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    my $self = {
        _codespace => build_codespace($source),
        _stacks => [],
        _stack_index => 0,
        _x => 0,
        _y => 0,
        _dx => 0,
        _dy => 1,
        _encoding => $encoding,
    };
    bless $self, $class;

    return $self;
}

sub build_codespace {
    my ($source) = @_;

    my @lines = split /\r?\n/, $source;
    my @rows = ();
    for my $line (@lines) {