Should only be called inside an operation.
| public peekOperationName ( ) : string | ||
| return | string | the next operation name or NULL if no next operation found. |
/**
* {@inheritdoc}
*
* @param FlowQuery $flowQuery the FlowQuery object
* @param array $arguments the filter expression to use (in index 0)
* @return void
* @throws FizzleException
*/
public function evaluate(FlowQuery $flowQuery, array $arguments)
{
if (count($flowQuery->getContext()) === 0) {
return;
}
if (!isset($arguments[0]) || empty($arguments[0])) {
if ($flowQuery->peekOperationName() === 'filter') {
$filterOperation = $flowQuery->popOperation();
if (count($filterOperation['arguments']) === 0 || empty($filterOperation['arguments'][0])) {
throw new FizzleException('Filter() needs arguments if it follows an empty children(): children().filter()', 1332489382);
}
$selectorAndFilter = $filterOperation['arguments'][0];
} else {
throw new FizzleException('children() needs at least a Property Name filter specified, or must be followed by filter().', 1332489399);
}
} else {
$selectorAndFilter = $arguments[0];
}
$parsedFilter = FizzleParser::parseFilterGroup($selectorAndFilter);
if (count($parsedFilter['Filters']) === 0) {
throw new FizzleException('filter needs to be specified in children()', 1332489416);
} elseif (count($parsedFilter['Filters']) === 1) {
$filter = $parsedFilter['Filters'][0];
if (isset($filter['PropertyNameFilter'])) {
$this->evaluatePropertyNameFilter($flowQuery, $filter['PropertyNameFilter']);
if (isset($filter['AttributeFilters'])) {
foreach ($filter['AttributeFilters'] as $attributeFilter) {
$flowQuery->pushOperation('filter', [$attributeFilter['text']]);
}
}
} elseif (isset($filter['AttributeFilters'])) {
throw new FizzleException('children() must have a property name filter and cannot only have an attribute filter.', 1332489432);
}
} else {
throw new FizzleException('children() only supports a single filter group right now, i.e. nothing of the form "filter1, filter2"', 1332489489);
}
}