+ my $depth = 0;
+ my $call = caller($depth);
+ while ( $call eq __PACKAGE__ ) {
+ $depth++;
+ $call = caller($depth);
+ }
+ return $call;
+}
+
+# Done in evals to avoid confusing Perl::MinimumVersion
+eval( $] >= 5.006 ? <<'END_NEW' : <<'END_OLD' ); die $@ if $@;
+sub _read {
+ local *FH;
+ open( FH, '<', $_[0] ) or die "open($_[0]): $!";
+ my $string = do { local $/; <FH> };
+ close FH or die "close($_[0]): $!";
+ return $string;
+}
+END_NEW
+sub _read {
+ local *FH;
+ open( FH, "< $_[0]" ) or die "open($_[0]): $!";
+ my $string = do { local $/; <FH> };
+ close FH or die "close($_[0]): $!";
+ return $string;
+}
+END_OLD
+
+sub _readperl {
+ my $string = Module::Install::_read($_[0]);
+ $string =~ s/(?:\015{1,2}\012|\015|\012)/\n/sg;
+ $string =~ s/(\n)\n*__(?:DATA|END)__\b.*\z/$1/s;
+ $string =~ s/\n\n=\w+.+?\n\n=cut\b.+?\n+/\n\n/sg;
+ return $string;
+}
+
+sub _readpod {
+ my $string = Module::Install::_read($_[0]);
+ $string =~ s/(?:\015{1,2}\012|\015|\012)/\n/sg;
+ return $string if $_[0] =~ /\.pod\z/;
+ $string =~ s/(^|\n=cut\b.+?\n+)[^=\s].+?\n(\n=\w+|\z)/$1$2/sg;
+ $string =~ s/\n*=pod\b[^\n]*\n+/\n\n/sg;
+ $string =~ s/\n*=cut\b[^\n]*\n+/\n\n/sg;
+ $string =~ s/^\n+//s;
+ return $string;
+}
+
+# Done in evals to avoid confusing Perl::MinimumVersion
+eval( $] >= 5.006 ? <<'END_NEW' : <<'END_OLD' ); die $@ if $@;
+sub _write {
+ local *FH;
+ open( FH, '>', $_[0] ) or die "open($_[0]): $!";
+ foreach ( 1 .. $#_ ) {
+ print FH $_[$_] or die "print($_[0]): $!";
+ }
+ close FH or die "close($_[0]): $!";
+}
+END_NEW
+sub _write {
+ local *FH;
+ open( FH, "> $_[0]" ) or die "open($_[0]): $!";
+ foreach ( 1 .. $#_ ) {
+ print FH $_[$_] or die "print($_[0]): $!";
+ }
+ close FH or die "close($_[0]): $!";
+}
+END_OLD
+
+# _version is for processing module versions (eg, 1.03_05) not
+# Perl versions (eg, 5.8.1).
+sub _version ($) {
+ my $s = shift || 0;
+ my $d =()= $s =~ /(\.)/g;
+ if ( $d >= 2 ) {
+ # Normalise multipart versions
+ $s =~ s/(\.)(\d{1,3})/sprintf("$1%03d",$2)/eg;
+ }
+ $s =~ s/^(\d+)\.?//;
+ my $l = $1 || 0;
+ my @v = map {
+ $_ . '0' x (3 - length $_)
+ } $s =~ /(\d{1,3})\D?/g;
+ $l = $l . '.' . join '', @v if @v;
+ return $l + 0;
+}
+
+sub _cmp ($$) {
+ _version($_[1]) <=> _version($_[2]);
+}
+
+# Cloned from Params::Util::_CLASS
+sub _CLASS ($) {
+ (
+ defined $_[0]
+ and
+ ! ref $_[0]
+ and
+ $_[0] =~ m/^[^\W\d]\w*(?:::\w+)*\z/s
+ ) ? $_[0] : undef;