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von raredesign | Dez 3, 2019 | Allgemein | 0 Kommentare

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--TEST--
Closure 041: Rebinding: preservation of previous scope when not given as arg unless impossible
--FILE--
<?php

/* It's impossible to preserve the previous scope when doing so would break
 * the invariants that, for non-static closures, having a scope is equivalent
 * to having a bound instance. */

$staticUnscoped = static function () {
	echo "scoped to A: "; var_dump(isset(A::$priv));
	echo "bound: ", isset($this)?get_class($this):"no";
};

$nonstaticUnscoped = function () {
	echo "scoped to A: "; var_dump(isset(A::$priv));
	echo "bound: ", isset($this)?get_class($this):"no";
};

class A {
	private static $priv = 7;
	function getClosure() {
		return function () {
			echo "scoped to A: "; var_dump(isset(A::$priv));
			echo "bound: ", isset($this)?get_class($this):"no";
		};
	}
	function getStaticClosure() {
		return static function () {
			echo "scoped to A: "; var_dump(isset(A::$priv));
			echo "bound: ", isset($this)?get_class($this):"no";
		};
	}
}
class B extends A {}

$a = new A();
$staticScoped = $a->getStaticClosure();
$nonstaticScoped = $a->getClosure();

echo "Before binding", "\n";
$staticUnscoped(); echo "\n";
$nonstaticUnscoped(); echo "\n";
$staticScoped(); echo "\n";
$nonstaticScoped(); echo "\n";

echo "After binding, no instance", "\n";
$d = $staticUnscoped->bindTo(null); $d(); echo "\n";
$d = $nonstaticUnscoped->bindTo(null); $d(); echo "\n";
$d = $staticScoped->bindTo(null); $d(); echo "\n";
$d = $nonstaticScoped->bindTo(null); $d(); echo "\n";
// $d is still non-static
$d->bindTo($d);

echo "After binding, with same-class instance for the bound ones", "\n";
$d = $staticUnscoped->bindTo(new A);
$d = $nonstaticUnscoped->bindTo(new A); $d(); echo " (should be scoped to dummy class)\n";
$d = $staticScoped->bindTo(new A);
$d = $nonstaticScoped->bindTo(new A); $d(); echo "\n";

echo "After binding, with different instance for the bound ones", "\n";
$d = $nonstaticUnscoped->bindTo(new B); $d(); echo " (should be scoped to dummy class)\n";
$d = $nonstaticScoped->bindTo(new B); $d(); echo "\n";

echo "Done.\n";

--EXPECTF--
Before binding
scoped to A: bool(false)
bound: no
scoped to A: bool(false)
bound: no
scoped to A: bool(true)
bound: no
scoped to A: bool(true)
bound: A
After binding, no instance
scoped to A: bool(false)
bound: no
scoped to A: bool(false)
bound: no
scoped to A: bool(true)
bound: no
scoped to A: bool(true)
bound: no
After binding, with same-class instance for the bound ones

Warning: Cannot bind an instance to a static closure in %s on line %d
scoped to A: bool(false)
bound: A (should be scoped to dummy class)

Warning: Cannot bind an instance to a static closure in %s on line %d
scoped to A: bool(true)
bound: A
After binding, with different instance for the bound ones
scoped to A: bool(false)
bound: B (should be scoped to dummy class)
scoped to A: bool(true)
bound: B
Done.

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