protected static function _definition($reference, $callLine) {
		if (file_exists($reference)) {
			foreach (array_reverse(token_get_all(file_get_contents($reference))) as $token) {
				if (!is_array($token) || $token[2] > $callLine) {
					continue;
				}
				if ($token[0] === T_FUNCTION) {
					return $token[2];
				}
			}
			return;
		}
		list($class,) = explode('::', $reference);

		if (!class_exists($class)) {
			return;
		}

		$classRef = new ReflectionClass($class);
		$methodInfo = Inspector::info($reference);
		$methodDef = join("\n", Inspector::lines($classRef->getFileName(), range(
			$methodInfo['start'] + 1, $methodInfo['end'] - 1
		)));

		foreach (array_reverse(token_get_all("<?php {$methodDef} ?>")) as $token) {
			if (!is_array($token) || $token[2] > $callLine) {
				continue;
			}
			if ($token[0] === T_FUNCTION) {
				return $token[2] + $methodInfo['start'];
			}
		}
	}