311 Zeilen
8,7 KiB
PHP
311 Zeilen
8,7 KiB
PHP
<?php
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/**
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* This file is part of MySQLDumper released under the GNU/GPL 2 license
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* http://www.mysqldumper.net
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*
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* @package MySQLDumper
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* @subpackage SQL-Browser
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* @version SVN: $Rev$
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* @author $Author$
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*/
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require_once "Msd/Sql/Parser/Interface.php";
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/**
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* Class to parse MySQL queries.
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* This enables you to analyze and modify MySQL queries, which the user has entered.
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*
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* @package MySQLDumper
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* @subpackage SQL-Browser
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*/
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class Msd_Sql_Parser implements Iterator
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{
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/**
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* Saves the raw MySQL Query.
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*
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* @var string
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*/
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private $_rawQuery = null;
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/**
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* Parsed MySQL statements.
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*
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* @var array
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*/
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private $_parsedStatements = array();
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/**
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* Holds the summary of the parsing process.
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* The summary contains the count of each statement in the query.
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*
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* @var array
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*/
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private $_parsingSummary = array();
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/**
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* Available MySQL statements, divided and sorted by their length.
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*
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* @var array
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*/
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protected $_sqlStatements = array(
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2 => array(
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'do', 'xa'
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),
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3 => array(
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'set', 'use'
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),
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4 => array(
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'call', 'drop', 'help', 'kill', 'load', 'lock', 'show'
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),
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5 => array(
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'alter', 'check', 'flush', 'grant', 'purge', 'reset', 'slave', 'start'
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),
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6 => array(
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'backup', 'change', 'commit', 'create', 'delete', 'insert', 'rename', 'repair', 'revoke', 'select',
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'unlock', 'update'
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),
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7 => array(
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'analyze', 'execute', 'handler', 'install', 'preload', 'prepare', 'release', 'replace', 'restore'
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),
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8 => array(
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'checksum', 'describe', 'optimize', 'keycache', 'rollback', 'truncate'
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),
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9 => array(
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'savepoint', 'uninstall'
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),
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10 => array(
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'deallocate'
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),
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);
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/**
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* MySQL comment types.
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*
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* @var array
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*/
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protected $_sqlComments = array(
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'--' => "\n", '/*' => '*/', '/*!' => '*/'
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);
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/**
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* @var bool
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*/
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private $_debug = false;
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/**
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* Class constructor.
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* Creates a new instance of the MySQL parser and optionally assign the raw MySQL query.
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*
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* @param string $sqlQuery Raw MySQL query to parse
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* @param bool $debug If turned on, detection of queries is logged
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*/
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public function __construct($sqlQuery = null, $debug = false)
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{
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if ($sqlQuery !== null) {
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$this->_rawQuery = $sqlQuery;
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}
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$this->_debug = $debug;
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}
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/**
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* Parses a raw MySQL query.
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* This could include more than one MySQL statement.
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*
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* @throws Msd_Sql_Parser_Exception
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*
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* @param string $sqlQuery Raw MySQL query to parse
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*
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* @return void
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*/
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public function parse($sqlQuery = null)
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{
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if ($sqlQuery === null) {
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if ($this->_rawQuery === null) {
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include_once 'Msd/Sql/Parser/Exception.php';
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throw new Msd_Sql_Parser_Exception('You must specify a MySQL query for parsing!');
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}
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$sqlQuery = $this->_rawQuery;
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}
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$sqlQuery = trim($sqlQuery);
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$statementCounter = 0;
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$startPos = 0;
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if ($this->_debug) {
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ob_start();
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}
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while ($startPos < strlen($sqlQuery)) {
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$statementCounter++;
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$firstSpace = strpos($sqlQuery, ' ', $startPos);
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$statement = trim(strtolower(substr($sqlQuery, $startPos, $firstSpace - $startPos)));
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$lengthCheck = strlen($statement);
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if ($lengthCheck == 0) {
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break;
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}
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if ($lengthCheck == 1 || $statement{1} == ';' || $statement{1} == "\n") {
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$startPos = $startPos + 1;
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continue;
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}
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// check for comments or conditional comments
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$commentCheck = substr($statement, 0, 2);
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if (isset($this->_sqlComments[$commentCheck]) || substr($statement, 0, 3) == '/*!') {
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$commentEnd = $this->_sqlComments[$commentCheck];
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$endPos = strpos($sqlQuery, $commentEnd, $startPos) + strlen($commentEnd);
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$comment = substr($sqlQuery, $startPos, $endPos - $startPos);
