110 lines
3.4 KiB
Scheme
110 lines
3.4 KiB
Scheme
;;; -*-scheme-*-
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;;; Mes --- Maxwell Equations of Software
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;;; Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
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;;;
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;;; base.mes: This file is part of Mes.
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;;;
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;;; 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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;;; 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 Mes. If not, see <http://www.gnu.org/licenses/>.
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(define (identity x) x)
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(define else #t)
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;;; COND based
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(define-macro (or . x)
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(cond ;; COND
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((null? x) #f)
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((null? (cdr x)) (car x))
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(#t (list 'cond (list (car x)) ;; COND
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(list #t (cons 'or (cdr x)))))))
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(define-macro (and . x)
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(cond ((null? x) #t) ;; COND
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((null? (cdr x)) (car x))
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(#t (list 'cond (list (car x) (cons 'and (cdr x))) ;; COND
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'(#t #f)))))
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(define (not x)
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(cond (x #f) ;; COND
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(#t #t)))
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(define (equal? a b) ;; FIXME: only 2 arg
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(cond ((and (null? a) (null? b)) #t) ;; COND
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((and (pair? a) (pair? b))
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(and (equal? (car a) (car b))
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(equal? (cdr a) (cdr b))))
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((and (string? a) (string? b))
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(eq? (string->symbol a) (string->symbol b)))
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((and (vector? a) (vector? b))
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(equal? (vector->list a) (vector->list b)))
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(#t (eq? a b))))
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(define (memq x lst)
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(cond ((null? lst) #f) ;; COND
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((eq? x (car lst)) lst)
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(#t (memq x (cdr lst)))))
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(define (map f l . r)
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(cond ((null? l) '()) ;; COND
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((null? r) (cons (f (car l)) (map f (cdr l))))
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((null? (cdr r))
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(cons (f (car l) (caar r)) (map f (cdr l) (cdar r))))))
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;; IF based
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(define-macro (or . x)
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(if (null? x) #f ;; IF
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(if (null? (cdr x)) (car x) ;; IF
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(list 'if (car x) (car x)
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(cons* 'or (cdr x))))))
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(define-macro (and . x)
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(if (null? x) #t ;; IF
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(if (null? (cdr x)) (car x) ;; IF
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(list 'if (car x) (cons 'and (cdr x)) ;; IF
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#f))))
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(define (not x)
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(if x #f #t))
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(define (equal? a b) ;; FIXME: only 2 arg
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(if (and (null? a) (null? b)) #t ;; IF
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(if (and (pair? a) (pair? b))
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(and (equal? (car a) (car b))
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(equal? (cdr a) (cdr b)))
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(if (and (string? a) (string? b)) ;; IF
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(eq? (string->symbol a) (string->symbol b))
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(if (and (vector? a) (vector? b)) ;; IF
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(equal? (vector->list a) (vector->list b))
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(eq? a b))))))
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(define (memq x lst)
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(if (null? lst) #f ;; IF
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(if (eq? x (car lst)) lst ;; IF
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(memq x (cdr lst)))))
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(define guile? (not (pair? (current-module))))
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(define (map f l . r)
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(if (null? l) '() ;; IF
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(if (null? r) (cons (f (car l)) (map f (cdr l))) ;; IF
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(if (null? (cdr r)) ;; IF
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(cons (f (car l) (caar r)) (map f (cdr l) (cdar r)))))))
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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 (let bindings . rest)
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(cons* 'simple-let bindings rest))
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