| Filename | /home/s1/perl5/perlbrew/perls/perl-5.22.0/lib/5.22.0/feature.pm |
| Statements | Executed 86 statements in 119µs |
| Calls | P | F | Exclusive Time |
Inclusive Time |
Subroutine |
|---|---|---|---|---|---|
| 1 | 1 | 1 | 66µs | 66µs | feature::__common |
| 1 | 1 | 1 | 17µs | 83µs | feature::import |
| 0 | 0 | 0 | 0s | 0s | feature::croak |
| 0 | 0 | 0 | 0s | 0s | feature::unimport |
| 0 | 0 | 0 | 0s | 0s | feature::unknown_feature |
| 0 | 0 | 0 | 0s | 0s | feature::unknown_feature_bundle |
| Line | State ments |
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Calls | Time in subs |
Code |
|---|---|---|---|---|---|
| 1 | # -*- buffer-read-only: t -*- | ||||
| 2 | # !!!!!!! DO NOT EDIT THIS FILE !!!!!!! | ||||
| 3 | # This file is built by regen/feature.pl. | ||||
| 4 | # Any changes made here will be lost! | ||||
| 5 | |||||
| 6 | package feature; | ||||
| 7 | |||||
| 8 | 1 | 700ns | our $VERSION = '1.40'; | ||
| 9 | |||||
| 10 | 1 | 8µs | our %feature = ( | ||
| 11 | fc => 'feature_fc', | ||||
| 12 | say => 'feature_say', | ||||
| 13 | state => 'feature_state', | ||||
| 14 | switch => 'feature_switch', | ||||
| 15 | bitwise => 'feature_bitwise', | ||||
| 16 | evalbytes => 'feature_evalbytes', | ||||
| 17 | postderef => 'feature_postderef', | ||||
| 18 | array_base => 'feature_arybase', | ||||
| 19 | signatures => 'feature_signatures', | ||||
| 20 | current_sub => 'feature___SUB__', | ||||
| 21 | refaliasing => 'feature_refaliasing', | ||||
| 22 | lexical_subs => 'feature_lexsubs', | ||||
| 23 | postderef_qq => 'feature_postderef_qq', | ||||
| 24 | unicode_eval => 'feature_unieval', | ||||
| 25 | unicode_strings => 'feature_unicode', | ||||
| 26 | ); | ||||
| 27 | |||||
| 28 | 1 | 6µs | our %feature_bundle = ( | ||
| 29 | "5.10" => [qw(array_base say state switch)], | ||||
| 30 | "5.11" => [qw(array_base say state switch unicode_strings)], | ||||
| 31 | "5.15" => [qw(current_sub evalbytes fc say state switch unicode_eval unicode_strings)], | ||||
| 32 | "all" => [qw(array_base bitwise current_sub evalbytes fc lexical_subs postderef postderef_qq refaliasing say signatures state switch unicode_eval unicode_strings)], | ||||
| 33 | "default" => [qw(array_base)], | ||||
| 34 | ); | ||||
| 35 | |||||
| 36 | 1 | 1µs | $feature_bundle{"5.12"} = $feature_bundle{"5.11"}; | ||
| 37 | 1 | 200ns | $feature_bundle{"5.13"} = $feature_bundle{"5.11"}; | ||
| 38 | 1 | 600ns | $feature_bundle{"5.14"} = $feature_bundle{"5.11"}; | ||
| 39 | 1 | 200ns | $feature_bundle{"5.16"} = $feature_bundle{"5.15"}; | ||
| 40 | 1 | 200ns | $feature_bundle{"5.17"} = $feature_bundle{"5.15"}; | ||
| 41 | 1 | 200ns | $feature_bundle{"5.18"} = $feature_bundle{"5.15"}; | ||
| 42 | 1 | 200ns | $feature_bundle{"5.19"} = $feature_bundle{"5.15"}; | ||
| 43 | 1 | 200ns | $feature_bundle{"5.20"} = $feature_bundle{"5.15"}; | ||
| 44 | 1 | 200ns | $feature_bundle{"5.21"} = $feature_bundle{"5.15"}; | ||
| 45 | 1 | 300ns | $feature_bundle{"5.22"} = $feature_bundle{"5.15"}; | ||
| 46 | 1 | 700ns | $feature_bundle{"5.9.5"} = $feature_bundle{"5.10"}; | ||
| 47 | |||||
| 48 | 1 | 300ns | our $hint_shift = 26; | ||
| 49 | 1 | 200ns | our $hint_mask = 0x1c000000; | ||
| 50 | 1 | 1µs | our @hint_bundles = qw( default 5.10 5.11 5.15 ); | ||
| 51 | |||||
| 52 | # This gets set (for now) in $^H as well as in %^H, | ||||
