83 lines
2.4 KiB
Scheme
83 lines
2.4 KiB
Scheme
;;; -*-scheme-*-
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;;; GNU Mes --- Maxwell Equations of Software
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;;; Copyright © 2016,2018 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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;;; Commentary:
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;;; Code:
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(mes-use-module (mes scm))
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(define-macro (make-fluid . default)
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((lambda (fluid)
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`(begin
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(module-define!
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(boot-module)
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',fluid
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((lambda (v)
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(lambda ( . rest)
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(if (null? rest) v
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(set! v (car rest)))))
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,(and (pair? default) (car default))))
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',fluid))
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(symbol-append 'fluid: (gensym))))
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(define (fluid-ref fluid)
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(fluid))
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(define (fluid-set! fluid value)
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(fluid value))
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(define-macro (fluid? fluid)
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`(begin
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(and (symbol? ,fluid)
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(symbol-prefix? 'fluid: ,fluid))))
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(define (with-fluid* fluid value thunk)
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(let ((v (fluid)))
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(fluid-set! fluid value)
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(let ((r (thunk)))
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(fluid-set! fluid v)
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r)))
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;; (define-macro (with-fluids*-macro fluids values thunk)
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;; `(begin
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;; ,@(map (lambda (f v) (list 'set! f v)) fluids values)
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;; (,thunk)))
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;; (define (with-fluids*-next fluids values thunk)
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;; `(with-fluids*-macro ,fluids ,values ,thunk))
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;; (define (with-fluids* fluids values thunk)
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;; (primitive-eval (with-fluids*-next fluids values thunk)))
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(define-macro (with-fluids bindings . bodies)
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(let ((syms (map gensym bindings)))
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`(let ,(map (lambda (b s) `(,s (,b))) (map car bindings) syms)
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,@(map (lambda (o) `(fluid-set! ,(car o) ,(cadr o))) bindings)
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(let ((r (begin ,@bodies)))
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,@(map (lambda (b s) `(fluid-set! ,b ,s)) (map car bindings) syms)
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r))))
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(define (dynamic-wind in-guard thunk out-guard)
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(in-guard)
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(let ((r (thunk)))
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(out-guard)
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r))
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