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gv.c - add ${^FORCE_UPGRADE} for triggering upgrade by concatenation #20459

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gv.c - add ${^FORCE_UPGRADE} for triggering upgrade by concatenation #20459

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10 changes: 10 additions & 0 deletions gv.c
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Expand Up @@ -2211,6 +2211,16 @@ S_gv_magicalize(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len,
if (memEQs(name, len, "\005NCODING"))
goto magicalize;
break;
case '\006':
if (memEQs(name, len, "\006ORCE_UPGRADE")) { /* ${^FORCE_UPGRADE} */
/* empty string which is marked as UTF8 on */
SV *sv= GvSVn(gv);
sv_setpvs(sv,"");
SvUTF8_on(sv);
SvREADONLY_on(sv);
}
break;

case '\007': /* $^GLOBAL_PHASE */
if (memEQs(name, len, "\007LOBAL_PHASE"))
goto ro_magicalize;
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9 changes: 8 additions & 1 deletion lib/utf8.pm
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Expand Up @@ -5,7 +5,7 @@ use warnings;

our $hint_bits = 0x00800000;

our $VERSION = '1.24';
our $VERSION = '1.25';
our $AUTOLOAD;

sub import {
Expand Down Expand Up @@ -133,6 +133,13 @@ For example:
$x =~ /ss/i; # matches
my $z = uc($x); # converts to "SS"

As of 5.37.6 there is also the global variable C<${^FORCE_UPGRADE}>
which contains an empty string which when concatenated with any other
string causes the result to be an upgraded string. This can be helpful
in some contexts where explicitly calling this function might be
awkward. A similar effect can also be produced by using a C<\N{U+...}>
style escape for one of the characters in the string.

B<Note that this function does not handle arbitrary encodings>;
use L<Encode> instead.

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5 changes: 5 additions & 0 deletions pod/perldelta.pod
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Expand Up @@ -27,6 +27,11 @@ here, but most should go in the L</Performance Enhancements> section.

[ List each enhancement as a =head2 entry ]

=head2 New global variable C<${^FORCE_UPGRADE}>

This variable contains the empty string, and can be used to force a string
or pattern to be upgraded via concatenation.

=head1 Security

XXX Any security-related notices go here. In particular, any security
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13 changes: 13 additions & 0 deletions pod/perlvar.pod
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Expand Up @@ -504,6 +504,19 @@ mode is turned on. See L<perlrun|perlrun/-a> for the B<-a> switch. This
array is package-specific, and must be declared or given a full package
name if not in package main when running under C<strict 'vars'>.

=item ${^FORCE_UPGRADE}

This contains an empty string which when concatenated with any other
string will cause the result to be an upgraded string. Eg:

print "ss"=~/\xDF/i ? "yes" : "no";
no

but

print "ss"=~/\xDF${^FORCE_UPGRADE}/i ? "yes" : "no";
yes

=item @INC
X<@INC>

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