github.com/kaydxh/golang@v0.0.131/go/utils/compare.go (about)

     1  /*
     2   *Copyright (c) 2022, kaydxh
     3   *
     4   *Permission is hereby granted, free of charge, to any person obtaining a copy
     5   *of this software and associated documentation files (the "Software"), to deal
     6   *in the Software without restriction, including without limitation the rights
     7   *to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     8   *copies of the Software, and to permit persons to whom the Software is
     9   *furnished to do so, subject to the following conditions:
    10   *
    11   *The above copyright notice and this permission notice shall be included in all
    12   *copies or substantial portions of the Software.
    13   *
    14   *THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    15   *IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    16   *FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    17   *AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    18   *LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    19   *OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
    20   *SOFTWARE.
    21   */
    22  package utils
    23  
    24  import (
    25  	"fmt"
    26  	"reflect"
    27  )
    28  
    29  type Comparable interface {
    30  	Equals(a, b interface{}) bool
    31  }
    32  
    33  type Comparator interface {
    34  	Compare(a, b interface{}) int
    35  }
    36  
    37  func CheckComparableTypes(objs ...interface{}) bool {
    38  	for _, obj := range objs {
    39  		if !CheckComparableType(obj) {
    40  			return false
    41  		}
    42  	}
    43  
    44  	return true
    45  }
    46  
    47  func CheckComparableType(a interface{}) bool {
    48  	switch reflect.ValueOf(a).Kind() {
    49  	case reflect.Array, reflect.Slice, reflect.Struct, reflect.Map:
    50  		return false
    51  
    52  	default:
    53  		return true
    54  	}
    55  }
    56  
    57  // object (a or b) that contains members that has equality defined will
    58  // have equality defined or die.
    59  func Equal(a, b interface{}) (bool, error) {
    60  	if !CheckComparableTypes(a, b) {
    61  		_, ok := a.(Comparable)
    62  		if !ok {
    63  			return false, fmt.Errorf("not support compare type: %v", reflect.ValueOf(a).Kind())
    64  
    65  		}
    66  		_, ok = b.(Comparable)
    67  		if !ok {
    68  			return false, fmt.Errorf("not support compare type: %v", reflect.ValueOf(a).Kind())
    69  
    70  		}
    71  	}
    72  	if a == nil || b == nil {
    73  		return a == b, nil
    74  	}
    75  	v1 := reflect.ValueOf(a)
    76  	v2 := reflect.ValueOf(b)
    77  	if v1.Type() != v2.Type() {
    78  		return false, nil
    79  	}
    80  
    81  	return a == b, nil
    82  }
    83  
    84  func DeepEqual(a, b interface{}) bool {
    85  	return reflect.DeepEqual(a, b)
    86  }
    87  
    88  func Compare(a, b interface{}, compare Comparator) int {
    89  
    90  	return compare.Compare(a, b)
    91  }