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;;; xml.scm -- XML syntax highlighting.
;;;
;;; Copyright 2005, 2007 Ludovic Court�s <ludovic.courtes@laas.fr>
;;;
;;;
;;; 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 source xml)
:export (xml)
:use-module (skribilo lib)
:use-module (ice-9 regex))
(define %comment-rx (make-regexp "<!--(.|\\n)*-->" regexp/extended))
(define (xml-fontifier str)
(let loop ((start 0)
(result '()))
(if (>= start (string-length str))
(reverse! result)
(case (string-ref str start)
((#\")
(let ((end (string-index str start #\")))
(if (not end)
(skribe-error 'xml-fontifier
"unterminated XML string"
(string-drop str start))
(loop end
(cons (new markup
(markup '&source-string)
(body (substring str start end)))
result)))))
((#\<)
(let ((end (string-index str #\> start)))
(if (not end)
(skribe-error 'xml-fontifier
"unterminated XML tag"
(string-drop str start))
(let ((comment? (regexp-exec %comment-rx
(substring str start end))))
(loop end
(cons (if comment?
(new markup
(markup '&source-comment)
(body (substring str start end)))
(new markup
(markup '&source-module)
(body (substring str start end))))
result))))))
(else
(loop (+ 1 start)
(if (or (null? result)
(not (string? (car result))))
(cons (string (string-ref str start)) result)
(cons (string-append (car result)
(string (string-ref str start)))
(cdr result)))))))))
(define xml
(new language
(name "xml")
(fontifier xml-fontifier)
(extractor #f)))
;;; xml.scm ends here
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