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;;; srt2vtt --- SRT to WebVTT converter
;;; Copyright © 2015 David Thompson <davet@gnu.org>
;;;
;;; srt2vtt 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.
;;;
;;; srt2vtt 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 srt2vtt. If not, see <http://www.gnu.org/licenses/>.
(define-module (srt2vtt subrip)
#:use-module (ice-9 match)
#:use-module (ice-9 rdelim)
#:use-module (ice-9 regex)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-11)
#:use-module (srfi srfi-26)
#:use-module (srt2vtt)
#:export (read-subrip
read-subrips))
(define parse-time
(let ((regexp (make-regexp "^([0-9]+):([0-9]+):([0-9]+),([0-9]+)$")))
(lambda (s)
"Parse the SubRip formatted timestamp in the string S into a 4
element list. Valid input looks like '00:00:03.417'."
(let ((match (regexp-exec regexp s)))
(if match
(map (compose string->number (cut match:substring match <>))
'(1 2 3 4))
(error "Invalid SubRip timestamp: " s))))))
(define parse-time-span
(let ((regexp (make-regexp "^([0-9:,]+) --> ([0-9:,]+)$")))
(lambda (s)
"Parse the SubRip formatted time span in the string S and return
two values: the start time and the end time. Valid input looks like
'00:00:03.417 --> 00:00:04.936'."
(let ((match (regexp-exec regexp s)))
(if match
(values (parse-time (match:substring match 1))
(parse-time (match:substring match 2)))
(error "Invalid SubRip time range: " s))))))
(define (read-subrip port)
"Read a SubRip formatted subtitle from PORT."
(let-values (((id) (string->number (read-line port)))
((start end) (parse-time-span (read-line port)))
((lines) (let loop ((lines '()))
(let ((line (read-line port)))
(if (or (eof-object? line)
(and (string-null? line)
;; A subtitle may be a blank line!
(not (null? lines))))
(reverse lines)
(loop (cons line lines)))))))
(make-subtitle id start end lines)))
(define (read-subrips port)
"Read all SubRip formatted subtitles from PORT."
(reverse
(let loop ((subs '()))
(if (eof-object? (peek-char port))
subs
(loop (cons (read-subrip port) subs))))))
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