389 lines
16 KiB
PHP
389 lines
16 KiB
PHP
<?php
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/**
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* ExpressionListProcessor.php
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*
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* This file implements the processor for expression lists.
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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__) . '/DefaultProcessor.php');
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require_once(dirname(__FILE__) . '/../utils/ExpressionToken.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 expression lists.
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*
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* @author arothe
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*
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*/
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class ExpressionListProcessor extends AbstractProcessor {
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public function process($tokens) {
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$resultList = array();
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$skip_next = false;
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$prev = new ExpressionToken();
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foreach ($tokens as $k => $v) {
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$curr = new ExpressionToken($k, $v);
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if ($curr->isWhitespaceToken()) {
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continue;
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}
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if ($skip_next) {
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// skip the next non-whitespace token
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$skip_next = false;
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continue;
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}
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/* is it a subquery? */
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if ($curr->isSubQueryToken()) {
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$processor = new DefaultProcessor();
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$curr->setSubTree($processor->process($this->removeParenthesisFromStart($curr->getTrim())));
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$curr->setTokenType(ExpressionType::SUBQUERY);
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} elseif ($curr->isEnclosedWithinParenthesis()) {
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/* is it an in-list? */
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$localTokenList = $this->splitSQLIntoTokens($this->removeParenthesisFromStart($curr->getTrim()));
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if ($prev->getUpper() === 'IN') {
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foreach ($localTokenList as $k => $v) {
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$tmpToken = new ExpressionToken($k, $v);
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if ($tmpToken->isCommaToken()) {
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unset($localTokenList[$k]);
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}
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}
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$localTokenList = array_values($localTokenList);
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$curr->setSubTree($this->process($localTokenList));
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$curr->setTokenType(ExpressionType::IN_LIST);
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} elseif ($prev->getUpper() === 'AGAINST') {
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$match_mode = false;
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foreach ($localTokenList as $k => $v) {
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$tmpToken = new ExpressionToken($k, $v);
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switch ($tmpToken->getUpper()) {
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case 'WITH':
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$match_mode = 'WITH QUERY EXPANSION';
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break;
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case 'IN':
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$match_mode = 'IN BOOLEAN MODE';
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break;
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default:
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}
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if ($match_mode !== false) {
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unset($localTokenList[$k]);
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}
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}
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$tmpToken = $this->process($localTokenList);
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if ($match_mode !== false) {
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$match_mode = new ExpressionToken(0, $match_mode);
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$match_mode->setTokenType(ExpressionType::MATCH_MODE);
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$tmpToken[] = $match_mode->toArray();
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}
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$curr->setSubTree($tmpToken);
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$curr->setTokenType(ExpressionType::MATCH_ARGUMENTS);
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$prev->setTokenType(ExpressionType::SIMPLE_FUNCTION);
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} elseif ($prev->isColumnReference() || $prev->isFunction() || $prev->isAggregateFunction()) {
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// if we have a colref followed by a parenthesis pair,
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// it isn't a colref, it is a user-function
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// TODO: this should be a method, because we need the same code
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// below for unspecified tokens (expressions).
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$localExpr = new ExpressionToken();
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$tmpExprList = array();
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foreach ($localTokenList as $k => $v) {
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$tmpToken = new ExpressionToken($k, $v);
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if (!$tmpToken->isCommaToken()) {
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$localExpr->addToken($v);
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$tmpExprList[] = $v;
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} else {
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// an expression could have multiple parts split by operands
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// if we have a comma, it is a split-point for expressions
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$tmpExprList = array_values($tmpExprList);
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$localExprList = $this->process($tmpExprList);
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if (count($localExprList) > 1) {
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$localExpr->setSubTree($localExprList);
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$localExpr->setTokenType(ExpressionType::EXPRESSION);
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$localExprList = $localExpr->toArray();
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$localExprList['alias'] = false;
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$localExprList = array($localExprList);
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}
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if (!$curr->getSubTree()) {
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$curr->setSubTree($localExprList);
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} else {
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$tmpExprList = $curr->getSubTree();
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$curr->setSubTree(array_merge($tmpExprList, $localExprList));
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}
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$tmpExprList = array();
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$localExpr = new ExpressionToken();
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}
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}
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$tmpExprList = array_values($tmpExprList);
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$localExprList = $this->process($tmpExprList);
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if (count($localExprList) > 1) {
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$localExpr->setSubTree($localExprList);
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$localExpr->setTokenType(ExpressionType::EXPRESSION);
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$localExprList = $localExpr->toArray();
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$localExprList['alias'] = false;
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$localExprList = array($localExprList);
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}
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if (!$curr->getSubTree()) {
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$curr->setSubTree($localExprList);
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} else {
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$tmpExprList = $curr->getSubTree();
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$curr->setSubTree(array_merge($tmpExprList, $localExprList));
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}
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$prev->setSubTree($curr->getSubTree());
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if ($prev->isColumnReference()) {
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$prev->setTokenType(ExpressionType::SIMPLE_FUNCTION);
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$prev->setNoQuotes(null);
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}
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array_pop($resultList);
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$curr = $prev;
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}
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// we have parenthesis, but it seems to be an expression
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if ($curr->isUnspecified()) {
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// TODO: the localTokenList could contain commas and further expressions,
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// we must handle that like function parameters (see above)!
