my take on fraction for StoneStory RPG script language aka stonescript

Fraction.txt

//stonescript 2.9.2

// Fraction class 0.0.1

// based on the works of Boo
// This has to go in your /Components folder
//
// functions that start with an Uppercase letter should be considered public
// others are private / internal, and you should call them outside

var numerator   = 0
var denominator = 1

var safety_threshold = 32768

// initialize the object
// @var int num
// @var int denom
func Init(num, denom)
    numerator   = num
    denominator = denom

    ? denominator = 0
        denominator = 1

    simplify()

// add an other fraction to this one
// @var Fraction frac
func Add(frac)
    var gcd = Gcd(denominator, frac.denominator)

    numerator   = numerator * gcd + frac.numerator * gcd
    denominator = denominator * gcd + frac.denominator * gcd

    simplify()

// @var Fraction frac    
func Subtract(frac)
    var copy = frac.Clone()

    copy.MultiplyByInt(-1)
    Add(copy)

// @var int number
func MultiplyByInt(number)
    numerator = numerator * number
    simplify()


// @var Fraction frac
func Multiply(frac)
    numerator   = numerator   * frac.numerator
    denominator = denominator * frac.denominator

    simplify()

// @var Fraction frac
func Divide(frac)
    var inverse = frac.Inverse()

    Multipy(inverse)

// returns a copy
func Clone()
    var f = new Components/Fraction

    f.numerator = numerator
    f.denominator = denominator

    return f

func Inverse()
    var copy = Clone()
    
    // just filp the sides ;)
    copy.Init(denominator, numerator)

    return copy

func ToString()
    return numerator + "/" + denominator

// "divide" both numerator and denominator by a single integer
// @internal you shouldn't use it outside
// @var int number
func reduce(number)
    numerator   = numerator   / number
    denominator = denominator / number

func gcd(a, b)
    ? a = 0
        return b

    // yey recursion
    return gcd(b % a, a)

func simplify()
    ? denominator < 0
        reduce(-1)

    var gcd = gcd(numerator, denominator)

    numerator   = numerator   / gcd
    denominator = denominator / gcd