| 53 | # for runtime speed of the uc/lc/ucfirst/lcfirst functions. | ||||
| 54 | # See HINT_UNI_8_BIT in perl.h. | ||||
| 55 | 1 | 200ns | our $hint_uni8bit = 0x00000800; | ||
| 56 | |||||
| 57 | # TODO: | ||||
| 58 | # - think about versioned features (use feature switch => 2) | ||||
| 59 | |||||
| 60 | =head1 NAME | ||||
| 61 | |||||
| 62 | feature - Perl pragma to enable new features | ||||
| 63 | |||||
| 64 | =head1 SYNOPSIS | ||||
| 65 | |||||
| 66 | use feature qw(say switch); | ||||
| 67 | given ($foo) { | ||||
| 68 | when (1) { say "\$foo == 1" } | ||||
| 69 | when ([2,3]) { say "\$foo == 2 || \$foo == 3" } | ||||
| 70 | when (/^a[bc]d$/) { say "\$foo eq 'abd' || \$foo eq 'acd'" } | ||||
| 71 | when ($_ > 100) { say "\$foo > 100" } | ||||
| 72 | default { say "None of the above" } | ||||
| 73 | } | ||||
| 74 | |||||
| 75 | use feature ':5.10'; # loads all features available in perl 5.10 | ||||
| 76 | |||||
| 77 | use v5.10; # implicitly loads :5.10 feature bundle | ||||
| 78 | |||||
| 79 | =head1 DESCRIPTION | ||||
| 80 | |||||
| 81 | It is usually impossible to add new syntax to Perl without breaking | ||||
| 82 | some existing programs. This pragma provides a way to minimize that | ||||
| 83 | risk. New syntactic constructs, or new semantic meanings to older | ||||
| 84 | constructs, can be enabled by C<use feature 'foo'>, and will be parsed | ||||
| 85 | only when the appropriate feature pragma is in scope. (Nevertheless, the | ||||
| 86 | C<CORE::> prefix provides access to all Perl keywords, regardless of this | ||||
| 87 | pragma.) | ||||
| 88 | |||||
| 89 | =head2 Lexical effect | ||||
| 90 | |||||
| 91 | Like other pragmas (C<use strict>, for example), features have a lexical | ||||
| 92 | effect. C<use feature qw(foo)> will only make the feature "foo" available | ||||
| 93 | from that point to the end of the enclosing block. | ||||
| 94 | |||||
| 95 | { | ||||
| 96 | use feature 'say'; | ||||
| 97 | say "say is available here"; | ||||
| 98 | } | ||||
| 99 | print "But not here.\n"; | ||||
| 100 | |||||
| 101 | =head2 C<no feature> | ||||
| 102 | |||||
| 103 | Features can also be turned off by using C<no feature "foo">. This too | ||||
| 104 | has lexical effect. | ||||
| 105 | |||||
| 106 | use feature 'say'; | ||||
| 107 | say "say is available here"; | ||||
| 108 | { | ||||
| 109 | no feature 'say'; | ||||
| 110 | print "But not here.\n"; | ||||
| 111 | } | ||||
| 112 | say "Yet it is here."; | ||||
| 113 | |||||
| 114 | C<no feature> with no features specified will reset to the default group. To | ||||
| 115 | disable I<all> features (an unusual request!) use C<no feature ':all'>. | ||||
| 116 | |||||
| 117 | =head1 AVAILABLE FEATURES | ||||
| 118 | |||||
| 119 | =head2 The 'say' feature | ||||
| 120 | |||||
| 121 | C<use feature 'say'> tells the compiler to enable the Perl 6 style | ||||
| 122 | C<say> function. | ||||
| 123 | |||||
| 124 | See L<perlfunc/say> for details. | ||||
| 125 | |||||
| 126 | This feature is available starting with Perl 5.10. | ||||
| 127 | |||||
| 128 | =head2 The 'state' feature | ||||
| 129 | |||||
| 130 | C<use feature 'state'> tells the compiler to enable C<state> | ||||
| 131 | variables. | ||||
| 132 | |||||
| 133 | See L<perlsub/"Persistent Private Variables"> for details. | ||||
