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<?php
/**
* `REFERENCES` keyword parser.
*/
namespace PhpMyAdmin\SqlParser\Components;
use PhpMyAdmin\SqlParser\Component;
use PhpMyAdmin\SqlParser\Context;
use PhpMyAdmin\SqlParser\Parser;
use PhpMyAdmin\SqlParser\Token;
use PhpMyAdmin\SqlParser\TokensList;
/**
* `REFERENCES` keyword parser.
*
* @category Keywords
*
* @license https://www.gnu.org/licenses/gpl-2.0.txt GPL-2.0+
*/
class Reference extends Component
{
/**
* All references options.
*
* @var array
*/
public static $REFERENCES_OPTIONS = array(
'MATCH' => array(
1,
'var',
),
'ON DELETE' => array(
2,
'var',
),
'ON UPDATE' => array(
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;
/**
* Constructor.
*
* @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 = array(), $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 = array())
{
$ret = new self();
/**
* 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,
array(
'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 = array())
{
return trim(
$component->table
. ' (' . implode(', ', Context::escape($component->columns)) . ') '
. $component->options
);
}
}