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+;;;;
+;;;; html4.skr				-- HTML 4.01 Engine
+;;;; 
+;;;; Copyright © 2004 Erick Gallesio - I3S-CNRS/ESSI <eg@essi.fr>
+;;;; 
+;;;; 
+;;;; 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 
+;;;; USA.
+;;;; 
+;;;;           Author: Erick Gallesio [eg@essi.fr]
+;;;;    Creation date: 18-Feb-2004 11:58 (eg)
+;;;; Last file update: 26-Feb-2004 21:09 (eg)
+;;;;
+
+(define (find-children node)
+  (define (flat l)
+    (cond 
+      ((null? l) l)
+      ((pair? l) (append (flat (car l))
+			 (flat (cdr l))))
+      (else      (list l))))
+  
+  (if (markup? node) 
+      (flat (markup-body node))
+      node))
+
+;;; ======================================================================
+
+(let ((le (find-engine 'html)))
+  ;;----------------------------------------------------------------------
+  ;;	Customizations
+  ;;----------------------------------------------------------------------
+  (engine-custom-set! le 'html-variant    "html4")
+  (engine-custom-set! le 'html4-logo      "http://www.w3.org/Icons/valid-html401")
+  (engine-custom-set! le 'html4-validator "http://validator.w3.org/check/referer")
+  
+  ;;----------------------------------------------------------------------
+  ;; 	&html-html ...
+  ;;----------------------------------------------------------------------
+  (markup-writer '&html-html le
+     :before "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">
+<html>\n"
+     :after "</html>")
+
+  ;;----------------------------------------------------------------------
+  ;; 	&html-ending
+  ;;----------------------------------------------------------------------
+  (let* ((img (engine-custom le 'html4-logo))
+	 (url (engine-custom le 'html4-validator))
+	 (bottom (list (hrule) 
+		      (table :width 100.
+			 (tr
+			    (td :align 'left
+			       (font :size -1 [
+				 This ,(sc "Html") page has been produced by 
+				      ,(ref :url (skribe-url) :text "Skribe").
+				      ,(linebreak)
+				      Last update ,(it (date)).]))
+			    (td :align 'right :valign 'top
+			       (ref :url url 
+				  :text (image :url img :width 88 :height 31))))))))
+    (markup-writer '&html-ending le
+       :before "<div class=\"skribe-ending\">"
+       :action (lambda (n e)
+		 (let ((body (markup-body n)))
+		   (if body
+		       (output body #t)
+		       (skribe-eval bottom e))))
+       :after "</div>\n"))
+  
+  ;;----------------------------------------------------------------------
+  ;;	color ...
+  ;;----------------------------------------------------------------------
+  (markup-writer 'color le
+     :options '(:bg :fg :width :margin)
+     :before (lambda (n e) 
+	       (let ((m    (markup-option n :margin))
+		     (w    (markup-option n :width))
+		     (bg   (markup-option n :bg))
+		     (fg   (markup-option n :fg)))
+		 (when bg
+		   (display "<table cellspacing=\"0\"")
+		   (html-class n)
+		   (printf " cellpadding=\"~a\"" (if m m 0))
+		   (if w (printf " width=\"~a\"" (html-width w)))
+		   (display "><tbody>\n<tr>")
+		   (display "<td bgcolor=\"")
+		   (output bg e)
+		   (display "\">"))
+		 (when fg
+		   (display "<span style=\"color:")
+		   (output fg e)
+		   (display ";\">"))))
+     :after (lambda (n e)
+	      (when (markup-option n :fg)
+		(display "</span>"))
+	      (when (markup-option n :bg) 
+		(display "</td></tr>\n</tbody></table>"))))
+  
+  ;;----------------------------------------------------------------------
+  ;;	font ...
+  ;;----------------------------------------------------------------------
+  (markup-writer 'font le
+     :options '(:size :face)
+     :before (lambda (n e) 
+	       (let ((face (markup-option n :face))
+		     (size (let ((sz (markup-option n :size)))
+			     (cond
+			       ((or (unspecified? sz) (not sz))
+				#f)
+			       ((and (number? sz) (or (inexact? sz) (negative? sz)))
+				(format "~a%" 
+					(+ 100 
+					   (* 20 (inexact->exact (truncate sz))))))
+			       ((number? sz)
+				sz)
+			       (else 
+				(skribe-error 'font
+					      (format "Illegal font size ~s" sz)
+					      n))))))
+		 (display "<span ")
+		 (html-class n)
+		 (display "style=\"")
+		 (if size (printf "font-size: ~a; " size))
+		 (if face (printf "font-family:'~a'; " face))
+		 (display "\">")))
+     :after "</span>")
+
+  ;;----------------------------------------------------------------------
+  ;;	paragraph ...
+  ;;----------------------------------------------------------------------
+  (copy-markup-writer 'paragraph le
+     :validate (lambda (n e)
+		 (let ((pred (lambda (x)
+			       (and (container? x)
+				    (not (memq (markup-markup x) '(font color)))))))
+		   (not (any pred (find-children n))))))
+
+  ;;----------------------------------------------------------------------
+  ;;	roman ...
+  ;;----------------------------------------------------------------------
+  (markup-writer 'roman le
+     :before "<span style=\"font-family: serif\">"
+     :after "</span>") 
+  
+  ;;----------------------------------------------------------------------
+  ;;	table ...
+  ;;----------------------------------------------------------------------
+  (let ((old-writer (markup-writer-get 'table le)))
+    (copy-markup-writer 'table le
+	:validate (lambda (n e)
+		    (not (null? (markup-body n))))))
+)