<?php

# Copyright (c) 2002-2005 Cunningham & Cunningham, Inc.
# Released under the terms of the GNU General Public License version 2 or later.
#
# PHP5 translation by Luis A. Floreani <luis.floreani@gmail.com>

require_once 'PHPFIT/Fixture/Column.php';
require_once 'PHPFIT/ScientificDouble.php';

class eg_Calculator extends PHPFIT_Fixture_Column 
{
    public $volts = 0.0;
    public $key = "";
    
    public static $hp;
    
    function __construct() {
        $this->hp = new HP35();
    }

    public function execute() {
        if ($this->key != "")
            $this->hp->key($this->key);
    }

    public function points() {
        return false;
    }
    
    public function flash() {
        return false;
    }
    
    public function watts() {
        return 0.5;
    }
    
    public function x() {
        return new PHPFIT_ScientificDouble($this->hp->r[0]);
    }
    
    public function y() {
        return new PHPFIT_ScientificDouble($this->hp->r[1]);
    }
    
    public function z() {
        return new PHPFIT_ScientificDouble($this->hp->r[2]);
    }
    
    public function t() {
        return new PHPFIT_ScientificDouble($this->hp->r[3]);
    }

    public $typeDict = array(
        "key" => "string",
        "volts" => "double",
        "points()" => "boolean",
        "flash()" => "boolean",
        "watts()" => "double",
        "x()" => "ScientificDouble",
        "y()" => "ScientificDouble",
        "z()" => "ScientificDouble",
        "t()" => "ScientificDouble"
    );    
    
}


class HP35 {
    public $r;
    public $s = 0;
    
    function __construct() {
        $this->r = array (0,0,0,0);
    }
    
    public function key($key) {
        if ($this->numeric($key)) {$this->pushValue(floatval($key));}
        else if ($key == "+") {$this->pushValue($this->pop() + $this->pop());}
        else if ($key == "-") {$t=$this->pop(); $this->push($this->pop()-$t);}
        else if ($key == "*") {$this->pushValue($this->pop() * $this->pop());}
        else if ($key == "enter") {$this->push();}
        else if ($key == "clx") {$this->r[0] = 0;}
        else if ($key == "/") {
            $t = $this->pop();
            if ($t != 0)
                $this->pushValue($this->pop()/$t);
        }
        else if ($key == "x^y") {$this->pushValue(exp(log($this->pop())*$this->pop()));}
        else if ($key == "clr") {$this->r[0] = 0;$this->r[1] = 0;$this->r[2] = 0;$this->r[3] = 0;}
        else if ($key == "chs") {$this->r[0] = -$this->r[0];}
        else if ($key == "sin") {$this->pushValue(sin(deg2rad($this->pop())));}
        else if ($key == "chs") {$this->r[0] = -$this->r[0];}
        else 
            throw new Exception("can't do key: " . $key);
            
    }
    
    public function numeric($key) {
        return is_numeric($key);
    }
    
    public function push() {
        for ($i=3; $i>0; $i--) {
            $this->r[$i] = $this->r[$i-1];
        }
    }
    
    public function pop() {
        $result = $this->r[0];
        for ($i=0; $i<3; $i++) {
            $this->r[$i] = $this->r[$i+1];
        }
        return $result;
    }
    
    public function pushValue($value) {
           $this->push();
        $this->r[0] = $value;
    }
    
}

?>