%PDF-
%PDF-
Mini Shell
Mini Shell
<?php
/**
* ExplainProcessor.php
*
* This file implements the processor for the EXPLAIN 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__) . '/../utils/ExpressionType.php');
/**
*
* This class processes the EXPLAIN statements.
*
* @author arothe
*
*/
class ExplainProcessor extends AbstractProcessor {
protected function isStatement($keys, $needle = "EXPLAIN") {
$pos = array_search($needle, $keys);
if (isset($keys[$pos + 1])) {
return in_array($keys[$pos + 1], array('SELECT', 'DELETE', 'INSERT', 'REPLACE', 'UPDATE'), true);
}
return false;
}
// TODO: refactor that function
public function process($tokens, $keys = array()) {
$base_expr = "";
$expr = array();
$currCategory = "";
if ($this->isStatement($keys)) {
foreach ($tokens as $token) {
$trim = trim($token);
$base_expr .= $token;
if ($trim === '') {
continue;
}
$upper = strtoupper($trim);
switch ($upper) {
case 'EXTENDED':
case 'PARTITIONS':
return array('expr_type' => ExpressionType::RESERVED, 'base_expr' => $token);
break;
case 'FORMAT':
if ($currCategory === '') {
$currCategory = $upper;
$expr[] = array('expr_type' => ExpressionType::RESERVED, 'base_expr' => $trim);
}
// else?
break;
case '=':
if ($currCategory === 'FORMAT') {
$expr[] = array('expr_type' => ExpressionType::OPERATOR, 'base_expr' => $trim);
}
// else?
break;
case 'TRADITIONAL':
case 'JSON':
if ($currCategory === 'FORMAT') {
$expr[] = array('expr_type' => ExpressionType::RESERVED, 'base_expr' => $trim);
return array('expr_type' => ExpressionType::EXPRESSION, 'base_expr' => trim($base_expr),
'sub_tree' => $expr);
}
// else?
break;
default:
// ignore the other stuff
break;
}
}
return empty($expr) ? null : $expr;
}
foreach ($tokens as $token) {
$trim = trim($token);
if ($trim === '') {
continue;
}
switch ($currCategory) {
case 'TABLENAME':
$currCategory = 'WILD';
$expr[] = array('expr_type' => ExpressionType::COLREF, 'base_expr' => $trim);
break;
case '':
$currCategory = 'TABLENAME';
$expr[] = array('expr_type' => ExpressionType::TABLE, 'base_expr' => $trim);
break;
default:
break;
}
}
return empty($expr) ? null : $expr;
}
}
?>
Zerion Mini Shell 1.0