Expression.php

<?php
/**
 *  Copyright (c) 2018 Webbing Brasil (http://www.webbingbrasil.com.br)
 *  All Rights Reserved
 *
 *  This file is part of the NomadLog Portal project.
 *
 *  @project NomadLog Portal
 *  @file Expression.php
 *  @author Danilo Andrade <danilo@webbingbrasil.com.br>
 *  @date 06/03/18 at 18:09
 *  @copyright  Copyright (c) 2018 Webbing Brasil (http://www.webbingbrasil.com.br)
 */

namespace App\MathParser;

use App\MathParser\Contracts\ExpressionContract;

/**
 * Class Expression
 * @package App\MathParser
 */
abstract class Expression implements ExpressionContract
{

    /**
     * @var string|Stack
     */
    protected $value = '';

    /**
     * Expression constructor.
     *
     * @param $value
     */
    public function __construct($value=null)
    {
        $this->value = $value;
    }

    /**
     * @return string
     */
    public function render()
    {
        return $this->value;
    }

    /**
     * @return int
     */
    public function getValue()
    {
        return $this->value;
    }

    public function __toString()
    {
        return $this->value;
    }
}