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;;; html4.scm -- HTML 4.01 engine.
;;; -*- coding: iso-8859-1 -*-
;;;
;;; Copyright 2004 Erick Gallesio - I3S-CNRS/ESSI <eg@essi.fr>
;;; Copyright 2007 Ludovic Court�s <ludo@chbouib.org>
;;;
;;;
;;; 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 engine html4)
:use-module (skribilo ast)
:use-module (skribilo config)
:use-module (skribilo engine)
:use-module (skribilo writer)
:use-module (skribilo utils syntax)
:use-module (skribilo package base)
:use-module (skribilo engine html)
:autoload (skribilo evaluator) (evaluate-document)
:autoload (skribilo output) (output)
:autoload (skribilo lib) (skribe-error)
:use-module (srfi srfi-1)
:use-module ((srfi srfi-19) :renamer (symbol-prefix-proc 's19:)))
(skribilo-module-syntax)
(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 HTML page was produced by "
(ref :url (skribilo-url)
:text "Skribilo") ". "
(linebreak)
"Last update: "
(s19:date->string
(s19:current-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)
(evaluate-document 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)
(format #t " cellpadding=\"~a\"" (if m m 0))
(if w (format #t " 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 #f "~a%"
(+ 100
(* 20 (inexact->exact (truncate sz))))))
((number? sz)
sz)
(else
(skribe-error 'font
(format #f
"invalid font size ~s" sz)
n))))))
(display "<span ")
(html-class n)
(display "style=\"")
(if size (format #t "font-size: ~a; " size))
(if face (format #t "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 ...
;;----------------------------------------------------------------------
(copy-markup-writer 'table le
:validate (lambda (n e)
(not (null? (markup-body n)))))
)
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