| 134 | |||||
| 135 | This feature is available starting with Perl 5.10. | ||||
| 136 | |||||
| 137 | =head2 The 'switch' feature | ||||
| 138 | |||||
| 139 | B<WARNING>: Because the L<smartmatch operator|perlop/"Smartmatch Operator"> is | ||||
| 140 | experimental, Perl will warn when you use this feature, unless you have | ||||
| 141 | explicitly disabled the warning: | ||||
| 142 | |||||
| 143 | no warnings "experimental::smartmatch"; | ||||
| 144 | |||||
| 145 | C<use feature 'switch'> tells the compiler to enable the Perl 6 | ||||
| 146 | given/when construct. | ||||
| 147 | |||||
| 148 | See L<perlsyn/"Switch Statements"> for details. | ||||
| 149 | |||||
| 150 | This feature is available starting with Perl 5.10. | ||||
| 151 | |||||
| 152 | =head2 The 'unicode_strings' feature | ||||
| 153 | |||||
| 154 | C<use feature 'unicode_strings'> tells the compiler to use Unicode rules | ||||
| 155 | in all string operations executed within its scope (unless they are also | ||||
| 156 | within the scope of either C<use locale> or C<use bytes>). The same applies | ||||
| 157 | to all regular expressions compiled within the scope, even if executed outside | ||||
| 158 | it. It does not change the internal representation of strings, but only how | ||||
| 159 | they are interpreted. | ||||
| 160 | |||||
| 161 | C<no feature 'unicode_strings'> tells the compiler to use the traditional | ||||
| 162 | Perl rules wherein the native character set rules is used unless it is | ||||
| 163 | clear to Perl that Unicode is desired. This can lead to some surprises | ||||
| 164 | when the behavior suddenly changes. (See | ||||
| 165 | L<perlunicode/The "Unicode Bug"> for details.) For this reason, if you are | ||||
| 166 | potentially using Unicode in your program, the | ||||
| 167 | C<use feature 'unicode_strings'> subpragma is B<strongly> recommended. | ||||
| 168 | |||||
| 169 | This feature is available starting with Perl 5.12; was almost fully | ||||
| 170 | implemented in Perl 5.14; and extended in Perl 5.16 to cover C<quotemeta>. | ||||
| 171 | |||||
| 172 | =head2 The 'unicode_eval' and 'evalbytes' features | ||||
| 173 | |||||
| 174 | Under the C<unicode_eval> feature, Perl's C<eval> function, when passed a | ||||
| 175 | string, will evaluate it as a string of characters, ignoring any | ||||
| 176 | C<use utf8> declarations. C<use utf8> exists to declare the encoding of | ||||
| 177 | the script, which only makes sense for a stream of bytes, not a string of | ||||
| 178 | characters. Source filters are forbidden, as they also really only make | ||||
| 179 | sense on strings of bytes. Any attempt to activate a source filter will | ||||
| 180 | result in an error. | ||||
| 181 | |||||
| 182 | The C<evalbytes> feature enables the C<evalbytes> keyword, which evaluates | ||||
| 183 | the argument passed to it as a string of bytes. It dies if the string | ||||
| 184 | contains any characters outside the 8-bit range. Source filters work | ||||
| 185 | within C<evalbytes>: they apply to the contents of the string being | ||||
| 186 | evaluated. | ||||
| 187 | |||||
| 188 | Together, these two features are intended to replace the historical C<eval> | ||||
| 189 | function, which has (at least) two bugs in it, that cannot easily be fixed | ||||
