ntool/nreflect/check.go

package nreflect

import (
	"bytes"
	"reflect"
)

// HasChild type check. eg: array, slice, map, struct
func HasChild(v reflect.Value) bool {
	switch v.Kind() {
	case reflect.Array, reflect.Slice, reflect.Map, reflect.Struct:
		return true
	}
	return false
}

// IsArrayOrSlice check. eg: array, slice
func IsArrayOrSlice(k reflect.Kind) bool {
	return k == reflect.Slice || k == reflect.Array
}

// IsSimpleKind kind in: string, bool, intX, uintX, floatX
func IsSimpleKind(k reflect.Kind) bool {
	if reflect.String == k {
		return true
	}
	return k > reflect.Invalid && k <= reflect.Float64
}

// IsAnyInt check is intX or uintX type
func IsAnyInt(k reflect.Kind) bool {
	return k >= reflect.Int && k <= reflect.Uintptr
}

// IsIntx check is intX or uintX type
func IsIntx(k reflect.Kind) bool {
	return k >= reflect.Int && k <= reflect.Int64
}

// IsUintX check is intX or uintX type
func IsUintX(k reflect.Kind) bool {
	return k >= reflect.Uint && k <= reflect.Uintptr
}

// IsNil reflect value
func IsNil(v reflect.Value) bool {
	switch v.Kind() {
	case reflect.Chan, reflect.Func, reflect.Interface, reflect.Map, reflect.Ptr, reflect.Slice:
		return v.IsNil()
	default:
		return false
	}
}

// IsFunc value
func IsFunc(val any) bool {
	if val == nil {
		return false
	}
	return reflect.TypeOf(val).Kind() == reflect.Func
}

// IsEqual determines if two objects are considered equal.
//
// TIP: cannot compare function type
func IsEqual(src, dst any) bool {
	if src == nil || dst == nil {
		return src == dst
	}

	bs1, ok := src.([]byte)
	if !ok {
		return reflect.DeepEqual(src, dst)
	}

	bs2, ok := dst.([]byte)
	if !ok {
		return false
	}

	if bs1 == nil || bs2 == nil {
		return bs1 == nil && bs2 == nil
	}
	return bytes.Equal(bs1, bs2)
}

// IsEqualValues determines if two objects or two object-values are considered equal.
//
// TIP: cannot compare function type
func IsEqualValues(src, dst any) bool {
	if IsEqual(src, dst) {
		return true
	}
	dstType := reflect.TypeOf(dst)
	if dstType == nil {
		return false
	}
	srcValue := reflect.ValueOf(src)
	if srcValue.IsValid() && srcValue.Type().ConvertibleTo(dstType) {
		// Attempt comparison after type conversion
		return reflect.DeepEqual(srcValue.Convert(dstType).Interface(), dst)
	}

	return false
}

// IsEmpty reflect value check
func IsEmpty(v reflect.Value) bool {
	switch v.Kind() {
	case reflect.Invalid:
		return true
	case reflect.String, reflect.Array:
		return v.Len() == 0
	case reflect.Map, reflect.Slice:
		return v.Len() == 0 || v.IsNil()
	case reflect.Bool:
		return !v.Bool()
	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
		return v.Int() == 0
	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
		return v.Uint() == 0
	case reflect.Float32, reflect.Float64:
		return v.Float() == 0
	case reflect.Interface, reflect.Ptr, reflect.Func:
		return v.IsNil()
	}

	return reflect.DeepEqual(v.Interface(), reflect.Zero(v.Type()).Interface())
}

// IsEmptyValue reflect value check.
// Difference the IsEmpty(), if value is ptr, will check real elem.
//
// From src/pkg/encoding/json/encode.go.
func IsEmptyValue(v reflect.Value) bool {
	switch v.Kind() {
	case reflect.Array, reflect.Map, reflect.Slice, reflect.String:
		return v.Len() == 0
	case reflect.Bool:
		return !v.Bool()
	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
		return v.Int() == 0
	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
		return v.Uint() == 0
	case reflect.Float32, reflect.Float64:
		return v.Float() == 0
	case reflect.Interface, reflect.Ptr:
		if v.IsNil() {
			return true
		}
		return IsEmptyValue(v.Elem())
	case reflect.Func:
		return v.IsNil()
	case reflect.Invalid:
		return true
	}
	return false
}