Файловый менеджер - Редактировать - /home/lakoyani/lakoyani.com.fj/Util.pm.tar
Назад
usr/local/lib64/perl5/Scalar/Util.pm 0000444 00000023715 14711270362 0013107 0 ustar 00 # Copyright (c) 1997-2007 Graham Barr <gbarr@pobox.com>. All rights reserved. # This program is free software; you can redistribute it and/or # modify it under the same terms as Perl itself. # # Maintained since 2013 by Paul Evans <leonerd@leonerd.org.uk> package Scalar::Util; use strict; use warnings; require Exporter; our @ISA = qw(Exporter); our @EXPORT_OK = qw( blessed refaddr reftype weaken unweaken isweak dualvar isdual isvstring looks_like_number openhandle readonly set_prototype tainted ); our $VERSION = "1.56"; $VERSION =~ tr/_//d; require List::Util; # List::Util loads the XS List::Util->VERSION( $VERSION ); # Ensure we got the right XS version (RT#100863) our @EXPORT_FAIL; unless (defined &weaken) { push @EXPORT_FAIL, qw(weaken); } unless (defined &isweak) { push @EXPORT_FAIL, qw(isweak isvstring); } unless (defined &isvstring) { push @EXPORT_FAIL, qw(isvstring); } sub export_fail { if (grep { /^(?:weaken|isweak)$/ } @_ ) { require Carp; Carp::croak("Weak references are not implemented in the version of perl"); } if (grep { /^isvstring$/ } @_ ) { require Carp; Carp::croak("Vstrings are not implemented in the version of perl"); } @_; } # set_prototype has been moved to Sub::Util with a different interface sub set_prototype(&$) { my ( $code, $proto ) = @_; return Sub::Util::set_prototype( $proto, $code ); } 1; __END__ =head1 NAME Scalar::Util - A selection of general-utility scalar subroutines =head1 SYNOPSIS use Scalar::Util qw(blessed dualvar isdual readonly refaddr reftype tainted weaken isweak isvstring looks_like_number set_prototype); # and other useful utils appearing below =head1 DESCRIPTION C<Scalar::Util> contains a selection of subroutines that people have expressed would be nice to have in the perl core, but the usage would not really be high enough to warrant the use of a keyword, and the size would be so small that being individual extensions would be wasteful. By default C<Scalar::Util> does not export any subroutines. =cut =head1 FUNCTIONS FOR REFERENCES The following functions all perform some useful activity on reference values. =head2 blessed my $pkg = blessed( $ref ); If C<$ref> is a blessed reference, the name of the package that it is blessed into is returned. Otherwise C<undef> is returned. $scalar = "foo"; $class = blessed $scalar; # undef $ref = []; $class = blessed $ref; # undef $obj = bless [], "Foo"; $class = blessed $obj; # "Foo" Take care when using this function simply as a truth test (such as in C<if(blessed $ref)...>) because the package name C<"0"> is defined yet false. =head2 refaddr my $addr = refaddr( $ref ); If C<$ref> is reference, the internal memory address of the referenced value is returned as a plain integer. Otherwise C<undef> is returned. $addr = refaddr "string"; # undef $addr = refaddr \$var; # eg 12345678 $addr = refaddr []; # eg 23456784 $obj = bless {}, "Foo"; $addr = refaddr $obj; # eg 88123488 =head2 reftype my $type = reftype( $ref ); If C<$ref> is a reference, the basic Perl type of the variable referenced is returned as a plain string (such as C<ARRAY> or C<HASH>). Otherwise C<undef> is returned. $type = reftype "string"; # undef $type = reftype \$var; # SCALAR $type = reftype []; # ARRAY $obj = bless {}, "Foo"; $type = reftype $obj; # HASH Note that for internal reasons, all precompiled regexps (C<qr/.../>) are blessed references; thus C<ref()> returns the package name string C<"Regexp"> on these but C<reftype()> will return the underlying C structure type of C<"REGEXP"> in all capitals. =head2 weaken weaken( $ref ); The lvalue C<$ref> will be turned into a weak reference. This means that it will not hold a reference count on the object it references. Also, when the reference count on that object reaches zero, the reference will be set to undef. This function mutates the lvalue passed as its argument and returns no value. This is useful for keeping copies of references, but you don't want to prevent the object being DESTROY-ed at its usual time. { my $var; $ref = \$var; weaken($ref); # Make $ref a weak reference } # $ref is now undef Note that if you take a copy of a scalar with a weakened reference, the copy will be a strong reference. my $var; my $foo = \$var; weaken($foo); # Make $foo a weak reference my $bar = $foo; # $bar is now a strong reference This may be less obvious in other situations, such as C<grep()>, for instance when grepping through a list of weakened references to objects that may have been destroyed already: @object = grep { defined } @object; This will indeed remove all references to destroyed objects, but the remaining references to objects will be strong, causing the remaining objects to never be destroyed because there is now always a strong reference to them in the @object array. =head2 unweaken unweaken( $ref ); I<Since version 1.36.