81 lines
1.5 KiB
Perl
81 lines
1.5 KiB
Perl
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package B::Showlex;
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use strict;
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use B qw(svref_2object comppadlist class);
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use B::Terse ();
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#
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# Invoke as
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# perl -MO=Showlex,foo bar.pl
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# to see the names of lexical variables used by &foo
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# or as
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# perl -MO=Showlex bar.pl
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# to see the names of file scope lexicals used by bar.pl
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#
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sub showarray {
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my ($name, $av) = @_;
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my @els = $av->ARRAY;
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my $count = @els;
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my $i;
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print "$name has $count entries\n";
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for ($i = 0; $i < $count; $i++) {
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print "$i: ";
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$els[$i]->terse;
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}
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}
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sub showlex {
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my ($objname, $namesav, $valsav) = @_;
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showarray("Pad of lexical names for $objname", $namesav);
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showarray("Pad of lexical values for $objname", $valsav);
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}
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sub showlex_obj {
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my ($objname, $obj) = @_;
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$objname =~ s/^&main::/&/;
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showlex($objname, svref_2object($obj)->PADLIST->ARRAY);
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}
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sub showlex_main {
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showlex("comppadlist", comppadlist->ARRAY);
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}
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sub compile {
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my @options = @_;
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if (@options) {
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return sub {
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my $objname;
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foreach $objname (@options) {
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$objname = "main::$objname" unless $objname =~ /::/;
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eval "showlex_obj('&$objname', \\&$objname)";
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}
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}
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} else {
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return \&showlex_main;
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}
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}
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1;
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__END__
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=head1 NAME
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B::Showlex - Show lexical variables used in functions or files
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=head1 SYNOPSIS
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perl -MO=Showlex[,SUBROUTINE] foo.pl
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=head1 DESCRIPTION
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When a subroutine name is provided in OPTIONS, prints the lexical
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variables used in that subroutine. Otherwise, prints the file-scope
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lexicals in the file.
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=head1 AUTHOR
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Malcolm Beattie, C<mbeattie@sable.ox.ac.uk>
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=cut
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