/
UnionProcessor.php
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/
UnionProcessor.php
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<?php
/**
* UnionProcessor.php
*
* This file implements the processor for the UNION statements.
*
* Copyright (c) 2010-2012, Justin Swanhart
* with contributions by André Rothe <arothe@phosco.info, phosco@gmx.de>
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
* SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*/
require_once(dirname(__FILE__) . '/AbstractProcessor.php');
require_once(dirname(__FILE__) . '/SQLProcessor.php');
require_once(dirname(__FILE__) . '/DefaultProcessor.php');
require_once(dirname(__FILE__) . '/../utils/ExpressionType.php');
/**
*
* This class processes the UNION statements.
*
* @author arothe
*
*/
class UnionProcessor extends AbstractProcessor {
public static function isUnion($queries) {
$unionTypes = array('UNION', 'UNION ALL');
foreach ($unionTypes as $unionType) {
if (!empty($queries[$unionType])) {
return true;
}
}
return false;
}
/**
* MySQL supports a special form of UNION:
* (select ...)
* union
* (select ...)
*
* This function handles this query syntax. Only one such subquery
* is supported in each UNION block. (select)(select)union(select) is not legal.
* The extra queries will be silently ignored.
*/
protected function processMySQLUnion($queries) {
$unionTypes = array('UNION', 'UNION ALL');
foreach ($unionTypes as $unionType) {
if (empty($queries[$unionType])) {
continue;
}
foreach ($queries[$unionType] as $key => $tokenList) {
foreach ($tokenList as $z => $token) {
$token = trim($token);
if ($token === "") {
continue;
}
// starts with "(select"
if (preg_match("/^\\(\\s*select\\s*/i", $token)) {
$processor = new DefaultProcessor();
$queries[$unionType][$key] = $processor->process($this->removeParenthesisFromStart($token));
break;
}
$processor = new SQLProcessor();
$queries[$unionType][$key] = $processor->process($queries[$unionType][$key]);
break;
}
}
}
// it can be parsed or not
return $queries;
}
public function process($inputArray) {
$outputArray = array();
// ometimes the parser needs to skip ahead until a particular
// oken is found
$skipUntilToken = false;
// his is the last type of union used (UNION or UNION ALL)
// ndicates a) presence of at least one union in this query
// b) the type of union if this is the first or last query
$unionType = false;
// ometimes a "query" consists of more than one query (like a UNION query)
// his array holds all the queries
$queries = array();
foreach ($inputArray as $key => $token) {
$trim = trim($token);
// overread all tokens till that given token
if ($skipUntilToken) {
if ($trim === "") {
continue; // read the next token
}
if (strtoupper($trim) === $skipUntilToken) {
$skipUntilToken = false;
continue; // read the next token
}
}
if (strtoupper($trim) !== "UNION") {
$outputArray[] = $token; // here we get empty tokens, if we remove these, we get problems in parse_sql()
continue;
}
$unionType = "UNION";
// we are looking for an ALL token right after UNION
for ($i = $key + 1; $i < count($inputArray); ++$i) {
if (trim($inputArray[$i]) === "") {
continue;
}
if (strtoupper($inputArray[$i]) !== "ALL") {
break;
}
// the other for-loop should overread till "ALL"
$skipUntilToken = "ALL";
$unionType = "UNION ALL";
}
// store the tokens related to the unionType
$queries[$unionType][] = $outputArray;
$outputArray = array();
}
// the query tokens after the last UNION or UNION ALL
// or we don't have an UNION/UNION ALL
if (!empty($outputArray)) {
if ($unionType) {
$queries[$unionType][] = $outputArray;
} else {
$queries[] = $outputArray;
}
}
return $this->processMySQLUnion($queries);
}
}
?>