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Tidy comments about UTF case-independence.

This commit is contained in:
Philip.Hazel 2017-04-20 16:51:36 +00:00
parent b59f00fa14
commit b3a6fd38b8
1 changed files with 13 additions and 20 deletions
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33
src/pcre2_match.c
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@ -929,7 +929,9 @@ fprintf(stderr, "++ op=%d\n", *Fecode);
/* ===================================================================== */
/* Match a single character, caselessly. If we are at the end of the
subject, give up immediately. */
subject, give up immediately. We get here only when the pattern character
has at most one other case. Characters with more than two cases are coded
as OP_PROP with the pseudo-property PT_CLIST. */
case OP_CHARI:
if (Feptr >= mb->end_subject)
@ -945,10 +947,10 @@ fprintf(stderr, "++ op=%d\n", *Fecode);
Fecode++;
GETCHARLEN(fc, Fecode, Flength);
/* If the pattern character's value is < 128, we have only one byte, and
we know that its other case must also be one byte long, so we can use the
fast lookup table. We know that there is at least one byte left in the
subject. */
/* If the pattern character's value is < 128, we know that its other case
(if any) is also < 128 (and therefore only one code unit long in all
code-unit widths), so we can use the fast lookup table. We checked above
that there is at least one character left in the subject. */
if (fc < 128)
{
@ -958,32 +960,23 @@ fprintf(stderr, "++ op=%d\n", *Fecode);
Feptr++;
}
/* Otherwise we must pick up the subject character. Note that we cannot
use the value of "Flength" to check for sufficient bytes left, because the
other case of the character may have more or fewer bytes. */
/* Otherwise we must pick up the subject character and use Unicode
property support to test its other case. Note that we cannot use the
value of "Flength" to check for sufficient bytes left, because the other
case of the character may have more or fewer code units. */
else
{
uint32_t dc;
GETCHARINC(dc, Feptr);
Fecode += Flength;
/* If we have Unicode property support, we can use it to test the other
case of the character, if there is one. */
if (fc != dc)
{
#ifdef SUPPORT_UNICODE
if (dc != UCD_OTHERCASE(fc))
#endif
RRETURN(MATCH_NOMATCH);
}
if (dc != fc && dc != UCD_OTHERCASE(fc)) RRETURN(MATCH_NOMATCH);
}
}
else
#endif /* SUPPORT_UNICODE */
/* Not UTF mode */
/* Not UTF mode; use the table for characters < 256. */
{
if (TABLE_GET(Fecode[1], mb->lcc, Fecode[1])
!= TABLE_GET(*Feptr, mb->lcc, *Feptr)) RRETURN(MATCH_NOMATCH);