Online PHP editor | rfc for G3eam

@ 2014-01-24T14:54:18Z

<?php

class ExpressionCalculator {
	private $operators = array();

	public function __construct() {
		$operators['+'] = function ($leftOperand, $rightOperand) {
            return $leftOperand + $rightOperand;
        };
        $operators['-'] = function ($leftOperand, $rightOperand) {
            return $leftOperand - $rightOperand;
        };
        $operators['*'] = function ($leftOperand, $rightOperand) {
            return $leftOperand * $rightOperand;
        };
        $operators['/'] = function ($leftOperand, $rightOperand) {
            return $leftOperand / $rightOperand;
        };
    }

	public function calc($expression) {
		$operands = array();

        while (($token = strtok($expression, ' ')) !== false) {
			if (isOperator($token)) {
				$rightOperand = array_pop($operands);
				$leftOperand = array_pop($operands);
                $result = $this->execute($token, $leftOperand, $rightOperand);
                array_push($operands, $result);
            } else if (is_numeric($token)) {
				array_push($operands, $token);
            } else {
				throw new InvalidArgumentException('Expression has invalid token: ' + $token);
            }
        }

		return $result;
    }

	private function isOperator($token) {
		return isset($operators[$token]);
    }

    private function execute($operator, $leftOperand, $rightOperand) {
		return call_user_func($operators[$operator], $leftOperand, $rightOperand);
    }
}

$calc = new ExpressionCalculator();
echo $calc->calc('5 1 2 + 4 * + 3 -'); // 14

Output for git.master, git.master_jit, rfc.property-hooks: Fatal error: Uncaught Error: Call to undefined function isOperator() in /in/G3eam:25 Stack trace: #0 /in/G3eam(50): ExpressionCalculator->calc('5 1 2 + 4 * + 3...') #1 {main} thrown in /in/G3eam on line 25
Process exited with code 255.

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