102 lines
2.5 KiB
PHP
102 lines
2.5 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 - 2014
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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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/**
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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 Query_Parser {
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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 = array(
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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 = array(
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'functions' => array(),
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'identifiers' => array(),
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'operators' => array(),
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'combined' => array(),
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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 string $sql
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*/
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public function __construct($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(array($this, 'filter_array'), $this->matches);
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}
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// --------------------------------------------------------------------------
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/**
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* Public parser method for seting the parse string
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*
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* @param string $sql
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*/
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public function parse_join($sql)
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{
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$this->__construct($sql);
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return $this->matches;
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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 $array
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* @return array
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*/
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private function filter_array($array)
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{
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$new_array = array();
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foreach($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 query_parser.php
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