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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\Expression; |
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use PhpMyAdmin\SqlParser\Parser; |
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use PhpMyAdmin\SqlParser\Parsers\Expressions; |
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use PhpMyAdmin\SqlParser\Statement; |
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use PhpMyAdmin\SqlParser\Token; |
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use PhpMyAdmin\SqlParser\TokensList; |
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use PhpMyAdmin\SqlParser\TokenType; |
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use function in_array; |
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use function trim; |
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/** |
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* `PURGE` statement. |
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* |
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* PURGE { BINARY | MASTER } LOGS |
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* { TO 'log_name' | BEFORE datetime_expr } |
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*/ |
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class PurgeStatement extends Statement |
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{ |
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/** |
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* The type of logs |
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*/ |
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public string|null $logType = null; |
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/** |
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* The end option of this query. |
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*/ |
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public string|null $endOption = null; |
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/** |
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* The end expr of this query. |
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*/ |
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public Expression|null $endExpr = null; |
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public function build(): string |
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{ |
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$ret = 'PURGE ' . $this->logType . ' LOGS ' |
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. ($this->endOption !== null ? ($this->endOption . ' ' . $this->endExpr) : ''); |
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return trim($ret); |
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} |
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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 $list): void |
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{ |
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++$list->idx; // Skipping `PURGE`. |
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/** |
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* The state of the parser. |
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*/ |
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$state = 0; |
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$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) || ($token->type === TokenType::Comment)) { |
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continue; |
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} |
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switch ($state) { |
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case 0: |
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// parse `{ BINARY | MASTER }` |
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$this->logType = self::parseExpectedKeyword($parser, $token, ['BINARY', 'MASTER']); |
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break; |
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case 1: |
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// parse `LOGS` |
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self::parseExpectedKeyword($parser, $token, ['LOGS']); |
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break; |
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case 2: |
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// parse `{ TO | BEFORE }` |
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$this->endOption = self::parseExpectedKeyword($parser, $token, ['TO', 'BEFORE']); |
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break; |
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case 3: |
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// parse `expr` |
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$this->endExpr = Expressions::parse($parser, $list, []); |
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break; |
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default: |
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$parser->error('Unexpected token.', $token); |
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break; |
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} |
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$state++; |
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$prevToken = $token; |
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} |
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// Only one possible end state |
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if ($state === 4) { |
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return; |
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} |
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$parser->error('Unexpected token.', $prevToken); |
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} |
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/** |
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* Parse expected keyword (or throw relevant error) |
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* |
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* @param Parser $parser the instance that requests parsing |
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* @param Token $token token to be parsed |
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* @param string[] $expectedKeywords array of possibly expected keywords at this point |
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*/ |
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private static function parseExpectedKeyword(Parser $parser, Token $token, array $expectedKeywords): string|null |
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{ |
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if ($token->type === TokenType::Keyword) { |
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if (in_array($token->keyword, $expectedKeywords)) { |
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return $token->keyword; |
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} |
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$parser->error('Unexpected keyword', $token); |
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} else { |
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$parser->error('Unexpected token.', $token); |
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} |
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return null; |
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} |
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} |
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phpmyadmin /
sql-parser
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