package feature;
-our $VERSION = '1.47';
+our $VERSION = '1.61';
our %feature = (
- fc => 'feature_fc',
- say => 'feature_say',
- state => 'feature_state',
- switch => 'feature_switch',
- bitwise => 'feature_bitwise',
- evalbytes => 'feature_evalbytes',
- array_base => 'feature_arybase',
- signatures => 'feature_signatures',
- current_sub => 'feature___SUB__',
- refaliasing => 'feature_refaliasing',
- postderef_qq => 'feature_postderef_qq',
- unicode_eval => 'feature_unieval',
- declared_refs => 'feature_myref',
- unicode_strings => 'feature_unicode',
+ fc => 'feature_fc',
+ isa => 'feature_isa',
+ say => 'feature_say',
+ state => 'feature_state',
+ switch => 'feature_switch',
+ bitwise => 'feature_bitwise',
+ indirect => 'feature_indirect',
+ evalbytes => 'feature_evalbytes',
+ signatures => 'feature_signatures',
+ current_sub => 'feature___SUB__',
+ refaliasing => 'feature_refaliasing',
+ postderef_qq => 'feature_postderef_qq',
+ unicode_eval => 'feature_unieval',
+ declared_refs => 'feature_myref',
+ unicode_strings => 'feature_unicode',
+ multidimensional => 'feature_multidimensional',
);
our %feature_bundle = (
- "5.10" => [qw(array_base say state switch)],
- "5.11" => [qw(array_base say state switch unicode_strings)],
- "5.15" => [qw(current_sub evalbytes fc say state switch unicode_eval unicode_strings)],
- "5.23" => [qw(current_sub evalbytes fc postderef_qq say state switch unicode_eval unicode_strings)],
- "all" => [qw(array_base bitwise current_sub declared_refs evalbytes fc postderef_qq refaliasing say signatures state switch unicode_eval unicode_strings)],
- "default" => [qw(array_base)],
+ "5.10" => [qw(indirect multidimensional say state switch)],
+ "5.11" => [qw(indirect multidimensional say state switch unicode_strings)],
+ "5.15" => [qw(current_sub evalbytes fc indirect multidimensional say state switch unicode_eval unicode_strings)],
+ "5.23" => [qw(current_sub evalbytes fc indirect multidimensional postderef_qq say state switch unicode_eval unicode_strings)],
+ "5.27" => [qw(bitwise current_sub evalbytes fc indirect multidimensional postderef_qq say state switch unicode_eval unicode_strings)],
+ "all" => [qw(bitwise current_sub declared_refs evalbytes fc indirect isa multidimensional postderef_qq refaliasing say signatures state switch unicode_eval unicode_strings)],
+ "default" => [qw(indirect multidimensional)],
);
$feature_bundle{"5.12"} = $feature_bundle{"5.11"};
$feature_bundle{"5.24"} = $feature_bundle{"5.23"};
$feature_bundle{"5.25"} = $feature_bundle{"5.23"};
$feature_bundle{"5.26"} = $feature_bundle{"5.23"};
+$feature_bundle{"5.28"} = $feature_bundle{"5.27"};
+$feature_bundle{"5.29"} = $feature_bundle{"5.27"};
+$feature_bundle{"5.30"} = $feature_bundle{"5.27"};
+$feature_bundle{"5.31"} = $feature_bundle{"5.27"};
+$feature_bundle{"5.32"} = $feature_bundle{"5.27"};
+$feature_bundle{"5.33"} = $feature_bundle{"5.27"};
+$feature_bundle{"5.34"} = $feature_bundle{"5.27"};
$feature_bundle{"5.9.5"} = $feature_bundle{"5.10"};
my %noops = (
postderef => 1,
lexical_subs => 1,
);
+my %removed = (
+ array_base => 1,
+);
our $hint_shift = 26;
-our $hint_mask = 0x1c000000;
-our @hint_bundles = qw( default 5.10 5.11 5.15 5.23 );
+our $hint_mask = 0x3c000000;
+our @hint_bundles = qw( default 5.10 5.11 5.15 5.23 5.27 );
# This gets set (for now) in $^H as well as in %^H,
# for runtime speed of the uc/lc/ucfirst/lcfirst functions.
=head2 The 'say' feature
-C<use feature 'say'> tells the compiler to enable the Perl 6 style
+C<use feature 'say'> tells the compiler to enable the Raku-inspired
C<say> function.
See L<perlfunc/say> for details.
no warnings "experimental::smartmatch";
-C<use feature 'switch'> tells the compiler to enable the Perl 6
+C<use feature 'switch'> tells the compiler to enable the Raku
given/when construct.
See L<perlsyn/"Switch Statements"> for details.
This feature is available starting with Perl 5.12; was almost fully
implemented in Perl 5.14; and extended in Perl 5.16 to cover C<quotemeta>;
-and extended further in Perl 5.26 to cover L<the range
-operator|perlop/Range Operators>.
+was extended further in Perl 5.26 to cover L<the range
+operator|perlop/Range Operators>; and was extended again in Perl 5.28 to
+cover L<special-cased whitespace splitting|perlfunc/split>.
=head2 The 'unicode_eval' and 'evalbytes' features
=head2 The 'array_base' feature
-This feature supports the legacy C<$[> variable. See L<perlvar/$[> and
-L<arybase>. It is on by default but disabled under C<use v5.16> (see
-L</IMPLICIT LOADING>, below).
+This feature supported the legacy C<$[> variable. See L<perlvar/$[>.
+It was on by default but disabled under C<use v5.16> (see
+L</IMPLICIT LOADING>, below) and unavailable since perl 5.30.
