SUS

A new functional programming language!

Get Started

Fork the repository or use the git clone command
Create any *.sus file
Run src/main.py in the terminal and pass your sus file as the first argument

cd src
python main.py my_program_name.sus

Replace my_program_name with the name of your SUS file!

Examples

Assignment

SUS uses intuitive keywords such as set and to for assigning variables values. This leaves the = for use as a comparison operator.

set x to 0
set y to x

SUS stores data in a python dictionary.

memory = {
    "x": Integer(0), # set x to 0
    "y": Integer(0), # set y to x
}

SUS also supports setting multiple variables at once.

Warning

This feature is unstable!

set x y to "hello"

Functions

Functions can pretty much do anything. Who even needs objects? SUS functions can take a fixed number of arguments and return Integer, Float, or Text data.

set x to add(1, 1) set y to add(x, 1)

There are enough arithmetic and boolean functions to write basic programs. The code below shows how a modulo operations works.

set x to 10 set y to 3 set z to add(x, multiply(-1, multiply(y, floor(multiply(x, power(y, -1))))))

Input Output

SUS uses functions to control IO. However, SUS is superior to all other languages when it comes to inferencing user input. SUS can automatically convert Text to Integer or Float depending on the type of the first argument.

set x to input(0)
output(x)

0 is an Integer making the value of x and Integer too

SUS can also read and write to files.

set file to read("one.sus")
write("two.sus", file)

set x to []
set i to 0
set z to input(0)
repeat z {
    set x to append(x, i)
    set i to add(i, 1)
    output(i)
}
set y to []
repeat (add(z, -1)) {
    set y to append(y, pop(x, -1))
}
sort(y)

Loops

While loops execute code if an expression evaluates to a positive number.

set i to 3
while (i) {
    output(i)
    set i to add(i, -1)
}

Loops can also be used as conditional if statements by repeating a loop 0 times or 1 time. The repeat keyword will repeat a code block a certain number of times.

set i to 0 repeat (2) { set i to add(i, 1) }
set x to 0 repeat (add(1,1)) { set x to add(x, 1) }
set b to "false" repeat (xor(0, 1)) { set b to "true" }

Lists

There are currently 4 functions for lists.

set x to []
set i to 0
repeat 3 {
    set x to append(x, i)
    set i to add(i, 1)
}
set y to []
repeat 2 {
    set y to append(y, pop(x, -1))
}
sort(y)

intfract/sus