109 lines
2.8 KiB
Plaintext
109 lines
2.8 KiB
Plaintext
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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 8.1
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*
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* @package Query
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* @author Timothy J. Warren <tim@timshome.page>
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* @copyright 2012 - 2023 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/aviat/Query
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* @version 4.0.0
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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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* Regex patterns for various syntax components
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*/
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private array $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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public array $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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public function __construct(private readonly DriverInterface $db)
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{
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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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* @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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public function compileJoin(string $condition): string
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{
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$parts = $this->parseJoin($condition);
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$count = is_countable($parts['identifiers']) ? count($parts['identifiers']) : 0;
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// Go through and quote the identifiers
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for($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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* @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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}
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