# lib/feature.pm
# feature.h
#
-# from information hardcoded into this script.
+# from information hardcoded into this script and from two #defines
+# in perl.h.
#
# This script is normally invoked from regen.pl.
BEGIN {
- require 'regen/regen_lib.pl';
+ require './regen/regen_lib.pl';
push @INC, './lib';
}
use strict ;
say => 'say',
state => 'state',
switch => 'switch',
+ bitwise => 'bitwise',
evalbytes => 'evalbytes',
array_base => 'arybase',
current_sub => '__SUB__',
+ refaliasing => 'refaliasing',
+ postderef_qq => 'postderef_qq',
unicode_eval => 'unieval',
+ declared_refs => 'myref',
unicode_strings => 'unicode',
+ fc => 'fc',
+ signatures => 'signatures',
);
# NOTE: If a feature is ever enabled in a non-contiguous range of Perl
# versions, any code below that uses %BundleRanges will have to
# be changed to account.
+# 5.odd implies the next 5.even, but an explicit 5.even can override it.
my %feature_bundle = (
+ all => [ keys %feature ],
default => [qw(array_base)],
"5.9.5" => [qw(say state switch array_base)],
"5.10" => [qw(say state switch array_base)],
"5.11" => [qw(say state switch unicode_strings array_base)],
- "5.12" => [qw(say state switch unicode_strings array_base)],
"5.13" => [qw(say state switch unicode_strings array_base)],
- "5.14" => [qw(say state switch unicode_strings array_base)],
"5.15" => [qw(say state switch unicode_strings unicode_eval
- evalbytes current_sub)],
- "5.16" => [qw(say state switch unicode_strings unicode_eval
- evalbytes current_sub)],
+ evalbytes current_sub fc)],
+ "5.17" => [qw(say state switch unicode_strings unicode_eval
+ evalbytes current_sub fc)],
+ "5.19" => [qw(say state switch unicode_strings unicode_eval
+ evalbytes current_sub fc)],
+ "5.21" => [qw(say state switch unicode_strings unicode_eval
+ evalbytes current_sub fc)],
+ "5.23" => [qw(say state switch unicode_strings unicode_eval
+ evalbytes current_sub fc postderef_qq)],
+ "5.25" => [qw(say state switch unicode_strings unicode_eval
+ evalbytes current_sub fc postderef_qq)],
+ "5.27" => [qw(say state switch unicode_strings unicode_eval
+ evalbytes current_sub fc postderef_qq)],
);
+my @noops = qw( postderef lexical_subs );
+
###########################################################################
# More data generated from the above
+for (keys %feature_bundle) {
+ next unless /^5\.(\d*[13579])\z/;
+ $feature_bundle{"5.".($1+1)} ||= $feature_bundle{$_};
+}
+
my %UniqueBundles; # "say state switch" => 5.10
my %Aliases; # 5.12 => 5.11
for( sort keys %feature_bundle ) {
my $HintShift;
my $HintMask;
-
-open "perl.h", "perl.h" or die "$0 cannot open perl.h: $!";
-perlh: {
- while (readline "perl.h") {
- next unless /#define\s+HINT_FEATURE_MASK/;
- /(0x[A-Fa-f0-9]+)/ or die "No hex number in:\n\n$_\n ";
+my $Uni8Bit;
+
+open "perl.h", "<", "perl.h" or die "$0 cannot open perl.h: $!";
+while (readline "perl.h") {
+ next unless /#\s*define\s+(HINT_FEATURE_MASK|HINT_UNI_8_BIT)/;
+ my $is_u8b = $1 =~ 8;
+ /(0x[A-Fa-f0-9]+)/ or die "No hex number in:\n\n$_\n ";
+ if ($is_u8b) {
+ $Uni8Bit = $1;
+ }
+ else {
my $hex = $HintMask = $1;
my $bits = sprintf "%b", oct $1;
$bits =~ /^0*1+(0*)\z/
length sprintf "%b", scalar keys %UniqueBundles;
$bits =~ /1{$bits_needed}/
or die "Not enough bits (need $bits_needed)"
- . " in $bits (binary for $hex):\n\n$_\n";
- last perlh;
+ . " in $bits (binary for $hex):\n\n$_\n ";
}
