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<?php
/*
* This file is part of the webmozart/expression package.
*
* (c) Bernhard Schussek <bschussek@gmail.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Webmozart\Expression;
/**
* A logical expression.
*
* @since 1.0
*
* @author Bernhard Schussek <bschussek@gmail.com>
*/
interface Expression
{
/**
* Evaluates the expression with the given value.
*
* @param mixed $value A value.
*
* @return bool Returns `true` if the value satisfies the expression and
* `false` otherwise.
*/
public function evaluate($value);
/**
* Returns whether this expression is logically equivalent to another expression.
*
* @param Expression $other Some expression.
*
* @return bool Returns `true` if the expressions are logically equivalent
* and `false` otherwise.
*/
public function equivalentTo(Expression $other);
/**
* Returns a string representation of the expression.
*
* @return string The expression as string.
*/
public function toString();
}