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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 08:50:31 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 08:50:31 +0000
commitaed8ce9da277f5ecffe968b324f242c41c3b752a (patch)
treed2e538394cb7a8a7c42a4aac6ccf1a8e3256999b /src/regexp_nfa.c
parentInitial commit. (diff)
downloadvim-aed8ce9da277f5ecffe968b324f242c41c3b752a.tar.xz
vim-aed8ce9da277f5ecffe968b324f242c41c3b752a.zip
Adding upstream version 2:9.0.1378.upstream/2%9.0.1378upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/regexp_nfa.c')
-rw-r--r--src/regexp_nfa.c7648
1 files changed, 7648 insertions, 0 deletions
diff --git a/src/regexp_nfa.c b/src/regexp_nfa.c
new file mode 100644
index 0000000..cc29a4c
--- /dev/null
+++ b/src/regexp_nfa.c
@@ -0,0 +1,7648 @@
+/* vi:set ts=8 sts=4 sw=4 noet:
+ *
+ * NFA regular expression implementation.
+ *
+ * This file is included in "regexp.c".
+ */
+
+/*
+ * Logging of NFA engine.
+ *
+ * The NFA engine can write four log files:
+ * - Error log: Contains NFA engine's fatal errors.
+ * - Dump log: Contains compiled NFA state machine's information.
+ * - Run log: Contains information of matching procedure.
+ * - Debug log: Contains detailed information of matching procedure. Can be
+ * disabled by undefining NFA_REGEXP_DEBUG_LOG.
+ * The first one can also be used without debug mode.
+ * The last three are enabled when compiled as debug mode and individually
+ * disabled by commenting them out.
+ * The log files can get quite big!
+ * To disable all of this when compiling Vim for debugging, undefine DEBUG in
+ * regexp.c
+ */
+#ifdef DEBUG
+# define NFA_REGEXP_ERROR_LOG "nfa_regexp_error.log"
+# define ENABLE_LOG
+# define NFA_REGEXP_DUMP_LOG "nfa_regexp_dump.log"
+# define NFA_REGEXP_RUN_LOG "nfa_regexp_run.log"
+# define NFA_REGEXP_DEBUG_LOG "nfa_regexp_debug.log"
+#endif
+
+// Added to NFA_ANY - NFA_NUPPER_IC to include a NL.
+#define NFA_ADD_NL 31
+
+enum
+{
+ NFA_SPLIT = -1024,
+ NFA_MATCH,
+ NFA_EMPTY, // matches 0-length
+
+ NFA_START_COLL, // [abc] start
+ NFA_END_COLL, // [abc] end
+ NFA_START_NEG_COLL, // [^abc] start
+ NFA_END_NEG_COLL, // [^abc] end (postfix only)
+ NFA_RANGE, // range of the two previous items
+ // (postfix only)
+ NFA_RANGE_MIN, // low end of a range
+ NFA_RANGE_MAX, // high end of a range
+
+ NFA_CONCAT, // concatenate two previous items (postfix
+ // only)
+ NFA_OR, // \| (postfix only)
+ NFA_STAR, // greedy * (postfix only)
+ NFA_STAR_NONGREEDY, // non-greedy * (postfix only)
+ NFA_QUEST, // greedy \? (postfix only)
+ NFA_QUEST_NONGREEDY, // non-greedy \? (postfix only)
+
+ 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_START_INVISIBLE_FIRST,
+ NFA_START_INVISIBLE_NEG,
+ NFA_START_INVISIBLE_NEG_FIRST,
+ NFA_START_INVISIBLE_BEFORE,
+ NFA_START_INVISIBLE_BEFORE_FIRST,
+ NFA_START_INVISIBLE_BEFORE_NEG,
+ NFA_START_INVISIBLE_BEFORE_NEG_FIRST,
+ NFA_START_PATTERN,
+ NFA_END_INVISIBLE,
+ NFA_END_INVISIBLE_NEG,
+ NFA_END_PATTERN,
+ NFA_COMPOSING, // Next nodes in NFA are part of the
+ // composing multibyte char
+ NFA_END_COMPOSING, // End of a composing char in the NFA
+ NFA_ANY_COMPOSING, // \%C: Any composing characters.
+ NFA_OPT_CHARS, // \%[abc]
+
+ // 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_BACKREF1, // \1
+ NFA_BACKREF2, // \2
+ NFA_BACKREF3, // \3
+ NFA_BACKREF4, // \4
+ NFA_BACKREF5, // \5
+ NFA_BACKREF6, // \6
+ NFA_BACKREF7, // \7
+ NFA_BACKREF8, // \8
+ NFA_BACKREF9, // \9
+#ifdef FEAT_SYN_HL
+ NFA_ZREF1, // \z1
+ NFA_ZREF2, // \z2
+ NFA_ZREF3, // \z3
+ NFA_ZREF4, // \z4
+ NFA_ZREF5, // \z5
+ NFA_ZREF6, // \z6
+ NFA_ZREF7, // \z7
+ NFA_ZREF8, // \z8
+ NFA_ZREF9, // \z9
+#endif
+ NFA_SKIP, // Skip characters
+
+ NFA_MOPEN,
+ NFA_MOPEN1,
+ NFA_MOPEN2,
+ NFA_MOPEN3,
+ NFA_MOPEN4,
+ NFA_MOPEN5,
+ NFA_MOPEN6,
+ NFA_MOPEN7,
+ NFA_MOPEN8,
+ NFA_MOPEN9,
+
+ NFA_MCLOSE,
+ NFA_MCLOSE1,
+ NFA_MCLOSE2,
+ NFA_MCLOSE3,
+ NFA_MCLOSE4,
+ NFA_MCLOSE5,
+ NFA_MCLOSE6,
+ NFA_MCLOSE7,
+ NFA_MCLOSE8,
+ NFA_MCLOSE9,
+
+#ifdef FEAT_SYN_HL
+ NFA_ZOPEN,
+ NFA_ZOPEN1,
+ NFA_ZOPEN2,
+ NFA_ZOPEN3,
+ NFA_ZOPEN4,
+ NFA_ZOPEN5,
+ NFA_ZOPEN6,
+ NFA_ZOPEN7,
+ NFA_ZOPEN8,
+ NFA_ZOPEN9,
+
+ NFA_ZCLOSE,
+ NFA_ZCLOSE1,
+ NFA_ZCLOSE2,
+ NFA_ZCLOSE3,
+ NFA_ZCLOSE4,
+ NFA_ZCLOSE5,
+ NFA_ZCLOSE6,
+ NFA_ZCLOSE7,
+ NFA_ZCLOSE8,
+ NFA_ZCLOSE9,
+#endif
+
+ // NFA_FIRST_NL
+ NFA_ANY, // Match any one character.
+ 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_LOWER_IC, // Match [a-z]
+ NFA_NLOWER_IC, // Match [^a-z]
+ NFA_UPPER_IC, // Match [A-Z]
+ NFA_NUPPER_IC, // Match [^A-Z]
+
+ NFA_FIRST_NL = NFA_ANY + NFA_ADD_NL,
+ NFA_LAST_NL = NFA_NUPPER_IC + NFA_ADD_NL,
+
+ NFA_CURSOR, // Match cursor pos
+ NFA_LNUM, // Match line number
+ NFA_LNUM_GT, // Match > line number
+ NFA_LNUM_LT, // Match < line number
+ NFA_COL, // Match cursor column
+ NFA_COL_GT, // Match > cursor column
+ NFA_COL_LT, // Match < cursor column
+ NFA_VCOL, // Match cursor virtual column
+ NFA_VCOL_GT, // Match > cursor virtual column
+ NFA_VCOL_LT, // Match < cursor virtual column
+ NFA_MARK, // Match mark
+ NFA_MARK_GT, // Match > mark
+ NFA_MARK_LT, // Match < mark
+ NFA_VISUAL, // Match Visual area
+
+ // 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,
+ NFA_CLASS_IDENT,
+ NFA_CLASS_KEYWORD,
+ NFA_CLASS_FNAME
+};
+
+// 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
+};
+
+// Variables only used in nfa_regcomp() and descendants.
+static int nfa_re_flags; // re_flags passed to nfa_regcomp()
+static int *post_start; // holds the postfix form of r.e.
+static int *post_end;
+static int *post_ptr;
+
+// Set when the pattern should use the NFA engine.
+// E.g. [[:upper:]] only allows 8bit characters for BT engine,
+// while NFA engine handles multibyte characters correctly.
+static int wants_nfa;
+
+static int nstate; // Number of states in the NFA.
+static int istate; // Index in the state vector, used in alloc_state()
+
+// If not NULL match must end at this position
+static save_se_T *nfa_endp = NULL;
+
+// 0 for first call to nfa_regmatch(), 1 for recursive call.
+static int nfa_ll_index = 0;
+
+static int realloc_post_list(void);
+static int nfa_reg(int paren);
+#ifdef DEBUG
+static void nfa_print_state2(FILE *debugf, nfa_state_T *state, garray_T *indent);
+#endif
+static int match_follows(nfa_state_T *startstate, int depth);
+static int failure_chance(nfa_state_T *state, int depth);
+
+// helper functions used when doing re2post() ... regatom() parsing
+#define EMIT(c) do { \
+ if (post_ptr >= post_end && realloc_post_list() == FAIL) \
+ return FAIL; \
+ *post_ptr++ = c; \
+ } while (0)
+
+/*
+ * Initialize internal variables before NFA compilation.
+ * Return OK on success, FAIL otherwise.
+ */
+ static int
+nfa_regcomp_start(
+ char_u *expr,
+ int re_flags) // see vim_regcomp()
+{
+ size_t postfix_size;
+ int nstate_max;
+
+ nstate = 0;
+ istate = 0;
+ // A reasonable estimation for maximum size
+ nstate_max = (int)(STRLEN(expr) + 1) * 25;
+
+ // Some items blow up in size, such as [A-z]. Add more space for that.
+ // When it is still not enough realloc_post_list() will be used.
+ nstate_max += 1000;
+
+ // Size for postfix representation of expr.
+ postfix_size = sizeof(int) * nstate_max;
+
+ post_start = alloc(postfix_size);
+ if (post_start == NULL)
+ return FAIL;
+ post_ptr = post_start;
+ post_end = post_start + nstate_max;
+ wants_nfa = FALSE;
+ rex.nfa_has_zend = FALSE;
+ rex.nfa_has_backref = FALSE;
+
+ // shared with BT engine
+ regcomp_start(expr, re_flags);
+
+ return OK;
+}
+
+/*
+ * Figure out if the NFA state list starts with an anchor, must match at start
+ * of the line.
+ */
+ static int
+nfa_get_reganch(nfa_state_T *start, int depth)
+{
+ nfa_state_T *p = start;
+
+ if (depth > 4)
+ return 0;
+
+ while (p != NULL)
+ {
+ switch (p->c)
+ {
+ case NFA_BOL:
+ case NFA_BOF:
+ return 1; // yes!
+
+ case NFA_ZSTART:
+ case NFA_ZEND:
+ case NFA_CURSOR:
+ case NFA_VISUAL:
+
+ case NFA_MOPEN:
+ case NFA_MOPEN1:
+ case NFA_MOPEN2:
+ case NFA_MOPEN3:
+ case NFA_MOPEN4:
+ case NFA_MOPEN5:
+ case NFA_MOPEN6:
+ case NFA_MOPEN7:
+ case NFA_MOPEN8:
+ case NFA_MOPEN9:
+ case NFA_NOPEN:
+#ifdef FEAT_SYN_HL
+ case NFA_ZOPEN:
+ case NFA_ZOPEN1:
+ case NFA_ZOPEN2:
+ case NFA_ZOPEN3:
+ case NFA_ZOPEN4:
+ case NFA_ZOPEN5:
+ case NFA_ZOPEN6:
+ case NFA_ZOPEN7:
+ case NFA_ZOPEN8:
+ case NFA_ZOPEN9:
+#endif
+ p = p->out;
+ break;
+
+ case NFA_SPLIT:
+ return nfa_get_reganch(p->out, depth + 1)
+ && nfa_get_reganch(p->out1, depth + 1);
+
+ default:
+ return 0; // noooo
+ }
+ }
+ return 0;
+}
+
+/*
+ * Figure out if the NFA state list starts with a character which must match
+ * at start of the match.
+ */
+ static int
+nfa_get_regstart(nfa_state_T *start, int depth)
+{
+ nfa_state_T *p = start;
+
+ if (depth > 4)
+ return 0;
+
+ while (p != NULL)
+ {
+ switch (p->c)
+ {
+ // all kinds of zero-width matches
+ case NFA_BOL:
+ case NFA_BOF:
+ case NFA_BOW:
+ case NFA_EOW:
+ case NFA_ZSTART:
+ case NFA_ZEND:
+ case NFA_CURSOR:
+ case NFA_VISUAL:
+ case NFA_LNUM:
+ case NFA_LNUM_GT:
+ case NFA_LNUM_LT:
+ case NFA_COL:
+ case NFA_COL_GT:
+ case NFA_COL_LT:
+ case NFA_VCOL:
+ case NFA_VCOL_GT:
+ case NFA_VCOL_LT:
+ case NFA_MARK:
+ case NFA_MARK_GT:
+ case NFA_MARK_LT:
+
+ case NFA_MOPEN:
+ case NFA_MOPEN1:
+ case NFA_MOPEN2:
+ case NFA_MOPEN3:
+ case NFA_MOPEN4:
+ case NFA_MOPEN5:
+ case NFA_MOPEN6:
+ case NFA_MOPEN7:
+ case NFA_MOPEN8:
+ case NFA_MOPEN9:
+ case NFA_NOPEN:
+#ifdef FEAT_SYN_HL
+ case NFA_ZOPEN:
+ case NFA_ZOPEN1:
+ case NFA_ZOPEN2:
+ case NFA_ZOPEN3:
+ case NFA_ZOPEN4:
+ case NFA_ZOPEN5:
+ case NFA_ZOPEN6:
+ case NFA_ZOPEN7:
+ case NFA_ZOPEN8:
+ case NFA_ZOPEN9:
+#endif
+ p = p->out;
+ break;
+
+ case NFA_SPLIT:
+ {
+ int c1 = nfa_get_regstart(p->out, depth + 1);
+ int c2 = nfa_get_regstart(p->out1, depth + 1);
+
+ if (c1 == c2)
+ return c1; // yes!
+ return 0;
+ }
+
+ default:
+ if (p->c > 0)
+ return p->c; // yes!
+ return 0;
+ }
+ }
+ return 0;
+}
+
+/*
+ * Figure out if the NFA state list contains just literal text and nothing
+ * else. If so return a string in allocated memory with what must match after
+ * regstart. Otherwise return NULL.
+ */
+ static char_u *
+nfa_get_match_text(nfa_state_T *start)
+{
+ nfa_state_T *p = start;
+ int len = 0;
+ char_u *ret;
+ char_u *s;
+
+ if (p->c != NFA_MOPEN)
+ return NULL; // just in case
+ p = p->out;
+ while (p->c > 0)
+ {
+ len += MB_CHAR2LEN(p->c);
+ p = p->out;
+ }
+ if (p->c != NFA_MCLOSE || p->out->c != NFA_MATCH)
+ return NULL;
+
+ ret = alloc(len);
+ if (ret == NULL)
+ return NULL;
+
+ p = start->out->out; // skip first char, it goes into regstart
+ s = ret;
+ while (p->c > 0)
+ {
+ if (has_mbyte)
+ s += (*mb_char2bytes)(p->c, s);
+ else
+ *s++ = p->c;
+ p = p->out;
+ }
+ *s = NUL;
+ return ret;
+}
+
+/*
+ * Allocate more space for post_start. Called when
+ * running above the estimated number of states.
+ */
+ static int
+realloc_post_list(void)
+{
+ int nstate_max = (int)(post_end - post_start);
+ int new_max;
+ int *new_start;
+ int *old_start;
+
+ // For weird patterns the number of states can be very high. Increasing by
+ // 50% seems a reasonable compromise between memory use and speed.
+ new_max = nstate_max * 3 / 2;
+ new_start = ALLOC_MULT(int, new_max);
+ if (new_start == NULL)
+ return FAIL;
+ mch_memmove(new_start, post_start, nstate_max * sizeof(int));
+ old_start = post_start;
+ post_start = new_start;
+ post_ptr = new_start + (post_ptr - old_start);
+ post_end = post_start + new_max;
+ vim_free(old_start);
+ 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.
+ * Keep in mind that 'ignorecase' applies at execution time, thus [a-z] may
+ * need to be interpreted as [a-zA-Z].
+ */
+ static int
+nfa_recognize_char_class(char_u *start, char_u *end, int extra_newl)
+{
+# define CLASS_not 0x80
+# define CLASS_af 0x40
+# define CLASS_AF 0x20
+# define CLASS_az 0x10
+# define CLASS_AZ 0x08
+# define CLASS_o7 0x04
+# define CLASS_o9 0x02
+# define CLASS_underscore 0x01
+
+ int newl = FALSE;
+ char_u *p;
+ int config = 0;
+
+ if (extra_newl == TRUE)
+ newl = TRUE;
+
+ if (*end != ']')
+ return FAIL;
+ p = start;
+ if (*p == '^')
+ {
+ config |= CLASS_not;
+ p++;
+ }
+
+ while (p < end)
+ {
+ if (p + 2 < end && *(p + 1) == '-')
+ {
+ switch (*p)
+ {
+ case '0':
+ if (*(p + 2) == '9')
+ {
+ config |= CLASS_o9;
+ break;
+ }
+ if (*(p + 2) == '7')
+ {
+ config |= CLASS_o7;
+ break;
+ }
+ return FAIL;
+
+ case 'a':
+ if (*(p + 2) == 'z')
+ {
+ config |= CLASS_az;
+ break;
+ }
+ if (*(p + 2) == 'f')
+ {
+ config |= CLASS_af;
+ break;
+ }
+ return FAIL;
+
+ case 'A':
+ if (*(p + 2) == 'Z')
+ {
+ config |= CLASS_AZ;
+ break;
+ }
+ if (*(p + 2) == 'F')
+ {
+ config |= CLASS_AF;
+ break;
+ }
+ return FAIL;
+
+ default:
+ return FAIL;
+ }
+ p += 3;
+ }
+ else if (p + 1 < end && *p == '\\' && *(p + 1) == 'n')
+ {
+ newl = TRUE;
+ p += 2;
+ }
+ else if (*p == '_')
+ {
+ config |= CLASS_underscore;
+ p ++;
+ }
+ else if (*p == '\n')
+ {
+ newl = TRUE;
+ p ++;
+ }
+ else
+ return FAIL;
+ } // while (p < end)
+
+ if (p != end)
+ return FAIL;
+
+ if (newl == TRUE)
+ extra_newl = NFA_ADD_NL;
+
+ switch (config)
+ {
+ case CLASS_o9:
+ return extra_newl + NFA_DIGIT;
+ case CLASS_not | CLASS_o9:
+ return extra_newl + NFA_NDIGIT;
+ case CLASS_af | CLASS_AF | CLASS_o9:
+ return extra_newl + NFA_HEX;
+ case CLASS_not | CLASS_af | CLASS_AF | CLASS_o9:
+ return extra_newl + NFA_NHEX;
+ case CLASS_o7:
+ return extra_newl + NFA_OCTAL;
+ case CLASS_not | CLASS_o7:
+ return extra_newl + NFA_NOCTAL;
+ case CLASS_az | CLASS_AZ | CLASS_o9 | CLASS_underscore:
+ return extra_newl + NFA_WORD;
+ case CLASS_not | CLASS_az | CLASS_AZ | CLASS_o9 | CLASS_underscore:
+ return extra_newl + NFA_NWORD;
+ case CLASS_az | CLASS_AZ | CLASS_underscore:
+ return extra_newl + NFA_HEAD;
+ case CLASS_not | CLASS_az | CLASS_AZ | CLASS_underscore:
+ return extra_newl + NFA_NHEAD;
+ case CLASS_az | CLASS_AZ:
+ return extra_newl + NFA_ALPHA;
+ case CLASS_not | CLASS_az | CLASS_AZ:
+ return extra_newl + NFA_NALPHA;
+ case CLASS_az:
+ return extra_newl + NFA_LOWER_IC;
+ case CLASS_not | CLASS_az:
+ return extra_newl + NFA_NLOWER_IC;
+ case CLASS_AZ:
+ return extra_newl + NFA_UPPER_IC;
+ case CLASS_not | CLASS_AZ:
+ return extra_newl + NFA_NUPPER_IC;
+ }
+ return FAIL;
+}
+
+/*
+ * 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(int c)
+{
+#define EMIT2(c) EMIT(c); EMIT(NFA_CONCAT);
+
+ if (enc_utf8 || STRCMP(p_enc, "latin1") == 0
+ || STRCMP(p_enc, "iso-8859-15") == 0)
+ {
+#define A_grave 0xc0
+#define A_acute 0xc1
+#define A_circumflex 0xc2
+#define A_virguilla 0xc3
+#define A_diaeresis 0xc4
+#define A_ring 0xc5
+#define C_cedilla 0xc7
+#define E_grave 0xc8
+#define E_acute 0xc9
+#define E_circumflex 0xca
+#define E_diaeresis 0xcb
+#define I_grave 0xcc
+#define I_acute 0xcd
+#define I_circumflex 0xce
+#define I_diaeresis 0xcf
+#define N_virguilla 0xd1
+#define O_grave 0xd2
+#define O_acute 0xd3
+#define O_circumflex 0xd4
+#define O_virguilla 0xd5
+#define O_diaeresis 0xd6
+#define O_slash 0xd8
+#define U_grave 0xd9
+#define U_acute 0xda
+#define U_circumflex 0xdb
+#define U_diaeresis 0xdc
+#define Y_acute 0xdd
+#define a_grave 0xe0
+#define a_acute 0xe1
+#define a_circumflex 0xe2
+#define a_virguilla 0xe3
+#define a_diaeresis 0xe4
+#define a_ring 0xe5
+#define c_cedilla 0xe7
+#define e_grave 0xe8
+#define e_acute 0xe9
+#define e_circumflex 0xea
+#define e_diaeresis 0xeb
+#define i_grave 0xec
+#define i_acute 0xed
+#define i_circumflex 0xee
+#define i_diaeresis 0xef
+#define n_virguilla 0xf1
+#define o_grave 0xf2
+#define o_acute 0xf3
+#define o_circumflex 0xf4
+#define o_virguilla 0xf5
+#define o_diaeresis 0xf6
+#define o_slash 0xf8
+#define u_grave 0xf9
+#define u_acute 0xfa
+#define u_circumflex 0xfb
+#define u_diaeresis 0xfc
+#define y_acute 0xfd
+#define y_diaeresis 0xff
+ switch (c)
+ {
+ case 'A': case A_grave: case A_acute: case A_circumflex:
+ case A_virguilla: case A_diaeresis: case A_ring:
+ case 0x100: case 0x102: case 0x104: case 0x1cd:
+ case 0x1de: case 0x1e0: case 0x1fa: case 0x200:
+ case 0x202: case 0x226: case 0x23a: case 0x1e00:
+ case 0x1ea0: case 0x1ea2: case 0x1ea4: case 0x1ea6:
+ case 0x1ea8: case 0x1eaa: case 0x1eac: case 0x1eae:
+ case 0x1eb0: case 0x1eb2: case 0x1eb4: case 0x1eb6:
+ EMIT2('A') EMIT2(A_grave) EMIT2(A_acute)
+ EMIT2(A_circumflex) EMIT2(A_virguilla)
+ EMIT2(A_diaeresis) EMIT2(A_ring)
+ EMIT2(0x100) EMIT2(0x102) EMIT2(0x104)
+ EMIT2(0x1cd) EMIT2(0x1de) EMIT2(0x1e0)
+ EMIT2(0x1fa) EMIT2(0x200) EMIT2(0x202)
+ EMIT2(0x226) EMIT2(0x23a) EMIT2(0x1e00)
+ EMIT2(0x1ea0) EMIT2(0x1ea2) EMIT2(0x1ea4)
+ EMIT2(0x1ea6) EMIT2(0x1ea8) EMIT2(0x1eaa)
+ EMIT2(0x1eac) EMIT2(0x1eae) EMIT2(0x1eb0)
+ EMIT2(0x1eb2) EMIT2(0x1eb6) EMIT2(0x1eb4)
+ return OK;
+
+ case 'B': case 0x181: case 0x243: case 0x1e02:
+ case 0x1e04: case 0x1e06:
+ EMIT2('B')
+ EMIT2(0x181) EMIT2(0x243) EMIT2(0x1e02)
+ EMIT2(0x1e04) EMIT2(0x1e06)
+ return OK;
+
+ case 'C': case C_cedilla: case 0x106: case 0x108:
+ case 0x10a: case 0x10c: case 0x187: case 0x23b:
+ case 0x1e08: case 0xa792:
+ EMIT2('C') EMIT2(C_cedilla)
+ EMIT2(0x106) EMIT2(0x108) EMIT2(0x10a)
+ EMIT2(0x10c) EMIT2(0x187) EMIT2(0x23b)
+ EMIT2(0x1e08) EMIT2(0xa792)
+ return OK;
+
+ case 'D': case 0x10e: case 0x110: case 0x18a:
+ case 0x1e0a: case 0x1e0c: case 0x1e0e: case 0x1e10:
+ case 0x1e12:
+ EMIT2('D') EMIT2(0x10e) EMIT2(0x110) EMIT2(0x18a)
+ EMIT2(0x1e0a) EMIT2(0x1e0c) EMIT2(0x1e0e)
+ EMIT2(0x1e10) EMIT2(0x1e12)
+ return OK;
+
+ case 'E': case E_grave: case E_acute: case E_circumflex:
+ case E_diaeresis: case 0x112: case 0x114: case 0x116:
+ case 0x118: case 0x11a: case 0x204: case 0x206:
+ case 0x228: case 0x246: case 0x1e14: case 0x1e16:
+ case 0x1e18: case 0x1e1a: case 0x1e1c: case 0x1eb8:
+ case 0x1eba: case 0x1ebc: case 0x1ebe: case 0x1ec0:
+ case 0x1ec2: case 0x1ec4: case 0x1ec6:
+ EMIT2('E') EMIT2(E_grave) EMIT2(E_acute)
+ EMIT2(E_circumflex) EMIT2(E_diaeresis)
+ EMIT2(0x112) EMIT2(0x114) EMIT2(0x116)
+ EMIT2(0x118) EMIT2(0x11a) EMIT2(0x204)
+ EMIT2(0x206) EMIT2(0x228) EMIT2(0x246)
+ EMIT2(0x1e14) EMIT2(0x1e16) EMIT2(0x1e18)
+ EMIT2(0x1e1a) EMIT2(0x1e1c) EMIT2(0x1eb8)
+ EMIT2(0x1eba) EMIT2(0x1ebc) EMIT2(0x1ebe)
+ EMIT2(0x1ec0) EMIT2(0x1ec2) EMIT2(0x1ec4)
+ EMIT2(0x1ec6)
+ return OK;
+
+ case 'F': case 0x191: case 0x1e1e: case 0xa798:
+ EMIT2('F') EMIT2(0x191) EMIT2(0x1e1e) EMIT2(0xa798)
+ return OK;
+
+ case 'G': case 0x11c: case 0x11e: case 0x120:
+ case 0x122: case 0x193: case 0x1e4: case 0x1e6:
+ case 0x1f4: case 0x1e20: case 0xa7a0:
+ EMIT2('G') EMIT2(0x11c) EMIT2(0x11e) EMIT2(0x120)
+ EMIT2(0x122) EMIT2(0x193) EMIT2(0x1e4)
