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;;; GNU Mes --- Maxwell Equations of Software
;;; Copyright © 2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
;;;
;;; This file is part of GNU Mes.
;;;
;;; GNU Mes is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Mes is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Mes. If not, see <http://www.gnu.org/licenses/>.
(define (cons* . rest)
(if (null? (cdr rest)) (car rest)
(cons (car rest) (core:apply cons* (cdr rest) (current-module)))))
(define (caar x) (car (car x)))
(define (cadr x) (car (cdr x)))
(define (cdar x) (cdr (car x)))
(define (cddr x) (cdr (cdr x)))
(define (symbol? x)
(eq? (core:type x) <cell:symbol>))
(define (map f lst)
(if (null? lst) (list)
(cons (f (car lst)) (map f (cdr lst)))))
(define-macro (simple-let bindings . rest)
(cons (cons 'lambda (cons (map car bindings) rest))
(map cadr bindings)))
;; (define-macro (xsimple-let bindings rest)
;; `(,`(lambda ,(map car bindings) ,@rest)
;; ,@(map cadr bindings)))
(define-macro (xsimple-let bindings rest)
(cons* (cons* (quote lambda)
(map car bindings) (append2 rest (quote ())))
(append2 (map cadr bindings) (quote ()))))
;; (define-macro (xnamed-let name bindings rest)
;; `(simple-let ((,name *unspecified*))
;; (set! ,name (lambda ,(map car bindings) ,@rest))
;; (,name ,@(map cadr bindings))))
(define-macro (xnamed-let name bindings rest)
(list (quote simple-let)
(list (cons* name (quote (*unspecified*))))
(list (quote set!)
name
(cons* (quote lambda)
(map car bindings)
(append2 rest (quote ()))))
(cons* name (append2 (map cadr bindings) (quote ())))))
;; (define-macro (let bindings-or-name . rest)
;; (if (symbol? bindings-or-name)
;; `(xnamed-let ,bindings-or-name ,(car rest) ,(cdr rest))
;; `(xsimple-let ,bindings-or-name ,rest)))
(define-macro (let bindings-or-name . rest)
(if (symbol? bindings-or-name) (list (quote xnamed-let) bindings-or-name (car rest) (cdr rest))
(list (quote xsimple-let) bindings-or-name rest)))
(define ss-memq-inner #f)
(define (ss-memq x lst)
(if (null? lst) #f ;; IF
(if (eq? x (car lst)) lst
(ss-memq-inner x (cdr lst)))))
(define (ss-memq-inner x lst)
(if (null? lst) #f ;; IF
(if (eq? x (car lst)) lst
(ss-memq-inner x (cdr lst)))))
(define (ss-list-head x n)
(if (= 0 n) '()
(cons (car x) (ss-list-head (cdr x) (- n 1)))))
;; (define (foo x y)
;; (cons x y))
;; (define (ss-list-head x n)
;; (if (= 0 n) '()
;; (foo (car x) (ss-list-head (cdr x) (- n 1)))))
(define (not x) (if x #f #t))
(define (string-split s c)
(let loop ((lst (string->list s)) (result '()))
(let ((rest (ss-memq c lst)))
(if (not rest) (append2 result (list (list->string lst)))
(loop (cdr rest)
(append2 result
(list (list->string (ss-list-head lst (- (length lst) (length rest)))))))))))
(core:display-error "*START*\n")
(string-split "foo bar" #\space)
(string-split "baz bla" #\space)
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