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<?php |
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declare(strict_types=1); |
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namespace PhpMyAdmin\SqlParser\Components; |
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use PhpMyAdmin\SqlParser\Component; |
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use PhpMyAdmin\SqlParser\Parser; |
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use PhpMyAdmin\SqlParser\Token; |
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use PhpMyAdmin\SqlParser\TokensList; |
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use function implode; |
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use function trim; |
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/** |
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* `SET` keyword parser. |
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*/ |
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final class SetOperation implements Component |
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{ |
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/** |
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* The name of the column that is being updated. |
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* |
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* @var string |
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*/ |
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public $column; |
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/** |
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* The new value. |
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* |
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* @var string |
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*/ |
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public $value; |
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/** |
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* @param string $column Field's name.. |
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* @param string $value new value |
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*/ |
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public function __construct($column = '', $value = '') |
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{ |
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$this->column = $column; |
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$this->value = $value; |
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} |
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/** |
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* @param Parser $parser the parser that serves as context |
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* @param TokensList $list the list of tokens that are being parsed |
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* @param array<string, mixed> $options parameters for parsing |
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* |
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* @return SetOperation[] |
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*/ |
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public static function parse(Parser $parser, TokensList $list, array $options = []): array |
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{ |
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$ret = []; |
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$expr = new static(); |
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/** |
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* The state of the parser. |
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* |
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* Below are the states of the parser. |
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* |
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* 0 ---------------------[ col_name ]--------------------> 0 |
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* 0 ---------------------[ = or := ]---------------------> 1 |
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* 1 -----------------------[ value ]---------------------> 1 |
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* 1 ------------------------[ , ]------------------------> 0 |
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* |
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* @var int |
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*/ |
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$state = 0; |
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/** |
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* Token when the parser has seen the latest comma |
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* |
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* @var Token |
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*/ |
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$commaLastSeenAt = null; |
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for (; $list->idx < $list->count; ++$list->idx) { |
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/** |
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* Token parsed at this moment. |
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*/ |
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$token = $list->tokens[$list->idx]; |
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// End of statement. |
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if ($token->type === Token::TYPE_DELIMITER) { |
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break; |
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} |
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// Skipping whitespaces and comments. |
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if (($token->type === Token::TYPE_WHITESPACE) || ($token->type === Token::TYPE_COMMENT)) { |
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continue; |
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} |
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// No keyword is expected. |
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if ( |
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($token->type === Token::TYPE_KEYWORD) |
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&& ($token->flags & Token::FLAG_KEYWORD_RESERVED) |
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&& ($state === 0) |
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) { |
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break; |
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} |
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if ($state === 0) { |
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if (in_array($token->token, ['=', ':='], true)) { |
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$state = 1; |
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} elseif ($token->value !== ',') { |
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$expr->column .= $token->token; |
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} elseif ($token->value === ',') { |
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$commaLastSeenAt = $token; |
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} |
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} elseif ($state === 1) { |
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$tmp = Expression::parse( |
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$parser, |
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$list, |
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['breakOnAlias' => true] |
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); |
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if ($tmp === null) { |
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$parser->error('Missing expression.', $token); |
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break; |
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} |
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$expr->column = trim($expr->column); |
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$expr->value = $tmp->expr; |
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$ret[] = $expr; |
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$expr = new static(); |
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$state = 0; |
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$commaLastSeenAt = null; |
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} |
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} |
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--$list->idx; |
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// We saw a comma, but didn't see a column-value pair after it |
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if ($commaLastSeenAt !== null) { |
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$parser->error('Unexpected token.', $commaLastSeenAt); |
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} |
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return $ret; |
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} |
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/** |
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* @param SetOperation $component the component to be built |
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*/ |
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public static function build($component): string |
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{ |
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return $component->column . ' = ' . $component->value; |
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} |
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/** |
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* @param SetOperation[] $component the component to be built |
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*/ |
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public static function buildAll(array $component): string |
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{ |
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return implode(', ', $component); |
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} |
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public function __toString(): string |
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{ |
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return static::build($this); |
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} |
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} |
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phpmyadmin /
sql-parser
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