/
eval.go
255 lines (244 loc) · 7.02 KB
/
eval.go
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package GoFastExpress
import (
"errors"
"fmt"
"reflect"
)
//取值
func EvalTakes(argNode ArgNode, arg interface{}) (interface{}, error) {
if arg == nil || argNode.values == nil {
return nil, nil
}
if argNode.value == "" || argNode.valuesLen == 0 {
return arg, nil
}
var av = reflect.ValueOf(arg)
if av.Kind() == reflect.Map {
var m = arg.(map[string]interface{})
if argNode.valuesLen == 1 {
return m[argNode.value], nil
}
return takeValue(argNode.value, av.MapIndex(reflect.ValueOf(argNode.values[0])), argNode.values[1:])
} else {
if argNode.valuesLen == 1 {
return arg, nil
}
return takeValue(argNode.value, av, argNode.values[1:])
}
}
func takeValue(key string, arg reflect.Value, feilds []string) (interface{}, error) {
if arg.IsValid() == false {
return nil, nil
}
for _, v := range feilds {
argItem, e := getObjV(key, v, arg)
if e != nil || argItem == nil {
return nil, e
}
arg = *argItem
}
if !arg.IsValid() {
return nil, nil
}
if arg.CanInterface() {
var intf = arg.Interface()
return intf, nil
} else {
return nil, nil
}
}
func getObjV(key string, operator Operator, av reflect.Value) (*reflect.Value, error) {
if av.Kind() == reflect.Ptr || av.Kind() == reflect.Interface {
av = GetDeepPtr(av)
}
if av.Kind() == reflect.Map {
var mapV = av.MapIndex(reflect.ValueOf(operator))
return &mapV, nil
}
if av.Kind() != reflect.Struct {
return nil, errors.New("[express] " + key + " get value " + key + " fail :" + av.String() + ",value key:" + operator)
}
av = av.FieldByName(operator)
if av.Kind() == reflect.Ptr || av.Kind() == reflect.Interface {
av = GetDeepPtr(av)
}
if av.IsValid() && av.CanInterface() {
return &av, nil
} else {
return nil, nil
}
}
func Eval(express string, operator Operator, a interface{}, b interface{}) (interface{}, error) {
var av = reflect.ValueOf(a)
var bv = reflect.ValueOf(b)
switch operator {
case And:
if a == nil || b == nil {
//equal nil
return nil, errors.New("[express] " + express + " eval fail,value can not be nil")
}
a, av = GetDeepValue(av, a)
b, bv = GetDeepValue(bv, b)
var ab = a.(bool)
var bb = b.(bool)
return ab == true && bb == true, nil
case Or:
if a == nil || b == nil {
//equal nil
return nil, errors.New("[express] " + express + " eval fail,value can not be nil")
}
a, av = GetDeepValue(av, a)
b, bv = GetDeepValue(bv, b)
var ab = a.(bool)
var bb = b.(bool)
return ab == true || bb == true, nil
case Equal, MoreEqual, More, Less, LessEqual:
//a kind == b kind
return DoEqualAction(express, operator, a, b, av, bv)
case UnEqual:
//a kind == b kind
var r, e = DoEqualAction(express, operator, a, b, av, bv)
if e != nil {
return nil, e
}
return !r, nil
case Add, Reduce, Ride, Divide:
return DoCalculationAction(express, operator, a, b, av, bv)
}
return nil, errors.New("[express] " + express + " find not support operator :" + operator)
}
func DoEqualAction(express string, operator Operator, a interface{}, b interface{}, av reflect.Value, bv reflect.Value) (bool, error) {
switch operator {
case UnEqual:
fallthrough
case Equal:
if av.Kind() == reflect.Ptr && av.IsNil() == true {
a = nil
}
if bv.Kind() == reflect.Ptr && bv.IsNil() == true {
b = nil
}
if a == nil || b == nil {
//equal nil
if a != nil || b != nil {
return false, nil
}
if a == nil && b == nil {
return true, nil
}
}
if av.Kind() == reflect.Ptr {
a, av = GetDeepValue(av, a)
}
if bv.Kind() == reflect.Ptr {
