// it resumes reading the next one down.
type Stack struct {
	tr []TokenReader
}

// Push adds tr to the top (end) of the input stack. (Popping happens automatically.)
func (s *Stack) Push(tr TokenReader) {
	s.tr = append(s.tr, tr)
}

func (s *Stack) Next() ScanToken {
	tos := s.tr[len(s.tr)-1]
	tok := tos.Next()
	for tok == scanner.EOF && len(s.tr) > 1 {
		tos.Close()

		eventName, err := event.ParseName(s)
		if err != nil {
			writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
			return
		}
		mask.MergeMaskable(eventName)
		eventNames = append(eventNames, eventName)
	}

	if bucketName != "" {
		if _, err := objAPI.GetBucketInfo(ctx, bucketName, BucketOptions{}); err != nil {
			writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
			return
		}

	if node == "" {
		for index, e := range exp {
			result = append(result, localDisk{index: index, path: strings.Join(e, "")})
		}
	} else {
		for index, e := range exp {
			u, err := url.Parse(strings.Join(e, ""))
			if err != nil {
				return nil, err
			}
			if strings.Contains(u.Host, node) {
				result = append(result, localDisk{index: index, path: u.Path})
			}
		}
	}

	var binPaths []string
	for _, bindir := range in.cfg.CNIBinTargetDirs {
		for _, binary := range installedBinFiles.UnsortedList() {
			binPaths = append(binPaths, filepath.Join(bindir, binary))
		}
	}
	targets := append(
		binPaths,
		in.cfg.MountedCNINetDir,
		in.cfg.K8sServiceAccountPath,
	)
	// Create file watcher before checking for installation

		stmt          = gorm.Statement{DB: db, Table: user.Table, Schema: user, Clauses: map[string]clause.Clause{}}
	)

	for _, c := range clauses {
		if _, ok := buildNamesMap[c.Name()]; !ok {
			buildNames = append(buildNames, c.Name())
			buildNamesMap[c.Name()] = true
		}

		stmt.AddClause(c)
	}

	stmt.Build(buildNames...)

	if strings.TrimSpace(stmt.SQL.String()) != result {

		}
		files := []file{}

		for _, f := range r.File {
			fr, err := f.Open()
			if err != nil {
				continue
			}
			content, err := io.ReadAll(fr)
			if err != nil {
				continue
			}
			files = append(files, file{header: &f.FileHeader, content: content})
			if _, err := r.Open(f.Name); err != nil {
				continue
			}
		}

		// If we were unable to read anything out of the archive don't

	var rm json.RawMessage = gotOut.Bytes()
	jsonOutput, err := json.MarshalIndent(rm, "", "    ")
	if err != nil {
		assert.NoError(t, err)
	}
	jsonOutput = append(jsonOutput, '\n')

	util.CompareContent(t, jsonOutput, "testdata/ecds/output.json")

	name := rm.Name
	metrics := make([]MetricV2, 0, 3)
	metrics = append(metrics, MetricV2{
		Description:    getResourceMetricDescription(subSys, name, help),
		Value:          rm.Current,
		VariableLabels: cloneMSS(rm.Labels),
	})

	if requireAvgMax {
		avgName := MetricName(fmt.Sprintf("%s_avg", name))
		avgHelp := fmt.Sprintf("%s (avg)", help)
		metrics = append(metrics, MetricV2{

			b := valueBuilders[j]()
			tests = append(tests, test{
				name: fmt.Sprint(a.GetTypeString(), "==", b.GetTypeString()),
				fields: fields{
					a: *a, b: *b,
				},
				wantOk: i == j,
			})
		}
	}
	for i := range valueBuilders {
		a := valueBuilders[i]()
		for j := range altValueBuilders {
			b := altValueBuilders[j]()
			tests = append(tests, test{

		c := s[i]
		if c < utf8.RuneSelf {
			i++
			invalid = false
			b = append(b, c)
			continue
		}
		_, wid := utf8.DecodeRune(s[i:])
		if wid == 1 {
			i++
			if !invalid {
				invalid = true
				b = append(b, replacement...)
			}
			continue
		}
		invalid = false
		b = append(b, s[i:i+wid]...)
		i += wid
	}
	return b
}