addons

Package addons provides easier access to common iolang types and constants.

This package copies some types and constants to make iolang addons much less verbose. To use it, do import . "github.com/zephyrtronium/iolang/addons". CFunction definitions can then look like this:

func Foo(vm *VM, target, locals *Object, msg *Message) *Object {
	x, stop := msg.EvalArgAt(vm, locals, 0)
	if stop != NoStop {
		return vm.Stop(x, stop)
	}
	// ...
	return foo
}

instead of this:

func Foo(vm *iolang.VM, target, locals *iolang.Object, msg *iolang.Message) *iolang.Object {
	x, stop := msg.EvalArgAt(vm, locals, 0)
	if stop != iolang.NoStop {
		return vm.Stop(x, stop)
	}
	// ...
	return foo
}

The following iolang types are aliased:

• Object
• Slots
• Stop
• VM
• Message
• Exception

Additionally, the Stop constants for serial control flow are copied:

• NoStop
• ContinueStop
• BreakStop
• ReturnStop
• ExceptionStop
• ExitStop

See the Range addon at iolang/addons/range for an example of how and why to use this.