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view core/lib/Drupal/Core/Asset/JsCollectionGrouper.php @ 19:fa3358dc1485 tip
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author | Chris Cannam |
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date | Wed, 28 Aug 2019 13:14:47 +0100 |
parents | 4c8ae668cc8c |
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<?php namespace Drupal\Core\Asset; /** * Groups JavaScript assets. */ class JsCollectionGrouper implements AssetCollectionGrouperInterface { /** * {@inheritdoc} * * Puts multiple items into the same group if they are groupable and if they * are for the same browsers. Items of the 'file' type are groupable if their * 'preprocess' flag is TRUE. Items of the 'external' type are not groupable. * * Also ensures that the process of grouping items does not change their * relative order. This requirement may result in multiple groups for the same * type and browsers, if needed to accommodate other items in between. */ public function group(array $js_assets) { $groups = []; // If a group can contain multiple items, we track the information that must // be the same for each item in the group, so that when we iterate the next // item, we can determine if it can be put into the current group, or if a // new group needs to be made for it. $current_group_keys = NULL; $index = -1; foreach ($js_assets as $item) { // The browsers for which the JavaScript item needs to be loaded is part // of the information that determines when a new group is needed, but the // order of keys in the array doesn't matter, and we don't want a new // group if all that's different is that order. ksort($item['browsers']); switch ($item['type']) { case 'file': // Group file items if their 'preprocess' flag is TRUE. // Help ensure maximum reuse of aggregate files by only grouping // together items that share the same 'group' value. $group_keys = $item['preprocess'] ? [$item['type'], $item['group'], $item['browsers']] : FALSE; break; case 'external': // Do not group external items. $group_keys = FALSE; break; } // If the group keys don't match the most recent group we're working with, // then a new group must be made. if ($group_keys !== $current_group_keys) { $index++; // Initialize the new group with the same properties as the first item // being placed into it. The item's 'data' and 'weight' properties are // unique to the item and should not be carried over to the group. $groups[$index] = $item; unset($groups[$index]['data'], $groups[$index]['weight']); $groups[$index]['items'] = []; $current_group_keys = $group_keys ? $group_keys : NULL; } // Add the item to the current group. $groups[$index]['items'][] = $item; } return $groups; } }