- die "No HINT_FEATURE_MASK defined in perl.h";
+ if ($Uni8Bit && $HintMask) { last }
}
+die "No HINT_FEATURE_MASK defined in perl.h" unless $HintMask;
+die "No HINT_UNI_8_BIT defined in perl.h" unless $Uni8Bit;
+
close "perl.h";
my @HintedBundles =
$long;
}
-print $pm "my %feature = (\n";
+print $pm "our %feature = (\n";
my $width = length longest keys %feature;
-for(sort { length $a <=> length $b } keys %feature) {
+for(sort { length $a <=> length $b || $a cmp $b } keys %feature) {
print $pm " $_" . " "x($width-length)
. " => 'feature_$feature{$_}',\n";
}
qq'\$feature_bundle{"$_"} = \$feature_bundle{"$Aliases{$_}"};\n';
};
+print $pm "my \%noops = (\n";
+print $pm " $_ => 1,\n", for @noops;
+print $pm ");\n";
+
print $pm <<EOPM;
-my \$hint_shift = $HintShift;
-my \$hint_mask = $HintMask;
-my \@hint_bundles = qw( @HintedBundles );
+our \$hint_shift = $HintShift;
+our \$hint_mask = $HintMask;
+our \@hint_bundles = qw( @HintedBundles );
+
+# This gets set (for now) in \$^H as well as in %^H,
+# for runtime speed of the uc/lc/ucfirst/lcfirst functions.
+# See HINT_UNI_8_BIT in perl.h.
+our \$hint_uni8bit = $Uni8Bit;
EOPM
###########################################################################
# Generate feature.h
-my $first_bit = sprintf "0x%08x", 1 << $HintShift;
print $h <<EOH;
#if defined(PERL_CORE) || defined (PERL_EXT)
#define CURRENT_HINTS \
(PL_curcop == &PL_compiling ? PL_hints : PL_curcop->cop_hints)
-#define CURRENT_FEATURE_BUNDLE (CURRENT_HINTS >> HINT_FEATURE_SHIFT)
+#define CURRENT_FEATURE_BUNDLE \
+ ((CURRENT_HINTS & HINT_FEATURE_MASK) >> HINT_FEATURE_SHIFT)
+/* Avoid using ... && Perl_feature_is_enabled(...) as that triggers a bug in
+ the HP-UX cc on PA-RISC */
#define FEATURE_IS_ENABLED(name) \
- (((PL_curcop == &PL_compiling ? PL_hints : PL_curcop->cop_hints) \
+ ((CURRENT_HINTS \
& HINT_LOCALIZE_HH) \
- && Perl_feature_is_enabled(aTHX_ STR_WITH_LEN(name)))
+ ? Perl_feature_is_enabled(aTHX_ STR_WITH_LEN(name)) : FALSE)
/* The longest string we pass in. */
-#define MAX_FEATURE_LEN (sizeof("unicode_strings")-1)
-
EOH
+my $longest_internal_feature_name = longest values %feature;
+print $h <<EOL;
+#define MAX_FEATURE_LEN (sizeof("$longest_internal_feature_name")-1)
+
+EOL
+
for (
- sort { length $a <=> length $b } keys %feature
+ sort { length $a <=> length $b || $a cmp $b } keys %feature
) {
my($first,$last) =
map { (my $__ = uc) =~ y/.//d; $__ } @{$BundleRanges{$_}};
my $name = $feature{$_};
my $NAME = uc $name;
- if ($last && $first eq 'DEFAULT') { # ‘>= DEFAULT’ warns
+ if ($last && $first eq 'DEFAULT') { # '>= DEFAULT' warns
print $h <<EOI;
#define FEATURE_$NAME\_IS_ENABLED \\
( \\
EOH3
}
- else {
+ elsif ($first) {
print $h <<EOH4;
#define FEATURE_$NAME\_IS_ENABLED \\
( \\
EOH4
}
+ else {
+ print $h <<EOH5;
+#define FEATURE_$NAME\_IS_ENABLED \\
+ ( \\
+ CURRENT_FEATURE_BUNDLE == FEATURE_BUNDLE_CUSTOM && \\
+ FEATURE_IS_ENABLED("$name") \\
+ )
+
+EOH5
+ }
}
print $h <<EOH;
print $h <<EOJ;
FEATURE_BUNDLE_DEFAULT
) << HINT_FEATURE_SHIFT;
+ /* special case */
+ assert(PL_curcop == &PL_compiling);
+ if (FEATURE_UNICODE_IS_ENABLED) PL_hints |= HINT_UNI_8_BIT;
+ else PL_hints &= ~HINT_UNI_8_BIT;
}
#endif /* PERL_IN_OP_C */
EOJ
__END__
package feature;
-our $VERSION = '1.25';
+our $VERSION = '1.49';
FEATURES
-# This gets set (for now) in $^H as well as in %^H,
-# for runtime speed of the uc/lc/ucfirst/lcfirst functions.
