138 lines
3.2 KiB
PHP
138 lines
3.2 KiB
PHP
<?php
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/**
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* Query
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*
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* Free Query Builder / Database Abstraction Layer
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*
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* @package Query
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* @author Timothy J. Warren
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* @copyright Copyright (c) 2012 - 2015
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* @link https://github.com/aviat4ion/Query
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* @license http://philsturgeon.co.uk/code/dbad-license
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*/
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// --------------------------------------------------------------------------
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namespace Query;
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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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* @package Query
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* @subpackage Query_Builder
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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 $match_patterns = [
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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 Driver\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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/**
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* Parser method for setting the parse string
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*
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* @param string $sql
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* @return array
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*/
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public function parse_join($sql)
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{
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// Get sql clause components
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preg_match_all('`'.$this->match_patterns['function'].'`', $sql, $this->matches['functions'], PREG_SET_ORDER);
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preg_match_all('`'.$this->match_patterns['identifier'].'`', $sql, $this->matches['identifiers'], PREG_SET_ORDER);
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preg_match_all('`'.$this->match_patterns['operator'].'`', $sql, $this->matches['operators'], PREG_SET_ORDER);
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// Get everything at once for ordering
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$full_pattern = '`'.$this->match_patterns['function'].'+|'.$this->match_patterns['identifier'].'|('.$this->match_patterns['operator'].')+`i';
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preg_match_all($full_pattern, $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, 'filter_array'], $this->matches);
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return $this->matches;
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}
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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 $condition
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* @return string
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*/
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public function compile_join($condition)
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{
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$parts = $this->parse_join($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] = $this->db->quote_ident($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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/**
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* Returns a more useful match array
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*
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* @param array $array
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* @return array
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*/
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protected function filter_array($array)
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{
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$new_array = [];
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foreach($array as $row)
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{
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$new_array[] = (is_array($row)) ? $row[0] : $row;
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}
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return $new_array;
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}
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}
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// End of QueryParser.php
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