| 190 | without breaking existing programs: | ||||
| 191 | |||||
| 192 | =over | ||||
| 193 | |||||
| 194 | =item * | ||||
| 195 | |||||
| 196 | C<eval> behaves differently depending on the internal encoding of the | ||||
| 197 | string, sometimes treating its argument as a string of bytes, and sometimes | ||||
| 198 | as a string of characters. | ||||
| 199 | |||||
| 200 | =item * | ||||
| 201 | |||||
| 202 | Source filters activated within C<eval> leak out into whichever I<file> | ||||
| 203 | scope is currently being compiled. To give an example with the CPAN module | ||||
| 204 | L<Semi::Semicolons>: | ||||
| 205 | |||||
| 206 | BEGIN { eval "use Semi::Semicolons; # not filtered here " } | ||||
| 207 | # filtered here! | ||||
| 208 | |||||
| 209 | C<evalbytes> fixes that to work the way one would expect: | ||||
| 210 | |||||
| 211 | use feature "evalbytes"; | ||||
| 212 | BEGIN { evalbytes "use Semi::Semicolons; # filtered " } | ||||
| 213 | # not filtered | ||||
| 214 | |||||
| 215 | =back | ||||
| 216 | |||||
| 217 | These two features are available starting with Perl 5.16. | ||||
| 218 | |||||
| 219 | =head2 The 'current_sub' feature | ||||
| 220 | |||||
| 221 | This provides the C<__SUB__> token that returns a reference to the current | ||||
| 222 | subroutine or C<undef> outside of a subroutine. | ||||
| 223 | |||||
| 224 | This feature is available starting with Perl 5.16. | ||||
| 225 | |||||
| 226 | =head2 The 'array_base' feature | ||||
| 227 | |||||
| 228 | This feature supports the legacy C<$[> variable. See L<perlvar/$[> and | ||||
| 229 | L<arybase>. It is on by default but disabled under C<use v5.16> (see | ||||
| 230 | L</IMPLICIT LOADING>, below). | ||||
| 231 | |||||
| 232 | This feature is available under this name starting with Perl 5.16. In | ||||
| 233 | previous versions, it was simply on all the time, and this pragma knew | ||||
| 234 | nothing about it. | ||||
| 235 | |||||
| 236 | =head2 The 'fc' feature | ||||
| 237 | |||||
| 238 | C<use feature 'fc'> tells the compiler to enable the C<fc> function, | ||||
| 239 | which implements Unicode casefolding. | ||||
| 240 | |||||
| 241 | See L<perlfunc/fc> for details. | ||||
| 242 | |||||
| 243 | This feature is available from Perl 5.16 onwards. | ||||
| 244 | |||||
| 245 | =head2 The 'lexical_subs' feature | ||||
| 246 | |||||
| 247 | B<WARNING>: This feature is still experimental and the implementation may | ||||
| 248 | change in future versions of Perl. For this reason, Perl will | ||||
| 249 | warn when you use the feature, unless you have explicitly disabled the | ||||
| 250 | warning: | ||||
| 251 | |||||
| 252 | no warnings "experimental::lexical_subs"; | ||||
| 253 | |||||
| 254 | This enables declaration of subroutines via C<my sub foo>, C<state sub foo> | ||||
| 255 | and C<our sub foo> syntax. See L<perlsub/Lexical Subroutines> for details. | ||||
| 256 | |||||
| 257 | This feature is available from Perl 5.18 onwards. | ||||
| 258 | |||||
| 259 | =head2 The 'postderef' and 'postderef_qq' features | ||||
| 260 | |||||
| 261 | B<WARNING>: This feature is still experimental and the implementation may | ||||
| 262 | change in future versions of Perl. For this reason, Perl will | ||||
| 263 | warn when you use the feature, unless you have explicitly disabled the | ||||
| 264 | warning: | ||||
