101 lines
3.4 KiB
Scheme
101 lines
3.4 KiB
Scheme
;;; -*-scheme-*-
|
|
|
|
;;; Mes --- Maxwell Equations of Software
|
|
;;; Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
|
|
;;;
|
|
;;; test.mes: This file is part of Mes.
|
|
;;;
|
|
;;; 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.
|
|
;;;
|
|
;;; 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 Mes. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
(define-macro (simple-let bindings . rest)
|
|
`(,`(lambda ,(map car bindings) ,@rest)
|
|
,@(map cadr bindings)))
|
|
|
|
(define-macro (named-let label bindings . rest)
|
|
`(simple-let ((,label *unspecified*))
|
|
(set! ,label (lambda ,(map car bindings) ,@rest))
|
|
(,label ,@(map cadr bindings))))
|
|
|
|
(define-macro (combined-let bindings-or-label . rest)
|
|
(display
|
|
`(,`(cond
|
|
(,(symbol? bindings-or-label)
|
|
(lambda () ,(cons* 'named-let bindings-or-label `(car ,rest) `(cdr ,rest))))
|
|
(#t
|
|
(lambda () ,(cons* 'simple-let bindings-or-label rest))
|
|
))))
|
|
(newline)
|
|
`(,`(cond
|
|
(,(symbol? bindings-or-label)
|
|
(lambda () ,(cons* 'named-let bindings-or-label `(car ,rest) `(cdr ,rest))))
|
|
(#t
|
|
(lambda () ,(cons* 'simple-let bindings-or-label rest))
|
|
))))
|
|
|
|
|
|
|
|
|
|
(define (split-params bindings params)
|
|
(cond ((null? bindings) params)
|
|
(#t (split-params (cdr bindings)
|
|
(append params (cons (caar bindings) '()))))))
|
|
|
|
(define (split-values bindings values)
|
|
(cond ((null? bindings) values)
|
|
(#t (split-values (cdr bindings)
|
|
(append values (cdar bindings) '())))))
|
|
|
|
(define-macro (xsimple-let bindings rest)
|
|
`((lambda ,(split-params bindings '()) ,@rest)
|
|
,@(split-values bindings '())))
|
|
|
|
(define-macro (xnamed-let label bindings rest)
|
|
`((lambda (,label)
|
|
(set! ,label (lambda ,(split-params bindings '()) ,@rest))
|
|
(,label ,@(split-values bindings '())))
|
|
*unspecified*))
|
|
|
|
(define-macro (let bindings-or-label . rest)
|
|
`(cond (,(symbol? bindings-or-label)
|
|
(xnamed-let ,bindings-or-label ,(car rest) ,(cdr rest)))
|
|
(#t (xsimple-let ,bindings-or-label ,rest))))
|
|
|
|
(define (expand-let* bindings body)
|
|
(cond ((null? bindings)
|
|
`((lambda () ,@body)))
|
|
(#t `((lambda (,(caar bindings))
|
|
,(expand-let* (cdr bindings) body))
|
|
,@(cdar bindings)))))
|
|
|
|
(define-macro (let* bindings . body)
|
|
(expand-let* bindings body))
|
|
|
|
(define (unspecified-bindings bindings params)
|
|
(cond ((null? bindings) params)
|
|
(#t (unspecified-bindings
|
|
(cdr bindings)
|
|
(append params (cons (cons (caar bindings) '(*unspecified*)) '()))))))
|
|
|
|
(define (letrec-setters bindings setters)
|
|
(cond ((null? bindings) setters)
|
|
(#t (letrec-setters (cdr bindings)
|
|
(append setters
|
|
(cons (cons 'set! (car bindings)) '()))))))
|
|
|
|
(define-macro (letrec bindings . body)
|
|
`(let ,(unspecified-bindings bindings '())
|
|
,@(letrec-setters bindings '())
|
|
,@body))
|
|
|