-# See HINT_UNI_8_BIT in perl.h.
-our $hint_uni8bit = 0x00000800;
-
# TODO:
# - think about versioned features (use feature switch => 2)
=head2 Lexical effect
Like other pragmas (C<use strict>, for example), features have a lexical
-effect. C<use feature qw(foo)> will only make the feature "foo" available
+effect. C<use feature qw(foo)> will only make the feature "foo" available
from that point to the end of the enclosing block.
{
}
say "Yet it is here.";
-C<no feature> with no features specified will turn off all features.
+C<no feature> with no features specified will reset to the default group. To
+disable I<all> features (an unusual request!) use C<no feature ':all'>.
=head1 AVAILABLE FEATURES
=head2 The 'switch' feature
+B<WARNING>: Because the L<smartmatch operator|perlop/"Smartmatch Operator"> is
+experimental, Perl will warn when you use this feature, unless you have
+explicitly disabled the warning:
+
+ no warnings "experimental::smartmatch";
+
C<use feature 'switch'> tells the compiler to enable the Perl 6
given/when construct.
-See L<perlsyn/"Switch statements"> for details.
+See L<perlsyn/"Switch Statements"> for details.
This feature is available starting with Perl 5.10.
=head2 The 'unicode_strings' feature
-C<use feature 'unicode_strings'> tells the compiler to use Unicode semantics
+C<use feature 'unicode_strings'> tells the compiler to use Unicode rules
in all string operations executed within its scope (unless they are also
within the scope of either C<use locale> or C<use bytes>). The same applies
to all regular expressions compiled within the scope, even if executed outside
-it.
+it. It does not change the internal representation of strings, but only how
+they are interpreted.
C<no feature 'unicode_strings'> tells the compiler to use the traditional
-Perl semantics wherein the native character set semantics is used unless it is
+Perl rules wherein the native character set rules is used unless it is
clear to Perl that Unicode is desired. This can lead to some surprises
when the behavior suddenly changes. (See
L<perlunicode/The "Unicode Bug"> for details.) For this reason, if you are
potentially using Unicode in your program, the
C<use feature 'unicode_strings'> subpragma is B<strongly> recommended.
-This feature is available starting with Perl 5.12, but was not fully
-implemented until Perl 5.14.
+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>;
+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
-Under the C<unicode_eval> feature, Perl's C<eval> function, when passed a
-string, will evaluate it as a string of characters, ignoring any
-C<use utf8> declarations. C<use utf8> exists to declare the encoding of
-the script, which only makes sense for a stream of bytes, not a string of
-characters. Source filters are forbidden, as they also really only make
-sense on strings of bytes. Any attempt to activate a source filter will
-result in an error.
-
-The C<evalbytes> feature enables the C<evalbytes> keyword, which evaluates
-the argument passed to it as a string of bytes. It dies if the string
-contains any characters outside the 8-bit range. Source filters work
-within C<evalbytes>: they apply to the contents of the string being
-evaluated.
-
-Together, these two features are intended to replace the historical C<eval>
-function, which has (at least) two bugs in it, that cannot easily be fixed
-without breaking existing programs:
-
-=over
-
-=item *
-
-C<eval> behaves differently depending on the internal encoding of the
-string, sometimes treating its argument as a string of bytes, and sometimes
-as a string of characters.
