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<?php |
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namespace Darya\Storage; |
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/** |
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* Sorts record sets using an array-based syntax. |
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* |
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* For sorting in-memory storage. |
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* |
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* @author Chris Andrew <[email protected]> |
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*/ |
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class Sorter |
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{ |
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/** |
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* Normalize the given sorting order array. |
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* |
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* @param array $order |
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* @return array |
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*/ |
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protected static function normalizeOrder(array $order = array()) |
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{ |
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$result = array(); |
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foreach ($order as $key => $value) { |
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if (!is_string($key)) { |
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$result[$value] = 'asc'; |
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continue; |
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} |
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$result[$key] = strtolower($value); |
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} |
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return $result; |
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} |
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/** |
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* Prepare the given sorting order. |
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* |
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* @param array|string $order |
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* @return array |
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*/ |
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protected static function prepareOrder($order) |
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{ |
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if (is_array($order)) { |
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return static::normalizeOrder($order); |
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} |
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if (!is_string($order)) { |
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return array(); |
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} |
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return array($order => 'asc'); |
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} |
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/** |
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* Sort data using the given order. |
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* |
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* Uses indexes to retain order of equal elements - stable sorting. |
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* |
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* @param array $data |
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* @param array|string $order [optional] |
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* @return array |
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*/ |
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public function sort(array $data, $order = array()) |
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{ |
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$order = $this->prepareOrder($order); |
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if (empty($order)) { |
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return $data; |
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} |
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$index = 0; |
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foreach ($data as &$item) { |
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$item = array($index++, $item); |
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} |
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usort($data, function ($a, $b) use ($order) { |
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foreach ($order as $field => $direction) { |
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if (!isset($a[1][$field]) || !isset($b[1][$field])) { |
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continue; |
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} |
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$result = strnatcasecmp($a[1][$field], $b[1][$field]); |
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if ($result === 0) { |
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continue; |
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} |
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if ($direction === 'desc') { |
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return $result - $result * 2; |
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} |
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return $result; |
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} |
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return $a[0] - $b[0]; |
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}); |
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foreach ($data as &$item) { |
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$item = $item[1]; |
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} |
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return $data; |
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} |
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} |
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darya /
framework
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