func (self *Ident) Eval(env *scope.Scope) value.Value {
if obj := env.Lookup(self.Name, true); obj != nil {
//fmt.Println(reflect.TypeOf(obj.Data))
return obj.Data.(value.Value)
}
return nil
}
// This is a set manipulation.
func (self *Define) Eval(env *scope.Scope) value.Value {
fmt.Println("Define#Eval")
var_ := self.var_.(*Ident)
val := self.expr.Eval(env)
env.Insert(var_.Name, scope.NewObj(val))
// Define does not have return val.
return nil
}
// This is a set manipulation.
func (self *Set) Eval(env *scope.Scope) value.Value {
fmt.Println("Set#Eval")
var_ := self.var_.(*Ident)
val := self.expr.Eval(env)
if obj := env.Lookup(var_.Name, true); obj == nil {
panic("set!: assignment disallowed.")
}
env.Insert(var_.Name, scope.NewObj(val))
// Define does not have return val.
return nil
}