diff options
Diffstat (limited to 'src/regexp_nfa.c')
| -rw-r--r-- | src/regexp_nfa.c | 3819 |
1 files changed, 3819 insertions, 0 deletions
diff --git a/src/regexp_nfa.c b/src/regexp_nfa.c new file mode 100644 index 000000000..51e355a5f --- /dev/null +++ b/src/regexp_nfa.c @@ -0,0 +1,3819 @@ +/* vi:set ts=8 sts=4 sw=4: + * + * NFA regular expression implementation. + * + * This file is included in "regexp.c". + */ + +#ifdef DEBUG +/* Comment this out to disable log files. They can get pretty big */ +# define ENABLE_LOG +# define LOG_NAME "log_nfarun.log" +#endif + +/* Upper limit allowed for {m,n} repetitions handled by NFA */ +#define NFA_BRACES_MAXLIMIT 10 +/* For allocating space for the postfix representation */ +#define NFA_POSTFIX_MULTIPLIER (NFA_BRACES_MAXLIMIT + 2)*2 +/* Size of stack, used when converting the postfix regexp into NFA */ +#define NFA_STACK_SIZE 1024 + +enum +{ + NFA_SPLIT = -1024, + NFA_MATCH, + NFA_SKIP_CHAR, /* matches a 0-length char */ + NFA_END_NEG_RANGE, /* Used when expanding [^ab] */ + + NFA_CONCAT, + NFA_OR, + NFA_STAR, + NFA_PLUS, + NFA_QUEST, + NFA_QUEST_NONGREEDY, /* Non-greedy version of \? */ + NFA_NOT, /* used for [^ab] negated char ranges */ + + NFA_BOL, /* ^ Begin line */ + NFA_EOL, /* $ End line */ + NFA_BOW, /* \< Begin word */ + NFA_EOW, /* \> End word */ + NFA_BOF, /* \%^ Begin file */ + NFA_EOF, /* \%$ End file */ + NFA_NEWL, + NFA_ZSTART, /* Used for \zs */ + NFA_ZEND, /* Used for \ze */ + NFA_NOPEN, /* Start of subexpression marked with \%( */ + NFA_NCLOSE, /* End of subexpr. marked with \%( ... \) */ + NFA_START_INVISIBLE, + NFA_END_INVISIBLE, + NFA_MULTIBYTE, /* Next nodes in NFA are part of the same + multibyte char */ + NFA_END_MULTIBYTE, /* End of multibyte char in the NFA */ + NFA_COMPOSING, /* Next nodes in NFA are part of the + composing multibyte char */ + NFA_END_COMPOSING, /* End of a composing char in the NFA */ + + /* The following are used only in the postfix form, not in the NFA */ + NFA_PREV_ATOM_NO_WIDTH, /* Used for \@= */ + NFA_PREV_ATOM_NO_WIDTH_NEG, /* Used for \@! */ + NFA_PREV_ATOM_JUST_BEFORE, /* Used for \@<= */ + NFA_PREV_ATOM_JUST_BEFORE_NEG, /* Used for \@<! */ + NFA_PREV_ATOM_LIKE_PATTERN, /* Used for \@> */ + + NFA_MOPEN, + NFA_MCLOSE = NFA_MOPEN + NSUBEXP, + + /* NFA_FIRST_NL */ + NFA_ANY = NFA_MCLOSE + NSUBEXP, /* Match any one character. */ + NFA_ANYOF, /* Match any character in this string. */ + NFA_ANYBUT, /* Match any character not in this string. */ + NFA_IDENT, /* Match identifier char */ + NFA_SIDENT, /* Match identifier char but no digit */ + NFA_KWORD, /* Match keyword char */ + NFA_SKWORD, /* Match word char but no digit */ + NFA_FNAME, /* Match file name char */ + NFA_SFNAME, /* Match file name char but no digit */ + NFA_PRINT, /* Match printable char */ + NFA_SPRINT, /* Match printable char but no digit */ + NFA_WHITE, /* Match whitespace char */ + NFA_NWHITE, /* Match non-whitespace char */ + NFA_DIGIT, /* Match digit char */ + NFA_NDIGIT, /* Match non-digit char */ + NFA_HEX, /* Match hex char */ + NFA_NHEX, /* Match non-hex char */ + NFA_OCTAL, /* Match octal char */ + NFA_NOCTAL, /* Match non-octal char */ + NFA_WORD, /* Match word char */ + NFA_NWORD, /* Match non-word char */ + NFA_HEAD, /* Match head char */ + NFA_NHEAD, /* Match non-head char */ + NFA_ALPHA, /* Match alpha char */ + NFA_NALPHA, /* Match non-alpha char */ + NFA_LOWER, /* Match lowercase char */ + NFA_NLOWER, /* Match non-lowercase char */ + NFA_UPPER, /* Match uppercase char */ + NFA_NUPPER, /* Match non-uppercase char */ + NFA_FIRST_NL = NFA_ANY + ADD_NL, + NFA_LAST_NL = NFA_NUPPER + ADD_NL, + + /* Character classes [:alnum:] etc */ + NFA_CLASS_ALNUM, + NFA_CLASS_ALPHA, + NFA_CLASS_BLANK, + NFA_CLASS_CNTRL, + NFA_CLASS_DIGIT, + NFA_CLASS_GRAPH, + NFA_CLASS_LOWER, + NFA_CLASS_PRINT, + NFA_CLASS_PUNCT, + NFA_CLASS_SPACE, + NFA_CLASS_UPPER, + NFA_CLASS_XDIGIT, + NFA_CLASS_TAB, + NFA_CLASS_RETURN, + NFA_CLASS_BACKSPACE, + NFA_CLASS_ESCAPE +}; + +/* Keep in sync with classchars. */ +static int nfa_classcodes[] = { + NFA_ANY, NFA_IDENT, NFA_SIDENT, NFA_KWORD,NFA_SKWORD, + NFA_FNAME, NFA_SFNAME, NFA_PRINT, NFA_SPRINT, + NFA_WHITE, NFA_NWHITE, NFA_DIGIT, NFA_NDIGIT, + NFA_HEX, NFA_NHEX, NFA_OCTAL, NFA_NOCTAL, + NFA_WORD, NFA_NWORD, NFA_HEAD, NFA_NHEAD, + NFA_ALPHA, NFA_NALPHA, NFA_LOWER, NFA_NLOWER, + NFA_UPPER, NFA_NUPPER +}; + +static char_u e_misplaced[] = N_("E866: (NFA regexp) Misplaced %c"); + +/* + * NFA errors can be of 3 types: + * *** NFA runtime errors, when something unknown goes wrong. The NFA fails + * silently and revert the to backtracking engine. + * syntax_error = FALSE; + * *** Regexp syntax errors, when the input regexp is not syntactically correct. + * The NFA engine displays an error message, and nothing else happens. + * syntax_error = TRUE + * *** Unsupported features, when the input regexp uses an operator that is not + * implemented in the NFA. The NFA engine fails silently, and reverts to the + * old backtracking engine. + * syntax_error = FALSE + * "The NFA fails" means that "compiling the regexp with the NFA fails": + * nfa_regcomp() returns FAIL. + */ +static int syntax_error = FALSE; + +/* NFA regexp \ze operator encountered. */ +static int nfa_has_zend = FALSE; + +static int *post_start; /* holds the postfix form of r.e. */ +static int *post_end; +static int *post_ptr; + +static int nstate; /* Number of states in the NFA. */ +static int istate; /* Index in the state vector, used in new_state() */ +static int nstate_max; /* Upper bound of estimated number of states. */ + + +static int nfa_regcomp_start __ARGS((char_u*expr, int re_flags)); +static int nfa_recognize_char_class __ARGS((char_u *start, char_u *end, int extra_newl)); +static int nfa_emit_equi_class __ARGS((int c, int neg)); +static void nfa_inc __ARGS((char_u **p)); +static void nfa_dec __ARGS((char_u **p)); +static int nfa_regatom __ARGS((void)); +static int nfa_regpiece __ARGS((void)); +static int nfa_regconcat __ARGS((void)); +static int nfa_regbranch __ARGS((void)); +static int nfa_reg __ARGS((int paren)); +#ifdef DEBUG +static void nfa_set_code __ARGS((int c)); +static void nfa_postfix_dump __ARGS((char_u *expr, int retval)); +static void nfa_print_state __ARGS((FILE *debugf, nfa_state_T *state, int ident)); +static void nfa_dump __ARGS((nfa_regprog_T *prog)); +#endif +static int *re2post __ARGS((void)); +static nfa_state_T *new_state __ARGS((int c, nfa_state_T *out, nfa_state_T *out1)); +static nfa_state_T *post2nfa __ARGS((int *postfix, int *end, int nfa_calc_size)); +static int check_char_class __ARGS((int class, int c)); +static void st_error __ARGS((int *postfix, int *end, int *p)); +static void nfa_save_listids __ARGS((nfa_state_T *start, int *list)); +static void nfa_restore_listids __ARGS((nfa_state_T *start, int *list)); +static void nfa_set_null_listids __ARGS((nfa_state_T *start)); +static void nfa_set_neg_listids __ARGS((nfa_state_T *start)); +static long nfa_regtry __ARGS((nfa_state_T *start, colnr_T col)); +static long nfa_regexec_both __ARGS((char_u *line, colnr_T col)); +static regprog_T *nfa_regcomp __ARGS((char_u *expr, int re_flags)); +static int nfa_regexec __ARGS((regmatch_T *rmp, char_u *line, colnr_T col)); +static long nfa_regexec_multi __ARGS((regmmatch_T *rmp, win_T *win, buf_T *buf, linenr_T lnum, colnr_T col, proftime_T *tm)); + +/* helper functions used when doing re2post() ... regatom() parsing */ +#define EMIT(c) do { \ + if (post_ptr >= post_end) \ + return FAIL; \ + *post_ptr++ = c; \ + } while (0) + +#define EMIT_MBYTE(c) \ + len = (*mb_char2bytes)(c, buf); \ + EMIT(buf[0]); \ + for (i = 1; i < len; i++) \ + { \ + EMIT(buf[i]); \ + EMIT(NFA_CONCAT); \ + } \ + EMIT(NFA_MULTIBYTE); + +#define EMIT_COMPOSING_UTF(input) \ + len = utfc_ptr2len(input); \ + EMIT(input[0]); \ + for (i = 1; i < len; i++) \ + { \ + EMIT(input[i]); \ + EMIT(NFA_CONCAT); \ + } \ + EMIT(NFA_COMPOSING); + +/* + * Initialize internal variables before NFA compilation. + * Return OK on success, FAIL otherwise. + */ + static int +nfa_regcomp_start(expr, re_flags) + char_u *expr; + int re_flags; /* see vim_regcomp() */ +{ + int postfix_size; + + nstate = 0; + istate = 0; + /* A reasonable estimation for size */ + nstate_max = (STRLEN(expr) + 1) * NFA_POSTFIX_MULTIPLIER; + + /* Size for postfix representation of expr */ + postfix_size = sizeof(*post_start) * nstate_max; + post_start = (int *)lalloc(postfix_size, TRUE); + if (post_start == NULL) + return FAIL; + vim_memset(post_start, 0, postfix_size); + post_ptr = post_start; + post_end = post_start + postfix_size; + nfa_has_zend = FALSE; + + regcomp_start(expr, re_flags); + + return OK; +} + +/* + * Search between "start" and "end" and try to recognize a + * character class in expanded form. For example [0-9]. + * On success, return the id the character class to be emitted. + * On failure, return 0 (=FAIL) + * Start points to the first char of the range, while end should point + * to the closing brace. + */ + static int +nfa_recognize_char_class(start, end, extra_newl) + char_u *start; + char_u *end; + int extra_newl; +{ + int i; + /* Each of these variables takes up a char in "config[]", + * in the order they are here. */ + int not = FALSE, af = FALSE, AF = FALSE, az = FALSE, AZ = FALSE, + o7 = FALSE, o9 = FALSE, underscore = FALSE, newl = FALSE; + char_u *p; +#define NCONFIGS 16 + int classid[NCONFIGS] = { + NFA_DIGIT, NFA_NDIGIT, NFA_HEX, NFA_NHEX, + NFA_OCTAL, NFA_NOCTAL, NFA_WORD, NFA_NWORD, + NFA_HEAD, NFA_NHEAD, NFA_ALPHA, NFA_NALPHA, + NFA_LOWER, NFA_NLOWER, NFA_UPPER, NFA_NUPPER + }; + char_u myconfig[9]; + char_u config[NCONFIGS][9] = { + "000000100", /* digit */ + "100000100", /* non digit */ + "011000100", /* hex-digit */ + "111000100", /* non hex-digit */ + "000001000", /* octal-digit */ + "100001000", /* [^0-7] */ + "000110110", /* [0-9A-Za-z_] */ + "100110110", /* [^0-9A-Za-z_] */ + "000110010", /* head of word */ + "100110010", /* not head of word */ + "000110000", /* alphabetic char a-z */ + "100110000", /* non alphabetic char */ + "000100000", /* lowercase letter */ + "100100000", /* non lowercase */ + "000010000", /* uppercase */ + "100010000" /* non uppercase */ + }; + + if (extra_newl == TRUE) + newl = TRUE; + + if (*end != ']') + return FAIL; + p = start; + if (*p == '^') + { + not = TRUE; + p ++; + } + + while (p < end) + { + if (p + 2 < end && *(p + 1) == '-') + { + switch (*p) + { + case '0': + if (*(p + 2) == '9') + { + o9 = TRUE; + break; + } + else + if (*(p + 2) == '7') + { + o7 = TRUE; + break; + } + case 'a': + if (*(p + 2) == 'z') + { + az = TRUE; + break; + } + else + if (*(p + 2) == 'f') + { + af = TRUE; + break; + } + case 'A': + if (*(p + 2) == 'Z') + { + AZ = TRUE; + break; + } + else + if (*(p + 2) == 'F') + { + AF = TRUE; + break; + } + /* FALLTHROUGH */ + default: + return FAIL; + } + p += 3; + } + else if (p + 1 < end && *p == '\\' && *(p + 1) == 'n') + { + newl = TRUE; + p += 2; + } + else if (*p == '_') + { + underscore = TRUE; + p ++; + } + else if (*p == '\n') + { + newl = TRUE; + p ++; + } + else + return FAIL; + } /* while (p < end) */ + + if (p != end) + return FAIL; + + /* build the config that represents the ranges we gathered */ + STRCPY(myconfig, "000000000"); + if (not == TRUE) + myconfig[0] = '1'; + if (af == TRUE) + myconfig[1] = '1'; + if (AF == TRUE) + myconfig[2] = '1'; + if (az == TRUE) + myconfig[3] = '1'; + if (AZ == TRUE) + myconfig[4] = '1'; + if (o7 == TRUE) + myconfig[5] = '1'; + if (o9 == TRUE) + myconfig[6] = '1'; + if (underscore == TRUE) + myconfig[7] = '1'; + if (newl == TRUE) + { + myconfig[8] = '1'; + extra_newl = ADD_NL; + } + /* try to recognize character classes */ + for (i = 0; i < NCONFIGS; i++) + if (STRNCMP(myconfig, config[i],8) == 0) + return classid[i] + extra_newl; + + /* fallthrough => no success so far */ + return FAIL; + +#undef NCONFIGS +} + +/* + * Produce the bytes for equivalence class "c". + * Currently only handles latin1, latin9 and utf-8. + * Emits bytes in postfix notation: 'a,b,NFA_OR,c,NFA_OR' is + * equivalent to 'a OR b OR c' + * + * NOTE! When changing this function, also update reg_equi_class() + */ + static int +nfa_emit_equi_class(c, neg) + int c; + int neg; +{ + int first = TRUE; + int glue = neg == TRUE ? NFA_CONCAT : NFA_OR; +#define EMIT2(c) \ + EMIT(c); \ + if (neg == TRUE) { \ + EMIT(NFA_NOT); \ + } \ + if (first == FALSE) \ + EMIT(glue); \ + else \ + first = FALSE; \ + +#ifdef FEAT_MBYTE + if (enc_utf8 || STRCMP(p_enc, "latin1") == 0 + || STRCMP(p_enc, "iso-8859-15") == 0) +#endif + { + switch (c) + { + case 'A': case '\300': case '\301': case '\302': + case '\303': case '\304': case '\305': + EMIT2('A'); EMIT2('\300'); EMIT2('\301'); + EMIT2('\302'); EMIT2('\303'); EMIT2('\304'); + EMIT2('\305'); + return OK; + + case 'C': case '\307': + EMIT2('C'); EMIT2('\307'); + return OK; + + case 'E': case '\310': case '\311': case '\312': case '\313': + EMIT2('E'); EMIT2('\310'); EMIT2('\311'); + EMIT2('\312'); EMIT2('\313'); + return OK; + + case 'I': case '\314': case '\315': case '\316': case '\317': + EMIT2('I'); EMIT2('\314'); EMIT2('\315'); + EMIT2('\316'); EMIT2('\317'); + return OK; + + case 'N': case '\321': + EMIT2('N'); EMIT2('\321'); + return OK; + + case 'O': case '\322': case '\323': case '\324': case '\325': + case '\326': + EMIT2('O'); EMIT2('\322'); EMIT2('\323'); + EMIT2('\324'); EMIT2('\325'); EMIT2('\326'); + return OK; + + case 'U': case '\331': case '\332': case '\333': case '\334': + EMIT2('U'); EMIT2('\331'); EMIT2('\332'); + EMIT2('\333'); EMIT2('\334'); + return OK; + + case 'Y': case '\335': + EMIT2('Y'); EMIT2('\335'); + return OK; + + case 'a': case '\340': case '\341': case '\342': + case '\343': case '\344': case '\345': + EMIT2('a'); EMIT2('\340'); EMIT2('\341'); + EMIT2('\342'); EMIT2('\343'); EMIT2('\344'); + EMIT2('\345'); + return OK; + + case 'c': case '\347': + EMIT2('c'); EMIT2('\347'); + return OK; + + case 'e': case '\350': case '\351': case '\352': case '\353': + EMIT2('e'); EMIT2('\350'); EMIT2('\351'); + EMIT2('\352'); EMIT2('\353'); + return OK; + + case 'i': case '\354': case '\355': case '\356': case '\357': + EMIT2('i'); EMIT2('\354'); EMIT2('\355'); + EMIT2('\356'); EMIT2('\357'); + return OK; + + case 'n': case '\361': + EMIT2('n'); EMIT2('\361'); + return OK; + + case 'o': case '\362': case '\363': case '\364': case '\365': + case '\366': + EMIT2('o'); EMIT2('\362'); EMIT2('\363'); + EMIT2('\364'); EMIT2('\365'); EMIT2('\366'); + return OK; + + case 'u': case '\371': case '\372': case '\373': case '\374': + EMIT2('u'); EMIT2('\371'); EMIT2('\372'); + EMIT2('\373'); EMIT2('\374'); + return OK; + + case 'y': case '\375': case '\377': + EMIT2('y'); EMIT2('\375'); EMIT2('\377'); + return OK; + + default: + return FAIL; + } + } + + EMIT(c); + return OK; +#undef EMIT2 +} + +/* + * Code to parse regular expression. + * + * We try to reuse parsing functions in regexp.c to + * minimize surprise and keep the syntax consistent. + */ + +/* + * Increments the pointer "p" by one (multi-byte) character. + */ + static void +nfa_inc(p) + char_u **p; +{ +#ifdef FEAT_MBYTE + if (has_mbyte) + mb_ptr2char_adv(p); + else +#endif + *p = *p + 1; +} + +/* + * Decrements the pointer "p" by one (multi-byte) character. + */ + static void +nfa_dec(p) + char_u **p; +{ +#ifdef FEAT_MBYTE + char_u *p2, *oldp; + + if (has_mbyte) + { + oldp = *p; + /* Try to find the multibyte char that advances to the current + * position. */ + do + { + *p = *p - 1; + p2 = *p; + mb_ptr2char_adv(&p2); + } while (p2 != oldp); + } +#else + *p = *p - 1; +#endif +} + +/* + * Parse the lowest level. + * + * An atom can be one of a long list of items. Many atoms match one character + * in the text. It is often an ordinary character or a character class. + * Braces can be used to make a pattern into an atom. The "\z(\)" construct + * is only for syntax highlighting. + * + * atom ::= ordinary-atom + * or \( pattern \) + * or \%( pattern \) + * or \z( pattern \) + */ + static int +nfa_regatom() +{ + int c; + int charclass; + int equiclass; + int collclass; + int got_coll_char; + char_u *p; + char_u *endp; +#ifdef FEAT_MBYTE + char_u *old_regparse = regparse; + int clen; + int len; + static char_u buf[30]; + int i; +#endif + int extra = 0; + int first; + int emit_range; + int negated; + int result; + int startc = -1; + int endc = -1; + int oldstartc = -1; + int cpo_lit; /* 'cpoptions' contains 'l' flag */ + int cpo_bsl; /* 'cpoptions' contains '\' flag */ + int glue; /* ID that will "glue" nodes together */ + + cpo_lit = vim_strchr(p_cpo, CPO_LITERAL) != NULL; + cpo_bsl = vim_strchr(p_cpo, CPO_BACKSL) != NULL; + + c = getchr(); + +#ifdef FEAT_MBYTE + /* clen has the length of the current char, without composing chars */ + clen = (*mb_char2len)(c); + if (has_mbyte && clen > 1) + goto nfa_do_multibyte; +#endif + switch (c) + { + case Magic('^'): + EMIT(NFA_BOL); + break; + + case Magic('$'): + EMIT(NFA_EOL); +#if defined(FEAT_SYN_HL) || defined(PROTO) + had_eol = TRUE; +#endif + break; + + case Magic('<'): + EMIT(NFA_BOW); + break; + + case Magic('>'): + EMIT(NFA_EOW); + break; + + case Magic('_'): + c = no_Magic(getchr()); + if (c == '^') /* "\_^" is start-of-line */ + { + EMIT(NFA_BOL); + break; + } + if (c == '$') /* "\_$" is end-of-line */ + { + EMIT(NFA_EOL); +#if defined(FEAT_SYN_HL) || defined(PROTO) + had_eol = TRUE; +#endif + break; + } + + extra = ADD_NL; + + /* "\_[" is collection plus newline */ + if (c == '[') + /* TODO: make this work + * goto collection; */ + return FAIL; + + /* "\_x" is character class plus newline */ + /*FALLTHROUGH*/ + + /* + * Character classes. + */ + case Magic('.'): + case Magic('i'): + case Magic('I'): + case Magic('k'): + case Magic('K'): + case Magic('f'): + case Magic('F'): + case Magic('p'): + case Magic('P'): + case Magic('s'): + case Magic('S'): + case Magic('d'): + case Magic('D'): + case Magic('x'): + case Magic('X'): + case Magic('o'): + case Magic('O'): + case Magic('w'): + case Magic('W'): + case Magic('h'): + case Magic('H'): + case Magic('a'): + case Magic('A'): + case Magic('l'): + case Magic('L'): + case Magic('u'): + case Magic('U'): + p = vim_strchr(classchars, no_Magic(c)); + if (p == NULL) + { + return FAIL; /* runtime error */ + } +#ifdef FEAT_MBYTE + /* When '.' is followed by a composing char ignore the dot, so that + * the composing char is matched here. */ + if (enc_utf8 && c == Magic('.') && utf_iscomposing(peekchr())) + { + c = getchr(); + goto nfa_do_multibyte; + } +#endif + EMIT(nfa_classcodes[p - classchars]); + if (extra == ADD_NL) + { + EMIT(NFA_NEWL); + EMIT(NFA_OR); + regflags |= RF_HASNL; + } + break; + + case Magic('n'): + if (reg_string) + /* In a string "\n" matches a newline character. */ + EMIT(NL); + else + { + /* In buffer text "\n" matches the end of a line. */ + EMIT(NFA_NEWL); + regflags |= RF_HASNL; + } + break; + + case Magic('('): + if (nfa_reg(REG_PAREN) == FAIL) + return FAIL; /* cascaded error */ + break; + + case NUL: + syntax_error = TRUE; + EMSG_RET_FAIL(_("E865: (NFA) Regexp end encountered prematurely")); + + case Magic('|'): + case Magic('&'): + case Magic(')'): + syntax_error = TRUE; + EMSG2(_(e_misplaced), no_Magic(c)); + return FAIL; + + case Magic('='): + case Magic('?'): + case Magic('+'): + case Magic('@'): + case Magic('*'): + case Magic('{'): + /* these should follow an atom, not form an atom */ + syntax_error = TRUE; + EMSG2(_(e_misplaced), no_Magic(c)); + return FAIL; + + case Magic('~'): /* previous substitute pattern */ + /* Not supported yet */ + return FAIL; + + case Magic('1'): + case Magic('2'): + case Magic('3'): + case Magic('4'): + case Magic('5'): + case Magic('6'): + case Magic('7'): + case Magic('8'): + case Magic('9'): + /* not supported yet */ + return FAIL; + + case Magic('z'): + c = no_Magic(getchr()); + switch (c) + { + case 's': + EMIT(NFA_ZSTART); + break; + case 'e': + EMIT(NFA_ZEND); + nfa_has_zend = TRUE; + /* TODO: Currently \ze does not work properly. */ + return FAIL; + /* break; */ + case '1': + case '2': + case '3': + case '4': + case '5': + case '6': + case '7': + case '8': + case '9': + case '(': + /* \z1...