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<?php
/**
* `SET` keyword parser.
*/
namespace PhpMyAdmin\SqlParser\Components;
use PhpMyAdmin\SqlParser\Component;
use PhpMyAdmin\SqlParser\Parser;
use PhpMyAdmin\SqlParser\Token;
use PhpMyAdmin\SqlParser\TokensList;
/**
* `SET` keyword parser.
*
* @category Keywords
*
* @license https://www.gnu.org/licenses/gpl-2.0.txt GPL-2.0+
*/
class SetOperation extends Component
{
/**
* The name of the column that is being updated.
*
* @var string
*/
public $column;
/**
* The new value.
*
* @var string
*/
public $value;
/**
* Constructor.
*
* @param string $column Field's name..
* @param string $value new value
*/
public function __construct($column = '', $value = '')
{
$this->column = $column;
$this->value = $value;
}
/**
* @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 SetOperation[]
*/
public static function parse(Parser $parser, TokensList $list, array $options = array())
{
$ret = array();
$expr = new self();
/**
* The state of the parser.
*
* Below are the states of the parser.
*
* 0 ---------------------[ col_name ]--------------------> 0
* 0 ------------------------[ = ]------------------------> 1
* 1 -----------------------[ value ]---------------------> 1
* 1 ------------------------[ , ]------------------------> 0
*
* @var int
*/
$state = 0;
/**
* Token when the parser has seen the latest comma
*
* @var Token
*/
$commaLastSeenAt = null;
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) || ($token->type === Token::TYPE_COMMENT)) {
continue;
}
// No keyword is expected.
if (($token->type === Token::TYPE_KEYWORD)
&& ($token->flags & Token::FLAG_KEYWORD_RESERVED)
&& ($state === 0)
) {
break;
}
if ($state === 0) {
if ($token->token === '=') {
$state = 1;
} elseif ($token->value !== ',') {
$expr->column .= $token->token;
} elseif ($token->value === ',') {
$commaLastSeenAt = $token;
}
} elseif ($state === 1) {
$tmp = Expression::parse(
$parser,
$list,
array(
'breakOnAlias' => true
)
);
if (is_null($tmp)) {
$parser->error('Missing expression.', $token);
break;
}
$expr->column = trim($expr->column);
$expr->value = $tmp->expr;
$ret[] = $expr;
$expr = new self();
$state = 0;
$commaLastSeenAt = null;
}
}
--$list->idx;
// We saw a comma, but didn't see a column-value pair after it
if ($commaLastSeenAt !== null) {
$parser->error('Unexpected token.', $commaLastSeenAt);
}
return $ret;
}
/**
* @param SetOperation|SetOperation[] $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 implode(', ', $component);
}
return $component->column . ' = ' . $component->value;
}
}