| 265 | |||||
| 266 | no warnings "experimental::postderef"; | ||||
| 267 | |||||
| 268 | The 'postderef' feature allows the use of L<postfix dereference | ||||
| 269 | syntax|perlref/Postfix Dereference Syntax>. For example, it will make the | ||||
| 270 | following two statements equivalent: | ||||
| 271 | |||||
| 272 | my @x = @{ $h->{a} }; | ||||
| 273 | my @x = $h->{a}->@*; | ||||
| 274 | |||||
| 275 | The 'postderef_qq' feature extends this, for array and scalar dereference, to | ||||
| 276 | working inside of double-quotish interpolations. | ||||
| 277 | |||||
| 278 | This feature is available from Perl 5.20 onwards. | ||||
| 279 | |||||
| 280 | =head2 The 'signatures' feature | ||||
| 281 | |||||
| 282 | B<WARNING>: This feature is still experimental and the implementation may | ||||
| 283 | change in future versions of Perl. For this reason, Perl will | ||||
| 284 | warn when you use the feature, unless you have explicitly disabled the | ||||
| 285 | warning: | ||||
| 286 | |||||
| 287 | no warnings "experimental::signatures"; | ||||
| 288 | |||||
| 289 | This enables unpacking of subroutine arguments into lexical variables | ||||
| 290 | by syntax such as | ||||
| 291 | |||||
| 292 | sub foo ($left, $right) { | ||||
| 293 | return $left + $right; | ||||
| 294 | } | ||||
| 295 | |||||
| 296 | See L<perlsub/Signatures> for details. | ||||
| 297 | |||||
| 298 | This feature is available from Perl 5.20 onwards. | ||||
| 299 | |||||
| 300 | =head2 The 'refaliasing' feature | ||||
| 301 | |||||
| 302 | B<WARNING>: This feature is still experimental and the implementation may | ||||
| 303 | change in future versions of Perl. For this reason, Perl will | ||||
| 304 | warn when you use the feature, unless you have explicitly disabled the | ||||
| 305 | warning: | ||||
| 306 | |||||
| 307 | no warnings "experimental::refaliasing"; | ||||
| 308 | |||||
| 309 | This enables aliasing via assignment to references: | ||||
| 310 | |||||
| 311 | \$a = \$b; # $a and $b now point to the same scalar | ||||
| 312 | \@a = \@b; # to the same array | ||||
| 313 | \%a = \%b; | ||||
| 314 | \&a = \&b; | ||||
| 315 | foreach \%hash (@array_of_hash_refs) { | ||||
| 316 | ... | ||||
| 317 | } | ||||
| 318 | |||||
| 319 | See L<perlref/Assigning to References> for details. | ||||
| 320 | |||||
| 321 | This feature is available from Perl 5.22 onwards. | ||||
| 322 | |||||
| 323 | =head2 The 'bitwise' feature | ||||
| 324 | |||||
| 325 | B<WARNING>: This feature is still experimental and the implementation may | ||||
| 326 | change in future versions of Perl. For this reason, Perl will | ||||
| 327 | warn when you use the feature, unless you have explicitly disabled the | ||||
| 328 | warning: | ||||
| 329 | |||||
| 330 | no warnings "experimental::bitwise"; | ||||
| 331 | |||||
| 332 | This makes the four standard bitwise operators (C<& | ^ ~>) treat their | ||||
| 333 | operands consistently as numbers, and introduces four new dotted operators | ||||
| 334 | (C<&. |. ^. ~.>) that treat their operands consistently as strings. The | ||||
| 335 | same applies to the assignment variants (C<&= |= ^= &.= |.= ^.=>). | ||||
| 336 | |||||
| 337 | See L<perlop/Bitwise String Operators> for details. | ||||
| 338 | |||||
| 339 | This feature is available from Perl 5.22 onwards. | ||||
