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;;; Haunt --- Static site generator for GNU Guile
;;; Copyright © 2015 David Thompson <davet@gnu.org>
;;; Copyright 2005, 2006 Ludovic Courtès <ludovic.courtes@laas.fr>
;;;
;;; This file is part of Haunt.
;;;
;;; Haunt 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.
;;;
;;; Haunt 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 Haunt. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; Skribe reader.
;; Much code taken from the excellent Skribilo project.
;;
;;; Code:
(define-module (haunt skribe)
#:use-module ((system reader) #:renamer (symbol-prefix-proc 'r:))
#:export (%skribe-reader))
;; Taken from Skribilo
(define (make-colon-free-token-reader tr)
;; Stolen from `guile-reader' 0.3.
"If token reader @var{tr} handles the @code{:} (colon) character, remove it
from its specification and return the new token reader."
(let* ((spec (r:token-reader-specification tr))
(proc (r:token-reader-procedure tr)))
(r:make-token-reader (filter (lambda (chr)
(not (char=? chr #\:)))
spec)
proc)))
(define &sharp-reader
;; The reader for what comes after a `#' character.
(let* ((dsssl-keyword-reader ;; keywords à la `#!key'
(r:make-token-reader #\!
(r:token-reader-procedure
(r:standard-token-reader 'keyword)))))
(r:make-reader (cons dsssl-keyword-reader
(map r:standard-token-reader
'(character srfi-4 vector
number+radix boolean
srfi30-block-comment
srfi62-sexp-comment)))
#f ;; use default fault handler
'reader/record-positions)))
(define (make-skribe-reader)
(let ((colon-keywords ;; keywords à la `:key' fashion
(r:make-token-reader #\:
(r:token-reader-procedure
(r:standard-token-reader 'keyword))))
(symbol-misc-chars-tr
;; Make sure `:' is handled only by the keyword token reader.
(make-colon-free-token-reader
(r:standard-token-reader 'r6rs-symbol-misc-chars))))
;; Note: we use the `r6rs-symbol-*' and `r6rs-number' token readers since
;; they consider square brackets as delimiters.
(r:make-reader (cons* (r:make-token-reader #\# &sharp-reader)
colon-keywords
symbol-misc-chars-tr
(map r:standard-token-reader
`(whitespace
sexp string r6rs-number
r6rs-symbol-lower-case
r6rs-symbol-upper-case
quote-quasiquote-unquote
semicolon-comment
skribe-exp)))
#f ;; use the default fault handler
'reader/record-positions)))
(define %skribe-reader (make-skribe-reader))
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