110 lines
4.3 KiB
Scheme
110 lines
4.3 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 (pair? x) (eq? (core:type x) <cell:pair>))
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(define (vector? x)
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(eq? (core:type x) <cell:vector>))
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(define-macro (cond . clauses)
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(list 'if (pair? clauses)
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(list (cons
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'lambda
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(cons
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'(test)
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(list (list 'if 'test
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(if (pair? (cdr (car clauses)))
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(if (eq? (car (cdr (car clauses))) '=>)
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(append2 (cdr (cdr (car clauses))) '(test))
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(list (cons 'lambda (cons '() (cons 'test (cdr (car clauses)))))))
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(list (cons 'lambda (cons '() (cons 'test (cdr (car clauses)))))))
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(if (pair? (cdr clauses))
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(cons 'cond (cdr clauses)))))))
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(car (car clauses)))))
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(define else #t)
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(define append append2)
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(define (not x) (if x #f #t))
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(define-macro (and . x)
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(if (null? x) #t
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(if (null? (cdr x)) (car x)
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(list (quote if) (car x) (cons (quote and) (cdr x))
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#f))))
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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 (memq x lst)
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(if (null? lst) #f
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(if (eq? x (car lst)) lst
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(memq x (cdr lst)))))
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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 (cadar x) (car (cdr (car x))))
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(define (cddar x) (cdr (cdr (car x))))
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(define (quasiquote-expand x)
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(core:display "quasiquote-expand x=") (core:display x) (core:display "\n")
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(cond ((vector? x) (list 'list->vector (quasiquote-expand (vector->list x))))
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((not (pair? x))
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(core:display "not pair!\n") (cons 'quote (cons x '())))
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((eq? (car x) 'quasiquote) (quasiquote-expand (quasiquote-expand
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(if (null? (cddr x)) (cadr x)
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(cons 'list (cdr x))))))
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((eq? (car x) 'unquote) (if (null? (cddr x)) (cadr x)
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(cons 'list (cdr x))))
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((and (pair? (car x)) (eq? (caar x) 'unquote-splicing))
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((lambda (d)
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(if (null? (cddar x)) (list 'append (cadar x) d)
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(list 'quote (append (cdar x) d))))
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(quasiquote-expand (cdr x))))
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(else
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(core:display "ELSje\n")
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(core:display "x=") (core:display x) (core:display "\n")
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(core:display "CAR x=") (core:display (car x))
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(core:display "\n")
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(core:display "CDR x=") (core:display (cdr x))
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(core:display "\n")
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((lambda (a d)
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(core:display "a=") (core:display a)
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(core:display "\n")
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(core:display "d=") (core:display d)
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(core:display "\n")
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(if (pair? d)
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(if (eq? (car d) 'quote)
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(if (and (pair? a) (eq? (car a) 'quote))
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(list 'quote (cons (cadr a) (cadr d)))
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(if (null? (cadr d))
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(list 'list a)
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(list 'cons* a d)))
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(if (memq (car d) '(list cons*))
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(cons (car d) (cons a (cdr d)))
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(list 'cons* a d)))
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(list 'cons* a d)))
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(quasiquote-expand (car x))
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(quasiquote-expand (cdr x))))))
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(core:display (quasiquote-expand #(42)))
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(core:display "\n")
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