_LOG | |
| 3423 if (log_fd != stderr) | |
| 3424 fclose(log_fd); | |
| 3425 log_fd = NULL; | |
| 3426 #endif | |
| 3427 | |
| 3428 theend: | |
| 3429 /* Free memory */ | |
| 3430 vim_free(list[0].t); | |
| 3431 vim_free(list[1].t); | |
| 3432 vim_free(list[2].t); | |
| 3433 list[0].t = list[1].t = list[2].t = NULL; | |
| 3434 if (listids != NULL) | |
| 3435 vim_free(listids); | |
| 3436 #undef ADD_POS_NEG_STATE | |
| 4460 | 3437 #ifdef NFA_REGEXP_DEBUG_LOG |
| 4444 | 3438 fclose(debug); |
| 3439 #endif | |
| 3440 | |
| 3441 return match; | |
| 3442 } | |
| 3443 | |
| 3444 /* | |
| 3445 * Try match of "prog" with at regline["col"]. | |
| 3446 * Returns 0 for failure, number of lines contained in the match otherwise. | |
| 3447 */ | |
| 3448 static long | |
| 3449 nfa_regtry(start, col) | |
| 3450 nfa_state_T *start; | |
| 3451 colnr_T col; | |
| 3452 { | |
| 3453 int i; | |
| 3454 regsub_T sub, m; | |
| 3455 #ifdef ENABLE_LOG | |
| 3456 FILE *f; | |
| 3457 #endif | |
| 3458 | |
| 3459 reginput = regline + col; | |
| 3460 need_clear_subexpr = TRUE; | |
| 3461 | |
| 3462 #ifdef ENABLE_LOG | |
| 3463 f = fopen(LOG_NAME, "a"); | |
| 3464 if (f != NULL) | |
| 3465 { | |
| 3466 fprintf(f, "\n\n\n\n\n\n\t\t=======================================================\n"); | |
| 3467 fprintf(f, " =======================================================\n"); | |
| 3468 #ifdef DEBUG | |
| 3469 fprintf(f, "\tRegexp is \"%s\"\n", nfa_regengine.expr); | |
| 3470 #endif | |
| 3471 fprintf(f, "\tInput text is \"%s\" \n", reginput); | |
| 3472 fprintf(f, " =======================================================\n\n\n\n\n\n\n"); | |
| 3473 nfa_print_state(f, start, 0); | |
| 3474 fprintf(f, "\n\n"); | |
| 3475 fclose(f); | |
| 3476 } | |
| 3477 else | |
| 3478 EMSG(_("Could not open temporary log file for writing ")); | |
| 3479 #endif | |
| 3480 | |
| 3481 if (REG_MULTI) | |
| 3482 { | |
| 3483 /* Use 0xff to set lnum to -1 */ | |
| 3484 vim_memset(sub.startpos, 0xff, sizeof(lpos_T) * NSUBEXP); | |
| 3485 vim_memset(sub.endpos, 0xff, sizeof(lpos_T) * NSUBEXP); | |
| 3486 vim_memset(m.startpos, 0xff, sizeof(lpos_T) * NSUBEXP); | |
| 3487 vim_memset(m.endpos, 0xff, sizeof(lpos_T) * NSUBEXP); | |
| 3488 } | |
| 3489 else | |
| 3490 { | |
| 3491 vim_memset(sub.start, 0, sizeof(char_u *) * NSUBEXP); | |
| 3492 vim_memset(sub.end, 0, sizeof(char_u *) * NSUBEXP); | |
| 3493 vim_memset(m.start, 0, sizeof(char_u *) * NSUBEXP); | |
| 3494 vim_memset(m.end, 0, sizeof(char_u *) * NSUBEXP); | |
| 3495 } | |
| 3496 | |
| 3497 if (nfa_regmatch(start, &sub, &m) == FALSE) | |
| 3498 return 0; | |
| 3499 | |
| 3500 cleanup_subexpr(); | |
| 3501 if (REG_MULTI) | |
| 3502 { | |
| 3503 for (i = 0; i < NSUBEXP; i++) | |
| 3504 { | |
| 3505 reg_startpos[i] = sub.startpos[i]; | |
| 3506 reg_endpos[i] = sub.endpos[i]; | |
| 3507 } | |
| 3508 | |
| 3509 if (reg_startpos[0].lnum < 0) | |
| 3510 { | |
| 3511 reg_startpos[0].lnum = 0; | |
| 3512 reg_startpos[0].col = col; | |
| 3513 } | |
| 3514 if (reg_endpos[0].lnum < 0) | |
| 3515 { | |
| 3516 reg_endpos[0].lnum = reglnum; | |
| 3517 reg_endpos[0].col = (int)(reginput - regline); | |
| 3518 } | |
| 3519 else | |