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$this->_parseStatement($comment, 'Msd_Sql_Parser_Statement_Comment');
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$startPos = $endPos;
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continue;
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}
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$statementLength = strlen($statement);
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if (
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!isset($this->_sqlStatements[$statementLength]) ||
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!in_array($statement, $this->_sqlStatements[$statementLength])
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) {
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include_once 'Msd/Sql/Parser/Exception.php';
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throw new Msd_Sql_Parser_Exception("Unknown MySQL statement is found: '$statement'");
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}
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$parserClass = 'Msd_Sql_Parser_Statement_' . ucwords($statement);
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$endPos = $this->_getStatementEndPos($sqlQuery, $startPos);
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$completeStatement = trim(substr($sqlQuery, $startPos, $endPos - $startPos));
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$startPos = $endPos + 1;
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$this->_parsedStatements[] = $this->_parseStatement($completeStatement, $parserClass);
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if (!isset($this->_parsingSummary[$statement])) {
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$this->_parsingSummary[$statement] = 0;
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}
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$this->_parsingSummary[$statement]++;
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}
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if ($this->_debug != false) {
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$buffer = ob_get_contents();
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ob_end_clean();
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echo "<br />".$buffer."<br />";
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} else {
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ob_get_clean();
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}
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}
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/**
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* Searches the end of a MySQL statement and returns its position.
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*
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* @param string $sqlQuery The complete MySQL query
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* @param int $startPos Index, where to start the search.
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*
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* @return int End position of the statement
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*/
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private function _getStatementEndPos($sqlQuery, $startPos = 0)
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{
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$nextString = strpos($sqlQuery, "'", $startPos);
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$nextSemicolon = strpos($sqlQuery, ';', $startPos);
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if ($nextString === false) {
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if ($nextSemicolon === false) {
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return strlen($sqlQuery);
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}
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return $nextSemicolon;
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}
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while ($nextString < $nextSemicolon) {
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$nextString = strpos($sqlQuery, "'", $nextString + 1);
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$nextSemicolon = strpos($sqlQuery, ';', $nextString + 1);
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$nextString = strpos($sqlQuery, "'", $nextString + 1);
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if ($nextString === false) {
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break;
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}
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}
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return $nextSemicolon;
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}
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/**
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* Creates an instance of a statement parser class and invokes statement parsing.
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*
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* @param string $statement MySQL statement to parse
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* @param string $parserClass Parser class to use
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*
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* @return array
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*/
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private function _parseStatement($statement, $parserClass)
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{
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$classFilename = str_replace('_', '/', $parserClass) . '.php';
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include_once $classFilename;
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$parserObject = new $parserClass;
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if (!$parserObject instanceof Msd_Sql_Parser_Interface) {
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throw new Msd_Sql_Parser_Exception('The given parser class must implement Msd_Sql_Parser_Interface!');
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}
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return $parserObject->parse($statement);
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}
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/**
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* Returns the array with the parsed statements.
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*
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* @return array
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*/
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public function getParsedStatements()
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{
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return $this->_parsedStatements;
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}
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/**
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* Returns the parsing summary.
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*
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* @return array
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*/
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public function getSummary()
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{
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return $this->_parsingSummary;
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}
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/**
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* Rewind (reset) the internal pointer position af the parsed statements array.
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*
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* @return mixed
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*/
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public function rewind()
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{
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return reset($this->_parsedStatements);
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}
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/**
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* Return the current value af the parsed statements array.
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*
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* @return mixed
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*/
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public function current()
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{
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return current($this->_parsedStatements);
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}
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/**
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* Return the current key af the parsed statements array.
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*
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* @return mixed
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*/
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public function key()
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{
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return key($this->_parsedStatements);
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}
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/**
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* Move the internal pointer af the parsed statements array to the next position.
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*
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* @return mixed
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*/
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public function next()
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{
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return next($this->_parsedStatements);
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}
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/**
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* Validates the internal pointer position af the parsed statements array.
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*
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* @return bool
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*/
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public function valid()
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{
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return key($this->_parsedStatements) !== null;
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}
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}
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