\z9 and \z( not yet supported */ + return FAIL; + default: + syntax_error = TRUE; + EMSG2(_("E867: (NFA) Unknown operator '\\z%c'"), + no_Magic(c)); + return FAIL; + } + break; + + case Magic('%'): + c = no_Magic(getchr()); + switch (c) + { + /* () without a back reference */ + case '(': + if (nfa_reg(REG_NPAREN) == FAIL) + return FAIL; + EMIT(NFA_NOPEN); + break; + + case 'd': /* %d123 decimal */ + case 'o': /* %o123 octal */ + case 'x': /* %xab hex 2 */ + case 'u': /* %uabcd hex 4 */ + case 'U': /* %U1234abcd hex 8 */ + /* Not yet supported */ + return FAIL; + + c = coll_get_char(); +#ifdef FEAT_MBYTE + if ((*mb_char2len)(c) > 1) + { + EMIT_MBYTE(c); + } + else +#endif + EMIT(c); + break; + + /* Catch \%^ and \%$ regardless of where they appear in the + * pattern -- regardless of whether or not it makes sense. */ + case '^': + EMIT(NFA_BOF); + /* Not yet supported */ + return FAIL; + break; + + case '$': + EMIT(NFA_EOF); + /* Not yet supported */ + return FAIL; + break; + + case '#': + /* not supported yet */ + return FAIL; + break; + + case 'V': + /* not supported yet */ + return FAIL; + break; + + case '[': + /* \%[abc] not supported yet */ + return FAIL; + + default: + /* not supported yet */ + return FAIL; + } + break; + +/* collection: */ + case Magic('['): + /* + * Glue is emitted between several atoms from the []. + * It is either NFA_OR, or NFA_CONCAT. + * + * [abc] expands to 'a b NFA_OR c NFA_OR' (in postfix notation) + * [^abc] expands to 'a NFA_NOT b NFA_NOT NFA_CONCAT c NFA_NOT + * NFA_CONCAT NFA_END_NEG_RANGE NFA_CONCAT' (in postfix + * notation) + * + */ + + +/* Emit negation atoms, if needed. + * The CONCAT below merges the NOT with the previous node. */ +#define TRY_NEG() \ + if (negated == TRUE) \ + { \ + EMIT(NFA_NOT); \ + } + +/* Emit glue between important nodes : CONCAT or OR. */ +#define EMIT_GLUE() \ + if (first == FALSE) \ + EMIT(glue); \ + else \ + first = FALSE; + + p = regparse; + endp = skip_anyof(p); + if (*endp == ']') + { + /* + * Try to reverse engineer character classes. For example, + * recognize that [0-9] stands for \d and [A-Za-z_] with \h, + * and perform the necessary substitutions in the NFA. + */ + result = nfa_recognize_char_class(regparse, endp, + extra == ADD_NL); + if (result != FAIL) + { + if (result >= NFA_DIGIT && result <= NFA_NUPPER) + EMIT(result); + else /* must be char class + newline */ + { + EMIT(result - ADD_NL); + EMIT(NFA_NEWL); + EMIT(NFA_OR); + } + regparse = endp; + nfa_inc(®parse); + return OK; + } + /* + * Failed to recognize a character class. Use the simple + * version that turns [abc] into 'a' OR 'b' OR 'c' + */ + startc = endc = oldstartc = -1; + first = TRUE; /* Emitting first atom in this sequence? */ + negated = FALSE; + glue = NFA_OR; + if (*regparse == '^') /* negated range */ + { + negated = TRUE; + glue = NFA_CONCAT; + nfa_inc(®parse); + } + if (*regparse == '-') + { + startc = '-'; + EMIT(startc); + TRY_NEG(); + EMIT_GLUE(); + nfa_inc(®parse); + } + /* Emit the OR branches for each character in the [] */ + emit_range = FALSE; + while (regparse < endp) + { + oldstartc = startc; + startc = -1; + got_coll_char = FALSE; + if (*regparse == '[') + { + /* Check for [: :], [= =], [. .] */ + equiclass = collclass = 0; + charclass = get_char_class(®parse); + if (charclass == CLASS_NONE) + { + equiclass = get_equi_class(®parse); + if (equiclass == 0) + collclass = get_coll_element(®parse); + } + + /* Character class like [:alpha:] */ + if (charclass != CLASS_NONE) + { + switch (charclass) + { + case CLASS_ALNUM: + EMIT(NFA_CLASS_ALNUM); + break; + case CLASS_ALPHA: + EMIT(NFA_CLASS_ALPHA); + break; + case CLASS_BLANK: + EMIT(NFA_CLASS_BLANK); + break; + case CLASS_CNTRL: + EMIT(NFA_CLASS_CNTRL); + break; + case CLASS_DIGIT: + EMIT(NFA_CLASS_DIGIT); + break; + case CLASS_GRAPH: + EMIT(NFA_CLASS_GRAPH); + break; + case CLASS_LOWER: + EMIT(NFA_CLASS_LOWER); + break; + case CLASS_PRINT: + EMIT(NFA_CLASS_PRINT); + break; + case CLASS_PUNCT: + EMIT(NFA_CLASS_PUNCT); + break; + case CLASS_SPACE: + EMIT(NFA_CLASS_SPACE); + break; + case CLASS_UPPER: + EMIT(NFA_CLASS_UPPER); + break; + case CLASS_XDIGIT: + EMIT(NFA_CLASS_XDIGIT); + break; + case CLASS_TAB: + EMIT(NFA_CLASS_TAB); + break; + case CLASS_RETURN: + EMIT(NFA_CLASS_RETURN); + break; + case CLASS_BACKSPACE: + EMIT(NFA_CLASS_BACKSPACE); + break; + case CLASS_ESCAPE: + EMIT(NFA_CLASS_ESCAPE); + break; + } + TRY_NEG(); + EMIT_GLUE(); + continue; + } + /* Try equivalence class [=a=] and the like */ + if (equiclass != 0) + { + result = nfa_emit_equi_class(equiclass, negated); + if (result == FAIL) + { + /* should never happen */ + EMSG_RET_FAIL(_("E868: Error building NFA with equivalence class!")); + } + EMIT_GLUE(); + continue; + } + /* Try collating class like [. .] */ + if (collclass != 0) + { + startc = collclass; /* allow [.a.]-x as a range */ + /* Will emit the proper atom at the end of the + * while loop. */ + } + } + /* Try a range like 'a-x' or '\t-z' */ + if (*regparse == '-') + { + emit_range = TRUE; + startc = oldstartc; + nfa_inc(®parse); + continue; /* reading the end of the range */ + } + + /* Now handle simple and escaped characters. + * Only "\]", "\^", "\]" and "\\" are special in Vi. Vim + * accepts "\t", "\e", etc., but only when the 'l' flag in + * 'cpoptions' is not included. + * Posix doesn't recognize backslash at all. + */ + if (*regparse == '\\' + && !cpo_bsl + && regparse + 1 <= endp + && (vim_strchr(REGEXP_INRANGE, regparse[1]) != NULL + || (!cpo_lit + && vim_strchr(REGEXP_ABBR, regparse[1]) + != NULL) + ) + ) + { + nfa_inc(®parse); + + if (*regparse == 'n' || *regparse == 'n') + startc = reg_string ? NL : NFA_NEWL; + else + if (*regparse == 'd' + || *regparse == 'o' + || *regparse == 'x' + || *regparse == 'u' + || *regparse == 'U' + ) + { + /* TODO(RE) This needs more testing */ + startc = coll_get_char(); + got_coll_char = TRUE; + nfa_dec(®parse); + } + else + { + /* \r,\t,\e,\b */ + startc = backslash_trans(*regparse); + } + } + + /* Normal printable char */ + if (startc == -1) +#ifdef FEAT_MBYTE + startc = (*mb_ptr2char)(regparse); +#else + startc = *regparse; +#endif + + /* Previous char was '-', so this char is end of range. */ + if (emit_range) + { + endc = startc; startc = oldstartc; + if (startc > endc) + EMSG_RET_FAIL(_(e_invrange)); +#ifdef FEAT_MBYTE + if (has_mbyte && ((*mb_char2len)(startc) > 1 + || (*mb_char2len)(endc) > 1)) + { + if (endc > startc + 256) + EMSG_RET_FAIL(_(e_invrange)); + /* Emit the range. "startc" was already emitted, so + * skip it. */ + for (c = startc + 1; c <= endc; c++) + { + if ((*mb_char2len)(c) > 1) + { + EMIT_MBYTE(c); + } + else + EMIT(c); + TRY_NEG(); + EMIT_GLUE(); + } + emit_range = FALSE; + } + else +#endif + { +#ifdef EBCDIC + int alpha_only = FALSE; + + /* for alphabetical range skip the gaps + * 'i'-'j', 'r'-'s', 'I'-'J' and 'R'-'S'. */ + if (isalpha(startc) && isalpha(endc)) + alpha_only = TRUE; +#endif + /* Emit the range. "startc" was already emitted, so + * skip it. */ + for (c = startc + 1; c <= endc; c++) +#ifdef EBCDIC + if (!alpha_only || isalpha(startc)) +#endif + { + EMIT(c); + TRY_NEG(); + EMIT_GLUE(); + } + emit_range = FALSE; + } + } + else + { + /* + * This char (startc) is not part of a range. Just + * emit it. + * + * Normally, simply emit startc. But if we get char + * code=0 from a collating char, then replace it with + * 0x0a. + * + * This is needed to completely mimic the behaviour of + * the backtracking engine. + */ + if (got_coll_char == TRUE && startc == 0) + EMIT(0x0a); + else +#ifdef FEAT_MBYTE + if ((*mb_char2len)(startc) > 1) + { + EMIT_MBYTE(startc); + } + else +#endif + EMIT(startc); + TRY_NEG(); + EMIT_GLUE(); + } + + nfa_inc(®parse); + } /* while (p < endp) */ + + nfa_dec(®parse); + if (*regparse == '-') /* if last, '-' is just a char */ + { + EMIT('-'); + TRY_NEG(); + EMIT_GLUE(); + } + nfa_inc(®parse); + + if (extra == ADD_NL) /* \_[] also matches \n */ + { + EMIT(reg_string ? NL : NFA_NEWL); + TRY_NEG(); + EMIT_GLUE(); + } + + /* skip the trailing ] */ + regparse = endp; + nfa_inc(®parse); + if (negated == TRUE) + { + /* Mark end of negated char range */ + EMIT(NFA_END_NEG_RANGE); + EMIT(NFA_CONCAT); + } + return OK; + } /* if exists closing ] */ + else if (reg_strict) + { + syntax_error = TRUE; + EMSG_RET_FAIL(_(e_missingbracket)); + } + + /* FALLTHROUGH */ + default: + { +#ifdef FEAT_MBYTE + int plen; + +nfa_do_multibyte: + /* length of current char, with composing chars, + * from pointer */ + plen = (*mb_ptr2len)(old_regparse); + if (enc_utf8 && clen != plen) + { + /* A composing character is always handled as a + * separate atom, surrounded by NFA_COMPOSING and + * NFA_END_COMPOSING. Note that right now we are + * building the postfix form, not the NFA itself; + * a composing char could be: a, b, c, NFA_COMPOSING + * where 'a', 'b', 'c' are chars with codes > 256. + */ + EMIT_COMPOSING_UTF(old_regparse); + regparse = old_regparse + plen; + } + else + /* A multi-byte character is always handled as a + * separate atom, surrounded by NFA_MULTIBYTE and + * NFA_END_MULTIBYTE */ + if (plen > 1) + { + EMIT_MBYTE(c); + } + else +#endif + { + c = no_Magic(c); + EMIT(c); + } + return OK; + } + } + +#undef TRY_NEG +#undef EMIT_GLUE + + return OK; +} + +/* + * Parse something followed by possible [*+=]. + * + * A piece is an atom, possibly followed by a multi, an indication of how many + * times the atom can be matched. Example: "a*" matches any sequence of "a" + * characters: "", "a", "aa", etc. + * + * piece ::= atom + * or atom multi + */ + static int +nfa_regpiece() +{ + int i; + int op; + int ret; + long minval, maxval; + int greedy = TRUE; /* Braces are prefixed with '-' ? */ + char_u *old_regparse, *new_regparse; + int c2; + int *old_post_ptr, *my_post_start; + int old_regnpar; + int quest; + + /* Save the current position in the regexp, so that we can use it if + * <atom>{m,n} is next. */ + old_regparse = regparse; + /* Save current number of open parenthesis, so we can use it if + * <atom>{m,n} is next */ + old_regnpar = regnpar; + /* store current pos in the postfix form, for \{m,n} involving 0s */ + my_post_start = post_ptr; + + ret = nfa_regatom(); + if (ret == FAIL) + return FAIL; /* cascaded error */ + + op = peekchr(); + if (re_multi_type(op) == NOT_MULTI) + return OK; + + skipchr(); + switch (op) + { + case Magic('*'): + EMIT(NFA_STAR); + break; + + case Magic('+'): + /* + * Trick: Normally, (a*)\+ would match the whole input "aaa". The + * first and only submatch would be "aaa". But the backtracking + * engine interprets the plus as "try matching one more time", and + * a* matches a second time at the end of the input, the empty + * string. + * The submatch will the empty string. + * + * In order to be consistent with the old engine, we disable + * NFA_PLUS, and replace <atom>+ with <atom><atom>* + */ + /* EMIT(NFA_PLUS); */ + regnpar = old_regnpar; + regparse = old_regparse; + curchr = -1; + if (nfa_regatom() == FAIL) + return FAIL; + EMIT(NFA_STAR); + EMIT(NFA_CONCAT); + skipchr(); /* skip the \+ */ + break; + + case Magic('@'): + op = no_Magic(getchr()); + switch(op) + { + case '=': + EMIT(NFA_PREV_ATOM_NO_WIDTH); + break; + case '!': + case '<': + case '>': + /* Not supported yet */ + return FAIL; + default: + syntax_error = TRUE; + EMSG2(_("E869: (NFA) Unknown operator '\\@%c'"), op); + return FAIL; + } + break; + + case Magic('?'): + case Magic('='): + EMIT(NFA_QUEST); + break; + + case Magic('{'): + /* a{2,5} will expand to 'aaa?a?a?' + * a{-1,3} will expand to 'aa??a??', where ?? is the nongreedy + * version of '?' + * \v(ab){2,3} will expand to '(ab)(ab)(ab)?', where all the + * parenthesis have the same id + */ + + greedy = TRUE; + c2 = peekchr(); + if (c2 == '-' || c2 == Magic('-')) + { + skipchr(); + greedy = FALSE; + } + if (!read_limits(&minval, &maxval)) + { + syntax_error = TRUE; + EMSG_RET_FAIL(_("E870: (NFA regexp) Error reading repetition limits")); + } + /* <atom>{0,inf}, <atom>{0,} and <atom>{} are equivalent to + * <atom>* */ + if (minval == 0 && maxval == MAX_LIMIT && greedy) + { + EMIT(NFA_STAR); + break; + } + + if (maxval > NFA_BRACES_MAXLIMIT) + { + /* This would yield a huge automaton and use too much memory. + * Revert