Cascade operator

cascade.macro.sjs

/*

```
foo
  ..method()
  ..property = value
  ..method()
```

*/

macro function_arguments {
	rule { ($arg:expr (,) ...) }
}

let . = macro {
	rule infix { $expression:expr | . $symbol:ident $arguments:function_arguments } => {
		(function (ref) {
			return ref . $symbol $arguments , ref;
		}($expression))
	}
	rule infix { $expression:expr | . $symbol:ident = $value } => {
		(function (ref) {
			return ref . $symbol = $value , ref;
		}($expression))
	}
	rule { $rest ... } => { . $rest ... }
}

export .;