130 lines
4.4 KiB
PHP
130 lines
4.4 KiB
PHP
<?php
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/**
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* OrderByProcessor.php
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*
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* This file implements the processor for the ORDER-BY 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__) . '/SelectExpressionProcessor.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 ORDER-BY statements.
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*
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* @author arothe
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*
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*/
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class OrderByProcessor extends AbstractProcessor {
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private $selectExpressionProcessor;
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public function __construct() {
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$this->selectExpressionProcessor = new SelectExpressionProcessor();
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}
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protected function initParseInfo() {
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return array('base_expr' => "", 'dir' => "ASC", 'expr_type' => ExpressionType::EXPRESSION);
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}
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protected function processOrderExpression(&$parseInfo, $select) {
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$parseInfo['base_expr'] = trim($parseInfo['base_expr']);
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if ($parseInfo['base_expr'] === "") {
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return false;
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}
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if (is_numeric($parseInfo['base_expr'])) {
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$parseInfo['expr_type'] = ExpressionType::POSITION;
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} else {
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$parseInfo['no_quotes'] = $this->revokeQuotation($parseInfo['base_expr']);
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// search to see if the expression matches an alias
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foreach ($select as $clause) {
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if (!$clause['alias']) {
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continue;
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}
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if ($clause['alias']['no_quotes'] === $parseInfo['no_quotes']) {
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$parseInfo['expr_type'] = ExpressionType::ALIAS;
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break;
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}
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}
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}
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if ($parseInfo['expr_type'] === ExpressionType::EXPRESSION) {
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$expr = $this->selectExpressionProcessor->process($parseInfo['base_expr']);
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$expr['direction'] = $parseInfo['dir'];
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unset($expr['alias']);
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return $expr;
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}
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$result = array();
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$result['expr_type'] = $parseInfo['expr_type'];
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$result['base_expr'] = $parseInfo['base_expr'];
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if (isset($parseInfo['no_quotes'])) {
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$result['no_quotes'] = $parseInfo['no_quotes'];
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}
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$result['direction'] = $parseInfo['dir'];
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return $result;
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}
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public function process($tokens, $select = array()) {
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$out = array();
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$parseInfo = $this->initParseInfo();
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if (!$tokens) {
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return false;
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}
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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 ',':
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$out[] = $this->processOrderExpression($parseInfo, $select);
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$parseInfo = $this->initParseInfo();
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break;
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case 'DESC':
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$parseInfo['dir'] = "DESC";
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break;
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case 'ASC':
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$parseInfo['dir'] = "ASC";
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break;
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default:
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$parseInfo['base_expr'] .= $token;
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}
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}
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$out[] = $this->processOrderExpression($parseInfo, $select);
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return $out;
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}
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}
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?>
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