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<?php /** * `REFERENCES` keyword parser. */ declare(strict_types=1); namespace PhpMyAdmin\SqlParser\Components; use PhpMyAdmin\SqlParser\Component; use PhpMyAdmin\SqlParser\Context; use PhpMyAdmin\SqlParser\Parser; use PhpMyAdmin\SqlParser\Token; use PhpMyAdmin\SqlParser\TokensList; use function implode; use function trim; /** * `REFERENCES` keyword parser. */ class Reference extends Component { /** * All references options. * * @var array */ public static $REFERENCES_OPTIONS = [ 'MATCH' => [ 1, 'var', ], 'ON DELETE' => [ 2, 'var', ], 'ON UPDATE' => [ 3, 'var', ], ]; /** * The referenced table. * * @var Expression */ public $table; /** * The referenced columns. * * @var array */ public $columns; /** * The options of the referencing. * * @var OptionsArray */ public $options; /** * @param Expression $table the name of the table referenced * @param array $columns the columns referenced * @param OptionsArray $options the options */ public function __construct($table = null, array $columns = [], $options = null) { $this->table = $table; $this->columns = $columns; $this->options = $options; } /** * @param Parser $parser the parser that serves as context * @param TokensList $list the list of tokens that are being parsed * @param array $options parameters for parsing * * @return Reference */ public static function parse(Parser $parser, TokensList $list, array $options = []) { $ret = new static(); /** * The state of the parser. * * Below are the states of the parser. * * 0 ----------------------[ table ]---------------------> 1 * * 1 ---------------------[ columns ]--------------------> 2 * * 2 ---------------------[ options ]--------------------> (END) * * @var int */ $state = 0; 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) { $ret->table = Expression::parse( $parser, $list, [ 'parseField' => 'table', 'breakOnAlias' => true, ] ); $state = 1; } elseif ($state === 1) { $ret->columns = ArrayObj::parse($parser, $list)->values; $state = 2; } elseif ($state === 2) { $ret->options = OptionsArray::parse($parser, $list, static::$REFERENCES_OPTIONS); ++$list->idx; break; } } --$list->idx; return $ret; } /** * @param Reference $component the component to be built * @param array $options parameters for building * * @return string */ public static function build($component, array $options = []) { return trim( $component->table . ' (' . implode(', ', Context::escape($component->columns)) . ') ' . $component->options ); } }