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<?php declare(strict_types=1); |
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/** |
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* Query |
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* |
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* SQL Query Builder / Database Abstraction Layer |
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* |
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* PHP version 7.1 |
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* |
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* @package Query |
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* @author Timothy J. Warren <[email protected]> |
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* @copyright 2012 - 2018 Timothy J. Warren |
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* @license http://www.opensource.org/licenses/mit-license.html MIT License |
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* @link https://git.timshomepage.net/aviat4ion/Query |
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*/ |
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namespace Query; |
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use Query\Drivers\DriverInterface; |
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/** |
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* Utility Class to parse sql clauses for properly escaping identifiers |
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*/ |
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class QueryParser { |
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/** |
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* DB Driver |
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* |
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* @var DriverInterface |
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*/ |
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private $db; |
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/** |
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* Regex patterns for various syntax components |
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* |
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* @var array |
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*/ |
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private $matchPatterns = [ |
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'function' => '([a-zA-Z0-9_]+\((.*?)\))', |
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'identifier' => '([a-zA-Z0-9_-]+\.?)+', |
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'operator' => '=|AND|&&?|~|\|\|?|\^|/|>=?|<=?|-|%|OR|\+|NOT|\!=?|<>|XOR' |
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]; |
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/** |
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* Regex matches |
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* |
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* @var array |
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*/ |
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public $matches = [ |
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'functions' => [], |
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'identifiers' => [], |
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'operators' => [], |
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'combined' => [], |
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]; |
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/** |
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* Constructor/entry point into parser |
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* |
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* @param DriverInterface $db |
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*/ |
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public function __construct(DriverInterface $db) |
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{ |
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$this->db = $db; |
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} |
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/** |
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* Parser method for setting the parse string |
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* |
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* @param string $sql |
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* @return array |
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*/ |
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public function parseJoin(string $sql): array |
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{ |
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// Get sql clause components |
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preg_match_all('`'.$this->matchPatterns['function'].'`', $sql, $this->matches['functions'], PREG_SET_ORDER); |
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preg_match_all('`'.$this->matchPatterns['identifier'].'`', $sql, $this->matches['identifiers'], PREG_SET_ORDER); |
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preg_match_all('`'.$this->matchPatterns['operator'].'`', $sql, $this->matches['operators'], PREG_SET_ORDER); |
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// Get everything at once for ordering |
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$fullPattern = '`'.$this->matchPatterns['function'].'+|'.$this->matchPatterns['identifier'].'|('.$this->matchPatterns['operator'].')+`i'; |
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preg_match_all($fullPattern, $sql, $this->matches['combined'], PREG_SET_ORDER); |
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// Go through the matches, and get the most relevant matches |
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$this->matches = array_map([$this, 'filterArray'], $this->matches); |
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return $this->matches; |
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} |
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/** |
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* Compiles a join condition after parsing |
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* |
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* @param string $condition |
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* @return string |
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*/ |
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public function compileJoin(string $condition): string |
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{ |
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$parts = $this->parseJoin($condition); |
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$count = count($parts['identifiers']); |
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// Go through and quote the identifiers |
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for($i=0; $i <= $count; $i++) |
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{ |
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if (in_array($parts['combined'][$i], $parts['identifiers']) && ! is_numeric($parts['combined'][$i])) |
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{ |
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$parts['combined'][$i] = $this->db->quoteIdent($parts['combined'][$i]); |
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} |
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} |
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return implode('', $parts['combined']); |
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} |
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/** |
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* Returns a more useful match array |
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* |
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* @param array $array |
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* @return array |
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*/ |
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protected function filterArray(array $array): array |
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{ |
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$newArray = []; |
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foreach($array as $row) |
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{ |
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$newArray[] = (is_array($row)) ? $row[0] : $row; |
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} |
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return $newArray; |
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} |
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} |
aviat4ion /
Query
