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<?php |
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/** |
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* `SET` keyword parser. |
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*/ |
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namespace SqlParser\Components; |
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use SqlParser\Component; |
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use SqlParser\Parser; |
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use SqlParser\Token; |
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use SqlParser\TokensList; |
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/** |
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* `SET` keyword parser. |
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* |
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* @category Keywords |
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* |
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* @license https://www.gnu.org/licenses/gpl-2.0.txt GPL-2.0+ |
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*/ |
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class SetOperation extends 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 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 $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 = array(); |
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$expr = new self(); |
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/** |
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* The state of the parser. |
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* |
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* Below are the states of the parser. |
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* |
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* 0 -------------------[ column name ]-------------------> 1 |
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* |
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* 1 ------------------------[ , ]------------------------> 0 |
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* 1 ----------------------[ value ]----------------------> 1 |
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* |
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* @var int |
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*/ |
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$state = 0; |
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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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* @var Token |
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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) || ($token->type === Token::TYPE_COMMENT)) { |
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continue; |
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} |
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// No keyword is expected. |
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if (($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 ($state === 0) { |
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if ($token->token === '=') { |
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$state = 1; |
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} elseif ($token->value !== ',') { |
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$expr->column .= $token->token; |
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} |
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} elseif ($state === 1) { |
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$tmp = Expression::parse( |
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$parser, |
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$list, |
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array( |
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'breakOnAlias' => true, |
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) |
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); |
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if ($tmp == null) { |
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1 |
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$parser->error(__('Missing expression.'), $token); |
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1 |
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break; |
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} |
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$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 self(); |
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$state = 0; |
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} |
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} |
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--$list->idx; |
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return $ret; |
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} |
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/** |
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* @param SetOperation|SetOperation[] $component the component to be built |
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* @param array $options parameters for building |
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* |
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* @return string |
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*/ |
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public static function build($component, array $options = array()) |
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{ |
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if (is_array($component)) { |
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return implode(', ', $component); |
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} else { |
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return $component->column . ' = ' . $component->value; |
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} |
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} |
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} |
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phpmyadmin /
sql-parser
