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<?php
namespace SqlParser\Fragments;
use SqlParser\Context;
use SqlParser\Fragment;
use SqlParser\Parser;
use SqlParser\Token;
use SqlParser\TokensList;
/**
* Parses a data type.
*
* @category Fragments
* @package SqlParser
* @subpackage Fragments
* @author Dan Ungureanu <udan1107@gmail.com>
* @license http://opensource.org/licenses/GPL-2.0 GNU Public License
*/
class DataTypeFragment extends Fragment
{
public static $OPTIONS = array(
'BINARY' => 1,
'CHARACTER SET' => array(2, 'var'),
'CHARSET' => array(2, 'var'),
'COLLATE' => 3,
'UNSIGNED' => 4,
'ZEROFILL' => 5,
);
/**
* The name of the data type.
*
* @var string
*/
public $name;
/**
* The size of this data type.
*
* @var array
*/
public $size = array();
/**
* The options of this data type.
*
* @var OptionsFragment
*/
public $options = array();
/**
* @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 DataTypeFragment[]
*/
public static function parse(Parser $parser, TokensList $list, array $options = array())
{
$ret = new DataTypeFragment();
/**
* The state of the parser.
*
* Below are the states of the parser.
*
* 0 -------------------[ data type ]--------------------> 1
*
* 1 ----------------[ size and options ]----------------> 2
*
* @var int
*/
$state = 0;
for (; $list->idx < $list->count; ++$list->idx) {
/**
* Token parsed at this moment.
* @var Token
*/
$token = $list->tokens[$list->idx];
// Skipping whitespaces and comments.
if (($token->type === Token::TYPE_WHITESPACE) || ($token->type === Token::TYPE_COMMENT)) {
continue;
}
if ($state === 0) {
$ret->name = strtoupper($token->value);
if (($token->type !== Token::TYPE_KEYWORD) || (!($token->flags & Token::FLAG_KEYWORD_DATA_TYPE))) {
$parser->error('Unrecognized data type.', $token);
}
$state = 1;
} elseif ($state === 1) {
if (($token->type === Token::TYPE_OPERATOR) && ($token->value === '(')) {
$size = ArrayFragment::parse($parser, $list);
++$list->idx;
$ret->size = (($ret->name === 'ENUM') || ($ret->name === 'SET')) ?
$size->raw : $size->array;
}
$ret->options = OptionsFragment::parse($parser, $list, static::$OPTIONS);
++$list->idx;
break;
}
}
if (empty($ret->name)) {
return null;
}
--$list->idx;
return $ret;
}
}
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