Crisp

Crisp is an experimental language written in Ruby, using treetop.

Crisp has a Lisp syntax and immutable data structures.

The main purpose of the language is to deal with the issues and problems when creating your own programming language.

CI status

Language features

binding values to a symbol with def
calculations with +, -, * and /
comparisons with >, < and =
conditional statements with if
loop statements with loop/recur
lazy sequences with lazyseq and next/take/nth
console output with println
function creation with fn
switch/case conditions with cond
local binding with let
dynamic loading of crisp source files with load
head and tail functions for array with head and tail
calling native ruby with .

Example

    # crisp
    >> (println "Hello World")
    Hello World
    =>
    >> (def fib (
    ?>   fn [n]
    ?>     (if (< n 2)
    ?>       n
    ?>         (+ (fib (- n 1)) (fib (- n i))))))
    => #<Crisp::Function:0x1005c2500>
    >> (fib 10)
    => 55
    >> (def factorial
    ?>   (fn [n]
    ?>     (loop [cnt n acc 1]
    ?>       (if (= 0 cnt)
    ?>         acc
    ?>         (recur (- cnt 1) (* acc cnt))))))
    => #<Crisp::Function:0x1001ad9d8>
    >> (factorial 12)
    => 479001600

For more examples see the examples directory in the repository.

Installation

    gem install crisp

Usage

To start an interactive shell: crisp