Online PHP editor | rfc for DJQ41

@ 2013-01-11T12:25:55Z

<?php

function decorate(callable $fn, callable $decorator)
{
	$wrapper = $decorator();

    return function() use ($fn, $wrapper) {
        $gen = $wrapper();

        // Only call the wrapped function if the decorator made "yield"
        if (!$gen instanceof \Generator) {
            return;
        }

        // Use the yielded arguments, forward all if none given.
        if (is_array($gen->current())) {
            $arguments = $gen->current();
        } else {
            $arguments = func_get_args();
        }

        // Forward all throwed Exceptions
        try {
            // Send the decorated function's return value into the
            // decorator as return value of "yield"
        	$gen->send(call_user_func_array($fn, $arguments));
        } catch (\Exception $e) {
            $gen->throw($e);
        }
    };
}

function foo($bar)
{
    throw new Exception("Error $bar!");
}

function catch_all_exceptions()
{
    return function() {
        try {
            (yield);
        } catch (\Exception $e) {
            echo "catch_all_exceptions: Caught Exception: $e\n";
        }
    };
}

function do_something_before()
{
    return function() {
        echo "Before!\n";
        yield;
    };
}

$foo = decorate(decorate("foo", "catch_all_exceptions"), "do_something_before");
$foo("bar");

Output for git.master, git.master_jit, rfc.property-hooks: Before! catch_all_exceptions: Caught Exception: Exception: Error bar! in /in/DJQ41:35 Stack trace: #0 /in/DJQ41(26): foo('bar') #1 /in/DJQ41(26): {closure}('bar') #2 /in/DJQ41(58): {closure}('bar') #3 {main}

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