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@skx skx released this 16 Jul 08:35
· 502 commits to master since this release
v0.4.0
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Learn about vigilant mode.

This release is primarily focused upon testing and correctness:

  • We have 100% test-coverage of all our internal packages.
  • I've added support for the fuzz-testing which is available since v1.18 of the go release.

As a consequence of adding the test-coverage, and fuzzing the project for multiple hours, many many bugs and issues have been found and resolved - most of these were related to testing argument lengths for various sequences, and type-checks for functions. (e.g. (car 3) is an example of something that is obviously not supposed to work.)

New features introduced in this release:

  • # is added for exponent operations, and sqrt was provided in the standard library to use it.
  • inc and dec were embarrassingly implemented the wrong way round. Fixed now.
  • Added length to the standard library to return the number of items in a list.
  • Division by zero is caught explicitly.
  • The new sequence (error "This is wrong") was added, to allow user-driven termination of execution.
  • The ability to set a context.Context to the interpreter was added, which is useful to prevent DoS attacks against user-supplied scripts which never terminate.
  • ">" and "=" were rewritten in Lisp.
  • The ability to add optional arguments to functions was added, via the "&" prefix.

Here's what an optional argument looks like:

(define foo (lambda (a &b &c)
	(print "A:%s B:%s C:%s\n", a b c)))

(foo 1 2 3)
(foo 1 2 )
(foo 1 )
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