129 lines
3.5 KiB
PHP
129 lines
3.5 KiB
PHP
<?php
|
|
|
|
/**
|
|
* `LOCK` statement.
|
|
*/
|
|
|
|
namespace PhpMyAdmin\SqlParser\Statements;
|
|
|
|
use PhpMyAdmin\SqlParser\Components\LockExpression;
|
|
use PhpMyAdmin\SqlParser\Parser;
|
|
use PhpMyAdmin\SqlParser\Statement;
|
|
use PhpMyAdmin\SqlParser\Token;
|
|
use PhpMyAdmin\SqlParser\TokensList;
|
|
|
|
/**
|
|
* `LOCK` statement.
|
|
*
|
|
* @category Statements
|
|
*
|
|
* @license https://www.gnu.org/licenses/gpl-2.0.txt GPL-2.0+
|
|
*/
|
|
class LockStatement extends Statement
|
|
{
|
|
/**
|
|
* Tables with their Lock expressions.
|
|
*
|
|
* @var LockExpression[]
|
|
*/
|
|
public $locked = array();
|
|
|
|
/**
|
|
* Whether it's a LOCK statement
|
|
* if false, it's an UNLOCK statement
|
|
*/
|
|
public $isLock = true;
|
|
|
|
/**
|
|
* @param Parser $parser the instance that requests parsing
|
|
* @param TokensList $list the list of tokens to be parsed
|
|
*/
|
|
public function parse(Parser $parser, TokensList $list)
|
|
{
|
|
if ($list->tokens[$list->idx]->value === 'UNLOCK') {
|
|
// this is in fact an UNLOCK statement
|
|
$this->isLock = false;
|
|
}
|
|
++$list->idx; // Skipping `LOCK`.
|
|
|
|
/**
|
|
* The state of the parser.
|
|
*
|
|
* Below are the states of the parser.
|
|
*
|
|
* 0 ---------------- [ TABLES ] -----------------> 1
|
|
* 1 -------------- [ lock_expr ] ----------------> 2
|
|
* 2 ------------------ [ , ] --------------------> 1
|
|
*
|
|
* @var int
|
|
*/
|
|
$state = 0;
|
|
|
|
/**
|
|
* Previous parsed token
|
|
*/
|
|
$prevToken = null;
|
|
|
|
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) || ($token->type === Token::TYPE_COMMENT)) {
|
|
continue;
|
|
}
|
|
|
|
if ($state === 0) {
|
|
if ($token->type === Token::TYPE_KEYWORD) {
|
|
if ($token->keyword !== 'TABLES') {
|
|
$parser->error('Unexpected keyword.', $token);
|
|
break;
|
|
}
|
|
$state = 1;
|
|
continue;
|
|
} else {
|
|
$parser->error('Unexpected token.', $token);
|
|
break;
|
|
}
|
|
} elseif ($state === 1) {
|
|
if (! $this->isLock) {
|
|
// UNLOCK statement should not have any more tokens
|
|
$parser->error('Unexpected token.', $token);
|
|
break;
|
|
}
|
|
$this->locked[] = LockExpression::parse($parser, $list);
|
|
$state = 2;
|
|
} elseif ($state === 2) {
|
|
if ($token->value === ',') {
|
|
// move over to parsing next lock expression
|
|
$state = 1;
|
|
}
|
|
}
|
|
|
|
$prevToken = $token;
|
|
}
|
|
|
|
if ($state !== 2 && $prevToken != null) {
|
|
$parser->error('Unexpected end of LOCK statement.', $prevToken);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @return string
|
|
*/
|
|
public function build()
|
|
{
|
|
return trim(($this->isLock ? 'LOCK' : 'UNLOCK')
|
|
. ' TABLES ' . LockExpression::build($this->locked));
|
|
}
|
|
}
|