niki/vendor/github.com/asaskevich/govalidator/converter.go

package govalidator

import (
	"encoding/json"
	"fmt"
	"reflect"
	"strconv"
)

// ToString convert the input to a string.

func ToString(obj interface{}) string {

	res := fmt.Sprintf("%v", obj)

	return string(res)

}

// ToJSON convert the input to a valid JSON string

func ToJSON(obj interface{}) (string, error) {

	res, err := json.Marshal(obj)

	if err != nil {

		res = []byte("")

	}

	return string(res), err

}

// ToFloat convert the input string to a float, or 0.0 if the input is not a float.

func ToFloat(str string) (float64, error) {

	res, err := strconv.ParseFloat(str, 64)

	if err != nil {

		res = 0.0

	}

	return res, err

}

// ToInt convert the input string or any int type to an integer type 64, or 0 if the input is not an integer.

func ToInt(value interface{}) (res int64, err error) {

	val := reflect.ValueOf(value)

	switch value.(type) {

	case int, int8, int16, int32, int64:

		res = val.Int()

	case uint, uint8, uint16, uint32, uint64:

		res = int64(val.Uint())

	case string:

		if IsInt(val.String()) {

			res, err = strconv.ParseInt(val.String(), 0, 64)

			if err != nil {

				res = 0

			}

		} else {

			err = fmt.Errorf("math: square root of negative number %g", value)

			res = 0

		}

	default:

		err = fmt.Errorf("math: square root of negative number %g", value)

		res = 0

	}

	return

}

// ToBoolean convert the input string to a boolean.

func ToBoolean(str string) (bool, error) {

	return strconv.ParseBool(str)

}