this post was submitted on 16 Jun 2023
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Programming Languages

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Hello!

This is the current Lemmy equivalent of https://www.reddit.com/r/ProgrammingLanguages/.

The content and rules are the same here as they are over there. Taken directly from the /r/ProgrammingLanguages overview:

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See /r/ProgrammingLanguages for specific examples

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As in /r/ProgrammingLanguages, we will have a thread every month where you can post PL-related projects you are working on. Unlike the main posts, this thread is much more lenient: you should post even if you only have minor updates or something tangentially related to programming languages.

How much progress have you made since last time? What new ideas have you stumbled upon, what old ideas have you abandoned? What new projects have you started? What are you working on?

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Also see: https://www.reddit.com/r/ProgrammingLanguages/comments/13x2iv3/june_2023_monthly_what_are_you_working_on_thread/

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[–] [email protected] 5 points 1 year ago (1 children)

A language designed around the idea of data mutation. Like, just doing data mutation. No functions, no stack, just here's some data and here's how it changes. It's very similar to imperative languages as you might guess, but it basically removes functions from the main data path and simplifies everything which leads to some weird syntax and features.

There are still functions in some ways via a trait system kind of like Rust (also where and polymorphism appears), but it's not quite the same.

I don't really know exactly how to explain it beyond that, so here's a snippet:

[Import]
std

[Data]
a :: Int = 4
b :: Int = 5
a_str :: &Char = []

[Mut]
std.out write "The sum of 4 and 6 is "
b += 1
a += b
a_str alloc_num_str a
std.out write a_str

Not that += here is not equivalent to a = a + b, but rather += is the name of a Numeric trait procedure. Using words I might call it add. It's a add b or with C++-esque syntax it's like (&c)->add(b) or something.

There is a File struct in the std module and a Write trait implemented for &Files that includes a write(&Char) procedure as well as an instance of an &File called "out." So to write a string of characters to stdout, you do std.out write <characters>

So from this, I can say that procedures in traits in this language are like mini versions of the stuff under [Mut] that you can call with parameters. These procedures can also have embedded C code which is how you interact with external stuff and how the core and standard libraries are implemented.

Trait and struct definitions go under [Type] and have their own syntax

Forcing all logic to be an explicit mutation of a singular datum may end up being the worst way to program ever, but it's at least a different way

[–] [email protected] 2 points 1 year ago* (last edited 1 year ago) (1 children)

Update: I wrote up a quick manual for the language explaining concepts in more depth and reworking the syntax

[–] [email protected] 1 points 1 year ago (1 children)

Here's a couple example programs.

hello_world.mjut

# Print a simple hello world message
let msg :: &Char = "Hello, world!\n"
mutate:
- stdout write msg

truth_machine.mjut

# Truth machine - if you input a 1, it prints 1 forever
# But a 0, it prints 0 & quits
let inp :: Char = 0
mutate:
- stdin alloc_read_line # Read data into stdin :: &Char
- inp := stdin:0
- inp -= '0'
- if inp - goto quit;
- forever:
    + stdout write "1"
    + goto forever
- quit:
    + stdout write "0"

I think I have it fleshed out enough to get a basic version working. I'll write up a lexer and parser tomorrow (it's after midnight, so actually today lol) probably

[–] [email protected] 2 points 1 year ago (1 children)
[–] [email protected] 1 points 1 year ago

Parser done. Time for Code Generation. I'm going to transpile to C for now