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: parser.go
    path of file: ./repos/sealer/vendor/github.com/containers/storage/pkg/idtools
    
    the code of the file until where you have to start completion: package idtools

import (
	"fmt"
	"math"
	"math/bits"
	"strconv"
	"strings"
)

func parseTriple(spec []string) (container, host, size uint32, err error) {
	cid, err := strconv.ParseUint(spec[0], 10, 32)
	if err != nil {
		return 0, 0, 0, fmt.Errorf("parsing id map value %q: %w", spec[0], err)
	}
	hid, err := strconv.ParseUint(spec[1], 10, 32)
	if err != nil {
		return 0, 0, 0, fmt.Errorf("parsing id map value %q: %w", spec[1], err)
	}
	sz, err := strconv.ParseUint(spec[2], 10, 32)
	if err != nil {
		return 0, 0, 0, fmt.Errorf("parsing id map value %q: %w", spec[2], err)
	}
	return uint32(cid), uint
    
func ParseIDMap(mapSpec []string, mapSetting string) (idmap []IDMap, err error) {
	stdErr := fmt.Errorf("initializing ID mappings: %s setting is malformed expected [\"uint32:uint32:uint32\"]: %q", mapSetting, mapSpec)
	for _, idMapSpec := range mapSpec {
		if idMapSpec == "" {
			continue
		}
		idSpec := strings.Split(idMapSpec, ":")
		if len(idSpec)%3 != 0 {
			return nil, stdErr
		}
		for i := range idSpec {
			if i%3 != 0 {
				continue
			}
			cid, hid, size, err := parseTriple(idSpec[i : i+3])
			if err != nil {
				return nil, stdErr
			}
			// Avoid possible integer overflow on 32bit builds
			if bits.UintSize == 32 && (cid > math.MaxInt32 || hid > math.MaxInt32 || size > math.MaxInt32) {
				return nil, stdErr
			}
			mapping := IDMap{
				ContainerID: int(cid),
				HostID:      int(hid),
				Size:        int(size),
			}
			idmap = append(idmap, mapping)
		}
	}
	return idmap, nil
}