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<?php |
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/** |
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* This file is part of PHP-Yacc package. |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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declare(strict_types=1); |
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namespace PhpYacc\Grammar; |
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use PhpYacc\Exception\LogicException; |
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use PhpYacc\Yacc\Production; |
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/** |
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* Class Symbol. |
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* |
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* @property null|Symbol $type |
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* @property mixed $value |
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* @property int $precedence |
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* @property int $associativity |
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* @property string $name |
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* @property int $terminal |
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*/ |
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class Symbol |
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{ |
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const UNDEF = 0; |
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const LEFT = 1; |
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const RIGHT = 2; |
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const NON = 3; |
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const MASK = 3; |
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const TERMINAL = 0x100; |
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const NON_TERMINAL = 0x200; |
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/** |
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* @var int |
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*/ |
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public $code; |
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/** |
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* @var null|Symbol |
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*/ |
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protected $_type; |
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/** |
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* @var mixed |
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*/ |
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protected $_value; |
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/** |
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* @var int |
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*/ |
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protected $_precedence; |
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/** |
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* @var int |
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*/ |
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protected $_associativity; |
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/** |
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* @var string |
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*/ |
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protected $_name; |
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/** |
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* @var bool |
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*/ |
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public $isTerminal = false; |
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/** |
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* @var bool |
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*/ |
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public $isnonterminal = false; |
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/** |
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* @var int |
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*/ |
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protected $_terminal = self::UNDEF; |
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/** |
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* Symbol constructor. |
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* |
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* @param int $code |
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* @param string $name |
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* @param null $value |
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* @param int $terminal |
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* @param int $precedence |
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* @param int $associativity |
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* @param Symbol|null $type |
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* |
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* @throws LogicException |
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*/ |
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public function __construct(int $code, string $name, $value = null, int $terminal = self::UNDEF, int $precedence = self::UNDEF, int $associativity = self::UNDEF, self $type = null) |
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{ |
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$this->code = $code; |
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$this->_name = $name; |
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$this->_value = $value; |
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$this->setTerminal($terminal); |
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$this->_precedence = $precedence; |
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$this->_associativity = $associativity; |
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$this->_type = $type; |
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} |
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/** |
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* @return bool |
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*/ |
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public function isNilSymbol(): bool |
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{ |
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return $this->_terminal === self::UNDEF; |
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} |
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/** |
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* @param $name |
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* |
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* @return mixed |
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*/ |
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public function __get($name) |
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{ |
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return $this->{'_'.$name}; |
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} |
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/** |
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* @param $name |
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* @param $value |
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*/ |
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public function __set($name, $value) |
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{ |
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$this->{'set'.$name}($value); |
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} |
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/** |
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* @param int $terminal |
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* |
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* @throws LogicException |
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*/ |
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public function setTerminal(int $terminal) |
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{ |
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$this->_terminal = $terminal; |
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if ($terminal === self::TERMINAL) { |
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$this->isTerminal = true; |
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$this->isnonterminal = false; |
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} elseif ($terminal === self::NON_TERMINAL) { |
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$this->isTerminal = false; |
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$this->isnonterminal = true; |
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} else { |
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$this->isTerminal = false; |
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$this->isnonterminal = false; |
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} |
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$this->setValue($this->_value); // force check to prevent issues |
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} |
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/** |
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* @param int $associativity |
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*/ |
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public function setAssociativity(int $associativity) |
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{ |
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$this->_associativity = $associativity; |
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} |
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/** |
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* @param int $precedence |
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*/ |
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public function setPrecedence(int $precedence) |
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{ |
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$this->_precedence = $precedence; |
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} |
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/** |
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* @param $value |
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* |
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* @throws LogicException |
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*/ |
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public function setValue($value) |
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{ |
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if ($this->isTerminal && !is_int($value)) { |
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throw new LogicException('Terminals value must be an integer, '.\gettype($value).' provided'); |
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} elseif ($this->isnonterminal && !($value instanceof Production || $value === null)) { |
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throw new LogicException('NonTerminals value must be a production, '.\gettype($value).' provided'); |
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} |
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$this->_value = $value; |
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} |
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/** |
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* @param Symbol|null $type |
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*/ |
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public function setType(self $type = null) |
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{ |
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$this->_type = $type; |
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} |
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/** |
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* @param int $flag |
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*/ |
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public function setAssociativityFlag(int $flag) |
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{ |
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$this->_associativity |= $flag; |
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} |
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} |
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Our type inference engine has found a suspicous assignment of a value to a property. This check raises an issue when a value that can be of a mixed type is assigned to a property that is type hinted more strictly.
For example, imagine you have a variable
$accountId
that can either hold an Id object or false (if there is no account id yet). Your code now assigns that value to theid
property of an instance of theAccount
class. This class holds a proper account, so the id value must no longer be false.Either this assignment is in error or a type check should be added for that assignment.