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<?php |
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/** |
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* This file is part of the League.csv library |
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* |
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* @license http://opensource.org/licenses/MIT |
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* @link https://github.com/thephpleague/csv/ |
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* @version 9.0.0 |
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* @package League.csv |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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declare(strict_types=1); |
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namespace League\Csv; |
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use ArrayIterator; |
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use CallbackFilterIterator; |
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use Iterator; |
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use LimitIterator; |
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/** |
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* A trait to manage filtering a CSV |
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* |
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* @package League.csv |
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* @since 9.0.0 |
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* @author Ignace Nyamagana Butera <[email protected]> |
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* |
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*/ |
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class Statement |
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{ |
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use ValidatorTrait; |
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/** |
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* Callables to filter the iterator |
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* |
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* @var callable[] |
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*/ |
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protected $where = []; |
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/** |
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* Callables to sort the iterator |
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* |
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* @var callable[] |
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*/ |
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protected $order_by = []; |
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/** |
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* iterator Offset |
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* |
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* @var int |
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*/ |
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protected $offset = 0; |
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/** |
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* iterator maximum length |
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* |
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* @var int |
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*/ |
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protected $limit = -1; |
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/** |
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* Set the Iterator filter method |
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* |
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* @param callable $callable |
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* |
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* @return self |
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*/ |
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public function where(callable $callable): self |
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{ |
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$clone = clone $this; |
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$clone->where[] = $callable; |
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return $clone; |
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} |
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/** |
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* Set an Iterator sorting callable function |
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* |
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* @param callable $callable |
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* |
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* @return self |
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*/ |
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public function orderBy(callable $callable): self |
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{ |
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$clone = clone $this; |
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$clone->order_by[] = $callable; |
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return $clone; |
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} |
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/** |
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* Set LimitIterator Offset |
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* |
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* @param $offset |
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* |
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* @return self |
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*/ |
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public function offset(int $offset): self |
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{ |
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$offset = $this->filterMinRange($offset, 0, 'The Statement offset must be a positive integer or 0'); |
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if ($offset === $this->offset) { |
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return $this; |
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} |
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$clone = clone $this; |
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$clone->offset = $offset; |
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return $clone; |
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} |
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/** |
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* Set LimitIterator Count |
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* |
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* @param int $limit |
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* |
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* @return self |
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*/ |
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public function limit(int $limit): self |
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{ |
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$limit = $this->filterMinRange($limit, -1, 'The Statement limit must an integer greater or equals to -1'); |
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if ($limit === $this->limit) { |
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return $this; |
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} |
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$clone = clone $this; |
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$clone->limit = $limit; |
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return $clone; |
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} |
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/** |
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* Returns the inner CSV Document Iterator object |
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* |
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* @param Reader $reader |
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* |
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* @return RecordSet |
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*/ |
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public function process(Reader $reader): RecordSet |
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{ |
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$reducer = function (Iterator $iterator, callable $callable): Iterator { |
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return new CallbackFilterIterator($iterator, $callable); |
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}; |
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$iterator = array_reduce($this->where, $reducer, $reader->getIterator()); |
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$iterator = $this->buildOrderBy($iterator); |
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$iterator = new LimitIterator($iterator, $this->offset, $this->limit); |
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return new RecordSet($iterator, $reader->getHeader()); |
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} |
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/** |
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* Sort the Iterator |
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* |
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* @param Iterator $iterator |
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* |
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* @return Iterator |
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*/ |
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protected function buildOrderBy(Iterator $iterator): Iterator |
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{ |
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if (empty($this->order_by)) { |
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return $iterator; |
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} |
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$compare = function (array $record_a, array $record_b): int { |
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foreach ($this->order_by as $callable) { |
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if (0 !== ($cmp = $callable($record_a, $record_b))) { |
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return $cmp; |
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} |
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} |
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return $cmp ?? 0; |
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1 |
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}; |
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$iterator = new ArrayIterator(iterator_to_array($iterator)); |
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$iterator->uasort($compare); |
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return $iterator; |
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} |
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} |
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thephpleague /
csv
