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package B::Showlex;

our $VERSION = '1.05';

use strict;
use B qw(svref_2object comppadlist class);
use B::Terse ();
use B::Concise ();

#
# Invoke as
#     perl -MO=Showlex,foo bar.pl
# to see the names of lexical variables used by &foo
# or as
#     perl -MO=Showlex bar.pl
# to see the names of file scope lexicals used by bar.pl
#


# borrowed from B::Concise
our $walkHandle = \*STDOUT;

sub walk_output { # updates $walkHandle
    $walkHandle = B::Concise::walk_output(@_);
    #print "got $walkHandle";
    #print $walkHandle "using it";
    $walkHandle;
}

sub shownamearray {
    my ($name, $av) = @_;
    my @els = $av->ARRAY;
    my $count = @els;
    my $i;
    print $walkHandle "$name has $count entries\n";
    for ($i = 0; $i < $count; $i++) {
	my $sv = $els[$i];
	if (class($sv) ne "SPECIAL") {
	    printf $walkHandle "$i: (0x%lx) %s\n",
				$$sv, $sv->PVX // "undef" || "const";
	} else {
	    printf $walkHandle "$i: %s\n", $sv->terse;
	    #printf $walkHandle "$i: %s\n", B::Concise::concise_sv($sv);
	}
    }
}

sub showvaluearray {
    my ($name, $av) = @_;
    my @els = $av->ARRAY;
    my $count = @els;
    my $i;
    print $walkHandle "$name has $count entries\n";
    for ($i = 0; $i < $count; $i++) {
	printf $walkHandle "$i: %s\n", $els[$i]->terse;
	#print $walkHandle "$i: %s\n", B::Concise::concise_sv($els[$i]);
    }
}

sub showlex {
    my ($objname, $namesav, $valsav) = @_;
    shownamearray("Pad of lexical names for $objname", $namesav);
    showvaluearray("Pad of lexical values for $objname", $valsav);
}

my ($newlex, $nosp1); # rendering state vars

sub padname_terse {
    my $name = shift;
    return $name->terse if class($name) eq 'SPECIAL';
    my $str = $name->PVX;
    return sprintf "(0x%lx) %s",
	       $$name,
	       length $str ? qq'"$str"' : defined $str ? "const" : 'undef';
}

sub newlex { # drop-in for showlex
    my ($objname, $names, $vals) = @_;
    my @names = $names->ARRAY;
    my @vals  = $vals->ARRAY;
    my $count = @names;
    print $walkHandle "$objname Pad has $count entries\n";
    printf $walkHandle "0: %s\n", padname_terse($names[0]) unless $nosp1;
    for (my $i = 1; $i < $count; $i++) {
	printf $walkHandle "$i: %s = %s\n", padname_terse($names[$i]),
					    $vals[$i]->terse,
	    unless $nosp1
	       and class($names[$i]) eq 'SPECIAL' || !$names[$i]->LEN;
    }
}

sub showlex_obj {
    my ($objname, $obj) = @_;
    $objname =~ s/^&main::/&/;
    showlex($objname, svref_2object($obj)->PADLIST->ARRAY) if !$newlex;
    newlex ($objname, svref_2object($obj)->PADLIST->ARRAY) if  $newlex;
}

sub showlex_main {
    showlex("comppadlist", comppadlist->ARRAY)	if !$newlex;
    newlex ("main", comppadlist->ARRAY)		if  $newlex;
}

sub compile {
    my @options = grep(/^-/, @_);
    my @args = grep(!/^-/, @_);
    for my $o (@options) {
	$newlex = 1 if $o eq "-newlex";
	$nosp1  = 1 if $o eq "-nosp";
    }

    return \&showlex_main unless @args;
    return sub {
	my $objref;
	foreach my $objname (@args) {
	    next unless $objname;	# skip nulls w/o carping

	    if (ref $objname) {
		print $walkHandle "B::Showlex::compile($objname)\n";
		$objref = $objname;
	    } else {
		$objname = "main::$objname" unless $objname =~ /::/;
		print $walkHandle "$objname:\n";
		no strict 'refs';
		die "err: unknown function ($objname)\n"
		    unless *{$objname}{CODE};
		$objref = \&$objname;
	    }
	    showlex_obj($objname, $objref);
	}
    }
}

1;

__END__

=head1 NAME

B::Showlex - Show lexical variables used in functions or files

=head1 SYNOPSIS

	perl -MO=Showlex[,-OPTIONS][,SUBROUTINE] foo.pl

=head1 DESCRIPTION

When a comma-separated list of subroutine names is given as options, Showlex
prints the lexical variables used in those subroutines.  Otherwise, it prints
the file-scope lexicals in the file.

=head1 EXAMPLES

Traditional form:

 $ perl -MO=Showlex -e 'my ($i,$j,$k)=(1,"foo")'
 Pad of lexical names for comppadlist has 4 entries
 0: (0x8caea4) undef
 1: (0x9db0fb0) $i
 2: (0x9db0f38) $j
 3: (0x9db0f50) $k
 Pad of lexical values for comppadlist has 5 entries
 0: SPECIAL #1 &PL_sv_undef
 1: NULL (0x9da4234)
 2: NULL (0x9db0f2c)
 3: NULL (0x9db0f44)
 4: NULL (0x9da4264)
 -e syntax OK

New-style form:

 $ perl -MO=Showlex,-newlex -e 'my ($i,$j,$k)=(1,"foo")'
 main Pad has 4 entries
 0: (0x8caea4) undef
 1: (0xa0c4fb8) "$i" = NULL (0xa0b8234)
 2: (0xa0c4f40) "$j" = NULL (0xa0c4f34)
 3: (0xa0c4f58) "$k" = NULL (0xa0c4f4c)
 -e syntax OK

New form, no specials, outside O framework:

 $ perl -MB::Showlex -e \
    'my ($i,$j,$k)=(1,"foo"); B::Showlex::compile(-newlex,-nosp)->()'
 main Pad has 4 entries
 1: (0x998ffb0) "$i" = IV (0x9983234) 1
 2: (0x998ff68) "$j" = PV (0x998ff5c) "foo"
 3: (0x998ff80) "$k" = NULL (0x998ff74)

Note that this example shows the values of the lexicals, whereas the other
examples did not (as they're compile-time only).

=head2 OPTIONS

The C<-newlex> option produces a more readable C<< name => value >> format,
and is shown in the second example above.

The C<-nosp> option eliminates reporting of SPECIALs, such as C<0: SPECIAL
#1 &PL_sv_undef> above.  Reporting of SPECIALs can sometimes overwhelm
your declared lexicals.

=head1 SEE ALSO

L<B::Showlex> can also be used outside of the O framework, as in the third
example.  See L<B::Concise> for a fuller explanation of reasons.

=head1 TODO

Some of the reported info, such as hex addresses, is not particularly
valuable.  Other information would be more useful for the typical
programmer, such as line-numbers, pad-slot reuses, etc..  Given this,
-newlex is not a particularly good flag-name.

=head1 AUTHOR

Malcolm Beattie, C<mbeattie@sable.ox.ac.uk>

=cut