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<?php
/**
* `REFERENCES` keyword parser.
*
* @package SqlParser
* @subpackage Components
*/
namespace SqlParser\Components;
use SqlParser\Context;
use SqlParser\Component;
use SqlParser\Parser;
use SqlParser\Token;
use SqlParser\TokensList;
/**
* `REFERENCES` keyword parser.
*
* @category Keywords
* @package SqlParser
* @subpackage Components
* @author Dan Ungureanu <udan1107@gmail.com>
* @license http://opensource.org/licenses/GPL-2.0 GNU Public License
*/
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 string
*/
public $table;
/**
* The referenced columns.
*
* @var array
*/
public $columns;
/**
* The options of the referencing.
*
* @var OptionsArray
*/
public $options;
/**
* Constructor.
*
* @param string $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 Reference();
/**
* The state of the parser.
*
* Below are the states of the parser.
*
* 0 ----------------------[ table ]---------------------> 1
*
* 1 ---------------------[ columns ]--------------------> 2
*
* 2 ---------------------[ options ]--------------------> (END)
*
* @var int $state
*/
$state = 0;
for (; $list->idx < $list->count; ++$list->idx) {
/**
* Token parsed at this moment.
*
* @var Token $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 = $token->value;
$state = 1;
} elseif ($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 $component The component to be built.
*
* @return string
*/
public static function build($component)
{
return trim(
Context::escape($component->table)
. ' (' . implode(', ', Context::escape($component->columns)) . ') '
. $component->options
);
}
}
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