diff options
Diffstat (limited to 'utf8.c')
| -rw-r--r-- | utf8.c | 65 |
1 files changed, 65 insertions, 0 deletions
@@ -2713,6 +2713,71 @@ Perl__swash_inversion_hash(pTHX_ SV* swash) return ret; } +HV* +Perl__swash_to_invlist(pTHX_ SV* const swash) +{ + + /* Subject to change or removal. For use only in one place in regcomp.c */ + + U8 *l, *lend; + char *loc; + STRLEN lcur; + HV *const hv = MUTABLE_HV(SvRV(swash)); + UV elements = 0; /* Number of elements in the inversion list */ + + /* The string containing the main body of the table */ + SV** const listsvp = hv_fetchs(hv, "LIST", FALSE); + SV** const typesvp = hv_fetchs(hv, "TYPE", FALSE); + SV** const bitssvp = hv_fetchs(hv, "BITS", FALSE); + + const U8* const typestr = (U8*)SvPV_nolen(*typesvp); + const STRLEN bits = SvUV(*bitssvp); + const STRLEN octets = bits >> 3; /* if bits == 1, then octets == 0 */ + + HV* invlist; + + PERL_ARGS_ASSERT__SWASH_TO_INVLIST; + + /* read $swash->{LIST} */ + l = (U8*)SvPV(*listsvp, lcur); + loc = (char *) l; + lend = l + lcur; + + /* Scan the input to count the number of lines to preallocate array size + * based on worst possible case, which is each line in the input creates 2 + * elements in the inversion list: 1) the beginning of a range in the list; + * 2) the beginning of a range not in the list. */ + while ((loc = (strchr(loc, '\n'))) != NULL) { + elements += 2; + loc++; + } + + /* If the ending is somehow corrupt and isn't a new line, add another + * element for the final range that isn't in the inversion list */ + if (! (*lend == '\n' || (*lend == '\0' && *(lend - 1) == '\n'))) { + elements++; + } + + invlist = _new_invlist(elements); + + /* Now go through the input again, adding each range to the list */ + while (l < lend) { + UV start, end; + UV val; /* Not used by this function */ + + l = S_swash_scan_list_line(aTHX_ l, lend, &start, &end, &val, + cBOOL(octets), typestr); + + if (l > lend) { + break; + } + + _append_range_to_invlist(invlist, start, end); + } + + return invlist; +} + /* =for apidoc uvchr_to_utf8 |