-
-=item *
-
-Source filters activated within C<eval> leak out into whichever I<file>
-scope is currently being compiled. To give an example with the CPAN module
-L<Semi::Semicolons>:
+Together, these two features are intended to replace the legacy string
+C<eval> function, which behaves problematically in some instances. They are
+available starting with Perl 5.16, and are enabled by default by a
+S<C<use 5.16>> or higher declaration.
- BEGIN { eval "use Semi::Semicolons; # not filtered here " }
- # filtered here!
-
-C<evalbytes> fixes that to work the way one would expect:
-
- use feature "evalbytes";
- BEGIN { evalbytes "use Semi::Semicolons; # filtered " }
- # not filtered
-
-=back
+C<unicode_eval> changes the behavior of plain string C<eval> to work more
+consistently, especially in the Unicode world. Certain (mis)behaviors
+couldn't be changed without breaking some things that had come to rely on
+them, so the feature can be enabled and disabled. Details are at
+L<perlfunc/Under the "unicode_eval" feature>.
-These two features are available starting with Perl 5.16.
+C<evalbytes> is like string C<eval>, but operating on a byte stream that is
+not UTF-8 encoded. Details are at L<perlfunc/evalbytes EXPR>. Without a
+S<C<use feature 'evalbytes'>> nor a S<C<use v5.16>> (or higher) declaration in
+the current scope, you can still access it by instead writing
+C<CORE::evalbytes>.
=head2 The 'current_sub' feature
previous versions, it was simply on all the time, and this pragma knew
nothing about it.
+=head2 The 'fc' feature
+
+C<use feature 'fc'> tells the compiler to enable the C<fc> function,
+which implements Unicode casefolding.
+
+See L<perlfunc/fc> for details.
+
+This feature is available from Perl 5.16 onwards.
+
+=head2 The 'lexical_subs' feature
+
+In Perl versions prior to 5.26, this feature enabled
+declaration of subroutines via C<my sub foo>, C<state sub foo>
+and C<our sub foo> syntax. See L<perlsub/Lexical Subroutines> for details.
+
+This feature is available from Perl 5.18 onwards. From Perl 5.18 to 5.24,
+it was classed as experimental, and Perl emitted a warning for its
+usage, except when explicitly disabled:
+
+ no warnings "experimental::lexical_subs";
+
+As of Perl 5.26, use of this feature no longer triggers a warning, though
+the C<experimental::lexical_subs> warning category still exists (for
+compatibility with code that disables it). In addition, this syntax is
+not only no longer experimental, but it is enabled for all Perl code,
+regardless of what feature declarations are in scope.
+
+=head2 The 'postderef' and 'postderef_qq' features
+
+The 'postderef_qq' feature extends the applicability of L<postfix
+dereference syntax|perlref/Postfix Dereference Syntax> so that postfix array
+and scalar dereference are available in double-quotish interpolations. For
+example, it makes the following two statements equivalent:
+
+ my $s = "[@{ $h->{a} }]";
+ my $s = "[$h->{a}->@*]";
+
+This feature is available from Perl 5.20 onwards. In Perl 5.20 and 5.22, it
+was classed as experimental, and Perl emitted a warning for its
+usage, except when explicitly disabled:
+
+ no warnings "experimental::postderef";
+
+As of Perl 5.24, use of this feature no longer triggers a warning, though
+the C<experimental::postderef> warning category still exists (for
+compatibility with code that disables it).
+
+The 'postderef' feature was used in Perl 5.20 and Perl 5.22 to enable
+postfix dereference syntax outside double-quotish interpolations. In those
+versions, using it triggered the C<experimental::postderef> warning in the
+same way as the 'postderef_qq' feature did. As of Perl 5.24, this syntax is
+not only no longer experimental, but it is enabled for all Perl code,
+regardless of what feature declarations are in scope.
+
+=head2 The 'signatures' 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::signatures";
+
+This enables unpacking of subroutine arguments into lexical variables
+by syntax such as
+
+ sub foo ($left, $right) {
+ return $left + $right;
+ }
+
+See L<perlsub/Signatures> for details.
+
+This feature is available from Perl 5.20 onwards.
