type_conversions.go

package internal

import (
	"fmt"
	"strconv"
)

func ToString(value interface{}) (string, error) {
	switch v := value.(type) {
	case string:
		return v, nil
	case []byte:
		return string(v), nil
	case int:
		return strconv.FormatInt(int64(v), 10), nil
	case int8:
		return strconv.FormatInt(int64(v), 10), nil
	case int16:
		return strconv.FormatInt(int64(v), 10), nil
	case int32:
		return strconv.FormatInt(int64(v), 10), nil
	case int64:
		return strconv.FormatInt(v, 10), nil
	case uint:
		return strconv.FormatUint(uint64(v), 10), nil
	case uint8:
		return strconv.FormatUint(uint64(v), 10), nil
	case uint16:
		return strconv.FormatUint(uint64(v), 10), nil
	case uint32:
		return strconv.FormatUint(uint64(v), 10), nil
	case uint64:
		return strconv.FormatUint(v, 10), nil
	case float32:
		return strconv.FormatFloat(float64(v), 'f', -1, 32), nil
	case float64:
		return strconv.FormatFloat(v, 'f', -1, 64), nil
	case bool:
		return strconv.FormatBool(v), nil
	case fmt.Stringer:
		return v.String(), nil
	case nil:
		return "", nil
	}
	return "", fmt.Errorf("type \"%T\" unsupported", value)
}

func ToFloat64(value interface{}) (float64, error) {
	switch v := value.(type) {
	case string:
		return strconv.ParseFloat(v, 64)
	case []byte:
		return strconv.ParseFloat(string(v), 64)
	case fmt.Stringer:
		return strconv.ParseFloat(v.String(), 64)
	case bool:
		if v {
			return float64(1), nil
		}
		return float64(0), nil
	case int:
		return float64(v), nil
	case int8:
		return float64(v), nil
	case int16:
		return float64(v), nil
	case int32:
		return float64(v), nil
	case int64:
		return float64(v), nil
	case uint:
		return float64(v), nil
	case uint8:
		return float64(v), nil
	case uint16:
		return float64(v), nil
	case uint32:
		return float64(v), nil
	case uint64:
		return float64(v), nil
	case float32:
		return float64(v), nil
	case float64:
		return v, nil
	case nil:
		return 0, nil
	}
	return 0, fmt.Errorf("type \"%T\" unsupported", value)
}

func ToInt64(value interface{}) (int64, error) {
	switch v := value.(type) {
	case string:
		return strconv.ParseInt(v, 10, 64)
	case []byte:
		return strconv.ParseInt(string(v), 10, 64)
	case fmt.Stringer:
		return strconv.ParseInt(v.String(), 10, 64)
	case bool:
		if v {
			return int64(1), nil
		}
		return int64(0), nil
	case int:
		return int64(v), nil
	case int8:
		return int64(v), nil
	case int16:
		return int64(v), nil
	case int32:
		return int64(v), nil
	case int64:
		return v, nil
	case uint:
		return int64(v), nil
	case uint8:
		return int64(v), nil
	case uint16:
		return int64(v), nil
	case uint32:
		return int64(v), nil
	case uint64:
		return int64(v), nil
	case float32:
		return int64(v), nil
	case float64:
		return int64(v), nil
	case nil:
		return 0, nil
	}
	return 0, fmt.Errorf("type \"%T\" unsupported", value)
}

func ToUint64(value interface{}) (uint64, error) {
	switch v := value.(type) {
	case string:
		return strconv.ParseUint(v, 10, 64)
	case []byte:
		return strconv.ParseUint(string(v), 10, 64)
	case fmt.Stringer:
		return strconv.ParseUint(v.String(), 10, 64)
	case bool:
		if v {
			return uint64(1), nil
		}
		return uint64(0), nil
	case int:
		return uint64(v), nil
	case int8:
		return uint64(v), nil
	case int16:
		return uint64(v), nil
	case int32:
		return uint64(v), nil
	case int64:
		return uint64(v), nil
	case uint:
		return uint64(v), nil
	case uint8:
		return uint64(v), nil
	case uint16:
		return uint64(v), nil
	case uint32:
		return uint64(v), nil
	case uint64:
		return v, nil
	case float32:
		return uint64(v), nil
	case float64:
		return uint64(v), nil
	case nil:
		return 0, nil
	}
	return 0, fmt.Errorf("type \"%T\" unsupported", value)
}

func ToBool(value interface{}) (bool, error) {
	switch v := value.(type) {
	case string:
		return strconv.ParseBool(v)
	case []byte:
		return strconv.ParseBool(string(v))
	case fmt.Stringer:
		return strconv.ParseBool(v.String())
	case int:
		return v > 0, nil
	case int8:
		return v > 0, nil
	case int16:
		return v > 0, nil
	case int32:
		return v > 0, nil
	case int64:
		return v > 0, nil
	case uint:
		return v > 0, nil
	case uint8:
		return v > 0, nil
	case uint16:
		return v > 0, nil
	case uint32:
		return v > 0, nil
	case uint64:
		return v > 0, nil
	case float32:
		return v > 0, nil
	case float64:
		return v > 0, nil
	case bool:
		return v, nil
	case nil:
		return false, nil
	}
	return false, fmt.Errorf("type \"%T\" unsupported", value)
}