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<?php
/**
* Parses an alter operation.
*
* @package SqlParser
* @subpackage Components
*/
namespace SqlParser\Components;
use SqlParser\Component;
use SqlParser\Parser;
use SqlParser\Token;
use SqlParser\TokensList;
/**
* Parses an alter operation.
*
* @category Components
* @package SqlParser
* @subpackage Components
* @author Dan Ungureanu <udan1107@gmail.com>
* @license http://opensource.org/licenses/GPL-2.0 GNU Public License
*/
class AlterOperation extends Component
{
/**
* All alter operations.
*
* @var array
*/
public static $OPTIONS = array(
'ADD' => 3,
'ALTER' => 3,
'ANALYZE' => 3,
'CHANGE' => 3,
'CHECK' => 3,
'COALESCE' => 3,
'CONVERT' => 3,
'DISABLE' => 3,
'DISCARD' => 3,
'DROP' => 3,
'ENABLE' => 3,
'IMPORT' => 3,
'MODIFY' => 3,
'OPTIMIZE' => 3,
'ORDER' => 3,
'PARTITION' => 3,
'REBUILD' => 3,
'REMOVE' => 3,
'RENAME' => 3,
'REORGANIZE' => 3,
'REPAIR' => 3,
'COLUMN' => 4,
'CONSTRAINT' => 4,
'DEFAULT' => 4,
'TO' => 4,
'BY' => 4,
'FOREIGN' => 4,
'FULLTEXT' => 4,
'KEY' => 4,
'KEYS' => 4,
'PARTITIONING' => 4,
'PRIMARY KEY' => 4,
'SPATIAL' => 4,
'TABLESPACE' => 4,
'INDEX' => 4,
'DEFAULT CHARACTER SET' => array(5, 'var'),
'DEFAULT CHARSET' => array(5, 'var'),
'COLLATE' => array(6, 'var'),
);
/**
* Options of this operation.
*
* @var OptionsArray
*/
public $options;
/**
* The altered field.
*
* @var Expression
*/
public $field;
/**
* Unparsed tokens.
*
* @var Token[]|string
*/
public $unknown = 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 AlterOperation
*/
public static function parse(Parser $parser, TokensList $list, array $options = array())
{
$ret = new AlterOperation();
/**
* Counts brackets.
* @var int $brackets
*/
$brackets = 0;
/**
* The state of the parser.
*
* Below are the states of the parser.
*
* 0 ---------------------[ options ]---------------------> 1
*
* 1 ----------------------[ field ]----------------------> 2
*
* 2 -------------------------[ , ]-----------------------> 0
*
* @var int
*/
$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 ($token->type === Token::TYPE_DELIMITER) {
break;
}
// Skipping comments.
if ($token->type === Token::TYPE_COMMENT) {
continue;
}
// Skipping whitespaces.
if ($token->type === Token::TYPE_WHITESPACE) {
if ($state === 2) {
// When parsing the unknown part, the whitespaces are
// included to not break anything.
$ret->unknown[] = $token;
}
continue;
}
if ($state === 0) {
$ret->options = OptionsArray::parse($parser, $list, static::$OPTIONS);
$state = 1;
} elseif ($state === 1) {
$ret->field = Expression::parse(
$parser,
$list,
array(
'noAlias' => true,
'noBrackets' => true,
)
);
if ($ret->field === null) {
// No field was read. We go back one token so the next
// iteration will parse the same token, but in state 2.
--$list->idx;
}
$state = 2;
} elseif ($state === 2) {
if ($token->type === Token::TYPE_OPERATOR) {
if ($token->value === '(') {
++$brackets;
} elseif ($token->value === ')') {
--$brackets;
} elseif (($token->value === ',') && ($brackets === 0)) {
break;
}
}
$ret->unknown[] = $token;
}
}
if ($ret->options->isEmpty()) {
$parser->error(
__('Unrecognized alter operation.'),
$list->tokens[$list->idx]
);
return null;
}
--$list->idx;
return $ret;
}
/**
* @param AlterOperation $component The component to be built.
*
* @return string
*/
public static function build($component)
{
$ret = OptionsArray::build($component->options) . ' ';
if (!empty($component->field)) {
$ret .= Expression::build($component->field) . ' ';
}
$ret .= TokensList::build($component->unknown);
return $ret;
}
}
|
