55 lines
1.9 KiB
Scheme
55 lines
1.9 KiB
Scheme
;; -*-scheme-*-
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;;; GNU Mes --- Maxwell Equations of Software
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;;; Copyright © 2016 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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;;; syntax.mes is loaded after scm.mes. It provides the R5RS hygienic
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;;; macros define-syntax, syntax-rules and define-syntax-rule.
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;;; syntax-rules is adapted from scheme48-1.1/scheme/alt/syntax.scm
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;;; Code:
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(mes-use-module (mes scm))
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(include-from-path "mes/syntax.scm")
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(define (syntax-error message thing)
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(display "syntax-error:" (current-error-port))
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(display message (current-error-port))
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(display ":" (current-error-port))
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(display thing (current-error-port))
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(newline (current-error-port)))
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(define (silent-syntax-error message thing)
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*unspecified*)
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(define-macro (define-syntax-rule id-pattern . template)
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`(define-syntax ,(car id-pattern)
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(syntax-rules ()
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((,(car id-pattern) . ,(cdr id-pattern)) ,@template))))
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(define-macro (let-syntax bindings . rest)
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`((lambda ()
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,@(map (lambda (binding)
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`(define-macro (,(car binding) . args)
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(,(cadr binding) (cons ',(car binding) args)
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(lambda (x0) x0)
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eq?)))
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bindings)
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,@rest)))
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