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<?php |
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/** |
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* citeproc-php |
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* |
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* @link http://github.com/seboettg/citeproc-php for the source repository |
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* @copyright Copyright (c) 2016 Sebastian Böttger. |
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* @license https://opensource.org/licenses/MIT |
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*/ |
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namespace Seboettg\CiteProc\Style\Sort; |
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use Seboettg\CiteProc\Util\Variables; |
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use Seboettg\CiteProc\Util\Date; |
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use Seboettg\Collection\ArrayList; |
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/** |
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* Class Sort |
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* |
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* cs:citation and cs:bibliography may include a cs:sort child element before the cs:layout element to specify the |
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* sorting order of respectively cites within citations, and bibliographic entries within the bibliography. |
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* |
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* The cs:sort element must contain one or more cs:key child elements. The sort key, set as an attribute on cs:key, must |
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* be a variable (see Appendix IV - Variables) or macro name. For each cs:key element, the sort direction can be set to |
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* either “ascending” (default) or “descending” with the sort attribute. |
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* |
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* @package Seboettg\CiteProc\Style |
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* |
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* @author Sebastian Böttger <[email protected]> |
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*/ |
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class Sort |
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{ |
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/** |
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* ordered list contains sorting keys |
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* |
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* @var ArrayList |
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*/ |
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private $sortingKeys; |
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/** |
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* @var \SimpleXMLElement $node |
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*/ |
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public function __construct(\SimpleXMLElement $node) |
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{ |
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$this->sortingKeys = new ArrayList(); |
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/** @var \SimpleXMLElement $child */ |
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foreach ($node->children() as $child) { |
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if ("key" === $child->getName()) { |
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$this->sortingKeys->append(new Key($child)); |
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} |
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} |
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} |
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/** |
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* Function in order to sort a set of csl items by one or multiple sort keys. |
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* Sort keys are evaluated in sequence. A primary sort is performed on all items using the first sort key. |
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* A secondary sort, using the second sort key, is applied to items sharing the first sort key value. A tertiary |
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* sort, using the third sort key, is applied to items sharing the first and second sort key values. Sorting |
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* continues until either the order of all items is fixed, or until the sort keys are exhausted. Items with an |
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* empty sort key value are placed at the end of the sort, both for ascending and descending sorts. |
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* |
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* @param array $data reference |
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*/ |
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public function sort(&$data) |
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{ |
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$data = $this->performSort(0, $data); |
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} |
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/** |
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* Recursive function in order to sort a set of csl items by one or multiple sort keys. |
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* All items will be distributed by the value (defined in respective sort key) in an associative array (grouped). |
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* Afterwards the array will be sorted by the array key. If a further sort key exist, each of these groups will be |
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* sorted by a recursive function call. Finally the array will be flatted. |
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* |
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* @param $keyNumber |
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* @param $dataToSort |
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* @return array |
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*/ |
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private function performSort($keyNumber, $dataToSort) |
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{ |
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if (count($dataToSort) < 2) { |
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return $dataToSort; |
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} |
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/** @var Key $key */ |
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$key = $this->sortingKeys->get($keyNumber); |
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$variable = $key->getVariable(); |
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$groupedItems = []; |
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//grouping by value |
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foreach ($dataToSort as $dataItem) { |
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if ($key->isNameVariable()) { |
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$groupedItems[Variables::nameHash($dataItem, $variable)][] = $dataItem; |
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} |
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if ($key->isNumberVariable()) { |
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$groupedItems[$dataItem->{$variable}][] = $dataItem; |
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} |
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if ($key->isDateVariable()) { |
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$groupedItems[Date::serializeDate($dataItem->{$variable})][] = $dataItem; |
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} |
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} |
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// there are further keys ? |
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if ($this->sortingKeys->count() > ++$keyNumber) { |
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array_walk($groupedItems, function(&$group) use ($keyNumber){ |
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$group = $this->performSort($keyNumber, $group); //recursive call for next sort key |
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}); |
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} |
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//sorting by array keys |
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if ($key->getSort() === "ascending") { |
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ksort($groupedItems); //ascending |
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} else { |
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krsort($groupedItems); //reverse |
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} |
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//the flattened array is the result |
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$sortedDataGroups = array_values($groupedItems); |
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return $this->flatten($sortedDataGroups); |
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} |
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public function flatten(array $array) { |
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$returnArray = []; |
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array_walk_recursive($array, function($a) use (&$returnArray) { $returnArray[] = $a; }); |
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return $returnArray; |
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} |
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/** |
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* @return ArrayList |
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*/ |
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public function getSortingKeys() |
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{ |
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return $this->sortingKeys; |
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} |
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} |
seboettg /
citeproc-php
