diff options
Diffstat (limited to 'regcomp.c')
| -rw-r--r-- | regcomp.c | 57 |
1 files changed, 55 insertions, 2 deletions
@@ -418,6 +418,15 @@ static scan_data_t zero_scan_data = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, (int)offset, RExC_precomp, RExC_precomp + offset); \ } STMT_END +/* used for the parse_flags section for (?c) -- japhy */ +#define vWARN5(loc, m, a1, a2, a3, a4) \ + STMT_START { \ + unsigned offset = strlen(RExC_precomp)-(RExC_end-(loc)); \ + Perl_warner(aTHX_ WARN_REGEXP, m REPORT_LOCATION, \ + a1, a2, a3, a4, \ + (int)offset, RExC_precomp, RExC_precomp + offset); \ + } STMT_END + /* Allow for side effects in s */ #define REGC(c,s) STMT_START { if (!SIZE_ONLY) *(s) = (c); else (s);} STMT_END @@ -2018,12 +2027,23 @@ S_reg(pTHX_ RExC_state_t *pRExC_state, I32 paren, I32 *flagp) register regnode *ender = 0; register I32 parno = 0; I32 flags, oregflags = RExC_flags16, have_branch = 0, open = 0; + + /* for (?g), (?gc), and (?o) warnings; warning + about (?c) will warn about (?g) -- japhy */ + + I32 wastedflags = 0x00, + wasted_o = 0x01, + wasted_g = 0x02, + wasted_gc = 0x02 | 0x04, + wasted_c = 0x04; + char * parse_start = RExC_parse; /* MJD */ char *oregcomp_parse = RExC_parse; char c; *flagp = 0; /* Tentatively. */ + /* Make an OPEN node, if parenthesized. */ if (paren) { if (*RExC_parse == '?') { /* (?...) */ @@ -2202,12 +2222,45 @@ S_reg(pTHX_ RExC_state_t *pRExC_state, I32 paren, I32 *flagp) --RExC_parse; parse_flags: /* (?i) */ while (*RExC_parse && strchr("iogcmsx", *RExC_parse)) { - if (*RExC_parse != 'o') - pmflag(flagsp, *RExC_parse); + /* (?g), (?gc) and (?o) are useless here + and must be globally applied -- japhy */ + + if (*RExC_parse == 'o' || *RExC_parse == 'g') { + if (SIZE_ONLY && ckWARN(WARN_REGEXP)) { + I32 wflagbit = *RExC_parse == 'o' ? wasted_o : wasted_g; + if (! (wastedflags & wflagbit) ) { + wastedflags |= wflagbit; + vWARN5( + RExC_parse + 1, + "Useless (%s%c) - %suse /%c modifier", + flagsp == &negflags ? "?-" : "?", + *RExC_parse, + flagsp == &negflags ? "don't " : "", + *RExC_parse + ); + } + } + } + else if (*RExC_parse == 'c') { + if (SIZE_ONLY && ckWARN(WARN_REGEXP)) { + if (! (wastedflags & wasted_c) ) { + wastedflags |= wasted_gc; + vWARN3( + RExC_parse + 1, + "Useless (%sc) - %suse /gc modifier", + flagsp == &negflags ? "?-" : "?", + flagsp == &negflags ? "don't " : "" + ); + } + } + } + else { pmflag(flagsp, *RExC_parse); } + ++RExC_parse; } if (*RExC_parse == '-') { flagsp = &negflags; + wastedflags = 0; /* reset so (?g-c) warns twice */ ++RExC_parse; goto parse_flags; } |