+ EMIT2(0x1e6) EMIT2(0x1f4) EMIT2(0x1e20)
+ EMIT2(0xa7a0)
+ return OK;
+
+ case 'H': case 0x124: case 0x126: case 0x21e:
+ case 0x1e22: case 0x1e24: case 0x1e26: case 0x1e28:
+ case 0x1e2a: case 0x2c67:
+ EMIT2('H') EMIT2(0x124) EMIT2(0x126) EMIT2(0x21e)
+ EMIT2(0x1e22) EMIT2(0x1e24) EMIT2(0x1e26)
+ EMIT2(0x1e28) EMIT2(0x1e2a) EMIT2(0x2c67)
+ return OK;
+
+ case 'I': case I_grave: case I_acute: case I_circumflex:
+ case I_diaeresis: case 0x128: case 0x12a: case 0x12c:
+ case 0x12e: case 0x130: case 0x197: case 0x1cf:
+ case 0x208: case 0x20a: case 0x1e2c: case 0x1e2e:
+ case 0x1ec8: case 0x1eca:
+ EMIT2('I') EMIT2(I_grave) EMIT2(I_acute)
+ EMIT2(I_circumflex) EMIT2(I_diaeresis)
+ EMIT2(0x128) EMIT2(0x12a) EMIT2(0x12c)
+ EMIT2(0x12e) EMIT2(0x130) EMIT2(0x197)
+ EMIT2(0x1cf) EMIT2(0x208) EMIT2(0x20a)
+ EMIT2(0x1e2c) EMIT2(0x1e2e) EMIT2(0x1ec8)
+ EMIT2(0x1eca)
+ return OK;
+
+ case 'J': case 0x134: case 0x248:
+ EMIT2('J') EMIT2(0x134) EMIT2(0x248)
+ return OK;
+
+ case 'K': case 0x136: case 0x198: case 0x1e8: case 0x1e30:
+ case 0x1e32: case 0x1e34: case 0x2c69: case 0xa740:
+ EMIT2('K') EMIT2(0x136) EMIT2(0x198) EMIT2(0x1e8)
+ EMIT2(0x1e30) EMIT2(0x1e32) EMIT2(0x1e34)
+ EMIT2(0x2c69) EMIT2(0xa740)
+ return OK;
+
+ case 'L': case 0x139: case 0x13b: case 0x13d:
+ case 0x13f: case 0x141: case 0x23d: case 0x1e36:
+ case 0x1e38: case 0x1e3a: case 0x1e3c: case 0x2c60:
+ EMIT2('L') EMIT2(0x139) EMIT2(0x13b)
+ EMIT2(0x13d) EMIT2(0x13f) EMIT2(0x141)
+ EMIT2(0x23d) EMIT2(0x1e36) EMIT2(0x1e38)
+ EMIT2(0x1e3a) EMIT2(0x1e3c) EMIT2(0x2c60)
+ return OK;
+
+ case 'M': case 0x1e3e: case 0x1e40: case 0x1e42:
+ EMIT2('M') EMIT2(0x1e3e) EMIT2(0x1e40)
+ EMIT2(0x1e42)
+ return OK;
+
+ case 'N': case N_virguilla:
+ case 0x143: case 0x145: case 0x147: case 0x1f8:
+ case 0x1e44: case 0x1e46: case 0x1e48: case 0x1e4a:
+ case 0xa7a4:
+ EMIT2('N') EMIT2(N_virguilla)
+ EMIT2(0x143) EMIT2(0x145) EMIT2(0x147)
+ EMIT2(0x1f8) EMIT2(0x1e44) EMIT2(0x1e46)
+ EMIT2(0x1e48) EMIT2(0x1e4a) EMIT2(0xa7a4)
+ return OK;
+
+ case 'O': case O_grave: case O_acute: case O_circumflex:
+ case O_virguilla: case O_diaeresis: case O_slash:
+ case 0x14c: case 0x14e: case 0x150: case 0x19f:
+ case 0x1a0: case 0x1d1: case 0x1ea: case 0x1ec:
+ case 0x1fe: case 0x20c: case 0x20e: case 0x22a:
+ case 0x22c: case 0x22e: case 0x230: case 0x1e4c:
+ case 0x1e4e: case 0x1e50: case 0x1e52: case 0x1ecc:
+ case 0x1ece: case 0x1ed0: case 0x1ed2: case 0x1ed4:
+ case 0x1ed6: case 0x1ed8: case 0x1eda: case 0x1edc:
+ case 0x1ede: case 0x1ee0: case 0x1ee2:
+ EMIT2('O') EMIT2(O_grave) EMIT2(O_acute)
+ EMIT2(O_circumflex) EMIT2(O_virguilla)
+ EMIT2(O_diaeresis) EMIT2(O_slash)
+ EMIT2(0x14c) EMIT2(0x14e) EMIT2(0x150)
+ EMIT2(0x19f) EMIT2(0x1a0) EMIT2(0x1d1)
+ EMIT2(0x1ea) EMIT2(0x1ec) EMIT2(0x1fe)
+ EMIT2(0x20c) EMIT2(0x20e) EMIT2(0x22a)
+ EMIT2(0x22c) EMIT2(0x22e) EMIT2(0x230)
+ EMIT2(0x1e4c) EMIT2(0x1e4e) EMIT2(0x1e50)
+ EMIT2(0x1e52) EMIT2(0x1ecc) EMIT2(0x1ece)
+ EMIT2(0x1ed0) EMIT2(0x1ed2) EMIT2(0x1ed4)
+ EMIT2(0x1ed6) EMIT2(0x1ed8) EMIT2(0x1eda)
+ EMIT2(0x1edc) EMIT2(0x1ede) EMIT2(0x1ee0)
+ EMIT2(0x1ee2)
+ return OK;
+
+ case 'P': case 0x1a4: case 0x1e54: case 0x1e56: case 0x2c63:
+ EMIT2('P') EMIT2(0x1a4) EMIT2(0x1e54) EMIT2(0x1e56)
+ EMIT2(0x2c63)
+ return OK;
+
+ case 'Q': case 0x24a:
+ EMIT2('Q') EMIT2(0x24a)
+ return OK;
+
+ case 'R': case 0x154: case 0x156: case 0x158: case 0x210:
+ case 0x212: case 0x24c: case 0x1e58: case 0x1e5a:
+ case 0x1e5c: case 0x1e5e: case 0x2c64: case 0xa7a6:
+ EMIT2('R') EMIT2(0x154) EMIT2(0x156) EMIT2(0x158)
+ EMIT2(0x210) EMIT2(0x212) EMIT2(0x24c) EMIT2(0x1e58)
+ EMIT2(0x1e5a) EMIT2(0x1e5c) EMIT2(0x1e5e) EMIT2(0x2c64)
+ EMIT2(0xa7a6)
+ return OK;
+
+ case 'S': case 0x15a: case 0x15c: case 0x15e: case 0x160:
+ case 0x218: case 0x1e60: case 0x1e62: case 0x1e64:
+ case 0x1e66: case 0x1e68: case 0x2c7e: case 0xa7a8:
+ EMIT2('S') EMIT2(0x15a) EMIT2(0x15c) EMIT2(0x15e)
+ EMIT2(0x160) EMIT2(0x218) EMIT2(0x1e60) EMIT2(0x1e62)
+ EMIT2(0x1e64) EMIT2(0x1e66) EMIT2(0x1e68) EMIT2(0x2c7e)
+ EMIT2(0xa7a8)
+ return OK;
+
+ case 'T': case 0x162: case 0x164: case 0x166: case 0x1ac:
+ case 0x1ae: case 0x21a: case 0x23e: case 0x1e6a: case 0x1e6c:
+ case 0x1e6e: case 0x1e70:
+ EMIT2('T') EMIT2(0x162) EMIT2(0x164) EMIT2(0x166)
+ EMIT2(0x1ac) EMIT2(0x1ae) EMIT2(0x23e) EMIT2(0x21a)
+ EMIT2(0x1e6a) EMIT2(0x1e6c) EMIT2(0x1e6e) EMIT2(0x1e70)
+ return OK;
+
+ case 'U': case U_grave: case U_acute: case U_diaeresis:
+ case U_circumflex: case 0x168: case 0x16a: case 0x16c:
+ case 0x16e: case 0x170: case 0x172: case 0x1af:
+ case 0x1d3: case 0x1d5: case 0x1d7: case 0x1d9:
+ case 0x1db: case 0x214: case 0x216: case 0x244:
+ case 0x1e72: case 0x1e74: case 0x1e76: case 0x1e78:
+ case 0x1e7a: case 0x1ee4: case 0x1ee6: case 0x1ee8:
+ case 0x1eea: case 0x1eec: case 0x1eee: case 0x1ef0:
+ EMIT2('U') EMIT2(U_grave) EMIT2(U_acute)
+ EMIT2(U_diaeresis) EMIT2(U_circumflex)
+ EMIT2(0x168) EMIT2(0x16a)
+ EMIT2(0x16c) EMIT2(0x16e) EMIT2(0x170)
+ EMIT2(0x172) EMIT2(0x1af) EMIT2(0x1d3)
+ EMIT2(0x1d5) EMIT2(0x1d7) EMIT2(0x1d9)
+ EMIT2(0x1db) EMIT2(0x214) EMIT2(0x216)
+ EMIT2(0x244) EMIT2(0x1e72) EMIT2(0x1e74)
+ EMIT2(0x1e76) EMIT2(0x1e78) EMIT2(0x1e7a)
+ EMIT2(0x1ee4) EMIT2(0x1ee6) EMIT2(0x1ee8)
+ EMIT2(0x1eea) EMIT2(0x1eec) EMIT2(0x1eee)
+ EMIT2(0x1ef0)
+ return OK;
+
+ case 'V': case 0x1b2: case 0x1e7c: case 0x1e7e:
+ EMIT2('V') EMIT2(0x1b2) EMIT2(0x1e7c) EMIT2(0x1e7e)
+ return OK;
+
+ case 'W': case 0x174: case 0x1e80: case 0x1e82: case 0x1e84:
+ case 0x1e86: case 0x1e88:
+ EMIT2('W') EMIT2(0x174) EMIT2(0x1e80) EMIT2(0x1e82)
+ EMIT2(0x1e84) EMIT2(0x1e86) EMIT2(0x1e88)
+ return OK;
+
+ case 'X': case 0x1e8a: case 0x1e8c:
+ EMIT2('X') EMIT2(0x1e8a) EMIT2(0x1e8c)
+ return OK;
+
+ case 'Y': case Y_acute: case 0x176: case 0x178:
+ case 0x1b3: case 0x232: case 0x24e: case 0x1e8e:
+ case 0x1ef2: case 0x1ef4: case 0x1ef6: case 0x1ef8:
+ EMIT2('Y') EMIT2(Y_acute)
+ EMIT2(0x176) EMIT2(0x178) EMIT2(0x1b3)
+ EMIT2(0x232) EMIT2(0x24e) EMIT2(0x1e8e)
+ EMIT2(0x1ef2) EMIT2(0x1ef4) EMIT2(0x1ef6)
+ EMIT2(0x1ef8)
+ return OK;
+
+ case 'Z': case 0x179: case 0x17b: case 0x17d:
+ case 0x1b5: case 0x1e90: case 0x1e92: case 0x1e94:
+ case 0x2c6b:
+ EMIT2('Z') EMIT2(0x179) EMIT2(0x17b) EMIT2(0x17d)
+ EMIT2(0x1b5) EMIT2(0x1e90) EMIT2(0x1e92)
+ EMIT2(0x1e94) EMIT2(0x2c6b)
+ return OK;
+
+ case 'a': case a_grave: case a_acute: case a_circumflex:
+ case a_virguilla: case a_diaeresis: case a_ring:
+ case 0x101: case 0x103: case 0x105: case 0x1ce:
+ case 0x1df: case 0x1e1: case 0x1fb: case 0x201:
+ case 0x203: case 0x227: case 0x1d8f: case 0x1e01:
+ case 0x1e9a: case 0x1ea1: case 0x1ea3: case 0x1ea5:
+ case 0x1ea7: case 0x1ea9: case 0x1eab: case 0x1ead:
+ case 0x1eaf: case 0x1eb1: case 0x1eb3: case 0x1eb5:
+ case 0x1eb7: case 0x2c65:
+ EMIT2('a') EMIT2(a_grave) EMIT2(a_acute)
+ EMIT2(a_circumflex) EMIT2(a_virguilla)
+ EMIT2(a_diaeresis) EMIT2(a_ring)
+ EMIT2(0x101) EMIT2(0x103) EMIT2(0x105)
+ EMIT2(0x1ce) EMIT2(0x1df) EMIT2(0x1e1)
+ EMIT2(0x1fb) EMIT2(0x201) EMIT2(0x203)
+ EMIT2(0x227) EMIT2(0x1d8f) EMIT2(0x1e01)
+ EMIT2(0x1e9a) EMIT2(0x1ea1) EMIT2(0x1ea3)
+ EMIT2(0x1ea5) EMIT2(0x1ea7) EMIT2(0x1ea9)
+ EMIT2(0x1eab) EMIT2(0x1ead) EMIT2(0x1eaf)
+ EMIT2(0x1eb1) EMIT2(0x1eb3) EMIT2(0x1eb5)
+ EMIT2(0x1eb7) EMIT2(0x2c65)
+ return OK;
+
+ case 'b': case 0x180: case 0x253: case 0x1d6c: case 0x1d80:
+ case 0x1e03: case 0x1e05: case 0x1e07:
+ EMIT2('b') EMIT2(0x180) EMIT2(0x253) EMIT2(0x1d6c)
+ EMIT2(0x1d80) EMIT2(0x1e03) EMIT2(0x1e05) EMIT2(0x1e07)
+ return OK;
+
+ case 'c': case c_cedilla: case 0x107: case 0x109: case 0x10b:
+ case 0x10d: case 0x188: case 0x23c: case 0x1e09: case 0xa793:
+ case 0xa794:
+ EMIT2('c') EMIT2(c_cedilla)
+ EMIT2(0x107) EMIT2(0x109) EMIT2(0x10b)
+ EMIT2(0x10d) EMIT2(0x188) EMIT2(0x23c)
+ EMIT2(0x1e09) EMIT2(0xa793) EMIT2(0xa794)
+ return OK;
+
+ case 'd': case 0x10f: case 0x111: case 0x257: case 0x1d6d:
+ case 0x1d81: case 0x1d91: case 0x1e0b: case 0x1e0d: case 0x1e0f:
+ case 0x1e11: case 0x1e13:
+ EMIT2('d') EMIT2(0x10f) EMIT2(0x111)
+ EMIT2(0x257) EMIT2(0x1d6d) EMIT2(0x1d81)
+ EMIT2(0x1d91) EMIT2(0x1e0b) EMIT2(0x1e0d)
+ EMIT2(0x1e0f) EMIT2(0x1e11) EMIT2(0x1e13)
+ return OK;
+
+ case 'e': case e_grave: case e_acute: case e_circumflex:
+ case e_diaeresis: case 0x113: case 0x115: case 0x117:
+ case 0x119: case 0x11b: case 0x205: case 0x207:
+ case 0x229: case 0x247: case 0x1d92: case 0x1e15:
+ case 0x1e17: case 0x1e19: case 0x1e1b: case 0x1e1d:
+ case 0x1eb9: case 0x1ebb: case 0x1ebd: case 0x1ebf:
+ case 0x1ec1: case 0x1ec3: case 0x1ec5: case 0x1ec7:
+ EMIT2('e') EMIT2(e_grave) EMIT2(e_acute)
+ EMIT2(e_circumflex) EMIT2(e_diaeresis)
+ EMIT2(0x113) EMIT2(0x115)
+ EMIT2(0x117) EMIT2(0x119) EMIT2(0x11b)
+ EMIT2(0x205) EMIT2(0x207) EMIT2(0x229)
+ EMIT2(0x247) EMIT2(0x1d92) EMIT2(0x1e15)
+ EMIT2(0x1e17) EMIT2(0x1e19) EMIT2(0x1e1b)
+ EMIT2(0x1e1d) EMIT2(0x1eb9) EMIT2(0x1ebb)
+ EMIT2(0x1ebd) EMIT2(0x1ebf) EMIT2(0x1ec1)
+ EMIT2(0x1ec3) EMIT2(0x1ec5) EMIT2(0x1ec7)
+ return OK;
+
+ case 'f': case 0x192: case 0x1d6e: case 0x1d82:
+ case 0x1e1f: case 0xa799:
+ EMIT2('f') EMIT2(0x192) EMIT2(0x1d6e) EMIT2(0x1d82)
+ EMIT2(0x1e1f) EMIT2(0xa799)
+ return OK;
+
+ case 'g': case 0x11d: case 0x11f: case 0x121: case 0x123:
+ case 0x1e5: case 0x1e7: case 0x1f5: case 0x260: case 0x1d83:
+ case 0x1e21: case 0xa7a1:
+ EMIT2('g') EMIT2(0x11d) EMIT2(0x11f) EMIT2(0x121)
+ EMIT2(0x123) EMIT2(0x1e5) EMIT2(0x1e7)
+ EMIT2(0x1f5) EMIT2(0x260) EMIT2(0x1d83)
+ EMIT2(0x1e21) EMIT2(0xa7a1)
+ return OK;
+
+ case 'h': case 0x125: case 0x127: case 0x21f: case 0x1e23:
+ case 0x1e25: case 0x1e27: case 0x1e29: case 0x1e2b:
+ case 0x1e96: case 0x2c68: case 0xa795:
+ EMIT2('h') EMIT2(0x125) EMIT2(0x127) EMIT2(0x21f)
+ EMIT2(0x1e23) EMIT2(0x1e25) EMIT2(0x1e27)
+ EMIT2(0x1e29) EMIT2(0x1e2b) EMIT2(0x1e96)
+ EMIT2(0x2c68) EMIT2(0xa795)
+ return OK;
+
+ case 'i': case i_grave: case i_acute: case i_circumflex:
+ case i_diaeresis: case 0x129: case 0x12b: case 0x12d:
+ case 0x12f: case 0x1d0: case 0x209: case 0x20b:
+ case 0x268: case 0x1d96: case 0x1e2d: case 0x1e2f:
+ case 0x1ec9: case 0x1ecb:
+ EMIT2('i') EMIT2(i_grave) EMIT2(i_acute)
+ EMIT2(i_circumflex) EMIT2(i_diaeresis)
+ EMIT2(0x129) EMIT2(0x12b) EMIT2(0x12d)
+ EMIT2(0x12f) EMIT2(0x1d0) EMIT2(0x209)
+ EMIT2(0x20b) EMIT2(0x268) EMIT2(0x1d96)
+ EMIT2(0x1e2d) EMIT2(0x1e2f) EMIT2(0x1ec9)
+ EMIT2(0x1ecb) EMIT2(0x1ecb)
+ return OK;
+
+ case 'j': case 0x135: case 0x1f0: case 0x249:
+ EMIT2('j') EMIT2(0x135) EMIT2(0x1f0) EMIT2(0x249)
+ return OK;
+
+ case 'k': case 0x137: case 0x199: case 0x1e9: case 0x1d84:
+ case 0x1e31: case 0x1e33: case 0x1e35: case 0x2c6a: case 0xa741:
+ EMIT2('k') EMIT2(0x137) EMIT2(0x199) EMIT2(0x1e9)
+ EMIT2(0x1d84) EMIT2(0x1e31) EMIT2(0x1e33)
+ EMIT2(0x1e35) EMIT2(0x2c6a) EMIT2(0xa741)
+ return OK;
+
+ case 'l': case 0x13a: case 0x13c: case 0x13e: case 0x140:
+ case 0x142: case 0x19a: case 0x1e37: case 0x1e39: case 0x1e3b:
+ case 0x1e3d: case 0x2c61:
+ EMIT2('l') EMIT2(0x13a) EMIT2(0x13c)
+ EMIT2(0x13e) EMIT2(0x140) EMIT2(0x142)
+ EMIT2(0x19a) EMIT2(0x1e37) EMIT2(0x1e39)
+ EMIT2(0x1e3b) EMIT2(0x1e3d) EMIT2(0x2c61)
+ return OK;
+
+ case 'm': case 0x1d6f: case 0x1e3f: case 0x1e41: case 0x1e43:
+ EMIT2('m') EMIT2(0x1d6f) EMIT2(0x1e3f)
+ EMIT2(0x1e41) EMIT2(0x1e43)
+ return OK;
+
+ case 'n': case n_virguilla: case 0x144: case 0x146: case 0x148:
+ case 0x149: case 0x1f9: case 0x1d70: case 0x1d87: case 0x1e45:
+ case 0x1e47: case 0x1e49: case 0x1e4b: case 0xa7a5:
+ EMIT2('n') EMIT2(n_virguilla)
+ EMIT2(0x144) EMIT2(0x146) EMIT2(0x148)
+ EMIT2(0x149) EMIT2(0x1f9) EMIT2(0x1d70)
+ EMIT2(0x1d87) EMIT2(0x1e45) EMIT2(0x1e47)
+ EMIT2(0x1e49) EMIT2(0x1e4b) EMIT2(0xa7a5)
+ return OK;
+
+ case 'o': case o_grave: case o_acute: case o_circumflex:
+ case o_virguilla: case o_diaeresis: case o_slash:
+ case 0x14d: case 0x14f: case 0x151: case 0x1a1:
+ case 0x1d2: case 0x1eb: case 0x1ed: case 0x1ff:
+ case 0x20d: case 0x20f: case 0x22b: case 0x22d:
+ case 0x22f: case 0x231: case 0x275: case 0x1e4d:
+ case 0x1e4f: case 0x1e51: case 0x1e53: case 0x1ecd:
+ case 0x1ecf: case 0x1ed1: case 0x1ed3: case 0x1ed5:
+ case 0x1ed7: case 0x1ed9: case 0x1edb: case 0x1edd:
+ case 0x1edf: case 0x1ee1: case 0x1ee3:
+ EMIT2('o') EMIT2(o_grave) EMIT2(o_acute)
+ EMIT2(o_circumflex) EMIT2(o_virguilla)
+ EMIT2(o_diaeresis) EMIT2(o_slash)
+ EMIT2(0x14d) EMIT2(0x14f) EMIT2(0x151)
+ EMIT2(0x1a1) EMIT2(0x1d2) EMIT2(0x1eb)
+ EMIT2(0x1ed) EMIT2(0x1ff) EMIT2(0x20d)
+ EMIT2(0x20f) EMIT2(0x22b) EMIT2(0x22d)
+ EMIT2(0x22f) EMIT2(0x231) EMIT2(0x275)
+ EMIT2(0x1e4d) EMIT2(0x1e4f) EMIT2(0x1e51)
+ EMIT2(0x1e53) EMIT2(0x1ecd) EMIT2(0x1ecf)
+ EMIT2(0x1ed1) EMIT2(0x1ed3) EMIT2(0x1ed5)
+ EMIT2(0x1ed7) EMIT2(0x1ed9) EMIT2(0x1edb)
+ EMIT2(0x1edd) EMIT2(0x1edf) EMIT2(0x1ee1)
+ EMIT2(0x1ee3)
+ return OK;
+
+ case 'p': case 0x1a5: case 0x1d71: case 0x1d7d: case 0x1d88:
+ case 0x1e55: case 0x1e57:
+ EMIT2('p') EMIT2(0x1a5) EMIT2(0x1d71) EMIT2(0x1d7d)
+ EMIT2(0x1d88) EMIT2(0x1e55) EMIT2(0x1e57)
+ return OK;
+
+ case 'q': case 0x24b: case 0x2a0:
+ EMIT2('q') EMIT2(0x24b) EMIT2(0x2a0)
+ return OK;
+
+ case 'r': case 0x155: case 0x157: case 0x159: case 0x211:
+ case 0x213: case 0x24d: case 0x27d: case 0x1d72: case 0x1d73:
+ case 0x1d89: case 0x1e59: case 0x1e5b: case 0x1e5d: case 0x1e5f:
+ case 0xa7a7:
+ EMIT2('r') EMIT2(0x155) EMIT2(0x157) EMIT2(0x159)
+ EMIT2(0x211) EMIT2(0x213) EMIT2(0x24d) EMIT2(0x27d)
+ EMIT2(0x1d72) EMIT2(0x1d73) EMIT2(0x1d89) EMIT2(0x1e59)
+ EMIT2(0x1e5b) EMIT2(0x1e5d) EMIT2(0x1e5f) EMIT2(0xa7a7)
+ return OK;
+
+ case 's': case 0x15b: case 0x15d: case 0x15f: case 0x161:
+ case 0x219: case 0x23f: case 0x1d74: case 0x1d8a: case 0x1e61:
+ case 0x1e63: case 0x1e65: case 0x1e67: case 0x1e69: case 0xa7a9:
+ EMIT2('s') EMIT2(0x15b) EMIT2(0x15d) EMIT2(0x15f)
+ EMIT2(0x161) EMIT2(0x219) EMIT2(0x23f) EMIT2(0x1d74)
+ EMIT2(0x1d8a) EMIT2(0x1e61) EMIT2(0x1e63) EMIT2(0x1e65)
+ EMIT2(0x1e67) EMIT2(0x1e69) EMIT2(0xa7a9)
+ return OK;
+
+ case 't': case 0x163: case 0x165: case 0x167: case 0x1ab:
+ case 0x1ad: case 0x21b: case 0x288: case 0x1d75: case 0x1e6b:
+ case 0x1e6d: case 0x1e6f: case 0x1e71: case 0x1e97: case 0x2c66:
+ EMIT2('t') EMIT2(0x163) EMIT2(0x165) EMIT2(0x167)
+ EMIT2(0x1ab) EMIT2(0x1ad) EMIT2(0x21b) EMIT2(0x288)
+ EMIT2(0x1d75) EMIT2(0x1e6b) EMIT2(0x1e6d) EMIT2(0x1e6f)
+ EMIT2(0x1e71) EMIT2(0x1e97) EMIT2(0x2c66)
+ return OK;
+
+ case 'u': case u_grave: case u_acute: case u_circumflex:
+ case u_diaeresis: case 0x169: case 0x16b: case 0x16d:
+ case 0x16f: case 0x171: case 0x173: case 0x1b0: case 0x1d4:
+ case 0x1d6: case 0x1d8: case 0x1da: case 0x1dc: case 0x215:
+ case 0x217: case 0x289: case 0x1d7e: case 0x1d99: case 0x1e73:
+ case 0x1e75: case 0x1e77: case 0x1e79: case 0x1e7b:
+ case 0x1ee5: case 0x1ee7: case 0x1ee9: case 0x1eeb:
+ case 0x1eed: case 0x1eef: case 0x1ef1:
+ EMIT2('u') EMIT2(u_grave) EMIT2(u_acute)
+ EMIT2(u_circumflex) EMIT2(u_diaeresis)
+ EMIT2(0x169) EMIT2(0x16b)
+ EMIT2(0x16d) EMIT2(0x16f) EMIT2(0x171)
+ EMIT2(0x173) EMIT2(0x1d6) EMIT2(0x1d8)
+ EMIT2(0x215) EMIT2(0x217) EMIT2(0x1b0)
+ EMIT2(0x1d4) EMIT2(0x1da) EMIT2(0x1dc)
+ EMIT2(0x289) EMIT2(0x1e73) EMIT2(0x1d7e)
+ EMIT2(0x1d99) EMIT2(0x1e75) EMIT2(0x1e77)
+ EMIT2(0x1e79) EMIT2(0x1e7b) EMIT2(0x1ee5)
+ EMIT2(0x1ee7) EMIT2(0x1ee9) EMIT2(0x1eeb)
+ EMIT2(0x1eed) EMIT2(0x1eef) EMIT2(0x1ef1)
+ return OK;
+
+ case 'v': case 0x28b: case 0x1d8c: case 0x1e7d: case 0x1e7f:
+ EMIT2('v') EMIT2(0x28b) EMIT2(0x1d8c) EMIT2(0x1e7d)
+ EMIT2(0x1e7f)
+ return OK;
+
+ case 'w': case 0x175: case 0x1e81: case 0x1e83: case 0x1e85:
+ case 0x1e87: case 0x1e89: case 0x1e98:
+ EMIT2('w') EMIT2(0x175) EMIT2(0x1e81) EMIT2(0x1e83)
+ EMIT2(0x1e85) EMIT2(0x1e87) EMIT2(0x1e89) EMIT2(0x1e98)
+ return OK;
+
+ case 'x': case 0x1e8b: case 0x1e8d:
+ EMIT2('x') EMIT2(0x1e8b) EMIT2(0x1e8d)
+ return OK;
+
+ case 'y': case y_acute: case y_diaeresis: case 0x177:
+ case 0x1b4: case 0x233: case 0x24f: case 0x1e8f:
+ case 0x1e99: case 0x1ef3: case 0x1ef5: case 0x1ef7:
+ case 0x1ef9:
+ EMIT2('y') EMIT2(y_acute) EMIT2(y_diaeresis)
+ EMIT2(0x177) EMIT2(0x1b4) EMIT2(0x233) EMIT2(0x24f)
+ EMIT2(0x1e8f) EMIT2(0x1e99) EMIT2(0x1ef3)
+ EMIT2(0x1ef5) EMIT2(0x1ef7) EMIT2(0x1ef9)
+ return OK;
+
+ case 'z': case 0x17a: case 0x17c: case 0x17e: case 0x1b6:
+ case 0x1d76: case 0x1d8e: case 0x1e91: case 0x1e93:
+ case 0x1e95: case 0x2c6c:
+ EMIT2('z') EMIT2(0x17a) EMIT2(0x17c) EMIT2(0x17e)
+ EMIT2(0x1b6) EMIT2(0x1d76) EMIT2(0x1d8e) EMIT2(0x1e91)
+ EMIT2(0x1e93) EMIT2(0x1e95) EMIT2(0x2c6c)
+ return OK;
+
+ // default: character itself
+ }
+ }
+
+ EMIT2(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.
+ */
+
+/*
+ * 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(void)
+{
+ int c;
+ int charclass;
+ int equiclass;
+ int collclass;
+ int got_coll_char;
+ char_u *p;
+ char_u *endp;
+ char_u *old_regparse = regparse;
+ int extra = 0;
+ int emit_range;
+ int negated;
+ int result;
+ int startc = -1;
+ int save_prev_at_start = prev_at_start;
+
+ c = getchr();
+ switch (c)
+ {
+ case NUL:
+ EMSG_RET_FAIL(_(e_nfa_regexp_end_encountered_prematurely));
+
+ case Magic('^'):
+ EMIT(NFA_BOL);
+ break;
+
+ case Magic('$'):
+ EMIT(NFA_EOL);
+#if defined(FEAT_SYN_HL) || defined(PROTO)
+ had_eol = TRUE;
+#endif
+ break;
+
+ case Magic('<'):
+ EMIT(NFA_BOW);
+ break;
+
+ case Magic('>'):
+ EMIT(NFA_EOW);
+ break;
+
+ case Magic('_'):
+ c = no_Magic(getchr());
+ if (c == NUL)
+ EMSG_RET_FAIL(_(e_nfa_regexp_end_encountered_prematurely));
+
+ if (c == '^') // "\_^" is start-of-line
+ {
+ EMIT(NFA_BOL);
+ break;
+ }
+ if (c == '$') // "\_$" is end-of-line
+ {
+ EMIT(NFA_EOL);
+#if defined(FEAT_SYN_HL) || defined(PROTO)
+ had_eol = TRUE;
+#endif
+ break;
+ }
+
+ extra = NFA_ADD_NL;
+
+ // "\_[" is collection plus newline
+ if (c == '[')
+ goto collection;
+
+ // "\_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)
+ {
+ if (extra == NFA_ADD_NL)
+ {
+ semsg(_(e_nfa_regexp_invalid_character_class_nr), c);
+ rc_did_emsg = TRUE;
+ return FAIL;
+ }
+ siemsg("INTERNAL: Unknown character class char: %d", c);
+ return FAIL;
+ }
+
+ // 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()))
+ {
+ old_regparse = regparse;
+ c = getchr();
+ goto nfa_do_multibyte;
+ }
+ EMIT(nfa_classcodes[p - classchars]);
+ if (extra == NFA_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 Magic('|'):
+ case Magic('&'):
+ case Magic(')'):
+ semsg(_(e_nfa_regexp_misplaced_chr), 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
+ semsg(_(e_nfa_regexp_misplaced_chr), no_Magic(c));
+ return FAIL;
+
+ case Magic('~'):
+ {
+ char_u *lp;
+
+ // Previous substitute pattern.
