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| -rw-r--r-- | Master/tlpkg/tlperl/lib/Scalar/Util.pm | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/Master/tlpkg/tlperl/lib/Scalar/Util.pm b/Master/tlpkg/tlperl/lib/Scalar/Util.pm new file mode 100644 index 00000000000..4ae525a17c0 --- /dev/null +++ b/Master/tlpkg/tlperl/lib/Scalar/Util.pm @@ -0,0 +1,147 @@ +# Scalar::Util.pm +# +# Copyright (c) 1997-2005 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. + +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__ + |