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<?php |
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declare(strict_types=1); |
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namespace PhpMyAdmin\SqlParser\Statements; |
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use PhpMyAdmin\SqlParser\Components\LockExpression; |
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use PhpMyAdmin\SqlParser\Parser; |
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use PhpMyAdmin\SqlParser\Parsers\LockExpressions; |
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use PhpMyAdmin\SqlParser\Statement; |
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use PhpMyAdmin\SqlParser\TokensList; |
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use PhpMyAdmin\SqlParser\TokenType; |
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use function trim; |
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/** |
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* `LOCK` statement. |
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*/ |
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class LockStatement extends Statement |
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{ |
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/** |
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* Tables with their Lock expressions. |
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* |
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* @var LockExpression[] |
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*/ |
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public array $locked = []; |
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/** |
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* Whether it's a LOCK statement |
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* if false, it's an UNLOCK statement |
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*/ |
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public bool $isLock = true; |
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/** |
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* @param Parser $parser the instance that requests parsing |
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* @param TokensList $list the list of tokens to be parsed |
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*/ |
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public function parse(Parser $parser, TokensList $list): void |
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{ |
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if ($list->tokens[$list->idx]->value === 'UNLOCK') { |
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// this is in fact an UNLOCK statement |
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$this->isLock = false; |
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} |
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++$list->idx; // Skipping `LOCK`. |
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/** |
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* The state of the parser. |
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* |
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* Below are the states of the parser. |
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* |
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* 0 ---------------- [ TABLES ] -----------------> 1 |
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* 1 -------------- [ lock_expr ] ----------------> 2 |
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* 2 ------------------ [ , ] --------------------> 1 |
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*/ |
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$state = 0; |
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/** |
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* Previous parsed token |
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*/ |
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$prevToken = null; |
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for (; $list->idx < $list->count; ++$list->idx) { |
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/** |
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* Token parsed at this moment. |
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*/ |
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$token = $list->tokens[$list->idx]; |
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// End of statement. |
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if ($token->type === TokenType::Delimiter) { |
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break; |
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} |
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// Skipping whitespaces and comments. |
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if (($token->type === TokenType::Whitespace) || ($token->type === TokenType::Comment)) { |
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continue; |
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} |
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if ($state === 0) { |
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if ($token->type === TokenType::Keyword) { |
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if ($token->keyword !== 'TABLES') { |
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$parser->error('Unexpected keyword.', $token); |
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break; |
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} |
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$state = 1; |
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continue; |
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} |
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$parser->error('Unexpected token.', $token); |
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break; |
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} |
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if ($state === 1) { |
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if (! $this->isLock) { |
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// UNLOCK statement should not have any more tokens |
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$parser->error('Unexpected token.', $token); |
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break; |
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} |
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$this->locked[] = LockExpressions::parse($parser, $list); |
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$state = 2; |
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} elseif ($state === 2) { |
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if ($token->value === ',') { |
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// move over to parsing next lock expression |
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$state = 1; |
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} |
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} |
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$prevToken = $token; |
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} |
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if ($state === 2 || $prevToken === null) { |
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return; |
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} |
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$parser->error('Unexpected end of LOCK statement.', $prevToken); |
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} |
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public function build(): string |
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{ |
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return trim(($this->isLock ? 'LOCK' : 'UNLOCK') |
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. ' TABLES ' . LockExpression::buildAll($this->locked)); |
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} |
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} |
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phpmyadmin /
sql-parser
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