+ // Generated as "\%(pattern\)".
+ if (reg_prev_sub == NULL)
+ {
+ emsg(_(e_no_previous_substitute_regular_expression));
+ return FAIL;
+ }
+ for (lp = reg_prev_sub; *lp != NUL; MB_CPTR_ADV(lp))
+ {
+ EMIT(PTR2CHAR(lp));
+ if (lp != reg_prev_sub)
+ EMIT(NFA_CONCAT);
+ }
+ EMIT(NFA_NOPEN);
+ break;
+ }
+
+ 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'):
+ {
+ int refnum = no_Magic(c) - '1';
+
+ if (!seen_endbrace(refnum + 1))
+ return FAIL;
+ EMIT(NFA_BACKREF1 + refnum);
+ rex.nfa_has_backref = TRUE;
+ }
+ break;
+
+ case Magic('z'):
+ c = no_Magic(getchr());
+ switch (c)
+ {
+ case 's':
+ EMIT(NFA_ZSTART);
+ if (re_mult_next("\\zs") == FAIL)
+ return FAIL;
+ break;
+ case 'e':
+ EMIT(NFA_ZEND);
+ rex.nfa_has_zend = TRUE;
+ if (re_mult_next("\\ze") == FAIL)
+ return FAIL;
+ break;
+#ifdef FEAT_SYN_HL
+ case '1':
+ case '2':
+ case '3':
+ case '4':
+ case '5':
+ case '6':
+ case '7':
+ case '8':
+ case '9':
+ // \z1...\z9
+ if ((reg_do_extmatch & REX_USE) == 0)
+ EMSG_RET_FAIL(_(e_z1_z9_not_allowed_here));
+ EMIT(NFA_ZREF1 + (no_Magic(c) - '1'));
+ // No need to set rex.nfa_has_backref, the sub-matches don't
+ // change when \z1 .. \z9 matches or not.
+ re_has_z = REX_USE;
+ break;
+ case '(':
+ // \z(
+ if ((reg_do_extmatch & REX_SET) == 0)
+ EMSG_RET_FAIL(_(e_z_not_allowed_here));
+ if (nfa_reg(REG_ZPAREN) == FAIL)
+ return FAIL; // cascaded error
+ re_has_z = REX_SET;
+ break;
+#endif
+ default:
+ semsg(_(e_nfa_regexp_unknown_operator_z_chr), 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
+ {
+ long nr;
+
+ switch (c)
+ {
+ case 'd': nr = getdecchrs(); break;
+ case 'o': nr = getoctchrs(); break;
+ case 'x': nr = gethexchrs(2); break;
+ case 'u': nr = gethexchrs(4); break;
+ case 'U': nr = gethexchrs(8); break;
+ default: nr = -1; break;
+ }
+
+ if (nr < 0 || nr > INT_MAX)
+ EMSG2_RET_FAIL(_(e_invalid_character_after_str_2),
+ reg_magic == MAGIC_ALL);
+ // A NUL is stored in the text as NL
+ // TODO: what if a composing character follows?
+ EMIT(nr == 0 ? 0x0a : nr);
+ }
+ break;
+
+ // Catch \%^ and \%$ regardless of where they appear in the
+ // pattern -- regardless of whether or not it makes sense.
+ case '^':
+ EMIT(NFA_BOF);
+ break;
+
+ case '$':
+ EMIT(NFA_EOF);
+ break;
+
+ case '#':
+ if (regparse[0] == '=' && regparse[1] >= 48
+ && regparse[1] <= 50)
+ {
+ // misplaced \%#=1
+ semsg(_(e_atom_engine_must_be_at_start_of_pattern),
+ regparse[1]);
+ return FAIL;
+ }
+ EMIT(NFA_CURSOR);
+ break;
+
+ case 'V':
+ EMIT(NFA_VISUAL);
+ break;
+
+ case 'C':
+ EMIT(NFA_ANY_COMPOSING);
+ break;
+
+ case '[':
+ {
+ int n;
+
+ // \%[abc]
+ for (n = 0; (c = peekchr()) != ']'; ++n)
+ {
+ if (c == NUL)
+ EMSG2_RET_FAIL(_(e_missing_sb_after_str),
+ reg_magic == MAGIC_ALL);
+ // recursive call!
+ if (nfa_regatom() == FAIL)
+ return FAIL;
+ }
+ getchr(); // get the ]
+ if (n == 0)
+ EMSG2_RET_FAIL(_(e_empty_str_brackets),
+ reg_magic == MAGIC_ALL);
+ EMIT(NFA_OPT_CHARS);
+ EMIT(n);
+
+ // Emit as "\%(\%[abc]\)" to be able to handle
+ // "\%[abc]*" which would cause the empty string to be
+ // matched an unlimited number of times. NFA_NOPEN is
+ // added only once at a position, while NFA_SPLIT is
+ // added multiple times. This is more efficient than
+ // not allowing NFA_SPLIT multiple times, it is used
+ // a lot.
+ EMIT(NFA_NOPEN);
+ break;
+ }
+
+ default:
+ {
+ long_u n = 0;
+ int cmp = c;
+ int cur = FALSE;
+ int got_digit = FALSE;
+
+ if (c == '<' || c == '>')
+ c = getchr();
+ if (no_Magic(c) == '.')
+ {
+ cur = TRUE;
+ c = getchr();
+ }
+ while (VIM_ISDIGIT(c))
+ {
+ long_u tmp;
+
+ if (cur)
+ {
+ semsg(_(e_regexp_number_after_dot_pos_search_chr),
+ no_Magic(c));
+ return FAIL;
+ }
+ tmp = n * 10 + (c - '0');
+
+ if (tmp < n)
+ {
+ // overflow.
+ emsg(_(e_percent_value_too_large));
+ return FAIL;
+ }
+ n = tmp;
+ c = getchr();
+ got_digit = TRUE;
+ }
+ if (c == 'l' || c == 'c' || c == 'v')
+ {
+ long_u limit = INT_MAX;
+
+ if (!cur && !got_digit)
+ {
+ semsg(_(e_nfa_regexp_missing_value_in_chr),
+ no_Magic(c));
+ return FAIL;
+ }
+ if (c == 'l')
+ {
+ if (cur)
+ n = curwin->w_cursor.lnum;
+ // \%{n}l \%{n}<l \%{n}>l
+ EMIT(cmp == '<' ? NFA_LNUM_LT :
+ cmp == '>' ? NFA_LNUM_GT : NFA_LNUM);
+ if (save_prev_at_start)
+ at_start = TRUE;
+ }
+ else if (c == 'c')
+ {
+ if (cur)
+ {
+ n = curwin->w_cursor.col;
+ n++;
+ }
+ // \%{n}c \%{n}<c \%{n}>c
+ EMIT(cmp == '<' ? NFA_COL_LT :
+ cmp == '>' ? NFA_COL_GT : NFA_COL);
+ }
+ else
+ {
+ if (cur)
+ {
+ colnr_T vcol = 0;
+
+ getvvcol(curwin, &curwin->w_cursor,
+ NULL, NULL, &vcol);
+ n = ++vcol;
+ }
+ // \%{n}v \%{n}<v \%{n}>v
+ EMIT(cmp == '<' ? NFA_VCOL_LT :
+ cmp == '>' ? NFA_VCOL_GT : NFA_VCOL);
+ limit = INT_MAX / MB_MAXBYTES;
+ }
+ if (n >= limit)
+ {
+ emsg(_(e_percent_value_too_large));
+ return FAIL;
+ }
+ EMIT((int)n);
+ break;
+ }
+ else if (c == '\'' && n == 0)
+ {
+ // \%'m \%<'m \%>'m
+ EMIT(cmp == '<' ? NFA_MARK_LT :
+ cmp == '>' ? NFA_MARK_GT : NFA_MARK);
+ EMIT(getchr());
+ break;
+ }
+ }
+ semsg(_(e_nfa_regexp_unknown_operator_percent_chr),
+ no_Magic(c));
+ return FAIL;
+ }
+ break;
+
+ case Magic('['):
+collection:
+ /*
+ * [abc] uses NFA_START_COLL - NFA_END_COLL
+ * [^abc] uses NFA_START_NEG_COLL - NFA_END_NEG_COLL
+ * Each character is produced as a regular state, using
+ * NFA_CONCAT to bind them together.
+ * Besides normal characters there can be:
+ * - character classes NFA_CLASS_*
+ * - ranges, two characters followed by NFA_RANGE.
+ */
+
+ 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_] for \h,
+ * and perform the necessary substitutions in the NFA.
+ */
+ result = nfa_recognize_char_class(regparse, endp,
+ extra == NFA_ADD_NL);
+ if (result != FAIL)
+ {
+ if (result >= NFA_FIRST_NL && result <= NFA_LAST_NL)
+ {
+ EMIT(result - NFA_ADD_NL);
+ EMIT(NFA_NEWL);
+ EMIT(NFA_OR);
+ }
+ else
+ EMIT(result);
+ regparse = endp;
+ MB_PTR_ADV(regparse);
+ return OK;
+ }
+ /*
+ * Failed to recognize a character class. Use the simple
+ * version that turns [abc] into 'a' OR 'b' OR 'c'
+ */
+ startc = -1;
+ negated = FALSE;
+ if (*regparse == '^') // negated range
+ {
+ negated = TRUE;
+ MB_PTR_ADV(regparse);
+ EMIT(NFA_START_NEG_COLL);
+ }
+ else
+ EMIT(NFA_START_COLL);
+ if (*regparse == '-')
+ {
+ startc = '-';
+ EMIT(startc);
+ EMIT(NFA_CONCAT);
+ MB_PTR_ADV(regparse);
+ }
+ // Emit the OR branches for each character in the []
+ emit_range = FALSE;
+ while (regparse < endp)
+ {
+ int oldstartc = startc;
+
+ startc = -1;
+ got_coll_char = FALSE;
+ if (*regparse == '[')
+ {
+ // Check for [: :], [= =], [. .]
+ equiclass = collclass = 0;
+ charclass = get_char_class(&regparse);
+ if (charclass == CLASS_NONE)
+ {
+ equiclass = get_equi_class(&regparse);
+ if (equiclass == 0)
+ collclass = get_coll_element(&regparse);
+ }
+
+ // 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:
+ wants_nfa = TRUE;
+ 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:
+ wants_nfa = TRUE;
+ 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;
+ case CLASS_IDENT:
+ EMIT(NFA_CLASS_IDENT);
+ break;
+ case CLASS_KEYWORD:
+ EMIT(NFA_CLASS_KEYWORD);
+ break;
+ case CLASS_FNAME:
+ EMIT(NFA_CLASS_FNAME);
+ break;
+ }
+ EMIT(NFA_CONCAT);
+ continue;
+ }
+ // Try equivalence class [=a=] and the like
+ if (equiclass != 0)
+ {
+ result = nfa_emit_equi_class(equiclass);
+ if (result == FAIL)
+ {
+ // should never happen
+ EMSG_RET_FAIL(_(e_error_building_nfa_with_equivalence_class));
+ }
+ 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'. Also allows '-' as a
+ // start character.
+ if (*regparse == '-' && oldstartc != -1)
+ {
+ emit_range = TRUE;
+ startc = oldstartc;
+ MB_PTR_ADV(regparse);
+ 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 == '\\'
+ && !reg_cpo_bsl
+ && regparse + 1 <= endp
+ && (vim_strchr(REGEXP_INRANGE, regparse[1]) != NULL
+ || (!reg_cpo_lit
+ && vim_strchr(REGEXP_ABBR, regparse[1])
+ != NULL)
+ )
+ )
+ {
+ MB_PTR_ADV(regparse);
+
+ if (*regparse == 'n')
+ startc = (reg_string || emit_range
+ || regparse[1] == '-') ? 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;
+ MB_PTR_BACK(old_regparse, regparse);
+ }
+ else
+ {
+ // \r,\t,\e,\b
+ startc = backslash_trans(*regparse);
+ }
+ }
+
+ // Normal printable char
+ if (startc == -1)
+ startc = PTR2CHAR(regparse);
+
+ // Previous char was '-', so this char is end of range.
+ if (emit_range)
+ {
+ int endc = startc;
+
+ startc = oldstartc;
+ if (startc > endc)
+ EMSG_RET_FAIL(_(e_reverse_range_in_character_class));
+
+ if (endc > startc + 2)
+ {
+ // Emit a range instead of the sequence of
+ // individual characters.
+ if (startc == 0)
+ // \x00 is translated to \x0a, start at \x01.
+ EMIT(1);
+ else
+ --post_ptr; // remove NFA_CONCAT
+ EMIT(endc);
+ EMIT(NFA_RANGE);
+ EMIT(NFA_CONCAT);
+ }
+ else if (has_mbyte && ((*mb_char2len)(startc) > 1
+ || (*mb_char2len)(endc) > 1))
+ {
+ // Emit the characters in the range.
+ // "startc" was already emitted, so skip it.
+ //
+ for (c = startc + 1; c <= endc; c++)
+ {
+ EMIT(c);
+ EMIT(NFA_CONCAT);
+ }
+ }
+ else
+ {
+ // Emit the range. "startc" was already emitted, so
+ // skip it.
+ for (c = startc + 1; c <= endc; c++)
+ {
+ EMIT(c);
+ EMIT(NFA_CONCAT);
+ }
+ }
+ emit_range = FALSE;
+ startc = -1;
+ }
+ 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 (startc == NFA_NEWL)
+ {
+ // Line break can't be matched as part of the
+ // collection, add an OR below. But not for negated
+ // range.
+ if (!negated)
+ extra = NFA_ADD_NL;
+ }
+ else
+ {
+ if (got_coll_char == TRUE && startc == 0)
+ EMIT(0x0a);
+ else
+ EMIT(startc);
+ EMIT(NFA_CONCAT);
+ }
+ }
+
+ MB_PTR_ADV(regparse);
+ } // while (p < endp)
+
+ MB_PTR_BACK(old_regparse, regparse);
+ if (*regparse == '-') // if last, '-' is just a char
+ {
+ EMIT('-');
+ EMIT(NFA_CONCAT);
+ }
+
+ // skip the trailing ]
+ regparse = endp;
+ MB_PTR_ADV(regparse);
+
+ // Mark end of the collection.
+ if (negated == TRUE)
+ EMIT(NFA_END_NEG_COLL);
+ else
+ EMIT(NFA_END_COLL);
+
+ // \_[] also matches \n but it's not negated
+ if (extra == NFA_ADD_NL)
+ {
+ EMIT(reg_string ? NL : NFA_NEWL);
+ EMIT(NFA_OR);
+ }
+
+ return OK;
+ } // if exists closing ]
+
+ if (reg_strict)
+ EMSG_RET_FAIL(_(e_missing_rsb_after_str_lsb));
+ // FALLTHROUGH
+
+ default:
+ {
+ int plen;
+
+nfa_do_multibyte:
+ // plen is length of current char with composing chars
+ if (enc_utf8 && ((*mb_char2len)(c)
+ != (plen = utfc_ptr2len(old_regparse))
+ || utf_iscomposing(c)))
+ {
+ int i = 0;
+
+ // A base character plus composing characters, or just one
+ // or more composing characters.
+ // This requires creating a separate atom as if enclosing
+ // the characters in (), where NFA_COMPOSING is the ( and
+ // NFA_END_COMPOSING is the ). 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 'b' and 'c' are chars with codes > 256.
+ for (;;)
+ {
+ EMIT(c);
+ if (i > 0)
+ EMIT(NFA_CONCAT);
+ if ((i += utf_char2len(c)) >= plen)
+ break;
+ c = utf_ptr2char(old_regparse + i);
+ }
+ EMIT(NFA_COMPOSING);
+ regparse = old_regparse + plen;
+ }
+ else
+ {
+ c = no_Magic(c);
+ EMIT(c);
+ }
+ return OK;
+ }
+ }
+
+ 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(void)
+{
+ int i;
+ int op;
+ int ret;
+ long minval, maxval;
+ int greedy = TRUE; // Braces are prefixed with '-' ?
+ parse_state_T old_state;
+ parse_state_T new_state;
+ long c2;
+ int old_post_pos;
+ int my_post_start;
+ int quest;
+
+ // Save the current parse state, so that we can use it if <atom>{m,n} is
+ // next.
+ save_parse_state(&old_state);
+
+ // store current pos in the postfix form, for \{m,n} involving 0s
+ my_post_start = (int)(post_ptr - post_start);
+
+ 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 be the empty string.
+ *
+ * In order to be consistent with the old engine, we replace
+ * <atom>+ with <atom><atom>*
+ */
+ restore_parse_state(&old_state);
+ curchr = -1;
+ if (nfa_regatom() == FAIL)
+ return FAIL;
+ EMIT(NFA_STAR);
+ EMIT(NFA_CONCAT);
+ skipchr(); // skip the \+
+ break;
+
+ case Magic('@'):
+ c2 = getdecchrs();
+ op = no_Magic(getchr());
+ i = 0;
+ switch(op)
+ {
+ case '=':
+ // \@=
+ i = NFA_PREV_ATOM_NO_WIDTH;
+ break;
+ case '!':
+ // \@!
+ i = NFA_PREV_ATOM_NO_WIDTH_NEG;
+ break;
+ case '<':
+ op = no_Magic(getchr());
+ if (op == '=')
+ // \@<=
+ i = NFA_PREV_ATOM_JUST_BEFORE;
+ else if (op == '!')
+ // \@<!
+ i = NFA_PREV_ATOM_JUST_BEFORE_NEG;
+ break;
+ case '>':
+ // \@>
+ i = NFA_PREV_ATOM_LIKE_PATTERN;
+ break;
+ }
+ if (i == 0)
+ {
+ semsg(_(e_nfa_regexp_unknown_operator_at_chr), op);
+ return FAIL;
+ }
+ EMIT(i);
+ if (i == NFA_PREV_ATOM_JUST_BEFORE
+ || i == NFA_PREV_ATOM_JUST_BEFORE_NEG)
+ EMIT(c2);
+ 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))
+ EMSG_RET_FAIL(_(e_nfa_regexp_error_reading_repetition_limits));
+
+ // <atom>{0,inf}, <atom>{0,} and <atom>{} are equivalent to
+ // <atom>*
+ if (minval == 0 && maxval == MAX_LIMIT)
+ {
+ if (greedy) // { { (match the braces)
+ // \{}, \{0,}
+ EMIT(NFA_STAR);
+ else // { { (match the braces)
+ // \{-}, \{-0,}
+ EMIT(NFA_STAR_NONGREEDY);
+ break;
+ }
+
+ // Special case: x{0} or x{-0}
+ if (maxval == 0)
+ {
+ // Ignore result of previous call to nfa_regatom()
+ post_ptr = post_start + my_post_start;
+ // NFA_EMPTY is 0-length and works everywhere
+ EMIT(NFA_EMPTY);
+ return OK;
+ }
+
+ // The engine is very inefficient (uses too many states) when the
+ // maximum is much larger than the minimum and when the maximum is
+ // large. However, when maxval is MAX_LIMIT, it is okay, as this
+ // will emit NFA_STAR.
+ // Bail out if we can use the other engine, but only, when the
+ // pattern does not need the NFA engine like (e.g. [[:upper:]]\{2,\}
+ // does not work with characters > 8 bit with the BT engine)
+ if ((nfa_re_flags & RE_AUTO)
+ && (maxval > 500 || maxval > minval + 200)
+ && (maxval != MAX_LIMIT && minval < 200)
+ && !wants_nfa)
+ return FAIL;
+
+ // Ignore previous call to nfa_regatom()
+ post_ptr = post_start + my_post_start;
+ // Save parse state after the repeated atom and the \{}
+ save_parse_state(&new_state);
+
+ quest = (greedy == TRUE? NFA_QUEST : NFA_QUEST_NONGREEDY);
+ for (i = 0; i < maxval; i++)
+ {
+ // Goto beginning of the repeated atom
+ restore_parse_state(&old_state);
+ old_post_pos = (int)(post_ptr - post_start);
+ if (nfa_regatom() == FAIL)
+ return FAIL;
+ // after "minval" times, atoms are optional
+ if (i + 1 > minval)
+ {
+ if (maxval == MAX_LIMIT)
+ {
+ if (greedy)
+ EMIT(NFA_STAR);
+ else
+ EMIT(NFA_STAR_NONGREEDY);
+ }
+ else
+ EMIT(quest);
+ }
+ if (old_post_pos != my_post_start)
+ EMIT(NFA_CONCAT);
+ if (i + 1 > minval && maxval == MAX_LIMIT)
+ break;
+ }
+
+ // Go to just after the repeated atom and the \{}
+ restore_parse_state(&new_state);
+ curchr = -1;
+
+ break;
+
+
+ default:
+ break;
+ } // end switch
+
+ if (re_multi_type(peekchr()) != NOT_MULTI)
+ // Can't have a multi follow a multi.
+ EMSG_RET_FAIL(_(e_nfa_regexp_cant_have_multi_follow_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(void)
+{
+ int cont = TRUE;
+ int first = TRUE;
+
+ while (cont)
+ {
+ switch (peekchr())
+ {
+ case NUL:
+ case Magic('|'):
+ case Magic('&'):
+ case Magic(')'):
+ cont = FALSE;
+ break;
+
+ case Magic('Z'):
+ regflags |= RF_ICOMBINE;
+ 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(void)
+{
+ int old_post_pos;
+
+ old_post_pos = (int)(post_ptr - post_start);
+
+ // First branch, possibly the only one
+ if (nfa_regconcat() == FAIL)
+ return FAIL;
+
+ // Try next concats
+ while (peekchr() == Magic('&'))
+ {
+ skipchr();
+ // if concat is empty do emit a node
+ if (old_post_pos == (int)(post_ptr - post_start))
+ EMIT(NFA_EMPTY);
+ EMIT(NFA_NOPEN);
+ EMIT(NFA_PREV_ATOM_NO_WIDTH);
+ old_post_pos = (int)(post_ptr - post_start);
+ if (nfa_regconcat() == FAIL)
+ return FAIL;
+ // if concat is empty do emit a node
+ if (old_post_pos == (int)(post_ptr - post_start))
+ EMIT(NFA_EMPTY);
+ EMIT(NFA_CONCAT);
+ }
+
+ // if a branch is empty, emit one node for it
+ if (old_post_pos == (int)(post_ptr - post_start))
+ EMIT(NFA_EMPTY);
+
+ 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(
+ int paren) // REG_NOPAREN, REG_PAREN, REG_NPAREN or REG_ZPAREN
+{
+ int parno = 0;
+
+ if (paren == REG_PAREN)
+ {
+ if (regnpar >= NSUBEXP) // Too many `('
+ EMSG_RET_FAIL(_(e_nfa_regexp_too_many_parens));
+ parno = regnpar++;
+ }
+#ifdef FEAT_SYN_HL
+ else if (paren == REG_ZPAREN)
+ {
+ // Make a ZOPEN node.
