180 lines
5 KiB
Scheme
Executable file
180 lines
5 KiB
Scheme
Executable file
;;; -*-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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;;; scm.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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;; The Maxwell Equations of Software -- John McCarthy page 13
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;; http://www.softwarepreservation.org/projects/LISP/book/LISP%201.5%20Programmers%20Manual.pdf
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(define (list . rest) rest)
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(define-macro (begin . rest)
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`((lambda () ,@rest)))
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(define (equal? a b) ;; FIXME: only 2 arg
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(cond ((and (null? a) (null? b)) #t)
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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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(#t (eq? a b))))
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(define (vector . rest) (list->vector rest))
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(define (apply f args)
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(eval (cons f args) (current-module)))
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(define (defined? x)
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(assq x (current-module)))
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(define (procedure? p)
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(cond ((builtin? p) #t)
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((pair? p) (eq? (car p) 'lambda))
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(#t #f)))
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(define assv assq)
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(define (memq x lst)
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(cond ((null? lst) #f)
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((eq? x (car lst)) lst)
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(#t (memq x (cdr lst)))))
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(define memv memq)
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(define (member x lst)
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(cond ((null? lst) #f)
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((equal? x (car lst)) lst)
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(#t (member x (cdr lst)))))
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(define-macro (or2 x y)
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`(cond (,x ,x) (#t ,y)))
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(define-macro (and2 x y)
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`(cond (,x ,y) (#t #f)))
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(define-macro (or . x)
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(cond
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((null? x) #f)
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((null? (cdr x)) (car x))
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(#t `(cond (,(car x))
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(#t (or ,@(cdr x)))))))
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(define-macro (and . x)
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(cond ((null? x) #t)
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((null? (cdr x)) (car x))
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(#t `(cond (,(car x) (and ,@(cdr x)))
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(#t #f)))))
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(define (split-params bindings params)
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(cond ((null? bindings) params)
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(#t (split-params (cdr bindings)
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(append params (cons (caar bindings) '()))))))
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(define (split-values bindings values)
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(cond ((null? bindings) values)
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(#t (split-values (cdr bindings)
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(append values (cdar bindings) '())))))
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(define-macro (simple-let bindings rest)
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`((lambda ,(split-params bindings '()) ,@rest)
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,@(split-values bindings '())))
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(define-macro (let-loop label bindings rest)
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`(let ((,label *unspecified*))
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(let ((,label (lambda ,(split-params bindings '()) ,@rest)))
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(,label ,@(split-values bindings '())))))
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(define-macro (let bindings-or-label . rest)
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`(if ,(symbol? bindings-or-label)
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(let-loop ,bindings-or-label ,(car rest) ,(cdr rest))
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(simple-let ,bindings-or-label ,rest)))
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(define (expand-let* bindings body)
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(cond ((null? bindings)
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`((lambda () ,@body)))
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(#t `((lambda (,(caar bindings))
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,(expand-let* (cdr bindings) body))
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,@(cdar bindings)))))
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(define-macro (let* bindings . body)
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(expand-let* bindings body))
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(define (map f l . r)
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(cond ((null? l) '())
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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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(define (identity x) x)
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(define (for-each f l . r)
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(apply map (cons f (cons l r)))
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*unspecified*)
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(define (not x)
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(cond (x #f)
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(#t #t)))
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(define (<= a b) ;; FIXME: only 2 arg
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(or (< a b)
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(= a b)))
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(define (>= a b) ;; FIXME: only 2 arg
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(or (> a b)
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(= a b)))
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(define (list? x)
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(or (null? x)
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(and (pair? x) (list? (cdr x)))))
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(define-macro (if expr then . else)
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`(cond
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(,expr ,then)
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(#t (cond (,(pair? else) ((lambda () ,@else)))))))
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(define-macro (when expr . body)
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`(if ,expr
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((lambda () ,@body))))
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(define (unspecified-bindings bindings params)
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(cond ((null? bindings) params)
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(#t (unspecified-bindings
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(cdr bindings)
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(append params (cons (cons (caar bindings) '(*unspecified*)) '()))))))
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(define (letrec-setters bindings setters)
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(cond ((null? bindings) setters)
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(#t (letrec-setters (cdr bindings)
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(append setters
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(cons (cons 'set! (car bindings)) '()))))))
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(define-macro (letrec bindings . body)
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`(let ,(unspecified-bindings bindings '())
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,@(letrec-setters bindings '())
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,@body))
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;; TODO
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;; (define gensym
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;; (let ((counter 0))
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;; (lambda (. rest)
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;; (let ((val (number->string counter)))
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;; (set! counter (+ counter 1))
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;; (string->symbol (string-append "g" val))))))
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(define *gensym* 0)
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(define (gensym)
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(set! *gensym* (+ *gensym* 1))
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(string->symbol (string-append "g" (number->string *gensym*))))
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