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;; Copyright (C) 2015, 2016 Erik Edrosa <erik.edrosa@gmail.com>
;;
;; This file is part of guile-commonmark
;;
;; guile-commonmark is free software: you can redistribute it and/or
;; modify it under the terms of the GNU Lesser General Public License
;; as published by the Free Software Foundation, either version 3 of
;; the License, or (at your option) any later version.
;;
;; guile-commonmark 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 Lesser General Public License for more details.
;;
;; You should have received a copy of the GNU Lesser General Public License
;; along with guile-commonmark. If not, see <http://www.gnu.org/licenses/>.
(define-module (commonmark utils)
#:use-module (ice-9 rdelim)
#:export (filter-map&co
read-line-without-nul))
(define (filter-map&co f l k)
"like filter-map but uses a continuation to collect an extra list of values"
(if (null? l)
(k '() '())
(f (car l) (lambda (v d)
(filter-map&co f (cdr l)
(lambda (v2 d2)
(k (if v (cons v v2) v2) (append d d2))))))))
;; Line is one of:
;; - String
;; - eof-object
;; Port -> Line
(define (read-line-without-nul port)
"Return a line of text from PORT replacing '\0' with '\uFFFD' or
returns eof-object."
(define (replace-nul x)
(if (char=? x #\nul) #\xFFFD x))
(let ((line (read-line port)))
(cond ((eof-object? line) line)
((string-any #\nul line) (string-map replace-nul line))
(else line))))
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