protected function setupReferenceType(Reference $reference)
{
$result = preg_match('#^(0|[1-9]\\d*)$#u', $reference->getKey());
PregHelper::assertMatchResult($result, RegExpException::class, "Regular expression error on reference type detection");
if (1 === $result) {
$type = Reference::TYPE_INDEX;
} elseif ('-' == $reference->getKey()) {
$type = Reference::TYPE_NEXT_INDEX;
} else {
$type = Reference::TYPE_PROPERTY;
}
$reference->setType($type);
return $this;
}
/**
* Checks if text at current cursor position starts from token of given type.
*
* @param int $type
* @return string|null Token text or NULL.
* @todo Split method in two.
*/
protected function matchTokenTextAtCursor(int $type)
{
$result = preg_match($this->getTokenPattern($type), $this->getTextAtCursor(), $matches);
PregHelper::assertMatchResult($result, RegExpException::class, "Failed to match token text due to regular expression error");
if (1 === $result) {
$text = $matches[0];
if (strlen($text) == 0) {
throw new LengthException("Matched token text is empty");
}
} else {
$text = null;
}
return $text;
}