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Show HN: A programming language that uses only parentheses (github.com/cammckinnon)
55 points by c4m on April 26, 2012 | hide | past | favorite | 31 comments



See also CPAN's Acme::Bleach module (language written only in whitespace).

As a bonus, the Acme::Bleach module will take an existing perl program and convert it (overwrite it) with a version written in whitespace.

"The first time you run a program under use Acme::Bleach, the module removes all the unsightly printable characters from your source file. The code continues to work exactly as it did before, but now it looks like this:"

http://search.cpan.org/~dconway/Acme-Bleach-1.13/lib/Acme/Bl...


Interesting & related post on Perlmonks yesterday... The History of Acme::Bleach and Acme::EyeDrops - http://www.perlmonks.org/?node_id=967004

Also relevant is Damian's Rod::Logic module. Unfortunately this hasn't reached CPAN (yet!) but examples can be found in his talks (for eg: http://blip.tv/open-source-developers-conference/temporally-...)


  Error handling
  
  If your program has a runtime error or a compiletime error the interpreter
  will print "Parenthesis Mismatch" to standard output and then exit.
Priceless. The sad thing is that most "modern" programming language offer basically identical erro reporting.


A friend of mine in a compiler writing class produced a compiler with one error message ‘you lied to me when you told me this was a program’. —Pete Fenelon


Considering how numbers are represented, I'm reminded of John Horton Conway's article on Surreal Numbers, wherein he starts with an empty set and one rule, and derives the totality of all numbers. Could make for an interesting basis for a language.



That...is awesome. Will take some time to wrap my head around.


This looks like somebody made a mistake using sed on lisp code accidentally deleted everything but the parenthesis. I don't know which is cooler, this or brainfuck.


It could be an interesting problem to write a piece of code that performs one task when run as a Lisp program and another when run as Parenthetic. Or the same task even.


Bonus point if you also use interleaving whitespace [1] to hide yet another program.

[1] http://compsoc.dur.ac.uk/whitespace/


In pure functional programming, so well mentioned in some PG's articles, you have only functions - no numbers. You can make numbers from functions, though. Then, you may have a basis - a set of functions which are sufficient to represent arbitrarily complex algorithm, i.e., Turing complete set; see here - http://dkeenan.com/Lambda/ .

Such a set may consist from only one function. So, the whole program is a structure of calling that function. Writing down such a program, we obviously don't need to write the function - it comes by default; we only need to write the structure, which can be represented by ( and ) . In a different way, than what I see here, but still - one bit per parenthesis, very simple processor, lots of memory and lots of steps for simple operations - a Turing tarpit...


I can pass subtle messages to astute readers by carefully crafting parenthesis in blog posts. This should be fun.


I have two related ideas for a useless language, this is very close to the first one.

The first idea is that you normally use at least 2 symbols for a programming language, but you can in principle get away with just one. The "vanilla" form of this idea is to use the length of the processed string as the instruction itself -- that is, it has a bit pattern which gives you two symbols to play with in principle. Of course that's pretty ugly so you can instead do something slightly more "advanced" and use a non-character as a delimiter; the most obvious choice is file boundaries on a filesystem, but in principle any data structure boundary can be used.

The second useless language that I want to create is one which I'm not even completely sure works. The idea is that you have some number of nodes -- let's say 256 -- which each contain some number of bytes -- let's say 4. Those bytes represent two (node pointer, instruction) tuples. These get initialized to a definite 1KB prelude, and the computer starts at node 0. The instructions can also manipulate registers and a much larger memory space, and can load ints from that memory into other nodes, but the 1 KB is needed for the interpreter.

The idea for this useless language is that, the computer chooses one of the two tuples randomly, performs its instruction, and then goes to the node it points to. >:D

The basic idea is that all esoteric languages seem to be about "how do you program familiar thing X if you don't have Y?", but I have 256 instructions so I'll give you all sorts of wonderful functions to call on your registers. The problem is really just that the computer does not natively want to follow a deterministic path, and you have to "herd it" into that mentality.


You might be somewhat interested in my esoteric language, DevPerc: https://github.com/TazeTSchnitzel/DevPerc


If this is Lambda Calculus Tarpit like Turing Tarpit[1]? It seems like that to me.

[1]http://en.wikipedia.org/wiki/Esoteric_programming_language#T...


Last week there was the semicolon language (http://news.ycombinator.com/item?id=3854130), now parentheses. My guess is next week we'll see the tilde language.



My programming language that uses only ellipses got buried last week. Yes, a programming language with one character, and no whitespace.

http://listrophy.github.com/ellipsis/


Cool. A Brainfuck-ish langauge, but more powerful.

I initially thought it would have been a pain to write just the test programs, but I guess they were just programatically search-replaced from Lisp programs?


I am impressed by the purity. Takes homoiconicity to the next level.


Clojure 2


Hey! I made a programming language that only uses 1s and 0s... oh wait, never mind.


Wow. The first ever modern langage I have seen in years. :+p


You are a complete idiot :D (good fun thumbs up)


(.)(.)


exactly my thoughts, now I want a programming language that uses only boobs :)


Whats the point!!


This made my day


.-less


(Why?)


Seems like a "how can i design a bad intermediate language" project.




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