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SQLProcessor.php
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SQLProcessor.php
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<?php
/**
* SQLProcessor.php
*
* This file implements the processor for the base SQL 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 base SQL statements.
*
* @author André Rothe <andre.rothe@phosco.info>
* @author Marco Th. <marco64th@gmail.com>
* @license http://www.debian.org/misc/bsd.license BSD License (3 Clause)
*
*/
class SQLProcessor extends SQLChunkProcessor {
/**
* This function breaks up the SQL statement into logical sections.
* Some sections are delegated to specialized processors.
*/
public function process($tokens) {
$prev_category = "";
$token_category = "";
$skip_next = 0;
$out = false;
// $tokens may come as a numeric indexed array starting with an index greater than 0 (or as a boolean)
$tokenCount = count($tokens);
if ( is_array($tokens) ){
$tokens = array_values($tokens);
}
for ($tokenNumber = 0; $tokenNumber < $tokenCount; ++$tokenNumber) {
$token = $tokens[$tokenNumber];
$trim = trim($token); // this removes also \n and \t!
// if it starts with an "(", it should follow a SELECT
if ($trim !== "" && $trim[0] === "(" && $token_category === "") {
$token_category = 'BRACKET';
$prev_category = $token_category;
}
/*
* If it isn't obvious, when $skip_next is set, then we ignore the next real token, that is we ignore whitespace.
*/
if ($skip_next > 0) {
if ($trim === "") {
if ($token_category !== "") { // is this correct??
$out[$token_category][] = $token;
}
continue;
}
// to skip the token we replace it with whitespace
$trim = "";
$token = "";
$skip_next--;
if ($skip_next > 0) {
continue;
}
}
$upper = strtoupper($trim);
switch ($upper) {
/* Tokens that get their own sections. These keywords have subclauses. */
case 'SELECT':
case 'ORDER':
case 'VALUES':
case 'GROUP':
case 'HAVING':
case 'WHERE':
case 'CALL':
case 'PROCEDURE':
case 'FUNCTION':
case 'SERVER':
case 'LOGFILE':
case 'DEFINER':
case 'RETURNS':
case 'TABLESPACE':
case 'TRIGGER':
case 'DO':
case 'FLUSH':
case 'KILL':
case 'RESET':
case 'STOP':
case 'PURGE':
case 'EXECUTE':
case 'PREPARE':
$token_category = $upper;
break;
case 'DEALLOCATE':
if ($trim === 'DEALLOCATE') {
$skip_next = 1;
}
$token_category = $upper;
break;
case 'DUPLICATE':
if ($token_category !== 'VALUES') {
$token_category = $upper;
}
break;
case 'SET':
if ($token_category !== 'TABLE') {
$token_category = $upper;
}
break;
case 'LIMIT':
case 'PLUGIN':
// no separate section
if ($token_category === 'SHOW') {
continue;
}
$token_category = $upper;
break;
case 'FROM':
// this FROM is different from FROM in other DML (not join related)
if ($token_category === 'PREPARE') {
continue 2;
}
// no separate section
if ($token_category === 'SHOW') {
continue;
}
$token_category = $upper;
break;
case 'EXPLAIN':
case 'DESCRIBE':
case 'SHOW':
$token_category = $upper;
break;
case 'DESC':
if ($token_category === '') {
// short version of DESCRIBE
$token_category = $upper;
}
// else direction of ORDER-BY
break;
case 'RENAME':
$token_category = $upper;
break;
case 'DATABASE':
case 'SCHEMA':
if ($prev_category === 'DROP') {
continue;
}
if ($prev_category === 'SHOW') {
continue;
}
$token_category = $upper;
break;
case 'EVENT':
// issue 71
if ($prev_category === 'DROP' || $prev_category === 'ALTER' || $prev_category === 'CREATE') {
$token_category = $upper;
}
break;
case 'DATA':
// prevent wrong handling of DATA as keyword
if ($prev_category === 'LOAD') {
$token_category = $upper;
}
break;
case 'INTO':
// prevent wrong handling of CACHE within LOAD INDEX INTO CACHE...
if ($prev_category === 'LOAD') {
$out[$prev_category][] = $trim;
continue 2;
}
$token_category = $prev_category = $upper;
break;
case 'USER':
// prevent wrong processing as keyword
if ($prev_category === 'CREATE' || $prev_category === 'RENAME' || $prev_category === 'DROP') {
$token_category = $upper;
}
break;
case 'VIEW':
// prevent wrong processing as keyword
if ($prev_category === 'CREATE' || $prev_category === 'ALTER' || $prev_category === 'DROP') {
$token_category = $upper;
}
break;
/*
* These tokens get their own section, but have no subclauses. These tokens identify the statement but have no specific subclauses of their own.
