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package check
import (
"bytes"
"fmt"
"reflect"
"time"
)
type compareFunc func(v1 interface{}, v2 interface{}) (bool, error)
type valueCompare struct {
Name string
Func compareFunc
Operator string
}
// v1 and v2 must have the same type
// return >0 if v1 > v2
// return 0 if v1 = v2
// return <0 if v1 < v2
// now we only support int, uint, float64, string and []byte comparison
func compare(v1 interface{}, v2 interface{}) (int, error) {
value1 := reflect.ValueOf(v1)
value2 := reflect.ValueOf(v2)
switch v1.(type) {
case int, int8, int16, int32, int64:
a1 := value1.Int()
a2 := value2.Int()
if a1 > a2 {
return 1, nil
} else if a1 == a2 {
return 0, nil
}
return -1, nil
case uint, uint8, uint16, uint32, uint64:
a1 := value1.Uint()
a2 := value2.Uint()
if a1 > a2 {
return 1, nil
} else if a1 == a2 {
return 0, nil
}
return -1, nil
case float32, float64:
a1 := value1.Float()
a2 := value2.Float()
if a1 > a2 {
return 1, nil
} else if a1 == a2 {
return 0, nil
}
return -1, nil
case string:
a1 := value1.String()
a2 := value2.String()
if a1 > a2 {
return 1, nil
} else if a1 == a2 {
return 0, nil
}
return -1, nil
case []byte:
a1 := value1.Bytes()
a2 := value2.Bytes()
return bytes.Compare(a1, a2), nil
case time.Time:
a1 := v1.(time.Time)
a2 := v2.(time.Time)
if a1.After(a2) {
return 1, nil
} else if a1.Equal(a2) {
return 0, nil
}
return -1, nil
case time.Duration:
a1 := v1.(time.Duration)
a2 := v2.(time.Duration)
if a1 > a2 {
return 1, nil
} else if a1 == a2 {
return 0, nil
}
return -1, nil
default:
return 0, fmt.Errorf("type %T is not supported now", v1)
}
}
func less(v1 interface{}, v2 interface{}) (bool, error) {
n, err := compare(v1, v2)
if err != nil {
return false, err
}
return n < 0, nil
}
func lessEqual(v1 interface{}, v2 interface{}) (bool, error) {
n, err := compare(v1, v2)
if err != nil {
return false, err
}
return n <= 0, nil
}
func greater(v1 interface{}, v2 interface{}) (bool, error) {
n, err := compare(v1, v2)
if err != nil {
return false, err
}
return n > 0, nil
}
func greaterEqual(v1 interface{}, v2 interface{}) (bool, error) {
n, err := compare(v1, v2)
if err != nil {
return false, err
}
return n >= 0, nil
}
func (v *valueCompare) Check(params []interface{}, names []string) (bool, string) {
if len(params) != 2 {
return false, fmt.Sprintf("%s needs 2 arguments", v.Name)
}
v1 := params[0]
v2 := params[1]
v1Type := reflect.TypeOf(v1)
v2Type := reflect.TypeOf(v2)
if v1Type.Kind() != v2Type.Kind() {
return false, fmt.Sprintf("%s needs two same type, but %s != %s", v.Name, v1Type.Kind(), v2Type.Kind())
}
b, err := v.Func(v1, v2)
if err != nil {
return false, fmt.Sprintf("%s check err %v", v.Name, err)
}
return b, ""
}
func (v *valueCompare) Info() *CheckerInfo {
return &CheckerInfo{
Name: v.Name,
Params: []string{"compare_one", "compare_two"},
}
}
var Less = &valueCompare{Name: "Less", Func: less, Operator: "<"}
var LessEqual = &valueCompare{Name: "LessEqual", Func: lessEqual, Operator: "<="}
var Greater = &valueCompare{Name: "Greater", Func: greater, Operator: ">"}
var GreaterEqual = &valueCompare{Name: "GreaterEqual", Func: greaterEqual, Operator: ">="}
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