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<?php |
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declare(strict_types=1); |
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namespace PhpMyAdmin\SqlParser\Components; |
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use PhpMyAdmin\SqlParser\Component; |
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use PhpMyAdmin\SqlParser\Parser; |
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use PhpMyAdmin\SqlParser\Token; |
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use PhpMyAdmin\SqlParser\TokensList; |
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/** |
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* `LIMIT` keyword parser. |
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*/ |
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final class Limit implements Component |
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{ |
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/** |
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* The number of rows skipped. |
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* |
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* @var int |
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*/ |
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public $offset; |
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/** |
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* The number of rows to be returned. |
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* |
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* @var int |
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*/ |
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public $rowCount; |
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/** |
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* @param int $rowCount the row count |
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* @param int $offset the offset |
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*/ |
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public function __construct($rowCount = 0, $offset = 0) |
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{ |
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$this->rowCount = $rowCount; |
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$this->offset = $offset; |
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} |
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/** |
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* @param Parser $parser the parser that serves as context |
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* @param TokensList $list the list of tokens that are being parsed |
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* @param array<string, mixed> $options parameters for parsing |
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* |
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* @return Limit |
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*/ |
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public static function parse(Parser $parser, TokensList $list, array $options = []) |
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{ |
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$ret = new static(); |
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$offset = false; |
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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 ($token->type === Token::TYPE_DELIMITER) { |
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break; |
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} |
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// Skipping whitespaces and comments. |
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if (($token->type === Token::TYPE_WHITESPACE) || ($token->type === Token::TYPE_COMMENT)) { |
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continue; |
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} |
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if (($token->type === Token::TYPE_KEYWORD) && ($token->flags & Token::FLAG_KEYWORD_RESERVED)) { |
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break; |
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} |
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if ($token->type === Token::TYPE_KEYWORD && $token->keyword === 'OFFSET') { |
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if ($offset) { |
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$parser->error('An offset was expected.', $token); |
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} |
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$offset = true; |
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continue; |
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} |
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if (($token->type === Token::TYPE_OPERATOR) && ($token->value === ',')) { |
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$ret->offset = $ret->rowCount; |
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$ret->rowCount = 0; |
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continue; |
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} |
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// Skip if not a number |
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if (($token->type !== Token::TYPE_NUMBER)) { |
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break; |
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} |
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if ($offset) { |
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$ret->offset = $token->value; |
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$offset = false; |
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} else { |
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$ret->rowCount = $token->value; |
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} |
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} |
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if ($offset) { |
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$parser->error('An offset was expected.', $list->tokens[$list->idx - 1]); |
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} |
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--$list->idx; |
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return $ret; |
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} |
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/** |
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* @param Limit $component the component to be built |
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* @param array<string, mixed> $options parameters for building |
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*/ |
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public static function build($component, array $options = []): string |
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{ |
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return $component->offset . ', ' . $component->rowCount; |
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} |
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public function __toString(): string |
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{ |
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return static::build($this); |
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} |
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} |
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phpmyadmin /
sql-parser
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