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tengo-func.go
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tengo-func.go
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package tgx
import (
"github.com/d5/tengo/v2"
"reflect"
)
func (tgw *TengoX) bindFunc(fn *tengo.UserFunction, funcVarPtr interface{}) {
dest := reflect.ValueOf(funcVarPtr).Elem()
fnType := dest.Type()
dest.Set(reflect.MakeFunc(fnType, tgw.wrapFunc(fn, fnType)))
}
func (tgw *TengoX) wrapFunc(fn *tengo.UserFunction, fnType reflect.Type) func(args []reflect.Value) (results []reflect.Value) {
return func(args []reflect.Value) (results []reflect.Value) {
// make tengo args
var tgArgs []tengo.Object
lastNumIn := fnType.NumIn() - 1
variadic := fnType.IsVariadic()
for i, arg := range args {
if i < lastNumIn || !variadic {
tgArg, _ := tengo.FromInterface(arg.Interface())
tgArgs = append(tgArgs, tgArg)
continue
}
if arg.IsZero() {
break
}
varLen := arg.Len()
for j:=0; j<varLen; j++ {
tgArg, _ := tengo.FromInterface(arg.Index(j).Interface())
tgArgs = append(tgArgs, tgArg)
}
}
// call tengo function
res, err := fn.Call(tgArgs...)
// convert result to golang
results = make([]reflect.Value, fnType.NumOut())
if err == nil {
if fnType.NumOut() > 0 {
if res.TypeName() == "array" {
mRes := res.(*tengo.Array)
n := fnType.NumOut()
for i:=0; i<n; i++ {
v := reflect.New(fnType.Out(i)).Elem()
rv, err := mRes.IndexGet(&tengo.Int{Value: int64(i)})
if err != nil {
break
}
if err = setValue(v, tengo.ToInterface(rv)); err == nil {
results[i] = v
}
}
} else {
v := reflect.New(fnType.Out(0)).Elem()
rv := tengo.ToInterface(res)
if err = setValue(v, rv); err == nil {
results[0] = v
}
}
}
}
if err != nil {
nOut := fnType.NumOut()
if nOut > 0 && fnType.Out(nOut-1).Name() == "error" {
results[nOut-1] = reflect.ValueOf(err).Convert(fnType.Out(nOut-1))
} else {
panic(err)
}
}
for i, v := range results {
if !v.IsValid() {
results[i] = reflect.Zero(fnType.Out(i))
}
}
return
}
}
func (tgw *TengoX) callFunc(fn *tengo.UserFunction, args ...interface{}) (res tengo.Object, err error) {
tgArgs := make([]tengo.Object, len(args))
for i, arg := range args {
tgArgs[i], _ = tengo.FromInterface(arg)
}
return fn.Call(tgArgs...)
}