b, bv = GetDeepValue(bv, b)
}
if av.Kind() == reflect.Float64 && bv.Kind() == reflect.Float64 {
return a.(float64) == b.(float64), nil
}
if av.Kind() == reflect.Float32 && bv.Kind() == reflect.Float32 {
return a.(float32) == b.(float32), nil
}
if av.Kind() == reflect.Int && bv.Kind() == reflect.Int {
return a.(int) == b.(int), nil
}
if av.Kind() == reflect.Int8 && bv.Kind() == reflect.Int8 {
return a.(int8) == b.(int8), nil
}
if av.Kind() == reflect.Int16 && bv.Kind() == reflect.Int16 {
return a.(int16) == b.(int16), nil
}
if av.Kind() == reflect.Int32 && bv.Kind() == reflect.Int32 {
return a.(int32) == b.(int32), nil
}
if av.Kind() == reflect.Int64 && bv.Kind() == reflect.Int64 {
return a.(int64) == b.(int64), nil
}
if av.Kind() == reflect.Bool && bv.Kind() == reflect.Bool {
return a.(bool) == b.(bool), nil
}
if av.Kind() == reflect.String && bv.Kind() == reflect.String {
return a.(string) == b.(string), nil
}
if av.Kind() == reflect.Struct && bv.Kind() == reflect.String {
return fmt.Sprint(a) == b.(string), nil
}
if bv.Kind() == reflect.Struct && av.Kind() == reflect.String {
return fmt.Sprint(b) == a.(string), nil
}
a = toNumberType(av)
b = toNumberType(bv)
return a.(float64) == b.(float64), nil
case Less:
if a == nil || b == nil {
return false, errors.New("[express] " + express + "can not parser '<' , arg have nil object!")
}
a, av = GetDeepValue(av, a)
b, bv = GetDeepValue(bv, b)
a = toNumberType(av)
b = toNumberType(bv)
return a.(float64) < b.(float64), nil
case More:
if a == nil || b == nil {
return false, errors.New("[express] " + express + "can not parser '>' , arg have nil object!")
}
a, av = GetDeepValue(av, a)
b, bv = GetDeepValue(bv, b)
a = toNumberType(av)
b = toNumberType(bv)
return a.(float64) > b.(float64), nil
case MoreEqual:
if a == nil || b == nil {
return false, errors.New("[express] " + express + "can not parser '>=' , arg have nil object!")
}
a, av = GetDeepValue(av, a)
b, bv = GetDeepValue(bv, b)
a = toNumberType(av)
b = toNumberType(bv)
return a.(float64) >= b.(float64), nil
case LessEqual:
if a == nil || b == nil {
return false, errors.New("[express] " + express + "can not parser '<=' , arg have nil object!")
}
a, av = GetDeepValue(av, a)
b, bv = GetDeepValue(bv, b)
a = toNumberType(av)
b = toNumberType(bv)
return a.(float64) <= b.(float64), nil
}
return false, errors.New("[express] " + express + " find not support equal operator :" + operator)
}
func DoCalculationAction(express string, operator Operator, a interface{}, b interface{}, av reflect.Value, bv reflect.Value) (interface{}, error) {
if a == nil || b == nil {
//equal nil
return false, errors.New("[express] " + express + " have not a action operator!")
}
//start equal
a, av = GetDeepValue(av, a)
b, bv = GetDeepValue(bv, b)
switch operator {
case Add:
if av.Kind() == reflect.String {
return a.(string) + b.(string), nil
}
a = toNumberType(av)
b = toNumberType(bv)
return a.(float64) + b.(float64), nil
case Reduce:
a = toNumberType(av)
b = toNumberType(bv)
return a.(float64) - b.(float64), nil
case Ride:
a = toNumberType(av)
b = toNumberType(bv)
return a.(float64) * b.(float64), nil
case Divide:
a = toNumberType(av)
b = toNumberType(bv)
if b.(float64) == 0 {
return nil, errors.New("[express] " + express + "can not divide zero value!")
}
return a.(float64) / b.(float64), nil
}
return "", errors.New("[express] " + express + "find not support operator :" + operator)
}