Nested scope
- Intent
- Create a composable runtime hierarchy of data and behaviour
- Motivation
- We want dynamic means of modifying complex runtime structures
- Implementation
- Use php magic to dynamically dispatch requests to parent methods
- Examples
class scope {
var $parent;
function __call( $name ) {
if(isset($parent[$name]) { return $parent[$name](); }
throw( new someException() );
}
function let( $name, $value ) {
if(is_object($value)) {
//hygiene
if(isset($this->$name)) { $this->$name->parent = null; }
$this->$name = $value;
$this->$name->parent = $this;
}
}
//alternative let
function let($parent, $name, $class) {
$parent->$name = new $class();
$parent->$name->parent = array($parent,$name);
}
?>
- Notes
- A concept related to and very often mistaken (mixed) (by me) with (for) closures
- the let method can be folded into __set if we want this behaviour to the default for assignments to object fields