This feature is available under this name starting with Perl 5.16. In
previous versions, it was simply on all the time, and this pragma knew
=head2 The 'bitwise' feature
-B<WARNING>: This feature is still experimental and the implementation may
-change in future versions of Perl. For this reason, Perl will
-warn when you use the feature, unless you have explicitly disabled the
-warning:
-
- no warnings "experimental::bitwise";
-
This makes the four standard bitwise operators (C<& | ^ ~>) treat their
operands consistently as numbers, and introduces four new dotted operators
(C<&. |. ^. ~.>) that treat their operands consistently as strings. The
See L<perlop/Bitwise String Operators> for details.
-This feature is available from Perl 5.22 onwards.
+This feature is available from Perl 5.22 onwards. Starting in Perl 5.28,
+C<use v5.28> will enable the feature. Before 5.28, it was still
+experimental and would emit a warning in the "experimental::bitwise"
+category.
=head2 The 'declared_refs' feature
This feature is available from Perl 5.26 onwards.
+=head2 The 'isa' feature
+
+This allows the use of the C<isa> infix operator, which tests whether the
+scalar given by the left operand is an object of the class given by the
+right operand. See L<perlop/Class Instance Operator> for more details.
+
+This feature is available from Perl 5.32 onwards.
+
+=head2 The 'indirect' feature
+
+This feature allows the use of L<indirect object
+syntax|perlobj/Indirect Object Syntax> for method calls, e.g. C<new
+Foo 1, 2;>. It is enabled by default, but can be turned off to
+disallow indirect object syntax.
+
+This feature is available under this name from Perl 5.32 onwards. In
+previous versions, it was simply on all the time. To disallow (or
+warn on) indirect object syntax on older Perls, see the L<indirect>
+CPAN module.
+
+=head2 The 'multidimensional' feature
+
+This feature enables multidimensional array emulation, a perl 4 (or
+earlier) feature that was used to emulate multidimensional arrays with
+hashes. This works by converting code like C<< $foo{$x, y} >> into
+C<< $foo{join($;, $x, $y} >>. It is enabled by default, but can be
+turned off to disable multidimensional array emulation.
+
+When this feature is disabled the syntax that is normally replaced
+will report a compilation error.
+
+This feature is available under this name from Perl 5.34 onwards. In
+previous versions, it was simply on all the time.
+
+You can use the L<multidimensional> module on CPAN to disable
+multidimensional array emulation for older versions of Perl.
+
=head1 FEATURE BUNDLES
It's possible to load multiple features together, using
bundle features included
--------- -----------------
- :default array_base
+ :default indirect multidimensional
+
+ :5.10 indirect multidimensional say state switch
- :5.10 say state switch array_base
+ :5.12 indirect multidimensional say state switch
+ unicode_strings
- :5.12 say state switch unicode_strings array_base
+ :5.14 indirect multidimensional say state switch
+ unicode_strings
- :5.14 say state switch unicode_strings array_base
+ :5.16 current_sub evalbytes fc indirect
+ multidimensional say state switch
+ unicode_eval unicode_strings
- :5.16 say state switch unicode_strings
- unicode_eval evalbytes current_sub fc
+ :5.18 current_sub evalbytes fc indirect
+ multidimensional say state switch
+ unicode_eval unicode_strings
- :5.18 say state switch unicode_strings
- unicode_eval evalbytes current_sub fc
+ :5.20 current_sub evalbytes fc indirect
+ multidimensional say state switch
+ unicode_eval unicode_strings
- :5.20 say state switch unicode_strings
- unicode_eval evalbytes current_sub fc
+ :5.22 current_sub evalbytes fc indirect
+ multidimensional say state switch
+ unicode_eval unicode_strings
- :5.22 say state switch unicode_strings
- unicode_eval evalbytes current_sub fc
+ :5.24 current_sub evalbytes fc indirect
+ multidimensional postderef_qq say state
+ switch unicode_eval unicode_strings
- :5.24 say state switch unicode_strings
- unicode_eval evalbytes current_sub fc
- postderef_qq
+ :5.26 current_sub evalbytes fc indirect
+ multidimensional postderef_qq say state
+ switch unicode_eval unicode_strings
- :5.26 say state switch unicode_strings
- unicode_eval evalbytes current_sub fc
- postderef_qq
+ :5.28 bitwise current_sub evalbytes fc indirect
+ multidimensional postderef_qq say state
+ switch unicode_eval unicode_strings
+
+ :5.30 bitwise current_sub evalbytes fc indirect
+ multidimensional postderef_qq say state
+ switch unicode_eval unicode_strings
+
+ :5.32 bitwise current_sub evalbytes fc indirect
+ multidimensional postderef_qq say state
+ switch unicode_eval unicode_strings
+
+ :5.34 bitwise current_sub evalbytes fc indirect
+ multidimensional postderef_qq say state
+ switch unicode_eval unicode_strings
The C<:default> bundle represents the feature set that is enabled before
any C<use feature> or C<no feature> declaration.
If the required version is older than Perl 5.10, the ":default" feature
bundle is automatically loaded instead.
+Unlike C<use feature ":5.12">, saying C<use v5.12> (or any higher version)
+also does the equivalent of C<use strict>; see L<perlfunc/use> for details.
+
=back
=cut
my $import = shift;
my $bundle_number = $^H & $hint_mask;
my $features = $bundle_number != $hint_mask
- && $feature_bundle{$hint_bundles[$bundle_number >> $hint_shift]};
+ && $feature_bundle{$hint_bundles[$bundle_number >> $hint_shift]};
if ($features) {
# Features are enabled implicitly via bundle hints.
# Delete any keys that may be left over from last time.
if (exists $noops{$name}) {
next;
}
+ if (!$import && exists $removed{$name}) {
+ next;
+ }
unknown_feature($name);
}
if ($import) {
https://perl5.git.perl.org / perl5.git / blobdiff