# Scalar::Util.pm # # Copyright (c) 1997-2005 Graham Barr . All rights reserved. # This program is free software; you can redistribute it and/or # modify it under the same terms as Perl itself. package Scalar::Util; use strict; use vars qw(@ISA @EXPORT_OK $VERSION); require Exporter; require List::Util; # List::Util loads the XS @ISA = qw(Exporter); @EXPORT_OK = qw(blessed dualvar reftype weaken isweak tainted readonly openhandle refaddr isvstring looks_like_number set_prototype); $VERSION = "1.18"; $VERSION = eval $VERSION; sub export_fail { if (grep { /^(weaken|isweak)$/ } @_ ) { require Carp; Carp::croak("Weak references are not implemented in the version of perl"); } if (grep { /^(isvstring)$/ } @_ ) { require Carp; Carp::croak("Vstrings are not implemented in the version of perl"); } if (grep { /^(dualvar|set_prototype)$/ } @_ ) { require Carp; Carp::croak("$1 is only avaliable with the XS version"); } @_; } sub openhandle ($) { my $fh = shift; my $rt = reftype($fh) || ''; return defined(fileno($fh)) ? $fh : undef if $rt eq 'IO'; if (reftype(\$fh) eq 'GLOB') { # handle openhandle(*DATA) $fh = \(my $tmp=$fh); } elsif ($rt ne 'GLOB') { return undef; } (tied(*$fh) or defined(fileno($fh))) ? $fh : undef; } eval <<'ESQ' unless defined &dualvar; use vars qw(@EXPORT_FAIL); push @EXPORT_FAIL, qw(weaken isweak dualvar isvstring set_prototype); # The code beyond here is only used if the XS is not installed # Hope nobody defines a sub by this name sub UNIVERSAL::a_sub_not_likely_to_be_here { ref($_[0]) } sub blessed ($) { local($@, $SIG{__DIE__}, $SIG{__WARN__}); length(ref($_[0])) ? eval { $_[0]->a_sub_not_likely_to_be_here } : undef } sub refaddr($) { my $pkg = ref($_[0]) or return undef; if (blessed($_[0])) { bless $_[0], 'Scalar::Util::Fake'; } else { $pkg = undef; } "$_[0]" =~ /0x(\w+)/; my $i = do { local $^W; hex $1 }; bless $_[0], $pkg if defined $pkg; $i; } sub reftype ($) { local($@, $SIG{__DIE__}, $SIG{__WARN__}); my $r = shift; my $t; length($t = ref($r)) or return undef; # This eval will fail if the reference is not blessed eval { $r->a_sub_not_likely_to_be_here; 1 } ? do { $t = eval { # we have a GLOB or an IO. Stringify a GLOB gives it's name my $q = *$r; $q =~ /^\*/ ? "GLOB" : "IO"; } or do { # OK, if we don't have a GLOB what parts of # a glob will it populate. # NOTE: A glob always has a SCALAR local *glob = $r; defined *glob{ARRAY} && "ARRAY" or defined *glob{HASH} && "HASH" or defined *glob{CODE} && "CODE" or length(ref(${$r})) ? "REF" : "SCALAR"; } } : $t } sub tainted { local($@, $SIG{__DIE__}, $SIG{__WARN__}); local $^W = 0; eval { kill 0 * $_[0] }; $@ =~ /^Insecure/; } sub readonly { return 0 if tied($_[0]) || (ref(\($_[0])) ne "SCALAR"); local($@, $SIG{__DIE__}, $SIG{__WARN__}); my $tmp = $_[0]; !eval { $_[0] = $tmp; 1 }; } sub looks_like_number { local $_ = shift; # checks from perlfaq4 return 0 if !defined($_) or ref($_); return 1 if (/^[+-]?\d+$/); # is a +/- integer return 1 if (/^([+-]?)(?=\d|\.\d)\d*(\.\d*)?([Ee]([+-]?\d+))?$/); # a C float return 1 if ($] >= 5.008 and /^(Inf(inity)?|NaN)$/i) or ($] >= 5.006001 and /^Inf$/i); 0; } ESQ 1; __END__ =head1 NAME Scalar::Util - A selection of general-utility scalar subroutines =head1 SYNOPSIS use Scalar::Util qw(blessed dualvar isweak readonly refaddr reftype tainted weaken isvstring looks_like_number set_prototype); =head1 DESCRIPTION C 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 so small such that being individual extensions would be wasteful. By default C does not export any subroutines. The subroutines defined are =over 4 =item blessed EXPR If EXPR evaluates to a blessed reference the name of the package that it is blessed into is returned. Otherwise C is returned. $scalar = "foo"; $class = blessed $scalar; # undef $ref = []; $class = blessed $ref; # undef $obj = bless [], "Foo"; $class = blessed $obj; # "Foo" =item dualvar NUM, STRING Returns a scalar that has the value NUM in a numeric context and the value STRING in a string context. $foo = dualvar 10, "Hello"; $num = $foo + 2; # 12 $str = $foo . " world"; # Hello world =item isvstring EXPR If EXPR 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); =item isweak EXPR If EXPR is a scalar which is a weak reference the result is true. $ref = \$foo; $weak = isweak($ref); # false weaken($ref); $weak = isweak($ref); # true B: Copying a weak reference creates a normal, strong, reference. $copy = $ref; $weak = isweak($ref); # false =item looks_like_number EXPR Returns true if perl thinks EXPR is a number. See L. =item openhandle FH Returns FH if FH may be used as a filehandle and is open, or FH is a tied handle. Otherwise C is returned. $fh = openhandle(*STDIN); # \*STDIN $fh = openhandle(\*STDIN); # \*STDIN $fh = openhandle(*NOTOPEN); # undef $fh = openhandle("scalar"); # undef =item readonly SCALAR Returns true if SCALAR is readonly. sub foo { readonly($_[0]) } $readonly = foo($bar); # false $readonly = foo(0); # true =item refaddr EXPR If EXPR evaluates to a reference the internal memory address of the referenced value is returned. Otherwise C is returned. $addr = refaddr "string"; # undef $addr = refaddr \$var; # eg 12345678 $addr = refaddr []; # eg 23456784 $obj = bless {}, "Foo"; $addr = refaddr $obj; # eg 88123488 =item reftype EXPR If EXPR evaluates to a reference the type of the variable referenced is returned. Otherwise C is returned. $type = reftype "string"; # undef $type = reftype \$var; # SCALAR $type = reftype []; # ARRAY $obj = bless {}, "Foo"; $type = reftype $obj; # HASH =item set_prototype CODEREF, PROTOTYPE Sets the prototype of the given function, or deletes it if PROTOTYPE is undef. Returns the CODEREF. set_prototype \&foo, '$$'; =item tainted EXPR Return true if the result of EXPR is tainted $taint = tainted("constant"); # false $taint = tainted($ENV{PWD}); # true if running under -T =item weaken REF 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, REF will be set to undef. 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, 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. =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 COPYRIGHT Copyright (c) 1997-2005 Graham Barr . All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. Except weaken and isweak which are Copyright (c) 1999 Tuomas J. Lukka . All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as perl itself. =head1 BLATANT PLUG The weaken and isweak subroutines in this module and the patch to the core Perl were written in connection with the APress book `Tuomas J. Lukka's Definitive Guide to Object-Oriented Programming in Perl', to avoid explaining why certain things would have to be done in cumbersome ways. =cut