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<?php
/**
* `LIMIT` keyword parser.
*
* @package SqlParser
* @subpackage Components
*/
namespace SqlParserComponents;
use SqlParserComponent;
use SqlParserParser;
use SqlParserToken;
use SqlParserTokensList;
/**
* `LIMIT` 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 Limit extends Component
{
/**
* The number of rows skipped.
*
* @var int
*/
public $offset;
/**
* The number of rows to be returned.
*
* @var int
*/
public $rowCount;
/**
* Constructor.
*
* @param int $rowCount The row count.
* @param int $offset The offset.
*/
public function __construct($rowCount = 0, $offset = 0)
{
$this->rowCount = $rowCount;
$this->offset = $offset;
}
/**
* @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 Limit
*/
public static function parse(Parser $parser, TokensList $list, array $options = array())
{
$ret = new Limit();
$offset = false;
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) || ($token->type === Token::TYPE_COMMENT)) {
continue;
}
if (($token->type === Token::TYPE_KEYWORD) && ($token->flags & Token::FLAG_KEYWORD_RESERVED)) {
break;
}
if (($token->type === Token::TYPE_KEYWORD) && ($token->value === 'OFFSET')) {
if ($offset) {
$parser->error(__('An offset was expected.'), $token);
}
$offset = true;
continue;
}
if (($token->type === Token::TYPE_OPERATOR) && ($token->value === ',')) {
$ret->offset = $ret->rowCount;
$ret->rowCount = 0;
continue;
}
if ($offset) {
$ret->offset = $token->value;
$offset = false;
} else {
$ret->rowCount = $token->value;
}
}
if ($offset) {
$parser->error(
__('An offset was expected.'),
$list->tokens[$list->idx - 1]
);
}
--$list->idx;
return $ret;
}
/**
* @param Limit $component The component to be built.
* @param array $options Parameters for building.
*
* @return string
*/
public static function build($component, array $options = array())
{
if (empty($component->offset)) {
return $component->rowCount;
} else {
return $component->offset . ', ' . $component->rowCount;
}
}
}
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