private function parseWithPreviousResult(InputStreamInterface $input, RepeaterExpressionResult $previous_result)
{
$part_results = $previous_result->getResults();
$length = count($part_results);
if ($length > 0) {
//we can backtrack the previous result
$index = $length - 1;
$position = $previous_result->getLength() - $part_results[$index]->getLength();
$input->move($position);
$last_part = $this->inner->parseInputStreamWithBacktracking($input, $part_results[$index]);
if ($last_part !== null) {
//succesfully backtracked, replace the entry
$part_results[$index] = $last_part;
return new RepeaterExpressionResult($part_results);
}
//failed to backtrack, fallthrough and find the next entry
$input->move($part_results[$index]->getLength());
}
if ($length >= $this->maximum) {
return null;
}
$next_result = $this->inner->parseInputStreamWithBacktracking($input);
if ($next_result === null) {
$input->move(-$previous_result->getLength());
return null;
}
$part_results[] = $next_result;
return new RepeaterExpressionResult($part_results);
}
private function parseWithPreviousResult(InputStreamInterface $input, RepeaterExpressionResult $previous_result)
{
$part_results = iterator_to_array($previous_result->getResults());
$length = count($part_results);
if ($length === 0) {
return null;
}
$index = $length - 1;
//we need to backtrack the last result.
//find the position where the last entry starts
$position = $previous_result->getLength() - $part_results[$index]->getLength();
$input->move($position);
//backtrack that entry
$last_part = $this->inner->parseInputStreamWithBacktracking($input, $part_results[$index]);
if ($last_part === null) {
//it failed, our new result excludes this item. Still atleast the minimum?
if ($index < $this->minimum) {
$input->move(-$position);
return null;
}
return new RepeaterExpressionResult(new \ArrayIterator(array_slice($part_results, 0, $index)));
}
//replace the entry
$part_results[$index] = $last_part;
return new RepeaterExpressionResult(new \ArrayIterator($part_results));
}