to old engine */ + return FAIL; + } + + /* Special case: x{0} or x{-0} */ + if (maxval == 0) + { + /* Ignore result of previous call to nfa_regatom() */ + post_ptr = my_post_start; + /* NFA_SKIP_CHAR has 0-length and works everywhere */ + EMIT(NFA_SKIP_CHAR); + return OK; + } + + /* Ignore previous call to nfa_regatom() */ + post_ptr = my_post_start; + /* Save pos after the repeated atom and the \{} */ + new_regparse = regparse; + + new_regparse = regparse; + quest = (greedy == TRUE? NFA_QUEST : NFA_QUEST_NONGREEDY); + for (i = 0; i < maxval; i++) + { + /* Goto beginning of the repeated atom */ + regparse = old_regparse; + curchr = -1; + /* Restore count of parenthesis */ + regnpar = old_regnpar; + old_post_ptr = post_ptr; + if (nfa_regatom() == FAIL) + return FAIL; + /* after "minval" times, atoms are optional */ + if (i + 1 > minval) + EMIT(quest); + if (old_post_ptr != my_post_start) + EMIT(NFA_CONCAT); + } + + /* Go to just after the repeated atom and the \{} */ + regparse = new_regparse; + curchr = -1; + + break; + + + default: + break; + } /* end switch */ + + if (re_multi_type(peekchr()) != NOT_MULTI) + { + /* Can't have a multi follow a multi. */ + syntax_error = TRUE; + EMSG_RET_FAIL(_("E871: (NFA regexp) Can't have a multi follow a multi !")); + } + + return OK; +} + +/* + * Parse one or more pieces, concatenated. It matches a match for the + * first piece, followed by a match for the second piece, etc. Example: + * "f[0-9]b", first matches "f", then a digit and then "b". + * + * concat ::= piece + * or piece piece + * or piece piece piece + * etc. + */ + static int +nfa_regconcat() +{ + int cont = TRUE; + int first = TRUE; + + while (cont) + { + switch (peekchr()) + { + case NUL: + case Magic('|'): + case Magic('&'): + case Magic(')'): + cont = FALSE; + break; + + case Magic('Z'): +#ifdef FEAT_MBYTE + regflags |= RF_ICOMBINE; +#endif + skipchr_keepstart(); + break; + case Magic('c'): + regflags |= RF_ICASE; + skipchr_keepstart(); + break; + case Magic('C'): + regflags |= RF_NOICASE; + skipchr_keepstart(); + break; + case Magic('v'): + reg_magic = MAGIC_ALL; + skipchr_keepstart(); + curchr = -1; + break; + case Magic('m'): + reg_magic = MAGIC_ON; + skipchr_keepstart(); + curchr = -1; + break; + case Magic('M'): + reg_magic = MAGIC_OFF; + skipchr_keepstart(); + curchr = -1; + break; + case Magic('V'): + reg_magic = MAGIC_NONE; + skipchr_keepstart(); + curchr = -1; + break; + + default: + if (nfa_regpiece() == FAIL) + return FAIL; + if (first == FALSE) + EMIT(NFA_CONCAT); + else + first = FALSE; + break; + } + } + + return OK; +} + +/* + * Parse a branch, one or more concats, separated by "\&". It matches the + * last concat, but only if all the preceding concats also match at the same + * position. Examples: + * "foobeep\&..." matches "foo" in "foobeep". + * ".*Peter\&.*Bob" matches in a line containing both "Peter" and "Bob" + * + * branch ::= concat + * or concat \& concat + * or concat \& concat \& concat + * etc. + */ + static int +nfa_regbranch() +{ + int ch; + int *old_post_ptr; + + old_post_ptr = post_ptr; + + /* First branch, possibly the only one */ + if (nfa_regconcat() == FAIL) + return FAIL; + + ch = peekchr(); + /* Try next concats */ + while (ch == Magic('&')) + { + skipchr(); + EMIT(NFA_NOPEN); + EMIT(NFA_PREV_ATOM_NO_WIDTH); + old_post_ptr = post_ptr; + if (nfa_regconcat() == FAIL) + return FAIL; + /* if concat is empty, skip a input char. But do emit a node */ + if (old_post_ptr == post_ptr) + EMIT(NFA_SKIP_CHAR); + EMIT(NFA_CONCAT); + ch = peekchr(); + } + + /* Even if a branch is empty, emit one node for it */ + if (old_post_ptr == post_ptr) + EMIT(NFA_SKIP_CHAR); + + return OK; +} + +/* + * Parse a pattern, one or more branches, separated by "\|". It matches + * anything that matches one of the branches. Example: "foo\|beep" matches + * "foo" and matches "beep". If more than one branch matches, the first one + * is used. + * + * pattern ::= branch + * or branch \| branch + * or branch \| branch \| branch + * etc. + */ + static int +nfa_reg(paren) + int paren; /* REG_NOPAREN, REG_PAREN, REG_NPAREN or REG_ZPAREN */ +{ + int parno = 0; + +#ifdef FEAT_SYN_HL +#endif + if (paren == REG_PAREN) + { + if (regnpar >= NSUBEXP) /* Too many `(' */ + { + syntax_error = TRUE; + EMSG_RET_FAIL(_("E872: (NFA regexp) Too many '('")); + } + parno = regnpar++; + } + + if (nfa_regbranch() == FAIL) + return FAIL; /* cascaded error */ + + while (peekchr() == Magic('|')) + { + skipchr(); + if (nfa_regbranch() == FAIL) + return FAIL; /* cascaded error */ + EMIT(NFA_OR); + } + + /* Check for proper termination. */ + if (paren != REG_NOPAREN && getchr() != Magic(')')) + { + syntax_error = TRUE; + if (paren == REG_NPAREN) + EMSG2_RET_FAIL(_(e_unmatchedpp), reg_magic == MAGIC_ALL); + else + EMSG2_RET_FAIL(_(e_unmatchedp), reg_magic == MAGIC_ALL); + } + else if (paren == REG_NOPAREN && peekchr() != NUL) + { + syntax_error = TRUE; + if (peekchr() == Magic(')')) + EMSG2_RET_FAIL(_(e_unmatchedpar), reg_magic == MAGIC_ALL); + else + EMSG_RET_FAIL(_("E873: (NFA regexp) proper termination error")); + } + /* + * Here we set the flag allowing back references to this set of + * parentheses. + */ + if (paren == REG_PAREN) + { + had_endbrace[parno] = TRUE; /* have seen the close paren */ + EMIT(NFA_MOPEN + parno); + } + + return OK; +} + +typedef struct +{ + char_u *start[NSUBEXP]; + char_u *end[NSUBEXP]; + lpos_T startpos[NSUBEXP]; + lpos_T endpos[NSUBEXP]; +} regsub_T; + +static int nfa_regmatch __ARGS((nfa_state_T *start, regsub_T *submatch, regsub_T *m)); + +#ifdef DEBUG +static char_u code[50]; + + static void +nfa_set_code(c) + int c; +{ + int addnl = FALSE; + + if (c >= NFA_FIRST_NL && c <= NFA_LAST_NL) + { + addnl = TRUE; + c -= ADD_NL; + } + + STRCPY(code, ""); + switch (c) + { + case NFA_MATCH: STRCPY(code, "NFA_MATCH "); break; + case NFA_SPLIT: STRCPY(code, "NFA_SPLIT "); break; + case NFA_CONCAT: STRCPY(code, "NFA_CONCAT "); break; + case NFA_NEWL: STRCPY(code, "NFA_NEWL "); break; + case NFA_ZSTART: STRCPY(code, "NFA_ZSTART"); break; + case NFA_ZEND: STRCPY(code, "NFA_ZEND"); break; + + case NFA_PREV_ATOM_NO_WIDTH: + STRCPY(code, "NFA_PREV_ATOM_NO_WIDTH"); break; + case NFA_NOPEN: STRCPY(code, "NFA_MOPEN_INVISIBLE"); break; + case NFA_NCLOSE: STRCPY(code, "NFA_MCLOSE_INVISIBLE"); break; + case NFA_START_INVISIBLE: STRCPY(code, "NFA_START_INVISIBLE"); break; + case NFA_END_INVISIBLE: STRCPY(code, "NFA_END_INVISIBLE"); break; + + case NFA_MULTIBYTE: STRCPY(code, "NFA_MULTIBYTE"); break; + case NFA_END_MULTIBYTE: STRCPY(code, "NFA_END_MULTIBYTE"); break; + + case NFA_COMPOSING: STRCPY(code, "NFA_COMPOSING"); break; + case NFA_END_COMPOSING: STRCPY(code, "NFA_END_COMPOSING"); break; + + case NFA_MOPEN + 0: + case NFA_MOPEN + 1: + case NFA_MOPEN + 2: + case NFA_MOPEN + 3: + case NFA_MOPEN + 4: + case NFA_MOPEN + 5: + case NFA_MOPEN + 6: + case NFA_MOPEN + 7: + case NFA_MOPEN + 8: + case NFA_MOPEN + 9: + STRCPY(code, "NFA_MOPEN(x)"); + code[10] = c - NFA_MOPEN + '0'; + break; + case NFA_MCLOSE + 0: + case NFA_MCLOSE + 1: + case NFA_MCLOSE + 2: + case NFA_MCLOSE + 3: + case NFA_MCLOSE + 4: + case NFA_MCLOSE + 5: + case NFA_MCLOSE + 6: + case NFA_MCLOSE + 7: + case NFA_MCLOSE + 8: + case NFA_MCLOSE + 9: + STRCPY(code, "NFA_MCLOSE(x)"); + code[11] = c - NFA_MCLOSE + '0'; + break; + case NFA_EOL: STRCPY(code, "NFA_EOL "); break; + case NFA_BOL: STRCPY(code, "NFA_BOL "); break; + case NFA_EOW: STRCPY(code, "NFA_EOW "); break; + case NFA_BOW: STRCPY(code, "NFA_BOW "); break; + case NFA_STAR: STRCPY(code, "NFA_STAR "); break; + case NFA_PLUS: STRCPY(code, "NFA_PLUS "); break; + case NFA_NOT: STRCPY(code, "NFA_NOT "); break; + case NFA_SKIP_CHAR: STRCPY(code, "NFA_SKIP_CHAR"); break; + case NFA_OR: STRCPY(code, "NFA_OR"); break; + case NFA_QUEST: STRCPY(code, "NFA_QUEST"); break; + case NFA_QUEST_NONGREEDY: STRCPY(code, "NFA_QUEST_NON_GREEDY"); break; + case NFA_END_NEG_RANGE: STRCPY(code, "NFA_END_NEG_RANGE"); break; + case NFA_CLASS_ALNUM: STRCPY(code, "NFA_CLASS_ALNUM"); break; + case NFA_CLASS_ALPHA: STRCPY(code, "NFA_CLASS_ALPHA"); break; + case NFA_CLASS_BLANK: STRCPY(code, "NFA_CLASS_BLANK"); break; + case NFA_CLASS_CNTRL: STRCPY(code, "NFA_CLASS_CNTRL"); break; + case NFA_CLASS_DIGIT: STRCPY(code, "NFA_CLASS_DIGIT"); break; + case NFA_CLASS_GRAPH: STRCPY(code, "NFA_CLASS_GRAPH"); break; + case NFA_CLASS_LOWER: STRCPY(code, "NFA_CLASS_LOWER"); break; + case NFA_CLASS_PRINT: STRCPY(code, "NFA_CLASS_PRINT"); break; + case NFA_CLASS_PUNCT: STRCPY(code, "NFA_CLASS_PUNCT"); break; + case NFA_CLASS_SPACE: STRCPY(code, "NFA_CLASS_SPACE"); break; + case NFA_CLASS_UPPER: STRCPY(code, "NFA_CLASS_UPPER"); break; + case NFA_CLASS_XDIGIT: STRCPY(code, "NFA_CLASS_XDIGIT"); break; + case NFA_CLASS_TAB: STRCPY(code, "NFA_CLASS_TAB"); break; + case NFA_CLASS_RETURN: STRCPY(code, "NFA_CLASS_RETURN"); break; + case NFA_CLASS_BACKSPACE: STRCPY(code, "NFA_CLASS_BACKSPACE"); break; + case NFA_CLASS_ESCAPE: STRCPY(code, "NFA_CLASS_ESCAPE"); break; + + case NFA_ANY: STRCPY(code, "NFA_ANY"); break; + case NFA_IDENT: STRCPY(code, "NFA_IDENT"); break; + case NFA_SIDENT:STRCPY(code, "NFA_SIDENT"); break; + case NFA_KWORD: STRCPY(code, "NFA_KWORD"); break; + case NFA_SKWORD:STRCPY(code, "NFA_SKWORD"); break; + case NFA_FNAME: STRCPY(code, "NFA_FNAME"); break; + case NFA_SFNAME:STRCPY(code, "NFA_SFNAME"); break; + case NFA_PRINT: STRCPY(code, "NFA_PRINT"); break; + case NFA_SPRINT:STRCPY(code, "NFA_SPRINT"); break; + case NFA_WHITE: STRCPY(code, "NFA_WHITE"); break; + case NFA_NWHITE:STRCPY(code, "NFA_NWHITE"); break; + case NFA_DIGIT: STRCPY(code, "NFA_DIGIT"); break; + case NFA_NDIGIT:STRCPY(code, "NFA_NDIGIT"); break; + case NFA_HEX: STRCPY(code, "NFA_HEX"); break; + case NFA_NHEX: STRCPY(code, "NFA_NHEX"); break; + case NFA_OCTAL: STRCPY(code, "NFA_OCTAL"); break; + case NFA_NOCTAL:STRCPY(code, "NFA_NOCTAL"); break; + case NFA_WORD: STRCPY(code, "NFA_WORD"); break; + case NFA_NWORD: STRCPY(code, "NFA_NWORD"); break; + case NFA_HEAD: STRCPY(code, "NFA_HEAD"); break; + case NFA_NHEAD: STRCPY(code, "NFA_NHEAD"); break; + case NFA_ALPHA: STRCPY(code, "NFA_ALPHA"); break; + case NFA_NALPHA:STRCPY(code, "NFA_NALPHA"); break; + case NFA_LOWER: STRCPY(code, "NFA_LOWER"); break; + case NFA_NLOWER:STRCPY(code, "NFA_NLOWER"); break; + case NFA_UPPER: STRCPY(code, "NFA_UPPER"); break; + case NFA_NUPPER:STRCPY(code, "NFA_NUPPER"); break; + + default: + STRCPY(code, "CHAR(x)"); + code[5] = c; + } + + if (addnl == TRUE) + STRCAT(code, " + NEWLINE "); + +} + +#ifdef ENABLE_LOG +static FILE *log_fd; + +/* + * Print the postfix notation of the current regexp. + */ + static void +nfa_postfix_dump(expr, retval) + char_u *expr; + int retval; +{ + int *p; + FILE *f; + + f = fopen("LOG.log", "a"); + if (f != NULL) + { + fprintf(f, "\n-------------------------\n"); + if (retval == FAIL) + fprintf(f, ">>> NFA engine failed ... \n"); + else if (retval == OK) + fprintf(f, ">>> NFA engine succeeded !