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comparator.go
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comparator.go
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package collect
import (
"golang.org/x/exp/constraints"
"math"
"reflect"
)
func IsNumber(v any) bool {
switch v.(type) {
case int, int8, int16, int32, int64, uint, uint8, uint16, uint32, uint64, float32, float64:
return true
default:
return false
}
}
func NumberCompare[T constraints.Integer | constraints.Float](a T, operator string, b T) bool {
switch operator {
case "=", "!=":
var eq bool
switch av := any(a).(type) {
case float64:
if math.IsNaN(av) && math.IsNaN(any(b).(float64)) {
eq = true
} else {
eq = math.Abs(av-any(b).(float64)) <= 1e-9
}
case float32:
eq = math.Abs(float64(av)-float64(any(b).(float32))) <= 1e-9
default:
eq = a == b
}
if operator == "=" {
return eq
} else {
return !eq
}
case "<":
return a < b
case "<=":
return a <= b
case ">":
return a > b
case ">=":
return a >= b
}
return false
}
func AnyNumberCompare(a any, operator string, b any) bool {
if a == nil || b == nil {
return false
} else if !IsNumber(a) {
return false
}
ar, br := reflect.ValueOf(a), reflect.ValueOf(b)
switch true {
case ar.CanInt():
if !br.CanInt() {
return operator != "="
}
return NumberCompare(ar.Int(), operator, br.Int())
case ar.CanUint():
if !br.CanUint() {
return operator != "="
}
return NumberCompare(ar.Uint(), operator, br.Uint())
case ar.CanFloat():
if !br.CanFloat() {
return operator != "="
}
return NumberCompare(ar.Float(), operator, br.Float())
}
return false
}
func Compare(a any, operator string, b any) bool {
if a == nil && b == nil {
return operator == "="
} else if a == nil || b == nil {
return operator != "="
}
if IsNumber(a) || IsNumber(b) {
return AnyNumberCompare(a, operator, b)
} else if operator != "=" && operator != "!=" {
return false
}
ar, br := reflect.TypeOf(a), reflect.TypeOf(b)
ak, bk := ar.Kind(), br.Kind()
if ak != bk {
return operator == "!="
}
if ak != reflect.Slice && ak != reflect.Map && ak != reflect.Func {
switch operator {
case "=":
return a == b
case "!=":
return a != b
}
}
p := reflect.ValueOf(a).UnsafePointer()
switch operator {
case "=":
return p == reflect.ValueOf(b).UnsafePointer()
case "!=":
return p != reflect.ValueOf(b).UnsafePointer()
}
return false
}
type ComparisonSet struct {
LooseNumber bool
z map[any]map[reflect.Kind]struct{}
}
func (c *ComparisonSet) Normalize(v reflect.Value) (reflect.Kind, any) {
kind := v.Kind()
if kind == reflect.Slice || kind == reflect.Func || kind == reflect.Map {
return kind, v.UnsafePointer()
}
if c.LooseNumber {
switch true {
case v.CanInt():
return reflect.Int64, v.Int()
case v.CanUint():
return reflect.Uint64, v.Uint()
case v.CanFloat():
return reflect.Float64, v.Float()
}
}
return kind, v.Interface()
}
func (c *ComparisonSet) Add(v any) {
kind, value := c.Normalize(reflect.ValueOf(v))
if _, ok := c.z[value]; !ok {
c.z[value] = make(map[reflect.Kind]struct{})
}
c.z[value][kind] = struct{}{}
}
func (c *ComparisonSet) Has(v any) bool {
kind, value := c.Normalize(reflect.ValueOf(v))
if m, ok := c.z[value]; ok {
_, ok := m[kind]
return ok
}
return false
}
func NewComparisonSet(looseNumber bool) *ComparisonSet {
return &ComparisonSet{looseNumber, make(map[any]map[reflect.Kind]struct{})}
}