Quite concise programming language

v1.0.3 2019-10-15 21:34 UTC

This package is auto-updated.

Last update: 2022-11-16 04:25:13 UTC


This piece of software is in EARLY development stage

The idea is to create a simple (in terms of complexity, not ease of use) programming language, that will have quite a concise syntax, that will play with the power of Unicode and most importantly -- will be fun to create ;)


Full documentation is available at docs.avris.it/qc

Sample code

This program returns the length of the Collatz sequence for a given number:

# Length of Collatz sequence

@0 => 1
@1 => 1
@2 => 2
@3 => 8
@4 => 3
@5 => 6
@[0 1 2 3 4 5] => [1 1 2 8 3 6]

First line is, obviously, just a comment, second one is the actual code, and the rest are test cases -- when you run your code in test mode, it will run for input 0 and check if the output is 1, then run for 1 and expect 1 as output, and so on. Notice, in the last case, how simply can a function be applied to every element of a whole array.

(⪑☯1:...) defines a function that takes 1 argument (= its arity is one) and allows our array trick ( switch).

{...:...} means: while the first part is true, keep executing part two.

A is a predefined variable containing an empty array. We put it on the stack.

a, b, c, d... are the parameters we passed to the function (here we only one one, a, because our arity is one).

We put the value of a (a⇓) on the stack.

Function takes two elements from the stack (i.e. A and a⇓) and puts a⇓ at the end of the array A.

We put on the stack the variable a and the number 1. Function > takes them off and compares. If a > 1, it puts 1 (true) back on the stack, and 0 (false) otherwise. So, that would be our while condition.

Then we have aa2%a3*1+a2/▲= which is basically a = a % 2 ? 3*a+1 : a/2, but written with Reverse Polish notation and with function acting as a teranry operator.

After the while loop is finished, we put the length of array A (A↹) on the stack. This is return value of our function. Of course, we could return the whole array (A) or its concatenated content (AS⥋).

I☯ means we put the input I on the stack, and apply our function to it.


Install it straight from Git repository or using Composer:

composer require avris/qc



Online interpreter is available at qc.avris.it/try

In console

vendor/bin/qc '2 2+'                        # 4
vendor/bin/qc '2 2+' -d                     # 4, debug data displayed
vendor/bin/qc '2 I+' 5                      # 7
vendor/bin/qc '"foo""bar"+'                 # "foobar"
vendor/bin/qc -f demo/collatz.qc 5          # 6, source code was read from file
vendor/bin/qc -f demo/collatz.qc -s         # run related test suite
vendor/bin/qc -f demo/collatz.qc 5 -dl 300  # debug mode with increased lines limit


try {
    $qc = new QC();
    $result = $qc->run($code, $input, new EchoOutput());
    echo 'Result: ' . $result;
} catch (QCException $e) {
    echo 'Error: ' . $e->getMessage();