Serpent_3.0 - whilei/ethereumproject-wiki GitHub Wiki

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name: Serpent 3.0 category:

The following is a suggested spec for Serpent 3.0.

1. Everything is strongly typed, but types are inferred, so there is no need to specify types explicitly.

For example, consider the code:

data bar[6]

def foo():
    x = 5
    y = [1,2,3,4,5,6]
    z = "123123124"
    w1 = y[1]
    w2 = z[2] 
    self.bar = y
    return(x)

A script would run through the code and assign types:

x: int
y: arr[int]
z: string
w1: int
w2: int
self.bar: arr[int] :: storage

When checking the type for w1, the script would see the line w1 = y[1], note that y is already known as an arr[int] so y[1] will be recognized as int. Meanwhile, z will be known as string, and so z[1] will be recognized as a character, ie. int. Note that this means that y[1] will be compiled as (mload (add y 32)) whereas z[2] will be compiled as (byte (mload (add z 2)) 0). self.bar = y will be processed recursively so as to copy the entire contents of y into self.bar.