222 lines
9.5 KiB
PHP
222 lines
9.5 KiB
PHP
<?php
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/**
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* position-calculator.php
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*
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* This file implements the calculator for the position elements of
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* the output of the PHPSQLParser.
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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__) . '/../utils/PHPSQLParserConstants.php';
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require_once dirname(__FILE__) . '/../exceptions/UnableToCalculatePositionException.php';
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/**
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* This class calculates the positions
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* of base_expr within the original SQL statement.
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*
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* @author arothe <andre.rothe@phosco.info>
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*
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*/
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class PositionCalculator {
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private static $_allowedOnOperator = array("\t", "\n", "\r", " ", ",", "(", ")", "_", "'", "\"");
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private static $_allowedOnOther = array("\t", "\n", "\r", " ", ",", "(", ")", "<", ">", "*", "+", "-", "/", "|",
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"&", "=", "!", ";");
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private function _printPos($text, $sql, $charPos, $key, $parsed, $backtracking) {
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if (!isset($_ENV['DEBUG'])) {
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return;
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}
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$spaces = "";
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$caller = debug_backtrace();
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$i = 1;
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while ($caller[$i]['function'] === 'lookForBaseExpression') {
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$spaces .= " ";
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$i++;
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}
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$holdem = substr($sql, 0, $charPos) . "^" . substr($sql, $charPos);
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echo $spaces . $text . " key:" . $key . " parsed:" . $parsed . " back:" . serialize($backtracking) . " "
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. $holdem . "\n";
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}
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public function setPositionsWithinSQL($sql, $parsed) {
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$charPos = 0;
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$backtracking = array();
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$this->lookForBaseExpression($sql, $charPos, $parsed, 0, $backtracking);
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return $parsed;
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}
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private function findPositionWithinString($sql, $value, $expr_type) {
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$offset = 0;
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$ok = false;
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while (true) {
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$pos = strpos($sql, $value, $offset);
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if ($pos === false) {
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break;
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}
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$before = "";
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if ($pos > 0) {
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$before = $sql[$pos - 1];
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}
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$after = "";
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if (isset($sql[$pos + strlen($value)])) {
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$after = $sql[$pos + strlen($value)];
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}
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// if we have an operator, it should be surrounded by
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// whitespace, comma, parenthesis, digit or letter, end_of_string
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// an operator should not be surrounded by another operator
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if ($expr_type === 'operator') {
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$ok = ($before === "" || in_array($before, self::$_allowedOnOperator, true))
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|| (strtolower($before) >= 'a' && strtolower($before) <= 'z') || ($before >= '0' && $before <= '9');
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$ok = $ok
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&& ($after === "" || in_array($after, self::$_allowedOnOperator, true)
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|| (strtolower($after) >= 'a' && strtolower($after) <= 'z') || ($after >= '0' && $after <= '9')
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|| ($after === '?') || ($after === '@'));
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if (!$ok) {
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$offset = $pos + 1;
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continue;
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}
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break;
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}
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// in all other cases we accept
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// whitespace, comma, operators, parenthesis and end_of_string
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$ok = ($before === "" || in_array($before, self::$_allowedOnOther, true));
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$ok = $ok && ($after === "" || in_array($after, self::$_allowedOnOther, true));
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if ($ok) {
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break;
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}
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$offset = $pos + 1;
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}
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return $pos;
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}
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private function lookForBaseExpression($sql, &$charPos, &$parsed, $key, &$backtracking) {
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if (!is_numeric($key)) {
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if (($key === 'UNION' || $key === 'UNION ALL')
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|| ($key === 'expr_type' && $parsed === ExpressionType::EXPRESSION)
