105 lines
3.4 KiB
Scheme
105 lines
3.4 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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;;; base-0.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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;;; Commentary:
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;;; base-0.mes is the first file being loaded from the Mes core. It
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;;; provides primitives that use Mes internals to create the illusion
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;;; of compatibility with Guile. It is not safe to be run by Guile.
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;;; Code:
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(define (primitive-eval e) (eval-env e (current-module)))
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(define eval eval-env)
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(define (expand-macro e) (expand-macro-env e (current-module)))
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(define quotient /)
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(define-macro (defined? x)
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(list 'assq x '(cddr (current-module))))
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(if (defined? 'current-input-port) #t
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(define (current-input-port) 0))
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(define (current-output-port) 1)
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(define (current-error-port) 2)
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(define (port-filename port) "<stdin>")
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(define (port-line port) 0)
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(define (port-column port) 0)
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(define (ftell port) 0)
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(define (false-if-exception x) x)
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(define (cons* x . rest)
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(define (loop rest)
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(if (null? (cdr rest)) (car rest)
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(cons (car rest) (loop (cdr rest)))))
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(loop (cons x rest)))
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(define (apply f h . t) (apply-env f (cons h t) (current-module)))
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(define (apply f h . t)
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(if (null? t) (apply-env f h (current-module))
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(apply f (apply cons* (cons h t)))))
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(define-macro (cond . clauses)
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(list 'if (null? clauses) *unspecified*
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(if (null? (cdr clauses))
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(list 'if (car (car clauses))
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(list (cons 'lambda (cons '() (cons (car (car clauses)) (cdr (car clauses))))))
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*unspecified*)
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(if (eq? (car (cadr clauses)) 'else)
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(list 'if (car (car clauses))
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(list (cons 'lambda (cons '() (car clauses))))
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(list (cons 'lambda (cons '() (cons *unspecified* (cdr (cadr clauses)))))))
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(list 'if (car (car clauses))
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(list (cons 'lambda (cons '() (car clauses))))
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(cons 'cond (cdr clauses)))))))
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(define else #t)
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(define (map f l . r)
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(if (null? l) '()
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(if (null? r) (cons (f (car l)) (map f (cdr l)))
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(if (null? (cdr r))
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(cons (f (car l) (caar r)) (map f (cdr l) (cdar r)))))))
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(define-macro (simple-let bindings . rest)
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(cons (cons 'lambda (cons (map car bindings) rest))
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(map cadr bindings)))
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(define-macro (let bindings . rest)
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(cons 'simple-let (cons bindings rest)))
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(define *input-ports* '())
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(define-macro (push! stack o)
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`(begin
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(set! ,stack (cons ,o ,stack))
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,stack))
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(define-macro (pop! stack)
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`(let ((o (car ,stack)))
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(set! ,stack (cdr ,stack))
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o))
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(define-macro (load file)
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`(primitive-eval
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(begin
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(push! *input-ports* (current-input-port))
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(set-current-input-port (open-input-file ,file))
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(primitive-load)
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(set-current-input-port (pop! *input-ports*)))))
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