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<?php
/**
* Parses the create definition of a partition.
*
* Used for parsing `CREATE TABLE` statement.
*
* @package SqlParser
* @subpackage Components
*/
namespace SqlParser\Components;
use SqlParser\Component;
use SqlParser\Parser;
use SqlParser\Token;
use SqlParser\TokensList;
/**
* Parses the create definition of a partition.
*
* Used for parsing `CREATE TABLE` statement.
*
* @category Components
* @package SqlParser
* @subpackage Components
* @author Dan Ungureanu <udan1107@gmail.com>
* @license http://opensource.org/licenses/GPL-2.0 GNU Public License
*/
class PartitionDefinition extends Component
{
/**
* All field options.
*
* @var array
*/
public static $OPTIONS = array(
'STORAGE ENGINE' => array(1, 'var'),
'ENGINE' => array(1, 'var'),
'COMMENT' => array(2, 'var'),
'DATA DIRECTORY' => array(3, 'var'),
'INDEX DIRECTORY' => array(4, 'var'),
'MAX_ROWS' => array(5, 'var'),
'MIN_ROWS' => array(6, 'var'),
'TABLESPACE' => array(7, 'var'),
'NODEGROUP' => array(8, 'var'),
);
/**
* Whether this entry is a subpartition or a partition.
*
* @var bool
*/
public $isSubpartition;
/**
* The name of this partition.
*
* @var string
*/
public $name;
/**
* The type of this partition (what follows the `VALUES` keyword).
*
* @var string
*/
public $type;
/**
* The expression used to defined this partition.
*
* @var Expression|string
*/
public $expr;
/**
* The subpartitions of this partition.
*
* @var PartitionDefinition[]
*/
public $subpartitions;
/**
* The options of this field.
*
* @var OptionsArray
*/
public $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 PartitionDefinition
*/
public static function parse(Parser $parser, TokensList $list, array $options = array())
{
$ret = new PartitionDefinition();
/**
* The state of the parser.
*
* Below are the states of the parser.
*
* 0 -------------[ PARTITION | SUBPARTITION ]------------> 1
*
* 1 -----------------------[ name ]----------------------> 2
*
* 2 ----------------------[ VALUES ]---------------------> 3
*
* 3 ---------------------[ LESS THAN ]-------------------> 4
* 3 ------------------------[ IN ]-----------------------> 4
*
* 4 -----------------------[ expr ]----------------------> 5
*
* 5 ----------------------[ options ]--------------------> 6
*
* 6 ------------------[ subpartitions ]------------------> (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) {
$ret->isSubpartition = ($token->type === Token::TYPE_KEYWORD) && ($token->value === 'SUBPARTITION');
$state = 1;
} elseif ($state === 1) {
$ret->name = $token->value;
// Looking ahead for a 'VALUES' keyword.
$idx = $list->idx;
$list->getNext();
$nextToken = $list->getNext();
$list->idx = $idx;
$state = ($nextToken->type === Token::TYPE_KEYWORD)
&& ($nextToken->value === 'VALUES')
? 2 : 5;
} elseif ($state === 2) {
$state = 3;
} elseif ($state === 3) {
$ret->type = $token->value;
$state = 4;
} elseif ($state === 4) {
if ($token->value === 'MAXVALUE') {
$ret->expr = $token->value;
} else {
$ret->expr = Expression::parse(
$parser,
$list,
array(
'parenthesesDelimited' => true,
'breakOnAlias' => true,
)
);
}
$state = 5;
} elseif ($state === 5) {
$ret->options = OptionsArray::parse($parser, $list, static::$OPTIONS);
$state = 6;
} elseif ($state === 6) {
if (($token->type === Token::TYPE_OPERATOR) && ($token->value === '(')) {
$ret->subpartitions = ArrayObj::parse(
$parser,
$list,
array(
'type' => 'SqlParser\\Components\\PartitionDefinition'
)
);
++$list->idx;
}
break;
}
}
--$list->idx;
return $ret;
}
/**
* @param PartitionDefinition|PartitionDefinition[] $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 "(\n" . implode(",\n", $component) . "\n)";
} else {
if ($component->isSubpartition) {
return trim('SUBPARTITION ' . $component->name . ' ' . $component->options);
} else {
$subpartitions = empty($component->subpartitions)
? '' : ' ' . PartitionDefinition::build($component->subpartitions);
return trim(
'PARTITION ' . $component->name
. (empty($component->type) ? '' : ' VALUES ' . $component->type . ' ' . $component->expr)
. $component->options . $subpartitions
);
}
}
}
}