+ if (regnzpar >= NSUBEXP)
+ EMSG_RET_FAIL(_(e_nfa_regexp_too_many_z));
+ parno = regnzpar++;
+ }
+#endif
+
+ 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(')'))
+ {
+ if (paren == REG_NPAREN)
+ EMSG2_RET_FAIL(_(e_unmatched_str_percent_open),
+ reg_magic == MAGIC_ALL);
+ else
+ EMSG2_RET_FAIL(_(e_unmatched_str_open), reg_magic == MAGIC_ALL);
+ }
+ else if (paren == REG_NOPAREN && peekchr() != NUL)
+ {
+ if (peekchr() == Magic(')'))
+ EMSG2_RET_FAIL(_(e_unmatched_str_close), reg_magic == MAGIC_ALL);
+ else
+ EMSG_RET_FAIL(_(e_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);
+ }
+#ifdef FEAT_SYN_HL
+ else if (paren == REG_ZPAREN)
+ EMIT(NFA_ZOPEN + parno);
+#endif
+
+ return OK;
+}
+
+#ifdef DEBUG
+static char_u code[50];
+
+ static void
+nfa_set_code(int c)
+{
+ int addnl = FALSE;
+
+ if (c >= NFA_FIRST_NL && c <= NFA_LAST_NL)
+ {
+ addnl = TRUE;
+ c -= NFA_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_BACKREF1: STRCPY(code, "NFA_BACKREF1"); break;
+ case NFA_BACKREF2: STRCPY(code, "NFA_BACKREF2"); break;
+ case NFA_BACKREF3: STRCPY(code, "NFA_BACKREF3"); break;
+ case NFA_BACKREF4: STRCPY(code, "NFA_BACKREF4"); break;
+ case NFA_BACKREF5: STRCPY(code, "NFA_BACKREF5"); break;
+ case NFA_BACKREF6: STRCPY(code, "NFA_BACKREF6"); break;
+ case NFA_BACKREF7: STRCPY(code, "NFA_BACKREF7"); break;
+ case NFA_BACKREF8: STRCPY(code, "NFA_BACKREF8"); break;
+ case NFA_BACKREF9: STRCPY(code, "NFA_BACKREF9"); break;
+#ifdef FEAT_SYN_HL
+ case NFA_ZREF1: STRCPY(code, "NFA_ZREF1"); break;
+ case NFA_ZREF2: STRCPY(code, "NFA_ZREF2"); break;
+ case NFA_ZREF3: STRCPY(code, "NFA_ZREF3"); break;
+ case NFA_ZREF4: STRCPY(code, "NFA_ZREF4"); break;
+ case NFA_ZREF5: STRCPY(code, "NFA_ZREF5"); break;
+ case NFA_ZREF6: STRCPY(code, "NFA_ZREF6"); break;
+ case NFA_ZREF7: STRCPY(code, "NFA_ZREF7"); break;
+ case NFA_ZREF8: STRCPY(code, "NFA_ZREF8"); break;
+ case NFA_ZREF9: STRCPY(code, "NFA_ZREF9"); break;
+#endif
+ case NFA_SKIP: STRCPY(code, "NFA_SKIP"); break;
+
+ case NFA_PREV_ATOM_NO_WIDTH:
+ STRCPY(code, "NFA_PREV_ATOM_NO_WIDTH"); break;
+ case NFA_PREV_ATOM_NO_WIDTH_NEG:
+ STRCPY(code, "NFA_PREV_ATOM_NO_WIDTH_NEG"); break;
+ case NFA_PREV_ATOM_JUST_BEFORE:
+ STRCPY(code, "NFA_PREV_ATOM_JUST_BEFORE"); break;
+ case NFA_PREV_ATOM_JUST_BEFORE_NEG:
+ STRCPY(code, "NFA_PREV_ATOM_JUST_BEFORE_NEG"); break;
+ case NFA_PREV_ATOM_LIKE_PATTERN:
+ STRCPY(code, "NFA_PREV_ATOM_LIKE_PATTERN"); break;
+
+ case NFA_NOPEN: STRCPY(code, "NFA_NOPEN"); break;
+ case NFA_NCLOSE: STRCPY(code, "NFA_NCLOSE"); break;
+ case NFA_START_INVISIBLE: STRCPY(code, "NFA_START_INVISIBLE"); break;
+ case NFA_START_INVISIBLE_FIRST:
+ STRCPY(code, "NFA_START_INVISIBLE_FIRST"); break;
+ case NFA_START_INVISIBLE_NEG:
+ STRCPY(code, "NFA_START_INVISIBLE_NEG"); break;
+ case NFA_START_INVISIBLE_NEG_FIRST:
+ STRCPY(code, "NFA_START_INVISIBLE_NEG_FIRST"); break;
+ case NFA_START_INVISIBLE_BEFORE:
+ STRCPY(code, "NFA_START_INVISIBLE_BEFORE"); break;
+ case NFA_START_INVISIBLE_BEFORE_FIRST:
+ STRCPY(code, "NFA_START_INVISIBLE_BEFORE_FIRST"); break;
+ case NFA_START_INVISIBLE_BEFORE_NEG:
+ STRCPY(code, "NFA_START_INVISIBLE_BEFORE_NEG"); break;
+ case NFA_START_INVISIBLE_BEFORE_NEG_FIRST:
+ STRCPY(code, "NFA_START_INVISIBLE_BEFORE_NEG_FIRST"); break;
+ case NFA_START_PATTERN: STRCPY(code, "NFA_START_PATTERN"); break;
+ case NFA_END_INVISIBLE: STRCPY(code, "NFA_END_INVISIBLE"); break;
+ case NFA_END_INVISIBLE_NEG: STRCPY(code, "NFA_END_INVISIBLE_NEG"); break;
+ case NFA_END_PATTERN: STRCPY(code, "NFA_END_PATTERN"); break;
+
+ case NFA_COMPOSING: STRCPY(code, "NFA_COMPOSING"); break;
+ case NFA_END_COMPOSING: STRCPY(code, "NFA_END_COMPOSING"); break;
+ case NFA_OPT_CHARS: STRCPY(code, "NFA_OPT_CHARS"); break;
+
+ case NFA_MOPEN:
+ case NFA_MOPEN1:
+ case NFA_MOPEN2:
+ case NFA_MOPEN3:
+ case NFA_MOPEN4:
+ case NFA_MOPEN5:
+ case NFA_MOPEN6:
+ case NFA_MOPEN7:
+ case NFA_MOPEN8:
+ case NFA_MOPEN9:
+ STRCPY(code, "NFA_MOPEN(x)");
+ code[10] = c - NFA_MOPEN + '0';
+ break;
+ case NFA_MCLOSE:
+ case NFA_MCLOSE1:
+ case NFA_MCLOSE2:
+ case NFA_MCLOSE3:
+ case NFA_MCLOSE4:
+ case NFA_MCLOSE5:
+ case NFA_MCLOSE6:
+ case NFA_MCLOSE7:
+ case NFA_MCLOSE8:
+ case NFA_MCLOSE9:
+ STRCPY(code, "NFA_MCLOSE(x)");
+ code[11] = c - NFA_MCLOSE + '0';
+ break;
+#ifdef FEAT_SYN_HL
+ case NFA_ZOPEN:
+ case NFA_ZOPEN1:
+ case NFA_ZOPEN2:
+ case NFA_ZOPEN3:
+ case NFA_ZOPEN4:
+ case NFA_ZOPEN5:
+ case NFA_ZOPEN6:
+ case NFA_ZOPEN7:
+ case NFA_ZOPEN8:
+ case NFA_ZOPEN9:
+ STRCPY(code, "NFA_ZOPEN(x)");
+ code[10] = c - NFA_ZOPEN + '0';
+ break;
+ case NFA_ZCLOSE:
+ case NFA_ZCLOSE1:
+ case NFA_ZCLOSE2:
+ case NFA_ZCLOSE3:
+ case NFA_ZCLOSE4:
+ case NFA_ZCLOSE5:
+ case NFA_ZCLOSE6:
+ case NFA_ZCLOSE7:
+ case NFA_ZCLOSE8:
+ case NFA_ZCLOSE9:
+ STRCPY(code, "NFA_ZCLOSE(x)");
+ code[11] = c - NFA_ZCLOSE + '0';
+ break;
+#endif
+ 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_EOF: STRCPY(code, "NFA_EOF "); break;
+ case NFA_BOF: STRCPY(code, "NFA_BOF "); break;
+ case NFA_LNUM: STRCPY(code, "NFA_LNUM "); break;
+ case NFA_LNUM_GT: STRCPY(code, "NFA_LNUM_GT "); break;
+ case NFA_LNUM_LT: STRCPY(code, "NFA_LNUM_LT "); break;
+ case NFA_COL: STRCPY(code, "NFA_COL "); break;
+ case NFA_COL_GT: STRCPY(code, "NFA_COL_GT "); break;
+ case NFA_COL_LT: STRCPY(code, "NFA_COL_LT "); break;
+ case NFA_VCOL: STRCPY(code, "NFA_VCOL "); break;
+ case NFA_VCOL_GT: STRCPY(code, "NFA_VCOL_GT "); break;
+ case NFA_VCOL_LT: STRCPY(code, "NFA_VCOL_LT "); break;
+ case NFA_MARK: STRCPY(code, "NFA_MARK "); break;
+ case NFA_MARK_GT: STRCPY(code, "NFA_MARK_GT "); break;
+ case NFA_MARK_LT: STRCPY(code, "NFA_MARK_LT "); break;
+ case NFA_CURSOR: STRCPY(code, "NFA_CURSOR "); break;
+ case NFA_VISUAL: STRCPY(code, "NFA_VISUAL "); break;
+ case NFA_ANY_COMPOSING: STRCPY(code, "NFA_ANY_COMPOSING "); break;
+
+ case NFA_STAR: STRCPY(code, "NFA_STAR "); break;
+ case NFA_STAR_NONGREEDY: STRCPY(code, "NFA_STAR_NONGREEDY "); break;
+ case NFA_QUEST: STRCPY(code, "NFA_QUEST"); break;
+ case NFA_QUEST_NONGREEDY: STRCPY(code, "NFA_QUEST_NON_GREEDY"); break;
+ case NFA_EMPTY: STRCPY(code, "NFA_EMPTY"); break;
+ case NFA_OR: STRCPY(code, "NFA_OR"); break;
+
+ case NFA_START_COLL: STRCPY(code, "NFA_START_COLL"); break;
+ case NFA_END_COLL: STRCPY(code, "NFA_END_COLL"); break;
+ case NFA_START_NEG_COLL: STRCPY(code, "NFA_START_NEG_COLL"); break;
+ case NFA_END_NEG_COLL: STRCPY(code, "NFA_END_NEG_COLL"); break;
+ case NFA_RANGE: STRCPY(code, "NFA_RANGE"); break;
+ case NFA_RANGE_MIN: STRCPY(code, "NFA_RANGE_MIN"); break;
+ case NFA_RANGE_MAX: STRCPY(code, "NFA_RANGE_MAX"); 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_CLASS_IDENT: STRCPY(code, "NFA_CLASS_IDENT"); break;
+ case NFA_CLASS_KEYWORD: STRCPY(code, "NFA_CLASS_KEYWORD"); break;
+ case NFA_CLASS_FNAME: STRCPY(code, "NFA_CLASS_FNAME"); 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;
+ case NFA_LOWER_IC: STRCPY(code, "NFA_LOWER_IC"); break;
+ case NFA_NLOWER_IC: STRCPY(code, "NFA_NLOWER_IC"); break;
+ case NFA_UPPER_IC: STRCPY(code, "NFA_UPPER_IC"); break;
+ case NFA_NUPPER_IC: STRCPY(code, "NFA_NUPPER_IC"); break;
+
+ default:
+ STRCPY(code, "CHAR(x)");
+ code[5] = c;
+ }
+
+ if (addnl == TRUE)
+ STRCAT(code, " + NEWLINE ");
+
+}
+
+#ifdef ENABLE_LOG
+static FILE *log_fd;
+static char_u e_log_open_failed[] = N_("Could not open temporary log file for writing, displaying on stderr... ");
+
+/*
+ * Print the postfix notation of the current regexp.
+ */
+ static void
+nfa_postfix_dump(char_u *expr, int retval)
+{
+ int *p;
+ FILE *f;
+
+ f = fopen(NFA_REGEXP_DUMP_LOG, "a");
+ if (f == NULL)
+ return;
+
+ 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 < post_ptr; p++)
+ {
+ nfa_set_code(*p);
+ fprintf(f, "%s, ", code);
+ }
+ fprintf(f, "\"\nPostfix notation (int): ");
+ for (p = post_start; *p && p < post_ptr; 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(FILE *debugf, nfa_state_T *state)
+{
+ garray_T indent;
+
+ ga_init2(&indent, 1, 64);
+ ga_append(&indent, '\0');
+ nfa_print_state2(debugf, state, &indent);
+ ga_clear(&indent);
+}
+
+ static void
+nfa_print_state2(FILE *debugf, nfa_state_T *state, garray_T *indent)
+{
+ char_u *p;
+
+ if (state == NULL)
+ return;
+
+ fprintf(debugf, "(%2d)", abs(state->id));
+
+ // Output indent
+ p = (char_u *)indent->ga_data;
+ if (indent->ga_len >= 3)
+ {
+ int last = indent->ga_len - 3;
+ char_u save[2];
+
+ STRNCPY(save, &p[last], 2);
+ memcpy(&p[last], "+-", 2);
+ fprintf(debugf, " %s", p);
+ STRNCPY(&p[last], save, 2);
+ }
+ else
+ fprintf(debugf, " %s", p);
+
+ nfa_set_code(state->c);
+ fprintf(debugf, "%s (%d) (id=%d) val=%d\n",
+ code,
+ state->c,
+ abs(state->id),
+ state->val);
+ if (state->id < 0)
+ return;
+
+ state->id = abs(state->id) * -1;
+
+ // grow indent for state->out
+ indent->ga_len -= 1;
+ if (state->out1)
+ ga_concat(indent, (char_u *)"| ");
+ else
+ ga_concat(indent, (char_u *)" ");
+ ga_append(indent, NUL);
+
+ nfa_print_state2(debugf, state->out, indent);
+
+ // replace last part of indent for state->out1
+ indent->ga_len -= 3;
+ ga_concat(indent, (char_u *)" ");
+ ga_append(indent, NUL);
+
+ nfa_print_state2(debugf, state->out1, indent);
+
+ // shrink indent
+ indent->ga_len -= 3;
+ ga_append(indent, NUL);
+}
+
+/*
+ * Print the NFA state machine.
+ */
+ static void
+nfa_dump(nfa_regprog_T *prog)
+{
+ FILE *debugf = fopen(NFA_REGEXP_DUMP_LOG, "a");
+
+ if (debugf == NULL)
+ return;
+
+ nfa_print_state(debugf, prog->start);
+
+ if (prog->reganch)
+ fprintf(debugf, "reganch: %d\n", prog->reganch);
+ if (prog->regstart != NUL)
+ fprintf(debugf, "regstart: %c (decimal: %d)\n",
+ prog->regstart, prog->regstart);
+ if (prog->match_text != NULL)
+ fprintf(debugf, "match_text: \"%s\"\n", prog->match_text);
+
+ 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(void)
+{
+ 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 *
+alloc_state(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->val = 0;
+
+ s->id = istate;
+ s->lastlist[0] = 0;
+ s->lastlist[1] = 0;
+
+ 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.
+ */
+
+// Since the out pointers in the list are always
+// uninitialized, we use the pointers themselves
+// as storage for the Ptrlists.
+typedef union Ptrlist Ptrlist;
+union Ptrlist
+{
+ Ptrlist *next;
+ nfa_state_T *s;
+};
+
+struct Frag
+{
+ nfa_state_T *start;
+ Ptrlist *out;
+};
+typedef struct Frag Frag_T;
+
+/*
+ * Initialize a Frag_T struct and return it.
+ */
+ static Frag_T
+frag(nfa_state_T *start, Ptrlist *out)
+{
+ Frag_T n;
+
+ n.start = start;
+ n.out = out;
+ return n;
+}
+
+/*
+ * Create singleton list containing just outp.
+ */
+ static Ptrlist *
+list1(
+ 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(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(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(int *postfix UNUSED, int *end UNUSED, int *p UNUSED)
+{
+#ifdef NFA_REGEXP_ERROR_LOG
+ FILE *df;
+ int *p2;
+
+ df = fopen(NFA_REGEXP_ERROR_LOG, "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);
+ }
+#endif
+ emsg(_(e_nfa_regexp_could_not_pop_stack));
+}
+
+/*
+ * Push an item onto the stack.
+ */
+ static void
+st_push(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(Frag_T **p, Frag_T *stack)
+{
+ Frag_T *stackp;
+
+ *p = *p - 1;
+ stackp = *p;
+ if (stackp < stack)
+ return empty;
+ return **p;
+}
+
+/*
+ * Estimate the maximum byte length of anything matching "state".
+ * When unknown or unlimited return -1.
+ */
+ static int
+nfa_max_width(nfa_state_T *startstate, int depth)
+{
+ int l, r;
+ nfa_state_T *state = startstate;
+ int len = 0;
+
+ // detect looping in a NFA_SPLIT
+ if (depth > 4)
+ return -1;
+
+ while (state != NULL)
+ {
+ switch (state->c)
+ {
+ case NFA_END_INVISIBLE:
+ case NFA_END_INVISIBLE_NEG:
+ // the end, return what we have
+ return len;
+
+ case NFA_SPLIT:
+ // two alternatives, use the maximum
+ l = nfa_max_width(state->out, depth + 1);
+ r = nfa_max_width(state->out1, depth + 1);
+ if (l < 0 || r < 0)
+ return -1;
+ return len + (l > r ? l : r);
+
+ case NFA_ANY:
+ case NFA_START_COLL:
+ case NFA_START_NEG_COLL:
+ // matches some character, including composing chars
+ if (enc_utf8)
+ len += MB_MAXBYTES;
+ else if (has_mbyte)
+ len += 2;
+ else
+ ++len;
+ if (state->c != NFA_ANY)
+ {
+ // skip over the characters
+ state = state->out1->out;
+ continue;
+ }
+ break;
+
+ case NFA_DIGIT:
+ case NFA_WHITE:
+ case NFA_HEX:
+ case NFA_OCTAL:
+ // ascii
+ ++len;
+ break;
+
+ case NFA_IDENT:
+ case NFA_SIDENT:
+ case NFA_KWORD:
+ case NFA_SKWORD:
+ case NFA_FNAME:
+ case NFA_SFNAME:
+ case NFA_PRINT:
+ case NFA_SPRINT:
+ case NFA_NWHITE:
+ case NFA_NDIGIT:
+ case NFA_NHEX:
+ case NFA_NOCTAL:
+ case NFA_WORD:
+ case NFA_NWORD:
+ case NFA_HEAD:
+ case NFA_NHEAD:
+ case NFA_ALPHA:
+ case NFA_NALPHA:
+ case NFA_LOWER:
+ case NFA_NLOWER:
+ case NFA_UPPER:
+ case NFA_NUPPER:
+ case NFA_LOWER_IC:
+ case NFA_NLOWER_IC:
+ case NFA_UPPER_IC:
+ case NFA_NUPPER_IC:
+ case NFA_ANY_COMPOSING:
+ // possibly non-ascii
+ if (has_mbyte)
+ len += 3;
+ else
+ ++len;
+ break;
+
+ case NFA_START_INVISIBLE:
+ case NFA_START_INVISIBLE_NEG:
+ case NFA_START_INVISIBLE_BEFORE:
+ case NFA_START_INVISIBLE_BEFORE_NEG:
+ // zero-width, out1 points to the END state
+ state = state->out1->out;
+ continue;
+
+ case NFA_BACKREF1:
+ case NFA_BACKREF2:
+ case NFA_BACKREF3:
+ case NFA_BACKREF4:
+ case NFA_BACKREF5:
+ case NFA_BACKREF6:
+ case NFA_BACKREF7:
+ case NFA_BACKREF8:
+ case NFA_BACKREF9:
+#ifdef FEAT_SYN_HL
+ case NFA_ZREF1:
+ case NFA_ZREF2:
+ case NFA_ZREF3:
+ case NFA_ZREF4:
+ case NFA_ZREF5:
+ case NFA_ZREF6:
+ case NFA_ZREF7:
+ case NFA_ZREF8:
+ case NFA_ZREF9:
+#endif
+ case NFA_NEWL:
+ case NFA_SKIP:
+ // unknown width
+ return -1;
+
+ case NFA_BOL:
+ case NFA_EOL:
+ case NFA_BOF:
+ case NFA_EOF:
+ case NFA_BOW:
+ case NFA_EOW:
+ case NFA_MOPEN:
+ case NFA_MOPEN1:
+ case NFA_MOPEN2:
+ case NFA_MOPEN3:
+ case NFA_MOPEN4:
+ case NFA_MOPEN5:
+ case NFA_MOPEN6:
+ case NFA_MOPEN7:
+ case NFA_MOPEN8:
+ case NFA_MOPEN9:
+#ifdef FEAT_SYN_HL
+ case NFA_ZOPEN:
+ case NFA_ZOPEN1:
+ case NFA_ZOPEN2:
+ case NFA_ZOPEN3:
+ case NFA_ZOPEN4:
+ case NFA_ZOPEN5:
+ case NFA_ZOPEN6:
+ case NFA_ZOPEN7:
+ case NFA_ZOPEN8:
+ case NFA_ZOPEN9:
+ case NFA_ZCLOSE:
+ case NFA_ZCLOSE1:
+ case NFA_ZCLOSE2:
+ case NFA_ZCLOSE3:
+ case NFA_ZCLOSE4:
+ case NFA_ZCLOSE5:
+ case NFA_ZCLOSE6:
+ case NFA_ZCLOSE7:
+ case NFA_ZCLOSE8:
+ case NFA_ZCLOSE9:
+#endif
+ case NFA_MCLOSE:
+ case NFA_MCLOSE1:
+ case NFA_MCLOSE2:
+ case NFA_MCLOSE3:
+ case NFA_MCLOSE4:
+ case NFA_MCLOSE5:
+ case NFA_MCLOSE6:
+ case NFA_MCLOSE7:
+ case NFA_MCLOSE8:
+ case NFA_MCLOSE9:
+ case NFA_NOPEN:
+ case NFA_NCLOSE:
+
+ case NFA_LNUM_GT:
+ case NFA_LNUM_LT:
+ case NFA_COL_GT:
+ case NFA_COL_LT:
+ case NFA_VCOL_GT:
+ case NFA_VCOL_LT:
+ case NFA_MARK_GT:
+ case NFA_MARK_LT:
+ case NFA_VISUAL:
+ case NFA_LNUM:
+ case NFA_CURSOR:
+ case NFA_COL:
+ case NFA_VCOL:
+ case NFA_MARK:
+
+ case NFA_ZSTART:
+ case NFA_ZEND:
+ case NFA_OPT_CHARS:
+ case NFA_EMPTY:
+ case NFA_START_PATTERN:
+ case NFA_END_PATTERN:
+ case NFA_COMPOSING:
+ case NFA_END_COMPOSING:
+ // zero-width
+ break;
+
+ default:
+ if (state->c < 0)
+ // don't know what this is
+ return -1;
+ // normal character
+ len += MB_CHAR2LEN(state->c);
+ break;
+ }
+
+ // normal way to continue
+ state = state->out;
+ }
+
+ // unrecognized, "cannot happen"
+ return -1;
+}
+
+/*
+ * Convert a postfix form into its equivalent NFA.
+ * Return the NFA start state on success, NULL otherwise.
+ */
+ static nfa_state_T *
+post2nfa(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;
+ nfa_state_T *ret = NULL;
+
+ 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); \
+ vim_free(stack); \
+ return NULL; \
+ }
+
+ if (nfa_calc_size == FALSE)
+ {
+ // Allocate space for the stack. Max states on the stack: "nstate".
+ stack = ALLOC_MULT(Frag_T, nstate + 1);
+ if (stack == NULL)
+ return NULL;
+ stackp = stack;
+ stack_end = stack + (nstate + 1);
+ }
+
+ for (p = postfix; p < end; ++p)
+ {
+ switch (*p)
+ {
+ case NFA_CONCAT:
+ // Concatenation.
+ // 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().
+ 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_OR:
+ // Alternation
+ if (nfa_calc_size == TRUE)
+ {
+ nstate++;
+ break;
+ }
+ e2 = POP();
+ e1 = POP();
+ s = alloc_state(NFA_SPLIT, e1.start, e2.start);
+ if (s == NULL)
+ goto theend;
+ PUSH(frag(s, append(e1.out, e2.out)));
+ break;
+
+ case NFA_STAR:
+ // Zero or more, prefer more
+ if (nfa_calc_size == TRUE)
+ {
+ nstate++;
+ break;
+ }
+ e = POP();
+ s = alloc_state(NFA_SPLIT, e.start, NULL);
+ if (s == NULL)
+ goto theend;
+ patch(e.out, s);
+ PUSH(frag(s, list1(&s->out1)));
+ break;
+
+ case NFA_STAR_NONGREEDY:
+ // Zero or more, prefer zero
+ if (nfa_calc_size == TRUE)
+ {
+ nstate++;
+ break;
+ }
+ e = POP();
+ s = alloc_state(NFA_SPLIT, NULL, e.start);
+ if (s == NULL)
+ goto theend;
+ patch(e.out, s);
+ PUSH(frag(s, list1(&s->out)));
+ break;
+
+ case NFA_QUEST:
+ // one or zero atoms=> greedy match
+ if (nfa_calc_size == TRUE)
+ {
+ nstate++;
+ break;
+ }
+ e = POP();
+ s = alloc_state(NFA_SPLIT, e.start, NULL);
+ if (s == NULL)
+ goto theend;
+ 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 = alloc_state(NFA_SPLIT, NULL, e.start);
+ if (s == NULL)
+ goto theend;
+ PUSH(frag(s, append(e.out, list1(&s->out))));
+ break;
+
+ case NFA_END_COLL:
+ case NFA_END_NEG_COLL:
+ // On the stack is the sequence starting with NFA_START_COLL or
+ // NFA_START_NEG_COLL and all possible characters. Patch it to
+ // add the output to the start.
+ if (nfa_calc_size == TRUE)
+ {
+ nstate++;
+ break;
+ }
+ e = POP();
+ s = alloc_state(NFA_END_COLL, NULL, NULL);
+ if (s == NULL)
+ goto theend;
+ patch(e.out, s);
+ e.start->out1 = s;
+ PUSH(frag(e.start, list1(&s->out)));
+ break;
+
+ case NFA_RANGE:
+ // Before this are two characters, the low and high end of a
+ // range. Turn them into two states with MIN and MAX.
+ if (nfa_calc_size == TRUE)
+ {
+ // nstate += 0;
+ break;
+ }
+ e2 = POP();
+ e1 = POP();
+ e2.start->val = e2.start->c;
+ e2.start->c = NFA_RANGE_MAX;
+ e1.start->val = e1.start->c;
+ e1.start->c = NFA_RANGE_MIN;
+ patch(e1.out, e2.start);
+ PUSH(frag(e1.start, e2.out));
+ break;
+
+ case NFA_EMPTY:
+ // 0-length, used in a repetition with max/min count of 0
+ if (nfa_calc_size == TRUE)
+ {
+ nstate++;
+ break;
+ }
+ s = alloc_state(NFA_EMPTY, NULL, NULL);
+ if (s == NULL)
+ goto theend;
+ PUSH(frag(s, list1(&s->out)));
+ break;
+
+ case NFA_OPT_CHARS:
+ {
+ int n;
+
+ // \%[abc] implemented as:
+ // NFA_SPLIT
+ // +-CHAR(a)
+ // | +-NFA_SPLIT
+ // | +-CHAR(b)
+ // | | +-NFA_SPLIT
+ // | | +-CHAR(c)
+ // | | | +-next
+ // | | +- next
+ // | +- next
+ // +- next
+ n = *++p; // get number of characters
+ if (nfa_calc_size == TRUE)
+ {
+ nstate += n;
+ break;
+ }
+ s = NULL; // avoid compiler warning
+ e1.out = NULL; // stores list with out1's
+ s1 = NULL; // previous NFA_SPLIT to connect to
+ while (n-- > 0)
+ {
+ e = POP(); // get character
+ s = alloc_state(NFA_SPLIT, e.start, NULL);
+ if (s == NULL)
+ goto theend;
+ if (e1.out == NULL)
+ e1 = e;
+ patch(e.out, s1);
+ append(e1.out, list1(&s->out1));
+ s1 = s;
+ }
+ PUSH(frag(s, e1.out));
+ break;
+ }
+
+ case NFA_PREV_ATOM_NO_WIDTH:
+ case NFA_PREV_ATOM_NO_WIDTH_NEG:
+ case NFA_PREV_ATOM_JUST_BEFORE:
+ case NFA_PREV_ATOM_JUST_BEFORE_NEG:
+ case NFA_PREV_ATOM_LIKE_PATTERN:
+ {
+ int before = (*p == NFA_PREV_ATOM_JUST_BEFORE
+ || *p == NFA_PREV_ATOM_JUST_BEFORE_NEG);
+ int pattern = (*p == NFA_PREV_ATOM_LIKE_PATTERN);
+ int start_state;
+ int end_state;
+ int n = 0;
+ nfa_state_T *zend;
+ nfa_state_T *skip;
+
+ switch (*p)
+ {
+ case NFA_PREV_ATOM_NO_WIDTH:
+ start_state = NFA_START_INVISIBLE;
+ end_state = NFA_END_INVISIBLE;
+ break;
+ case NFA_PREV_ATOM_NO_WIDTH_NEG:
+ start_state = NFA_START_INVISIBLE_NEG;
+ end_state = NFA_END_INVISIBLE_NEG;
+ break;
+ case NFA_PREV_ATOM_JUST_BEFORE:
+ start_state = NFA_START_INVISIBLE_BEFORE;
+ end_state = NFA_END_INVISIBLE;
+ break;
+ case NFA_PREV_ATOM_JUST_BEFORE_NEG:
+ start_state = NFA_START_INVISIBLE_BEFORE_NEG;
+ end_state = NFA_END_INVISIBLE_NEG;
+ break;
+ default: // NFA_PREV_ATOM_LIKE_PATTERN:
+ start_state = NFA_START_PATTERN;
+ end_state = NFA_END_PATTERN;
+ break;
+ }
+
+ if (before)
+ n = *++p; // get the count
+
+ // The \@= operator: match the preceding atom with zero width.
+ // The \@! operator: no match for the preceding atom.
+ // The \@<= operator: match for the preceding atom.
+ // The \@<! operator: no match for the preceding atom.
+ // Surrounds the preceding atom with START_INVISIBLE and
+ // END_INVISIBLE, similarly to MOPEN.
+
+ if (nfa_calc_size == TRUE)
+ {
+ nstate += pattern ? 4 : 2;
+ break;
+ }
+ e = POP();
+ s1 = alloc_state(end_state, NULL, NULL);
+ if (s1 == NULL)
+ goto theend;
+
+ s = alloc_state(start_state, e.start, s1);
+ if (s == NULL)
+ goto theend;
+ if (pattern)
+ {
+ // NFA_ZEND -> NFA_END_PATTERN -> NFA_SKIP -> what follows.
+ skip = alloc_state(NFA_SKIP, NULL, NULL);
+ if (skip == NULL)
+ goto theend;
+ zend = alloc_state(NFA_ZEND, s1, NULL);
+ if (zend == NULL)
+ goto theend;
+ s1->out= skip;
+ patch(e.out, zend);
+ PUSH(frag(s, list1(&skip->out)));
+ }
+ else
+ {
+ patch(e.out, s1);
+ PUSH(frag(s, list1(&s1->out)));
+ if (before)
+ {
+ if (n <= 0)
+ // See if we can guess the maximum width, it avoids a
+ // lot of pointless tries.
+ n = nfa_max_width(e.start, 0);
+ s->val = n; // store the count
+ }
+ }
+ break;
+ }
+
+ case NFA_COMPOSING: // char with composing char
+#if 0
+ // TODO
+ if (regflags & RF_ICOMBINE)
+ {
+ // use the base character only
+ }
+#endif
+ // FALLTHROUGH
+
+ case NFA_MOPEN: // \( \) Submatch
+ case NFA_MOPEN1:
+ case NFA_MOPEN2:
+ case NFA_MOPEN3:
+ case NFA_MOPEN4:
+ case NFA_MOPEN5:
+ case NFA_MOPEN6:
+ case NFA_MOPEN7:
+ case NFA_MOPEN8:
+ case NFA_MOPEN9:
+#ifdef FEAT_SYN_HL
+ case NFA_ZOPEN: // \z( \) Submatch
+ case NFA_ZOPEN1:
+ case NFA_ZOPEN2:
+ case NFA_ZOPEN3:
+ case NFA_ZOPEN4:
+ case NFA_ZOPEN5:
+ case NFA_ZOPEN6:
+ case NFA_ZOPEN7:
+ case NFA_ZOPEN8:
+ case NFA_ZOPEN9:
+#endif
+ case NFA_NOPEN: // \%( \) "Invisible Submatch"
+ if (nfa_calc_size == TRUE)
+ {
+ nstate += 2;
+ break;
+ }
+
+ mopen = *p;
+ switch (*p)
+ {
+ case NFA_NOPEN: mclose = NFA_NCLOSE; break;
+#ifdef FEAT_SYN_HL
+ case NFA_ZOPEN: mclose = NFA_ZCLOSE; break;
+ case NFA_ZOPEN1: mclose = NFA_ZCLOSE1; break;
+ case NFA_ZOPEN2: mclose = NFA_ZCLOSE2; break;
+ case NFA_ZOPEN3: mclose = NFA_ZCLOSE3; break;
+ case NFA_ZOPEN4: mclose = NFA_ZCLOSE4; break;
+ case NFA_ZOPEN5: mclose = NFA_ZCLOSE5; break;
+ case NFA_ZOPEN6: mclose = NFA_ZCLOSE6; break;
+ case NFA_ZOPEN7: mclose = NFA_ZCLOSE7; break;
+ case NFA_ZOPEN8: mclose = NFA_ZCLOSE8; break;
+ case NFA_ZOPEN9: mclose = NFA_ZCLOSE9; break;
+#endif
+ case NFA_COMPOSING: mclose = NFA_END_COMPOSING; break;
+ default:
+ // NFA_MOPEN, NFA_MOPEN1 .. NFA_MOPEN9
+ 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 = alloc_state(mopen, NULL, NULL);
+ if (s == NULL)
+ goto theend;
+ s1 = alloc_state(mclose, NULL, NULL);
+ if (s1 == NULL)
+ goto theend;
+ 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 = alloc_state(mopen, e.start, NULL); // `('
+ if (s == NULL)
+ goto theend;
+
+ s1 = alloc_state(mclose, NULL, NULL); // `)'
+ if (s1 == NULL)
+ goto theend;
+ patch(e.out, s1);
+
+ if (mopen == NFA_COMPOSING)
+ // COMPOSING->out1 = END_COMPOSING
+ patch(list1(&s->out1), s1);
+
+ PUSH(frag(s, list1(&s1->out)));
+ break;
+
+ case NFA_BACKREF1:
+ case NFA_BACKREF2:
+ case NFA_BACKREF3:
+ case NFA_BACKREF4:
+ case NFA_BACKREF5:
+ case NFA_BACKREF6:
+ case NFA_BACKREF7:
+ case NFA_BACKREF8:
+ case NFA_BACKREF9:
+#ifdef FEAT_SYN_HL
+ case NFA_ZREF1:
+ case NFA_ZREF2:
+ case NFA_ZREF3:
+ case NFA_ZREF4:
+ case NFA_ZREF5:
+ case NFA_ZREF6:
+ case NFA_ZREF7:
+ case NFA_ZREF8:
+ case NFA_ZREF9:
+#endif
+ if (nfa_calc_size == TRUE)
+ {
+ nstate += 2;
+ break;
+ }
+ s = alloc_state(*p, NULL, NULL);
+ if (s == NULL)
+ goto theend;
+ s1 = alloc_state(NFA_SKIP, NULL, NULL);
+ if (s1 == NULL)
+ goto theend;
+ patch(list1(&s->out), s1);
+ PUSH(frag(s, list1(&s1->out)));
+ break;
+
+ case NFA_LNUM:
+ case NFA_LNUM_GT:
+ case NFA_LNUM_LT:
+ case NFA_VCOL:
+ case NFA_VCOL_GT:
+ case NFA_VCOL_LT:
+ case NFA_COL:
+ case NFA_COL_GT:
+ case NFA_COL_LT:
+ case NFA_MARK:
+ case NFA_MARK_GT:
+ case NFA_MARK_LT:
+ {
+ int n = *++p; // lnum, col or mark name
+
+ if (nfa_calc_size == TRUE)
+ {
+ nstate += 1;
+ break;
+ }
+ s = alloc_state(p[-1], NULL, NULL);
+ if (s == NULL)
+ goto theend;
+ s->val = n;
+ PUSH(frag(s, list1(&s->out)));
+ break;
+ }
+
+ case NFA_ZSTART:
+ case NFA_ZEND:
+ default:
+ // Operands
+ if (nfa_calc_size == TRUE)
+ {
+ nstate++;
+ break;
+ }
+ s = alloc_state(*p, NULL, NULL);
+ if (s == NULL)
+ goto theend;
+ PUSH(frag(s, list1(&s->out)));
+ break;
+
+ } // switch(*p)
+
+ } // for(p = postfix; *p; ++p)
+
+ if (nfa_calc_size == TRUE)
+ {
+ nstate++;
+ goto theend; // Return value when counting size is ignored anyway
+ }
+
+ e = POP();
+ if (stackp != stack)
+ {
+ vim_free(stack);
+ EMSG_RET_NULL(_(e_nfa_regexp_while_converting_from_postfix_to_nfa_too_many_stats_left_on_stack));
+ }
+
+ if (istate >= nstate)
+ {
+ vim_free(stack);
+ EMSG_RET_NULL(_(e_nfa_regexp_not_enough_space_to_store_whole_nfa));
+ }
+
+ matchstate = &state_ptr[istate++]; // the match state
+ matchstate->c = NFA_MATCH;
+ matchstate->out = matchstate->out1 = NULL;
+ matchstate->id = 0;
+
+ patch(e.out, matchstate);
+ ret = e.start;
+
+theend:
+ vim_free(stack);
+ return ret;
+
+#undef POP1
+#undef PUSH1
+#undef POP2
+#undef PUSH2
+#undef POP
+#undef PUSH
+}
+
+/*
+ * After building the NFA program, inspect it to add optimization hints.
