string.go

package to

import (
	"encoding/json"
	"fmt"
	"html/template"
	"strconv"
)

func String(v any) string {
	s, _ := Str(v)
	return s
}

func Str(v any) (string, error) {
	v = indirectToStringerOrError(v)

	switch s := v.(type) {
	case string:
		return s, nil
	case bool:
		return strconv.FormatBool(s), nil
	case float64:
		return strconv.FormatFloat(s, 'f', -1, 64), nil
	case float32:
		return strconv.FormatFloat(float64(s), 'f', -1, 32), nil
	case int:
		return strconv.Itoa(s), nil
	case int64:
		return strconv.FormatInt(s, 10), nil
	case int32:
		return strconv.Itoa(int(s)), nil
	case int16:
		return strconv.FormatInt(int64(s), 10), nil
	case int8:
		return strconv.FormatInt(int64(s), 10), nil
	case uint:
		return strconv.FormatUint(uint64(s), 10), nil
	case uint64:
		return strconv.FormatUint(s, 10), nil
	case uint32:
		return strconv.FormatUint(uint64(s), 10), nil
	case uint16:
		return strconv.FormatUint(uint64(s), 10), nil
	case uint8:
		return strconv.FormatUint(uint64(s), 10), nil
	case json.Number:
		return s.String(), nil
	case []byte:
		return string(s), nil
	case template.HTML:
		return string(s), nil
	case template.URL:
		return string(s), nil
	case template.JS:
		return string(s), nil
	case template.CSS:
		return string(s), nil
	case template.HTMLAttr:
		return string(s), nil
	case nil:
		return "", nil
	case fmt.Stringer:
		return s.String(), nil
	case error:
		return s.Error(), nil
	default:
		return "", fmt.Errorf("unable to cast %#v of type %T to string", v, v)
	}
}