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<?php
/**
* This file is part of the MathExecutor package
*
* (c) Alexander Kiryukhin
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code
*/
namespace NXP;
use NXP\Classes\Calculator;
use NXP\Classes\Lexer;
use NXP\Classes\Token;
use NXP\Classes\TokenFactory;
/**
* Class MathExecutor
* @package NXP
*/
class MathExecutor
{
/**
* @var TokenFactory
*/
private $tokenFactory;
/**
* Base math operators
*/
public function __construct()
{
$this->addDefaults();
}
public function __clone()
{
$this->addDefaults();
}
/**
* Set default operands and functions
*/
protected function addDefaults()
{
$this->tokenFactory = new TokenFactory();
$this->tokenFactory->addOperator('NXP\Classes\Token\TokenPlus');
$this->tokenFactory->addOperator('NXP\Classes\Token\TokenMinus');
$this->tokenFactory->addOperator('NXP\Classes\Token\TokenMultiply');
$this->tokenFactory->addOperator('NXP\Classes\Token\TokenDivision');
$this->tokenFactory->addOperator('NXP\Classes\Token\TokenDegree');
$this->tokenFactory->addFunction('sin', 'sin');
$this->tokenFactory->addFunction('cos', 'cos');
$this->tokenFactory->addFunction('tn', 'tan');
$this->tokenFactory->addFunction('asin', 'asin');
$this->tokenFactory->addFunction('acos', 'acos');
$this->tokenFactory->addFunction('atn', 'atan');
$this->tokenFactory->addFunction('min', 'min', 2);
$this->tokenFactory->addFunction('max', 'max', 2);
$this->tokenFactory->addFunction('avg', function($arg1, $arg2) { return ($arg1 + $arg2) / 2; }, 2);
}
/**
* Add operator to executor
*
* @param string $operatorClass Class of operator token
* @return MathExecutor
*/
public function addOperator($operatorClass)
{
$this->tokenFactory->addOperator($operatorClass);
return $this;
}
/**
* Add function to executor
*
* @param string $name Name of function
* @param callable $function Function
* @param int $places Count of arguments
* @return MathExecutor
*/
public function addFunction($name, callable $function = null, $places = 1)
{
$this->tokenFactory->addFunction($name, $function, $places);
return $this;
}
/**
* Execute expression
*
* @param $expression
* @return int|float
*/
public function execute($expression)
{
$lexer = new Lexer($this->tokenFactory);
$tokensStream = $lexer->stringToTokensStream($expression);
$tokens = $lexer->buildReversePolishNotation($tokensStream);
$calculator = new Calculator();
$result = $calculator->calculate($tokens);
return $result;
}
}
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