+ */
+ static void
+nfa_postprocess(nfa_regprog_T *prog)
+{
+ int i;
+ int c;
+
+ for (i = 0; i < prog->nstate; ++i)
+ {
+ c = prog->state[i].c;
+ if (c == NFA_START_INVISIBLE
+ || c == NFA_START_INVISIBLE_NEG
+ || c == NFA_START_INVISIBLE_BEFORE
+ || c == NFA_START_INVISIBLE_BEFORE_NEG)
+ {
+ int directly;
+
+ // Do it directly when what follows is possibly the end of the
+ // match.
+ if (match_follows(prog->state[i].out1->out, 0))
+ directly = TRUE;
+ else
+ {
+ int ch_invisible = failure_chance(prog->state[i].out, 0);
+ int ch_follows = failure_chance(prog->state[i].out1->out, 0);
+
+ // Postpone when the invisible match is expensive or has a
+ // lower chance of failing.
+ if (c == NFA_START_INVISIBLE_BEFORE
+ || c == NFA_START_INVISIBLE_BEFORE_NEG)
+ {
+ // "before" matches are very expensive when
+ // unbounded, always prefer what follows then,
+ // unless what follows will always match.
+ // Otherwise strongly prefer what follows.
+ if (prog->state[i].val <= 0 && ch_follows > 0)
+ directly = FALSE;
+ else
+ directly = ch_follows * 10 < ch_invisible;
+ }
+ else
+ {
+ // normal invisible, first do the one with the
+ // highest failure chance
+ directly = ch_follows < ch_invisible;
+ }
+ }
+ if (directly)
+ // switch to the _FIRST state
+ ++prog->state[i].c;
+ }
+ }
+}
+
+/////////////////////////////////////////////////////////////////
+// NFA execution code.
+/////////////////////////////////////////////////////////////////
+
+typedef struct
+{
+ int in_use; // number of subexpr with useful info
+
+ // When REG_MULTI is TRUE list.multi is used, otherwise list.line.
+ union
+ {
+ struct multipos
+ {
+ linenr_T start_lnum;
+ linenr_T end_lnum;
+ colnr_T start_col;
+ colnr_T end_col;
+ } multi[NSUBEXP];
+ struct linepos
+ {
+ char_u *start;
+ char_u *end;
+ } line[NSUBEXP];
+ } list;
+ colnr_T orig_start_col; // list.multi[0].start_col without \zs
+} regsub_T;
+
+typedef struct
+{
+ regsub_T norm; // \( .. \) matches
+#ifdef FEAT_SYN_HL
+ regsub_T synt; // \z( .. \) matches
+#endif
+} regsubs_T;
+
+// nfa_pim_T stores a Postponed Invisible Match.
+typedef struct nfa_pim_S nfa_pim_T;
+struct nfa_pim_S
+{
+ int result; // NFA_PIM_*, see below
+ nfa_state_T *state; // the invisible match start state
+ regsubs_T subs; // submatch info, only party used
+ union
+ {
+ lpos_T pos;
+ char_u *ptr;
+ } end; // where the match must end
+};
+
+// Values for done in nfa_pim_T.
+#define NFA_PIM_UNUSED 0 // pim not used
+#define NFA_PIM_TODO 1 // pim not done yet
+#define NFA_PIM_MATCH 2 // pim executed, matches
+#define NFA_PIM_NOMATCH 3 // pim executed, no match
+
+
+// nfa_thread_T contains execution information of a NFA state
+typedef struct
+{
+ nfa_state_T *state;
+ int count;
+ nfa_pim_T pim; // if pim.result != NFA_PIM_UNUSED: postponed
+ // invisible match
+ regsubs_T subs; // submatch info, only party used
+} nfa_thread_T;
+
+// nfa_list_T contains the alternative NFA execution states.
+typedef struct
+{
+ nfa_thread_T *t; // allocated array of states
+ int n; // nr of states currently in "t"
+ int len; // max nr of states in "t"
+ int id; // ID of the list
+ int has_pim; // TRUE when any state has a PIM
+} nfa_list_T;
+
+#ifdef ENABLE_LOG
+static void log_subexpr(regsub_T *sub);
+
+ static void
+log_subsexpr(regsubs_T *subs)
+{
+ log_subexpr(&subs->norm);
+# ifdef FEAT_SYN_HL
+ if (rex.nfa_has_zsubexpr)
+ log_subexpr(&subs->synt);
+# endif
+}
+
+ static void
+log_subexpr(regsub_T *sub)
+{
+ int j;
+
+ for (j = 0; j < sub->in_use; j++)
+ if (REG_MULTI)
+ fprintf(log_fd,
+ "*** group %d, start: c=%d, l=%d, end: c=%d, l=%d\n",
+ j,
+ sub->list.multi[j].start_col,
+ (int)sub->list.multi[j].start_lnum,
+ sub->list.multi[j].end_col,
+ (int)sub->list.multi[j].end_lnum);
+ else
+ {
+ char *s = (char *)sub->list.line[j].start;
+ char *e = (char *)sub->list.line[j].end;
+
+ fprintf(log_fd, "*** group %d, start: \"%s\", end: \"%s\"\n",
+ j,
+ s == NULL ? "NULL" : s,
+ e == NULL ? "NULL" : e);
+ }
+}
+
+ static char *
+pim_info(nfa_pim_T *pim)
+{
+ static char buf[30];
+
+ if (pim == NULL || pim->result == NFA_PIM_UNUSED)
+ buf[0] = NUL;
+ else
+ {
+ sprintf(buf, " PIM col %d", REG_MULTI ? (int)pim->end.pos.col
+ : (int)(pim->end.ptr - rex.input));
+ }
+ return buf;
+}
+
+#endif
+
+// Used during execution: whether a match has been found.
+static int nfa_match;
+#ifdef FEAT_RELTIME
+static int *nfa_timed_out;
+#endif
+
+static void copy_sub(regsub_T *to, regsub_T *from);
+static int pim_equal(nfa_pim_T *one, nfa_pim_T *two);
+
+/*
+ * Copy postponed invisible match info from "from" to "to".
+ */
+ static void
+copy_pim(nfa_pim_T *to, nfa_pim_T *from)
+{
+ to->result = from->result;
+ to->state = from->state;
+ copy_sub(&to->subs.norm, &from->subs.norm);
+#ifdef FEAT_SYN_HL
+ if (rex.nfa_has_zsubexpr)
+ copy_sub(&to->subs.synt, &from->subs.synt);
+#endif
+ to->end = from->end;
+}
+
+ static void
+clear_sub(regsub_T *sub)
+{
+ if (REG_MULTI)
+ // Use 0xff to set lnum to -1
+ vim_memset(sub->list.multi, 0xff,
+ sizeof(struct multipos) * rex.nfa_nsubexpr);
+ else
+ vim_memset(sub->list.line, 0,
+ sizeof(struct linepos) * rex.nfa_nsubexpr);
+ sub->in_use = 0;
+}
+
+/*
+ * Copy the submatches from "from" to "to".
+ */
+ static void
+copy_sub(regsub_T *to, regsub_T *from)
+{
+ to->in_use = from->in_use;
+ if (from->in_use <= 0)
+ return;
+
+ // Copy the match start and end positions.
+ if (REG_MULTI)
+ {
+ mch_memmove(&to->list.multi[0],
+ &from->list.multi[0],
+ sizeof(struct multipos) * from->in_use);
+ to->orig_start_col = from->orig_start_col;
+ }
+ else
+ mch_memmove(&to->list.line[0],
+ &from->list.line[0],
+ sizeof(struct linepos) * from->in_use);
+}
+
+/*
+ * Like copy_sub() but exclude the main match.
+ */
+ static void
+copy_sub_off(regsub_T *to, regsub_T *from)
+{
+ if (to->in_use < from->in_use)
+ to->in_use = from->in_use;
+ if (from->in_use <= 1)
+ return;
+
+ // Copy the match start and end positions.
+ if (REG_MULTI)
+ mch_memmove(&to->list.multi[1],
+ &from->list.multi[1],
+ sizeof(struct multipos) * (from->in_use - 1));
+ else
+ mch_memmove(&to->list.line[1],
+ &from->list.line[1],
+ sizeof(struct linepos) * (from->in_use - 1));
+}
+
+/*
+ * Like copy_sub() but only do the end of the main match if \ze is present.
+ */
+ static void
+copy_ze_off(regsub_T *to, regsub_T *from)
+{
+ if (!rex.nfa_has_zend)
+ return;
+
+ if (REG_MULTI)
+ {
+ if (from->list.multi[0].end_lnum >= 0)
+ {
+ to->list.multi[0].end_lnum = from->list.multi[0].end_lnum;
+ to->list.multi[0].end_col = from->list.multi[0].end_col;
+ }
+ }
+ else
+ {
+ if (from->list.line[0].end != NULL)
+ to->list.line[0].end = from->list.line[0].end;
+ }
+}
+
+/*
+ * Return TRUE if "sub1" and "sub2" have the same start positions.
+ * When using back-references also check the end position.
+ */
+ static int
+sub_equal(regsub_T *sub1, regsub_T *sub2)
+{
+ int i;
+ int todo;
+ linenr_T s1;
+ linenr_T s2;
+ char_u *sp1;
+ char_u *sp2;
+
+ todo = sub1->in_use > sub2->in_use ? sub1->in_use : sub2->in_use;
+ if (REG_MULTI)
+ {
+ for (i = 0; i < todo; ++i)
+ {
+ if (i < sub1->in_use)
+ s1 = sub1->list.multi[i].start_lnum;
+ else
+ s1 = -1;
+ if (i < sub2->in_use)
+ s2 = sub2->list.multi[i].start_lnum;
+ else
+ s2 = -1;
+ if (s1 != s2)
+ return FALSE;
+ if (s1 != -1 && sub1->list.multi[i].start_col
+ != sub2->list.multi[i].start_col)
+ return FALSE;
+
+ if (rex.nfa_has_backref)
+ {
+ if (i < sub1->in_use)
+ s1 = sub1->list.multi[i].end_lnum;
+ else
+ s1 = -1;
+ if (i < sub2->in_use)
+ s2 = sub2->list.multi[i].end_lnum;
+ else
+ s2 = -1;
+ if (s1 != s2)
+ return FALSE;
+ if (s1 != -1 && sub1->list.multi[i].end_col
+ != sub2->list.multi[i].end_col)
+ return FALSE;
+ }
+ }
+ }
+ else
+ {
+ for (i = 0; i < todo; ++i)
+ {
+ if (i < sub1->in_use)
+ sp1 = sub1->list.line[i].start;
+ else
+ sp1 = NULL;
+ if (i < sub2->in_use)
+ sp2 = sub2->list.line[i].start;
+ else
+ sp2 = NULL;
+ if (sp1 != sp2)
+ return FALSE;
+ if (rex.nfa_has_backref)
+ {
+ if (i < sub1->in_use)
+ sp1 = sub1->list.line[i].end;
+ else
+ sp1 = NULL;
+ if (i < sub2->in_use)
+ sp2 = sub2->list.line[i].end;
+ else
+ sp2 = NULL;
+ if (sp1 != sp2)
+ return FALSE;
+ }
+ }
+ }
+
+ return TRUE;
+}
+
+#ifdef FEAT_RELTIME
+/*
+ * Check if we are past the time limit, if there is one.
+ */
+ static int
+nfa_did_time_out(void)
+{
+ if (*timeout_flag)
+ {
+ if (nfa_timed_out != NULL)
+ {
+# ifdef FEAT_EVAL
+ if (!*nfa_timed_out)
+ ch_log(NULL, "NFA regexp timed out");
+# endif
+ *nfa_timed_out = TRUE;
+ }
+ return TRUE;
+ }
+ return FALSE;
+}
+#endif
+
+#ifdef ENABLE_LOG
+ static void
+open_debug_log(int result)
+{
+ log_fd = fopen(NFA_REGEXP_RUN_LOG, "a");
+ if (log_fd == NULL)
+ {
+ emsg(_(e_log_open_failed));
+ log_fd = stderr;
+ }
+
+ fprintf(log_fd, "****************************\n");
+ fprintf(log_fd, "FINISHED RUNNING nfa_regmatch() recursively\n");
+ fprintf(log_fd, "MATCH = %s\n", result == TRUE ? "OK" : result == MAYBE
+ ? "MAYBE" : "FALSE");
+ fprintf(log_fd, "****************************\n");
+}
+
+ static void
+report_state(char *action,
+ regsub_T *sub,
+ nfa_state_T *state,
+ int lid,
+ nfa_pim_T *pim)
+{
+ int col;
+
+ if (sub->in_use <= 0)
+ col = -1;
+ else if (REG_MULTI)
+ col = sub->list.multi[0].start_col;
+ else
+ col = (int)(sub->list.line[0].start - rex.line);
+ nfa_set_code(state->c);
+ if (log_fd == NULL)
+ open_debug_log(MAYBE);
+
+ fprintf(log_fd, "> %s state %d to list %d. char %d: %s (start col %d)%s\n",
+ action, abs(state->id), lid, state->c, code, col,
+ pim_info(pim));
+}
+#endif
+
+/*
+ * Return TRUE if the same state is already in list "l" with the same
+ * positions as "subs".
+ */
+ static int
+has_state_with_pos(
+ nfa_list_T *l, // runtime state list
+ nfa_state_T *state, // state to update
+ regsubs_T *subs, // pointers to subexpressions
+ nfa_pim_T *pim) // postponed match or NULL
+{
+ nfa_thread_T *thread;
+ int i;
+
+ for (i = 0; i < l->n; ++i)
+ {
+ thread = &l->t[i];
+ if (thread->state->id == state->id
+ && sub_equal(&thread->subs.norm, &subs->norm)
+#ifdef FEAT_SYN_HL
+ && (!rex.nfa_has_zsubexpr
+ || sub_equal(&thread->subs.synt, &subs->synt))
+#endif
+ && pim_equal(&thread->pim, pim))
+ return TRUE;
+ }
+ return FALSE;
+}
+
+/*
+ * Return TRUE if "one" and "two" are equal. That includes when both are not
+ * set.
+ */
+ static int
+pim_equal(nfa_pim_T *one, nfa_pim_T *two)
+{
+ int one_unused = (one == NULL || one->result == NFA_PIM_UNUSED);
+ int two_unused = (two == NULL || two->result == NFA_PIM_UNUSED);
+
+ if (one_unused)
+ // one is unused: equal when two is also unused
+ return two_unused;
+ if (two_unused)
+ // one is used and two is not: not equal
+ return FALSE;
+ // compare the state id
+ if (one->state->id != two->state->id)
+ return FALSE;
+ // compare the position
+ if (REG_MULTI)
+ return one->end.pos.lnum == two->end.pos.lnum
+ && one->end.pos.col == two->end.pos.col;
+ return one->end.ptr == two->end.ptr;
+}
+
+/*
+ * Return TRUE if "state" leads to a NFA_MATCH without advancing the input.
+ */
+ static int
+match_follows(nfa_state_T *startstate, int depth)
+{
+ nfa_state_T *state = startstate;
+
+ // avoid too much recursion
+ if (depth > 10)
+ return FALSE;
+
+ while (state != NULL)
+ {
+ switch (state->c)
+ {
+ case NFA_MATCH:
+ case NFA_MCLOSE:
+ case NFA_END_INVISIBLE:
+ case NFA_END_INVISIBLE_NEG:
+ case NFA_END_PATTERN:
+ return TRUE;
+
+ case NFA_SPLIT:
+ return match_follows(state->out, depth + 1)
+ || match_follows(state->out1, depth + 1);
+
+ case NFA_START_INVISIBLE:
+ case NFA_START_INVISIBLE_FIRST:
+ case NFA_START_INVISIBLE_BEFORE:
+ case NFA_START_INVISIBLE_BEFORE_FIRST:
+ case NFA_START_INVISIBLE_NEG:
+ case NFA_START_INVISIBLE_NEG_FIRST:
+ case NFA_START_INVISIBLE_BEFORE_NEG:
+ case NFA_START_INVISIBLE_BEFORE_NEG_FIRST:
+ case NFA_COMPOSING:
+ // skip ahead to next state
+ state = state->out1->out;
+ continue;
+
+ case NFA_ANY:
+ case NFA_ANY_COMPOSING:
+ case NFA_IDENT:
+ case NFA_SIDENT:
+ case NFA_KWORD:
+ case NFA_SKWORD:
+ case NFA_FNAME:
+ case NFA_SFNAME:
+ case NFA_PRINT:
+ case NFA_SPRINT:
+ case NFA_WHITE:
+ case NFA_NWHITE:
+ case NFA_DIGIT:
+ case NFA_NDIGIT:
+ case NFA_HEX:
+ case NFA_NHEX:
+ case NFA_OCTAL:
+ case NFA_NOCTAL:
+ case NFA_WORD:
+ case NFA_NWORD:
+ case NFA_HEAD:
+ case NFA_NHEAD:
+ case NFA_ALPHA:
+ case NFA_NALPHA:
+ case NFA_LOWER:
+ case NFA_NLOWER:
+ case NFA_UPPER:
+ case NFA_NUPPER:
+ case NFA_LOWER_IC:
+ case NFA_NLOWER_IC:
+ case NFA_UPPER_IC:
+ case NFA_NUPPER_IC:
+ case NFA_START_COLL:
+ case NFA_START_NEG_COLL:
+ case NFA_NEWL:
+ // state will advance input
+ return FALSE;
+
+ default:
+ if (state->c > 0)
+ // state will advance input
+ return FALSE;
+
+ // Others: zero-width or possibly zero-width, might still find
+ // a match at the same position, keep looking.
+ break;
+ }
+ state = state->out;
+ }
+ return FALSE;
+}
+
+
+/*
+ * Return TRUE if "state" is already in list "l".
+ */
+ static int
+state_in_list(
+ nfa_list_T *l, // runtime state list
+ nfa_state_T *state, // state to update
+ regsubs_T *subs) // pointers to subexpressions
+{
+ if (state->lastlist[nfa_ll_index] == l->id)
+ {
+ if (!rex.nfa_has_backref || has_state_with_pos(l, state, subs, NULL))
+ return TRUE;
+ }
+ return FALSE;
+}
+
+// Offset used for "off" by addstate_here().
+#define ADDSTATE_HERE_OFFSET 10
+
+/*
+ * Add "state" and possibly what follows to state list ".".
+ * Returns "subs_arg", possibly copied into temp_subs.
+ * Returns NULL when recursiveness is too deep or timed out.
+ */
+ static regsubs_T *
+addstate(
+ nfa_list_T *l, // runtime state list
+ nfa_state_T *state, // state to update
+ regsubs_T *subs_arg, // pointers to subexpressions
+ nfa_pim_T *pim, // postponed look-behind match
+ int off_arg) // byte offset, when -1 go to next line
+{
+ int subidx;
+ int off = off_arg;
+ int add_here = FALSE;
+ int listindex = 0;
+ int k;
+ int found = FALSE;
+ nfa_thread_T *thread;
+ struct multipos save_multipos;
+ int save_in_use;
+ char_u *save_ptr;
+ int i;
+ regsub_T *sub;
+ regsubs_T *subs = subs_arg;
+ static regsubs_T temp_subs;
+#ifdef ENABLE_LOG
+ int did_print = FALSE;
+#endif
+ static int depth = 0;
+
+#ifdef FEAT_RELTIME
+ if (nfa_did_time_out())
+ return NULL;
+#endif
+
+ // This function is called recursively. When the depth is too much we run
+ // out of stack and crash, limit recursiveness here.
+ if (++depth >= 5000 || subs == NULL)
+ {
+ --depth;
+ return NULL;
+ }
+
+ if (off_arg <= -ADDSTATE_HERE_OFFSET)
+ {
+ add_here = TRUE;
+ off = 0;
+ listindex = -(off_arg + ADDSTATE_HERE_OFFSET);
+ }
+
+ switch (state->c)
+ {
+ case NFA_NCLOSE:
+ case NFA_MCLOSE:
+ case NFA_MCLOSE1:
+ case NFA_MCLOSE2:
+ case NFA_MCLOSE3:
+ case NFA_MCLOSE4:
+ case NFA_MCLOSE5:
+ case NFA_MCLOSE6:
+ case NFA_MCLOSE7:
+ case NFA_MCLOSE8:
+ case NFA_MCLOSE9:
+#ifdef FEAT_SYN_HL
+ case NFA_ZCLOSE:
+ case NFA_ZCLOSE1:
+ case NFA_ZCLOSE2:
+ case NFA_ZCLOSE3:
+ case NFA_ZCLOSE4:
+ case NFA_ZCLOSE5:
+ case NFA_ZCLOSE6:
+ case NFA_ZCLOSE7:
+ case NFA_ZCLOSE8:
+ case NFA_ZCLOSE9:
+#endif
+ case NFA_MOPEN:
+ case NFA_ZEND:
+ case NFA_SPLIT:
+ case NFA_EMPTY:
+ // These nodes are not added themselves but their "out" and/or
+ // "out1" may be added below.
+ break;
+
+ case NFA_BOL:
+ case NFA_BOF:
+ // "^" won't match past end-of-line, don't bother trying.
+ // Except when at the end of the line, or when we are going to the
+ // next line for a look-behind match.
+ if (rex.input > rex.line
+ && *rex.input != NUL
+ && (nfa_endp == NULL
+ || !REG_MULTI
+ || rex.lnum == nfa_endp->se_u.pos.lnum))
+ goto skip_add;
+ // FALLTHROUGH
+
+ case NFA_MOPEN1:
+ case NFA_MOPEN2:
+ case NFA_MOPEN3:
+ case NFA_MOPEN4:
+ case NFA_MOPEN5:
+ case NFA_MOPEN6:
+ case NFA_MOPEN7:
+ case NFA_MOPEN8:
+ case NFA_MOPEN9:
+#ifdef FEAT_SYN_HL
+ case NFA_ZOPEN:
+ case NFA_ZOPEN1:
+ case NFA_ZOPEN2:
+ case NFA_ZOPEN3:
+ case NFA_ZOPEN4:
+ case NFA_ZOPEN5:
+ case NFA_ZOPEN6:
+ case NFA_ZOPEN7:
+ case NFA_ZOPEN8:
+ case NFA_ZOPEN9:
+#endif
+ case NFA_NOPEN:
+ case NFA_ZSTART:
+ // These nodes need to be added so that we can bail out when it
+ // was added to this list before at the same position to avoid an
+ // endless loop for "\(\)*"
+
+ default:
+ if (state->lastlist[nfa_ll_index] == l->id && state->c != NFA_SKIP)
+ {
+ // This state is already in the list, don't add it again,
+ // unless it is an MOPEN that is used for a backreference or
+ // when there is a PIM. For NFA_MATCH check the position,
+ // lower position is preferred.
+ if (!rex.nfa_has_backref && pim == NULL && !l->has_pim
+ && state->c != NFA_MATCH)
+ {
+ // When called from addstate_here() do insert before
+ // existing states.
+ if (add_here)
+ {
+ for (k = 0; k < l->n && k < listindex; ++k)
+ if (l->t[k].state->id == state->id)
+ {
+ found = TRUE;
+ break;
+ }
+ }
+ if (!add_here || found)
+ {
+skip_add:
+#ifdef ENABLE_LOG
+ nfa_set_code(state->c);
+ fprintf(log_fd, "> Not adding state %d to list %d. char %d: %s pim: %s has_pim: %d found: %d\n",
+ abs(state->id), l->id, state->c, code,
+ pim == NULL ? "NULL" : "yes", l->has_pim, found);
+#endif
+ --depth;
+ return subs;
+ }
+ }
+
+ // Do not add the state again when it exists with the same
+ // positions.
+ if (has_state_with_pos(l, state, subs, pim))
+ goto skip_add;
+ }
+
+ // When there are backreferences or PIMs the number of states may
+ // be (a lot) bigger than anticipated.
+ if (l->n == l->len)
+ {
+ int newlen = l->len * 3 / 2 + 50;
+ size_t newsize = newlen * sizeof(nfa_thread_T);
+ nfa_thread_T *newt;
+
+ if ((long)(newsize >> 10) >= p_mmp)
+ {
+ emsg(_(e_pattern_uses_more_memory_than_maxmempattern));
+ --depth;
+ return NULL;
+ }
+ if (subs != &temp_subs)
+ {
+ // "subs" may point into the current array, need to make a
+ // copy before it becomes invalid.
+ copy_sub(&temp_subs.norm, &subs->norm);
+#ifdef FEAT_SYN_HL
+ if (rex.nfa_has_zsubexpr)
+ copy_sub(&temp_subs.synt, &subs->synt);
+#endif
+ subs = &temp_subs;
+ }
+
+ newt = vim_realloc(l->t, newsize);
+ if (newt == NULL)
+ {
+ // out of memory
+ --depth;
+ return NULL;
+ }
+ l->t = newt;
+ l->len = newlen;
+ }
+
+ // add the state to the list
+ state->lastlist[nfa_ll_index] = l->id;
+ thread = &l->t[l->n++];
+ thread->state = state;
+ if (pim == NULL)
+ thread->pim.result = NFA_PIM_UNUSED;
+ else
+ {
+ copy_pim(&thread->pim, pim);
+ l->has_pim = TRUE;
+ }
+ copy_sub(&thread->subs.norm, &subs->norm);
+#ifdef FEAT_SYN_HL
+ if (rex.nfa_has_zsubexpr)
+ copy_sub(&thread->subs.synt, &subs->synt);
+#endif
+#ifdef ENABLE_LOG
+ report_state("Adding", &thread->subs.norm, state, l->id, pim);
+ did_print = TRUE;
+#endif
+ }
+
+#ifdef ENABLE_LOG
+ if (!did_print)
+ report_state("Processing", &subs->norm, state, l->id, pim);
+#endif
+ switch (state->c)
+ {
+ case NFA_MATCH:
+ break;
+
+ case NFA_SPLIT:
+ // order matters here
+ subs = addstate(l, state->out, subs, pim, off_arg);
+ subs = addstate(l, state->out1, subs, pim, off_arg);
+ break;
+
+ case NFA_EMPTY:
+ case NFA_NOPEN:
+ case NFA_NCLOSE:
+ subs = addstate(l, state->out, subs, pim, off_arg);
+ break;
+
+ case NFA_MOPEN:
+ case NFA_MOPEN1:
+ case NFA_MOPEN2:
+ case NFA_MOPEN3:
+ case NFA_MOPEN4:
+ case NFA_MOPEN5:
+ case NFA_MOPEN6:
+ case NFA_MOPEN7:
+ case NFA_MOPEN8:
+ case NFA_MOPEN9:
+#ifdef FEAT_SYN_HL
+ case NFA_ZOPEN:
+ case NFA_ZOPEN1:
+ case NFA_ZOPEN2:
+ case NFA_ZOPEN3:
+ case NFA_ZOPEN4:
+ case NFA_ZOPEN5:
+ case NFA_ZOPEN6:
+ case NFA_ZOPEN7:
+ case NFA_ZOPEN8:
+ case NFA_ZOPEN9:
+#endif
+ case NFA_ZSTART:
+ if (state->c == NFA_ZSTART)
+ {
+ subidx = 0;
+ sub = &subs->norm;
+ }
+#ifdef FEAT_SYN_HL
+ else if (state->c >= NFA_ZOPEN && state->c <= NFA_ZOPEN9)
+ {
+ subidx = state->c - NFA_ZOPEN;
+ sub = &subs->synt;
+ }
+#endif
+ else
+ {
+ subidx = state->c - NFA_MOPEN;
+ sub = &subs->norm;
+ }
+
+ // avoid compiler warnings
+ save_ptr = NULL;
+ CLEAR_FIELD(save_multipos);
+
+ // Set the position (with "off" added) in the subexpression. Save
+ // and restore it when it was in use. Otherwise fill any gap.