| 340 | |||||
| 341 | =head1 FEATURE BUNDLES | ||||
| 342 | |||||
| 343 | It's possible to load multiple features together, using | ||||
| 344 | a I<feature bundle>. The name of a feature bundle is prefixed with | ||||
| 345 | a colon, to distinguish it from an actual feature. | ||||
| 346 | |||||
| 347 | use feature ":5.10"; | ||||
| 348 | |||||
| 349 | The following feature bundles are available: | ||||
| 350 | |||||
| 351 | bundle features included | ||||
| 352 | --------- ----------------- | ||||
| 353 | :default array_base | ||||
| 354 | |||||
| 355 | :5.10 say state switch array_base | ||||
| 356 | |||||
| 357 | :5.12 say state switch unicode_strings array_base | ||||
| 358 | |||||
| 359 | :5.14 say state switch unicode_strings array_base | ||||
| 360 | |||||
| 361 | :5.16 say state switch unicode_strings | ||||
| 362 | unicode_eval evalbytes current_sub fc | ||||
| 363 | |||||
| 364 | :5.18 say state switch unicode_strings | ||||
| 365 | unicode_eval evalbytes current_sub fc | ||||
| 366 | |||||
| 367 | :5.20 say state switch unicode_strings | ||||
| 368 | unicode_eval evalbytes current_sub fc | ||||
| 369 | |||||
| 370 | :5.22 say state switch unicode_strings | ||||
| 371 | unicode_eval evalbytes current_sub fc | ||||
| 372 | |||||
| 373 | The C<:default> bundle represents the feature set that is enabled before | ||||
| 374 | any C<use feature> or C<no feature> declaration. | ||||
| 375 | |||||
| 376 | Specifying sub-versions such as the C<0> in C<5.14.0> in feature bundles has | ||||
| 377 | no effect. Feature bundles are guaranteed to be the same for all sub-versions. | ||||
| 378 | |||||
| 379 | use feature ":5.14.0"; # same as ":5.14" | ||||
| 380 | use feature ":5.14.1"; # same as ":5.14" | ||||
| 381 | |||||
| 382 | =head1 IMPLICIT LOADING | ||||
| 383 | |||||
| 384 | Instead of loading feature bundles by name, it is easier to let Perl do | ||||
| 385 | implicit loading of a feature bundle for you. | ||||
| 386 | |||||
| 387 | There are two ways to load the C<feature> pragma implicitly: | ||||
| 388 | |||||
| 389 | =over 4 | ||||
| 390 | |||||
| 391 | =item * | ||||
| 392 | |||||
| 393 | By using the C<-E> switch on the Perl command-line instead of C<-e>. | ||||
| 394 | That will enable the feature bundle for that version of Perl in the | ||||
| 395 | main compilation unit (that is, the one-liner that follows C<-E>). | ||||
| 396 | |||||
| 397 | =item * | ||||
| 398 | |||||
| 399 | By explicitly requiring a minimum Perl version number for your program, with | ||||
| 400 | the C<use VERSION> construct. That is, | ||||
| 401 | |||||
| 402 | use v5.10.0; | ||||
| 403 | |||||
| 404 | will do an implicit | ||||
| 405 | |||||
| 406 | no feature ':all'; | ||||
| 407 | use feature ':5.10'; | ||||
| 408 | |||||
| 409 | and so on. Note how the trailing sub-version | ||||
| 410 | is automatically stripped from the | ||||
| 411 | version. | ||||
| 412 | |||||
| 413 | But to avoid portability warnings (see L<perlfunc/use>), you may prefer: | ||||
| 414 | |||||
| 415 | use 5.010; | ||||
| 416 | |||||
| 417 | with the same effect. | ||||
| 418 | |||||
| 419 | If the required version is older than Perl 5.10, the ":default" feature | ||||
| 420 | bundle is automatically loaded instead. | ||||
| 421 | |||||
| 422 | =back | ||||
| 423 | |||||
