well, i seem to have something that might work

def asRGB(x):
    ifMask = Color_Step(x, 12.92 * 0.0031308)
    xFalse = 1 - ifMask) * x
    xTrue = ifMask* x
    return xFalse / Add(12.92, 0) + ((xTrue + .055) / Add(1.055, 0)) ** Add(2.4, 0)

def sRGB(x):
    ifMask = Color_Step (x, 0.0031308)
    xFalse = (1 - ifMask) * x
    xTrue = ifMask* x     
    return Add(12.92, 0) * xFalse + (Add(1.055, 0) * (xTrue ** (1/2.4))) - .055

edited to reverse the mask because i'm really not swift at this and easily turned around