forked from zeromicro/go-zero
/
lang.go
78 lines (70 loc) · 1.58 KB
/
lang.go
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package lang
import (
"fmt"
"reflect"
"strconv"
)
// Placeholder is a placeholder object that can be used globally.
var Placeholder PlaceholderType
type (
// AnyType can be used to hold any type.
AnyType = interface{}
// PlaceholderType represents a placeholder type.
PlaceholderType = struct{}
)
// Repr returns the string representation of v.
func Repr(v interface{}) string {
if v == nil {
return ""
}
// if func (v *Type) String() string, we can't use Elem()
switch vt := v.(type) {
case fmt.Stringer:
return vt.String()
}
val := reflect.ValueOf(v)
if val.Kind() == reflect.Ptr && !val.IsNil() {
val = val.Elem()
}
return reprOfValue(val)
}
func reprOfValue(val reflect.Value) string {
switch vt := val.Interface().(type) {
case bool:
return strconv.FormatBool(vt)
case error:
return vt.Error()
case float32:
return strconv.FormatFloat(float64(vt), 'f', -1, 32)
case float64:
return strconv.FormatFloat(vt, 'f', -1, 64)
case fmt.Stringer:
return vt.String()
case int:
return strconv.Itoa(vt)
case int8:
return strconv.Itoa(int(vt))
case int16:
return strconv.Itoa(int(vt))
case int32:
return strconv.Itoa(int(vt))
case int64:
return strconv.FormatInt(vt, 10)
case string:
return vt
case uint:
return strconv.FormatUint(uint64(vt), 10)
case uint8:
return strconv.FormatUint(uint64(vt), 10)
case uint16:
return strconv.FormatUint(uint64(vt), 10)
case uint32:
return strconv.FormatUint(uint64(vt), 10)
case uint64:
return strconv.FormatUint(vt, 10)
case []byte:
return string(vt)
default:
return fmt.Sprint(val.Interface())
}
}