135 lines
3.6 KiB
Scheme
135 lines
3.6 KiB
Scheme
;;; Haunt --- Static site generator for GNU Guile
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;;; Copyright © 2015 David Thompson <davet@gnu.org>
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;;;
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;;; This file is part of Haunt.
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;;;
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;;; Haunt is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or
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;;; (at your option) any later version.
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;;;
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;;; Haunt is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;;; General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with Haunt. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;;
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;; SXML to HTML conversion.
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;;
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;;; Code:
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(define-module (haunt html)
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#:use-module (sxml simple)
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#:use-module (srfi srfi-26)
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#:use-module (ice-9 match)
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#:use-module (ice-9 format)
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#:use-module (ice-9 hash-table)
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#:export (sxml->html
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sxml->html-string))
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(define %void-elements
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'(area
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base
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br
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col
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command
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embed
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hr
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img
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input
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keygen
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link
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meta
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param
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source
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track
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wbr))
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(define (void-element? tag)
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"Return #t if TAG is a void element."
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(pair? (memq tag %void-elements)))
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(define %escape-chars
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(alist->hash-table
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'((#\" . "quot")
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(#\& . "amp")
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(#\' . "apos")
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(#\< . "lt")
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(#\> . "gt"))))
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(define (string->escaped-html s port)
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"Write the HTML escaped form of S to PORT."
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(define (escape c)
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(let ((escaped (hash-ref %escape-chars c)))
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(if escaped
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(format port "&~a;" escaped)
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(display c port))))
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(string-for-each escape s))
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(define (object->escaped-html obj port)
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"Write the HTML escaped form of OBJ to PORT."
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(string->escaped-html
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(call-with-output-string (cut display obj <>))
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port))
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(define (attribute-value->html value port)
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"Write the HTML escaped form of VALUE to PORT."
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(if (string? value)
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(string->escaped-html value port)
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(object->escaped-html value port)))
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(define (attribute->html attr value port)
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"Write ATTR and VALUE to PORT."
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(format port "~a=\"" attr)
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(attribute-value->html value port)
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(display #\" port))
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(define (element->html tag attrs body port)
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"Write the HTML TAG to PORT, where TAG has the attributes in the
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list ATTRS and the child nodes in BODY."
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(format port "<~a" tag)
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(for-each (match-lambda
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((attr value)
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(display #\space port)
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(attribute->html attr value port)))
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attrs)
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(if (and (null? body) (void-element? tag))
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(display " />" port)
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(begin
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(display #\> port)
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(for-each (cut sxml->html <> port) body)
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(format port "</~a>" tag))))
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(define (doctype->html doctype port)
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(format port "<!DOCTYPE ~a>" doctype))
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(define* (sxml->html tree #:optional (port (current-output-port)))
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"Write the serialized HTML form of TREE to PORT."
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(match tree
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(() *unspecified*)
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(('doctype type)
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(doctype->html type port))
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;; Unescaped, raw HTML output.
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(('raw html)
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(display html port))
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(((? symbol? tag) ('@ attrs ...) body ...)
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(element->html tag attrs body port))
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(((? symbol? tag) body ...)
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(element->html tag '() body port))
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((nodes ...)
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(for-each (cut sxml->html <> port) nodes))
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((? string? text)
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(string->escaped-html text port))
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;; Render arbitrary Scheme objects, too.
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(obj (object->escaped-html obj port))))
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(define (sxml->html-string sxml)
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"Render SXML as an HTML string."
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(call-with-output-string
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(lambda (port)
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(sxml->html sxml port))))
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