func (p *OpenMetricsParser) Next() (Entry, error) {
	var err error

	p.start = p.l.i
	p.offsets = p.offsets[:0]

	switch t := p.nextToken(); t {
	case tEofWord:
		if t := p.nextToken(); t != tEOF {
			return EntryInvalid, errors.New("unexpected data after # EOF")
		}
		return EntryInvalid, io.EOF
	case tEOF:
		return EntryInvalid, parseError("unexpected end of data", t)
	case tHelp, tType, tUnit:
		switch t := p.nextToken(); t {
		case tMName:
			p.offsets = append(p.offsets, p.l.start, p.l.i)
		default:
			return EntryInvalid, parseError("expected metric name after HELP", t)
		}
		switch t := p.nextToken(); t {
		case tText:
			if len(p.l.buf()) > 1 {
				p.text = p.l.buf()[1 : len(p.l.buf())-1]
			} else {
				p.text = []byte{}
			}
		default:
			return EntryInvalid, parseError("expected text in HELP", t)
		}
		switch t {
		case tType:
			switch s := yoloString(p.text); s {
			case "counter":
				p.mtype = MetricTypeCounter
			case "gauge":
				p.mtype = MetricTypeGauge
			case "histogram":
				p.mtype = MetricTypeHistogram
			case "gaugehistogram":
				p.mtype = MetricTypeGaugeHistogram
			case "summary":
				p.mtype = MetricTypeSummary
			case "info":
				p.mtype = MetricTypeInfo
			case "stateset":
				p.mtype = MetricTypeStateset
			case "unknown":
				p.mtype = MetricTypeUnknown
			default:
				return EntryInvalid, errors.Errorf("invalid metric type %q", s)
			}
		case tHelp:
			if !utf8.Valid(p.text) {
				return EntryInvalid, errors.New("help text is not a valid utf8 string")
			}
		}
		switch t {
		case tHelp:
			return EntryHelp, nil
		case tType:
			return EntryType, nil
		case tUnit:
			m := yoloString(p.l.b[p.offsets[0]:p.offsets[1]])
			u := yoloString(p.text)
			if len(u) > 0 {
				if !strings.HasSuffix(m, u) || len(m) < len(u)+1 || p.l.b[p.offsets[1]-len(u)-1] != '_' {
					return EntryInvalid, errors.Errorf("unit not a suffix of metric %q", m)
				}
			}
			return EntryUnit, nil
		}

	case tMName:
		p.offsets = append(p.offsets, p.l.i)
		p.series = p.l.b[p.start:p.l.i]

		t2 := p.nextToken()
		if t2 == tBraceOpen {
			if err := p.parseLVals(); err != nil {
				return EntryInvalid, err
			}
			p.series = p.l.b[p.start:p.l.i]
			t2 = p.nextToken()
		}
		if t2 != tValue {
			return EntryInvalid, parseError("expected value after metric", t)
		}
		if p.val, err = strconv.ParseFloat(yoloString(p.l.buf()[1:]), 64); err != nil {
			return EntryInvalid, err
		}
		// Ensure canonical NaN value.
		if math.IsNaN(p.val) {
			p.val = math.Float64frombits(value.NormalNaN)
		}
		p.hasTS = false
		switch p.nextToken() {
		case tLinebreak:
			break
		case tTimestamp:
			p.hasTS = true
			var ts float64
			// A float is enough to hold what we need for millisecond resolution.
			if ts, err = strconv.ParseFloat(yoloString(p.l.buf()[1:]), 64); err != nil {
				return EntryInvalid, err
			}
			p.ts = int64(ts * 1000)
			if t2 := p.nextToken(); t2 != tLinebreak {
				return EntryInvalid, parseError("expected next entry after timestamp", t)
			}
		default:
			return EntryInvalid, parseError("expected timestamp or new record", t)
		}
		return EntrySeries, nil

