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: zoneinfo.go
    path of file: ./repos/kubernetes/vendor/github.com/prometheus/procfs
    
    the code of the file until where you have to start completion: // Copyright 2019 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

//go:build !windows
// +build !windows

package procfs

import (
	"bytes"
	"fmt"
	"os"
	"regexp"
	"strings"

	"github.com/prometheus/procfs/internal/util"
)

// Zoneinfo holds info parsed from /proc/zoneinfo.
type Zoneinfo struct {
	Node                       string
	Zone                       string
	NrFreePages                *int64
	Min                        *int64
	Low                        *int64
	High                       *int64
	Scanned                    *int64
	Spanned                    *int64
	Present                    *int64
	Managed                    *int64
	NrActiveAnon               *int64
	NrInactiveAnon             *int64
	NrIsolatedAnon             *int64
	NrAnonPages                *int64
	NrAnonTransparentHugepages *int64
	NrActiveFile               *int64
	NrInactiveFile             *int64
	NrIsolatedFile             *int64
	NrFilePages                *int64
	NrSlabReclaimable          *int64
	NrSlabUnreclaimable        *int64
	NrMlockStack               *int64
	NrKernelStack              *int64
	NrMapped                   *int64
	NrDirty                    *int64
	NrWriteback                *int64
	NrUnevictable              *int64
	NrShmem                    *int64
	NrDirtied                  *int64
	NrWritten                  *int64
	NumaHit                    *int64
	NumaMiss                   *int64
	NumaForeign                *int64
	NumaInterleave             *int64
	NumaLocal                  *int64
	NumaOther                  *int64
	Protection                 []*int64
}

var nodeZoneRE = regexp.MustCompile(`(\d+), zone\s+(\w+)`)

// Zoneinfo parses an zoneinfo-file (/proc/zoneinfo) and returns a slice of
// structs containing the relevant info.  More information available here:
// https://www.kernel.org/doc/Documentation/sysctl/vm.txt
func (fs FS) Zoneinfo() ([]Zoneinfo, error) {
	data, err := os.ReadFile(fs.proc
    
func parseZoneinfo(zoneinfoData []byte) ([]Zoneinfo, error) {

	zoneinfo := []Zoneinfo{}

	zoneinfoBlocks := bytes.Split(zoneinfoData, []byte("\nNode"))
	for _, block := range zoneinfoBlocks {
		var zoneinfoElement Zoneinfo
		lines := strings.Split(string(block), "\n")
		for _, line := range lines {

			if nodeZone := nodeZoneRE.FindStringSubmatch(line); nodeZone != nil {
				zoneinfoElement.Node = nodeZone[1]
				zoneinfoElement.Zone = nodeZone[2]
				continue
			}
			if strings.HasPrefix(strings.TrimSpace(line), "per-node stats") {
				continue
			}
			parts := strings.Fields(strings.TrimSpace(line))
			if len(parts) < 2 {
				continue
			}
			vp := util.NewValueParser(parts[1])
			switch parts[0] {
			case "nr_free_pages":
				zoneinfoElement.NrFreePages = vp.PInt64()
			case "min":
				zoneinfoElement.Min = vp.PInt64()
			case "low":
				zoneinfoElement.Low = vp.PInt64()
			case "high":
				zoneinfoElement.High = vp.PInt64()
			case "scanned":
				zoneinfoElement.Scanned = vp.PInt64()
			case "spanned":
				zoneinfoElement.Spanned = vp.PInt64()
			case "present":
				zoneinfoElement.Present = vp.PInt64()
			case "managed":
				zoneinfoElement.Managed = vp.PInt64()
			case "nr_active_anon":
				zoneinfoElement.NrActiveAnon = vp.PInt64()
			case "nr_inactive_anon":
				zoneinfoElement.NrInactiveAnon = vp.PInt64()
			case "nr_isolated_anon":
				zoneinfoElement.NrIsolatedAnon = vp.PInt64()
			case "nr_anon_pages":
				zoneinfoElement.NrAnonPages = vp.PInt64()
			case "nr_anon_transparent_hugepages":
				zoneinfoElement.NrAnonTransparentHugepages = vp.PInt64()
			case "nr_active_file":
				zoneinfoElement.NrActiveFile = vp.PInt64()
			case "nr_inactive_file":
				zoneinfoElement.NrInactiveFile = vp.PInt64()
			case "nr_isolated_file":
				zoneinfoElement.NrIsolatedFile = vp.PInt64()
			case "nr_file_pages":
				zoneinfoElement.NrFilePages = vp.PInt64()
			case "nr_slab_reclaimable":
				zoneinfoElement.NrSlabReclaimable = vp.PInt64()
			case "nr_slab_unreclaimable":
				zoneinfoElement.NrSlabUnreclaimable = vp.PInt64()
			case "nr_mlock_stack":
				zoneinfoElement.NrMlockStack = vp.PInt64()
			case "nr_kernel_stack":
				zoneinfoElement.NrKernelStack = vp.PInt64()
			case "nr_mapped":
				zoneinfoElement.NrMapped = vp.PInt64()
			case "nr_dirty":
				zoneinfoElement.NrDirty = vp.PInt64()
			case "nr_writeback":
				zoneinfoElement.NrWriteback = vp.PInt64()
			case "nr_unevictable":
				zoneinfoElement.NrUnevictable = vp.PInt64()
			case "nr_shmem":
				zoneinfoElement.NrShmem = vp.PInt64()
			case "nr_dirtied":
				zoneinfoElement.NrDirtied = vp.PInt64()
			case "nr_written":
				zoneinfoElement.NrWritten = vp.PInt64()
			case "numa_hit":
				zoneinfoElement.NumaHit = vp.PInt64()
			case "numa_miss":
				zoneinfoElement.NumaMiss = vp.PInt64()
			case "numa_foreign":
				zoneinfoElement.NumaForeign = vp.PInt64()
			case "numa_interleave":
				zoneinfoElement.NumaInterleave = vp.PInt64()
			case "numa_local":
				zoneinfoElement.NumaLocal = vp.PInt64()
			case "numa_other":
				zoneinfoElement.NumaOther = vp.PInt64()
			case "protection:":
				protectionParts := strings.Split(line, ":")
				protectionValues := strings.Replace(protectionParts[1], "(", "", 1)
				protectionValues = strings.Replace(protectionValues, ")", "", 1)
				protectionValues = strings.TrimSpace(protectionValues)
				protectionStringMap := strings.Split(protectionValues, ", ")
				val, err := util.ParsePInt64s(protectionStringMap)
				if err == nil {
					zoneinfoElement.Protection = val
				}
			}

		}

		zoneinfo = append(zoneinfo, zoneinfoElement)
	}
	return zoneinfo, nil
}