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;;; syntax.scm -- Syntactic candy for Skribilo modules. -*- coding: utf-8 -*-
;;;
;;; Copyright 2005, 2006, 2007, 2008, 2009, 2010, 2011,
;;; 2012, 2016, 2018 Ludovic Courtès <ludo@gnu.org>
;;;
;;;
;;; This file is part of Skribilo.
;;;
;;; Skribilo 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.
;;;
;;; Skribilo 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 Skribilo. If not, see <http://www.gnu.org/licenses/>.
(define-module (skribilo utils syntax)
#:use-module (system reader library)
#:use-module (system reader compat) ;; make sure `current-reader' exists
#:use-module (system reader confinement)
#:export (%skribilo-module-reader
skribilo-module-syntax
set-correct-file-encoding!
default-to-utf-8
%skribilo-text-domain
G_ N_
unwind-protect))
;;; Author: Ludovic Courtès
;;;
;;; 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)
"")
(G_ "unexpected character in Skribilo module"))
chr)))
(cond-expand
(guile-2 '(reader/record-positions))
(else
;; On Guile 1.8, don't record positions by default: this yields a
;; nice read performance improvement.
(if (memq 'positions (debug-options))
(list 'reader/record-positions)
'())))))
(define-macro (skribilo-module-syntax)
"Install the syntax reader for Skribilo modules."
(fluid-set! current-reader %skribilo-module-reader)
#t)
(define-macro (unwind-protect expr1 expr2)
;; This is no completely correct.
`(dynamic-wind
(lambda () #f)
(lambda () ,expr1)
(lambda () ,expr2)))
(cond-expand
((not guile-2)
;; In Guile 2.x these macros are defined in the core.
(begin
(define-macro (unless condition . exprs)
`(if (not ,condition)
,(if (null? (cdr exprs))
(car exprs)
`(begin ,@exprs))))
(define-macro (when condition . exprs)
`(if ,condition
,(if (null? (cdr exprs))
(car exprs)
`(begin ,@exprs))))
(export when unless)))
(else (begin)))
(cond-expand
(guile-2
(define-syntax set-correct-file-encoding!
(syntax-rules ()
((_)
(set-correct-file-encoding! (current-input-port)))
((_ port)
;; Use the encoding specified by the `coding:' comment.
(let ((e (false-if-exception (file-encoding port))))
(and (string? e)
(set-port-encoding! port e))))))
(define-syntax default-to-utf-8
(syntax-rules ()
((_ body ...)
(with-fluids ((%default-port-encoding "UTF-8"))
body ...)))))
(else
(define-macro (set-correct-file-encoding! . p)
#f)
(define-macro (default-to-utf-8 . body)
`(begin ,@body))))
;;;
;;; Gettext support.
;;;
(define %skribilo-text-domain "skribilo")
(textdomain %skribilo-text-domain)
(define (G_ msg)
(gettext msg %skribilo-text-domain))
(define (N_ msg msgplural n)
(ngettext msg msgplural n %skribilo-text-domain))
;;; syntax.scm ends here
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