95 lines
3.6 KiB
Scheme
95 lines
3.6 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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;;; 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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;;; Commentary:
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;;; quasiquote.mes is loaded after base. It provides quasiquote
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;;; written in Scheme.
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;;; Code:
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(mes-use-module (mes base))
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(define-macro (quasiquote x)
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(define (check x)
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(cond ((pair? (cdr x)) (cond ((null? (cddr x)))
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(#t (error (car x) "invalid form ~s" x))))))
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(define (loop x)
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;;(display "LOOP") (newline)
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(cond
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((not (pair? x)) (cons 'quote (cons x '())))
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((eq? (car x) 'quasiquote) (check x) (loop (loop (cadr x))))
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((eq? (car x) 'unquote) (check x) (cadr x))
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((eq? (car x) 'unquote-splicing)
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(error 'unquote-splicing "invalid context for ~s" x))
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(;;(and (pair? (car x)) (eq? (caar x) 'unquote-splicing))
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(cond ((pair? (car x)) (eq? (caar x) 'unquote-splicing))
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(#t #f))
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(check (car x))
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;; (let ((d (loop (cdr x))))
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;; (cond ((equal? d '(quote ())) (cadar x))
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;; ;;(#t `(append ,(cadar x) ,d))
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;; (#t (list 'append (cadar x) d))
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;; ))
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((lambda (d)
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(list 'append (cadar x) d))
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(loop (cdr x))))
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(#t
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;; (let ((a (loop (car x)))
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;; (d (loop (cdr x))))
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;; (cond ((pair? d)
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;; (cond ((eq? (car d) 'quote)
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;; (cond ((and (pair? a) (eq? (car a) 'quote))
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;; `'(,(cadr a) . ,(cadr d)))
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;; (#t (cond ((null? (cadr d))
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;; `(list ,a))
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;; (#t `(cons* ,a ,d))))))
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;; (#t (cond ((memq (car d) '(list cons*))
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;; `(,(car d) ,a ,@(cdr d)))
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;; (#t `(cons* ,a ,d))))))
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;; (#t `(cons* ,a ,d))))
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((lambda (a d)
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;;(display "LAMBDA AD") (newline)
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(cond ((pair? d)
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(cond ((eq? (car d) 'quote)
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(cond (;;(and (pair? a) (eq? (car a) 'quote))
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(cond ((pair? a) (eq? (car a) 'quote))
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(#t #f))
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(list 'quote (cons (cadr a) (cadr d))))
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(#t (cond ((null? (cadr d))
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(list 'list a))
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(#t (list 'cons* a d))))))
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(#t (cond ((memq (car d) '(list cons*))
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;;`(,(car d) ,a ,@(cdr d))
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(cons (car d) (cons a (cdr d)))
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)
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;;(#t `(cons* ,a ,d))
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(#t (list 'cons* a d))
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))))
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;;(#t `(cons* ,a ,d))
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(#t (list 'cons* a d))
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))
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(loop (car x))
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(loop (cdr x)))
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)))
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(loop x))
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