You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: filters.go
    path of file: ./repos/kubernetes/vendor/sigs.k8s.io/kustomize/kyaml/kio/filters
    
    the code of the file until where you have to start completion: // Copyright 2019 The Kubernetes Authors.
// SPDX-License-Identifier: Apache-2.0

package filters

import (
	"fmt"
	"sort"
	"strings"

	"sigs.k8s.io/kustomize/kyaml/kio"
	"sigs.k8s.io/kustomize/kyaml/kio/kioutil"
	"sigs.k8s.io/kustomize/kyaml/yaml"
)

// Filters are the list of known filters for unmarshalling a filter into a concrete
// implementation.
var Filter
    
func (f *FileSetter) Filter(input []*yaml.RNode) ([]*yaml.RNode, error) {
	if f.Mode == "" {
		f.Mode = fmt.Sprintf("%d", 0600)
	}
	if f.FilenamePattern == "" {
		f.FilenamePattern = DefaultFilenamePattern
	}

	resources := map[string][]*yaml.RNode{}
	for i := range input {
		if err := kioutil.CopyLegacyAnnotations(input[i]); err != nil {
			return nil, err
		}

		m, err := input[i].GetMeta()
		if err != nil {
			return nil, err
		}
		file := f.FilenamePattern
		file = strings.ReplaceAll(file, string(KindFmt), strings.ToLower(m.Kind))
		file = strings.ReplaceAll(file, string(NameFmt), strings.ToLower(m.Name))
		file = strings.ReplaceAll(file, string(NamespaceFmt), strings.ToLower(m.Namespace))

		if _, found := m.Annotations[kioutil.PathAnnotation]; !found || f.Override {
			if _, err := input[i].Pipe(yaml.SetAnnotation(kioutil.PathAnnotation, file)); err != nil {
				return nil, err
			}
			if _, err := input[i].Pipe(yaml.SetAnnotation(kioutil.LegacyPathAnnotation, file)); err != nil {
				return nil, err
			}
		}
		resources[file] = append(resources[file], input[i])
	}

	var output []*yaml.RNode
	for i := range resources {
		if err := kioutil.SortNodes(resources[i]); err != nil {
			return nil, err
		}
		for j := range resources[i] {
			if _, err := resources[i][j].Pipe(
				yaml.SetAnnotation(kioutil.IndexAnnotation, fmt.Sprintf("%d", j))); err != nil {
				return nil, err
			}
			if _, err := resources[i][j].Pipe(
				yaml.SetAnnotation(kioutil.LegacyIndexAnnotation, fmt.Sprintf("%d", j))); err != nil {
				return nil, err
			}
			output = append(output, resources[i][j])
		}
	}
	return output, nil
}