109 lines
3.8 KiB
PHP
109 lines
3.8 KiB
PHP
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<?php
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/**
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* SetProcessor.php
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*
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* This file implements the processor for the SET 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__) . '/ExpressionListProcessor.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 SET statements.
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*
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* @author arothe
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*
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*/
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class SetProcessor extends AbstractProcessor {
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private $expressionListProcessor;
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public function __construct() {
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$this->expressionListProcessor = new ExpressionListProcessor();
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}
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/**
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* A SET list is simply a list of key = value expressions separated by comma (,).
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* This function produces a list of the key/value expressions.
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*/
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protected function getAssignment($base_expr) {
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$assignment = $this->expressionListProcessor->process($this->splitSQLIntoTokens($base_expr));
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return array('expr_type' => ExpressionType::EXPRESSION, 'base_expr' => trim($base_expr),
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'sub_tree' => $assignment);
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}
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public function process($tokens, $isUpdate = false) {
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$result = array();
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$baseExpr = "";
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$assignment = false;
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$varType = false;
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foreach ($tokens as $token) {
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$upper = strtoupper(trim($token));
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switch ($upper) {
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case 'LOCAL':
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case 'SESSION':
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case 'GLOBAL':
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if (!$isUpdate) {
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$varType = $this->getVariableType("@@" . $upper . ".");
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$baseExpr = "";
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continue 2;
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}
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break;
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case ',':
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$assignment = $this->getAssignment($baseExpr);
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if (!$isUpdate && $varType !== false) {
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$assignment['sub_tree'][0]['expr_type'] = $varType;
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}
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$result[] = $assignment;
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$baseExpr = "";
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$varType = false;
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continue 2;
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default:
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}
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$baseExpr .= $token;
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}
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if (trim($baseExpr) !== "") {
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$assignment = $this->getAssignment($baseExpr);
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if (!$isUpdate && $varType !== false) {
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$assignment['sub_tree'][0]['expr_type'] = $varType;
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}
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$result[] = $assignment;
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}
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return $result;
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}
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}
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?>
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