Viewing file:  DeleteStatement.php (11.4 KB) -rw-r--r--
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<?php
/**
* `DELETE` statement.
*/
declare(strict_types=1);
namespace PhpMyAdmin\SqlParser\Statements;
use PhpMyAdmin\SqlParser\Components\ArrayObj;
use PhpMyAdmin\SqlParser\Components\Condition;
use PhpMyAdmin\SqlParser\Components\Expression;
use PhpMyAdmin\SqlParser\Components\ExpressionArray;
use PhpMyAdmin\SqlParser\Components\JoinKeyword;
use PhpMyAdmin\SqlParser\Components\Limit;
use PhpMyAdmin\SqlParser\Components\OptionsArray;
use PhpMyAdmin\SqlParser\Components\OrderKeyword;
use PhpMyAdmin\SqlParser\Parser;
use PhpMyAdmin\SqlParser\Statement;
use PhpMyAdmin\SqlParser\Token;
use PhpMyAdmin\SqlParser\TokensList;
use function count;
use function stripos;
use function strlen;
/**
* `DELETE` statement.
*
* DELETE [LOW_PRIORITY] [QUICK] [IGNORE] FROM tbl_name
* [PARTITION (partition_name,...)]
* [WHERE where_condition]
* [ORDER BY ...]
* [LIMIT row_count]
*
* Multi-table syntax
*
* DELETE [LOW_PRIORITY] [QUICK] [IGNORE]
* tbl_name[.*] [, tbl_name[.*]] ...
* FROM table_references
* [WHERE where_condition]
*
* OR
*
* DELETE [LOW_PRIORITY] [QUICK] [IGNORE]
* FROM tbl_name[.*] [, tbl_name[.*]] ...
* USING table_references
* [WHERE where_condition]
*/
class DeleteStatement extends Statement
{
/**
* Options for `DELETE` statements.
*
* @var array
*/
public static $OPTIONS = [
'LOW_PRIORITY' => 1,
'QUICK' => 2,
'IGNORE' => 3,
];
/**
* The clauses of this statement, in order.
*
* @see Statement::$CLAUSES
*
* @var array
*/
public static $CLAUSES = [
'DELETE' => [
'DELETE',
2,
],
// Used for options.
'_OPTIONS' => [
'_OPTIONS',
1,
],
'FROM' => [
'FROM',
3,
],
'PARTITION' => [
'PARTITION',
3,
],
'USING' => [
'USING',
3,
],
'WHERE' => [
'WHERE',
3,
],
'ORDER BY' => [
'ORDER BY',
3,
],
'LIMIT' => [
'LIMIT',
3,
],
];
/**
* Table(s) used as sources for this statement.
*
* @var Expression[]
*/
public $from;
/**
* Joins.
*
* @var JoinKeyword[]
*/
public $join;
/**
* Tables used as sources for this statement.
*
* @var Expression[]
*/
public $using;
/**
* Columns used in this statement.
*
* @var Expression[]
*/
public $columns;
/**
* Partitions used as source for this statement.
*
* @var ArrayObj
*/
public $partition;
/**
* Conditions used for filtering each row of the result set.
*
* @var Condition[]
*/
public $where;
/**
* Specifies the order of the rows in the result set.
*
* @var OrderKeyword[]
*/
public $order;
/**
* Conditions used for limiting the size of the result set.
*
* @var Limit
*/
public $limit;
/**
* @return string
*/
public function build()
{
$ret = 'DELETE ' . OptionsArray::build($this->options);
if ($this->columns !== null && count($this->columns) > 0) {
$ret .= ' ' . ExpressionArray::build($this->columns);
}
if ($this->from !== null && count($this->from) > 0) {
$ret .= ' FROM ' . ExpressionArray::build($this->from);
}
if ($this->join !== null && count($this->join) > 0) {
$ret .= ' ' . JoinKeyword::build($this->join);
}
if ($this->using !== null && count($this->using) > 0) {
$ret .= ' USING ' . ExpressionArray::build($this->using);
}
if ($this->where !== null && count($this->where) > 0) {
$ret .= ' WHERE ' . Condition::build($this->where);
}
if ($this->order !== null && count($this->order) > 0) {
$ret .= ' ORDER BY ' . ExpressionArray::build($this->order);
}
if ($this->limit !== null && strlen((string) $this->limit) > 0) {
$ret .= ' LIMIT ' . Limit::build($this->limit);
}
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 `DELETE`.
