mes/module/mes/base-0.mes

;;; -*-scheme-*-

;;; Mes --- Maxwell Equations of Software
;;; Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
;;;
;;; 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/>.

;;; Commentary:

;;; base-0.mes is the first file being loaded from the Mes core.  It
;;; provides primitives that use Mes internals to create the illusion
;;; of compatibility with Guile.  It is not safe to be run by Guile.

;;; Code:

#f ;; FIXME -- needed for --dump, then --load

(define (primitive-eval e) (eval-env e (current-module)))
(define eval eval-env)
(define (expand-macro e) (expand-macro-env e (current-module)))

(define quotient /)

(define-macro (defined? x)
  (list 'assq x '(cddr (current-module))))

(if (defined? 'current-input-port) #t
    (define (current-input-port) 0))

(define (current-output-port) 1)
(define (current-error-port) 2)
(define (port-filename port) "<stdin>")
(define (port-line port) 0)
(define (port-column port) 0)
(define (ftell port) 0)
(define (false-if-exception x) x)

(define (cons* x . rest)
  (define (loop rest)
    (if (null? (cdr rest)) (car rest)
        (cons (car rest) (loop (cdr rest)))))
  (loop (cons x rest)))

(define (apply f h . t) (apply-env f (cons h t) (current-module)))
(define (apply f h . t)
  (if (null? t) (apply-env f h (current-module))
      (apply f (apply cons* (cons h t)))))

(define-macro (cond . clauses)
  (list 'if (null? clauses) *unspecified*
        (if (null? (cdr clauses))
           (list 'if (car (car clauses))
                 (list (cons 'lambda (cons '() (cons (car (car clauses)) (cdr (car clauses))))))
                 *unspecified*)
           (if (eq? (car (cadr clauses)) 'else)
               (list 'if (car (car clauses))
                   (list (cons 'lambda (cons '() (car clauses))))
                   (list (cons 'lambda (cons '() (cons *unspecified* (cdr (cadr clauses)))))))
               (list 'if (car (car clauses))
                   (list (cons 'lambda (cons '() (car clauses))))
                   (cons 'cond (cdr clauses)))))))

(define else #t)

(define (map f l . r)
  (if (null? l) '()
      (if (null? r) (cons (f (car l)) (map f (cdr l)))
          (if (null? (cdr r))
              (cons (f (car l) (caar r)) (map f (cdr l) (cdar r)))))))

(define-macro (simple-let bindings . rest)
  (cons (cons 'lambda (cons (map car bindings) rest))
        (map cadr bindings)))

(define-macro (let bindings . rest)
  (cons 'simple-let (cons bindings rest)))

(define *input-ports* '())
(define-macro (push! stack o)
  (cons
   'begin
   (list
    (list 'set! stack (list cons o stack))
    stack)))
(define-macro (pop! stack)
  (list 'let (list (list 'o (list car stack)))
        (list 'set! stack (list cdr stack))
        'o))
(define-macro (load file)
  (list 'begin
     (list 'push! '*input-ports* (list current-input-port))
     (list 'set-current-input-port (list open-input-file file))
     (list 'primitive-load)
     (list 'set-current-input-port (list 'pop! '*input-ports*))))
(define (memq x lst)
  (if (null? lst) #f
      (if (eq? x (car lst)) lst
          (memq x (cdr lst)))))

(define (string-join lst infix)
  (if (null? (cdr lst)) (car lst)
      (string-append (car lst) infix (string-join (cdr lst) infix))))

(define *mes-prefix* "module/")
(define (module->file o)
  (string-append (string-join (map symbol->string o) "/") ".mes"))

(define *modules* '(mes/base-0.mes))
(define (mes-load-module-env module a)
  (push! *input-ports* (current-input-port))
  (set-current-input-port (open-input-file (string-append *mes-prefix* (module->file module))))
  (let ((x (eval-env (append (cons 'begin (read-input-file-env #f a))
                             '((current-module)))
                     a)))
    (set-current-input-port (pop! *input-ports*))
    x))
(define (not x)
  (if x #f #t))
(define-macro (mes-use-module module)
  (list
   'begin
   (list 'if (list 'not (list 'memq (list string->symbol (module->file module)) '*modules*))
         (list
          'begin
          (list 'set! '*modules* (list cons (list string->symbol (module->file module)) '*modules*))
          ;; (list display "loading file=" (list current-error-port))
          ;; (list display (module->file module) (list current-error-port))
          ;; (list newline (list current-error-port))
          (list 'load (list string-append '*mes-prefix* (module->file module)))))))

(mes-use-module (srfi srfi-0))
(mes-use-module (mes base))
(mes-use-module (mes scm))