jonasuj/crab

It's another language... It takes a lot of inspiration from console.py

Introduction

It's called Crab because it can be confused with crap. Why you'd ever use this for anything is beyond my comprehension, but here it is nonetheless. This started as a console replica, but as with the Windows console, you can create .bat files which will execute a bunch of commands automatically. I soon realized that this could become some sort of language, but it didn't quite work as i wanted it to, so i started anew and abandon the old project: https://github.com/JonasUJ/console

NOTE

About 1 year later me speaking: My adventures on the internet took me across LISP... This seems to be almost the same language as Crab ¯\(ツ)/¯, what can I say other than that someone obviously stole my idea.

Crab

The new project is a bunch of methods and a parser that calls the methods. The keyword cal has a specific method do_cal which is called when the parser finds a cal in the code. The methods also get some arguments, ofcourse, cal 2 * 4 calls do_cal with the arguments 2, * and 4. do_cal then does something and returns a value, the value is then directly placed in the code and the parser moves on.

This means that this:

cal 1 + 2 * 3

Becomes:

7

Which isn't very useful since we don't do anything with the 7, just put it in the code until the program finishes executing.

Embeds

This is where embeds come in, they let you have multiple commands on one line. They work by basically replacing the embed with the returned value and thereby creating a new command. We can use this to output the 7:

cout {cal 1 + 2 * 3}

Will become:

cout 7

Which doesn't return anything, but cout outputs its arguments to the console. You can also have embeds inside other embeds:

cout {cal 5 * {cal 5 - 3}}

This outputs 10. Embedded embeds are executed recursivly from back to front inside out, if that makes sense. Here the are labelled 1-6 in order of execution:

6 {5 {4 {2} {1}} {3}}

Documentation

For documentation on what commands exists and how keywords behave take a look in the examples folder https://github.com/JonasUJ/crab/tree/master/Examples

crab's Issues

Embedded commands that cause errors

When an embedded command causes an error, it doesn't get handled very well. I've had scripts just stop without an error message because of this