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