/**
* Execute loop until *as.break()* is called
* @param callable $func loop body callable( as )
* @param string $label optional label to use for *as.break()* and *as.continue()* in inner loops
*/
public function loop(callable $func, $label = null)
{
$this->_sanityCheck();
$loop_state = new \StdClass();
$loop_state->model_as = new \FutoIn\RI\AsyncSteps();
$loop_state->inner_as = null;
$loop_state->outer_as = null;
$loop_state->func = $func;
$loop_state->label = $label;
$this->add(function ($outer_as) use($loop_state) {
$loop_state->outer_as = $outer_as;
$create_iteration = function () use($outer_as, $loop_state) {
$inner_as = new \FutoIn\RI\AsyncSteps($outer_as->state());
$inner_as->copyFrom($loop_state->model_as);
$loop_state->inner_as = $inner_as;
$inner_as->execute();
};
$loop_state->model_as->add(function ($as) use($loop_state) {
$func = $loop_state->func;
$func($as);
}, function ($as, $err) use($loop_state) {
if ($err === \FutoIn\Error::LoopCont) {
$label = $loop_state->label;
$term_label = $as->state()->_loop_term_label;
if ($term_label && $term_label !== $label) {
// Unroll loops continue
\FutoIn\RI\AsyncTool::callLater(function () use($loop_state, $term_label) {
try {
$loop_state->outer_as->continueLoop($term_label);
} catch (\Exception $e) {
}
});
} else {
$as->success();
return;
}
} elseif ($err === \FutoIn\Error::LoopBreak) {
$label = $loop_state->label;
$term_label = $as->state()->_loop_term_label;
if ($term_label && $term_label !== $label) {
// Unroll loops and break
\FutoIn\RI\AsyncTool::callLater(function () use($loop_state, $term_label) {
try {
$loop_state->outer_as->breakLoop($term_label);
} catch (\Exception $e) {
}
});
} else {
// Continue linear execution
\FutoIn\RI\AsyncTool::callLater(function () use($loop_state, $term_label) {
try {
$loop_state->outer_as->success();
} catch (\Exception $e) {
}
});
}
} else {
\FutoIn\RI\AsyncTool::callLater(function () use($loop_state, $err) {
try {
$loop_state->outer_as->error($err);
} catch (\Exception $e) {
}
});
}
$loop_state->model_as->cancel();
$loop_state->model_as = null;
$loop_state->func = null;
})->add(function ($as) use($create_iteration) {
\FutoIn\RI\AsyncTool::callLater($create_iteration);
});
$outer_as->setCancel(function ($as) use($loop_state) {
$loop_state->inner_as->cancel();
$loop_state->inner_as = null;
if ($loop_state->model_as) {
$loop_state->model_as->cancel();
$loop_state->model_as = null;
}
$loop_state->func = null;
});
$create_iteration();
});
return $this;
}
