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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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use function implode; |
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/** |
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* `ORDER BY` keyword parser. |
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*/ |
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final class OrderKeyword implements Component |
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{ |
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/** |
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* The expression that is used for ordering. |
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* |
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* @var Expression |
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*/ |
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public $expr; |
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/** |
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* The order type. |
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* |
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* @var string |
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*/ |
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public $type; |
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/** |
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* @param Expression $expr the expression that we are sorting by |
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* @param string $type the sorting type |
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*/ |
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public function __construct($expr = null, $type = 'ASC') |
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{ |
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$this->expr = $expr; |
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$this->type = $type; |
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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 OrderKeyword[] |
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*/ |
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public static function parse(Parser $parser, TokensList $list, array $options = []): array |
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{ |
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$ret = []; |
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$expr = new static(); |
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/** |
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* The state of the parser. |
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* |
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* Below are the states of the parser. |
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* |
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* 0 --------------------[ expression ]-------------------> 1 |
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* |
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* 1 ------------------------[ , ]------------------------> 0 |
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* 1 -------------------[ ASC / DESC ]--------------------> 1 |
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* |
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* @var int |
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*/ |
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$state = 0; |
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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) || ($token->type === Token::TYPE_COMMENT)) { |
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continue; |
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} |
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if ($state === 0) { |
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$expr->expr = Expression::parse($parser, $list); |
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$state = 1; |
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} elseif ($state === 1) { |
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if ( |
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($token->type === Token::TYPE_KEYWORD) |
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&& (($token->keyword === 'ASC') || ($token->keyword === 'DESC')) |
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) { |
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$expr->type = $token->keyword; |
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} elseif (($token->type === Token::TYPE_OPERATOR) && ($token->value === ',')) { |
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if (! empty($expr->expr)) { |
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$ret[] = $expr; |
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} |
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$expr = new static(); |
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$state = 0; |
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} else { |
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break; |
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} |
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} |
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} |
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// Last iteration was not processed. |
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if (! empty($expr->expr)) { |
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$ret[] = $expr; |
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} |
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--$list->idx; |
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return $ret; |
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} |
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/** |
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* @param OrderKeyword $component the component to be built |
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*/ |
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public static function build($component): string |
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{ |
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return $component->expr . ' ' . $component->type; |
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} |
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/** |
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* @param OrderKeyword[] $component the component to be built |
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*/ |
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public static function buildAll(array $component): string |
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{ |
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return implode(', ', $component); |
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} |
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public function __toString(): string |
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{ |
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return static::build($this); |
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} |
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} |
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phpmyadmin /
sql-parser
