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<?php
/**
* `REPLACE` statement.
*/
namespace PhpMyAdmin\SqlParser\Statements;
use PhpMyAdmin\SqlParser\Components\Array2d;
use PhpMyAdmin\SqlParser\Components\IntoKeyword;
use PhpMyAdmin\SqlParser\Components\OptionsArray;
use PhpMyAdmin\SqlParser\Components\SetOperation;
use PhpMyAdmin\SqlParser\Parser;
use PhpMyAdmin\SqlParser\Statement;
use PhpMyAdmin\SqlParser\Token;
use PhpMyAdmin\SqlParser\TokensList;
/**
* `REPLACE` statement.
*
* REPLACE [LOW_PRIORITY | DELAYED]
* [INTO] tbl_name [(col_name,...)]
* {VALUES | VALUE} ({expr | DEFAULT},...),(...),...
*
* or
*
* REPLACE [LOW_PRIORITY | DELAYED]
* [INTO] tbl_name
* SET col_name={expr | DEFAULT}, ...
*
* or
*
* REPLACE [LOW_PRIORITY | DELAYED]
* [INTO] tbl_name
* [PARTITION (partition_name,...)]
* [(col_name,...)]
* SELECT ...
*
* @category Statements
*
* @license https://www.gnu.org/licenses/gpl-2.0.txt GPL-2.0+
*/
class ReplaceStatement extends Statement
{
/**
* Options for `REPLACE` statements and their slot ID.
*
* @var array
*/
public static $OPTIONS = array(
'LOW_PRIORITY' => 1,
'DELAYED' => 1
);
/**
* Tables used as target for this statement.
*
* @var IntoKeyword
*/
public $into;
/**
* Values to be replaced.
*
* @var Array2d
*/
public $values;
/**
* If SET clause is present
* holds the SetOperation.
*
* @var SetOperation[]
*/
public $set;
/**
* If SELECT clause is present
* holds the SelectStatement.
*
* @var SelectStatement
*/
public $select;
/**
* @return string
*/
public function build()
{
$ret = 'REPLACE ' . $this->options;
$ret = trim($ret) . ' INTO ' . $this->into;
if (! is_null($this->values) && count($this->values) > 0) {
$ret .= ' VALUES ' . Array2d::build($this->values);
} elseif (! is_null($this->set) && count($this->set) > 0) {
$ret .= ' SET ' . SetOperation::build($this->set);
} elseif (! is_null($this->select) && strlen($this->select) > 0) {
$ret .= ' ' . $this->select->build();
}
return $ret;
}
/**
* @param Parser $parser the instance that requests parsing
* @param TokensList $list the list of tokens to be parsed
*/
public function parse(Parser $parser, TokensList $list)
{
++$list->idx; // Skipping `REPLACE`.
// parse any options if provided
$this->options = OptionsArray::parse(
$parser,
$list,
static::$OPTIONS
);
++$list->idx;
/**
* The state of the parser.
*
* Below are the states of the parser.
*
* 0 ---------------------------------[ INTO ]----------------------------------> 1
*
* 1 -------------------------[ VALUES/VALUE/SET/SELECT ]-----------------------> 2
*
* @var int
*/
$state = 0;
for (; $list->idx < $list->count; ++$list->idx) {
/**
* Token parsed at this moment.
*
* @var 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) {
if ($token->type === Token::TYPE_KEYWORD
&& $token->keyword !== 'INTO'
) {
$parser->error('Unexpected keyword.', $token);
break;
}
++$list->idx;
$this->into = IntoKeyword::parse(
$parser,
$list,
array('fromReplace' => true)
);
$state = 1;
} elseif ($state === 1) {
if ($token->type === Token::TYPE_KEYWORD) {
if ($token->keyword === 'VALUE'
|| $token->keyword === 'VALUES'
) {
++$list->idx; // skip VALUES
$this->values = Array2d::parse($parser, $list);
} elseif ($token->keyword === 'SET') {
++$list->idx; // skip SET
$this->set = SetOperation::parse($parser, $list);
} elseif ($token->keyword === 'SELECT') {
$this->select = new SelectStatement($parser, $list);
} else {
$parser->error(
'Unexpected keyword.',
$token
);
break;
}
$state = 2;
} else {
$parser->error(
'Unexpected token.',
$token
);
break;
}
}
}
--$list->idx;
}
}