HAC - HAC Ada Compiler

HAC is perhaps the first open-source (albeit very partial) Ada compiler fully programmed in Ada itself.

Complete description in: doc/hac.txt

Command-line flavor:

If you are impatient: in Alire (https://alire.ada.dev/), do "alr get hac", then "alr run" from the hac* directory.

Alternatively: have GNAT installed (https://www.adacore.com/download), then, on your preferred command-line interpreter:

  gnatmake -P hac

  cd exm
  ../hac gallery.adb

(if gnatmake doesn't work, try gprbuild; for Windows, '\' is meant in place of '/' )

Editor / pre-built flavor:

Or, if you don't want to touch the command-line at all for playing with HAC, you can download and use LEA (http://l-e-a.sf.net/).

Examples

You'll find hundreds of HAC examples in the exm directory and its subdirectories. This includes six years of Advent of Code solutions. Many of the examples are also used in the regression test suite (130+ tests).

Here is the famous Hello World! File hello.adb:

with HAT;

procedure Hello is
begin
  HAT.Put ("Hello world!");
end Hello;

Another classic example (file fibo.adb):

with HAT;

procedure Fibo is

  function Fibonacci (P : Natural) return Positive is
  begin
    if P <= 2 then
      return 1;
    else
      return Fibonacci (P - 1) + Fibonacci (P - 2);
    end if;
  end Fibonacci;

  use HAT;

begin
  for i in 1 .. 22 loop
    Put_Line (Fibonacci (i));
  end loop;
end Fibo;

Enjoy!

License

HAC is free, open-source and released under the MIT license.