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UnionProcessor.php
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/
UnionProcessor.php
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<?php
/**
* WhereProcessor.php
*
* This file implements the processor for the UNION statements.
*
* PHP version 5
*
* LICENSE:
* Copyright (c) 2010-2014 Justin Swanhart and André Rothe
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*
* @author André Rothe <andre.rothe@phosco.info>
* @copyright 2010-2014 Justin Swanhart and André Rothe
* @license http://www.debian.org/misc/bsd.license BSD License (3 Clause)
* @version SVN: $Id$
*
*/
namespace PHPSQLParser\processors;
/**
* This class processes the UNION statements.
*
* @author André Rothe <andre.rothe@phosco.info>
* @license http://www.debian.org/misc/bsd.license BSD License (3 Clause)
*
*/
class UnionProcessor extends AbstractProcessor {
protected function processDefault($token) {
$processor = new DefaultProcessor($this->options);
return $processor->process($token);
}
protected function processSQL($token) {
$processor = new SQLProcessor($this->options);
return $processor->process($token);
}
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)) {
$queries[$unionType][$key] = $this->processDefault($this->removeParenthesisFromStart($token));
break;
}
$queries[$unionType][$key] = $this->processSQL($queries[$unionType][$key]);
break;
}
}
}
// it can be parsed or not
return $queries;
}
/**
* Moves the final union query into a separate output, so the remainder (such as ORDER BY) can
* be processed separately.
*/
protected function splitUnionRemainder($queries, $unionType, $outputArray)
{
$finalQuery = [];
//If this token contains a matching pair of brackets at the start and end, use it as the final query
foreach ($outputArray as $key => $token) {
$tokenAsArray = str_split(trim($token));
$keyCount = max(array_keys($tokenAsArray));
if (($tokenAsArray[0] == '(' && $tokenAsArray[$keyCount] == ')')) {
$queries[$unionType][] = $outputArray;
unset($outputArray[$key]);
break;
} elseif (strtoupper($token) == 'ORDER') {
break;
} else {
$finalQuery[] = $token;
unset($outputArray[$key]);
}
}
$finalQueryString = trim(implode($finalQuery));
if (!empty($finalQuery) && $finalQueryString != '') {
$queries[$unionType][] = $finalQuery;
}
$defaultProcessor = new DefaultProcessor($this->options);
$rePrepareSqlString = trim(implode($outputArray));
if (!empty($rePrepareSqlString)) {
$remainingQueries = $defaultProcessor->process($rePrepareSqlString);
$queries[] = $remainingQueries;
}
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 = $this->splitUnionRemainder($queries, $unionType, $outputArray);
} else {
$queries[] = $outputArray;
}
}
return $this->processMySQLUnion($queries);
}
}
?>