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package conf
import "reflect"
// OperatorsTable maps binary operators to corresponding list of functions.
// Functions should be provided in the environment to allow operator overloading.
type OperatorsTable map[string][]string
func FindSuitableOperatorOverload(fns []string, types TypesTable, l, r reflect.Type) (reflect.Type, string, bool) {
for _, fn := range fns {
fnType := types[fn]
firstInIndex := 0
if fnType.Method {
firstInIndex = 1 // As first argument to method is receiver.
}
firstArgType := fnType.Type.In(firstInIndex)
secondArgType := fnType.Type.In(firstInIndex + 1)
firstArgumentFit := l == firstArgType || (firstArgType.Kind() == reflect.Interface && (l == nil || l.Implements(firstArgType)))
secondArgumentFit := r == secondArgType || (secondArgType.Kind() == reflect.Interface && (r == nil || r.Implements(secondArgType)))
if firstArgumentFit && secondArgumentFit {
return fnType.Type.Out(0), fn, true
}
}
return nil, "", false
}
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