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;;; syntax.scm -- Syntactic candy for Skribilo modules.
;;;
;;; Copyright 2005 Ludovic Court�s <ludovic.courtes@laas.fr>
;;;
;;;
;;; This program 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 2 of the License, or
;;; (at your option) any later version.
;;;
;;; This program 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 this program; if not, write to the Free Software
;;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
;;; USA.
(define-module (skribilo utils syntax)
:use-module (skribilo reader)
:use-module (system reader library)
:use-module (system reader compat) ;; make sure `current-reader' exists
:use-module (system reader confinement)
:export (%skribe-reader %skribilo-module-reader)
:export-syntax (unwind-protect unless when))
;;; Author: Ludovic Court�s
;;;
;;; Commentary:
;;;
;;; A reader for the Skribe syntax, i.e. roughly R5RS Scheme plus DSSSL-style
;;; keywords and sk-exps (expressions introduced using a square bracket).
;;;
;;; Code:
(define %skribilo-module-reader
;; The syntax used to read Skribilo modules.
(make-alternate-guile-reader '(colon-keywords
no-scsh-block-comments
srfi30-block-comments
srfi62-sexp-comments)
(lambda (chr port read)
(error "unexpected character in Skribilo module"
chr))
'reader/record-positions))
(define %skribe-reader
;; The Skribe syntax reader.
(make-reader 'skribe))
(define-macro (unwind-protect expr1 expr2)
;; This is no completely correct.
`(dynamic-wind
(lambda () #f)
(lambda () ,expr1)
(lambda () ,expr2)))
(define-macro (unless condition . exprs)
`(if (not ,condition) (begin ,@exprs)))
(define-macro (when condition . exprs)
`(if ,condition (begin ,@exprs)))
;;; arch-tag: 9a0e0638-64f0-480a-ab19-49e8bfcbcd9b
;;; syntax.scm ends here
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