| 424 | =cut | ||||
| 425 | |||||
| 426 | # spent 83µs (17+66) within feature::import which was called:
# once (17µs+66µs) by main::BEGIN@0.1 at line 0 of -e | ||||
| 427 | 1 | 900ns | my $class = shift; | ||
| 428 | |||||
| 429 | 1 | 600ns | if (!@_) { | ||
| 430 | croak("No features specified"); | ||||
| 431 | } | ||||
| 432 | |||||
| 433 | 1 | 5µs | 1 | 66µs | __common(1, @_); # spent 66µs making 1 call to feature::__common |
| 434 | } | ||||
| 435 | |||||
| 436 | sub unimport { | ||||
| 437 | my $class = shift; | ||||
| 438 | |||||
| 439 | # A bare C<no feature> should reset to the default bundle | ||||
| 440 | if (!@_) { | ||||
| 441 | $^H &= ~($hint_uni8bit|$hint_mask); | ||||
| 442 | return; | ||||
| 443 | } | ||||
| 444 | |||||
| 445 | __common(0, @_); | ||||
| 446 | } | ||||
| 447 | |||||
| 448 | |||||
| 449 | # spent 66µs within feature::__common which was called:
# once (66µs+0s) by feature::import at line 433 | ||||
| 450 | 1 | 300ns | my $import = shift; | ||
| 451 | 1 | 2µs | my $bundle_number = $^H & $hint_mask; | ||
| 452 | my $features = $bundle_number != $hint_mask | ||||
| 453 | 1 | 2µs | && $feature_bundle{$hint_bundles[$bundle_number >> $hint_shift]}; | ||
| 454 | 1 | 600ns | if ($features) { | ||
| 455 | # Features are enabled implicitly via bundle hints. | ||||
| 456 | # Delete any keys that may be left over from last time. | ||||
| 457 | 1 | 23µs | delete @^H{ values(%feature) }; | ||
| 458 | 1 | 1µs | $^H |= $hint_mask; | ||
| 459 | 1 | 2µs | for (@$features) { | ||
| 460 | 1 | 2µs | $^H{$feature{$_}} = 1; | ||
| 461 | 1 | 1µs | $^H |= $hint_uni8bit if $_ eq 'unicode_strings'; | ||
| 462 | } | ||||
| 463 | } | ||||
| 464 | 1 | 13µs | while (@_) { | ||
| 465 | 9 | 2µs | my $name = shift; | ||
| 466 | 9 | 3µs | if (substr($name, 0, 1) eq ":") { | ||
| 467 | 1 | 600ns | my $v = substr($name, 1); | ||
| 468 | 1 | 500ns | if (!exists $feature_bundle{$v}) { | ||
| 469 | $v =~ s/^([0-9]+)\.([0-9]+).[0-9]+$/$1.$2/; | ||||
| 470 | if (!exists $feature_bundle{$v}) { | ||||
| 471 | unknown_feature_bundle(substr($name, 1)); | ||||
| 472 | } | ||||
| 473 | } | ||||
| 474 | 1 | 3µs | unshift @_, @{$feature_bundle{$v}}; | ||
| 475 | 1 | 1µs | next; | ||
| 476 | } | ||||
| 477 | 8 | 2µs | if (!exists $feature{$name}) { | ||
| 478 | unknown_feature($name); | ||||
| 479 | } | ||||
| 480 | 8 | 3µs | if ($import) { | ||
| 481 | 8 | 11µs | $^H{$feature{$name}} = 1; | ||
| 482 | 8 | 2µs | $^H |= $hint_uni8bit if $name eq 'unicode_strings'; | ||
| 483 | } else { | ||||
| 484 | delete $^H{$feature{$name}}; | ||||
| 485 | $^H &= ~ $hint_uni8bit if $name eq 'unicode_strings'; | ||||
| 486 | } | ||||
| 487 | } | ||||
| 488 | } | ||||
| 489 | |||||
| 490 | sub unknown_feature { | ||||
| 491 | my $feature = shift; | ||||
| 492 | croak(sprintf('Feature "%s" is not supported by Perl %vd', | ||||
| 493 | $feature, $^V)); | ||||
| 494 | } | ||||
| 495 | |||||
| 496 | sub unknown_feature_bundle { | ||||
| 497 | my $feature = shift; | ||||
| 498 | croak(sprintf('Feature bundle "%s" is not supported by Perl %vd', | ||||
| 499 | $feature, $^V)); | ||||
| 500 | } | ||||
| 501 | |||||
| 502 | sub croak { | ||||
| 503 | require Carp; | ||||
| 504 | Carp::croak(@_); | ||||
| 505 | } | ||||
| 506 | |||||
| 507 | 1 | 14µs | 1; | ||
| 508 | |||||
| 509 | # ex: set ro: |