Rebel Language

• Rebel is a general-purpose programming language written in ANSI C.
• Rebel builds with make using Clang, GCC, or TCC.
• Rebel starts without initialization steps or external dependencies.
• Rebel provides one binary under 350 KB containing 370+ functions and an FFI interface.
• Rebel evaluates expressions as graphs of CELL objects.
• Rebel uses prefix expression syntax (Polish notation).
• Rebel avoids implicit behavior and hidden evaluation rules.
• Rebel does not target any language category.
• Rebel is Rebel.

• Core Programming & Flow Control
  • loops, conditionals, list processing, anonymous functional programming
• Strings & Data Manipulation
  • regex, parsing, conversion, unicode, text transformation
• Math & Statistics
  • integers, floats, linear algebra, special functions, probability, simulation
• File & I/O
  • file handling, directories, reading/writing, streams, HTTP file access
• Networking
  • TCP/IP, UDP, HTTP, JSON/XML, net-eval, sockets
• Processes & Multiprocessing
  • forks, Cilk-style API, IPC, semaphores, process management
• Reflection & Customization
  • macros, events, symbols, environment introspection
• Finance & Time
  • basic financial math, date and time functions
• Integration & Extensibility
  • import C libraries, extend interpreter, modular namespaces
• List of built-in functions

• BSD
• Linux
• macOS

To build Rebel on your system you need to have the following libraries installed:

• A readline library for line-editing and history support in the REPL
• A libffi installation for calling native C functions through the FFI interface

If you don't want these features, remove their references in the Makefile before building.

$: git clone https://github.com/ufko-org/rebel.git
$: cd rebel/src
$: make -f Makefile.[bsd|linux|macos]
$: ./rebel

$: ls -l rebel
-rwxr-xr-x  1 ufko  ufko  344560 Nov 19 23:32 rebel*

Rebel can change his running shoes mid-sprint.

gringo ~ $: rebel
Rebel on BSD IPv4/6 UTF-8 FFI. Options: rebel -h

> (func (sum x) (+ x x))
(fn (x) (+ x x))
> (sum 2)
4
> (list? sum)
true
> (set (nth 1 sum) '(- x x))
(- x x)
> (sum 2) ; surprise :D
0
>

Rebel remembers things

> (func (gen:gen) (inc 0))
(fn () (inc 0))
> (gen)
1
> (gen)
2
> (gen)
3
>

Rebel loves all C libraries

> (import "/path/to/libc.so" "printf")
printf@F3D306ED040
> (printf "Hello rebels :)\n")
Hello rebels :)
16
>

• Homepage: https://rebel-lang.org
• Codeberg repo (primary): https://codeberg.org/ufko/rebel
• Github repo (mirror): https://github.com/ufko-org/rebel
• DeepWiki analysis: https://deepwiki.com/ufko-org/rebel