\n"); + fprintf(f, "Regexp: \"%s\"\nPostfix notation (char): \"", expr); + for (p=post_start; *p; p++) + { + nfa_set_code(*p); + fprintf(f, "%s, ", code); + } + fprintf(f, "\"\nPostfix notation (int): "); + for (p=post_start; *p; p++) + fprintf(f, "%d ", *p); + fprintf(f, "\n\n"); + fclose(f); + } +} + +/* + * Print the NFA starting with a root node "state". + */ + static void +nfa_print_state(debugf, state, ident) + FILE *debugf; + nfa_state_T *state; + int ident; +{ + int i; + + if (state == NULL) + return; + + fprintf(debugf, "(%2d)", abs(state->id)); + for (i = 0; i < ident; i++) + fprintf(debugf, "%c", ' '); + + nfa_set_code(state->c); + fprintf(debugf, "%s %s (%d) (id=%d)\n", + state->negated ? "NOT" : "", code, state->c, abs(state->id)); + if (state->id < 0) + return; + + state->id = abs(state->id) * -1; + nfa_print_state(debugf, state->out, ident + 4); + nfa_print_state(debugf, state->out1, ident + 4); +} + +/* + * Print the NFA state machine. + */ + static void +nfa_dump(prog) + nfa_regprog_T *prog; +{ + FILE *debugf = fopen("LOG.log", "a"); + + if (debugf != NULL) + { + nfa_print_state(debugf, prog->start, 0); + fclose(debugf); + } +} +#endif /* ENABLE_LOG */ +#endif /* DEBUG */ + +/* + * Parse r.e. @expr and convert it into postfix form. + * Return the postfix string on success, NULL otherwise. + */ + static int * +re2post() +{ + if (nfa_reg(REG_NOPAREN) == FAIL) + return NULL; + EMIT(NFA_MOPEN); + return post_start; +} + +/* NB. Some of the code below is inspired by Russ's. */ + +/* + * Represents an NFA state plus zero or one or two arrows exiting. + * if c == MATCH, no arrows out; matching state. + * If c == SPLIT, unlabeled arrows to out and out1 (if != NULL). + * If c < 256, labeled arrow with character c to out. + */ + +static nfa_state_T *state_ptr; /* points to nfa_prog->state */ + +/* + * Allocate and initialize nfa_state_T. + */ + static nfa_state_T * +new_state(c, out, out1) + int c; + nfa_state_T *out; + nfa_state_T *out1; +{ + nfa_state_T *s; + + if (istate >= nstate) + return NULL; + + s = &state_ptr[istate++]; + + s->c = c; + s->out = out; + s->out1 = out1; + + s->id = istate; + s->lastlist = 0; + s->lastthread = NULL; + s->visits = 0; + s->negated = FALSE; + + return s; +} + +/* + * A partially built NFA without the matching state filled in. + * Frag_T.start points at the start state. + * Frag_T.out is a list of places that need to be set to the + * next state for this fragment. + */ +typedef union Ptrlist Ptrlist; +struct Frag +{ + nfa_state_T *start; + Ptrlist *out; +}; +typedef struct Frag Frag_T; + +static Frag_T frag __ARGS((nfa_state_T *start, Ptrlist *out)); +static Ptrlist *list1 __ARGS((nfa_state_T **outp)); +static void patch __ARGS((Ptrlist *l, nfa_state_T *s)); +static Ptrlist *append __ARGS((Ptrlist *l1, Ptrlist *l2)); +static void st_push __ARGS((Frag_T s, Frag_T **p, Frag_T *stack_end)); +static Frag_T st_pop __ARGS((Frag_T **p, Frag_T *stack)); + +/* + * Initialize Frag_T struct. + */ + static Frag_T +frag(start, out) + nfa_state_T *start; + Ptrlist *out; +{ + Frag_T n = { start, out }; + return n; +} + +/* + * Since the out pointers in the list are always + * uninitialized, we use the pointers themselves + * as storage for the Ptrlists. + */ +union Ptrlist +{ + Ptrlist *next; + nfa_state_T *s; +}; + +/* + * Create singleton list containing just outp. + */ + static Ptrlist * +list1(outp) + nfa_state_T **outp; +{ + Ptrlist *l; + + l = (Ptrlist *)outp; + l->next = NULL; + return l; +} + +/* + * Patch the list of states at out to point to start. + */ + static void +patch(l, s) + Ptrlist *l; + nfa_state_T *s; +{ + Ptrlist *next; + + for (; l; l = next) + { + next = l->next; + l->s = s; + } +} + + +/* + * Join the two lists l1 and l2, returning the combination. + */ + static Ptrlist * +append(l1, l2) + Ptrlist *l1; + Ptrlist *l2; +{ + Ptrlist *oldl1; + + oldl1 = l1; + while (l1->next) + l1 = l1->next; + l1->next = l2; + return oldl1; +} + +/* + * Stack used for transforming postfix form into NFA. + */ +static Frag_T empty; + + static void +st_error(postfix, end, p) + int *postfix; + int *end; + int *p; +{ + FILE *df; + int *p2; + + df = fopen("stack.err", "a"); + if (df) + { + fprintf(df, "Error popping the stack!\n"); +#ifdef DEBUG + fprintf(df, "Current regexp is \"%s\"\n", nfa_regengine.expr); +#endif + fprintf(df, "Postfix form is: "); +#ifdef DEBUG + for (p2 = postfix; p2 < end; p2++) + { + nfa_set_code(*p2); + fprintf(df, "%s, ", code); + } + nfa_set_code(*p); + fprintf(df, "\nCurrent position is: "); + for (p2 = postfix; p2 <= p; p2 ++) + { + nfa_set_code(*p2); + fprintf(df, "%s, ", code); + } +#else + for (p2 = postfix; p2 < end; p2++) + { + fprintf(df, "%d, ", *p2); + } + fprintf(df, "\nCurrent position is: "); + for (p2 = postfix; p2 <= p; p2 ++) + { + fprintf(df, "%d, ", *p2); + } +#endif + fprintf(df, "\n--------------------------\n"); + fclose(df); + } + EMSG(_("E874: (NFA) Could not pop the stack !")); +} + +/* + * Push an item onto the stack. + */ + static void +st_push(s, p, stack_end) + Frag_T s; + Frag_T **p; + Frag_T *stack_end; +{ + Frag_T *stackp = *p; + + if (stackp >= stack_end) + return; + *stackp = s; + *p = *p + 1; +} + +/* + * Pop an item from the stack. + */ + static Frag_T +st_pop(p, stack) + Frag_T **p; + Frag_T *stack; +{ + Frag_T *stackp; + + *p = *p - 1; + stackp = *p; + if (stackp < stack) + return empty; + return **p; +} + +/* + * Convert a postfix form into its equivalent NFA. + * Return the NFA start state on success, NULL otherwise. + */ + static nfa_state_T * +post2nfa(postfix, end, nfa_calc_size) + int *postfix; + int *end; + int nfa_calc_size; +{ + int *p; + int mopen; + int mclose; + Frag_T *stack = NULL; + Frag_T *stackp = NULL; + Frag_T *stack_end = NULL; + Frag_T e1; + Frag_T e2; + Frag_T e; + nfa_state_T *s; + nfa_state_T *s1; + nfa_state_T *matchstate; + + if (postfix == NULL) + return NULL; + +#define PUSH(s) st_push ((s), &stackp, stack_end) +#define POP() st_pop(&stackp, stack); \ + if (stackp < stack) \ + { \ + st_error(postfix, end, p); \ + return NULL; \ + } + + if (nfa_calc_size == FALSE) + { + /* Allocate space for the stack. Max states on the stack : nstate */ + stack = (Frag_T *) lalloc((nstate + 1)*sizeof(Frag_T), TRUE); + stackp = stack; + stack_end = stack + NFA_STACK_SIZE; + } + + for (p = postfix; p < end; ++p) + { + switch (*p) + { + case NFA_CONCAT: + /* Catenation. + * Pay attention: this operator does not exist + * in the r.e. itself (it is implicit, really). + * It is added when r.e. is translated to postfix + * form in re2post(). + * + * No new state added here. */ + if (nfa_calc_size == TRUE) + { + nstate += 0; + break; + } + e2 = POP(); + e1 = POP(); + patch(e1.out, e2.start); + PUSH(frag(e1.start, e2.out)); + break; + + case NFA_NOT: + /* Negation of a character */ + if (nfa_calc_size == TRUE) + { + nstate += 0; + break; + } + e1 = POP(); + e1.start->negated = TRUE; + if (e1.start->c == NFA_MULTIBYTE || e1.start->c == NFA_COMPOSING) + e1.start->out1->negated = TRUE; + PUSH(e1); + break; + + case NFA_OR: + /* Alternation */ + if (nfa_calc_size == TRUE) + { + nstate ++; + break; + } + e2 = POP(); + e1 = POP(); + s = new_state(NFA_SPLIT, e1.start, e2.start); + if (s == NULL) + return NULL; + PUSH(frag(s, append(e1.out, e2.out))); + break; + + case NFA_STAR: + /* Zero or more */ + if (nfa_calc_size == TRUE) + { + nstate ++; + break; + } + e = POP(); + s = new_state(NFA_SPLIT, e.start, NULL); + if (s == NULL) + return NULL; + patch(e.out, s); + PUSH(frag(s, list1(&s->out1))); + break; + + case NFA_QUEST: + /* one or zero atoms=> greedy match */ + if (nfa_calc_size == TRUE) + { + nstate ++; + break; + } + e = POP(); + s = new_state(NFA_SPLIT, e.start, NULL); + if (s == NULL) + return NULL; + PUSH(frag(s, append(e.out, list1(&s->out1)))); + break; + + case NFA_QUEST_NONGREEDY: + /* zero or one atoms => non-greedy match */ + if (nfa_calc_size == TRUE) + { + nstate ++; + break; + } + e = POP(); + s = new_state(NFA_SPLIT, NULL, e.start); + if (s == NULL) + return NULL; + PUSH(frag(s, append(e.out, list1(&s->out)))); + break; + + case NFA_PLUS: + /* One or more */ + if (nfa_calc_size == TRUE) + { + nstate ++; + break; + } + e = POP(); + s = new_state(NFA_SPLIT, e.start, NULL); + if (s == NULL) + return NULL; + patch(e.out, s); + PUSH(frag(e.start, list1(&s->out1))); + break; + + case NFA_SKIP_CHAR: + /* Symbol of 0-length, Used in a repetition + * with max/min count of 0 */ + if (nfa_calc_size == TRUE) + { + nstate ++; + break; + } + s = new_state(NFA_SKIP_CHAR, NULL, NULL); + if (s == NULL) + return NULL; + PUSH(frag(s, list1(&s->out))); + break; + + case NFA_PREV_ATOM_NO_WIDTH: + /* The \@= operator: match the preceding atom with 0 width. + * Surrounds the preceding atom with START_INVISIBLE and + * END_INVISIBLE, similarly to MOPEN. + */ + /* TODO: Maybe this drops the speed? */ + return NULL; + + if (nfa_calc_size == TRUE) + { + nstate += 2; + break; + } + e = POP(); + s1 = new_state(NFA_END_INVISIBLE, NULL, NULL); + if (s1 == NULL) + return NULL; + patch(e.out, s1); + + s = new_state(NFA_START_INVISIBLE, e.start, s1); + if (s == NULL) + return NULL; + PUSH(frag(s, list1(&s1->out))); + break; + + case NFA_MOPEN + 0: /* Submatch */ + case NFA_MOPEN + 1: + case NFA_MOPEN + 2: + case NFA_MOPEN + 3: + case NFA_MOPEN + 4: + case NFA_MOPEN + 5: + case NFA_MOPEN + 6: + case NFA_MOPEN + 7: + case NFA_MOPEN + 8: + case NFA_MOPEN + 9: + case NFA_NOPEN: /* \%( "Invisible Submatch" */ + case NFA_MULTIBYTE: /* mbyte char */ + case NFA_COMPOSING: /* composing char */ + if (nfa_calc_size == TRUE) + { + nstate += 2; + break; + } + + mopen = *p; + switch (*p) + { + case NFA_NOPEN: + mclose = NFA_NCLOSE; + break; + case NFA_MULTIBYTE: + mclose = NFA_END_MULTIBYTE; + break; + case NFA_COMPOSING: + mclose = NFA_END_COMPOSING; + break; + default: + /* NFA_MOPEN(0) ... NFA_MOPEN(9) */ + mclose = *p + NSUBEXP; + break; + } + + /* Allow "NFA_MOPEN" as a valid postfix representation for + * the empty regexp "". In this case, the NFA will be + * NFA_MOPEN -> NFA_MCLOSE. Note that this also allows + * empty groups of parenthesis, and empty mbyte chars */ + if (stackp == stack) + { + s = new_state(mopen, NULL, NULL); + if (s == NULL) + return NULL; + s1 = new_state(mclose, NULL, NULL); + if (s1 == NULL) + return NULL; + patch(list1(&s->out), s1); + PUSH(frag(s, list1(&s1->out))); + break; + } + + /* At least one node was emitted before NFA_MOPEN, so + * at least one node will be between NFA_MOPEN and NFA_MCLOSE */ + e = POP(); + s = new_state(mopen, e.start, NULL); /* `(' */ + if (s == NULL) + return NULL; + + s1 = new_state(mclose, NULL, NULL); /* `)' */ + if (s1 == NULL) + return NULL; + patch(e.out, s1); + + if (mopen == NFA_MULTIBYTE || mopen == NFA_COMPOSING) + /* MULTIBYTE->out1 = END_MULTIBYTE + * COMPOSING->out1 = END_COMPOSING */ + patch(list1(&s->out1), s1); + + PUSH(frag(s, list1(&s1->out))); + break; + + case NFA_ZSTART: + case NFA_ZEND: + default: + /* Operands */ + if (nfa_calc_size == TRUE) + { + nstate ++; + break; + } + s = new_state(*p, NULL, NULL); + if (s == NULL) + return NULL; + PUSH(frag(s, list1(&s->out))); + break; + + } /* switch(*p) */ + + } /* for(p = postfix; *p; ++p) */ + + if (nfa_calc_size == TRUE) + { + nstate ++; + return NULL; /* Return value when counting size is ignored anyway */ + } + + e = POP(); + if (stackp != stack) + EMSG_RET_NULL(_("E875: (NFA regexp) (While converting from postfix to NFA), too many states left on stack")); + + if (istate >= nstate) + EMSG_RET_NULL(_("E876: (NFA regexp) Not enough space to store the whole NFA ")); + + vim_free(stack); + + matchstate = &state_ptr[istate++]; /* the match state */ + matchstate->c = NFA_MATCH; + matchstate->out = matchstate->out1 = NULL; + + patch(e.out, matchstate); + return e.start; + +#undef POP1 +#undef PUSH1 +#undef POP2 +#undef PUSH2 +#undef POP +#undef PUSH +} + +/**************************************************************** + * NFA execution code. + ****************************************************************/ + +/* thread_T contains runtime information of a NFA state */ +struct thread +{ + nfa_state_T *state; + regsub_T sub; /* submatch info */ +}; + +typedef struct +{ + thread_T *t; + int n; +} List; + +static void addstate __ARGS((List *l, nfa_state_T *state, regsub_T *m, int off, int lid, int *match)); + + static void +addstate(l, state, m, off, lid, match) + List *l; /* runtime state list */ + nfa_state_T *state; /* state to update */ + regsub_T *m; /* pointers to subexpressions */ + int off; + int lid; + int *match; /* found match? */ +{ + regsub_T save; + int subidx = 0; + + if (l == NULL || state == NULL) + return; + + switch (state->c) + { + case NFA_SPLIT: + case NFA_NOT: + case NFA_NOPEN: + case NFA_NCLOSE: + case NFA_MCLOSE: + case NFA_MCLOSE + 1: + case NFA_MCLOSE + 2: + case NFA_MCLOSE + 3: + case NFA_MCLOSE + 4: + case NFA_MCLOSE + 5: + case NFA_MCLOSE + 6: + case NFA_MCLOSE + 7: + case NFA_MCLOSE + 8: + case NFA_MCLOSE + 9: + /* Do not remember these nodes in list "thislist" or "nextlist" */ + break; + + default: + if (state->lastlist == lid) + { + if (++state->visits > 2) + return; + } + else + { + /* add the state to the list */ + state->lastlist = lid; + state->lastthread = &l->t[l->n++]; + state->lastthread->state = state; + state->lastthread->sub = *m; + } + } + +#ifdef ENABLE_LOG + nfa_set_code(state->c); + fprintf(log_fd, "> Adding state %d to list. Character %s, code %d\n", + abs(state->id), code, state->c); +#endif + switch (state->c) + { + case NFA_MATCH: + *match = TRUE; + break; + + case NFA_SPLIT: + addstate(l, state->out, m, off, lid, match); + addstate(l, state->out1, m, off, lid, match); + break; + + case NFA_SKIP_CHAR: + addstate(l, state->out, m, off, lid, match); + break; + +#if 0 + case NFA_END_NEG_RANGE: + /* Nothing to handle here. nfa_regmatch() will take care of it */ + break; + + case NFA_NOT: + EMSG(_("E999: (NFA regexp internal error) Should not process NOT node !")); +#ifdef ENABLE_LOG + fprintf(f, "\n\n>>> E999: Added state NFA_NOT to a list ... Something went wrong ! Why wasn't it processed already? \n\n"); +#endif + break; + + case NFA_COMPOSING: + /* nfa_regmatch() will match all the bytes of this composing char. */ + break; + + case NFA_MULTIBYTE: + /* nfa_regmatch() will match all the bytes of this multibyte char. */ + break; +#endif + + case NFA_END_MULTIBYTE: + /* Successfully matched this mbyte char */ + addstate(l, state->out, m, off, lid, match); + break; + + case NFA_NOPEN: + case NFA_NCLOSE: + addstate(l, state->out, m, off, lid, match); + break; + + /* If this state is reached, then a recursive call of nfa_regmatch() + * succeeded. the next call saves the found submatches in the + * first state after the "invisible" branch. */ +#if 0 + case NFA_END_INVISIBLE: + break; +#endif + + case NFA_MOPEN + 0: + case NFA_MOPEN + 1: + case NFA_MOPEN + 2: + case NFA_MOPEN + 3: + case NFA_MOPEN + 4: + case NFA_MOPEN + 5: + case NFA_MOPEN + 6: + case NFA_MOPEN + 7: + case NFA_MOPEN + 8: + case NFA_MOPEN + 9: + case NFA_ZSTART: + subidx = state->c - NFA_MOPEN; + if (state->c == NFA_ZSTART) + subidx = 0; + + if (REG_MULTI) + { + save.startpos[subidx] = m->startpos[subidx]; + save.endpos[subidx] = m->endpos[subidx]; + m->startpos[subidx].lnum = reglnum; + m->startpos[subidx].col = reginput - regline + off; + } + else + { + save.start[subidx] = m->start[subidx]; + save.end[subidx] = m->end[subidx]; + m->start[subidx] = reginput + off; + } + + addstate(l, state->out, m, off, lid, match); + + if (REG_MULTI) + { + m->startpos[subidx] = save.startpos[subidx]; + m->endpos[subidx] = save.endpos[subidx]; + } + else + { + m->start[subidx] = save.start[subidx]; + m->end[subidx] = save.end[subidx]; + } + break; + + case NFA_MCLOSE + 0: + if (nfa_has_zend == TRUE) + { + addstate(l, state->out, m, off, lid, match); + break; + } + case NFA_MCLOSE + 1: + case NFA_MCLOSE + 2: + case NFA_MCLOSE + 3: + case NFA_MCLOSE + 4: + case NFA_MCLOSE + 5: + case NFA_MCLOSE + 6: + case NFA_MCLOSE + 7: + case NFA_MCLOSE + 8: + case NFA_MCLOSE + 9: + case NFA_ZEND: + subidx = state->c - NFA_MCLOSE; + if (state->c == NFA_ZEND) + subidx = 0; + + if (REG_MULTI) + { + save.startpos[subidx] = m->startpos[subidx]; + save.endpos[subidx] = m->endpos[subidx]; + m->endpos[subidx].lnum = reglnum; + m->endpos[subidx].col = reginput - regline + off; + } + else + { + save.start[subidx] = m->start[subidx]; + save.end[subidx] = m->end[subidx]; + m->end[subidx] = reginput + off; + } + + addstate(l, state->out, m, off, lid, match); + + if (REG_MULTI) + { + m->startpos[subidx] = save.startpos[subidx]; + m->endpos[subidx] = save.endpos[subidx]; + } + else + { + m->start[subidx] = save.start[subidx]; + m->end[subidx] = save.end[subidx]; + } + break; + } +} + +/* + * Check character class "class" against current character c. + */ + static int +check_char_class(class, c) + int class; + int c; +{ + switch (class) + { + case NFA_CLASS_ALNUM: + if (isalnum(c)) + return OK; + break; + case NFA_CLASS_ALPHA: + if (isalpha(c)) + return OK; + break; + case NFA_CLASS_BLANK: + if (c == ' ' || c == '\t') + return OK; + break; + case NFA_CLASS_CNTRL: + if (iscntrl(c)) + return OK; + break; + case NFA_CLASS_DIGIT: + if (VIM_ISDIGIT(c)) + return OK; + break; + case NFA_CLASS_GRAPH: + if (isgraph(c)) + return OK; + break; + case NFA_CLASS_LOWER: + if (MB_ISLOWER(c)) + return OK; + break; + case NFA_CLASS_PRINT: + if (vim_isprintc(c)) + return OK; + break; + case NFA_CLASS_PUNCT: + if (ispunct(c)) + return OK; + break; + case NFA_CLASS_SPACE: + if ((c >=9 && c <= 13) || (c == ' ')) + return OK; + break; + case NFA_CLASS_UPPER: + if (MB_ISUPPER(c)) + return OK; + break; + case NFA_CLASS_XDIGIT: + if (vim_isxdigit(c)) + return OK; + break; + case NFA_CLASS_TAB: + if (c == '\t') + return OK; + break; + case NFA_CLASS_RETURN: + if (c == '\r') + return OK; + break; + case NFA_CLASS_BACKSPACE: + if (c == '\b') + return OK; + break; + case NFA_CLASS_ESCAPE: + if (c == '\033') + return OK; + break; + + default: + /* should not be here :P */ + EMSG_RET_FAIL(_("E877: (NFA regexp) Invalid character class ")); + } + return FAIL; +} + +/* + * Set all NFA nodes' list ID equal to -1. + */ + static void +nfa_set_neg_listids(start) + nfa_state_T *start; +{ + if (start == NULL) + return; + if (start->lastlist >= 0) + { + start->lastlist = -1; + nfa_set_neg_listids(start->out); + nfa_set_neg_listids(start->out1); + } +} + +/* + * Set all NFA nodes' list ID equal to 0. + */ + static void +nfa_set_null_listids(start) + nfa_state_T *start; +{ + if (start == NULL) + return; + if (start->lastlist == -1) + { + start->lastlist = 0; + nfa_set_null_listids(start->out); + nfa_set_null_listids(start->out1); + } +} + +/* + * Save list IDs for all NFA states in "list". + */ + static void +nfa_save_listids(start, list) + nfa_state_T *start; + int *list; +{ + if (start == NULL) + return; + if (start->lastlist != -1) + { + list[abs(start->id)] = start->lastlist; + start->lastlist = -1; + nfa_save_listids(start->out, list); + nfa_save_listids(start->out1, list); + } +} + +/* + * Restore list IDs from "list" to all NFA states. + */ + static void +nfa_restore_listids(start, list) + nfa_state_T *start; + int *list; +{ + if (start == NULL) + return; + if (start->lastlist == -1) + { + start->lastlist = list[abs(start->id)]; + nfa_restore_listids(start->out, list); + nfa_restore_listids(start->out1, list); + } +} + +/* + * Main matching routine. + * + * Run NFA to determine whether it matches reginput. + * + * Return TRUE if there is a match, FALSE otherwise. + * Note: Caller must ensure that: start != NULL. + */ + static int +nfa_regmatch(start, submatch, m) + nfa_state_T *start; + regsub_T *submatch; + regsub_T *m; +{ + int c = -1; + int n; + int i = 0; + int result; + int size = 0; + int match = FALSE; + int flag = 0; + int old_reglnum = -1; + int reginput_updated = FALSE; + thread_T *t; + char_u *cc; + char_u *old_reginput = NULL; + char_u *old_regline = NULL; + nfa_state_T *sta; + nfa_state_T *end; + List list[3]; + List *listtbl[2][2]; + List *ll; + int listid = 1; + int endnode = 0; + List *thislist; + List *nextlist; + List *neglist; + int *listids = NULL; + int j = 0; + int len = 0; +#ifdef DEBUG + FILE *debug = fopen("list.log", "a"); + + if (debug == NULL) + { + EMSG(_("(NFA) COULD NOT OPEN list.log !")); + return FALSE; + } +#endif + + /* Allocate memory for the lists of nodes */ + size = (nstate + 1) * sizeof(thread_T); + list[0].t = (thread_T *)lalloc(size, TRUE); + list[1].t = (thread_T *)lalloc(size, TRUE); + list[2].t = (thread_T *)lalloc(size, TRUE); + if (list[0].t == NULL || list[1].t == NULL || list[2].t == NULL) + goto theend; + vim_memset(list[0].t, 0, size); + vim_memset(list[1].t, 0, size); + vim_memset(list[2].t, 0, size); + +#ifdef ENABLE_LOG + log_fd = fopen(LOG_NAME, "a"); + if (log_fd != NULL) + { + fprintf(log_fd, "**********************************\n"); + nfa_set_code(start->c); + fprintf(log_fd, " RUNNING nfa_regmatch() starting with state %d, code %s\n", + abs(start->id), code); + fprintf(log_fd, "**********************************\n"); + } + else + { + EMSG(_("Could not open temporary log file for writing, displaying on stderr ... ")); + log_fd = stderr; + } +#endif + + thislist = &list[0]; + thislist->n = 0; + nextlist = &list[1]; + nextlist->n = 0; + neglist = &list[2]; + neglist->n = 0; +#ifdef ENABLE_LOG + fprintf(log_fd, "(---) STARTSTATE\n"); +#endif + addstate(thislist, start, m, 0, listid, &match); + + /* There are two cases when the NFA advances: 1. input char matches the + * NFA node and 2. input char does not match the NFA node, but the next + * node is NFA_NOT. The following macro calls addstate() according to + * these rules. It is used A LOT, so use the "listtbl" table for speed */ + listtbl[0][0] = NULL; + listtbl[0][1] = neglist; + listtbl[1][0] = nextlist; + listtbl[1][1] = NULL; +#define ADD_POS_NEG_STATE(node) \ + ll = listtbl[result ? 