+ if (REG_MULTI)
+ {
+ if (subidx < sub->in_use)
+ {
+ save_multipos = sub->list.multi[subidx];
+ save_in_use = -1;
+ }
+ else
+ {
+ save_in_use = sub->in_use;
+ for (i = sub->in_use; i < subidx; ++i)
+ {
+ sub->list.multi[i].start_lnum = -1;
+ sub->list.multi[i].end_lnum = -1;
+ }
+ sub->in_use = subidx + 1;
+ }
+ if (off == -1)
+ {
+ sub->list.multi[subidx].start_lnum = rex.lnum + 1;
+ sub->list.multi[subidx].start_col = 0;
+ }
+ else
+ {
+ sub->list.multi[subidx].start_lnum = rex.lnum;
+ sub->list.multi[subidx].start_col =
+ (colnr_T)(rex.input - rex.line + off);
+ }
+ sub->list.multi[subidx].end_lnum = -1;
+ }
+ else
+ {
+ if (subidx < sub->in_use)
+ {
+ save_ptr = sub->list.line[subidx].start;
+ save_in_use = -1;
+ }
+ else
+ {
+ save_in_use = sub->in_use;
+ for (i = sub->in_use; i < subidx; ++i)
+ {
+ sub->list.line[i].start = NULL;
+ sub->list.line[i].end = NULL;
+ }
+ sub->in_use = subidx + 1;
+ }
+ sub->list.line[subidx].start = rex.input + off;
+ }
+
+ subs = addstate(l, state->out, subs, pim, off_arg);
+ if (subs == NULL)
+ break;
+ // "subs" may have changed, need to set "sub" again
+#ifdef FEAT_SYN_HL
+ if (state->c >= NFA_ZOPEN && state->c <= NFA_ZOPEN9)
+ sub = &subs->synt;
+ else
+#endif
+ sub = &subs->norm;
+
+ if (save_in_use == -1)
+ {
+ if (REG_MULTI)
+ sub->list.multi[subidx] = save_multipos;
+ else
+ sub->list.line[subidx].start = save_ptr;
+ }
+ else
+ sub->in_use = save_in_use;
+ break;
+
+ case NFA_MCLOSE:
+ if (rex.nfa_has_zend && (REG_MULTI
+ ? subs->norm.list.multi[0].end_lnum >= 0
+ : subs->norm.list.line[0].end != NULL))
+ {
+ // Do not overwrite the position set by \ze.
+ subs = addstate(l, state->out, subs, pim, off_arg);
+ break;
+ }
+ // FALLTHROUGH
+ case NFA_MCLOSE1:
+ case NFA_MCLOSE2:
+ case NFA_MCLOSE3:
+ case NFA_MCLOSE4:
+ case NFA_MCLOSE5:
+ case NFA_MCLOSE6:
+ case NFA_MCLOSE7:
+ case NFA_MCLOSE8:
+ case NFA_MCLOSE9:
+#ifdef FEAT_SYN_HL
+ case NFA_ZCLOSE:
+ case NFA_ZCLOSE1:
+ case NFA_ZCLOSE2:
+ case NFA_ZCLOSE3:
+ case NFA_ZCLOSE4:
+ case NFA_ZCLOSE5:
+ case NFA_ZCLOSE6:
+ case NFA_ZCLOSE7:
+ case NFA_ZCLOSE8:
+ case NFA_ZCLOSE9:
+#endif
+ case NFA_ZEND:
+ if (state->c == NFA_ZEND)
+ {
+ subidx = 0;
+ sub = &subs->norm;
+ }
+#ifdef FEAT_SYN_HL
+ else if (state->c >= NFA_ZCLOSE && state->c <= NFA_ZCLOSE9)
+ {
+ subidx = state->c - NFA_ZCLOSE;
+ sub = &subs->synt;
+ }
+#endif
+ else
+ {
+ subidx = state->c - NFA_MCLOSE;
+ sub = &subs->norm;
+ }
+
+ // We don't fill in gaps here, there must have been an MOPEN that
+ // has done that.
+ save_in_use = sub->in_use;
+ if (sub->in_use <= subidx)
+ sub->in_use = subidx + 1;
+ if (REG_MULTI)
+ {
+ save_multipos = sub->list.multi[subidx];
+ if (off == -1)
+ {
+ sub->list.multi[subidx].end_lnum = rex.lnum + 1;
+ sub->list.multi[subidx].end_col = 0;
+ }
+ else
+ {
+ sub->list.multi[subidx].end_lnum = rex.lnum;
+ sub->list.multi[subidx].end_col =
+ (colnr_T)(rex.input - rex.line + off);
+ }
+ // avoid compiler warnings
+ save_ptr = NULL;
+ }
+ else
+ {
+ save_ptr = sub->list.line[subidx].end;
+ sub->list.line[subidx].end = rex.input + off;
+ // avoid compiler warnings
+ CLEAR_FIELD(save_multipos);
+ }
+
+ subs = addstate(l, state->out, subs, pim, off_arg);
+ if (subs == NULL)
+ break;
+ // "subs" may have changed, need to set "sub" again
+#ifdef FEAT_SYN_HL
+ if (state->c >= NFA_ZCLOSE && state->c <= NFA_ZCLOSE9)
+ sub = &subs->synt;
+ else
+#endif
+ sub = &subs->norm;
+
+ if (REG_MULTI)
+ sub->list.multi[subidx] = save_multipos;
+ else
+ sub->list.line[subidx].end = save_ptr;
+ sub->in_use = save_in_use;
+ break;
+ }
+ --depth;
+ return subs;
+}
+
+/*
+ * Like addstate(), but the new state(s) are put at position "*ip".
+ * Used for zero-width matches, next state to use is the added one.
+ * This makes sure the order of states to be tried does not change, which
+ * matters for alternatives.
+ */
+ static regsubs_T *
+addstate_here(
+ nfa_list_T *l, // runtime state list
+ nfa_state_T *state, // state to update
+ regsubs_T *subs, // pointers to subexpressions
+ nfa_pim_T *pim, // postponed look-behind match
+ int *ip)
+{
+ int tlen = l->n;
+ int count;
+ int listidx = *ip;
+ regsubs_T *r;
+
+ // First add the state(s) at the end, so that we know how many there are.
+ // Pass the listidx as offset (avoids adding another argument to
+ // addstate()).
+ r = addstate(l, state, subs, pim, -listidx - ADDSTATE_HERE_OFFSET);
+ if (r == NULL)
+ return NULL;
+
+ // when "*ip" was at the end of the list, nothing to do
+ if (listidx + 1 == tlen)
+ return r;
+
+ // re-order to put the new state at the current position
+ count = l->n - tlen;
+ if (count == 0)
+ return r; // no state got added
+ if (count == 1)
+ {
+ // overwrite the current state
+ l->t[listidx] = l->t[l->n - 1];
+ }
+ else if (count > 1)
+ {
+ if (l->n + count - 1 >= l->len)
+ {
+ // not enough space to move the new states, reallocate the list
+ // and move the states to the right position
+ int newlen = l->len * 3 / 2 + 50;
+ size_t newsize = newlen * sizeof(nfa_thread_T);
+ nfa_thread_T *newl;
+
+ if ((long)(newsize >> 10) >= p_mmp)
+ {
+ emsg(_(e_pattern_uses_more_memory_than_maxmempattern));
+ return NULL;
+ }
+ newl = alloc(newsize);
+ if (newl == NULL)
+ return NULL;
+ l->len = newlen;
+ mch_memmove(&(newl[0]),
+ &(l->t[0]),
+ sizeof(nfa_thread_T) * listidx);
+ mch_memmove(&(newl[listidx]),
+ &(l->t[l->n - count]),
+ sizeof(nfa_thread_T) * count);
+ mch_memmove(&(newl[listidx + count]),
+ &(l->t[listidx + 1]),
+ sizeof(nfa_thread_T) * (l->n - count - listidx - 1));
+ vim_free(l->t);
+ l->t = newl;
+ }
+ else
+ {
+ // make space for new states, then move them from the
+ // end to the current position
+ mch_memmove(&(l->t[listidx + count]),
+ &(l->t[listidx + 1]),
+ sizeof(nfa_thread_T) * (l->n - listidx - 1));
+ mch_memmove(&(l->t[listidx]),
+ &(l->t[l->n - 1]),
+ sizeof(nfa_thread_T) * count);
+ }
+ }
+ --l->n;
+ *ip = listidx - 1;
+
+ return r;
+}
+
+/*
+ * Check character class "class" against current character c.
+ */
+ static int
+check_char_class(int class, int c)
+{
+ switch (class)
+ {
+ case NFA_CLASS_ALNUM:
+ if (c >= 1 && c < 128 && isalnum(c))
+ return OK;
+ break;
+ case NFA_CLASS_ALPHA:
+ if (c >= 1 && c < 128 && isalpha(c))
+ return OK;
+ break;
+ case NFA_CLASS_BLANK:
+ if (c == ' ' || c == '\t')
+ return OK;
+ break;
+ case NFA_CLASS_CNTRL:
+ if (c >= 1 && c <= 127 && iscntrl(c))
+ return OK;
+ break;
+ case NFA_CLASS_DIGIT:
+ if (VIM_ISDIGIT(c))
+ return OK;
+ break;
+ case NFA_CLASS_GRAPH:
+ if (c >= 1 && c <= 127 && isgraph(c))
+ return OK;
+ break;
+ case NFA_CLASS_LOWER:
+ if (MB_ISLOWER(c) && c != 170 && c != 186)
+ return OK;
+ break;
+ case NFA_CLASS_PRINT:
+ if (vim_isprintc(c))
+ return OK;
+ break;
+ case NFA_CLASS_PUNCT:
+ if (c >= 1 && c < 128 && 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;
+ case NFA_CLASS_IDENT:
+ if (vim_isIDc(c))
+ return OK;
+ break;
+ case NFA_CLASS_KEYWORD:
+ if (reg_iswordc(c))
+ return OK;
+ break;
+ case NFA_CLASS_FNAME:
+ if (vim_isfilec(c))
+ return OK;
+ break;
+
+ default:
+ // should not be here :P
+ siemsg(_(e_nfa_regexp_invalid_character_class_nr), class);
+ return FAIL;
+ }
+ return FAIL;
+}
+
+/*
+ * Check for a match with subexpression "subidx".
+ * Return TRUE if it matches.
+ */
+ static int
+match_backref(
+ regsub_T *sub, // pointers to subexpressions
+ int subidx,
+ int *bytelen) // out: length of match in bytes
+{
+ int len;
+
+ if (sub->in_use <= subidx)
+ {
+retempty:
+ // backref was not set, match an empty string
+ *bytelen = 0;
+ return TRUE;
+ }
+
+ if (REG_MULTI)
+ {
+ if (sub->list.multi[subidx].start_lnum < 0
+ || sub->list.multi[subidx].end_lnum < 0)
+ goto retempty;
+ if (sub->list.multi[subidx].start_lnum == rex.lnum
+ && sub->list.multi[subidx].end_lnum == rex.lnum)
+ {
+ len = sub->list.multi[subidx].end_col
+ - sub->list.multi[subidx].start_col;
+ if (cstrncmp(rex.line + sub->list.multi[subidx].start_col,
+ rex.input, &len) == 0)
+ {
+ *bytelen = len;
+ return TRUE;
+ }
+ }
+ else
+ {
+ if (match_with_backref(
+ sub->list.multi[subidx].start_lnum,
+ sub->list.multi[subidx].start_col,
+ sub->list.multi[subidx].end_lnum,
+ sub->list.multi[subidx].end_col,
+ bytelen) == RA_MATCH)
+ return TRUE;
+ }
+ }
+ else
+ {
+ if (sub->list.line[subidx].start == NULL
+ || sub->list.line[subidx].end == NULL)
+ goto retempty;
+ len = (int)(sub->list.line[subidx].end - sub->list.line[subidx].start);
+ if (cstrncmp(sub->list.line[subidx].start, rex.input, &len) == 0)
+ {
+ *bytelen = len;
+ return TRUE;
+ }
+ }
+ return FALSE;
+}
+
+#ifdef FEAT_SYN_HL
+
+/*
+ * Check for a match with \z subexpression "subidx".
+ * Return TRUE if it matches.
+ */
+ static int
+match_zref(
+ int subidx,
+ int *bytelen) // out: length of match in bytes
+{
+ int len;
+
+ cleanup_zsubexpr();
+ if (re_extmatch_in == NULL || re_extmatch_in->matches[subidx] == NULL)
+ {
+ // backref was not set, match an empty string
+ *bytelen = 0;
+ return TRUE;
+ }
+
+ len = (int)STRLEN(re_extmatch_in->matches[subidx]);
+ if (cstrncmp(re_extmatch_in->matches[subidx], rex.input, &len) == 0)
+ {
+ *bytelen = len;
+ return TRUE;
+ }
+ return FALSE;
+}
+#endif
+
+/*
+ * Save list IDs for all NFA states of "prog" into "list".
+ * Also reset the IDs to zero.
+ * Only used for the recursive value lastlist[1].
+ */
+ static void
+nfa_save_listids(nfa_regprog_T *prog, int *list)
+{
+ int i;
+ nfa_state_T *p;
+
+ // Order in the list is reverse, it's a bit faster that way.
+ p = &prog->state[0];
+ for (i = prog->nstate; --i >= 0; )
+ {
+ list[i] = p->lastlist[1];
+ p->lastlist[1] = 0;
+ ++p;
+ }
+}
+
+/*
+ * Restore list IDs from "list" to all NFA states.
+ */
+ static void
+nfa_restore_listids(nfa_regprog_T *prog, int *list)
+{
+ int i;
+ nfa_state_T *p;
+
+ p = &prog->state[0];
+ for (i = prog->nstate; --i >= 0; )
+ {
+ p->lastlist[1] = list[i];
+ ++p;
+ }
+}
+
+ static int
+nfa_re_num_cmp(long_u val, int op, long_u pos)
+{
+ if (op == 1) return pos > val;
+ if (op == 2) return pos < val;
+ return val == pos;
+}
+
+static int nfa_regmatch(nfa_regprog_T *prog, nfa_state_T *start, regsubs_T *submatch, regsubs_T *m);
+
+/*
+ * Recursively call nfa_regmatch()
+ * "pim" is NULL or contains info about a Postponed Invisible Match (start
+ * position).
+ */
+ static int
+recursive_regmatch(
+ nfa_state_T *state,
+ nfa_pim_T *pim,
+ nfa_regprog_T *prog,
+ regsubs_T *submatch,
+ regsubs_T *m,
+ int **listids,
+ int *listids_len)
+{
+ int save_reginput_col = (int)(rex.input - rex.line);
+ int save_reglnum = rex.lnum;
+ int save_nfa_match = nfa_match;
+ int save_nfa_listid = rex.nfa_listid;
+ save_se_T *save_nfa_endp = nfa_endp;
+ save_se_T endpos;
+ save_se_T *endposp = NULL;
+ int result;
+ int need_restore = FALSE;
+
+ if (pim != NULL)
+ {
+ // start at the position where the postponed match was
+ if (REG_MULTI)
+ rex.input = rex.line + pim->end.pos.col;
+ else
+ rex.input = pim->end.ptr;
+ }
+
+ if (state->c == NFA_START_INVISIBLE_BEFORE
+ || state->c == NFA_START_INVISIBLE_BEFORE_FIRST
+ || state->c == NFA_START_INVISIBLE_BEFORE_NEG
+ || state->c == NFA_START_INVISIBLE_BEFORE_NEG_FIRST)
+ {
+ // The recursive match must end at the current position. When "pim" is
+ // not NULL it specifies the current position.
+ endposp = &endpos;
+ if (REG_MULTI)
+ {
+ if (pim == NULL)
+ {
+ endpos.se_u.pos.col = (int)(rex.input - rex.line);
+ endpos.se_u.pos.lnum = rex.lnum;
+ }
+ else
+ endpos.se_u.pos = pim->end.pos;
+ }
+ else
+ {
+ if (pim == NULL)
+ endpos.se_u.ptr = rex.input;
+ else
+ endpos.se_u.ptr = pim->end.ptr;
+ }
+
+ // Go back the specified number of bytes, or as far as the
+ // start of the previous line, to try matching "\@<=" or
+ // not matching "\@<!". This is very inefficient, limit the number of
+ // bytes if possible.
+ if (state->val <= 0)
+ {
+ if (REG_MULTI)
+ {
+ rex.line = reg_getline(--rex.lnum);
+ if (rex.line == NULL)
+ // can't go before the first line
+ rex.line = reg_getline(++rex.lnum);
+ }
+ rex.input = rex.line;
+ }
+ else
+ {
+ if (REG_MULTI && (int)(rex.input - rex.line) < state->val)
+ {
+ // Not enough bytes in this line, go to end of
+ // previous line.
+ rex.line = reg_getline(--rex.lnum);
+ if (rex.line == NULL)
+ {
+ // can't go before the first line
+ rex.line = reg_getline(++rex.lnum);
+ rex.input = rex.line;
+ }
+ else
+ rex.input = rex.line + STRLEN(rex.line);
+ }
+ if ((int)(rex.input - rex.line) >= state->val)
+ {
+ rex.input -= state->val;
+ if (has_mbyte)
+ rex.input -= mb_head_off(rex.line, rex.input);
+ }
+ else
+ rex.input = rex.line;
+ }
+ }
+
+#ifdef ENABLE_LOG
+ if (log_fd != stderr)
+ fclose(log_fd);
+ log_fd = NULL;
+#endif
+ // Have to clear the lastlist field of the NFA nodes, so that
+ // nfa_regmatch() and addstate() can run properly after recursion.
+ if (nfa_ll_index == 1)
+ {
+ // Already calling nfa_regmatch() recursively. Save the lastlist[1]
+ // values and clear them.
+ if (*listids == NULL || *listids_len < prog->nstate)
+ {
+ vim_free(*listids);
+ *listids = ALLOC_MULT(int, prog->nstate);
+ if (*listids == NULL)
+ {
+ emsg(_(e_nfa_regexp_could_not_allocate_memory_for_branch_traversal));
+ return 0;
+ }
+ *listids_len = prog->nstate;
+ }
+ nfa_save_listids(prog, *listids);
+ need_restore = TRUE;
+ // any value of rex.nfa_listid will do
+ }
+ else
+ {
+ // First recursive nfa_regmatch() call, switch to the second lastlist
+ // entry. Make sure rex.nfa_listid is different from a previous
+ // recursive call, because some states may still have this ID.
+ ++nfa_ll_index;
+ if (rex.nfa_listid <= rex.nfa_alt_listid)
+ rex.nfa_listid = rex.nfa_alt_listid;
+ }
+
+ // Call nfa_regmatch() to check if the current concat matches at this
+ // position. The concat ends with the node NFA_END_INVISIBLE
+ nfa_endp = endposp;
+ result = nfa_regmatch(prog, state->out, submatch, m);
+
+ if (need_restore)
+ nfa_restore_listids(prog, *listids);
+ else
+ {
+ --nfa_ll_index;
+ rex.nfa_alt_listid = rex.nfa_listid;
+ }
+
+ // restore position in input text
+ rex.lnum = save_reglnum;
+ if (REG_MULTI)
+ rex.line = reg_getline(rex.lnum);
+ rex.input = rex.line + save_reginput_col;
+ if (result != NFA_TOO_EXPENSIVE)
+ {
+ nfa_match = save_nfa_match;
+ rex.nfa_listid = save_nfa_listid;
+ }
+ nfa_endp = save_nfa_endp;
+
+#ifdef ENABLE_LOG
+ open_debug_log(result);
+#endif
+
+ return result;
+}
+
+/*
+ * Estimate the chance of a match with "state" failing.
+ * empty match: 0
+ * NFA_ANY: 1
+ * specific character: 99
+ */
+ static int
+failure_chance(nfa_state_T *state, int depth)
+{
+ int c = state->c;
+ int l, r;
+
+ // detect looping
+ if (depth > 4)
+ return 1;
+
+ switch (c)
+ {
+ case NFA_SPLIT:
+ if (state->out->c == NFA_SPLIT || state->out1->c == NFA_SPLIT)
+ // avoid recursive stuff
+ return 1;
+ // two alternatives, use the lowest failure chance
+ l = failure_chance(state->out, depth + 1);
+ r = failure_chance(state->out1, depth + 1);
+ return l < r ? l : r;
+
+ case NFA_ANY:
+ // matches anything, unlikely to fail
+ return 1;
+
+ case NFA_MATCH:
+ case NFA_MCLOSE:
+ case NFA_ANY_COMPOSING:
+ // empty match works always
+ return 0;
+
+ case NFA_START_INVISIBLE:
+ case NFA_START_INVISIBLE_FIRST:
+ case NFA_START_INVISIBLE_NEG:
+ case NFA_START_INVISIBLE_NEG_FIRST:
+ case NFA_START_INVISIBLE_BEFORE:
+ case NFA_START_INVISIBLE_BEFORE_FIRST:
+ case NFA_START_INVISIBLE_BEFORE_NEG:
+ case NFA_START_INVISIBLE_BEFORE_NEG_FIRST:
+ case NFA_START_PATTERN:
+ // recursive regmatch is expensive, use low failure chance
+ return 5;
+
+ case NFA_BOL:
+ case NFA_EOL:
+ case NFA_BOF:
+ case NFA_EOF:
+ case NFA_NEWL:
+ return 99;
+
+ case NFA_BOW:
+ case NFA_EOW:
+ return 90;
+
+ case NFA_MOPEN:
+ case NFA_MOPEN1:
+ case NFA_MOPEN2:
+ case NFA_MOPEN3:
+ case NFA_MOPEN4:
+ case NFA_MOPEN5:
+ case NFA_MOPEN6:
+ case NFA_MOPEN7:
+ case NFA_MOPEN8:
+ case NFA_MOPEN9:
+#ifdef FEAT_SYN_HL
+ case NFA_ZOPEN:
+ case NFA_ZOPEN1:
+ case NFA_ZOPEN2:
+ case NFA_ZOPEN3:
+ case NFA_ZOPEN4:
+ case NFA_ZOPEN5:
+ case NFA_ZOPEN6:
+ case NFA_ZOPEN7:
+ case NFA_ZOPEN8:
+ case NFA_ZOPEN9:
+ case NFA_ZCLOSE:
+ case NFA_ZCLOSE1:
+ case NFA_ZCLOSE2:
+ case NFA_ZCLOSE3:
+ case NFA_ZCLOSE4:
+ case NFA_ZCLOSE5:
+ case NFA_ZCLOSE6:
+ case NFA_ZCLOSE7:
+ case NFA_ZCLOSE8:
+ case NFA_ZCLOSE9:
+#endif
+ case NFA_NOPEN:
+ case NFA_MCLOSE1:
+ case NFA_MCLOSE2:
+ case NFA_MCLOSE3:
+ case NFA_MCLOSE4:
+ case NFA_MCLOSE5:
+ case NFA_MCLOSE6:
+ case NFA_MCLOSE7:
+ case NFA_MCLOSE8:
+ case NFA_MCLOSE9:
+ case NFA_NCLOSE:
+ return failure_chance(state->out, depth + 1);
+
+ case NFA_BACKREF1:
+ case NFA_BACKREF2:
+ case NFA_BACKREF3:
+ case NFA_BACKREF4:
+ case NFA_BACKREF5:
+ case NFA_BACKREF6:
+ case NFA_BACKREF7:
+ case NFA_BACKREF8:
+ case NFA_BACKREF9:
+#ifdef FEAT_SYN_HL
+ case NFA_ZREF1:
+ case NFA_ZREF2:
+ case NFA_ZREF3:
+ case NFA_ZREF4:
+ case NFA_ZREF5:
+ case NFA_ZREF6:
+ case NFA_ZREF7:
+ case NFA_ZREF8:
+ case NFA_ZREF9:
+#endif
+ // backreferences don't match in many places
+ return 94;
+
+ case NFA_LNUM_GT:
+ case NFA_LNUM_LT:
+ case NFA_COL_GT:
+ case NFA_COL_LT:
+ case NFA_VCOL_GT:
+ case NFA_VCOL_LT:
+ case NFA_MARK_GT:
+ case NFA_MARK_LT:
+ case NFA_VISUAL:
+ // before/after positions don't match very often
+ return 85;
+
+ case NFA_LNUM:
+ return 90;
+
+ case NFA_CURSOR:
+ case NFA_COL:
+ case NFA_VCOL:
+ case NFA_MARK:
+ // specific positions rarely match
+ return 98;
+
+ case NFA_COMPOSING:
+ return 95;
+
+ default:
+ if (c > 0)
+ // character match fails often
+ return 95;
+ }
+
+ // something else, includes character classes
+ return 50;
+}
+
+/*
+ * Skip until the char "c" we know a match must start with.
+ */
+ static int
+skip_to_start(int c, colnr_T *colp)
+{
+ char_u *s;
+
+ // Used often, do some work to avoid call overhead.
+ if (!rex.reg_ic && !has_mbyte)
+ s = vim_strbyte(rex.line + *colp, c);
+ else
+ s = cstrchr(rex.line + *colp, c);
+ if (s == NULL)
+ return FAIL;
+ *colp = (int)(s - rex.line);
+ return OK;
+}
+
+/*
+ * Check for a match with match_text.
+ * Called after skip_to_start() has found regstart.
+ * Returns zero for no match, 1 for a match.
+ */
+ static long
+find_match_text(colnr_T *startcol, int regstart, char_u *match_text)
+{
+ colnr_T col = *startcol;
+ int c1, c2;
+ int len1, len2;
+ int match;
+
+ for (;;)
+ {
+ match = TRUE;
+ len2 = MB_CHAR2LEN(regstart); // skip regstart
+ for (len1 = 0; match_text[len1] != NUL; len1 += MB_CHAR2LEN(c1))
+ {
+ c1 = PTR2CHAR(match_text + len1);
+ c2 = PTR2CHAR(rex.line + col + len2);
+ if (c1 != c2 && (!rex.reg_ic || MB_CASEFOLD(c1) != MB_CASEFOLD(c2)))
+ {
+ match = FALSE;
+ break;
+ }
+ len2 += enc_utf8 ? utf_ptr2len(rex.line + col + len2)
+ : MB_CHAR2LEN(c2);
+ }
+ if (match
+ // check that no composing char follows
+ && !(enc_utf8
+ && utf_iscomposing(PTR2CHAR(rex.line + col + len2))))
+ {
+ cleanup_subexpr();
+ if (REG_MULTI)
+ {
+ rex.reg_startpos[0].lnum = rex.lnum;
+ rex.reg_startpos[0].col = col;
+ rex.reg_endpos[0].lnum = rex.lnum;
+ rex.reg_endpos[0].col = col + len2;
+ }
+ else
+ {
+ rex.reg_startp[0] = rex.line + col;
+ rex.reg_endp[0] = rex.line + col + len2;
+ }
+ *startcol = col;
+ return 1L;
+ }
+
+ // Try finding regstart after the current match.
+ col += MB_CHAR2LEN(regstart); // skip regstart
+ if (skip_to_start(regstart, &col) == FAIL)
+ break;
+ }
+
+ *startcol = col;
+ return 0L;
+}
+
+/*
+ * Main matching routine.
+ *
+ * Run NFA to determine whether it matches rex.input.
+ *
+ * When "nfa_endp" is not NULL it is a required end-of-match position.
+ *
+ * Return TRUE if there is a match, FALSE if there is no match,
+ * NFA_TOO_EXPENSIVE if we end up with too many states.
+ * When there is a match "submatch" contains the positions.
+ *
+ * Note: Caller must ensure that: start != NULL.
+ */
+ static int
+nfa_regmatch(
+ nfa_regprog_T *prog,
+ nfa_state_T *start,
+ regsubs_T *submatch,
+ regsubs_T *m)
+{
+ int result = FALSE;
+ size_t size = 0;
+ int flag = 0;
+ int go_to_nextline = FALSE;
+ nfa_thread_T *t;
+ nfa_list_T list[2];
+ int listidx;
+ nfa_list_T *thislist;
+ nfa_list_T *nextlist;
+ int *listids = NULL;
+ int listids_len = 0;
+ nfa_state_T *add_state;
+ int add_here;
+ int add_count;
+ int add_off = 0;
+ int toplevel = start->c == NFA_MOPEN;
+ regsubs_T *r;
+#ifdef NFA_REGEXP_DEBUG_LOG
+ FILE *debug;
+#endif
+
+ // Some patterns may take a long time to match, especially when using
+ // recursive_regmatch(). Allow interrupting them with CTRL-C.
