diff options
Diffstat (limited to 'src/regex.c')
| -rw-r--r-- | src/regex.c | 47 |
1 files changed, 28 insertions, 19 deletions
diff --git a/src/regex.c b/src/regex.c index fb829770c54..bd9ad6f6972 100644 --- a/src/regex.c +++ b/src/regex.c @@ -2855,22 +2855,25 @@ re_compile_fastmap (bufp) case anychar: - /* `.' matches anything ... */ - for (j = 0; j < (1 << BYTEWIDTH); j++) - fastmap[j] = 1; + { + int fastmap_newline = fastmap['\n']; - /* ... except perhaps newline. */ - if (!(bufp->syntax & RE_DOT_NEWLINE)) - fastmap['\n'] = 0; + /* `.' matches anything ... */ + for (j = 0; j < (1 << BYTEWIDTH); j++) + fastmap[j] = 1; - /* Return if we have already set `can_be_null'; if we have, - then the fastmap is irrelevant. Something's wrong here. */ - else if (bufp->can_be_null) - return 0; + /* ... except perhaps newline. */ + if (!(bufp->syntax & RE_DOT_NEWLINE)) + fastmap['\n'] = fastmap_newline; - /* Otherwise, have to check alternative paths. */ - break; + /* Return if we have already set `can_be_null'; if we have, + then the fastmap is irrelevant. Something's wrong here. */ + else if (bufp->can_be_null) + return 0; + /* Otherwise, have to check alternative paths. */ + break; + } #ifdef emacs case syntaxspec: @@ -3598,17 +3601,21 @@ re_match_2_internal (bufp, string1, size1, string2, size2, pos, regs, stop) longest match, try backtracking. */ if (d != end_match_2) { + /* 1 if this match ends in the same string (string1 or string2) + as the best previous match. */ + boolean same_str_p = (FIRST_STRING_P (match_end) + == MATCHING_IN_FIRST_STRING); + /* 1 if this match is the best seen so far. */ + boolean best_match_p = (same_str_p ? d > match_end + : !MATCHING_IN_FIRST_STRING); + DEBUG_PRINT1 ("backtracking.\n"); if (!FAIL_STACK_EMPTY ()) { /* More failure points to try. */ - boolean same_str_p = (FIRST_STRING_P (match_end) - == MATCHING_IN_FIRST_STRING); /* If exceeds best match so far, save it. */ - if (!best_regs_set - || (same_str_p && d > match_end) - || (!same_str_p && !MATCHING_IN_FIRST_STRING)) + if (!best_regs_set || best_match_p) { best_regs_set = true; match_end = d; @@ -3624,8 +3631,10 @@ re_match_2_internal (bufp, string1, size1, string2, size2, pos, regs, stop) goto fail; } - /* If no failure points, don't restore garbage. */ - else if (best_regs_set) + /* If no failure points, don't restore garbage. And if + last match is real best match, don't restore second + best one. */ + else if (best_regs_set && !best_match_p) { restore_best_regs: /* Restore best match. It may happen that `dend == |