140 lines
3.2 KiB
PHP
140 lines
3.2 KiB
PHP
<?php
|
|
/**
|
|
* Query
|
|
*
|
|
* Free Query Builder / Database Abstraction Layer
|
|
*
|
|
* @package Query
|
|
* @author Timothy J. Warren
|
|
* @copyright Copyright (c) 2012 - 2014
|
|
* @link https://github.com/aviat4ion/Query
|
|
* @license http://philsturgeon.co.uk/code/dbad-license
|
|
*/
|
|
|
|
// --------------------------------------------------------------------------
|
|
|
|
namespace Query;
|
|
|
|
/**
|
|
* Utility Class to parse sql clauses for properly escaping identifiers
|
|
*
|
|
* @package Query
|
|
* @subpackage Query_Builder
|
|
*/
|
|
class Query_Parser {
|
|
|
|
/**
|
|
* DB Driver
|
|
*
|
|
* @var \Query\Driver\Driver_Interface
|
|
*/
|
|
private $db;
|
|
|
|
/**
|
|
* Regex patterns for various syntax components
|
|
*
|
|
* @var array
|
|
*/
|
|
private $match_patterns = array(
|
|
'function' => '([a-zA-Z0-9_]+\((.*?)\))',
|
|
'identifier' => '([a-zA-Z0-9_-]+\.?)+',
|
|
'operator' => '=|AND|&&?|~|\|\|?|\^|/|>=?|<=?|-|%|OR|\+|NOT|\!=?|<>|XOR'
|
|
);
|
|
|
|
/**
|
|
* Regex matches
|
|
*
|
|
* @var array
|
|
*/
|
|
public $matches = array(
|
|
'functions' => array(),
|
|
'identifiers' => array(),
|
|
'operators' => array(),
|
|
'combined' => array(),
|
|
);
|
|
|
|
/**
|
|
* Constructor/entry point into parser
|
|
*
|
|
* @param string $sql
|
|
*/
|
|
public function __construct($sql = '')
|
|
{
|
|
if (is_object($sql))
|
|
{
|
|
$this->db = $sql;
|
|
$sql = '';
|
|
}
|
|
|
|
// Get sql clause components
|
|
preg_match_all('`'.$this->match_patterns['function'].'`', $sql, $this->matches['functions'], PREG_SET_ORDER);
|
|
preg_match_all('`'.$this->match_patterns['identifier'].'`', $sql, $this->matches['identifiers'], PREG_SET_ORDER);
|
|
preg_match_all('`'.$this->match_patterns['operator'].'`', $sql, $this->matches['operators'], PREG_SET_ORDER);
|
|
|
|
// Get everything at once for ordering
|
|
$full_pattern = '`'.$this->match_patterns['function'].'+|'.$this->match_patterns['identifier'].'|('.$this->match_patterns['operator'].')+`i';
|
|
preg_match_all($full_pattern, $sql, $this->matches['combined'], PREG_SET_ORDER);
|
|
|
|
// Go through the matches, and get the most relevant matches
|
|
$this->matches = array_map(array($this, 'filter_array'), $this->matches);
|
|
}
|
|
|
|
// --------------------------------------------------------------------------
|
|
|
|
/**
|
|
* Public parser method for seting the parse string
|
|
*
|
|
* @param string $sql
|
|
*/
|
|
protected function parse_join($sql)
|
|
{
|
|
$this->__construct($sql);
|
|
return $this->matches;
|
|
}
|
|
|
|
// --------------------------------------------------------------------------
|
|
|
|
/**
|
|
* Compiles a join condition after parsing
|
|
*
|
|
* @param string $condition
|
|
* @return string
|
|
*/
|
|
public function compile_join($condition)
|
|
{
|
|
$parts = $this->parse_join($condition);
|
|
$count = count($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]))
|
|
{
|
|
$parts['combined'][$i] = $this->db->quote_ident($parts['combined'][$i]);
|
|
}
|
|
}
|
|
|
|
return implode('', $parts['combined']);
|
|
}
|
|
|
|
/**
|
|
* Returns a more useful match array
|
|
*
|
|
* @param array $array
|
|
* @return array
|
|
*/
|
|
protected function filter_array($array)
|
|
{
|
|
$new_array = array();
|
|
|
|
foreach($array as $row)
|
|
{
|
|
$new_array[] = (is_array($row)) ? $row[0] : $row;
|
|
}
|
|
|
|
return $new_array;
|
|
}
|
|
|
|
}
|
|
|
|
// End of query_parser.php
|