144 lines
3.8 KiB
PHP
144 lines
3.8 KiB
PHP
<?php
|
|
|
|
/**
|
|
* `PURGE` statement.
|
|
*/
|
|
|
|
namespace PhpMyAdmin\SqlParser\Statements;
|
|
|
|
use PhpMyAdmin\SqlParser\Components\Expression;
|
|
use PhpMyAdmin\SqlParser\Components\OptionsArray;
|
|
use PhpMyAdmin\SqlParser\Parser;
|
|
use PhpMyAdmin\SqlParser\Statement;
|
|
use PhpMyAdmin\SqlParser\Token;
|
|
use PhpMyAdmin\SqlParser\TokensList;
|
|
|
|
/**
|
|
* `PURGE` statement.
|
|
*
|
|
* PURGE { BINARY | MASTER } LOGS
|
|
* { TO 'log_name' | BEFORE datetime_expr }
|
|
*
|
|
* @category Statements
|
|
*
|
|
* @license https://www.gnu.org/licenses/gpl-2.0.txt GPL-2.0+
|
|
*/
|
|
class PurgeStatement extends Statement
|
|
{
|
|
/**
|
|
* The type of logs
|
|
*
|
|
* @var String
|
|
*/
|
|
public $log_type;
|
|
|
|
/**
|
|
* The end option of this query.
|
|
*
|
|
* @var String
|
|
*/
|
|
public $end_option;
|
|
|
|
/**
|
|
* The end expr of this query.
|
|
*
|
|
* @var String
|
|
*/
|
|
public $end_expr;
|
|
|
|
/**
|
|
* @return string
|
|
*/
|
|
public function build()
|
|
{
|
|
$ret = 'PURGE ' . $this->log_type . ' ' . 'LOGS '
|
|
. ($this->end_option !== null ? ($this->end_option . ' ' . $this->end_expr) : '');
|
|
return trim($ret);
|
|
}
|
|
|
|
/**
|
|
* @param Parser $parser the instance that requests parsing
|
|
* @param TokensList $list the list of tokens to be parsed
|
|
*/
|
|
public function parse(Parser $parser, TokensList $list)
|
|
{
|
|
++$list->idx; // Skipping `PURGE`.
|
|
|
|
/**
|
|
* The state of the parser.
|
|
*
|
|
* @var int
|
|
*/
|
|
$state = 0;
|
|
|
|
for (; $list->idx < $list->count; ++$list->idx) {
|
|
/**
|
|
* Token parsed at this moment.
|
|
*
|
|
* @var Token
|
|
*/
|
|
$token = $list->tokens[$list->idx];
|
|
|
|
// End of statement.
|
|
if ($token->type === Token::TYPE_DELIMITER) {
|
|
break;
|
|
}
|
|
|
|
// Skipping whitespaces and comments.
|
|
if (($token->type === Token::TYPE_WHITESPACE) || ($token->type === Token::TYPE_COMMENT)) {
|
|
continue;
|
|
}
|
|
|
|
switch ($state) {
|
|
case 0:
|
|
// parse `{ BINARY | MASTER }`
|
|
$this->log_type = self::parseExpectedKeyword($parser, $token, array('BINARY', 'MASTER'));
|
|
break;
|
|
case 1:
|
|
// parse `LOGS`
|
|
self::parseExpectedKeyword($parser, $token, array('LOGS'));
|
|
break;
|
|
case 2:
|
|
// parse `{ TO | BEFORE }`
|
|
$this->end_option = self::parseExpectedKeyword($parser, $token, array('TO', 'BEFORE'));
|
|
break;
|
|
case 3:
|
|
// parse `expr`
|
|
$this->end_expr = Expression::parse($parser, $list, array());
|
|
break;
|
|
default:
|
|
$parser->error('Unexpected token.', $token);
|
|
break;
|
|
}
|
|
$state++;
|
|
$prevToken = $token;
|
|
}
|
|
|
|
// Only one possible end state
|
|
if ($state != 4) {
|
|
$parser->error('Unexpected token.', $prevToken);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Parse expected keyword (or throw relevant error)
|
|
*
|
|
* @param Parser $parser the instance that requests parsing
|
|
* @param Token $token token to be parsed
|
|
* @param Array $expected_keywords array of possibly expected keywords at this point
|
|
*/
|
|
private static function parseExpectedKeyword($parser, $token, $expected_keywords)
|
|
{
|
|
if ($token->type === Token::TYPE_KEYWORD) {
|
|
if (in_array($token->keyword, $expected_keywords)) {
|
|
return $token->keyword;
|
|
} else {
|
|
$parser->error('Unexpected keyword', $token);
|
|
}
|
|
} else {
|
|
$parser->error('Unexpected token.', $token);
|
|
}
|
|
return null;
|
|
}
|
|
}
|