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: grep.go
    path of file: ./repos/kubeedge/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 (
	"regexp"
	"strings"

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

type GrepType int

const (
	Regexp GrepType = 1 << iota
	GreaterThanEq
	GreaterThan
	LessThan
	LessThanEq
)

// GrepFilter filters RNodes with a matching field
type GrepFilter struct {
	Path        []string `yaml:"path,omitempty"`
	Value       string   `yaml:"value,omitempty"`
	MatchType   GrepType `yaml:"matchType,omitempty"`
	InvertMatch bool     `yaml:"invertMatch,omitempty"`
	Compare     func(a, b string) (int, error)
}

var _ kio.Filter = GrepFilter{}

func (f GrepFilter) Filter(input []*yaml.RNode) ([]*yaml.RNode, error) {
	// compile the regular expression 1 time if we are matching using regex
	var reg *regexp.Regexp
	var err error
	if f.MatchType == Regexp || f.MatchType == 0 {
		reg, err = regexp.Compile(f.Value)
		if err != nil {
			return nil, err
		}
	}

	var output kio.ResourceNodeSlice
	for i := range input {
		node := input[i]
		val, err := node.Pipe(&yaml.PathMatcher{Path: f.Path})
		if err != nil {
			return nil, err
		}
		if val == nil || len(val.Content()) == 0 {
			if f.InvertMatch {
				output = append(output, input[i])
			}
			continue
		}
		found := false
		err = val.VisitElements(func(elem *yaml.RNode) error {
			// get the value
			var str string
			if f.MatchType == Regexp {
				style := elem.YNode().Style
				defer func() { elem.YNode().Style = style }()
				elem.YNode().Style = yaml.FlowStyle
				str, err = elem.String()
				if err != nil {
					return err
				}
				str = strings.TrimSpace(strings.ReplaceAll(str, `"`, ""))
			} else {
				// if not regexp, then it needs to parse into a quantity and comments will
				// break th
    
func (f GrepFilter) Filter(input []*yaml.RNode) ([]*yaml.RNode, error) {
	// compile the regular expression 1 time if we are matching using regex
	var reg *regexp.Regexp
	var err error
	if f.MatchType == Regexp || f.MatchType == 0 {
		reg, err = regexp.Compile(f.Value)
		if err != nil {
			return nil, err
		}
	}

	var output kio.ResourceNodeSlice
	for i := range input {
		node := input[i]
		val, err := node.Pipe(&yaml.PathMatcher{Path: f.Path})
		if err != nil {
			return nil, err
		}
		if val == nil || len(val.Content()) == 0 {
			if f.InvertMatch {
				output = append(output, input[i])
			}
			continue
		}
		found := false
		err = val.VisitElements(func(elem *yaml.RNode) error {
			// get the value
			var str string
			if f.MatchType == Regexp {
				style := elem.YNode().Style
				defer func() { elem.YNode().Style = style }()
				elem.YNode().Style = yaml.FlowStyle
				str, err = elem.String()
				if err != nil {
					return err
				}
				str = strings.TrimSpace(strings.ReplaceAll(str, `"`, ""))
			} else {
				// if not regexp, then it needs to parse into a quantity and comments will
				// break that
				str = elem.YNode().Value
				if str == "" {
					return nil
				}
			}

			if f.MatchType == Regexp || f.MatchType == 0 {
				if reg.MatchString(str) {
					found = true
				}
				return nil
			}

			comp, err := f.Compare(str, f.Value)
			if err != nil {
				return err
			}

			if f.MatchType == GreaterThan && comp > 0 {
				found = true
			}
			if f.MatchType == GreaterThanEq && comp >= 0 {
				found = true
			}
			if f.MatchType == LessThan && comp < 0 {
				found = true
			}
			if f.MatchType == LessThanEq && comp <= 0 {
				found = true
			}
			return nil
		})
		if err != nil {
			return nil, err
		}
		if found == f.InvertMatch {
			continue
		}

		output = append(output, input[i])
	}
	return output, nil
}