+ fast_breakcheck();
+ if (got_int)
+ return FALSE;
+#ifdef FEAT_RELTIME
+ if (nfa_did_time_out())
+ return FALSE;
+#endif
+
+#ifdef NFA_REGEXP_DEBUG_LOG
+ debug = fopen(NFA_REGEXP_DEBUG_LOG, "a");
+ if (debug == NULL)
+ {
+ semsg("(NFA) COULD NOT OPEN %s!", NFA_REGEXP_DEBUG_LOG);
+ return FALSE;
+ }
+#endif
+ nfa_match = FALSE;
+
+ // Allocate memory for the lists of nodes.
+ size = (prog->nstate + 1) * sizeof(nfa_thread_T);
+
+ list[0].t = alloc(size);
+ list[0].len = prog->nstate + 1;
+ list[1].t = alloc(size);
+ list[1].len = prog->nstate + 1;
+ if (list[0].t == NULL || list[1].t == NULL)
+ goto theend;
+
+#ifdef ENABLE_LOG
+ log_fd = fopen(NFA_REGEXP_RUN_LOG, "a");
+ if (log_fd == NULL)
+ {
+ emsg(_(e_log_open_failed));
+ log_fd = stderr;
+ }
+ 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");
+#endif
+
+ thislist = &list[0];
+ thislist->n = 0;
+ thislist->has_pim = FALSE;
+ nextlist = &list[1];
+ nextlist->n = 0;
+ nextlist->has_pim = FALSE;
+#ifdef ENABLE_LOG
+ fprintf(log_fd, "(---) STARTSTATE first\n");
+#endif
+ thislist->id = rex.nfa_listid + 1;
+
+ // Inline optimized code for addstate(thislist, start, m, 0) if we know
+ // it's the first MOPEN.
+ if (toplevel)
+ {
+ if (REG_MULTI)
+ {
+ m->norm.list.multi[0].start_lnum = rex.lnum;
+ m->norm.list.multi[0].start_col = (colnr_T)(rex.input - rex.line);
+ m->norm.orig_start_col = m->norm.list.multi[0].start_col;
+ }
+ else
+ m->norm.list.line[0].start = rex.input;
+ m->norm.in_use = 1;
+ r = addstate(thislist, start->out, m, NULL, 0);
+ }
+ else
+ r = addstate(thislist, start, m, NULL, 0);
+ if (r == NULL)
+ {
+ nfa_match = NFA_TOO_EXPENSIVE;
+ goto theend;
+ }
+
+#define ADD_STATE_IF_MATCH(state) \
+ if (result) \
+ { \
+ add_state = state->out; \
+ add_off = clen; \
+ }
+
+ /*
+ * Run for each character.
+ */
+ for (;;)
+ {
+ int curc;
+ int clen;
+
+ if (has_mbyte)
+ {
+ curc = (*mb_ptr2char)(rex.input);
+ clen = (*mb_ptr2len)(rex.input);
+ }
+ else
+ {
+ curc = *rex.input;
+ clen = 1;
+ }
+ if (curc == NUL)
+ {
+ clen = 0;
+ go_to_nextline = FALSE;
+ }
+
+ // swap lists
+ thislist = &list[flag];
+ nextlist = &list[flag ^= 1];
+ nextlist->n = 0; // clear nextlist
+ nextlist->has_pim = FALSE;
+ ++rex.nfa_listid;
+ if (prog->re_engine == AUTOMATIC_ENGINE
+ && (rex.nfa_listid >= NFA_MAX_STATES
+# ifdef FEAT_EVAL
+ || nfa_fail_for_testing
+# endif
+ ))
+ {
+ // too many states, retry with old engine
+ nfa_match = NFA_TOO_EXPENSIVE;
+ goto theend;
+ }
+
+ thislist->id = rex.nfa_listid;
+ nextlist->id = rex.nfa_listid + 1;
+
+#ifdef ENABLE_LOG
+ fprintf(log_fd, "------------------------------------------\n");
+ fprintf(log_fd, ">>> Reginput is \"%s\"\n", rex.input);
+ fprintf(log_fd, ">>> Advanced one character... Current char is %c (code %d) \n", curc, (int)curc);
+ fprintf(log_fd, ">>> Thislist has %d states available: ", thislist->n);
+ {
+ int i;
+
+ for (i = 0; i < thislist->n; i++)
+ fprintf(log_fd, "%d ", abs(thislist->t[i].state->id));
+ }
+ fprintf(log_fd, "\n");
+#endif
+
+#ifdef NFA_REGEXP_DEBUG_LOG
+ fprintf(debug, "\n-------------------\n");
+#endif
+ /*
+ * If the state lists are empty we can stop.
+ */
+ if (thislist->n == 0)
+ break;
+
+ // compute nextlist
+ for (listidx = 0; listidx < thislist->n; ++listidx)
+ {
+ // If the list gets very long there probably is something wrong.
+ // At least allow interrupting with CTRL-C.
+ fast_breakcheck();
+ if (got_int)
+ break;
+#ifdef FEAT_RELTIME
+ if (nfa_did_time_out())
+ break;
+#endif
+ t = &thislist->t[listidx];
+
+#ifdef NFA_REGEXP_DEBUG_LOG
+ nfa_set_code(t->state->c);
+ fprintf(debug, "%s, ", code);
+#endif
+#ifdef ENABLE_LOG
+ {
+ int col;
+
+ if (t->subs.norm.in_use <= 0)
+ col = -1;
+ else if (REG_MULTI)
+ col = t->subs.norm.list.multi[0].start_col;
+ else
+ col = (int)(t->subs.norm.list.line[0].start - rex.line);
+ nfa_set_code(t->state->c);
+ fprintf(log_fd, "(%d) char %d %s (start col %d)%s... \n",
+ abs(t->state->id), (int)t->state->c, code, col,
+ pim_info(&t->pim));
+ }
+#endif
+
+ /*
+ * Handle the possible codes of the current state.
+ * The most important is NFA_MATCH.
+ */
+ add_state = NULL;
+ add_here = FALSE;
+ add_count = 0;
+ switch (t->state->c)
+ {
+ case NFA_MATCH:
+ {
+ // If the match is not at the start of the line, ends before a
+ // composing characters and rex.reg_icombine is not set, that
+ // is not really a match.
+ if (enc_utf8 && !rex.reg_icombine
+ && rex.input != rex.line && utf_iscomposing(curc))
+ break;
+
+ nfa_match = TRUE;
+ copy_sub(&submatch->norm, &t->subs.norm);
+#ifdef FEAT_SYN_HL
+ if (rex.nfa_has_zsubexpr)
+ copy_sub(&submatch->synt, &t->subs.synt);
+#endif
+#ifdef ENABLE_LOG
+ log_subsexpr(&t->subs);
+#endif
+ // Found the left-most longest match, do not look at any other
+ // states at this position. When the list of states is going
+ // to be empty quit without advancing, so that "rex.input" is
+ // correct.
+ if (nextlist->n == 0)
+ clen = 0;
+ goto nextchar;
+ }
+
+ case NFA_END_INVISIBLE:
+ case NFA_END_INVISIBLE_NEG:
+ case NFA_END_PATTERN:
+ /*
+ * This is only encountered after a NFA_START_INVISIBLE or
+ * NFA_START_INVISIBLE_BEFORE 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(). For a look-behind match only when it ends
+ * in the position in "nfa_endp".
+ * Submatches are stored in *m, and used in the parent call.
+ */
+#ifdef ENABLE_LOG
+ if (nfa_endp != NULL)
+ {
+ if (REG_MULTI)
+ fprintf(log_fd, "Current lnum: %d, endp lnum: %d; current col: %d, endp col: %d\n",
+ (int)rex.lnum,
+ (int)nfa_endp->se_u.pos.lnum,
+ (int)(rex.input - rex.line),
+ nfa_endp->se_u.pos.col);
+ else
+ fprintf(log_fd, "Current col: %d, endp col: %d\n",
+ (int)(rex.input - rex.line),
+ (int)(nfa_endp->se_u.ptr - rex.input));
+ }
+#endif
+ // If "nfa_endp" is set it's only a match if it ends at
+ // "nfa_endp"
+ if (nfa_endp != NULL && (REG_MULTI
+ ? (rex.lnum != nfa_endp->se_u.pos.lnum
+ || (int)(rex.input - rex.line)
+ != nfa_endp->se_u.pos.col)
+ : rex.input != nfa_endp->se_u.ptr))
+ break;
+
+ // do not set submatches for \@!
+ if (t->state->c != NFA_END_INVISIBLE_NEG)
+ {
+ copy_sub(&m->norm, &t->subs.norm);
+#ifdef FEAT_SYN_HL
+ if (rex.nfa_has_zsubexpr)
+ copy_sub(&m->synt, &t->subs.synt);
+#endif
+ }
+#ifdef ENABLE_LOG
+ fprintf(log_fd, "Match found:\n");
+ log_subsexpr(m);
+#endif
+ nfa_match = TRUE;
+ // See comment above at "goto nextchar".
+ if (nextlist->n == 0)
+ clen = 0;
+ goto nextchar;
+
+ case NFA_START_INVISIBLE:
+ case NFA_START_INVISIBLE_FIRST:
+ case NFA_START_INVISIBLE_NEG:
+ case NFA_START_INVISIBLE_NEG_FIRST:
+ case NFA_START_INVISIBLE_BEFORE:
+ case NFA_START_INVISIBLE_BEFORE_FIRST:
+ case NFA_START_INVISIBLE_BEFORE_NEG:
+ case NFA_START_INVISIBLE_BEFORE_NEG_FIRST:
+ {
+#ifdef ENABLE_LOG
+ fprintf(log_fd, "Failure chance invisible: %d, what follows: %d\n",
+ failure_chance(t->state->out, 0),
+ failure_chance(t->state->out1->out, 0));
+#endif
+ // Do it directly if there already is a PIM or when
+ // nfa_postprocess() detected it will work better.
+ if (t->pim.result != NFA_PIM_UNUSED
+ || t->state->c == NFA_START_INVISIBLE_FIRST
+ || t->state->c == NFA_START_INVISIBLE_NEG_FIRST
+ || t->state->c == NFA_START_INVISIBLE_BEFORE_FIRST
+ || t->state->c == NFA_START_INVISIBLE_BEFORE_NEG_FIRST)
+ {
+ int in_use = m->norm.in_use;
+
+ // Copy submatch info for the recursive call, opposite
+ // of what happens on success below.
+ copy_sub_off(&m->norm, &t->subs.norm);
+#ifdef FEAT_SYN_HL
+ if (rex.nfa_has_zsubexpr)
+ copy_sub_off(&m->synt, &t->subs.synt);
+#endif
+
+ /*
+ * First try matching the invisible match, then what
+ * follows.
+ */
+ result = recursive_regmatch(t->state, NULL, prog,
+ submatch, m, &listids, &listids_len);
+ if (result == NFA_TOO_EXPENSIVE)
+ {
+ nfa_match = result;
+ goto theend;
+ }
+
+ // for \@! and \@<! it is a match when the result is
+ // FALSE
+ if (result != (t->state->c == NFA_START_INVISIBLE_NEG
+ || t->state->c == NFA_START_INVISIBLE_NEG_FIRST
+ || t->state->c
+ == NFA_START_INVISIBLE_BEFORE_NEG
+ || t->state->c
+ == NFA_START_INVISIBLE_BEFORE_NEG_FIRST))
+ {
+ // Copy submatch info from the recursive call
+ copy_sub_off(&t->subs.norm, &m->norm);
+#ifdef FEAT_SYN_HL
+ if (rex.nfa_has_zsubexpr)
+ copy_sub_off(&t->subs.synt, &m->synt);
+#endif
+ // If the pattern has \ze and it matched in the
+ // sub pattern, use it.
+ copy_ze_off(&t->subs.norm, &m->norm);
+
+ // t->state->out1 is the corresponding
+ // END_INVISIBLE node; Add its out to the current
+ // list (zero-width match).
+ add_here = TRUE;
+ add_state = t->state->out1->out;
+ }
+ m->norm.in_use = in_use;
+ }
+ else
+ {
+ nfa_pim_T pim;
+
+ /*
+ * First try matching what follows. Only if a match
+ * is found verify the invisible match matches. Add a
+ * nfa_pim_T to the following states, it contains info
+ * about the invisible match.
+ */
+ pim.state = t->state;
+ pim.result = NFA_PIM_TODO;
+ pim.subs.norm.in_use = 0;
+#ifdef FEAT_SYN_HL
+ pim.subs.synt.in_use = 0;
+#endif
+ if (REG_MULTI)
+ {
+ pim.end.pos.col = (int)(rex.input - rex.line);
+ pim.end.pos.lnum = rex.lnum;
+ }
+ else
+ pim.end.ptr = rex.input;
+
+ // t->state->out1 is the corresponding END_INVISIBLE
+ // node; Add its out to the current list (zero-width
+ // match).
+ if (addstate_here(thislist, t->state->out1->out,
+ &t->subs, &pim, &listidx) == NULL)
+ {
+ nfa_match = NFA_TOO_EXPENSIVE;
+ goto theend;
+ }
+ }
+ }
+ break;
+
+ case NFA_START_PATTERN:
+ {
+ nfa_state_T *skip = NULL;
+#ifdef ENABLE_LOG
+ int skip_lid = 0;
+#endif
+
+ // There is no point in trying to match the pattern if the
+ // output state is not going to be added to the list.
+ if (state_in_list(nextlist, t->state->out1->out, &t->subs))
+ {
+ skip = t->state->out1->out;
+#ifdef ENABLE_LOG
+ skip_lid = nextlist->id;
+#endif
+ }
+ else if (state_in_list(nextlist,
+ t->state->out1->out->out, &t->subs))
+ {
+ skip = t->state->out1->out->out;
+#ifdef ENABLE_LOG
+ skip_lid = nextlist->id;
+#endif
+ }
+ else if (state_in_list(thislist,
+ t->state->out1->out->out, &t->subs))
+ {
+ skip = t->state->out1->out->out;
+#ifdef ENABLE_LOG
+ skip_lid = thislist->id;
+#endif
+ }
+ if (skip != NULL)
+ {
+#ifdef ENABLE_LOG
+ nfa_set_code(skip->c);
+ fprintf(log_fd, "> Not trying to match pattern, output state %d is already in list %d. char %d: %s\n",
+ abs(skip->id), skip_lid, skip->c, code);
+#endif
+ break;
+ }
+ // Copy submatch info to the recursive call, opposite of what
+ // happens afterwards.
+ copy_sub_off(&m->norm, &t->subs.norm);
+#ifdef FEAT_SYN_HL
+ if (rex.nfa_has_zsubexpr)
+ copy_sub_off(&m->synt, &t->subs.synt);
+#endif
+
+ // First try matching the pattern.
+ result = recursive_regmatch(t->state, NULL, prog,
+ submatch, m, &listids, &listids_len);
+ if (result == NFA_TOO_EXPENSIVE)
+ {
+ nfa_match = result;
+ goto theend;
+ }
+ if (result)
+ {
+ int bytelen;
+
+#ifdef ENABLE_LOG
+ fprintf(log_fd, "NFA_START_PATTERN matches:\n");
+ log_subsexpr(m);
+#endif
+ // Copy submatch info from the recursive call
+ copy_sub_off(&t->subs.norm, &m->norm);
+#ifdef FEAT_SYN_HL
+ if (rex.nfa_has_zsubexpr)
+ copy_sub_off(&t->subs.synt, &m->synt);
+#endif
+ // Now we need to skip over the matched text and then
+ // continue with what follows.
+ if (REG_MULTI)
+ // TODO: multi-line match
+ bytelen = m->norm.list.multi[0].end_col
+ - (int)(rex.input - rex.line);
+ else
+ bytelen = (int)(m->norm.list.line[0].end - rex.input);
+
+#ifdef ENABLE_LOG
+ fprintf(log_fd, "NFA_START_PATTERN length: %d\n", bytelen);
+#endif
+ if (bytelen == 0)
+ {
+ // empty match, output of corresponding
+ // NFA_END_PATTERN/NFA_SKIP to be used at current
+ // position
+ add_here = TRUE;
+ add_state = t->state->out1->out->out;
+ }
+ else if (bytelen <= clen)
+ {
+ // match current character, output of corresponding
+ // NFA_END_PATTERN to be used at next position.
+ add_state = t->state->out1->out->out;
+ add_off = clen;
+ }
+ else
+ {
+ // skip over the matched characters, set character
+ // count in NFA_SKIP
+ add_state = t->state->out1->out;
+ add_off = bytelen;
+ add_count = bytelen - clen;
+ }
+ }
+ break;
+ }
+
+ case NFA_BOL:
+ if (rex.input == rex.line)
+ {
+ add_here = TRUE;
+ add_state = t->state->out;
+ }
+ break;
+
+ case NFA_EOL:
+ if (curc == NUL)
+ {
+ add_here = TRUE;
+ add_state = t->state->out;
+ }
+ break;
+
+ case NFA_BOW:
+ result = TRUE;
+
+ if (curc == NUL)
+ result = FALSE;
+ else if (has_mbyte)
+ {
+ int this_class;
+
+ // Get class of current and previous char (if it exists).
+ this_class = mb_get_class_buf(rex.input, rex.reg_buf);
+ if (this_class <= 1)
+ result = FALSE;
+ else if (reg_prev_class() == this_class)
+ result = FALSE;
+ }
+ else if (!vim_iswordc_buf(curc, rex.reg_buf)
+ || (rex.input > rex.line
+ && vim_iswordc_buf(rex.input[-1], rex.reg_buf)))
+ result = FALSE;
+ if (result)
+ {
+ add_here = TRUE;
+ add_state = t->state->out;
+ }
+ break;
+
+ case NFA_EOW:
+ result = TRUE;
+ if (rex.input == rex.line)
+ result = FALSE;
+ else if (has_mbyte)
+ {
+ int this_class, prev_class;
+
+ // Get class of current and previous char (if it exists).
+ this_class = mb_get_class_buf(rex.input, rex.reg_buf);
+ prev_class = reg_prev_class();
+ if (this_class == prev_class
+ || prev_class == 0 || prev_class == 1)
+ result = FALSE;
+ }
+ else if (!vim_iswordc_buf(rex.input[-1], rex.reg_buf)
+ || (rex.input[0] != NUL
+ && vim_iswordc_buf(curc, rex.reg_buf)))
+ result = FALSE;
+ if (result)
+ {
+ add_here = TRUE;
+ add_state = t->state->out;
+ }
+ break;
+
+ case NFA_BOF:
+ if (rex.lnum == 0 && rex.input == rex.line
+ && (!REG_MULTI || rex.reg_firstlnum == 1))
+ {
+ add_here = TRUE;
+ add_state = t->state->out;
+ }
+ break;
+
+ case NFA_EOF:
+ if (rex.lnum == rex.reg_maxline && curc == NUL)
+ {
+ add_here = TRUE;
+ add_state = t->state->out;
+ }
+ break;
+
+ case NFA_COMPOSING:
+ {
+ int mc = curc;
+ int len = 0;
+ nfa_state_T *end;
+ nfa_state_T *sta;
+ int cchars[MAX_MCO];
+ int ccount = 0;
+ int j;
+
+ sta = t->state->out;
+ len = 0;
+ if (utf_iscomposing(sta->c))
+ {
+ // Only match composing character(s), ignore base
+ // character. Used for ".{composing}" and "{composing}"
+ // (no preceding character).
+ len += mb_char2len(mc);
+ }
+ if (rex.reg_icombine && len == 0)
+ {
+ // If \Z was present, then ignore composing characters.
+ // When ignoring the base character this always matches.
+ if (sta->c != curc)
+ result = FAIL;
+ else
+ result = OK;
+ while (sta->c != NFA_END_COMPOSING)
+ sta = sta->out;
+ }
+
+ // Check base character matches first, unless ignored.
+ else if (len > 0 || mc == sta->c)
+ {
+ if (len == 0)
+ {
+ len += mb_char2len(mc);
+ sta = sta->out;
+ }
+
+ // We don't care about the order of composing characters.
+ // Get them into cchars[] first.
+ while (len < clen)
+ {
+ mc = mb_ptr2char(rex.input + len);
+ cchars[ccount++] = mc;
+ len += mb_char2len(mc);
+ if (ccount == MAX_MCO)
+ break;
+ }
+
+ // Check that each composing char in the pattern matches a
+ // composing char in the text. We do not check if all
+ // composing chars are matched.
+ result = OK;
+ while (sta->c != NFA_END_COMPOSING)
+ {
+ for (j = 0; j < ccount; ++j)
+ if (cchars[j] == sta->c)
+ break;
+ if (j == ccount)
+ {
+ result = FAIL;
+ break;
+ }
+ sta = sta->out;
+ }
+ }
+ else
+ result = FAIL;
+
+ end = t->state->out1; // NFA_END_COMPOSING
+ ADD_STATE_IF_MATCH(end);
+ break;
+ }
+
+ case NFA_NEWL:
+ if (curc == NUL && !rex.reg_line_lbr && REG_MULTI
+ && rex.lnum <= rex.reg_maxline)
+ {
+ go_to_nextline = TRUE;
+ // Pass -1 for the offset, which means taking the position
+ // at the start of the next line.
+ add_state = t->state->out;
+ add_off = -1;
+ }
+ else if (curc == '\n' && rex.reg_line_lbr)
+ {
+ // match \n as if it is an ordinary character
+ add_state = t->state->out;
+ add_off = 1;
+ }
+ break;
+
+ case NFA_START_COLL:
+ case NFA_START_NEG_COLL:
+ {
+ // What follows is a list of characters, until NFA_END_COLL.
+ // One of them must match or none of them must match.
+ nfa_state_T *state;
+ int result_if_matched;
+ int c1, c2;
+
+ // Never match EOL. If it's part of the collection it is added
+ // as a separate state with an OR.
+ if (curc == NUL)
+ break;
+
+ state = t->state->out;
+ result_if_matched = (t->state->c == NFA_START_COLL);
+ for (;;)
+ {
+ if (state->c == NFA_END_COLL)
+ {
+ result = !result_if_matched;
+ break;
+ }
+ if (state->c == NFA_RANGE_MIN)
+ {
+ c1 = state->val;
+ state = state->out; // advance to NFA_RANGE_MAX
+ c2 = state->val;
+#ifdef ENABLE_LOG
+ fprintf(log_fd, "NFA_RANGE_MIN curc=%d c1=%d c2=%d\n",
+ curc, c1, c2);
+#endif
+ if (curc >= c1 && curc <= c2)
+ {
+ result = result_if_matched;
+ break;
+ }
+ if (rex.reg_ic)
+ {
+ int curc_low = MB_CASEFOLD(curc);
+ int done = FALSE;
+
+ for ( ; c1 <= c2; ++c1)
+ if (MB_CASEFOLD(c1) == curc_low)
+ {
+ result = result_if_matched;
+ done = TRUE;
+ break;
+ }
+ if (done)
+ break;
+ }
+ }
+ else if (state->c < 0 ? check_char_class(state->c, curc)
+ : (curc == state->c
+ || (rex.reg_ic && MB_CASEFOLD(curc)
+ == MB_CASEFOLD(state->c))))
+ {
+ result = result_if_matched;
+ break;
+ }
+ state = state->out;
+ }
+ if (result)
+ {
+ // next state is in out of the NFA_END_COLL, out1 of
+ // START points to the END state
+ add_state = t->state->out1->out;
+ add_off = clen;
+ }
+ break;
+ }
+
+ case NFA_ANY:
+ // Any char except '\0', (end of input) does not match.
+ if (curc > 0)
+ {
+ add_state = t->state->out;
+ add_off = clen;
+ }
+ break;
+
+ case NFA_ANY_COMPOSING:
+ // On a composing character skip over it. Otherwise do
+ // nothing. Always matches.
+ if (enc_utf8 && utf_iscomposing(curc))
+ {
+ add_off = clen;
+ }
+ else
+ {
+ add_here = TRUE;
+ add_off = 0;
+ }
+ add_state = t->state->out;
+ break;
+
+ /*
+ * Character classes like \a for alpha, \d for digit etc.
+ */
+ case NFA_IDENT: // \i
+ result = vim_isIDc(curc);
+ ADD_STATE_IF_MATCH(t->state);
+ break;
+
+ case NFA_SIDENT: // \I
+ result = !VIM_ISDIGIT(curc) && vim_isIDc(curc);
+ ADD_STATE_IF_MATCH(t->state);
+ break;
+
+ case NFA_KWORD: // \k
+ result = vim_iswordp_buf(rex.input, rex.reg_buf);
+ ADD_STATE_IF_MATCH(t->state);
+ break;
+
+ case NFA_SKWORD: // \K
+ result = !VIM_ISDIGIT(curc)
+ && vim_iswordp_buf(rex.input, rex.reg_buf);
+ ADD_STATE_IF_MATCH(t->state);
+ break;
+
+ case NFA_FNAME: // \f
+ result = vim_isfilec(curc);
+ ADD_STATE_IF_MATCH(t->state);
+ break;
+
+ case NFA_SFNAME: // \F
+ result = !VIM_ISDIGIT(curc) && vim_isfilec(curc);
+ ADD_STATE_IF_MATCH(t->state);
+ break;
+
+ case NFA_PRINT: // \p
+ result = vim_isprintc(PTR2CHAR(rex.input));
+ ADD_STATE_IF_MATCH(t->state);
+ break;
+
+ case NFA_SPRINT: // \P
+ result = !VIM_ISDIGIT(curc) && vim_isprintc(PTR2CHAR(rex.input));
+ ADD_STATE_IF_MATCH(t->state);
+ break;
+
+ case NFA_WHITE: // \s
+ result = VIM_ISWHITE(curc);
+ ADD_STATE_IF_MATCH(t->state);
+ break;
+
+ case NFA_NWHITE: // \S
+ result = curc != NUL && !VIM_ISWHITE(curc);
+ ADD_STATE_IF_MATCH(t->state);
+ break;
+
+ case NFA_DIGIT: // \d
+ result = ri_digit(curc);
+ ADD_STATE_IF_MATCH(t->state);
+ break;
+
+ case NFA_NDIGIT: // \D
+ result = curc != NUL && !ri_digit(curc);
+ ADD_STATE_IF_MATCH(t->state);
+ break;
+
+ case NFA_HEX: // \x
+ result = ri_hex(curc);
+ ADD_STATE_IF_MATCH(t->state);
+ break;
+
+ case NFA_NHEX: // \X
+ result = curc != NUL && !ri_hex(curc);
+ ADD_STATE_IF_MATCH(t->state);
+ break;
+
+ case NFA_OCTAL: // \o
+ result = ri_octal(curc);
+ ADD_STATE_IF_MATCH(t->state);
+ break;
+
+ case NFA_NOCTAL: // \O
+ result = curc != NUL && !ri_octal(curc);
+ ADD_STATE_IF_MATCH(t->state);
+ break;
+
+ case NFA_WORD: // \w
+ result = ri_word(curc);
+ ADD_STATE_IF_MATCH(t->state);
+ break;
+
+ case NFA_NWORD: // \W
+ result = curc != NUL && !ri_word(curc);
+ ADD_STATE_IF_MATCH(t->state);
+ break;
+
+ case NFA_HEAD: // \h
+ result = ri_head(curc);
+ ADD_STATE_IF_MATCH(t->state);
+ break;
+
+ case NFA_NHEAD: // \H
+ result = curc != NUL && !ri_head(curc);
+ ADD_STATE_IF_MATCH(t->state);
+ break;
+
+ case NFA_ALPHA: // \a
+ result = ri_alpha(curc);
+ ADD_STATE_IF_MATCH(t->state);
+ break;
+
+ case NFA_NALPHA: // \A
+ result = curc != NUL && !ri_alpha(curc);
+ ADD_STATE_IF_MATCH(t->state);
+ break;
+
+ case NFA_LOWER: // \l
+ result = ri_lower(curc);
+ ADD_STATE_IF_MATCH(t->state);
+ break;
+
+ case NFA_NLOWER: // \L
+ result = curc != NUL && !ri_lower(curc);
+ ADD_STATE_IF_MATCH(t->state);
+ break;
+
+ case NFA_UPPER: // \u
+ result = ri_upper(curc);
+ ADD_STATE_IF_MATCH(t->state);
+ break;
+
+ case NFA_NUPPER: // \U
+ result = curc != NUL && !ri_upper(curc);
+ ADD_STATE_IF_MATCH(t->state);
+ break;
+
+ case NFA_LOWER_IC: // [a-z]
+ result = ri_lower(curc) || (rex.reg_ic && ri_upper(curc));
+ ADD_STATE_IF_MATCH(t->state);
+ break;
+
+ case NFA_NLOWER_IC: // [^a-z]
+ result = curc != NUL
+ && !(ri_lower(curc) || (rex.reg_ic && ri_upper(curc)));
+ ADD_STATE_IF_MATCH(t->state);
+ break;
+
+ case NFA_UPPER_IC: // [A-Z]
+ result = ri_upper(curc) || (rex.reg_ic && ri_lower(curc));
+ ADD_STATE_IF_MATCH(t->state);
+ break;
+
+ case NFA_NUPPER_IC: // ^[A-Z]
+ result = curc != NUL
+ && !(ri_upper(curc) || (rex.reg_ic && ri_lower(curc)));
+ ADD_STATE_IF_MATCH(t->state);
+ break;
+
+ case NFA_BACKREF1:
+ case NFA_BACKREF2:
+ case NFA_BACKREF3:
+ case NFA_BACKREF4:
+ case NFA_BACKREF5:
+ case NFA_BACKREF6:
+ case NFA_BACKREF7:
+ case NFA_BACKREF8:
+ case NFA_BACKREF9:
+#ifdef FEAT_SYN_HL
+ case NFA_ZREF1:
+ case NFA_ZREF2:
+ case NFA_ZREF3:
+ case NFA_ZREF4:
+ case NFA_ZREF5:
+ case NFA_ZREF6:
+ case NFA_ZREF7:
+ case NFA_ZREF8:
+ case NFA_ZREF9:
+#endif
+ // \1 .. \9 \z1 .. \z9
+ {
+ int subidx;
+ int bytelen;
+
+ if (t->state->c <= NFA_BACKREF9)
+ {
+ subidx = t->state->c - NFA_BACKREF1 + 1;
+ result = match_backref(&t->subs.norm, subidx, &bytelen);
+ }
+#ifdef FEAT_SYN_HL
+ else
+ {
+ subidx = t->state->c - NFA_ZREF1 + 1;
+ result = match_zref(subidx, &bytelen);
+ }
+#endif
+
+ if (result)
+ {
+ if (bytelen == 0)
+ {
+ // empty match always works, output of NFA_SKIP to be
+ // used next
+ add_here = TRUE;
+ add_state = t->state->out->out;
+ }
+ else if (bytelen <= clen)
+ {
+ // match current character, jump ahead to out of
+ // NFA_SKIP
+ add_state = t->state->out->out;
+ add_off = clen;
+ }
+ else
+ {
+ // skip over the matched characters, set character
+ // count in NFA_SKIP
+ add_state = t->state->out;
+ add_off = bytelen;
+ add_count = bytelen - clen;
+ }
+ }
+ break;
+ }
+ case NFA_SKIP:
+ // character of previous matching \1 .. \9 or \@>
+ if (t->count - clen <= 0)
+ {
+ // end of match, go to what follows
+ add_state = t->state->out;
+ add_off = clen;
+ }
+ else
+ {
+ // add state again with decremented count
+ add_state = t->state;
+ add_off = 0;
+ add_count = t->count - clen;
+ }
+ break;
+
+ case NFA_LNUM:
+ case NFA_LNUM_GT:
+ case NFA_LNUM_LT:
+ result = (REG_MULTI &&
+ nfa_re_num_cmp(t->state->val, t->state->c - NFA_LNUM,
+ (long_u)(rex.lnum + rex.reg_firstlnum)));
+ if (result)
+ {
+ add_here = TRUE;
+ add_state = t->state->out;
+ }
+ break;
+
+ case NFA_COL:
+ case NFA_COL_GT:
+ case NFA_COL_LT:
+ result = nfa_re_num_cmp(t->state->val, t->state->c - NFA_COL,
+ (long_u)(rex.input - rex.line) + 1);
+ if (result)
+ {
+ add_here = TRUE;
+ add_state = t->state->out;
+ }
+ break;
+
+ case NFA_VCOL:
+ case NFA_VCOL_GT:
+ case NFA_VCOL_LT:
+ {
+ int op = t->state->c - NFA_VCOL;
+ colnr_T col = (colnr_T)(rex.input - rex.line);
+ win_T *wp = rex.reg_win == NULL ? curwin : rex.reg_win;
+
+ // Bail out quickly when there can't be a match, avoid the
+ // overhead of win_linetabsize() on long lines.
