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<?php
/**
* `RENAME TABLE` keyword parser.
*
* @package SqlParser
* @subpackage Components
*/
namespace SqlParser\Components;
use SqlParser\Component;
use SqlParser\Parser;
use SqlParser\Token;
use SqlParser\TokensList;
/**
* `RENAME TABLE` 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 RenameOperation extends Component
{
/**
* The old table name.
*
* @var Expression
*/
public $old;
/**
* The new table name.
*
* @var Expression
*/
public $new;
/**
* @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 RenameOperation[]
*/
public static function parse(Parser $parser, TokensList $list, array $options = array())
{
$ret = array();
$expr = new RenameOperation();
/**
* The state of the parser.
*
* Below are the states of the parser.
*
* 0 ---------------------[ old name ]--------------------> 1
*
* 1 ------------------------[ TO ]-----------------------> 2
*
* 2 ---------------------[ old name ]--------------------> 3
*
* 3 ------------------------[ , ]------------------------> 0
* 3 -----------------------[ else ]----------------------> (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) {
$expr->old = Expression::parse(
$parser,
$list,
array(
'breakOnAlias' => true,
'parseField' => 'table',
)
);
if (empty($expr->old)) {
$parser->error(
__('The old name of the table was expected.'),
$token
);
}
$state = 1;
} elseif ($state === 1) {
if (($token->type === Token::TYPE_KEYWORD) && ($token->value === 'TO')) {
$state = 2;
} else {
$parser->error(
__('Keyword "TO" was expected.'),
$token
);
break;
}
} elseif ($state === 2) {
$expr->new = Expression::parse(
$parser,
$list,
array(
'breakOnAlias' => true,
'parseField' => 'table',
)
);
if (empty($expr->new)) {
$parser->error(
__('The new name of the table was expected.'),
$token
);
}
$state = 3;
} elseif ($state === 3) {
if (($token->type === Token::TYPE_OPERATOR) && ($token->value === ',')) {
$ret[] = $expr;
$expr = new RenameOperation();
$state = 0;
} else {
break;
}
}
}
if ($state !== 3) {
$parser->error(
__('A rename operation was expected.'),
$list->tokens[$list->idx - 1]
);
}
// Last iteration was not saved.
if (!empty($expr->old)) {
$ret[] = $expr;
}
--$list->idx;
return $ret;
}
/**
* @param RenameOperation $component The component to be built.
* @param array $options Parameters for building.
*
* @return string
*/
public static function build($component, array $options = array())
{
if (is_array($component)) {
return implode(', ', $component);
} else {
return $component->old . ' TO ' . $component->new;
}
}
}