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MySQLDumper/library/Msd/Sql/Object.php
2011-06-20 18:27:46 +00:00

327 Zeilen
7,8 KiB
PHP

<?php
/**
* This file is part of MySQLDumper released under the GNU/GPL 2 license
* http://www.mysqldumper.net
*
* @package MySQLDumper
* @subpackage SQL-Parser
* @version SVN: $Rev$
* @author $Author$
*/
/**
* Class to represent sql data to be parsed.
* Object is intended to be handled over to the parser classes so that they can work on it.
*
* @package MySQLDumper
* @subpackage SQL-Parser
*/
class Msd_Sql_Object
{
/**
* Holds string data to be parsed.
*
* @var string
*/
private $_data = '';
/**
* Holds a pointer to the actual examined part as offset.
*
* @var string
*/
private $_pointer = 0;
/**
* Holds the parsing state.
* This is set by the data examining methods of the parser and reflects the parser mode (select, insert, ...)
*
* @var string
*/
private $_state = '';
/**
* Holds parsing errors.
*
* @var string
*/
private $_errors = array();
/**
* Constructor
*
* @param null $sqlData SQl data to be parsed
*/
public function __construct($sqlData = null)
{
$this->_data = $sqlData;
}
/**
* Sets data of object
*
* @param string $sqlData The queries
*
* @return void
*/
public function setData($sqlData = '')
{
$this->_data = $sqlData;
}
/**
* Append data to already given data.
*
* @param string $sqlData The sql-string to be appended
*
* @return void
*/
private function appendData($sqlData)
{
$this->_data .= $sqlData;
}
/**
* Get the actual position of the pointer.
*
* @return int Pointer position
*/
public function getPointer()
{
return $this->_pointer;
}
/**
* Set the actual position of the pointer.
*
* @param int $position Position of pointer
*
* @return void
*/
public function setPointer($position)
{
$this->_pointer = $position;
}
/**
* Move pointer to the beginning of the next command.
*
* Skip all spaces and line-breaks until a character is found that might be the beginning
* of a new sql command.
*
* @return int New pointer position
*/
public function movePointerToNextCommand()
{
$pointer = $this->getPointer();
$dataSize = strlen($this->_data);
$skip = array(' ', "\n", "\r", "\t");
if ($this->_state !== 'Comment') {
$skip[] = "\n";
}
if (in_array($this->_data[$pointer], $skip)) {
while ($pointer < $dataSize && in_array($this->_data[$pointer], $skip)) {
$pointer++;
}
}
$this->setPointer($pointer);
if ($pointer >= $this->getLength()) {
$pointer = false;
}
return $pointer;
}
/**
* Move pointer forward by $positions positions.
*
* @param integer $positions Move pointer forward by $positions
*
* @return void
*/
public function movePointerForward($positions)
{
$this->setPointer($this->getPointer() + $positions);
}
/**
* Get data from actual pointer to given position.
*
* @param int $endPosition End position of pointer
* @param bool $movePointer Move pointer behind fetched data
*
* @return string Sql data from the pointer position to end or to the nr of chars to fetch
*/
public function getData($endPosition, $movePointer = true)
{
$data = substr($this->_data, $this->_pointer, ($endPosition - $this->_pointer));
if ($movePointer === true) {
$this->setPointer($endPosition +1);
}
return $data;
}
/**
* Get length of data string.
*
* @return int Length of data string
*/
public function getLength()
{
return strlen($this->_data);
}
/**
* Check if pointer has reached the end of the data string.
*
* @return bool
*/
public function hasMoreToProcess()
{
if ($this->_pointer < $this->getLength()) {
return true;
} else {
return false;
}
}
/**
* Set the parser state.
*
* @param string $state The parsing state we are actually in.
*
* @return void
*/
public function setState($state)
{
$this->_state = $state;
}
/**
* Find the next unescaped occurance of $match.
*
* Begins to search at the actual postion of the pointer.
*
* @param string $match The string to find
* @param bool $includeMatch Whether to add length of $match to position
*
* @return int
*/
public function getPosition($match = ';', $includeMatch = true)
{
$pointer = $this->getPointer();
$offset = $pointer;
$notFound = true;
$nextHit = false;
$length = $this->getLength() - 1; // zero-based
while ($notFound && $offset < $length) {
$nextHit = strpos($this->_data, $match, $offset);
//echo "<br>getPosition: Search for '".$match."' P: ".$offset."-> Hit at :".$nextHit;
if ($nextHit === false) {
// check special case for comments
if ($this->getState() == 'Comment' && strpos($this->_data, "\n", $pointer) === false) {
// there is no next line - return statement "as is"
$this->setPointer($this->getLength());
return $this->getLength();
}
// we haven't found the correct end of the query - inform user
$lang = Msd_Language::getInstance()->getTranslator();
$msg = sprintf(
$lang->_('L_SQL_INCOMPLETE_STATEMENT_DETECTED'),
$this->getState(),
$match,
$this->getData(200)
);
$this->setError($msg);
$this->setPointer($this->getLength());
return false;
}
$data = $this->getData($nextHit, false);
if (!$this->isEscaped($data)) {
// hit was not escaped - we found the match
$notFound = false;
if ($includeMatch) {
$nextHit += strlen($match)-1;
}
} else {
// keep on looking, this one was escaped
$offset = $nextHit+1;
}
}
return $nextHit;
}
/**
* Get data up to the next new line
*
* @return string
*/
public function getDataUntilNewLine()
{
}
/**
* Check if hit is escaped.
*
* @param string $string String to analyse
*
* @return bool
*/
private function isEscaped($string)
{
$string = str_replace('\\\\', '', $string);
$quotes = substr_count($string, '\'');
$escapedQuotes = substr_count($string, '\\\'');
if (($quotes - $escapedQuotes) % 2 == 0) {
return false;
} else {
return true;
}
}
/**
* Set an error message
*
* @param string $msg The error message
*
* @return void
*/
public function setError($msg)
{
$this->_errors[] = $msg;
}
/**
* Get error messages
*
* @return array
*/
public function getErrors()
{
return $this->_errors;
}
/**
* Check if errors occurred.
*
* @return bool
*/
public function hasErrors()
{
$ret = false;
if (sizeof($this->_errors) > 0) {
$ret = true;
}
return $ret;
}
/**
* Get actual parsing state
*
* @return array
*/
public function getState()
{
return $this->_state;
}
}