+ if (op != 1 && col > t->state->val
+ * (has_mbyte ? MB_MAXBYTES : 1))
+ break;
+ result = FALSE;
+ if (op == 1 && col - 1 > t->state->val && col > 100)
+ {
+ int ts = wp->w_buffer->b_p_ts;
+
+ // Guess that a character won't use more columns than
+ // 'tabstop', with a minimum of 4.
+ if (ts < 4)
+ ts = 4;
+ result = col > t->state->val * ts;
+ }
+ if (!result)
+ {
+ linenr_T lnum = REG_MULTI
+ ? rex.reg_firstlnum + rex.lnum : 1;
+ long_u vcol;
+
+ if (REG_MULTI && (lnum <= 0
+ || lnum > wp->w_buffer->b_ml.ml_line_count))
+ lnum = 1;
+ vcol = (long_u)win_linetabsize(wp, lnum, rex.line, col);
+ result = nfa_re_num_cmp(t->state->val, op, vcol + 1);
+ }
+ if (result)
+ {
+ add_here = TRUE;
+ add_state = t->state->out;
+ }
+ }
+ break;
+
+ case NFA_MARK:
+ case NFA_MARK_GT:
+ case NFA_MARK_LT:
+ {
+ pos_T *pos;
+ size_t col = REG_MULTI ? rex.input - rex.line : 0;
+
+ pos = getmark_buf(rex.reg_buf, t->state->val, FALSE);
+
+ // Line may have been freed, get it again.
+ if (REG_MULTI)
+ {
+ rex.line = reg_getline(rex.lnum);
+ rex.input = rex.line + col;
+ }
+
+ // Compare the mark position to the match position, if the mark
+ // exists and mark is set in reg_buf.
+ if (pos != NULL && pos->lnum > 0)
+ {
+ colnr_T pos_col = pos->lnum == rex.lnum + rex.reg_firstlnum
+ && pos->col == MAXCOL
+ ? (colnr_T)STRLEN(reg_getline(
+ pos->lnum - rex.reg_firstlnum))
+ : pos->col;
+
+ result = (pos->lnum == rex.lnum + rex.reg_firstlnum
+ ? (pos_col == (colnr_T)(rex.input - rex.line)
+ ? t->state->c == NFA_MARK
+ : (pos_col < (colnr_T)(rex.input - rex.line)
+ ? t->state->c == NFA_MARK_GT
+ : t->state->c == NFA_MARK_LT))
+ : (pos->lnum < rex.lnum + rex.reg_firstlnum
+ ? t->state->c == NFA_MARK_GT
+ : t->state->c == NFA_MARK_LT));
+ if (result)
+ {
+ add_here = TRUE;
+ add_state = t->state->out;
+ }
+ }
+ break;
+ }
+
+ case NFA_CURSOR:
+ result = (rex.reg_win != NULL
+ && (rex.lnum + rex.reg_firstlnum
+ == rex.reg_win->w_cursor.lnum)
+ && ((colnr_T)(rex.input - rex.line)
+ == rex.reg_win->w_cursor.col));
+ if (result)
+ {
+ add_here = TRUE;
+ add_state = t->state->out;
+ }
+ break;
+
+ case NFA_VISUAL:
+ result = reg_match_visual();
+ if (result)
+ {
+ add_here = TRUE;
+ add_state = t->state->out;
+ }
+ break;
+
+ case NFA_MOPEN1:
+ case NFA_MOPEN2:
+ case NFA_MOPEN3:
+ case NFA_MOPEN4:
+ case NFA_MOPEN5:
+ case NFA_MOPEN6:
+ case NFA_MOPEN7:
+ case NFA_MOPEN8:
+ case NFA_MOPEN9:
+#ifdef FEAT_SYN_HL
+ case NFA_ZOPEN:
+ case NFA_ZOPEN1:
+ case NFA_ZOPEN2:
+ case NFA_ZOPEN3:
+ case NFA_ZOPEN4:
+ case NFA_ZOPEN5:
+ case NFA_ZOPEN6:
+ case NFA_ZOPEN7:
+ case NFA_ZOPEN8:
+ case NFA_ZOPEN9:
+#endif
+ case NFA_NOPEN:
+ case NFA_ZSTART:
+ // These states are only added to be able to bail out when
+ // they are added again, nothing is to be done.
+ break;
+
+ default: // regular character
+ {
+ int c = t->state->c;
+
+#ifdef DEBUG
+ if (c < 0)
+ siemsg("INTERNAL: Negative state char: %ld", (long)c);
+#endif
+ result = (c == curc);
+
+ if (!result && rex.reg_ic)
+ result = MB_CASEFOLD(c) == MB_CASEFOLD(curc);
+ // If rex.reg_icombine is not set only skip over the character
+ // itself. When it is set skip over composing characters.
+ if (result && enc_utf8 && !rex.reg_icombine)
+ clen = utf_ptr2len(rex.input);
+ ADD_STATE_IF_MATCH(t->state);
+ break;
+ }
+
+ } // switch (t->state->c)
+
+ if (add_state != NULL)
+ {
+ nfa_pim_T *pim;
+ nfa_pim_T pim_copy;
+
+ if (t->pim.result == NFA_PIM_UNUSED)
+ pim = NULL;
+ else
+ pim = &t->pim;
+
+ // Handle the postponed invisible match if the match might end
+ // without advancing and before the end of the line.
+ if (pim != NULL && (clen == 0 || match_follows(add_state, 0)))
+ {
+ if (pim->result == NFA_PIM_TODO)
+ {
+#ifdef ENABLE_LOG
+ fprintf(log_fd, "\n");
+ fprintf(log_fd, "==================================\n");
+ fprintf(log_fd, "Postponed recursive nfa_regmatch()\n");
+ fprintf(log_fd, "\n");
+#endif
+ result = recursive_regmatch(pim->state, pim,
+ prog, submatch, m, &listids, &listids_len);
+ pim->result = result ? NFA_PIM_MATCH : NFA_PIM_NOMATCH;
+ // for \@! and \@<! it is a match when the result is
+ // FALSE
+ if (result != (pim->state->c == NFA_START_INVISIBLE_NEG
+ || pim->state->c == NFA_START_INVISIBLE_NEG_FIRST
+ || pim->state->c
+ == NFA_START_INVISIBLE_BEFORE_NEG
+ || pim->state->c
+ == NFA_START_INVISIBLE_BEFORE_NEG_FIRST))
+ {
+ // Copy submatch info from the recursive call
+ copy_sub_off(&pim->subs.norm, &m->norm);
+#ifdef FEAT_SYN_HL
+ if (rex.nfa_has_zsubexpr)
+ copy_sub_off(&pim->subs.synt, &m->synt);
+#endif
+ }
+ }
+ else
+ {
+ result = (pim->result == NFA_PIM_MATCH);
+#ifdef ENABLE_LOG
+ fprintf(log_fd, "\n");
+ fprintf(log_fd, "Using previous recursive nfa_regmatch() result, result == %d\n", pim->result);
+ fprintf(log_fd, "MATCH = %s\n", result == TRUE ? "OK" : "FALSE");
+ fprintf(log_fd, "\n");
+#endif
+ }
+
+ // for \@! and \@<! it is a match when result is FALSE
+ if (result != (pim->state->c == NFA_START_INVISIBLE_NEG
+ || pim->state->c == NFA_START_INVISIBLE_NEG_FIRST
+ || pim->state->c
+ == NFA_START_INVISIBLE_BEFORE_NEG
+ || pim->state->c
+ == NFA_START_INVISIBLE_BEFORE_NEG_FIRST))
+ {
+ // Copy submatch info from the recursive call
+ copy_sub_off(&t->subs.norm, &pim->subs.norm);
+#ifdef FEAT_SYN_HL
+ if (rex.nfa_has_zsubexpr)
+ copy_sub_off(&t->subs.synt, &pim->subs.synt);
+#endif
+ }
+ else
+ // look-behind match failed, don't add the state
+ continue;
+
+ // Postponed invisible match was handled, don't add it to
+ // following states.
+ pim = NULL;
+ }
+
+ // If "pim" points into l->t it will become invalid when
+ // adding the state causes the list to be reallocated. Make a
+ // local copy to avoid that.
+ if (pim == &t->pim)
+ {
+ copy_pim(&pim_copy, pim);
+ pim = &pim_copy;
+ }
+
+ if (add_here)
+ r = addstate_here(thislist, add_state, &t->subs,
+ pim, &listidx);
+ else
+ {
+ r = addstate(nextlist, add_state, &t->subs, pim, add_off);
+ if (add_count > 0)
+ nextlist->t[nextlist->n - 1].count = add_count;
+ }
+ if (r == NULL)
+ {
+ nfa_match = NFA_TOO_EXPENSIVE;
+ goto theend;
+ }
+ }
+
+ } // for (thislist = thislist; thislist->state; thislist++)
+
+ // Look for the start of a match in the current position by adding the
+ // start state to the list of states.
+ // The first found match is the leftmost one, thus the order of states
+ // matters!
+ // Do not add the start state in recursive calls of nfa_regmatch(),
+ // because recursive calls should only start in the first position.
+ // Unless "nfa_endp" is not NULL, then we match the end position.
+ // Also don't start a match past the first line.
+ if (nfa_match == FALSE
+ && ((toplevel
+ && rex.lnum == 0
+ && clen != 0
+ && (rex.reg_maxcol == 0
+ || (colnr_T)(rex.input - rex.line) < rex.reg_maxcol))
+ || (nfa_endp != NULL
+ && (REG_MULTI
+ ? (rex.lnum < nfa_endp->se_u.pos.lnum
+ || (rex.lnum == nfa_endp->se_u.pos.lnum
+ && (int)(rex.input - rex.line)
+ < nfa_endp->se_u.pos.col))
+ : rex.input < nfa_endp->se_u.ptr))))
+ {
+#ifdef ENABLE_LOG
+ fprintf(log_fd, "(---) STARTSTATE\n");
+#endif
+ // Inline optimized code for addstate() if we know the state is
+ // the first MOPEN.
+ if (toplevel)
+ {
+ int add = TRUE;
+ int c;
+
+ if (prog->regstart != NUL && clen != 0)
+ {
+ if (nextlist->n == 0)
+ {
+ colnr_T col = (colnr_T)(rex.input - rex.line) + clen;
+
+ // Nextlist is empty, we can skip ahead to the
+ // character that must appear at the start.
+ if (skip_to_start(prog->regstart, &col) == FAIL)
+ break;
+#ifdef ENABLE_LOG
+ fprintf(log_fd, " Skipping ahead %d bytes to regstart\n",
+ col - ((colnr_T)(rex.input - rex.line) + clen));
+#endif
+ rex.input = rex.line + col - clen;
+ }
+ else
+ {
+ // Checking if the required start character matches is
+ // cheaper than adding a state that won't match.
+ c = PTR2CHAR(rex.input + clen);
+ if (c != prog->regstart && (!rex.reg_ic
+ || MB_CASEFOLD(c) != MB_CASEFOLD(prog->regstart)))
+ {
+#ifdef ENABLE_LOG
+ fprintf(log_fd, " Skipping start state, regstart does not match\n");
+#endif
+ add = FALSE;
+ }
+ }
+ }
+
+ if (add)
+ {
+ if (REG_MULTI)
+ {
+ m->norm.list.multi[0].start_col =
+ (colnr_T)(rex.input - rex.line) + clen;
+ m->norm.orig_start_col =
+ m->norm.list.multi[0].start_col;
+ }
+ else
+ m->norm.list.line[0].start = rex.input + clen;
+ if (addstate(nextlist, start->out, m, NULL, clen) == NULL)
+ {
+ nfa_match = NFA_TOO_EXPENSIVE;
+ goto theend;
+ }
+ }
+ }
+ else
+ {
+ if (addstate(nextlist, start, m, NULL, clen) == NULL)
+ {
+ nfa_match = NFA_TOO_EXPENSIVE;
+ goto theend;
+ }
+ }
+ }
+
+#ifdef ENABLE_LOG
+ fprintf(log_fd, ">>> Thislist had %d states available: ", thislist->n);
+ {
+ int i;
+
+ for (i = 0; i < thislist->n; i++)
+ fprintf(log_fd, "%d ", abs(thislist->t[i].state->id));
+ }
+ fprintf(log_fd, "\n");
+#endif
+
+nextchar:
+ // Advance to the next character, or advance to the next line, or
+ // finish.
+ if (clen != 0)
+ rex.input += clen;
+ else if (go_to_nextline || (nfa_endp != NULL && REG_MULTI
+ && rex.lnum < nfa_endp->se_u.pos.lnum))
+ reg_nextline();
+ else
+ break;
+
+ // Allow interrupting with CTRL-C.
+ line_breakcheck();
+ if (got_int)
+ break;
+#ifdef FEAT_RELTIME
+ if (nfa_did_time_out())
+ break;
+#endif
+ }
+
+#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(listids);
+#undef ADD_STATE_IF_MATCH
+#ifdef NFA_REGEXP_DEBUG_LOG
+ fclose(debug);
+#endif
+
+ return nfa_match;
+}
+
+/*
+ * Try match of "prog" with at rex.line["col"].
+ * Returns <= 0 for failure, number of lines contained in the match otherwise.
+ */
+ static long
+nfa_regtry(
+ nfa_regprog_T *prog,
+ colnr_T col,
+ int *timed_out UNUSED) // flag set on timeout or NULL
+{
+ int i;
+ regsubs_T subs, m;
+ nfa_state_T *start = prog->start;
+ int result;
+#ifdef ENABLE_LOG
+ FILE *f;
+#endif
+
+ rex.input = rex.line + col;
+#ifdef FEAT_RELTIME
+ nfa_timed_out = timed_out;
+#endif
+
+#ifdef ENABLE_LOG
+ f = fopen(NFA_REGEXP_RUN_LOG, "a");
+ if (f != NULL)
+ {
+ fprintf(f, "\n\n\t=======================================================\n");
+#ifdef DEBUG
+ fprintf(f, "\tRegexp is \"%s\"\n", nfa_regengine.expr);
+#endif
+ fprintf(f, "\tInput text is \"%s\" \n", rex.input);
+ fprintf(f, "\t=======================================================\n\n");
+ nfa_print_state(f, start);
+ fprintf(f, "\n\n");
+ fclose(f);
+ }
+ else
+ emsg("Could not open temporary log file for writing");
+#endif
+
+ clear_sub(&subs.norm);
+ clear_sub(&m.norm);
+#ifdef FEAT_SYN_HL
+ clear_sub(&subs.synt);
+ clear_sub(&m.synt);
+#endif
+
+ result = nfa_regmatch(prog, start, &subs, &m);
+ if (result == FALSE)
+ return 0;
+ else if (result == NFA_TOO_EXPENSIVE)
+ return result;
+
+ cleanup_subexpr();
+ if (REG_MULTI)
+ {
+ for (i = 0; i < subs.norm.in_use; i++)
+ {
+ rex.reg_startpos[i].lnum = subs.norm.list.multi[i].start_lnum;
+ rex.reg_startpos[i].col = subs.norm.list.multi[i].start_col;
+
+ rex.reg_endpos[i].lnum = subs.norm.list.multi[i].end_lnum;
+ rex.reg_endpos[i].col = subs.norm.list.multi[i].end_col;
+ }
+ if (rex.reg_mmatch != NULL)
+ rex.reg_mmatch->rmm_matchcol = subs.norm.orig_start_col;
+
+ if (rex.reg_startpos[0].lnum < 0)
+ {
+ rex.reg_startpos[0].lnum = 0;
+ rex.reg_startpos[0].col = col;
+ }
+ if (rex.reg_endpos[0].lnum < 0)
+ {
+ // pattern has a \ze but it didn't match, use current end
+ rex.reg_endpos[0].lnum = rex.lnum;
+ rex.reg_endpos[0].col = (int)(rex.input - rex.line);
+ }
+ else
+ // Use line number of "\ze".
+ rex.lnum = rex.reg_endpos[0].lnum;
+ }
+ else
+ {
+ for (i = 0; i < subs.norm.in_use; i++)
+ {
+ rex.reg_startp[i] = subs.norm.list.line[i].start;
+ rex.reg_endp[i] = subs.norm.list.line[i].end;
+ }
+
+ if (rex.reg_startp[0] == NULL)
+ rex.reg_startp[0] = rex.line + col;
+ if (rex.reg_endp[0] == NULL)
+ rex.reg_endp[0] = rex.input;
+ }
+
+#ifdef FEAT_SYN_HL
+ // Package any found \z(...\) matches for export. Default is none.
+ unref_extmatch(re_extmatch_out);
+ re_extmatch_out = NULL;
+
+ if (prog->reghasz == REX_SET)
+ {
+ cleanup_zsubexpr();
+ re_extmatch_out = make_extmatch();
+ if (re_extmatch_out == NULL)
+ return 0;
+ // Loop over \z1, \z2, etc. There is no \z0.
+ for (i = 1; i < subs.synt.in_use; i++)
+ {
+ if (REG_MULTI)
+ {
+ struct multipos *mpos = &subs.synt.list.multi[i];
+
+ // Only accept single line matches that are valid.
+ if (mpos->start_lnum >= 0
+ && mpos->start_lnum == mpos->end_lnum
+ && mpos->end_col >= mpos->start_col)
+ re_extmatch_out->matches[i] =
+ vim_strnsave(reg_getline(mpos->start_lnum)
+ + mpos->start_col,
+ mpos->end_col - mpos->start_col);
+ }
+ else
+ {
+ struct linepos *lpos = &subs.synt.list.line[i];
+
+ if (lpos->start != NULL && lpos->end != NULL)
+ re_extmatch_out->matches[i] =
+ vim_strnsave(lpos->start, lpos->end - lpos->start);
+ }
+ }
+ }
+#endif
+
+ return 1 + rex.lnum;
+}
+
+/*
+ * Match a regexp against a string ("line" points to the string) or multiple
+ * lines (if "line" is NULL, use reg_getline()).
+ *
+ * Returns <= 0 for failure, number of lines contained in the match otherwise.
+ */
+ static long
+nfa_regexec_both(
+ char_u *line,
+ colnr_T startcol, // column to start looking for match
+ int *timed_out) // flag set on timeout or NULL
+{
+ nfa_regprog_T *prog;
+ long retval = 0L;
+ int i;
+ colnr_T col = startcol;
+
+ if (REG_MULTI)
+ {
+ prog = (nfa_regprog_T *)rex.reg_mmatch->regprog;
+ line = reg_getline((linenr_T)0); // relative to the cursor
+ rex.reg_startpos = rex.reg_mmatch->startpos;
+ rex.reg_endpos = rex.reg_mmatch->endpos;
+ }
+ else
+ {
+ prog = (nfa_regprog_T *)rex.reg_match->regprog;
+ rex.reg_startp = rex.reg_match->startp;
+ rex.reg_endp = rex.reg_match->endp;
+ }
+
+ // Be paranoid...
+ if (prog == NULL || line == NULL)
+ {
+ iemsg(_(e_null_argument));
+ goto theend;
+ }
+
+ // If pattern contains "\c" or "\C": overrule value of rex.reg_ic
+ if (prog->regflags & RF_ICASE)
+ rex.reg_ic = TRUE;
+ else if (prog->regflags & RF_NOICASE)
+ rex.reg_ic = FALSE;
+
+ // If pattern contains "\Z" overrule value of rex.reg_icombine
+ if (prog->regflags & RF_ICOMBINE)
+ rex.reg_icombine = TRUE;
+
+ rex.line = line;
+ rex.lnum = 0; // relative to line
+
+ rex.nfa_has_zend = prog->has_zend;
+ rex.nfa_has_backref = prog->has_backref;
+ rex.nfa_nsubexpr = prog->nsubexp;
+ rex.nfa_listid = 1;
+ rex.nfa_alt_listid = 2;
+#ifdef DEBUG
+ nfa_regengine.expr = prog->pattern;
+#endif
+
+ if (prog->reganch && col > 0)
+ return 0L;
+
+ rex.need_clear_subexpr = TRUE;
+#ifdef FEAT_SYN_HL
+ // Clear the external match subpointers if necessary.
+ if (prog->reghasz == REX_SET)
+ {
+ rex.nfa_has_zsubexpr = TRUE;
+ rex.need_clear_zsubexpr = TRUE;
+ }
+ else
+ {
+ rex.nfa_has_zsubexpr = FALSE;
+ rex.need_clear_zsubexpr = FALSE;
+ }
+#endif
+
+ if (prog->regstart != NUL)
+ {
+ // Skip ahead until a character we know the match must start with.
+ // When there is none there is no match.
+ if (skip_to_start(prog->regstart, &col) == FAIL)
+ return 0L;
+
+ // If match_text is set it contains the full text that must match.
+ // Nothing else to try. Doesn't handle combining chars well.
+ if (prog->match_text != NULL && !rex.reg_icombine)
+ {
+ retval = find_match_text(&col, prog->regstart, prog->match_text);
+ if (REG_MULTI)
+ rex.reg_mmatch->rmm_matchcol = col;
+ else
+ rex.reg_match->rm_matchcol = col;
+ return retval;
+ }
+ }
+
+ // If the start column is past the maximum column: no need to try.
+ if (rex.reg_maxcol > 0 && col >= rex.reg_maxcol)
+ goto theend;
+
+ // Set the "nstate" used by nfa_regcomp() to zero to trigger an error when
+ // it's accidentally used during execution.
+ nstate = 0;
+ for (i = 0; i < prog->nstate; ++i)
+ {
+ prog->state[i].id = i;
+ prog->state[i].lastlist[0] = 0;
+ prog->state[i].lastlist[1] = 0;
+ }
+
+ retval = nfa_regtry(prog, col, timed_out);
+
+#ifdef DEBUG
+ nfa_regengine.expr = NULL;
+#endif
+
+theend:
+ if (retval > 0)
+ {
+ // Make sure the end is never before the start. Can happen when \zs and
+ // \ze are used.
+ if (REG_MULTI)
+ {
+ lpos_T *start = &rex.reg_mmatch->startpos[0];
+ lpos_T *end = &rex.reg_mmatch->endpos[0];
+
+ if (end->lnum < start->lnum
+ || (end->lnum == start->lnum && end->col < start->col))
+ rex.reg_mmatch->endpos[0] = rex.reg_mmatch->startpos[0];
+ }
+ else
+ {
+ if (rex.reg_match->endp[0] < rex.reg_match->startp[0])
+ rex.reg_match->endp[0] = rex.reg_match->startp[0];
+
+ // startpos[0] may be set by "\zs", also return the column where
+ // the whole pattern matched.
+ rex.reg_match->rm_matchcol = col;
+ }
+ }
+
+ 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(char_u *expr, int re_flags)
+{
+ nfa_regprog_T *prog = NULL;
+ size_t prog_size;
+ int *postfix;
+
+ if (expr == NULL)
+ return NULL;
+
+#ifdef DEBUG
+ nfa_regengine.expr = expr;
+#endif
+ nfa_re_flags = re_flags;
+
+ init_class_tab();
+
+ if (nfa_regcomp_start(expr, re_flags) == FAIL)
+ return NULL;
+
+ // 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(NFA_REGEXP_RUN_LOG, "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);
+
+ // allocate the regprog with space for the compiled regexp
+ prog_size = offsetof(nfa_regprog_T, state) + sizeof(nfa_state_T) * nstate;
+ prog = alloc(prog_size);
+ if (prog == NULL)
+ goto fail;
+ state_ptr = prog->state;
+ prog->re_in_use = FALSE;
+
+ /*
+ * 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;
+ prog->has_zend = rex.nfa_has_zend;
+ prog->has_backref = rex.nfa_has_backref;
+ prog->nsubexp = regnpar;
+
+ nfa_postprocess(prog);
+
+ prog->reganch = nfa_get_reganch(prog->start, 0);
+ prog->regstart = nfa_get_regstart(prog->start, 0);
+ prog->match_text = nfa_get_match_text(prog->start);
+
+#ifdef ENABLE_LOG
+ nfa_postfix_dump(expr, OK);
+ nfa_dump(prog);
+#endif
+#ifdef FEAT_SYN_HL
+ // Remember whether this pattern has any \z specials in it.
+ prog->reghasz = re_has_z;
+#endif
+ prog->pattern = vim_strsave(expr);
+#ifdef DEBUG
+ nfa_regengine.expr = NULL;
+#endif
+
+out:
+ VIM_CLEAR(post_start);
+ post_ptr = post_end = NULL;
+ state_ptr = NULL;
+ return (regprog_T *)prog;
+
+fail:
+ VIM_CLEAR(prog);
+#ifdef ENABLE_LOG
+ nfa_postfix_dump(expr, FAIL);
+#endif
+#ifdef DEBUG
+ nfa_regengine.expr = NULL;
+#endif
+ goto out;
+}
+
+/*
+ * Free a compiled regexp program, returned by nfa_regcomp().
+ */
+ static void
+nfa_regfree(regprog_T *prog)
+{
+ if (prog == NULL)
+ return;
+
+ vim_free(((nfa_regprog_T *)prog)->match_text);
+ vim_free(((nfa_regprog_T *)prog)->pattern);
+ vim_free(prog);
+}
+
+/*
+ * Match a regexp against a string.
+ * "rmp->regprog" is a compiled regexp as returned by nfa_regcomp().
+ * Uses curbuf for line count and 'iskeyword'.
+ * If "line_lbr" is TRUE consider a "\n" in "line" to be a line break.
+ *
+ * Returns <= 0 for failure, number of lines contained in the match otherwise.
+ */
+ static int
+nfa_regexec_nl(
+ regmatch_T *rmp,
+ char_u *line, // string to match against
+ colnr_T col, // column to start looking for match
+ int line_lbr)
+{
+ rex.reg_match = rmp;
+ rex.reg_mmatch = NULL;
+ rex.reg_maxline = 0;
+ rex.reg_line_lbr = line_lbr;
+ rex.reg_buf = curbuf;
+ rex.reg_win = NULL;
+ rex.reg_ic = rmp->rm_ic;
+ rex.reg_icombine = FALSE;
+ rex.reg_maxcol = 0;
+ return nfa_regexec_both(line, col, NULL);
+}
+
+
+/*
+ * 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 <= 0 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(
+ 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
+ int *timed_out) // flag set on timeout or NULL
+{
+ init_regexec_multi(rmp, win, buf, lnum);
+ return nfa_regexec_both(NULL, col, timed_out);
+}
+
+#ifdef DEBUG
+# undef ENABLE_LOG
+#endif
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-30 06:10:10 +0000