What's required to include sxml->html inside guile?
;;; Copyright © 2015 David Thompson <da...@gnu.org>
;;; Copyright © 2016-2017 Amirouche Boubekki <amirou...@hypermove.net>
;;;
;;; 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 3 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, see <http://www.gnu.org/licenses/>.
;; ChangeLog:
;;
;; - 2017-XX-XX: add support for script tags
;;
(define-module (web html))
(use-modules (ice-9 rdelim))
(use-modules (sxml simple))
(use-modules (srfi srfi-26))
(use-modules (ice-9 match))
(use-modules (ice-9 format))
(use-modules (ice-9 hash-table))
(use-modules (srfi srfi-1))
(use-modules (web uri))
(use-modules ((sxml xpath) #:renamer (symbol-prefix-proc 'sxml:)))
;;;
;;; sxml->html
;;;
(define %void-elements
'(area
base
br
col
command
embed
hr
img
input
keygen
link
meta
param
source
track
wbr))
(define (void-element? tag)
"Return #t if TAG is a void element."
(pair? (memq tag %void-elements)))
(define %escape-chars
(alist->hash-table
'((#\" . "quot")
(#\& . "amp")
(#\' . "apos")
(#\< . "lt")
(#\> . "gt"))))
(define (string->escaped-html s port)
"Write the HTML escaped form of S to PORT."
(define (escape c)
(let ((escaped (hash-ref %escape-chars c)))
(if escaped
(format port "&~a;" escaped)
(display c port))))
(string-for-each escape s))
(define (object->escaped-html obj port)
"Write the HTML escaped form of OBJ to PORT."
(string->escaped-html
(call-with-output-string (cut display obj <>))
port))
(define (attribute-value->html value port)
"Write the HTML escaped form of VALUE to PORT."
(if (string? value)
(string->escaped-html value port)
(object->escaped-html value port)))
(define (attribute->html attr value port)
"Write ATTR and VALUE to PORT."
(format port "~a=\"" attr)
(attribute-value->html value port)
(display #\" port))
(define (element->html tag attrs body port)
"Write the HTML TAG to PORT, where TAG has the attributes in the
list ATTRS and the child nodes in BODY."
(format port "<~a" tag)
(for-each (match-lambda
((attr value)
(display #\space port)
(attribute->html attr value port)))
attrs)
(cond
((and (null? body) (void-element? tag)) (display " />" port))
((eqv? tag 'script) (display #\> port) (unless (null? body) (display (car body) port)) (display "</script>" port))
(else (begin
(display #\> port)
(for-each (cut sxml->html <> port) body)
(format port "</~a>" tag)))))
(define (doctype->html doctype port)
(format port "<!DOCTYPE ~a>" doctype))
(define* (sxml->html tree #:optional (port (current-output-port)))
"Write the serialized HTML form of TREE to PORT."
(match tree
(() *unspecified*)
(('doctype type)
(doctype->html type port))
(((? symbol? tag) ('@ attrs ...) body ...)
(element->html tag attrs body port))
(((? symbol? tag) body ...)
(element->html tag '() body port))
((nodes ...)
(for-each (cut sxml->html <> port) nodes))
((? string? text)
(string->escaped-html text port))
;; Render arbitrary Scheme objects, too.
(obj (object->escaped-html obj port))))
(export sxml->html)
