Opal - Programming language

Opal is an open source programming language created in 1994.

#799on PLDB

30Years Old

14Repos

Download source code:

git clone https://github.com/TU-Berlin/opal

OPAL (OPtimized Applicative Language) is a functional programming language first developed at the Technical University of Berlin.. Read more on Wikipedia...

Tags: programming language
Opal is developed on GitHub and has 13 stars
There are at least 14 Opal repos on GitHub
Early development of Opal happened in https://github.com/TU-Berlin
Opal is written in C, Tex, Tcl, Bourne shell, Lisp, Clojure, Perl, Bash, CMake, Vim script, Make, Lex, Java, Logos, Markdown
The Google BigQuery Public Dataset GitHub snapshot shows 9 users using Opal in 10 repos on GitHub
GitHub supports syntax highlighting for Opal
Read more about Opal on the web: 1.

Example from Linguist:

-- Deepak Chopra nonsense text generator
-- see https://github.com/StoneCypher/DeepakChopra_Opal/

starts = ["Experiential truth ", "The physical world ", "Non-judgment ", "Quantum physics "]
middles = ["nurtures an ", "projects onto ", "imparts reality to ", "constructs with "]
qualifiers = ["abundance of ", "the barrier of ", "self-righteous ", "potential "]
finishes = ["marvel.", "choices.", "creativity.", "actions."]

alert starts.sample + middles.sample + qualifiers.sample + finishes.sample

Example from Wikipedia:

IMPLEMENTATION GCD
   IMPORT Nat COMPLETELY
   DEF GCD(a,b) == IF a % b = 0 THEN b
                       ELSE IF a-b < b THEN GCD(b,a-b)
                           ELSE GCD(a-b,b)
                       FI
                   FI

Language features

Feature	Supported	Example	Token
Comments	✓	-- A comment
Line Comments	✓	-- A comment	--
Semantic Indentation	X