1.5 KiB
SCL: Simple CAS Language
v0.3
SCL aims to be a human-friendly Computer Algebra System (CAS) inspired by maxima that feels like writing on paper. In its current state, SCL can be used as a functional programming language capable of performing simple arithmetic. The codebase is about 2,000 lines of handwritten C, including a parser, interpreter, and runtime. It uses a linked environment scoping model.
Usage
To download and run:
git clone https://git.signorovitch.org/scl/scl -b stable && cd scl
make release
./scl.out
For Development
git clone git@signorovitch.org:scl/scl --recurse-submodules && cd scl
make all test
./scl.out
If you wish to run tests, make sure to run git clone --recurse-submodules to
include the Unity test framework.
Note that tests are currently in poor use. I hope to amend this in the future.
Syntax
SCL's syntax will feel familiar to other functional programming languages.
> x = 3 + 3 * 3; x + 1
= 13
> f(x) x + 1
> f(1)
= 2
> (\(x) 2 * x)(5)
= 10
> f(g) g(2)
> f(\(x) 2 * x)
= 4
Here's a simple factorial function, using recursion:
> fac(n) = {
> f(n, a) = {
> if n == 1
> a
> else
> f(n - 1, a * n);
> }
>
> f(n, 1);
> }
SCL's syntax is quite flexible. The above function could be more concisely written as:
> fac(n) (n, 1) -> f(n, a) ? n == 1 a f(n - 1, a * n)