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Lulu Cathrinus Grimalkin erkin

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Retrocomputing enthusiast, Lisp hobbyist, Unix user

erkin / regexp-checker.rkt

Created October 30, 2020 23:04

A graphical regular expression checker in plain Racket, supports PCRE

	#lang racket/base
	(require racket/gui/base
	racket/class
	racket/list
	racket/string)

	(define program-name "regexp-checker")
	(define program-version "v0.1")

	(define version-message

erkin / sudoku.rkt

Created December 11, 2020 23:40

Nondeterministic sudoku solver

	#lang racket

	(module amb racket/base
	(provide amb assert!)
	(define-syntax-rule (pop! stack)
	(begin0 (car stack) (set! stack (cdr stack))))
	(define-syntax-rule (push! v stack)
	(set! stack (cons v stack)))
	(define (U f) (f f))

erkin / little-macros.ss

Last active April 7, 2021 17:08

Useful Scheme macros I keep rewriting for every project

	(define-syntax define-syntax-rule
	(syntax-rules ()
	((_ (name args ...) body)
	(define-syntax name
	(syntax-rules ()
	((name args ...) body))))))

	(define-syntax-rule (do-times n . body)
	(do ((i n (sub1 i)))
	((< i 1))

erkin / csexp.scm

Last active October 14, 2022 07:18

Canonical S-expression parser