A small language I'm writing to learn more about compilers/virtual machines/optimizers/type checkers/etc. without using dependencies.
- Playground plotting
- Playground backend
- Playground operator ligatures
- Language server (https://github.com/microsoft/vscode-extension-samples/tree/master/lsp-sample)
- Inline function optimizer
- Conditionals
- Units on numbers
- Better error messages
- Better type checking messages
Each line is considered its own statement, and can be:
- a mathematical expression
- a function definition
- a local variable assignment
Expressions looks like you would normally express math on paper. Here are some examples:
1 2 3
2 - 3 - 4
3 * 4 * 5
4 / 5 / 6
7^8
(1 2) * 3
Writing a number and then a variable will imply multiplication, as in:
x = 2
3x
Functions are local to whatever context you're currently in (top-level or another function). They become defined wherever you define them and are not hoisted (so you can only call them after you've declared them, there are no forward-declarations). They support implicit returns, so whatever the final expression in your function body will be what is returned. Here is an example:
f(x) = x * 3
You would then be able to call that function with:
f(x)
You can also define more complex functions using the multi-line layout, as in:
f(x) = {
y = x * 2
y 1
}
A couple of functions comes built-in to the runtime. Those include:
add(x, y)
- add two numbersdiv(x, y)
- divide two numbersexp(x, p)
- raise a number to a powerln(x)
- get the natural log of a numberlog(x)
- get the base10 log of a numbermod(x, y)
- get a number modulo a basemul(x, y)
- multiply two numbersneg(x)
- negate a numbersqrt(x)
- get the square root of a numbersub(x, y)
- subtract two numbers
There is support for local variables either at the top-level or inside a function. Local variables are only scoped to their current context and are not inherited by inner functions. They are untyped, as the only type at the moment is a number. Here are examples of setting and using local variables:
a = 5
f(a * 5)
For now you can run bin/math.ts [path/to/file]
or you can pipe a script into it, as in echo "1 2" | bin/math.ts
.