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