// 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 ---------------------------------[ FROM ]----------------------------------> 2
* 0 ------------------------------[ table[.*] ]--------------------------------> 1
* 1 ---------------------------------[ FROM ]----------------------------------> 2
* 2 --------------------------------[ USING ]----------------------------------> 3
* 2 --------------------------------[ WHERE ]----------------------------------> 4
* 2 --------------------------------[ ORDER ]----------------------------------> 5
* 2 --------------------------------[ LIMIT ]----------------------------------> 6
*
* @var int
*/
$state = 0;
/**
* If the query is multi-table or not.
*
* @var bool
*/
$multiTable = false;
for (; $list->idx < $list->count; ++$list->idx) {
/**
* Token parsed at this moment.
*
* @var Token
*/
$token = $list->tokens[$list->idx];
// End of statement.
if ($token->type === Token::TYPE_DELIMITER) {
break;
}
if ($state === 0) {
if ($token->type === Token::TYPE_KEYWORD) {
if ($token->keyword !== 'FROM') {
$parser->error('Unexpected keyword.', $token);
break;
} else {
++$list->idx; // Skip 'FROM'
$this->from = ExpressionArray::parse($parser, $list);
$state = 2;
}
} else {
$this->columns = ExpressionArray::parse($parser, $list);
$state = 1;
}
} elseif ($state === 1) {
if ($token->type === Token::TYPE_KEYWORD) {
if ($token->keyword !== 'FROM') {
$parser->error('Unexpected keyword.', $token);
break;
} else {
++$list->idx; // Skip 'FROM'
$this->from = ExpressionArray::parse($parser, $list);
$state = 2;
}
} else {
$parser->error('Unexpected token.', $token);
break;
}
} elseif ($state === 2) {
if ($token->type === Token::TYPE_KEYWORD) {
if (stripos($token->keyword, 'JOIN') !== false) {
++$list->idx;
$this->join = JoinKeyword::parse($parser, $list);
// remain in state = 2
} else {
switch ($token->keyword) {
case 'USING':
++$list->idx; // Skip 'USING'
$this->using = ExpressionArray::parse($parser, $list);
$state = 3;
$multiTable = true;
break;
case 'WHERE':
++$list->idx; // Skip 'WHERE'
$this->where = Condition::parse($parser, $list);
$state = 4;
break;
case 'ORDER BY':
++$list->idx; // Skip 'ORDER BY'
$this->order = OrderKeyword::parse($parser, $list);
$state = 5;
break;
case 'LIMIT':
++$list->idx; // Skip 'LIMIT'
$this->limit = Limit::parse($parser, $list);
$state = 6;
break;
default:
$parser->error('Unexpected keyword.', $token);
break 2;
}
}
}
} elseif ($state === 3) {
if ($token->type === Token::TYPE_KEYWORD) {
if ($token->keyword === 'WHERE') {
++$list->idx; // Skip 'WHERE'
$this->where = Condition::parse($parser, $list);
$state = 4;
} else {
$parser->error('Unexpected keyword.', $token);
break;
}
} else {
$parser->error('Unexpected token.', $token);
break;
}
} elseif ($state === 4) {
if ($multiTable === true
&& $token->type === Token::TYPE_KEYWORD
) {
$parser->error(
'This type of clause is not valid in Multi-table queries.',
$token
);
break;
}
if ($token->type === Token::TYPE_KEYWORD) {
switch ($token->keyword) {
case 'ORDER BY':
++$list->idx; // Skip 'ORDER BY'
$this->order = OrderKeyword::parse($parser, $list);
$state = 5;
break;
case 'LIMIT':
++$list->idx; // Skip 'LIMIT'
$this->limit = Limit::parse($parser, $list);
$state = 6;
break;
default:
$parser->error('Unexpected keyword.', $token);
break 2;
}
}
} elseif ($state === 5) {
if ($token->type === Token::TYPE_KEYWORD) {
if ($token->keyword === 'LIMIT') {
++$list->idx; // Skip 'LIMIT'
$this->limit = Limit::parse($parser, $list);
$state = 6;
} else {
$parser->error('Unexpected keyword.', $token);
break;
}
}
}
}
if ($state >= 2) {
foreach ($this->from as $from_expr) {
$from_expr->database = $from_expr->table;
$from_expr->table = $from_expr->column;
$from_expr->column = null;
}
}
--$list->idx;
}
}
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