| 3520 /* Use line number of "\ze". */ | |
| 3521 reglnum = reg_endpos[0].lnum; | |
| 3522 } | |
| 3523 else | |
| 3524 { | |
| 3525 for (i = 0; i < NSUBEXP; i++) | |
| 3526 { | |
| 3527 reg_startp[i] = sub.start[i]; | |
| 3528 reg_endp[i] = sub.end[i]; | |
| 3529 } | |
| 3530 | |
| 3531 if (reg_startp[0] == NULL) | |
| 3532 reg_startp[0] = regline + col; | |
| 3533 if (reg_endp[0] == NULL) | |
| 3534 reg_endp[0] = reginput; | |
| 3535 } | |
| 3536 | |
| 3537 return 1 + reglnum; | |
| 3538 } | |
| 3539 | |
| 3540 /* | |
| 3541 * Match a regexp against a string ("line" points to the string) or multiple | |
| 3542 * lines ("line" is NULL, use reg_getline()). | |
| 3543 * | |
| 3544 * Returns 0 for failure, number of lines contained in the match otherwise. | |
| 3545 */ | |
| 3546 static long | |
| 3547 nfa_regexec_both(line, col) | |
| 3548 char_u *line; | |
| 3549 colnr_T col; /* column to start looking for match */ | |
| 3550 { | |
| 3551 nfa_regprog_T *prog; | |
| 3552 long retval = 0L; | |
| 3553 int i; | |
| 3554 | |
| 3555 if (REG_MULTI) | |
| 3556 { | |
| 3557 prog = (nfa_regprog_T *)reg_mmatch->regprog; | |
| 3558 line = reg_getline((linenr_T)0); /* relative to the cursor */ | |
| 3559 reg_startpos = reg_mmatch->startpos; | |
| 3560 reg_endpos = reg_mmatch->endpos; | |
| 3561 } | |
| 3562 else | |
| 3563 { | |
| 3564 prog = (nfa_regprog_T *)reg_match->regprog; | |
| 3565 reg_startp = reg_match->startp; | |
| 3566 reg_endp = reg_match->endp; | |
| 3567 } | |
| 3568 | |
| 3569 /* Be paranoid... */ | |
| 3570 if (prog == NULL || line == NULL) | |
| 3571 { | |
| 3572 EMSG(_(e_null)); | |
| 3573 goto theend; | |
| 3574 } | |
| 3575 | |
| 3576 /* If the start column is past the maximum column: no need to try. */ | |
| 3577 if (ireg_maxcol > 0 && col >= ireg_maxcol) | |
| 3578 goto theend; | |
| 3579 | |
| 3580 /* If pattern contains "\c" or "\C": overrule value of ireg_ic */ | |
| 3581 if (prog->regflags & RF_ICASE) | |
| 3582 ireg_ic = TRUE; | |
| 3583 else if (prog->regflags & RF_NOICASE) | |
| 3584 ireg_ic = FALSE; | |
| 3585 | |
| 3586 #ifdef FEAT_MBYTE | |
| 3587 /* If pattern contains "\Z" overrule value of ireg_icombine */ | |
| 3588 if (prog->regflags & RF_ICOMBINE) | |
| 3589 ireg_icombine = TRUE; | |
| 3590 #endif | |
| 3591 | |
| 3592 regline = line; | |
| 3593 reglnum = 0; /* relative to line */ | |
| 3594 | |
| 3595 nstate = prog->nstate; | |
| 3596 | |
| 3597 for (i = 0; i < nstate; ++i) | |
| 3598 { | |
| 3599 prog->state[i].id = i; | |
| 3600 prog->state[i].lastlist = 0; | |
| 3601 prog->state[i].visits = 0; | |
| 3602 prog->state[i].lastthread = NULL; | |
| 3603 } | |
| 3604 | |
| 3605 retval = nfa_regtry(prog->start, col); | |
| 3606 | |
| 3607 theend: | |
| 3608 return retval; | |
| 3609 } | |
| 3610 | |
| 3611 /* | |
| 3612 * Compile a regular expression into internal code for the NFA matcher. | |
| 3613 * Returns the program in allocated space. Returns NULL for an error. | |
| 3614 */ | |
| 3615 static regprog_T * | |
| 3616 nfa_regcomp(expr, re_flags) | |
| 3617 char_u *expr; | |
| 3618 int re_flags; | |
| 3619 { | |
| 3620 nfa_regprog_T *prog; | |
| 4458 | 3621 size_t prog_size; |
| 4444 | 3622 int *postfix; |
| 3623 | |
