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;;; html-php.el --- multi-mode PHP embedded in HTML
;; Copyright (C) 2008 Dave Love
;; Author: Dave Love <fx@gnu.org>
;; Keywords: languages
;; $Revision: 2$
;; URL: http://www.loveshack.ukfsn.org/emacs
;; This file 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 2, or (at your option)
;; any later version.
;; This file 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 GNU Emacs; see the file COPYING. If not, write to
;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Commentary:
;; Multiple-mode editing of PHP embedded in HTML. Subject to the
;; limitations of multi-mode.el. Note that there's no attempt to deal
;; with commented processing instructions markup. Note also that this
;; only works properly with the basic HTML mode -- not PSGML or NXML.
;; Tested with the PHP mode from the hacked CC mode at the above URL.
;;; Code:
(require 'multi-mode)
(defun html-php-mode ()
"Mode for editing PHP embedded in HTML, using multi-mode."
(interactive)
(set (make-local-variable 'multi-alist)
'((html-mode)
(php-mode . html-php-chunk-region)))
(multi-mode-install-modes))
(defun html-php-chunk-region (pos)
"Mode-selecting function for PHP embedded in HTML.
See `multi-alist'."
(let ((case-fold-search t)
pi-start pi-end next-pi)
(save-excursion
(save-restriction
(widen)
(goto-char pos)
(save-excursion
(let* ((p1 (save-excursion
;; Check whether we're on the processing
;; instruction start. Skip definitely clear of
;; it and then search backwards.
(goto-char (min (point-max) (+ (point) 5)))
(search-backward "<?php" (- (point) 9) t)))
(match-end (if p1 (match-end 0)))
;; Otherwise search backwards simply.
(p2 (unless p1 (search-backward "<?php" nil t))))
(if p2 (setq match-end (match-end 0)))
(setq pi-start (or p1 p2))
;; Ready to search for matching terminator or next
;; processing instruction.
(goto-char (or match-end pos)))
(if pi-start
;; Look forward for the PI terminator.
(let* ((p1 (save-excursion
;; Check whether we're on the terminator.
(backward-char 1)
(search-backward "?>" (- (point) 2) t)))
(p2 (unless p1 (search-forward "?>" nil t))))
(setq pi-end (or p1 p2 (point-max))))
(goto-char pos))
(if (and pi-start pi-end (< pos pi-end))
;; We were between PI start and terminator.
(list 'php-mode pi-start pi-end)
;; Otherwise, look forward for a PI to delimit the HTML
;; region.
(setq next-pi (if (search-forward "<?php" nil t)
(match-beginning 0)
(point-max)))
(if pi-start
(list 'html-mode (or pi-end (point-min)) next-pi)
(list 'html-mode (point-min) next-pi))))))))
(provide 'html-php)
;;; html-php.el ends here
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