1 : 0][node->negated]; \ + if (ll != NULL) \ + addstate(ll, node->out , &t->sub, n, listid + 1, &match); + + + /* + * Run for each character. + */ + do { +again: +#ifdef FEAT_MBYTE + if (has_mbyte) + { + c = (*mb_ptr2char)(reginput); + n = (*mb_ptr2len)(reginput); + } + else +#endif + { + c = *reginput; + n = 1; + } + if (c == NUL) + n = 0; + cc = (char_u *)&c; + + /* swap lists */ + thislist = &list[flag]; + nextlist = &list[flag ^= 1]; + nextlist->n = 0; /* `clear' nextlist */ + listtbl[1][0] = nextlist; + ++listid; + +#ifdef ENABLE_LOG + fprintf(log_fd, "------------------------------------------\n"); + fprintf(log_fd, ">>> Reginput is \"%s\"\n", reginput); + fprintf(log_fd, ">>> Advanced one character ... Current char is %c (code %d) \n", c, (int)c); + fprintf(log_fd, ">>> Thislist has %d states available: ", thislist->n); + for (i = 0; i< thislist->n; i++) + fprintf(log_fd, "%d ", abs(thislist->t[i].state->id)); + fprintf(log_fd, "\n"); +#endif + +#ifdef DEBUG + fprintf(debug, "\n-------------------\n"); +#endif + + /* compute nextlist */ + for (i = 0; i < thislist->n || neglist->n > 0; ++i) + { + if (neglist->n > 0) + { + t = &neglist->t[0]; + neglist->n --; + i--; + } + else + t = &thislist->t[i]; + +#ifdef DEBUG + nfa_set_code(t->state->c); + fprintf(debug, "%s, ", code); +#endif +#ifdef ENABLE_LOG + nfa_set_code(t->state->c); + fprintf(log_fd, "(%d) %s, code %d ... \n", abs(t->state->id), + code, (int)t->state->c); +#endif + + /* + * Handle the possible codes of the current state. + * The most important is NFA_MATCH. + */ + switch (t->state->c) + { + case NFA_MATCH: + match = TRUE; + *submatch = t->sub; +#ifdef ENABLE_LOG + for (j = 0; j < 4; j++) + if (REG_MULTI) + fprintf(log_fd, "\n *** group %d, start: c=%d, l=%d, end: c=%d, l=%d", + j, + t->sub.startpos[j].col, + (int)t->sub.startpos[j].lnum, + t->sub.endpos[j].col, + (int)t->sub.endpos[j].lnum); + else + fprintf(log_fd, "\n *** group %d, start: \"%s\", end: \"%s\"", + j, + (char *)t->sub.start[j], + (char *)t->sub.end[j]); + fprintf(log_fd, "\n"); +#endif + goto nextchar; /* found the left-most longest match */ + + case NFA_END_INVISIBLE: + /* This is only encountered after a NFA_START_INVISIBLE node. + * They surround a zero-width group, used with "\@=" and "\&". + * If we got here, it means that the current "invisible" group + * finished successfully, so return control to the parent + * nfa_regmatch(). Submatches are stored in *m, and used in + * the parent call. */ + if (start->c == NFA_MOPEN + 0) + addstate(thislist, t->state->out, &t->sub, 0, listid, + &match); + else + { + *m = t->sub; + match = TRUE; + } + break; + + case NFA_START_INVISIBLE: + /* Save global variables, and call nfa_regmatch() to check if + * the current concat matches at this position. The concat + * ends with the node NFA_END_INVISIBLE */ + old_reginput = reginput; + old_regline = regline; + old_reglnum = reglnum; + if (listids == NULL) + { + listids = (int *) lalloc(sizeof(int) * nstate, TRUE); + if (listids == NULL) + { + EMSG(_("E878: (NFA) Could not allocate memory for branch traversal!")); + return 0; + } + } +#ifdef ENABLE_LOG + if (log_fd != stderr) + fclose(log_fd); + log_fd = NULL; +#endif + /* Have to clear the listid field of the NFA nodes, so that + * nfa_regmatch() and addstate() can run properly after + * recursion. */ + nfa_save_listids(start, listids); + nfa_set_null_listids(start); + result = nfa_regmatch(t->state->out, submatch, m); + nfa_set_neg_listids(start); + nfa_restore_listids(start, listids); + +#ifdef ENABLE_LOG + log_fd = fopen(LOG_NAME, "a"); + if (log_fd != NULL) + { + fprintf(log_fd, "****************************\n"); + fprintf(log_fd, "FINISHED RUNNING nfa_regmatch() recursively\n"); + fprintf(log_fd, "MATCH = %s\n", result == TRUE ? "OK" : "FALSE"); + fprintf(log_fd, "****************************\n"); + } + else + { + EMSG(_("Could not open temporary log file for writing, displaying on stderr ... ")); + log_fd = stderr; + } +#endif + if (result == TRUE) + { + /* Restore position in input text */ + reginput = old_reginput; + regline = old_regline; + reglnum = old_reglnum; + /* Copy submatch info from the recursive call */ + if (REG_MULTI) + for (j = 1; j < NSUBEXP; j++) + { + t->sub.startpos[j] = m->startpos[j]; + t->sub.endpos[j] = m->endpos[j]; + } + else + for (j = 1; j < NSUBEXP; j++) + { + t->sub.start[j] = m->start[j]; + t->sub.end[j] = m->end[j]; + } + /* t->state->out1 is the corresponding END_INVISIBLE node */ + addstate(thislist, t->state->out1->out, &t->sub, 0, listid, + &match); + } + else + { + /* continue with next input char */ + reginput = old_reginput; + } + break; + + case NFA_BOL: + if (reginput == regline) + addstate(thislist, t->state->out, &t->sub, 0, listid, + &match); + break; + + case NFA_EOL: + if (c == NUL) + addstate(thislist, t->state->out, &t->sub, 0, listid, + &match); + break; + + case NFA_BOW: + { + int bow = TRUE; + + if (c == NUL) + bow = FALSE; +#ifdef FEAT_MBYTE + else if (has_mbyte) + { + int this_class; + + /* Get class of current and previous char (if it exists). */ + this_class = mb_get_class(reginput); + if (this_class <= 1) + bow = FALSE; + else if (reg_prev_class() == this_class) + bow = FALSE; + } +#endif + else if (!vim_iswordc(c) + || (reginput > regline && vim_iswordc(reginput[-1]))) + bow = FALSE; + if (bow) + addstate(thislist, t->state->out, &t->sub, 0, listid, + &match); + break; + } + + case NFA_EOW: + { + int eow = TRUE; + + if (reginput == regline) + eow = FALSE; +#ifdef FEAT_MBYTE + else if (has_mbyte) + { + int this_class, prev_class; + + /* Get class of current and previous char (if it exists). */ + this_class = mb_get_class(reginput); + prev_class = reg_prev_class(); + if (this_class == prev_class + || prev_class == 0 || prev_class == 1) + eow = FALSE; + } +#endif + else if (!vim_iswordc(reginput[-1]) + || (reginput[0] != NUL && vim_iswordc(c))) + eow = FALSE; + if (eow) + addstate(thislist, t->state->out, &t->sub, 0, listid, + &match); + break; + } + + case NFA_MULTIBYTE: + case NFA_COMPOSING: + switch (t->state->c) + { + case NFA_MULTIBYTE: endnode = NFA_END_MULTIBYTE; break; + case NFA_COMPOSING: endnode = NFA_END_COMPOSING; break; + default: endnode = 0; + } + + result = OK; + sta = t->state->out; + len = 1; + while (sta->c != endnode && len <= n) + { + if (reginput[len-1] != sta->c) + { + result = OK - 1; + break; + } + len++; + sta = sta->out; + } + + /* if input char length doesn't match regexp char length */ + if (len -1 < n || sta->c != endnode) + result = OK - 1; + end = t->state->out1; /* NFA_END_MULTIBYTE or + NFA_END_COMPOSING */ + /* If \Z was present, then ignore composing characters */ + if (regflags & RF_ICOMBINE) + result = 1 ^ sta->negated; + ADD_POS_NEG_STATE(end); + break; + + case NFA_NEWL: + if (!reg_line_lbr && REG_MULTI + && c == NUL && reglnum <= reg_maxline) + { + if (reginput_updated == FALSE) + { + reg_nextline(); + reginput_updated = TRUE; + } + addstate(nextlist, t->state->out, &t->sub, n, listid + 1, + &match); + } + break; + + case NFA_CLASS_ALNUM: + case NFA_CLASS_ALPHA: + case NFA_CLASS_BLANK: + case NFA_CLASS_CNTRL: + case NFA_CLASS_DIGIT: + case NFA_CLASS_GRAPH: + case NFA_CLASS_LOWER: + case NFA_CLASS_PRINT: + case NFA_CLASS_PUNCT: + case NFA_CLASS_SPACE: + case NFA_CLASS_UPPER: + case NFA_CLASS_XDIGIT: + case NFA_CLASS_TAB: + case NFA_CLASS_RETURN: + case NFA_CLASS_BACKSPACE: + case NFA_CLASS_ESCAPE: + result = check_char_class(t->state->c, c); + ADD_POS_NEG_STATE(t->state); + break; + + case NFA_END_NEG_RANGE: + /* This follows a series of negated nodes, like: + * CHAR(x), NFA_NOT, CHAR(y), NFA_NOT etc. */ + if (c > 0) + addstate(nextlist, t->state->out, &t->sub, n, listid + 1, + &match); + break; + + case NFA_ANY: + /* Any printable char, not just any char. '\0' (end of input) + * must not match */ + if (c > 0) + addstate(nextlist, t->state->out, &t->sub, n, listid + 1, + &match); + break; + + /* + * Character classes like \a for alpha, \d for digit etc. + */ + case NFA_IDENT: /* \i */ + result = vim_isIDc(c); + ADD_POS_NEG_STATE(t->state); + break; + + case NFA_SIDENT: /* \I */ + result = !VIM_ISDIGIT(c) && vim_isIDc(c); + ADD_POS_NEG_STATE(t->state); + break; + + case NFA_KWORD: /* \k */ + result = vim_iswordp(cc); + ADD_POS_NEG_STATE(t->state); + break; + + case NFA_SKWORD: /* \K */ + result = !VIM_ISDIGIT(c) && vim_iswordp(cc); + ADD_POS_NEG_STATE(t->state); + break; + + case NFA_FNAME: /* \f */ + result = vim_isfilec(c); + ADD_POS_NEG_STATE(t->state); + break; + + case NFA_SFNAME: /* \F */ + result = !VIM_ISDIGIT(c) && vim_isfilec(c); + ADD_POS_NEG_STATE(t->state); + break; + + case NFA_PRINT: /* \p */ + result = ptr2cells(cc) == 1; + ADD_POS_NEG_STATE(t->state); + break; + + case NFA_SPRINT: /* \P */ + result = !VIM_ISDIGIT(c) && ptr2cells(cc) == 1; + ADD_POS_NEG_STATE(t->state); + break; + + case NFA_WHITE: /* \s */ + result = vim_iswhite(c); + ADD_POS_NEG_STATE(t->state); + break; + + case NFA_NWHITE: /* \S */ + result = c != NUL && !vim_iswhite(c); + ADD_POS_NEG_STATE(t->state); + break; + + case NFA_DIGIT: /* \d */ + result = ri_digit(c); + ADD_POS_NEG_STATE(t->state); + break; + + case NFA_NDIGIT: /* \D */ + result = c != NUL && !ri_digit(c); + ADD_POS_NEG_STATE(t->state); + break; + + case NFA_HEX: /* \x */ + result = ri_hex(c); + ADD_POS_NEG_STATE(t->state); + break; + + case NFA_NHEX: /* \X */ + result = c != NUL && !ri_hex(c); + ADD_POS_NEG_STATE(t->state); + break; + + case NFA_OCTAL: /* \o */ + result = ri_octal(c); + ADD_POS_NEG_STATE(t->state); + break; + + case NFA_NOCTAL: /* \O */ + result = c != NUL && !ri_octal(c); + ADD_POS_NEG_STATE(t->state); + break; + + case NFA_WORD: /* \w */ + result = ri_word(c); + ADD_POS_NEG_STATE(t->state); + break; + + case NFA_NWORD: /* \W */ + result = c != NUL && !ri_word(c); + ADD_POS_NEG_STATE(t->state); + break; + + case NFA_HEAD: /* \h */ + result = ri_head(c); + ADD_POS_NEG_STATE(t->state); + break; + + case NFA_NHEAD: /* \H */ + result = c != NUL && !ri_head(c); + ADD_POS_NEG_STATE(t->state); + break; + + case NFA_ALPHA: /* \a */ + result = ri_alpha(c); + ADD_POS_NEG_STATE(t->state); + break; + + case NFA_NALPHA: /* \A */ + result = c != NUL && !ri_alpha(c); + ADD_POS_NEG_STATE(t->state); + break; + + case