module/language/scheme/spec.scm

   1 ;;; Guile Scheme specification
   2
   3 ;; Copyright (C) 2001, 2009 Free Software Foundation, Inc.
   4
   5 ;;;; This library is free software; you can redistribute it and/or
   6 ;;;; modify it under the terms of the GNU Lesser General Public
   7 ;;;; License as published by the Free Software Foundation; either
   8 ;;;; version 3 of the License, or (at your option) any later version.
   9 ;;;;
  10 ;;;; This library is distributed in the hope that it will be useful,
  11 ;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 ;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 ;;;; Lesser General Public License for more details.
  14 ;;;;
  15 ;;;; You should have received a copy of the GNU Lesser General Public
  16 ;;;; License along with this library; if not, write to the Free Software
  17 ;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  18
  19 ;;; Code:
  20
  21 (define-module (language scheme spec)
  22   #:use-module (system base compile)
  23   #:use-module (system base language)
  24   #:use-module (language scheme compile-tree-il)
  25   #:use-module (language scheme decompile-tree-il)
  26   #:export (scheme))
  27
  28 ;;;
  29 ;;; Reader
  30 ;;;
  31
  32 (read-enable 'positions)
  33
  34 ;;;
  35 ;;; Language definition
  36 ;;;
  37
  38 (define-language scheme
  39   #:title       "Guile Scheme"
  40   #:version     "0.5"
  41   #:reader      (lambda (port env)
  42                   ;; Use the binding of current-reader from the environment.
  43                   ;; FIXME: Handle `read-options' as well?
  44                   ((or (and=> (and=> (module-variable env 'current-reader)
  45                                      variable-ref)
  46                               fluid-ref)
  47                        read)
  48                    port))
  49
  50   #:compilers   `((tree-il . ,compile-tree-il))
  51   #:decompilers `((tree-il . ,decompile-tree-il))
  52   #:evaluator   (lambda (x module) (primitive-eval x))
  53   #:printer     write
  54   #:make-default-environment
  55                 (lambda ()
  56                   ;; Ideally we'd duplicate the whole module hierarchy so that `set!',
  57                   ;; `fluid-set!', etc. don't have any effect in the current environment.
  58                   (let ((m (make-fresh-user-module)))
  59                     ;; Provide a separate `current-reader' fluid so that
  60                     ;; compile-time changes to `current-reader' are
  61                     ;; limited to the current compilation unit.
  62                     (module-define! m 'current-reader (make-fluid))
  63                     m)))