module/language/tree-il/spec.scm

   1 ;;; Tree Intermediate Language
   2
   3 ;; Copyright (C) 2009, 2010, 2011 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 tree-il spec)
  22   #:use-module (system base language)
  23   #:use-module (system base pmatch)
  24   #:use-module (language glil)
  25   #:use-module (language tree-il)
  26   #:use-module (language tree-il compile-glil)
  27   #:export (tree-il))
  28
  29 (define (write-tree-il exp . port)
  30   (apply write (unparse-tree-il exp) port))
  31
  32 (define (join exps env)
  33   (pmatch exps
  34     (() (make-void #f))
  35     ((,x) x)
  36     ((,x . ,rest)
  37      (make-seq #f x (join rest env)))
  38     (else (error "what!" exps env))))
  39
  40 (define-language tree-il
  41   #:title       "Tree Intermediate Language"
  42   #:reader      (lambda (port env) (read port))
  43   #:printer     write-tree-il
  44   #:parser      parse-tree-il
  45   #:joiner      join
  46   #:compilers   `((glil . ,compile-glil))
  47   )