NFA_LOWER: /* \l */ + result = ri_lower(c); + ADD_POS_NEG_STATE(t->state); + break; + + case NFA_NLOWER: /* \L */ + result = c != NUL && !ri_lower(c); + ADD_POS_NEG_STATE(t->state); + break; + + case NFA_UPPER: /* \u */ + result = ri_upper(c); + ADD_POS_NEG_STATE(t->state); + break; + + case NFA_NUPPER: /* \U */ + result = c != NUL && !ri_upper(c); + ADD_POS_NEG_STATE(t->state); + break; + + default: /* regular character */ + result = (no_Magic(t->state->c) == c); + if (!result) + result = ireg_ic == TRUE + && MB_TOLOWER(t->state->c) == MB_TOLOWER(c); + ADD_POS_NEG_STATE(t->state); + break; + } + + } /* for (thislist = thislist; thislist->state; thislist++) */ + + /* The first found match is the leftmost one, but there may be a + * longer one. Keep running the NFA, but don't start from the + * beginning. Also, do not add the start state in recursive calls of + * nfa_regmatch(), because recursive calls should only start in the + * first position. */ + if (match == FALSE && start->c == NFA_MOPEN + 0) + { +#ifdef ENABLE_LOG + fprintf(log_fd, "(---) STARTSTATE\n"); +#endif + addstate(nextlist, start, m, n, listid + 1, &match); + } + + if (reginput_updated) + { + reginput_updated = FALSE; + goto again; + } + +#ifdef ENABLE_LOG + fprintf(log_fd, ">>> Thislist had %d states available: ", thislist->n); + for (i = 0; i< thislist->n; i++) + fprintf(log_fd, "%d ", abs(thislist->t[i].state->id)); + fprintf(log_fd, "\n"); +#endif + +nextchar: + reginput += n; + } while (c || reginput_updated); + +#ifdef ENABLE_LOG + if (log_fd != stderr) + fclose(log_fd); + log_fd = NULL; +#endif + +theend: + /* Free memory */ + vim_free(list[0].t); + vim_free(list[1].t); + vim_free(list[2].t); + list[0].t = list[1].t = list[2].t = NULL; + if (listids != NULL) + vim_free(listids); +#undef ADD_POS_NEG_STATE +#ifdef DEBUG + fclose(debug); +#endif + + return match; +} + +/* + * Try match of "prog" with at regline["col"]. + * Returns 0 for failure, number of lines contained in the match otherwise. + */ + static long +nfa_regtry(start, col) + nfa_state_T *start; + colnr_T col; +{ + int i; + regsub_T sub, m; +#ifdef ENABLE_LOG + FILE *f; +#endif + + reginput = regline + col; + need_clear_subexpr = TRUE; + +#ifdef ENABLE_LOG + f = fopen(LOG_NAME, "a"); + if (f != NULL) + { + fprintf(f, "\n\n\n\n\n\n\t\t=======================================================\n"); + fprintf(f, " =======================================================\n"); +#ifdef DEBUG + fprintf(f, "\tRegexp is \"%s\"\n", nfa_regengine.expr); +#endif + fprintf(f, "\tInput text is \"%s\" \n", reginput); + fprintf(f, " =======================================================\n\n\n\n\n\n\n"); + nfa_print_state(f, start, 0); + fprintf(f, "\n\n"); + fclose(f); + } + else + EMSG(_("Could not open temporary log file for writing ")); +#endif + + if (REG_MULTI) + { + /* Use 0xff to set lnum to -1 */ + vim_memset(sub.startpos, 0xff, sizeof(lpos_T) * NSUBEXP); + vim_memset(sub.endpos, 0xff, sizeof(lpos_T) * NSUBEXP); + vim_memset(m.startpos, 0xff, sizeof(lpos_T) * NSUBEXP); + vim_memset(m.endpos, 0xff, sizeof(lpos_T) * NSUBEXP); + } + else + { + vim_memset(sub.start, 0, sizeof(char_u *) * NSUBEXP); + vim_memset(sub.end, 0, sizeof(char_u *) * NSUBEXP); + vim_memset(m.start, 0, sizeof(char_u *) * NSUBEXP); + vim_memset(m.end, 0, sizeof(char_u *) * NSUBEXP); + } + + if (nfa_regmatch(start, &sub, &m) == FALSE) + return 0; + + cleanup_subexpr(); + if (REG_MULTI) + { + for (i = 0; i < NSUBEXP; i++) + { + reg_startpos[i] = sub.startpos[i]; + reg_endpos[i] = sub.endpos[i]; + } + + if (reg_startpos[0].lnum < 0) + { + reg_startpos[0].lnum = 0; + reg_startpos[0].col = col; + } + if (reg_endpos[0].lnum < 0) + { + reg_endpos[0].lnum = reglnum; + reg_endpos[0].col = (int)(reginput - regline); + } + else + /* Use line number of "\ze". */ + reglnum = reg_endpos[0].lnum; + } + else + { + for (i = 0; i < NSUBEXP; i++) + { + reg_startp[i] = sub.start[i]; + reg_endp[i] = sub.end[i]; + } + + if (reg_startp[0] == NULL) + reg_startp[0] = regline + col; + if (reg_endp[0] == NULL) + reg_endp[0] = reginput; + } + + return 1 + reglnum; +} + +/* + * Match a regexp against a string ("line" points to the string) or multiple + * lines ("line" is NULL, use reg_getline()). + * + * Returns 0 for failure, number of lines contained in the match otherwise. + */ + static long +nfa_regexec_both(line, col) + char_u *line; + colnr_T col; /* column to start looking for match */ +{ + nfa_regprog_T *prog; + long retval = 0L; + int i; + + if (REG_MULTI) + { + prog = (nfa_regprog_T *)reg_mmatch->regprog; + line = reg_getline((linenr_T)0); /* relative to the cursor */ + reg_startpos = reg_mmatch->startpos; + reg_endpos = reg_mmatch->endpos; + } + else + { + prog = (nfa_regprog_T *)reg_match->regprog; + reg_startp = reg_match->startp; + reg_endp = reg_match->endp; + } + + /* Be paranoid... */ + if (prog == NULL || line == NULL) + { + EMSG(_(e_null)); + goto theend; + } + + /* If the start column is past the maximum column: no need to try. */ + if (ireg_maxcol > 0 && col >= ireg_maxcol) + goto theend; + + /* If pattern contains "\c" or "\C": overrule value of ireg_ic */ + if (prog->regflags & RF_ICASE) + ireg_ic = TRUE; + else if (prog->regflags & RF_NOICASE) + ireg_ic = FALSE; + +#ifdef FEAT_MBYTE + /* If pattern contains "\Z" overrule value of ireg_icombine */ + if (prog->regflags & RF_ICOMBINE) + ireg_icombine = TRUE; +#endif + + regline = line; + reglnum = 0; /* relative to line */ + + nstate = prog->nstate; + + for (i = 0; i < nstate; ++i) + { + prog->state[i].id = i; + prog->state[i].lastlist = 0; + prog->state[i].visits = 0; + prog->state[i].lastthread = NULL; + } + + retval = nfa_regtry(prog->start, col); + +theend: + return retval; +} + +/* + * Compile a regular expression into internal code for the NFA matcher. + * Returns the program in allocated space. Returns NULL for an error. + */ + static regprog_T * +nfa_regcomp(expr, re_flags) + char_u *expr; + int re_flags; +{ + nfa_regprog_T *prog; + int prog_size; + int *postfix; + + if (expr == NULL) + return NULL; + +#ifdef DEBUG + nfa_regengine.expr = expr; +#endif + + init_class_tab(); + + if (nfa_regcomp_start(expr, re_flags) == FAIL) + return NULL; + + /* Space for compiled regexp */ + prog_size = sizeof(nfa_regprog_T) + sizeof(nfa_state_T) * nstate_max; + prog = (nfa_regprog_T *)lalloc(prog_size, TRUE); + if (prog == NULL) + goto fail; + vim_memset(prog, 0, prog_size); + + /* Build postfix form of the regexp. Needed to build the NFA + * (and count its size) */ + postfix = re2post(); + if (postfix == NULL) + goto fail; /* Cascaded (syntax?) error */ + + /* + * In order to build the NFA, we parse the input regexp twice: + * 1. first pass to count size (so we can allocate space) + * 2. second to emit code + */ +#ifdef ENABLE_LOG + { + FILE *f = fopen(LOG_NAME, "a"); + + if (f != NULL) + { + fprintf(f, "\n*****************************\n\n\n\n\tCompiling regexp \"%s\" ... hold on !\n", expr); + fclose(f); + } + } +#endif + + /* + * PASS 1 + * Count number of NFA states in "nstate". Do not build the NFA. + */ + post2nfa(postfix, post_ptr, TRUE); + state_ptr = prog->state; + + /* + * PASS 2 + * Build the NFA + */ + prog->start = post2nfa(postfix, post_ptr, FALSE); + if (prog->start == NULL) + goto fail; + + prog->regflags = regflags; + prog->engine = &nfa_regengine; + prog->nstate = nstate; +#ifdef ENABLE_LOG + nfa_postfix_dump(expr, OK); + nfa_dump(prog); +#endif + +out: + vim_free(post_start); + post_start = post_ptr = post_end = NULL; + state_ptr = NULL; + return (regprog_T *)prog; + +fail: + vim_free(prog); + prog = NULL; +#ifdef ENABLE_LOG + nfa_postfix_dump(expr, FAIL); +#endif +#ifdef DEBUG + nfa_regengine.expr = NULL; +#endif + goto out; +} + + +/* + * Match a regexp against a string. + * "rmp->regprog" is a compiled regexp as returned by nfa_regcomp(). + * Uses curbuf for line count and 'iskeyword'. + * + * Return TRUE if there is a match, FALSE if not. + */ + static int +nfa_regexec(rmp, line, col) + regmatch_T *rmp; + char_u *line; /* string to match against */ + colnr_T col; /* column to start looking for match */ +{ + reg_match = rmp; + reg_mmatch = NULL; + reg_maxline = 0; + reg_line_lbr = FALSE; + reg_buf = curbuf; + reg_win = NULL; + ireg_ic = rmp->rm_ic; +#ifdef FEAT_MBYTE + ireg_icombine = FALSE; +#endif + ireg_maxcol = 0; + return (nfa_regexec_both(line, col) != 0); +} + +#if defined(FEAT_MODIFY_FNAME) || defined(FEAT_EVAL) \ + || defined(FIND_REPLACE_DIALOG) || defined(PROTO) + +static int nfa_regexec_nl __ARGS((regmatch_T *rmp, char_u *line, colnr_T col)); + +/* + * Like nfa_regexec(), but consider a "\n" in "line" to be a line break. + */ + static int +nfa_regexec_nl(rmp, line, col) + regmatch_T *rmp; + char_u *line; /* string to match against */ + colnr_T col; /* column to start looking for match */ +{ + reg_match = rmp; + reg_mmatch = NULL; + reg_maxline = 0; + reg_line_lbr = TRUE; + reg_buf = curbuf; + reg_win = NULL; + ireg_ic = rmp->rm_ic; +#ifdef FEAT_MBYTE + ireg_icombine = FALSE; +#endif + ireg_maxcol = 0; + return (nfa_regexec_both(line, col) != 0); +} +#endif + + +/* + * Match a regexp against multiple lines. + * "rmp->regprog" is a compiled regexp as returned by vim_regcomp(). + * Uses curbuf for line count and 'iskeyword'. + * + * Return zero if there is no match. Return number of lines contained in the + * match otherwise. + * + * Note: the body is the same as bt_regexec() except for nfa_regexec_both() + * + * ! Also NOTE : match may actually be in another line. e.g.: + * when r.e. is \nc, cursor is at 'a' and the text buffer looks like + * + * +-------------------------+ + * |a | + * |b | + * |c | + * | | + * +-------------------------+ + * + * then nfa_regexec_multi() returns 3. while the original + * vim_regexec_multi() returns 0 and a second call at line 2 will return 2. + * + * FIXME if this behavior is not compatible. + */ + static long +nfa_regexec_multi(rmp, win, buf, lnum, col, tm) + regmmatch_T *rmp; + win_T *win; /* window in which to search or NULL */ + buf_T *buf; /* buffer in which to search */ + linenr_T lnum; /* nr of line to start looking for match */ + colnr_T col; /* column to start looking for match */ + proftime_T *tm UNUSED; /* timeout limit or NULL */ +{ + long r; + buf_T *save_curbuf = curbuf; + + reg_match = NULL; + reg_mmatch = rmp; + reg_buf = buf; + reg_win = win; + reg_firstlnum = lnum; + reg_maxline = reg_buf->b_ml.ml_line_count - lnum; + reg_line_lbr = FALSE; + ireg_ic = rmp->rmm_ic; +#ifdef FEAT_MBYTE + ireg_icombine = FALSE; +#endif + ireg_maxcol = rmp->rmm_maxcol; + + /* Need to switch to buffer "buf" to make vim_iswordc() work. */ + curbuf = buf; + r = nfa_regexec_both(NULL, col); + curbuf = save_curbuf; + + return r; +} + +#ifdef DEBUG +# undef ENABLE_LOG +#endif |