public function reverseRewriteExpressionResult(ExpressionResultInterface $result)
{
/** @var ConcatenatedExpressionResult $result */
$rewritten_parts = array();
foreach ($result->getParts() as $key => $result) {
$rewritten_parts[$key] = $this->part_rewriters[$key]->reverseRewriteExpressionResult($result);
}
return new ConcatenatedExpressionResult($rewritten_parts);
}
public function parseInputStreamWithBacktracking(InputStreamInterface $input, ExpressionResultInterface $previous_result = null)
{
if ($previous_result !== null && $previous_result instanceof ConcatenatedExpressionResult === false) {
throw new \Exception("Expected " . ConcatenatedExpressionResult::class);
}
/** @var ConcatenatedExpressionResult|null $previous_result */
$position = 0;
if ($previous_result !== null) {
$part_results = array_values($previous_result->getParts());
$index = count($this->parts) - 1;
for ($i = 0; $i < count($this->parts); $i += 1) {
$position += $part_results[$i]->getLength();
}
$input->move($position);
} else {
$part_results = array_fill(0, count($this->parts), null);
$index = 0;
}
for (; $index < count($this->parts);) {
$part = $this->parts[$index];
if ($part_results[$index] !== null) {
$input->move(-$part_results[$index]->getLength());
$position -= $part_results[$index]->getLength();
}
$part_result = $part->parseInputStreamWithBacktracking($input, $part_results[$index]);
if ($part_result === null) {
if ($index === 0) {
$input->move(-$position);
return null;
}
$part_results[$index] = $part_result;
$index -= 1;
} else {
$position += $part_result->getLength();
$part_results[$index] = $part_result;
$index += 1;
}
}
$corrected_part_results = array_combine($this->key_to_index, $part_results);
return new ConcatenatedExpressionResult($corrected_part_results);
}