	default:
		err = errors.Errorf("%q %q is not a valid start token", t, string(p.l.cur()))
	}
	return EntryInvalid, err
}
func (p *OpenMetricsParser) Next() (Entry, error) {
	var err error

	p.start = p.l.i
	p.offsets = p.offsets[:0]

	switch t := p.nextToken(); t {
	case tEofWord:
		if t := p.nextToken(); t != tEOF {
			return EntryInvalid, errors.New("unexpected data after # EOF")
		}
		return EntryInvalid, io.EOF
	case tEOF:
		return EntryInvalid, parseError("unexpected end of data", t)
	case tHelp, tType, tUnit:
		switch t := p.nextToken(); t {
		case tMName:
			p.offsets = append(p.offsets, p.l.start, p.l.i)
		default:
			return EntryInvalid, parseError("expected metric name after HELP", t)
		}
		switch t := p.nextToken(); t {
		case tText:
			if len(p.l.buf()) > 1 {
				p.text = p.l.buf()[1 : len(p.l.buf())-1]
			} else {
				p.text = []byte{}
			}
		default:
			return EntryInvalid, parseError("expected text in HELP", t)
		}
		switch t {
		case tType:
			switch s := yoloString(p.text); s {
			case "counter":
				p.mtype = MetricTypeCounter
			case "gauge":
				p.mtype = MetricTypeGauge
			case "histogram":
				p.mtype = MetricTypeHistogram
			case "gaugehistogram":
				p.mtype = MetricTypeGaugeHistogram
			case "summary":
				p.mtype = MetricTypeSummary
			case "info":
				p.mtype = MetricTypeInfo
			case "stateset":
				p.mtype = MetricTypeStateset
			case "unknown":
				p.mtype = MetricTypeUnknown
			default:
				return EntryInvalid, errors.Errorf("invalid metric type %q", s)
			}
		case tHelp:
			if !utf8.Valid(p.text) {
				return EntryInvalid, errors.New("help text is not a valid utf8 string")
			}
		}
		switch t {
		case tHelp:
			return EntryHelp, nil
		case tType:
			return EntryType, nil
		case tUnit:
			m := yoloString(p.l.b[p.offsets[0]:p.offsets[1]])
			u := yoloString(p.text)
			if len(u) > 0 {
				if !strings.HasSuffix(m, u) || len(m) < len(u)+1 || p.l.b[p.offsets[1]-len(u)-1] != '_' {
					return EntryInvalid, errors.Errorf("unit not a suffix of metric %q", m)
				}
			}
			return EntryUnit, nil
		}

	case tMName:
		p.offsets = append(p.offsets, p.l.i)
		p.series = p.l.b[p.start:p.l.i]

		t2 := p.nextToken()
		if t2 == tBraceOpen {
			if err := p.parseLVals(); err != nil {
				return EntryInvalid, err
			}
			p.series = p.l.b[p.start:p.l.i]
			t2 = p.nextToken()
		}
		if t2 != tValue {
			return EntryInvalid, parseError("expected value after metric", t)
		}
		if p.val, err = strconv.ParseFloat(yoloString(p.l.buf()[1:]), 64); err != nil {
			return EntryInvalid, err
		}
		
		if math.IsNaN(p.val) {
			p.val = math.Float64frombits(value.NormalNaN)
		}
		p.hasTS = false
		switch p.nextToken() {
		case tLinebreak:
			break
		case tTimestamp:
			p.hasTS = true
			var ts float64
			
			if ts, err = strconv.ParseFloat(yoloString(p.l.buf()[1:]), 64); err != nil {
				return EntryInvalid, err
			}
			p.ts = int64(ts * 1000)
			if t2 := p.nextToken(); t2 != tLinebreak {
				return EntryInvalid, parseError("expected next entry after timestamp", t)
			}
		default:
			return EntryInvalid, parseError("expected timestamp or new record", t)
		}
		return EntrySeries, nil

