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                        if $@;

                    croak "No Inline::Filters::${filter_plugin}::filter sub found"
                        unless defined &{"Inline::Filters::${filter_plugin}::filter"};

                    my $filter_factory = \&{"Inline::Filters::${filter_plugin}::filter"};

                    $o->add_list($o->{ILSM}, $key, $filter_factory->(@args), []);
                }
                else {
                    eval { require Inline::Filters };
                    croak "'FILTERS' option requires Inline::Filters to be installed."
                        if $@;
                    %filters = Inline::Filters::get_filters($o->{API}{language})
                        unless keys %filters;
                    if (defined $filters{$val}) {
                        my $filter = Inline::Filters->new(
                            $val,
                                                          $filters{$val});
                        $o->add_list($o->{ILSM}, $key, $filter, []);
                    }
                    else {
                        croak "Invalid filter $val specified.";
                    }
                }
            }
            next;
        }
        if ($key eq 'STRUCTS') {
            # A list of struct names
            if (ref($value) eq 'ARRAY') {
                for my $val (@$value) {
                    croak "Invalid value for 'STRUCTS' option"
                        unless ($val =~ /^[_a-z][_0-9a-z]*$/i);
                    $o->{STRUCT}{$val}++;
                }
            }
            # Enable or disable
            elsif ($value =~ /^\d+$/) {
                $o->{STRUCT}{'.any'} = $value;
            }
            # A single struct name
            else {
                croak "Invalid value for 'STRUCTS' option"
                    unless ($value =~ /^[_a-z][_0-9a-z]*$/i);
                $o->{STRUCT}{$value}++;
            }
            eval { require Inline::Struct };
            croak "'STRUCTS' option requires Inline::Struct to be installed."
                if $@;
            $o->{STRUCT}{'.any'} = 1;
            next;
        }
        if ($key eq 'PROTOTYPES') {
            $o->{CONFIG}{PROTOTYPES} = $value;
            next if $value eq 'ENABLE';
            next if $value eq 'DISABLE';
            die "PROTOTYPES can be only either 'ENABLE' or 'DISABLE' - not $value";
        }
        if ($key eq 'PROTOTYPE') {
            die "PROTOTYPE configure arg must specify a hash reference"
                unless ref($value) eq 'HASH';
            $o->{CONFIG}{PROTOTYPE} = $value;
            next;
        }
        if ($key eq 'CPPFLAGS') {
            # C preprocessor flags, used by Inline::Filters::Preprocess()
            next;
        }

        my $class = ref $o; # handles subclasses correctly.
        croak "'$key' is not a valid config option for $class\n";
    }
}

sub add_list {
    my $o = shift;
    my ($ref, $key, $value, $default) = @_;
    $value = [$value] unless ref $value eq 'ARRAY';
    for (@$value) {
        if (defined $_) {
            push @{$ref->{$key}}, $_;
        }
        else {
            $ref->{$key} = $default;
        }
    }
}

sub add_string {
    my $o = shift;
    my ($ref, $key, $value, $default) = @_;
    $value = [$value] unless ref $value;
    croak usage_validate($key) unless ref($value) eq 'ARRAY';
    for (@$value) {
        if (defined $_) {
            $ref->{$key} .= ' ' . $_;
        }
        else {
            $ref->{$key} = $default;
        }
    }
}

sub add_text {
    my $o = shift;
    my ($ref, $key, $value, $default) = @_;
    $value = [$value] unless ref $value;
    croak usage_validate($key) unless ref($value) eq 'ARRAY';
    for (@$value) {
        if (defined $_) {
            chomp;
            $ref->{$key} .= $_ . "\n";
        }
        else {
            $ref->{$key} = $default;
        }
    }
}

#==============================================================================