File Coverage

blib/lib/Win32/ShellQuote.pm

Criterion	Covered	Total	%
statement	61	68	89.7
branch	22	28	78.5
condition	8	12	66.6
subroutine	14	16	87.5
pod	8	10	80.0
total	113	134	84.3

package Win32::ShellQuote;
use strict;
use warnings FATAL => 'all';
use base 'Exporter';
use Carp;

our $VERSION = '0.003001';
$VERSION = eval $VERSION;

our @EXPORT_OK = qw(
    quote_native
    quote_cmd
    quote_system_list
    quote_system_string
    quote_system
    quote_system_cmd
    quote_literal
    cmd_escape
    unquote_native
    cmd_unescape
);
our %EXPORT_TAGS = (all => [@EXPORT_OK]);

sub quote_native {
    return join q{ }, quote_system_list(@_);
}

sub quote_cmd {
    return cmd_escape(quote_native(@_));
}

sub quote_system_list {
    # have to force quoting, or perl might try to use cmd anyway
    return map { quote_literal($_, 1) } @_;
}

sub quote_system_string {
    my $args = quote_native(@_);

    if (_has_shell_metachars($args)) {
        $args = cmd_escape($args);
    }
    return $args;
}

sub quote_system {
    if (@_ > 1) {
        return quote_system_list(@_);
    }
    else {
        return quote_system_string(@_);
    }
}

sub quote_system_cmd {
    # force cmd, even when running through system
    my $args = quote_native(@_);

    if (! _has_shell_metachars($args)) {
        # IT BURNS LOOK AWAY
        return '%PATH:~0,0%' . cmd_escape($args);
    }
    return cmd_escape($args);
}


sub cmd_escape {
    my $string = shift;
    if ($string =~ /[\r\n\0]/) {
        croak "can't quote newlines to pass through cmd.exe";
    }
    $string =~ s/([()%!^"<>&|])/^$1/g;
    return $string;
}

sub quote_literal {
    my ($text, $force) = @_;

    # basic argument quoting.  uses backslashes and quotes to escape
    # everything.
    if (!$force && $text ne '' && $text !~ /[ \t\n\x0b"]/) {
        # no quoting needed
    }
    else {
        $text =~ s{(\\*)(?="|\z)}{$1$1}g;
        $text =~ s{"}{\\"}g;
        $text = qq{"$text"};
    }

    return $text;
}

# derived from rules in code in win32.c
sub _has_shell_metachars {
    my $string = shift;

    return 1
        if $string =~ /%/;
    $string =~ s/(['"]).*?(\1|\z)//sg;
    return $string =~ /[<>|]/;
}

sub unquote_native {
    local ($_) = @_;
    my @argv;

    my $length = length
        or return @argv;

    m/\G\s*/gc;

    ARGS: until ( pos == $length ) {
        my $quote_mode;
        my $arg = '';
        CHARS: until ( pos == $length ) {
            if ( m/\G((?:\\\\)+)(?=\\?(")?)/gc ) {
                if (defined $2) {
                    $arg .= '\\' x (length($1) / 2);
                }
                else {
                    $arg .= $1;
                }
            }
            elsif ( m/\G\\"/gc ) {
                $arg .= '"';
            }
            elsif ( m/\G"/gc ) {
                if ( $quote_mode && m/\G"/gc ) {
                    $arg .= '"';
                }
                $quote_mode = !$quote_mode;
            }
            elsif ( !$quote_mode && m/\G\s+/gc ) {
                last;
            }
            elsif ( m/\G(.)/sgc ) {
                $arg .= $1;
            }
        }
        push @argv, $arg;
    }

    return @argv;
}

sub cmd_unescape {
    my ($string) = @_;

    no warnings 'uninitialized';
    $string =~ s/\^(.?)|([^^"]+)|("[^"]*(?:"|\z))/$1$2$3/gs;

    return $string;
}

1;

__END__