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<?php |
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/** |
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* This file is part of MySQLParser with Delimiter Support. |
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* |
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* File: MysqlParser.php |
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* |
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* User: dherrman |
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* Date: 23.11.15 |
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* Time: 10:39 |
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*/ |
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namespace wazaari\MySQLParser; |
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class MySQLParser |
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{ |
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/** |
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* @var string Delimiter command used by the SQL flavor to indicate delimiter change |
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*/ |
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private $delimiterString = "DELIMITER"; |
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/** |
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* This function parses the given SQL file and returns an array including the commands and the delimiter. |
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* For each command, both the command itself and the delimiter is returned. |
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* Refer to the test cases for a detailled explanation |
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* |
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* @param $file |
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* @param string $defaultDelimiter |
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* @param boolean $appendDelimiterCommand Controls whether the Delimiter command itself should be returned |
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* @return array |
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* @throws \Exception |
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*/ |
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public function parseFile($file, $defaultDelimiter = ";", $appendDelimiterCommand = false) |
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{ |
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$currentDelimiter = $defaultDelimiter; |
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//Try to open File |
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if (!file_exists($file)) { |
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throw new \Exception('Unable to open file \'' . $file .'\': File not found'); |
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} |
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try { |
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$handle = fopen($file, "r"); |
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} catch (\Exception $e) { |
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throw new \Exception('Unable to open file \'' . $file .'\': File was found but unknown error occured.'); |
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} |
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//Initialize result array |
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$_lineArray = array(); |
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//Initialize multi-line cache |
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$multiLineCommand = null; |
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//Read file by line and watch out for DELIMITER clauses |
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while (($line = fgets($handle)) !== false) { |
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//Remove unneccessary whitespaces |
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$line = trim($line); |
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//if line starts with "--", it is a comment. Ignore |
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if ($this->startsWith($line, "--")) { |
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continue; |
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} |
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//Check if line starts with DELIMITER and extract it |
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if ($this->startsWith($line, $this->delimiterString)) { |
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$currentDelimiter = trim(substr($line, strlen($this->delimiterString))); |
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if ($appendDelimiterCommand === true) { |
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$_lineArray[] = array( |
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'command' => $this->delimiterString . ' ' . $currentDelimiter, |
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'delimiter' => null, |
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); |
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} |
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continue; |
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} |
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//Otherwise, this is a normal line |
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//Extract commands and save them to array |
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$instructions = array_map( |
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'trim', |
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array_filter(preg_split('~\\\\.(*SKIP)(*FAIL)|'.$currentDelimiter.'~s', $line)) |
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); |
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//When there is no instruction (empty line) --> continue with next |
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if (count($instructions) == 0) { |
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continue; |
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} |
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/** |
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* If the current multi-line cache is not null, all commands up to the next delimiter |
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* belong to this command |
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*/ |
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if ($multiLineCommand !== null) { |
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$firstCommand = array_shift($instructions); |
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// If this is the only instruction here and there is no Delimiter |
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// append to current file cache and continue. Else write to array and continue with next line |
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// Otherwise write to array and proceed with this line |
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if (count($instructions) == 0) { |
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if (substr($line, -strlen($currentDelimiter)) == $currentDelimiter) { |
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$_lineArray[] = array( |
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'command' => $multiLineCommand . ' ' . $firstCommand, |
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'delimiter' => $currentDelimiter |
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); |
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$multiLineCommand = null; |
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continue; |
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} else { |
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$multiLineCommand .= ' ' . $firstCommand; |
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continue; |
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} |
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} else { |
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$multiLineCommand .= ' ' . $firstCommand; |
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} |
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} |
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/** |
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* If line does not end with delimiter, the last element of the array belongs |
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* to a multi-line command |
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*/ |
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if (substr($line, -strlen($currentDelimiter)) != $currentDelimiter) { |
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$multiLineCommand = array_pop($instructions); |
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} |
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//Proceed with all other instructions as usual |
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foreach ($instructions as $i) { |
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$_lineArray[] = array( |
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'command' => $i, |
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'delimiter' => $currentDelimiter |
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); |
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} |
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} |
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fclose($handle); |
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return $_lineArray; |
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} |
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/** |
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* Calculates whether the string $haystack starts with $needle |
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* |
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* @see http://stackoverflow.com/questions/834303/startswith-and-endswith-functions-in-php |
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* @param $haystack The string to search in |
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* @param $needle The string to be searched |
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* @return bool |
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*/ |
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private function startsWith($haystack, $needle) |
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{ |
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return strncasecmp($haystack, $needle, strlen($needle)) === 0; |
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} |
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} |
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waza-ari /
MySQLParser
