php-rekenmachine

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<?php

class calc {
    
    const numregex = '[0-9]*\\.?[0-9]+';
    const grpregex = '\\([^()]*\\)';
    
    public function format($input) {
        return preg_replace('/[^\\/\\-0-9.+*()^=]+/','',$input);
    }
    
    public function evaluate($input, $format = true) {
        if($format) {            
            $input = $this->format($input);
        }
        
        //Remove double positive/negative identifiers.
        do{$input=str_replace(array('+-','-+'),'-',$input,$count);}while($count);
        do{$input=str_replace(array('++','--'),'+',$input,$count);}while($count);
        
        //Evaluate input between '(' and ')' operators
        while(preg_match('/'.self::grpregex.'/',$input,$match,PREG_OFFSET_CAPTURE)) {
            $input =
                substr($input,0,$match[0][1])
                .$this->evaluate(substr($match[0][0],1,-1),false)
                .substr($input,$match[0][1]+strlen($match[0][0]));
        }
        
        //Calculate the Y'th power of X
        while(preg_match('/('.self::numregex.')\\^([+-]?'.self::numregex.')/',$input,$match,PREG_OFFSET_CAPTURE)) {
            $y = pow(floatval($match[1][0]),floatval($match[2][0]));
            $input = substr($input,0,$match[0][1]).$y.substr($input,$match[0][1]+strlen($match[0][0]));            
        }
        
        //Multiply and Divisions
        while(preg_match('/('.self::numregex.')([\\*\\/])([+-]?'.self::numregex.')/',$input,$match,PREG_OFFSET_CAPTURE)) {
            if($match[2][0]=='*') {
                $y = floatval($match[1][0])*floatval($match[3][0]);
            } elseif($match[2][0]=='/') {
                $y = floatval($match[1][0])/floatval($match[3][0]);
            }
            $input = substr($input,0,$match[0][1]).$y.substr($input,$match[0][1]+strlen($match[0][0]));                    
        }
        
        //Add and Substract
        while(preg_match('/('.self::numregex.')([+-])([+-]?'.self::numregex.')/',$input,$match,PREG_OFFSET_CAPTURE)) {
            if($match[2][0]=='+') {
                $y = floatval($match[1][0])+floatval($match[3][0]);
            } elseif($match[2][0]=='-') {
                $y = floatval($match[1][0])-floatval($match[3][0]);
            }
            $input = substr($input,0,$match[0][1]).$y.substr($input,$match[0][1]+strlen($match[0][0]));                    
        }
        
        if(preg_match('/([+-]?'.self::numregex.')=([+-]?'.self::numregex.')/',$input,$match)) {
            $input = (floatval($match[1][0])==floatval($match[2][0]));
        } else {
            $input = floatval($input);
        }
        
        return $input;
    }

    public static function ulate($input) {
        return calc::ulator()->evaluate($input);
    }
    
    public static function ulator() {
        if(!isset($GLOBALS['_calc'])) {
            $GLOBALS['_calc'] = new self;
        }        
        return $GLOBALS['_calc'];
    }
    
}

?>

 
 

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