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|| ($key === 'expr_type' && $parsed === ExpressionType::SUBQUERY)
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|| ($key === 'expr_type' && $parsed === ExpressionType::BRACKET_EXPRESSION)
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|| ($key === 'expr_type' && $parsed === ExpressionType::TABLE_EXPRESSION)
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|| ($key === 'expr_type' && $parsed === ExpressionType::RECORD)
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|| ($key === 'expr_type' && $parsed === ExpressionType::IN_LIST)
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|| ($key === 'expr_type' && $parsed === ExpressionType::MATCH_ARGUMENTS)
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|| ($key === 'expr_type' && $parsed === ExpressionType::TABLE)
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|| ($key === 'expr_type' && $parsed === ExpressionType::TEMPORARY_TABLE)
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|| ($key === 'expr_type' && $parsed === ExpressionType::COLUMN_TYPE)
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|| ($key === 'expr_type' && $parsed === ExpressionType::COLDEF)
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|| ($key === 'expr_type' && $parsed === ExpressionType::PRIMARY_KEY)
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|| ($key === 'expr_type' && $parsed === ExpressionType::CONSTRAINT)
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|| ($key === 'expr_type' && $parsed === ExpressionType::COLUMN_LIST)
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|| ($key === 'expr_type' && $parsed === ExpressionType::CHECK)
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|| ($key === 'expr_type' && $parsed === ExpressionType::COLLATE)
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|| ($key === 'expr_type' && $parsed === ExpressionType::LIKE)
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|| ($key === 'expr_type' && $parsed === ExpressionType::INDEX)
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|| ($key === 'select-option' && $parsed !== false) || ($key === 'alias' && $parsed !== false)) {
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// we hold the current position and come back after the next base_expr
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// we do this, because the next base_expr contains the complete expression/subquery/record
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// and we have to look into it too
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$backtracking[] = $charPos;
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} elseif (($key === 'ref_clause' || $key === 'columns') && $parsed !== false) {
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// we hold the current position and come back after n base_expr(s)
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// there is an array of sub-elements before (!) the base_expr clause of the current element
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// so we go through the sub-elements and must come at the end
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$backtracking[] = $charPos;
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for ($i = 1; $i < count($parsed); $i++) {
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$backtracking[] = false; // backtracking only after n base_expr!
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}
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} elseif (($key === 'sub_tree' && $parsed !== false) || ($key === 'options' && $parsed !== false)) {
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// we prevent wrong backtracking on subtrees (too much array_pop())
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// there is an array of sub-elements after(!) the base_expr clause of the current element
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// so we go through the sub-elements and must not come back at the end
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for ($i = 1; $i < count($parsed); $i++) {
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$backtracking[] = false;
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}
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} elseif (($key === 'TABLE') || ($key === 'create-def' && $parsed !== false)) {
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// do nothing
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} else {
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// move the current pos after the keyword
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// SELECT, WHERE, INSERT etc.
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if (PHPSQLParserConstants::isReserved($key)) {
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$charPos = stripos($sql, $key, $charPos);
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$charPos += strlen($key);
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}
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}
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}
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if (!is_array($parsed)) {
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return;
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}
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foreach ($parsed as $key => $value) {
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if ($key === 'base_expr') {
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//$this->_printPos("0", $sql, $charPos, $key, $value, $backtracking);
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$subject = substr($sql, $charPos);
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$pos = $this->findPositionWithinString($subject, $value,
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isset($parsed['expr_type']) ? $parsed['expr_type'] : 'alias');
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if ($pos === false) {
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throw new UnableToCalculatePositionException($value, $subject);
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}
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$parsed['position'] = $charPos + $pos;
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$charPos += $pos + strlen($value);
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//$this->_printPos("1", $sql, $charPos, $key, $value, $backtracking);
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$oldPos = array_pop($backtracking);
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if (isset($oldPos) && $oldPos !== false) {
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$charPos = $oldPos;
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}
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//$this->_printPos("2", $sql, $charPos, $key, $value, $backtracking);
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} else {
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$this->lookForBaseExpression($sql, $charPos, $parsed[$key], $key, $backtracking);
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}
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}
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}
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}
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?>
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