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<?php |
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/** |
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* Date: 17.05.16 |
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* |
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* @author Portey Vasil <[email protected]> |
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*/ |
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namespace Youshido\GraphQL\Relay\Connection; |
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class ArrayConnection |
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{ |
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const PREFIX = 'arrayconnection:'; |
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public static function cursorForObjectInConnection($data, $object) |
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{ |
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if (!is_array($data)) return null; |
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$index = array_search($object, $data); |
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return $index === false ? null : self::offsetToCursor($index); |
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} |
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/** |
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* @param $offset int |
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* @return string |
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*/ |
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public static function offsetToCursor($offset) |
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{ |
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return base64_encode(self::PREFIX . $offset); |
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} |
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/** |
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* @param $cursor string |
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* |
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* @return int|null |
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*/ |
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public static function cursorToOffset($cursor) |
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{ |
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if ($decoded = base64_decode($cursor)) { |
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return (int)substr($decoded, strlen(self::PREFIX)); |
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} |
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return null; |
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} |
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public static function cursorToOffsetWithDefault($cursor, $default) |
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{ |
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if (!is_string($cursor)) { |
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return $default; |
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} |
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$offset = self::cursorToOffset($cursor); |
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return is_null($offset) ? $default : $offset; |
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} |
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public static function connectionFromArray(array $data, array $args = []) |
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{ |
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return self::connectionFromArraySlice($data, $args, 0, count($data)); |
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} |
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public static function connectionFromArraySlice(array $data, array $args, $sliceStart, $arrayLength) |
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{ |
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$after = isset($args['after']) ? $args['after'] : null; |
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$before = isset($args['before']) ? $args['before'] : null; |
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$first = isset($args['first']) ? $args['first'] : null; |
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$last = isset($args['last']) ? $args['last'] : null; |
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$sliceEnd = $sliceStart + count($data); |
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$beforeOffset = ArrayConnection::cursorToOffsetWithDefault($before, $arrayLength); |
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$afterOffset = ArrayConnection::cursorToOffsetWithDefault($after, -1); |
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$startOffset = max($sliceStart - 1, $afterOffset, -1) + 1; |
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$endOffset = min($sliceEnd, $beforeOffset, $arrayLength); |
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if ($first) { |
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$endOffset = min($endOffset, $startOffset + $first); |
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} |
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if ($last) { |
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$startOffset = max($startOffset, $endOffset - $last); |
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} |
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$slice = array_slice($data, max($startOffset - $sliceStart, 0), count($data) - ($sliceEnd - $endOffset)); |
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$edges = array_map(['self', 'edgeForObjectWithIndex'], $slice, array_keys($slice)); |
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$firstEdge = array_key_exists(0, $edges) ? $edges[0] : null; |
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$lastEdge = count($edges) > 0 ? $edges[count($edges) - 1] : null; |
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$lowerBound = $after ? $afterOffset + 1 : 0; |
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$upperBound = $before ? $beforeOffset : $arrayLength; |
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return [ |
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'edges' => $edges, |
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'pageInfo' => [ |
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'startCursor' => $firstEdge ? $firstEdge['cursor'] : null, |
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'endCursor' => $lastEdge ? $lastEdge['cursor'] : null, |
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'hasPreviousPage' => $last ? $startOffset > $lowerBound : false, |
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'hasNextPage' => $first ? $endOffset < $upperBound : false |
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] |
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]; |
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} |
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public static function edgeForObjectWithIndex($object, $index) |
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{ |
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return [ |
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'cursor' => ArrayConnection::offsetToCursor($index), |
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'node' => $object |
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]; |
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} |
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} |
Youshido /
GraphQL
