Method Bindings

common/decls/decls.go:328–418

Bindings produces a set of function bindings, if any are defined.

()

// Bindings produces a set of function bindings, if any are defined.
func (f *FunctionDecl) Bindings() ([]*functions.Overload, error) {
	var emptySet []*functions.Overload
	if f == nil {
		return emptySet, nil
	}
	overloads := []*functions.Overload{}
	nonStrict := false
	hasLateBinding := false
	for _, oID := range f.overloadOrdinals {
		o := f.overloads[oID]
		hasLateBinding = hasLateBinding || o.HasLateBinding()
		if o.HasBinding() {
			overload := &functions.Overload{
				Operator:     o.ID(),
				Unary:        o.guardedUnaryOp(f.Name(), f.disableTypeGuards),
				Binary:       o.guardedBinaryOp(f.Name(), f.disableTypeGuards),
				Function:     o.guardedFunctionOp(f.Name(), f.disableTypeGuards),
				OperandTrait: o.OperandTrait(),
				NonStrict:    o.IsNonStrict(),
			}
			overloads = append(overloads, overload)
			nonStrict = nonStrict || o.IsNonStrict()
		}
	}
	if f.singleton != nil {
		if len(overloads) != 0 {
			return nil, fmt.Errorf("singleton function incompatible with specialized overloads: %s", f.Name())
		}
		if hasLateBinding {
			return nil, fmt.Errorf("singleton function incompatible with late bindings: %s", f.Name())
		}
		overloads = []*functions.Overload{
			{
				Operator:     f.Name(),
				Unary:        f.singleton.Unary,
				Binary:       f.singleton.Binary,
				Function:     f.singleton.Function,
				OperandTrait: f.singleton.OperandTrait,
			},
		}
		// fall-through to return single overload case.
	}
	if len(overloads) == 0 {
		return overloads, nil
	}
	// Single overload. Replicate an entry for it using the function name as well.
	if len(overloads) == 1 {
		if overloads[0].Operator == f.Name() {
			return overloads, nil
		}
		return append(overloads, &functions.Overload{
			Operator:     f.Name(),
			Unary:        overloads[0].Unary,
			Binary:       overloads[0].Binary,
			Function:     overloads[0].Function,
			NonStrict:    overloads[0].NonStrict,
			OperandTrait: overloads[0].OperandTrait,
		}), nil