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Current File : //bin/pl2pm
#!/usr/bin/perl
    eval 'exec /usr/bin/perl -S $0 ${1+"$@"}'
	if $running_under_some_shell;

=head1 NAME

pl2pm - Rough tool to translate Perl4 .pl files to Perl5 .pm modules.

=head1 SYNOPSIS

B<pl2pm> F<files>

=head1 DESCRIPTION

B<pl2pm> is a tool to aid in the conversion of Perl4-style .pl
library files to Perl5-style library modules.  Usually, your old .pl
file will still work fine and you should only use this tool if you
plan to update your library to use some of the newer Perl 5 features,
such as AutoLoading.

=head1 LIMITATIONS

It's just a first step, but it's usually a good first step.

=head1 AUTHOR

Larry Wall <larry@wall.org>

=cut

use strict;
use warnings;

my %keyword = ();

while (<DATA>) {
    chomp;
    $keyword{$_} = 1;
}

local $/;

while (<>) {
    my $newname = $ARGV;
    $newname =~ s/\.pl$/.pm/ || next;
    $newname =~ s#(.*/)?(\w+)#$1\u$2#;
    if (-f $newname) {
	warn "Won't overwrite existing $newname\n";
	next;
    }
    my $oldpack = $2;
    my $newpack = "\u$2";
    my @export = ();

    s/\bstd(in|out|err)\b/\U$&/g;
    s/(sub\s+)(\w+)(\s*\{[ \t]*\n)\s*package\s+$oldpack\s*;[ \t]*\n+/${1}main'$2$3/ig;
    if (/sub\s+\w+'/) {
	@export = m/sub\s+\w+'(\w+)/g;
	s/(sub\s+)main'(\w+)/$1$2/g;
    }
    else {
	@export = m/sub\s+([A-Za-z]\w*)/g;
    }
    my @export_ok = grep($keyword{$_}, @export);
    @export = grep(!$keyword{$_}, @export);

    my %export = ();
    @export{@export} = (1) x @export;

    s/(^\s*);#/$1#/g;
    s/(#.*)require ['"]$oldpack\.pl['"]/$1use $newpack/;
    s/(package\s*)($oldpack)\s*;[ \t]*\n+//ig;
    s/([\$\@%&*])'(\w+)/&xlate($1,"",$2,$newpack,$oldpack,\%export)/eg;
    s/([\$\@%&*]?)(\w+)'(\w+)/&xlate($1,$2,$3,$newpack,$oldpack,\%export)/eg;
    if (!/\$\[\s*\)?\s*=\s*[^0\s]/) {
	s/^\s*(local\s*\()?\s*\$\[\s*\)?\s*=\s*0\s*;[ \t]*\n//g;
	s/\$\[\s*\+\s*//g;
	s/\s*\+\s*\$\[//g;
	s/\$\[/0/g;
    }
    s/open\s+(\w+)/open($1)/g;
 
    my $export_ok = '';
    my $carp      ='';


    if (s/\bdie\b/croak/g) {
	$carp = "use Carp;\n";
	s/croak "([^"]*)\\n"/croak "$1"/g;
    }

    if (@export_ok) {
	$export_ok = "\@EXPORT_OK = qw(@export_ok);\n";
    }

    if ( open(PM, ">$newname") ) {
        print PM <<"END";
package $newpack;
use 5.006;
require Exporter;
$carp
\@ISA = qw(Exporter);
\@EXPORT = qw(@export);
$export_ok
$_
END
    }
    else {
      warn "Can't create $newname: $!\n";
    }
}

sub xlate {
    my ($prefix, $pack, $ident,$newpack,$oldpack,$export) = @_;

    my $xlated ;
    if ($prefix eq '' && $ident =~ /^(t|s|m|d|ing|ll|ed|ve|re)$/) {
	$xlated = "${pack}'$ident";
    }
    elsif ($pack eq '' || $pack eq 'main') {
	if ($export->{$ident}) {
	    $xlated = "$prefix$ident";
	}
	else {
	    $xlated = "$prefix${pack}::$ident";
	}
    }
    elsif ($pack eq $oldpack) {
	$xlated = "$prefix${newpack}::$ident";
    }
    else {
	$xlated = "$prefix${pack}::$ident";
    }

    return $xlated;
}
__END__
AUTOLOAD
BEGIN
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CORE
DESTROY
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getppid
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getprotobyname
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getprotoent
getpwent
getpwnam
getpwuid
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