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<?php
namespace Snilius\Twig;
use Exception;
/**
* User: Victor Häggqvist
* Date: 3/4/15
* Time: 2:07 AM
*
* The base of the filter is borrowed from https://github.com/dannynimmo/craftcms-sortbyfield
*
* I have extended it to also sort array structures
*/
class SortByFieldExtension extends \Twig_Extension {
public function getName() {
return 'sortbyfield';
}
public function getFilters() {
return array(
new \Twig_SimpleFilter('sortbyfield', array($this, 'sortByFieldFilter'))
);
}
/**
* The "sortByField" filter sorts an array of entries (objects or arrays) by the specified field's value
*
* Usage: {% for entry in master.entries|sortbyfield('ordering', 'desc') %}
*/
public function sortByFieldFilter($content, $sort_by = null, $direction = 'asc') {
if (!is_array($content)) {
throw new \InvalidArgumentException('Variable passed to the sortByField filter is not an array');
} elseif ($sort_by === null) {
throw new Exception('No sort by parameter passed to the sortByField filter');
} elseif (!self::isSortable($content[0], $sort_by)) {
throw new Exception('Entries passed to the sortByField filter do not have the field "' . $sort_by . '"');
} else {
// Unfortunately have to suppress warnings here due to __get function
// causing usort to think that the array has been modified:
// usort(): Array was modified by the user comparison function
@usort($content, function ($a, $b) use($sort_by, $direction) {
$flip = ($direction === 'desc') ? -1 : 1;
if (is_array($a))
$a_sort_value = $a[$sort_by];
else
$a_sort_value = $a->$sort_by;
if (is_array($b))
$b_sort_value = $b[$sort_by];
else
$b_sort_value = $b->$sort_by;
if($a_sort_value == $b_sort_value) {
return 0;
} else if($a_sort_value > $b_sort_value) {
return (1 * $flip);
} else {
return (-1 * $flip);
}
});
}
return $content;
}
/**
* Validate the passed $item to check if it can be sorted
* @param $item mixed Collection item to be sorted
* @param $field string
* @return bool If collection item can be sorted
*/
private static function isSortable($item, $field) {
if (is_array($item))
return array_key_exists($field, $item);
elseif (is_object($item))
return property_exists($item, $field);
else
return false;
}
}
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