| 3624 if (expr == NULL) | |
| 3625 return NULL; | |
| 3626 | |
| 3627 #ifdef DEBUG | |
| 3628 nfa_regengine.expr = expr; | |
| 3629 #endif | |
| 3630 | |
| 3631 init_class_tab(); | |
| 3632 | |
| 3633 if (nfa_regcomp_start(expr, re_flags) == FAIL) | |
| 3634 return NULL; | |
| 3635 | |
| 3636 /* Space for compiled regexp */ | |
| 3637 prog_size = sizeof(nfa_regprog_T) + sizeof(nfa_state_T) * nstate_max; | |
| 3638 prog = (nfa_regprog_T *)lalloc(prog_size, TRUE); | |
| 3639 if (prog == NULL) | |
| 3640 goto fail; | |
| 3641 vim_memset(prog, 0, prog_size); | |
| 3642 | |
| 3643 /* Build postfix form of the regexp. Needed to build the NFA | |
| 3644 * (and count its size) */ | |
| 3645 postfix = re2post(); | |
| 3646 if (postfix == NULL) | |
| 3647 goto fail; /* Cascaded (syntax?) error */ | |
| 3648 | |
| 3649 /* | |
| 3650 * In order to build the NFA, we parse the input regexp twice: | |
| 3651 * 1. first pass to count size (so we can allocate space) | |
| 3652 * 2. second to emit code | |
| 3653 */ | |
| 3654 #ifdef ENABLE_LOG | |
| 3655 { | |
| 3656 FILE *f = fopen(LOG_NAME, "a"); | |
| 3657 | |
| 3658 if (f != NULL) | |
| 3659 { | |
| 3660 fprintf(f, "\n*****************************\n\n\n\n\tCompiling regexp \"%s\" ... hold on !\n", expr); | |
| 3661 fclose(f); | |
| 3662 } | |
| 3663 } | |
| 3664 #endif | |
| 3665 | |
| 3666 /* | |
| 3667 * PASS 1 | |
| 3668 * Count number of NFA states in "nstate". Do not build the NFA. | |
| 3669 */ | |
| 3670 post2nfa(postfix, post_ptr, TRUE); | |
| 3671 state_ptr = prog->state; | |
| 3672 | |
| 3673 /* | |
| 3674 * PASS 2 | |
| 3675 * Build the NFA | |
| 3676 */ | |
| 3677 prog->start = post2nfa(postfix, post_ptr, FALSE); | |
| 3678 if (prog->start == NULL) | |
| 3679 goto fail; | |
| 3680 | |
| 3681 prog->regflags = regflags; | |
| 3682 prog->engine = &nfa_regengine; | |
| 3683 prog->nstate = nstate; | |
| 3684 #ifdef ENABLE_LOG | |
| 3685 nfa_postfix_dump(expr, OK); | |
| 3686 nfa_dump(prog); | |
| 3687 #endif | |
| 3688 | |
| 3689 out: | |
| 3690 vim_free(post_start); | |
| 3691 post_start = post_ptr = post_end = NULL; | |
| 3692 state_ptr = NULL; | |
| 3693 return (regprog_T *)prog; | |
| 3694 | |
| 3695 fail: | |
| 3696 vim_free(prog); | |
| 3697 prog = NULL; | |
| 3698 #ifdef ENABLE_LOG | |
| 3699 nfa_postfix_dump(expr, FAIL); | |
| 3700 #endif | |
| 3701 #ifdef DEBUG | |
| 3702 nfa_regengine.expr = NULL; | |
| 3703 #endif | |
| 3704 goto out; | |
| 3705 } | |
| 3706 | |
| 3707 | |
| 3708 /* | |
| 3709 * Match a regexp against a string. | |
| 3710 * "rmp->regprog" is a compiled regexp as returned by nfa_regcomp(). | |
| 3711 * Uses curbuf for line count and 'iskeyword'. | |
| 3712 * | |
| 3713 * Return TRUE if there is a match, FALSE if not. | |
| 3714 */ | |
| 3715 static int | |
| 3716 nfa_regexec(rmp, line, col) | |
| 3717 regmatch_T *rmp; | |
| 3718 char_u *line; /* string to match against */ | |
| 3719 colnr_T col; /* column to start looking for match */ | |
| 3720 { | |
| 3721 reg_match = rmp; | |
| 3722 reg_mmatch = NULL; | |
| 3723 reg_maxline = 0; | |
| 3724 reg_line_lbr = FALSE; | |
| 3725 reg_buf = curbuf; | |
| 3726 reg_win = NULL; | |
| 3727 ireg_ic = rmp->rm_ic; | |
