On Mon, 8 Aug 2005 15:36:40 +0100, Nicholas Clark <nick(_at_)ccl4(_dot_)org>
wrote
On Thu, Aug 04, 2005 at 11:42:54AM +0530, Sastry wrote:
Hi
I am trying to run this script on an EBCDIC platform using perl-5.8.6
($a = "\x89\x8a\x8b\x8c\x8d\x8f\x90\x91") =~ tr/\x89-\x91/X/;
is($a, "XXXXXXXX");
The result I get is
'X«»ðý±°X'
a) Is this happening since \x8a\x8b\x8c\x8d\x8f\x90 are the gapped
characters in EBCDIC ?
I think so. In that \x89 is 'i' and \x91 is 'j'.
b) Should all the bytes in $a change to X?
I don't know. It seems to be some special case code in regexec.c:
#ifdef EBCDIC
/* In EBCDIC [\x89-\x91] should include
* the \x8e but [i-j] should not. */
if (literal_endpoint == 2 &&
((isLOWER(prevvalue) && isLOWER(ceilvalue)) ||
(isUPPER(prevvalue) && isUPPER(ceilvalue))))
{
if (isLOWER(prevvalue)) {
for (i = prevvalue; i <= ceilvalue; i++)
if (isLOWER(i))
ANYOF_BITMAP_SET(ret, i);
} else {
for (i = prevvalue; i <= ceilvalue; i++)
if (isUPPER(i))
ANYOF_BITMAP_SET(ret, i);
}
}
else
#endif
which I assume is making [i-j] in a regexp leave a gap, but [\x89-\x91] not.
I don't know where ranges in tr/// are parsed, but given that I grepped
for EBCDIC and didn't find any analogous code, it looks like tr/\x89-\x91//
is treated as tr/i-j// and in turn i-j is treated as letters and always
"special cased"
S_scan_const() in toke.c seems to expand ranges in tr///,
while S_regclass() in regcomp.c (what I assume you mean) copes
with those in [].
++++++++ from toke.c, line 1419
#ifdef EBCDIC
if ((isLOWER(min) && isLOWER(max)) ||
(isUPPER(min) && isUPPER(max))) {
if (isLOWER(min)) {
for (i = min; i <= max; i++)
if (isLOWER(i))
*d++ = NATIVE_TO_NEED(has_utf8,i);
} else {
for (i = min; i <= max; i++)
if (isUPPER(i))
*d++ = NATIVE_TO_NEED(has_utf8,i);
}
}
else
#endif
The former doesn't have thing like literal_endpoint in the latter;
thus tr/// seem not to tell literals from metacharacters in ranges
and tr/\x89-\x91/X/ will not replace \x8e in EBCDIC.
Hmm, it may be a possible inconsistency in the case of EBCDIC.
Sastry, would you please do the following codelet on your EBCDIC?
($a = "\x89\x8a\x8b\x8c\x8d\x8f\x90\x91") =~ s/[\x89-\x91]/X/g;
is($a, "XXXXXXXX");
Does that work similarly to yours?
($a = "\x89\x8a\x8b\x8c\x8d\x8f\x90\x91") =~ tr/\x89-\x91/X/;
is($a, "XXXXXXXX");
Regards,
SADAHIRO Tomoyuki
