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<?php
/**
* `ALTER` statement.
*
* @package SqlParser
* @subpackage Statements
*/
namespace SqlParser\Statements;
use SqlParser\Parser;
use SqlParser\Statement;
use SqlParser\Token;
use SqlParser\TokensList;
use SqlParser\Components\AlterOperation;
use SqlParser\Components\Expression;
use SqlParser\Components\OptionsArray;
/**
* `ALTER` statement.
*
* @category Statements
* @package SqlParser
* @subpackage Statements
* @author Dan Ungureanu <udan1107@gmail.com>
* @license http://opensource.org/licenses/GPL-2.0 GNU Public License
*/
class AlterStatement extends Statement
{
/**
* Table affected.
*
* @var Expression
*/
public $table;
/**
* Column affected by this statement.
*
* @var AlterOperation[]
*/
public $altered = array();
/**
* Options of this statement.
*
* @var array
*/
public static $OPTIONS = array(
'ONLINE' => 1,
'OFFLINE' => 1,
'IGNORE' => 2,
);
/**
* @param Parser $parser The instance that requests parsing.
* @param TokensList $list The list of tokens to be parsed.
*
* @return void
*/
public function parse(Parser $parser, TokensList $list)
{
++$list->idx; // Skipping `ALTER`.
$this->options = OptionsArray::parse(
$parser,
$list,
static::$OPTIONS
);
// Skipping `TABLE`.
$list->getNextOfTypeAndValue(Token::TYPE_KEYWORD, 'TABLE');
// Parsing affected table.
$this->table = Expression::parse(
$parser,
$list,
array(
'noAlias' => true,
'noBrackets' => true,
)
);
++$list->idx; // Skipping field.
/**
* The state of the parser.
*
* Below are the states of the parser.
*
* 0 -----------------[ alter operation ]-----------------> 1
*
* 1 -------------------------[ , ]-----------------------> 0
*
* @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) {
$this->altered[] = AlterOperation::parse($parser, $list);
$state = 1;
} elseif ($state === 1) {
if (($token->type === Token::TYPE_OPERATOR) && ($token->value === ',')) {
$state = 0;
}
}
}
}
/**
* @return string
*/
public function build()
{
$tmp = array();
foreach ($this->altered as $altered) {
$tmp[] = $altered::build($altered);
}
return 'ALTER ' . OptionsArray::build($this->options)
. ' TABLE ' . Expression::build($this->table)
. ' ' . implode(', ', $tmp);
}
}