+
+=head2 The 'refaliasing' 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::refaliasing";
+
+This enables aliasing via assignment to references:
+
+ \$a = \$b; # $a and $b now point to the same scalar
+ \@a = \@b; # to the same array
+ \%a = \%b;
+ \&a = \&b;
+ foreach \%hash (@array_of_hash_refs) {
+ ...
+ }
+
+See L<perlref/Assigning to References> for details.
+
+This feature is available from Perl 5.22 onwards.
+
+=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
+same applies to the assignment variants (C<&= |= ^= &.= |.= ^.=>).
+
+See L<perlop/Bitwise String Operators> for details.
+
+This feature is available from Perl 5.22 onwards.
+
+=head2 The 'declared_refs' 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::declared_refs";
+
+This allows a reference to a variable to be declared with C<my>, C<state>,
+our C<our>, or localized with C<local>. It is intended mainly for use in
+conjunction with the "refaliasing" feature. See L<perlref/Declaring a
+Reference to a Variable> for examples.
+
+This feature is available from Perl 5.26 onwards.
+
=head1 FEATURE BUNDLES
It's possible to load multiple features together, using
will do an implicit
- no feature;
+ no feature ':all';
use feature ':5.10';
and so on. Note how the trailing sub-version
=cut
-sub current_bundle {
- my $bundle_number = $^H & $hint_mask;
- return if $bundle_number == $hint_mask;
- return $feature_bundle{@hint_bundles[$bundle_number >> $hint_shift]};
-}
-
sub import {
- my $class = shift;
- if (@_ == 0) {
+ shift;
+
+ if (!@_) {
croak("No features specified");
}
- if (my $features = current_bundle) {
- # Features are enabled implicitly via bundle hints.
- # Delete any keys that may be left over from last time.
- delete @^H{ values(%feature) };
-
- unshift @_, @$features;
- $^H |= $hint_mask;
- }
- while (@_) {
- my $name = shift(@_);
- if (substr($name, 0, 1) eq ":") {
- my $v = substr($name, 1);
- if (!exists $feature_bundle{$v}) {
- $v =~ s/^([0-9]+)\.([0-9]+).[0-9]+$/$1.$2/;
- if (!exists $feature_bundle{$v}) {
- unknown_feature_bundle(substr($name, 1));
- }
- }
- unshift @_, @{$feature_bundle{$v}};
- next;
- }
- if (!exists $feature{$name}) {
- unknown_feature($name);
- }
- $^H{$feature{$name}} = 1;
- $^H |= $hint_uni8bit if $name eq 'unicode_strings';
- }
+ __common(1, @_);
}
sub unimport {
- my $class = shift;
+ shift;
- if (my $features = current_bundle) {
- # Features are enabled implicitly via bundle hints
- # Pass them to import() to put them in a form we can handle.
- import(undef, @$features);
- $^H |= $hint_mask;
- }
-
- # A bare C<no feature> should disable *all* features
+ # A bare C<no feature> should reset to the default bundle
if (!@_) {
- delete @^H{ values(%feature) };
- $^H &= ~ $hint_uni8bit;
- return;
+ $^H &= ~($hint_uni8bit|$hint_mask);
+ return;
}
+ __common(0, @_);
+}
+
+
+sub __common {
+ my $import = shift;
+ my $bundle_number = $^H & $hint_mask;
+ my $features = $bundle_number != $hint_mask
+ && $feature_bundle{$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.
+ delete @^H{ values(%feature) };
+ $^H |= $hint_mask;
+ for (@$features) {
+ $^H{$feature{$_}} = 1;
+ $^H |= $hint_uni8bit if $_ eq 'unicode_strings';
+ }
+ }
while (@_) {
my $name = shift;
if (substr($name, 0, 1) eq ":") {
unshift @_, @{$feature_bundle{$v}};
next;
}
- if (!exists($feature{$name})) {
+ if (!exists $feature{$name}) {
+ if (exists $noops{$name}) {
+ next;
+ }
unknown_feature($name);
}
- else {
+ if ($import) {
+ $^H{$feature{$name}} = 1;
+ $^H |= $hint_uni8bit if $name eq 'unicode_strings';
+ } else {
delete $^H{$feature{$name}};
$^H &= ~ $hint_uni8bit if $name eq 'unicode_strings';
}
https://perl5.git.perl.org / perl5.git / blobdiff