module Campa

Campa is a tiny LISP implementation.

The “benchmark” for this is to cover the specification established by the Paul Graham's article {paulgraham.com/rootsoflisp.html The Roots of Lisp}.

So the following functions are implemented in the runtime:

- (atom something)
- (car list)
- (cdr list)
- (cond (some-condition value) (another-condition another-value))
- (cons 'first '(second third))
- (defun fun-name (parameters list) 'body)
- (eq a-thing another-thing)
- (label meaning-of-life 42)
- (quote (some stuff))

Besides these core functions other two ones, also specified on The Roots of Lisp, are also implemented on tnis LISP:

- (cadr list) - and any variation possible (caaar, cadadar...)
- (list 'this 'creates 'a 'new 'list)

Those are all the functions necessary to implement an eval function able to interprete LISP by itself.

And to be sure that this is the case we have this implementation on {file:campa/core.cmp campa/core.cmp}.

Constants

CR_REGEX: caar, cddr, cadr, but not car or cdr
SYMBOL_LAMBDA: symbol for the lambda function
SYMBOL_OUT: symbol to reference the “stdout” in a Campa execution context
SYMBOL_QUOTE: symbol for the quote function
VERSION

Public Class Methods

root() click to toggle source

Returns a Pathname pointint to the root of the “gem”.

Useful for requiring and/or finding files that need to be read by the runtime.

# File lib/campa.rb, line 61
def self.root
  @root ||= Pathname.new File.expand_path(__dir__)
end