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;;; syntax.scm -- Syntactic candy for Skribilo modules.
;;;
;;; Copyright 2005, 2006 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
;;; 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:
;;;
;;; This module provides syntactic candy for Skribilo modules, i.e., a syntax
;;; similar to Guile's default syntax with a few extensions, plus various
;;; convenience macros.
;;;
;;; Code:
(define %skribilo-module-reader
;; The syntax used to read Skribilo modules.
(apply make-alternate-guile-reader
'(colon-keywords no-scsh-block-comments
srfi30-block-comments srfi62-sexp-comments)
(lambda (chr port read)
(let ((file (port-filename port))
(line (port-line port))
(column (port-column port)))
(error (string-append
(if (string? file)
(format #f "~a:~a:~a: " file line column)
"")
"unexpected character in Skribilo module")
chr)))
;; By default, don't record positions: this yields a nice read
;; performance improvement.
(if (memq 'debug (debug-options))
(list '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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