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functions.go
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functions.go
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package script
import (
"fmt"
"reflect"
)
type Function struct {
Name string
Args []Argument
Returns Value
Block func()
}
type Argument struct {
Name string
Value
}
type Variable string
func (q Ctx) dummyFunc(function interface{}, strings ...string) (func(), []reflect.Value) {
var FunctionType = reflect.TypeOf(function)
var Original = reflect.ValueOf(function)
var NumberOfArguments = FunctionType.NumIn()
//Define the function body by passing dummy arguments with their expected locations.
var DummyArgs = make([]reflect.Value, NumberOfArguments)
for i := 0; i < NumberOfArguments; i++ {
var ArgumentName = Variable(fmt.Sprintf("arg_%v", i))
if len(strings)-1 > i {
ArgumentName = Variable(strings[i+1])
}
var Pointer = reflect.New(FunctionType.In(0))
DummyArgs[i] = Pointer.Elem()
q.New(Pointer.Interface().(EmptyType))
DummyArgs[i].FieldByName("Type").Set(reflect.ValueOf(Type{
Ctx: q,
Runtime: q.Language.Argument(string(ArgumentName), i),
}))
}
return func() {
Original.Call(DummyArgs)
}, DummyArgs
}
//DefineFunc defines a new function from a *func(...) ...
func (q Ctx) DefineFunc(function interface{}, strings ...string) {
var FunctionType = reflect.TypeOf(function).Elem()
var FunctionValue = reflect.ValueOf(function).Elem()
var NumberOfArguments = FunctionType.NumIn()
var FunctionName = q.ID("function_")
if len(strings) > 0 {
FunctionName = strings[0]
}
var f, DummyArgs = q.dummyFunc(reflect.ValueOf(function).Elem().Interface(), strings...)
var Args = make([]Argument, NumberOfArguments)
for i, arg := range DummyArgs {
Args[i].Name = fmt.Sprintf("arg_%v", i)
if len(strings)-1 > i {
Args[i].Name = strings[i+1]
}
Args[i].Value = arg.Interface().(Value)
}
var Returns Value = nil
if FunctionType.NumOut() > 0 {
Returns = reflect.New(FunctionType.Out(0)).Elem().Interface().(Value)
}
q.Language.DefineFunction(Function{
Name: FunctionName,
Args: Args,
Returns: Returns,
Block: f,
})
FunctionValue.Set(reflect.MakeFunc(FunctionType,
func(ActualArgs []reflect.Value) (returns []reflect.Value) {
var Args = make([]Value, NumberOfArguments)
for i, arg := range ActualArgs {
Args[i] = arg.Interface().(Value)
}
if Returns == nil {
q.Language.RunFunction(FunctionName, Args)
return
}
var NewReturns = reflect.New(FunctionType.Out(0)).Elem()
NewReturns.FieldByName("Type").Set(reflect.ValueOf(
Type{
Ctx: q,
Runtime: q.Language.CallFunction(FunctionName, Args),
},
))
return []reflect.Value{
NewReturns,
}
}))
}
func (q Ctx) Return(v ...Value) {
if len(v) == 0 {
q.Language.Return(nil)
return
}
q.Language.Return(v[0])
}