Query/src/QueryParser.php

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<?php declare(strict_types=1);
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/**
* Query
*
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* SQL Query Builder / Database Abstraction Layer
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*
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* PHP version 7.2
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*
* @package Query
* @author Timothy J. Warren <tim@timshomepage.net>
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* @copyright 2012 - 2020 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
* @version 3.0.0
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*/
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namespace Query;
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use Query\Drivers\DriverInterface;
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/**
* Utility Class to parse sql clauses for properly escaping identifiers
*/
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class QueryParser {
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/**
* DB Driver
*
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* @var DriverInterface
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*/
private $db;
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/**
* Regex patterns for various syntax components
*
* @var array
*/
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private $matchPatterns = [
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'function' => '([a-zA-Z0-9_]+\((.*?)\))',
'identifier' => '([a-zA-Z0-9_-]+\.?)+',
'operator' => '=|AND|&&?|~|\|\|?|\^|/|>=?|<=?|-|%|OR|\+|NOT|\!=?|<>|XOR'
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];
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/**
* Regex matches
*
* @var array
*/
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public $matches = [
'functions' => [],
'identifiers' => [],
'operators' => [],
'combined' => [],
];
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/**
* Constructor/entry point into parser
*
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* @param DriverInterface $db
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*/
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public function __construct(DriverInterface $db)
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{
$this->db = $db;
}
/**
* Parser method for setting the parse string
*
* @param string $sql
* @return array
*/
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public function parseJoin(string $sql): array
{
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// Get sql clause components
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preg_match_all('`'.$this->matchPatterns['function'].'`', $sql, $this->matches['functions'], PREG_SET_ORDER);
preg_match_all('`'.$this->matchPatterns['identifier'].'`', $sql, $this->matches['identifiers'], PREG_SET_ORDER);
preg_match_all('`'.$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'].'|('.$this->matchPatterns['operator'].')+`i';
preg_match_all($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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/**
* Compiles a join condition after parsing
*
* @param string $condition
* @return string
*/
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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']);
// Go through and quote the identifiers
for($i=0; $i <= $count; $i++)
{
if (in_array($parts['combined'][$i], $parts['identifiers']) && ! is_numeric($parts['combined'][$i]))
{
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$parts['combined'][$i] = $this->db->quoteIdent($parts['combined'][$i]);
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}
}
return implode('', $parts['combined']);
}
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/**
* Returns a more useful match array
*
* @param array $array
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* @return array
*/
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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 $row)
{
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$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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}