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+;;; -*-Scheme-*-
+;;;
+;;; $Id: htmlmode.scm,v 1.1 1999/10/07 17:00:07 cph Exp $
+;;;
+;;; Copyright (c) 1999 Massachusetts Institute of Technology
+;;;
+;;; This program 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 of the
+;;; License, or (at your option) any later version.
+;;;
+;;; This program 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 this program; if not, write to the Free Software
+;;; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+;;;; Major Mode for HTML
+
+(declare (usual-integrations))
+\f
+(define-major-mode html text "HTML"
+  "Major mode for editing HTML."
+  (lambda (buffer)
+    (local-set-variable! syntax-table html-syntax-table buffer)
+    (local-set-variable! indent-line-procedure
+                        (ref-command indent-relative)
+                        buffer)
+    (local-set-variable! paragraph-separate html-paragraph-separator buffer)
+    (local-set-variable! paragraph-start html-paragraph-separator buffer)
+    (local-set-variable! syntax-ignore-comments-backwards #f buffer)
+    (local-set-variable! comment-locator-hook html-comment-locate buffer)
+    (local-set-variable! comment-indent-hook html-comment-indentation buffer)
+    (local-set-variable! comment-start "<!-- " buffer)
+    (local-set-variable! comment-end " -->" buffer)
+    (local-set-variable!
+     sentence-end
+     "[.?!][]\"')}]*\\(<[^>]*>\\)*\\($\\| $\\|\t\\|  \\)[ \t\n]*"
+     buffer)
+    (event-distributor/invoke! (ref-variable html-mode-hook buffer) buffer)))
+
+(define html-paragraph-separator
+  "^[ \t]*$\\|^[ \t]*</?\\([A-Za-z]\\([-.A-Za-z0-9= \t\n]\\|\"[^\"]*\"\\|'[^']*'\\)*\\)?>$")
+
+(define-command html-mode
+  "Enter HTML mode."
+  ()
+  (lambda () (set-current-major-mode! (ref-mode-object html))))
+
+(define-variable html-mode-hook
+  "An event distributor that is invoked when entering HTML mode."
+  (make-event-distributor))
+
+(define html-syntax-table
+  (let ((syntax-table (make-syntax-table text-mode:syntax-table)))
+    (modify-syntax-entry! syntax-table #\< "(>1")
+    (modify-syntax-entry! syntax-table #\! ". 2")
+    (modify-syntax-entry! syntax-table #\- "_ 3")
+    (modify-syntax-entry! syntax-table #\> ")<4")
+    (modify-syntax-entry! syntax-table #\" "\"\"")
+    syntax-table))
+
+(define (html-comment-locate mark)
+  (and (re-search-forward "<!--+[ \t]*" (line-start mark 0) (line-end mark 0))
+       (cons (re-match-start 0) (re-match-end 0))))
+
+(define (html-comment-indentation mark)
+  mark
+  0)