	default:
		err = errors.Errorf("%q %q is not a valid start token", t, string(p.l.cur()))
	}
	return EntryInvalid, err
}
func ( p * OpenMetricsParser ) Next ( ) ( Entry , error ) { var err error p . start = p . l . i p . offsets = p . offsets [ : 0 ] switch t := p . nextToken ( ) ; t { case tEofWord : if t := p . nextToken ( ) ; t != tEOF { return EntryInvalid , errors . New ( " " ) } return EntryInvalid , io . EOF case tEOF : return EntryInvalid , parseError ( " " , t ) case tHelp , tType , tUnit : switch t := p . nextToken ( ) ; t { case tMName : p . offsets = append ( p . offsets , p . l . start , p . l . i ) default : return EntryInvalid , parseError ( " " , t ) } switch t := p . nextToken ( ) ; t { case tText : if len ( p . l . buf ( ) ) > 1 { p . text = p . l . buf ( ) [ 1 : len ( p . l . buf ( ) ) - 1 ] } else { p . text = [ ] byte { } } default : return EntryInvalid , parseError ( " " , t ) } switch t { case tType : switch s := yoloString ( p . text ) ; s { case " " : p . mtype = MetricTypeCounter case " " : p . mtype = MetricTypeGauge case " " : p . mtype = MetricTypeHistogram case " " : p . mtype = MetricTypeGaugeHistogram case " " : p . mtype = MetricTypeSummary case " " : p . mtype = MetricTypeInfo case " " : p . mtype = MetricTypeStateset case " " : p . mtype = MetricTypeUnknown default : return EntryInvalid , errors . Errorf ( " " , s ) } case tHelp : if ! utf8 . Valid ( p . text ) { return EntryInvalid , errors . New ( " " ) } } switch t { case tHelp : return EntryHelp , nil case tType : return EntryType , nil case tUnit : m := yoloString ( p . l . b [ p . offsets [ 0 ] : p . offsets [ 1 ] ] ) u := yoloString ( p . text ) if len ( u ) > 0 { if ! strings . HasSuffix ( m , u ) || len ( m ) < len ( u ) + 1 || p . l . b [ p . offsets [ 1 ] - len ( u ) - 1 ] != '_' { return EntryInvalid , errors . Errorf ( " " , m ) } } return EntryUnit , nil } case tMName : p . offsets = append ( p . offsets , p . l . i ) p . series = p . l . b [ p . start : p . l . i ] t2 := p . nextToken ( ) if t2 == tBraceOpen { if err := p . parseLVals ( ) ; err != nil { return EntryInvalid , err } p . series = p . l . b [ p . start : p . l . i ] t2 = p . nextToken ( ) } if t2 != tValue { return EntryInvalid , parseError ( " " , t ) } if p . val , err = strconv . ParseFloat ( yoloString ( p . l . buf ( ) [ 1 : ] ) , 64 ) ; err != nil { return EntryInvalid , err } // Ensure canonical NaN value. if math . IsNaN ( p . val ) { p . val = math . Float64frombits ( value . NormalNaN ) } p . hasTS = false switch p . nextToken ( ) { case tLinebreak : break case tTimestamp : p . hasTS = true var ts float64 // A float is enough to hold what we need for millisecond resolution. if ts , err = strconv . ParseFloat ( yoloString ( p . l . buf ( ) [ 1 : ] ) , 64 ) ; err != nil { return EntryInvalid , err } p . ts = int64 ( ts * 1000 ) if t2 := p . nextToken ( ) ; t2 != tLinebreak { return EntryInvalid , parseError ( " " , t ) } default : return EntryInvalid , parseError ( " " , t ) } return EntrySeries , nil default : err = errors . Errorf ( " " , t , string ( p . l . cur ( ) ) ) } return EntryInvalid , err }
// Next advances the parser to the next sample. It returns false if no
// more samples were read or an error occurred.
Next advances the parser to the next sample . It returns false if no more samples were read or an error occurred .