D--

The worse than D-tier language with cringe german slang keywords.

Do you want to print something? Call :O__(<Hello world!>)!

Do you want to define the scope, where in other languages you use brackets? Use avo ... cado, semi ... colon or a mix between them instead!

Boolean values are better depicted with smileys :) and :(. More keywords can be found in the examples tests/basic or the interpreter source code itself.

Based on the great blog series Let's Build A Simple Interpreter by Ruslan Pivak and a bit of boredom.

How to use

Run an example program

cargo run tests/basic/funny.dmm

You can append one of two possible arguments.

• --lexer prints the tokens produced by the lexer for the program
• --ast prints the AST tree

Humanoid mode

Set the environment variable USE_HUMANOIDS= to simulate a humanoid, who interprets your code! After a certain amount of AST nodes traversed, he becomes tired and asks you to evaluate his current AST node, e.g:

Xc, Ich kann nicht mehr... Zu was wertet dieser Ausdruck hier aus?
---------------
Symbols: {"n": Integer(1)}
If { condition: Compare { left: Variable { name: "n" }, right: Value { value: Integer
(0) }, compare_type: Equals }, execution: Block { children: [Return { expression: Val
ue { value: Integer(0) } }] } }
---------------

If you enter the wrong value, the program aborts =c. Otherwise he becomes happy again and will continue the interpret your program. If there is no return value, enter -.

Fibonacci example

A simple (and inefficient) recursive fibonacci program in D--.

hallo

funny fib(n) semi
    is n is 0 avo wirf 0 cado
    is n is 1 avo wirf 1 cado
    wirf fib(n - 2) + fib(n - 1)
colon

n = d;D(<How many numbers do you want?>)

:O__(<The first >, n, < Fibo numbers!>)

machma i uf 0
immawida i kleina n avo
    :O__(fib(i))
    machma i uf i + 1
cado


reicht dann auch mal