*/
case 'DELETE':
case 'ALTER':
case 'INSERT':
case 'TRUNCATE':
case 'OPTIMIZE':
case 'GRANT':
case 'REVOKE':
case 'HANDLER':
case 'LOAD':
case 'ROLLBACK':
case 'SAVEPOINT':
case 'UNLOCK':
case 'INSTALL':
case 'UNINSTALL':
case 'ANALZYE':
case 'BACKUP':
case 'CHECKSUM':
case 'REPAIR':
case 'RESTORE':
case 'HELP':
$token_category = $upper;
// set the category in case these get subclauses in a future version of MySQL
$out[$upper][0] = $trim;
continue 2;
case 'REPLACE':
if ($prev_category === '') {
// set the category in case these get subclauses in a future version of MySQL
$token_category = $upper;
$out[$upper][0] = $trim;
continue 2;
}
// part of the CREATE TABLE statement or a function
$out[$prev_category][] = $trim;
continue 2;
case 'IGNORE':
if ($prev_category === 'TABLE') {
// part of the CREATE TABLE statement
$out[$prev_category][] = $trim;
continue 2;
}
if ($token_category === 'FROM') {
// part of the FROM statement (index hint)
$out[$token_category][] = $trim;
continue 2;
}
$out['OPTIONS'][] = $upper;
continue 2;
case 'CHECK':
if ($prev_category === 'TABLE') {
$out[$prev_category][] = $trim;
continue 2;
}
$token_category = $upper;
$out[$upper][0] = $trim;
continue 2;
case 'CREATE':
if ($prev_category === 'SHOW') {
continue;
}
$token_category = $upper;
break;
case 'INDEX':
if ( in_array( $prev_category, array( 'CREATE', 'DROP' ) ) ) {
$out[ $prev_category ][] = $trim;
$token_category = $upper;
}
break;
case 'TABLE':
if ($prev_category === 'CREATE') {
$out[$prev_category][] = $trim;
$token_category = $upper;
}
if ($prev_category === 'TRUNCATE') {
$out[$prev_category][] = $trim;
$token_category = $upper;
}
break;
case 'TEMPORARY':
if ($prev_category === 'CREATE') {
$out[$prev_category][] = $trim;
$token_category = $prev_category;
continue 2;
}
break;
case 'IF':
if ($prev_category === 'TABLE') {
$token_category = 'CREATE';
$out[$token_category] = array_merge($out[$token_category], $out[$prev_category]);
$out[$prev_category] = array();
$out[$token_category][] = $trim;
$prev_category = $token_category;
continue 2;
}
break;
case 'NOT':
if ($prev_category === 'CREATE') {
$token_category = $prev_category;
$out[$prev_category][] = $trim;
continue 2;
}
break;
case 'EXISTS':
if ($prev_category === 'CREATE') {
$out[$prev_category][] = $trim;
$prev_category = $token_category = 'TABLE';
continue 2;
}
break;
case 'CACHE':
if ($prev_category === "" || $prev_category === 'RESET' || $prev_category === 'FLUSH'
|| $prev_category === 'LOAD') {
$token_category = $upper;
continue 2;
}
break;
/* This is either LOCK TABLES or SELECT ... LOCK IN SHARE MODE */
case 'LOCK':
if ($token_category === "") {
$token_category = $upper;
$out[$upper][0] = $trim;
} elseif ($token_category === 'INDEX') {
break;
} else {
$trim = 'LOCK IN SHARE MODE';
$skip_next = 3;
$out['OPTIONS'][] = $trim;
}
continue 2;
case 'USING': /* USING in FROM clause is different from USING w/ prepared statement*/
if ($token_category === 'EXECUTE') {
$token_category = $upper;
continue 2;
}
if ($token_category === 'FROM' && !empty($out['DELETE'])) {
$token_category = $upper;
continue 2;
}
break;
/* DROP TABLE is different from ALTER TABLE DROP ... */
case 'DROP':
if ($token_category !== 'ALTER') {
$token_category = $upper;
continue 2;
}
break;
case 'FOR':
if ($prev_category === 'SHOW') {
continue;
}
$skip_next = 1;
$out['OPTIONS'][] = 'FOR UPDATE'; // TODO: this could be generate problems within the position calculator
continue 2;
case 'UPDATE':
if ($token_category === "") {
$token_category = $upper;
continue 2;
}
if ($token_category === 'DUPLICATE') {
continue 2;
}
break;
case 'START':
$trim = "BEGIN";
$out[$upper][0] = $upper; // TODO: this could be generate problems within the position calculator
$skip_next = 1;
break;
// This token is ignored, except within RENAME
case 'TO':
if ($token_category === 'RENAME') {
break;
}
continue 2;
// This token is ignored, except within CREATE TABLE
case 'BY':
if ($prev_category === 'TABLE') {
break;
}
continue 2;
// These tokens are ignored.
case 'ALL':
case 'SHARE':
case 'MODE':
case ';':
continue 2;
case 'KEY':
if ($token_category === 'DUPLICATE') {
continue 2;
}
break;
/* These tokens set particular options for the statement. */
case 'LOW_PRIORITY':
case 'DELAYED':
case 'QUICK':
case 'HIGH_PRIORITY':
$out['OPTIONS'][] = $trim;
continue 2;
case 'USE':
if ($token_category === 'FROM') {
// index hint within FROM clause
$out[$token_category][] = $trim;
continue 2;
}
// set the category in case these get subclauses in a future version of MySQL
$token_category = $upper;
$out[$upper][0] = $trim;
continue 2;
case 'FORCE':
if ($token_category === 'FROM') {
// index hint within FROM clause
$out[$token_category][] = $trim;
continue 2;
}
$out['OPTIONS'][] = $trim;
continue 2;
case 'WITH':
if ($token_category === 'GROUP') {
$skip_next = 1;
$out['OPTIONS'][] = 'WITH ROLLUP'; // TODO: this could be generate problems within the position calculator
continue 2;
}
if ($token_category === '') {
$token_category = $upper;
}
break;
case 'AS':
break;
case '':
case ',':
case ';':
break;
default:
break;
}
// remove obsolete category after union (empty category because of
// empty token before select)
if ($token_category !== "" && ($prev_category === $token_category)) {
$out[$token_category][] = $token;
}
$prev_category = $token_category;
}
return parent::process($out);
}
}
?>