| 3728 #ifdef FEAT_MBYTE | |
| 3729 ireg_icombine = FALSE; | |
| 3730 #endif | |
| 3731 ireg_maxcol = 0; | |
| 3732 return (nfa_regexec_both(line, col) != 0); | |
| 3733 } | |
| 3734 | |
| 3735 #if defined(FEAT_MODIFY_FNAME) || defined(FEAT_EVAL) \ | |
| 3736 || defined(FIND_REPLACE_DIALOG) || defined(PROTO) | |
| 3737 | |
| 3738 static int nfa_regexec_nl __ARGS((regmatch_T *rmp, char_u *line, colnr_T col)); | |
| 3739 | |
| 3740 /* | |
| 3741 * Like nfa_regexec(), but consider a "\n" in "line" to be a line break. | |
| 3742 */ | |
| 3743 static int | |
| 3744 nfa_regexec_nl(rmp, line, col) | |
| 3745 regmatch_T *rmp; | |
| 3746 char_u *line; /* string to match against */ | |
| 3747 colnr_T col; /* column to start looking for match */ | |
| 3748 { | |
| 3749 reg_match = rmp; | |
| 3750 reg_mmatch = NULL; | |
| 3751 reg_maxline = 0; | |
| 3752 reg_line_lbr = TRUE; | |
| 3753 reg_buf = curbuf; | |
| 3754 reg_win = NULL; | |
| 3755 ireg_ic = rmp->rm_ic; | |
| 3756 #ifdef FEAT_MBYTE | |
| 3757 ireg_icombine = FALSE; | |
| 3758 #endif | |
| 3759 ireg_maxcol = 0; | |
| 3760 return (nfa_regexec_both(line, col) != 0); | |
| 3761 } | |
| 3762 #endif | |
| 3763 | |
| 3764 | |
| 3765 /* | |
| 3766 * Match a regexp against multiple lines. | |
| 3767 * "rmp->regprog" is a compiled regexp as returned by vim_regcomp(). | |
| 3768 * Uses curbuf for line count and 'iskeyword'. | |
| 3769 * | |
| 3770 * Return zero if there is no match. Return number of lines contained in the | |
| 3771 * match otherwise. | |
| 3772 * | |
| 3773 * Note: the body is the same as bt_regexec() except for nfa_regexec_both() | |
| 3774 * | |
| 3775 * ! Also NOTE : match may actually be in another line. e.g.: | |
| 3776 * when r.e. is \nc, cursor is at 'a' and the text buffer looks like | |
| 3777 * | |
| 3778 * +-------------------------+ | |
| 3779 * |a | | |
| 3780 * |b | | |
| 3781 * |c | | |
| 3782 * | | | |
| 3783 * +-------------------------+ | |
| 3784 * | |
| 3785 * then nfa_regexec_multi() returns 3. while the original | |
| 3786 * vim_regexec_multi() returns 0 and a second call at line 2 will return 2. | |
| 3787 * | |
| 3788 * FIXME if this behavior is not compatible. | |
| 3789 */ | |
| 3790 static long | |
| 3791 nfa_regexec_multi(rmp, win, buf, lnum, col, tm) | |
| 3792 regmmatch_T *rmp; | |
| 3793 win_T *win; /* window in which to search or NULL */ | |
| 3794 buf_T *buf; /* buffer in which to search */ | |
| 3795 linenr_T lnum; /* nr of line to start looking for match */ | |
| 3796 colnr_T col; /* column to start looking for match */ | |
| 3797 proftime_T *tm UNUSED; /* timeout limit or NULL */ | |
| 3798 { | |
| 3799 reg_match = NULL; | |
| 3800 reg_mmatch = rmp; | |
| 3801 reg_buf = buf; | |
| 3802 reg_win = win; | |
| 3803 reg_firstlnum = lnum; | |
| 3804 reg_maxline = reg_buf->b_ml.ml_line_count - lnum; | |
| 3805 reg_line_lbr = FALSE; | |
| 3806 ireg_ic = rmp->rmm_ic; | |
| 3807 #ifdef FEAT_MBYTE | |
| 3808 ireg_icombine = FALSE; | |
| 3809 #endif | |
| 3810 ireg_maxcol = rmp->rmm_maxcol; | |
| 3811 | |
| 4503 | 3812 return nfa_regexec_both(NULL, col); |
| 4444 | 3813 } |
| 3814 | |
| 3815 #ifdef DEBUG | |
| 3816 # undef ENABLE_LOG | |
| 3817 #endif |