function invoke()
{
if (!$this->enable) {
if ($this->application->trace) {
$this->application['log']->debug("{$this->inspect()} is not enabled");
}
return;
}
if (!$this->reenable and $this->application['invocation_chain']->has($this)) {
return;
}
if (!$this->application->forceRun and !$this->isNeeded()) {
$this->application->trace and $this->application['log']->debug("Skipping {$this->inspect()}");
return;
}
$this->application['invocation_chain']->push($this);
if ($this->application->trace) {
$this->application['log']->debug("Invoke {$this->inspect()}");
}
$app = $this->application;
itertools\walk(itertools\filter(itertools\to_iterator($this->prerequisites), function ($p) use($app) {
return $app->taskDefined((string) $p);
}), function ($p) use($app) {
$app['tasks'][(string) $p]->invoke();
});
if ($this->prerequisites !== null) {
$this->prerequisites->rewind();
}
$this->execute();
$this->reenable = false;
}
function testWalk()
{
$a = itertools\xrange(1, 7);
$numbers = array();
itertools\walk($a, function ($number) use(&$numbers) {
$numbers[] = $number;
});
$this->assertEquals(range(1, 7), $numbers);
}
function each($callback, $context = null)
{
if ($context !== null and $callback instanceof \Closure) {
$callback = \Closure::bind($callback, $context);
}
$iterator = $this->getIterator();
itertools\walk($iterator, $callback);
return $this;
}