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<?php |
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namespace Mouf\Database\TDBM; |
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use Doctrine\Common\Cache\Cache; |
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use PHPSQLParser\PHPSQLParser; |
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/** |
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* Class in charge of analyzing order by clauses. |
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* |
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* Analyzing those clauses are important because an order by clause must be pushed into the select clause too. |
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*/ |
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class OrderByAnalyzer |
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{ |
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/** |
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* The content of the cache variable. |
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* |
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* @var Cache |
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*/ |
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private $cache; |
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/** |
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* @var string |
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*/ |
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private $cachePrefix; |
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/** |
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* OrderByAnalyzer constructor. |
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* @param Cache $cache |
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* @param string|null $cachePrefix |
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*/ |
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public function __construct(Cache $cache, $cachePrefix = null) |
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{ |
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$this->cache = $cache; |
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$this->cachePrefix = $cachePrefix; |
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} |
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/** |
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* Returns an array for each sorted "column" in the form: |
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* |
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* [ |
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* [ |
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* 'type' => 'colref', |
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* 'table' => null, |
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* 'column' => 'a', |
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* 'direction' => 'ASC' |
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* ], |
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* [ |
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* 'type' => 'expr', |
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* 'expr' => 'RAND()', |
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* 'direction' => 'DESC' |
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* ] |
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* ] |
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* |
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* @param string $orderBy |
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* @return array |
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*/ |
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public function analyzeOrderBy(string $orderBy) : array |
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{ |
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$key = $this->cachePrefix.'_order_by_analysis_'.$orderBy; |
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$results = $this->cache->fetch($key); |
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if ($results !== false) { |
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return $results; |
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} |
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$results = $this->analyzeOrderByNoCache($orderBy); |
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$this->cache->save($key, $results); |
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return $results; |
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} |
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private function analyzeOrderByNoCache(string $orderBy) : array |
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{ |
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$sqlParser = new PHPSQLParser(); |
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$sql = 'SELECT 1 FROM a ORDER BY '.$orderBy; |
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$parsed = $sqlParser->parse($sql, true); |
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$results = []; |
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for ($i = 0, $count = count($parsed['ORDER']); $i < $count; $i++) { |
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$orderItem = $parsed['ORDER'][$i]; |
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if ($orderItem['expr_type'] === 'colref') { |
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$parts = $orderItem['no_quotes']['parts']; |
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$columnName = array_pop($parts); |
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if (!empty($parts)) { |
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$tableName = array_pop($parts); |
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} else { |
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$tableName = null; |
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} |
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$results[] = [ |
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'type' => 'colref', |
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'table' => $tableName, |
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'column' => $columnName, |
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'direction' => $orderItem['direction'] |
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]; |
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} else { |
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$position = $orderItem['position']; |
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if ($i+1 < $count) { |
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$nextPosition = $parsed['ORDER'][$i+1]['position']; |
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$str = substr($sql, $position, $nextPosition - $position); |
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} else { |
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$str = substr($sql, $position); |
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} |
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$str = trim($str, " \t\r\n,"); |
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$results[] = [ |
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'type' => 'expr', |
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'expr' => $this->trimDirection($str), |
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'direction' => $orderItem['direction'] |
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]; |
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} |
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} |
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return $results; |
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} |
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/** |
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* Trims the ASC/DESC direction at the end of the string. |
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* |
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* @param string $sql |
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* @return string |
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*/ |
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private function trimDirection(string $sql) : string |
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{ |
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preg_match('/^(.*)(\s+(DESC|ASC|))*$/Ui', $sql, $matches); |
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return $matches[1]; |
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} |
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} |
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thecodingmachine /
database.tdbm
