My programming language named JoLang. (Mainly created for fun)

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Overview

JoLang

status: not ready

So this is my programming language which I decided to name 'JoLang' (inspired by Jonathan and GoLang).

Features I implemented so far:

  • shell (REPL)
  • Comments
  • macros
  • operators
  • variables
  • functions (only at AST level )
  • function calls (only at AST level)
  • if statements (only at AST level)
  • loops (while and for) (only at AST level)

Currently, I am working on the parser and AST and between task to task, i add features to the shell. I haven't implemented an interpreter yet, but the shell.

Docs:

comments:

You can write a comment with the $ prefix. a comment ends at the end of the line. example:

$ some comment
$ another comment

macros:

%macro any_identifier replace_with

What does a macro do? every time that the preprocessor sees an instance of any_identifier, it immediately replaces it with replace_with. Note that any_identifier must be an identifier. For example: %macro 0 1 would not work, but %macro zero 1, would.

Example:

%macro hello "hello"

hello + "world"

the parser would not see the macro at all, but just "hello" + "world".

operators:

for example: ~v, !v (negate v), +v, -v, v1+v2, v1 % v2. The precedence of the operators is the same as in Python (Except !,+, -, ~ which have the highest precedence after ()).

variables:

variables are set like that:

variable = any_expression

note that assignment is considered an expression and not an assignment, so it's possible to do stuff like (a = 2) and also (a = b = c = 2) and even inplace operators (a += b -= c = 2) which will assign 2 to c and then subtract-assign c (2) from b, and then add-assign it back to a.

functions:

you can define a function by the following syntax:

func thing(arg1, arg2){
 $ statements
}

Note that there are no keyword-arguments.

function calls:

You can "call" any expression, ()(), 4(), (3 + 4)(3) "hello"(), etc.

But an error would be raised if a special __call__-like method was not defined.

if statements

You can define an if statements by this syntax: if(expression){body}. you can also add elif(expr){body} and else{body} blocks.

example:

if(a = thing()){
    do_with(a) $ a is the result of thing()
}
elif(a = another_thing()){
}
else {
}

loops

There are two types of loops, a for loop and a while loop. the while loop is written like while(cond){body} and the for loop is written like for(expr;expr;expr){body} where expr can be nothing (like (;;)). in case the for loop is defined as (;;) it would be equivalent to while(true).

examples:

while:

while(name = getname()){
    do_with(name)
}

for:

for(i=0;i<10;i += 1){ $ there is no i++ in jolang (yet)
    do_with(i)
}
Owner
Jonathan
Jonathan, just a typical Python programmer.
Jonathan
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