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<?php |
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/** |
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* Platine Expression |
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* |
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* Platine Expression is an expression parser, evaluator with support of custom |
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* operators and functions |
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* |
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* This content is released under the MIT License (MIT) |
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* |
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* Copyright (c) 2020 Platine Expression |
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* Copyright (c) Alexander Kiryukhin |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy |
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* of this software and associated documentation files (the "Software"), to deal |
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* in the Software without restriction, including without limitation the rights |
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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* copies of the Software, and to permit persons to whom the Software is |
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* furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included in all |
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* copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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* SOFTWARE. |
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*/ |
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/** |
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* @file Operator.php |
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* |
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* The Operator class |
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* |
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* @package Platine\Expression |
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* @author Platine Developers Team |
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* @copyright Copyright (c) 2020 |
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* @license http://opensource.org/licenses/MIT MIT License |
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* @link https://www.platine-php.com |
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* @version 1.0.0 |
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* @filesource |
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*/ |
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declare(strict_types=1); |
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namespace Platine\Expression; |
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use Closure; |
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use Platine\Expression\Exception\IncorrectExpressionException; |
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use ReflectionFunction; |
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/** |
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* @class Operator |
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* @package Platine\Expression |
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*/ |
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class Operator |
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{ |
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/** |
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* Number of function argument |
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* @var int |
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*/ |
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protected int $places = 0; |
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/** |
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* Create new instance |
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* @param string $operator The operator like =, >=, .. |
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* @param bool $isRightAssociative Whether the operator is or right associativity |
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* @param int $priority The priority of the operator |
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* @param callable $function The function to be called |
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*/ |
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public function __construct( |
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protected string $operator, |
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protected bool $isRightAssociative, |
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protected int $priority, |
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protected $function |
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) { |
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$this->operator = $operator; |
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$this->isRightAssociative = $isRightAssociative; |
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$this->priority = $priority; |
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$this->function = $function; |
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$reflection = new ReflectionFunction(Closure::fromCallable($function)); |
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$this->places = $reflection->getNumberOfParameters(); |
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} |
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/** |
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* Execute the expression for this operator |
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* @param Token[] $stack |
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* @return Token |
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*/ |
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public function execute(array &$stack): Token |
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{ |
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if (count($stack) < $this->places) { |
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throw new IncorrectExpressionException(sprintf( |
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'Incorrect number of function parameters, [%d] needed', |
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$this->places |
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)); |
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} |
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$args = []; |
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for ($i = 0; $i < $this->places; $i++) { |
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$token = array_pop($stack); |
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if ($token !== null) { |
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array_unshift($args, $token->getValue()); |
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} |
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} |
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$result = call_user_func_array($this->function, $args); |
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return new Token(Token::LITERAL, $result); |
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} |
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/** |
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* Return the operator |
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* @return string |
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*/ |
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public function getOperator(): string |
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{ |
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return $this->operator; |
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} |
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/** |
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* Whether is right associative |
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* @return bool |
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*/ |
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public function isRightAssociative(): bool |
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{ |
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return $this->isRightAssociative; |
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} |
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/** |
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* Return the priority |
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* @return int |
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*/ |
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public function getPriority(): int |
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{ |
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return $this->priority; |
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} |
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/** |
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* Return the function |
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* @return callable |
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*/ |
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public function getFunction(): callable |
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{ |
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return $this->function; |
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} |
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/** |
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* Return the number of parameters |
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* @return int |
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*/ |
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public function getPlaces(): int |
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{ |
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return $this->places; |
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} |
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} |
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platine-php /
expression