> The lvalue C<REF> will be turned from a weak reference back into a normal (strong) reference again. This function mutates the lvalue passed as its argument and returns no value. This undoes the action performed by L</weaken>. This function is slightly neater and more convenient than the otherwise-equivalent code my $tmp = $REF; undef $REF; $REF = $tmp; (because in particular, simply assigning a weak reference back to itself does not work to unweaken it; C<$REF = $REF> does not work). =head2 isweak my $weak = isweak( $ref ); Returns true if C<$ref> is a weak reference. $ref = \$foo; $weak = isweak($ref); # false weaken($ref); $weak = isweak($ref); # true B<NOTE>: Copying a weak reference creates a normal, strong, reference. $copy = $ref; $weak = isweak($copy); # false =head1 OTHER FUNCTIONS =head2 dualvar my $var = dualvar( $num, $string ); Returns a scalar that has the value C<$num> in a numeric context and the value C<$string> in a string context. $foo = dualvar 10, "Hello"; $num = $foo + 2; # 12 $str = $foo . " world"; # Hello world =head2 isdual my $dual = isdual( $var ); I<Since version 1.26.> If C<$var> is a scalar that has both numeric and string values, the result is true. $foo = dualvar 86, "Nix"; $dual = isdual($foo); # true Note that a scalar can be made to have both string and numeric content through numeric operations: $foo = "10"; $dual = isdual($foo); # false $bar = $foo + 0; $dual = isdual($foo); # true Note that although C<$!> appears to be a dual-valued variable, it is actually implemented as a magical variable inside the interpreter: $! = 1; print("$!\n"); # "Operation not permitted" $dual = isdual($!); # false You can capture its numeric and string content using: $err = dualvar $!, $!; $dual = isdual($err); # true =head2 isvstring my $vstring = isvstring( $var ); If C<$var> is a scalar which was coded as a vstring, the result is true. $vs = v49.46.48; $fmt = isvstring($vs) ? "%vd" : "%s"; #true printf($fmt,$vs); =head2 looks_like_number my $isnum = looks_like_number( $var ); Returns true if perl thinks C<$var> is a number. See L<perlapi/looks_like_number>. =head2 openhandle my $fh = openhandle( $fh ); Returns C<$fh> itself, if C<$fh> may be used as a filehandle and is open, or if it is a tied handle. Otherwise C<undef> is returned. $fh = openhandle(*STDIN); # \*STDIN $fh = openhandle(\*STDIN); # \*STDIN $fh = openhandle(*NOTOPEN); # undef $fh = openhandle("scalar"); # undef =head2 readonly my $ro = readonly( $var ); Returns true if C<$var> is readonly. sub foo { readonly($_[0]) } $readonly = foo($bar); # false $readonly = foo(0); # true =head2 set_prototype my $code = set_prototype( $code, $prototype ); Sets the prototype of the function given by the C<$code> reference, or deletes it if C<$prototype> is C<undef>. Returns the C<$code> reference itself. set_prototype \&foo, '$$'; =head2 tainted my $t = tainted( $var ); Return true if C<$var> is tainted. $taint = tainted("constant"); # false $taint = tainted($ENV{PWD}); # true if running under -T =head1 DIAGNOSTICS Module use may give one of the following errors during import. =over =item Weak references are not implemented in the version of perl The version of perl that you are using does not implement weak references, to use L</isweak> or L</weaken> you will need to use a newer release of perl. =item Vstrings are not implemented in the version of perl The version of perl that you are using does not implement Vstrings, to use L</isvstring> you will need to use a newer release of perl. =back =head1 KNOWN BUGS There is a bug in perl5.6.0 with UV's that are >= 1<<31. This will show up as tests 8 and 9 of dualvar.t failing =head1 SEE ALSO L<List::Util> =head1 COPYRIGHT Copyright (c) 1997-2007 Graham Barr <gbarr@pobox.com>. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. Additionally L</weaken> and L</isweak> which are Copyright (c) 1999 Tuomas J. Lukka <lukka@iki.fi>. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as perl itself. Copyright (C) 2004, 2008 Matthijs van Duin. All rights reserved. Copyright (C) 2014 cPanel Inc. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. =cut usr/local/lib64/perl5/Sub/Util.pm 0000444 00000011065 14711270546 0012432 0 ustar 00 # Copyright (c) 2014 Paul Evans <leonerd@leonerd.org.uk>. All rights reserved. # This program is free software; you can redistribute it and/or # modify it under the same terms as Perl itself. package Sub::Util; use strict; use warnings; require Exporter; our @ISA = qw( Exporter ); our @EXPORT_OK = qw( prototype set_prototype subname set_subname ); our $VERSION = "1.56"; $VERSION =~ tr/_//d; require List::Util; # as it has the XS List::Util->VERSION( $VERSION ); # Ensure we got the right XS version (RT#100863) =head1 NAME Sub::Util - A selection of utility subroutines for subs and CODE references =head1 SYNOPSIS use Sub::Util qw( prototype set_prototype subname set_subname ); =head1 DESCRIPTION C<Sub::Util> contains a selection of utility subroutines that are useful for operating on subs and CODE references. The rationale for inclusion in this module is that the function performs some work for which an XS implementation is essential because it cannot be implemented in Pure Perl, and which is sufficiently-widely used across CPAN that its popularity warrants inclusion in a core module, which this is. =cut =head1 FUNCTIONS =cut =head2 prototype my $proto = prototype( $code ) I<Since version 1.40.> Returns the prototype of the given C<$code> reference, if it has one, as a string. This is the same as the C<CORE::prototype> operator; it is included here simply for symmetry and completeness with the other functions. =cut sub prototype { my ( $code ) = @_; return CORE::prototype( $code ); } =head2 set_prototype my $code = set_prototype $prototype, $code; I<Since version 1.40.> Sets the prototype of the function given by the C<$code> reference, or deletes it if C<$prototype> is C<undef>. Returns the C<$code> reference itself. I<Caution>: This function takes arguments in a different order to the previous copy of the code from C<Scalar::Util>. This is to match the order of C<set_subname>, and other potential additions in this file. This order has been chosen as it allows a neat and simple chaining of other C<Sub::Util::set_*> functions as might become available, such as: my $code = set_subname name_here => set_prototype '&@' => set_attribute ':lvalue' => sub { ...... }; =cut =head2 subname my $name = subname( $code ) I<Since version 1.40.> Returns the name of the given C<$code> reference, if it has one. Normal named subs will give a fully-qualified name consisting of the package and the localname separated by C<::>. Anonymous code references will give C<__ANON__> as the localname. If the package the code was compiled in has been deleted (e.g. using C<delete_package> from L<Symbol>), C<__ANON__> will be returned as the package name. If a name has been set using L</set_subname>, this name will be returned instead. This function was inspired by C<sub_fullname> from L<Sub::Identify>. The remaining functions that C<Sub::Identify> implements can easily be emulated using regexp operations, such as sub get_code_info { return (subname $_[0]) =~ m/^(.+)::(.*?)$/ } sub sub_name { return (get_code_info $_[0])[0] } sub stash_name { return (get_code_info $_[0])[1] } I<Users of Sub::Name beware>: This function is B<not> the same as C<Sub::Name::subname>; it returns the existing name of the sub rather than changing it. To set or change a name, see instead L</set_subname>. =cut =head2 set_subname my $code = set_subname $name, $code; I<Since version 1.40.> Sets the name of the function given by the C<$code> reference. Returns the C<$code> reference itself. If the C<$name> is unqualified, the package of the caller is used to qualify it. This is useful for applying names to anonymous CODE references so that stack traces and similar situations, to give a useful name rather than having the default of C<__ANON__>. Note that this name is only used for this situation; the C<set_subname> will not install it into the symbol table; you will have to do that yourself if required. However, since the name is not used by perl except as the return value of C<caller>, for stack traces or similar, there is no actual requirement that the name be syntactically valid as a perl function name. This could be used to attach extra information that could be useful in debugging stack traces. This function was copied from C<Sub::Name::subname> and renamed to the naming convention of this module. =cut =head1 AUTHOR The general structure of this module was written by Paul Evans <leonerd@leonerd.org.uk>. The XS implementation of L</set_subname> was copied from L<Sub::Name> by Matthijs van Duin <xmath@cpan.org> =cut 1;
| ver. 1.4 |
Github
|
.
| PHP 7.4.33 | Генерация страницы: 0 |
proxy
|
phpinfo
|
Настройка