func appendField()

in metric/metric.go [474:546]

• 67 lines of code
• 19 McCabe index (conditional complexity)

func appendField(b []byte, k string, v interface{}) []byte {
	if v == nil {
		return b
	}
	b = append(b, []byte(escape(k, "tagkey")+"=")...)

	// check popular types first
	switch v := v.(type) {
	case float64:
		b = strconv.AppendFloat(b, v, 'f', -1, 64)
	case int64:
		b = strconv.AppendInt(b, v, 10)
		b = append(b, 'i')
	case string:
		b = append(b, '"')
		b = append(b, []byte(escape(v, "fieldval"))...)
		b = append(b, '"')
	case bool:
		b = strconv.AppendBool(b, v)
	case int32:
		b = strconv.AppendInt(b, int64(v), 10)
		b = append(b, 'i')
	case int16:
		b = strconv.AppendInt(b, int64(v), 10)
		b = append(b, 'i')
	case int8:
		b = strconv.AppendInt(b, int64(v), 10)
		b = append(b, 'i')
	case int:
		b = strconv.AppendInt(b, int64(v), 10)
		b = append(b, 'i')
	case uint64:
		// Cap uints above the maximum int value
		var intv int64
		if v <= uint64(MaxInt) {
			intv = int64(v)
		} else {
			intv = int64(MaxInt)
		}
		b = strconv.AppendInt(b, intv, 10)
		b = append(b, 'i')
	case uint32:
		b = strconv.AppendInt(b, int64(v), 10)
		b = append(b, 'i')
	case uint16:
		b = strconv.AppendInt(b, int64(v), 10)
		b = append(b, 'i')
	case uint8:
		b = strconv.AppendInt(b, int64(v), 10)
		b = append(b, 'i')
	case uint:
		// Cap uints above the maximum int value
		var intv int64
		if v <= uint(MaxInt) {
			intv = int64(v)
		} else {
			intv = int64(MaxInt)
		}
		b = strconv.AppendInt(b, intv, 10)
		b = append(b, 'i')
	case float32:
		b = strconv.AppendFloat(b, float64(v), 'f', -1, 32)
	case []byte:
		b = append(b, v...)
	default:
		// Can't determine the type, so convert to string
		b = append(b, '"')
		b = append(b, []byte(escape(fmt.Sprintf("%v", v), "fieldval"))...)
		b = append(b, '"')
	}

	return b
}