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// this should solve issue 51
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$curr->setSubTree($this->process($localTokenList));
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$curr->setTokenType(ExpressionType::BRACKET_EXPRESSION);
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}
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} elseif ($curr->isVariableToken()) {
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# a variable
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# it can be quoted
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$curr->setTokenType($this->getVariableType($curr->getUpper()));
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$curr->setSubTree(false);
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$curr->setNoQuotes(trim(trim($curr->getToken()), '@'), "`'\"");
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} else {
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/* it is either an operator, a colref or a constant */
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switch ($curr->getUpper()) {
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case '*':
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$curr->setSubTree(false); // o subtree
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// single or first element of expression list -> all-column-alias
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if (empty($resultList)) {
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$curr->setTokenType(ExpressionType::COLREF);
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break;
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}
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// if the last token is colref, const or expression
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// then * is an operator
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// but if the previous colref ends with a dot, the * is the all-columns-alias
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if (!$prev->isColumnReference() && !$prev->isConstant() && !$prev->isExpression()
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&& !$prev->isBracketExpression() && !$prev->isAggregateFunction() && !$prev->isVariable()) {
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$curr->setTokenType(ExpressionType::COLREF);
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break;
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}
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if ($prev->isColumnReference() && $prev->endsWith(".")) {
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$prev->addToken('*'); // tablealias dot *
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continue 2; // skip the current token
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}
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$curr->setTokenType(ExpressionType::OPERATOR);
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break;
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case ':=':
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case 'AND':
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case '&&':
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case 'BETWEEN':
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case 'AND':
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case 'BINARY':
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case '&':
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case '~':
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case '|':
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case '^':
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case 'DIV':
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case '/':
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case '<=>':
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case '=':
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case '>=':
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case '>':
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case 'IS':
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case 'NOT':
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case '<<':
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case '<=':
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case '<':
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case 'LIKE':
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case '%':
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case '!=':
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case '<>':
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case 'REGEXP':
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case '!':
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case '||':
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case 'OR':
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case '>>':
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case 'RLIKE':
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case 'SOUNDS':
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case 'XOR':
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case 'IN':
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$curr->setSubTree(false);
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$curr->setTokenType(ExpressionType::OPERATOR);
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break;
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case 'NULL':
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$curr->setSubTree(false);
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$curr->setTokenType(ExpressionType::CONSTANT);
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break;
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case '-':
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case '+':
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// differ between preceding sign and operator
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$curr->setSubTree(false);
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if ($prev->isColumnReference() || $prev->isFunction() || $prev->isAggregateFunction()
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|| $prev->isConstant() || $prev->isSubQuery() || $prev->isExpression()
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|| $prev->isBracketExpression() || $prev->isVariable()) {
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$curr->setTokenType(ExpressionType::OPERATOR);
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} else {
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$curr->setTokenType(ExpressionType::SIGN);
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}
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break;
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default:
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$curr->setSubTree(false);
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switch ($curr->getToken(0)) {
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case "'":
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case '"':
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// it is a string literal
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$curr->setTokenType(ExpressionType::CONSTANT);
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break;
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case '`':
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// it is an escaped colum name
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$curr->setTokenType(ExpressionType::COLREF);
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$curr->setNoQuotes($curr->getToken());
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break;
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default:
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if (is_numeric($curr->getToken())) {
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if ($prev->isSign()) {
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$prev->addToken($curr->getToken()); // it is a negative numeric constant
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$prev->setTokenType(ExpressionType::CONSTANT);
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continue 3;
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// skip current token
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} else {
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$curr->setTokenType(ExpressionType::CONSTANT);
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}
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} else {
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$curr->setTokenType(ExpressionType::COLREF);
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$curr->setNoQuotes($curr->getToken());
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}
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break;
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}
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}
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}
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/* is a reserved word? */
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if (!$curr->isOperator() && !$curr->isInList() && !$curr->isFunction() && !$curr->isAggregateFunction()
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&& PHPSQLParserConstants::isReserved($curr->getUpper())) {
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if (PHPSQLParserConstants::isAggregateFunction($curr->getUpper())) {
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$curr->setTokenType(ExpressionType::AGGREGATE_FUNCTION);
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$curr->setNoQuotes(null);
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} elseif ($curr->getUpper() === 'NULL') {
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// it is a reserved word, but we would like to set it as constant
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$curr->setTokenType(ExpressionType::CONSTANT);
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} else {
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if (PHPSQLParserConstants::isParameterizedFunction($curr->getUpper())) {
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// issue 60: check functions with parameters
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// -> colref (we check parameters later)
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// -> if there is no parameter, we leave the colref
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$curr->setTokenType(ExpressionType::COLREF);
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} elseif (PHPSQLParserConstants::isFunction($curr->getUpper())) {
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$curr->setTokenType(ExpressionType::SIMPLE_FUNCTION);
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$curr->setNoQuotes(null);
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} else {
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$curr->setTokenType(ExpressionType::RESERVED);
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$curr->setNoQuotes(null);
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}
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}
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}
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// issue 94, INTERVAL 1 MONTH
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if ($curr->isConstant() && PHPSQLParserConstants::isParameterizedFunction($prev->getUpper())) {
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$prev->setTokenType(ExpressionType::RESERVED);
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$prev->setNoQuotes(null);
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}
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if ($prev->isConstant() && PHPSQLParserConstants::isParameterizedFunction($curr->getUpper())) {
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$curr->setTokenType(ExpressionType::RESERVED);
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$curr->setNoQuotes(null);
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}
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if ($curr->isUnspecified()) {
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$curr->setTokenType(ExpressionType::EXPRESSION);
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$curr->setNoQuotes(null);
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$curr->setSubTree($this->process($this->splitSQLIntoTokens($curr->getTrim())));
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}
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$resultList[] = $curr;
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$prev = $curr;
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} // end of for-loop
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return $this->toArray($resultList);
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}
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}
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?>
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