mirror of
https://github.com/VTECRM/vtenext.git
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140 lines
4.8 KiB
PHP
140 lines
4.8 KiB
PHP
<?php
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/**
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* ExplainProcessor.php
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*
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* This file implements the processor for the EXPLAIN statements.
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*
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* Copyright (c) 2010-2012, Justin Swanhart
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* with contributions by André Rothe <arothe@phosco.info, phosco@gmx.de>
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*/
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require_once(dirname(__FILE__) . '/AbstractProcessor.php');
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require_once(dirname(__FILE__) . '/../utils/ExpressionType.php');
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/**
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*
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* This class processes the EXPLAIN statements.
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*
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* @author arothe
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*
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*/
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class ExplainProcessor extends AbstractProcessor {
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protected function isStatement($keys, $needle = "EXPLAIN") {
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$pos = array_search($needle, $keys);
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if (isset($keys[$pos + 1])) {
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return in_array($keys[$pos + 1], array('SELECT', 'DELETE', 'INSERT', 'REPLACE', 'UPDATE'), true);
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}
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return false;
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}
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// TODO: refactor that function
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public function process($tokens, $keys = array()) {
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$base_expr = "";
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$expr = array();
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$currCategory = "";
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if ($this->isStatement($keys)) {
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foreach ($tokens as $token) {
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$trim = trim($token);
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$base_expr .= $token;
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if ($trim === '') {
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continue;
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}
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$upper = strtoupper($trim);
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switch ($upper) {
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case 'EXTENDED':
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case 'PARTITIONS':
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return array('expr_type' => ExpressionType::RESERVED, 'base_expr' => $token);
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break;
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case 'FORMAT':
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if ($currCategory === '') {
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$currCategory = $upper;
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$expr[] = array('expr_type' => ExpressionType::RESERVED, 'base_expr' => $trim);
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}
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// else?
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break;
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case '=':
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if ($currCategory === 'FORMAT') {
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$expr[] = array('expr_type' => ExpressionType::OPERATOR, 'base_expr' => $trim);
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}
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// else?
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break;
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case 'TRADITIONAL':
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case 'JSON':
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if ($currCategory === 'FORMAT') {
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$expr[] = array('expr_type' => ExpressionType::RESERVED, 'base_expr' => $trim);
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return array('expr_type' => ExpressionType::EXPRESSION, 'base_expr' => trim($base_expr),
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'sub_tree' => $expr);
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}
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// else?
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break;
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default:
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// ignore the other stuff
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break;
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}
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}
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return empty($expr) ? null : $expr;
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}
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foreach ($tokens as $token) {
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$trim = trim($token);
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if ($trim === '') {
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continue;
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}
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switch ($currCategory) {
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case 'TABLENAME':
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$currCategory = 'WILD';
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$expr[] = array('expr_type' => ExpressionType::COLREF, 'base_expr' => $trim);
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break;
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case '':
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$currCategory = 'TABLENAME';
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$expr[] = array('expr_type' => ExpressionType::TABLE, 'base_expr' => $trim);
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break;
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default:
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break;
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}
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}
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return empty($expr) ? null : $expr;
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}
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}
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?>
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