83 lines
2.1 KiB
Go
83 lines
2.1 KiB
Go
// Copyright 2014 The Gogs Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package base
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import (
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"bytes"
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"path"
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"github.com/gogits/gfm"
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)
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func isletter(c byte) bool {
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return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')
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}
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func isalnum(c byte) bool {
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return (c >= '0' && c <= '9') || isletter(c)
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}
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var validLinks = [][]byte{[]byte("http://"), []byte("https://"), []byte("ftp://"), []byte("mailto://")}
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func isLink(link []byte) bool {
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for _, prefix := range validLinks {
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if len(link) > len(prefix) && bytes.Equal(bytes.ToLower(link[:len(prefix)]), prefix) && isalnum(link[len(prefix)]) {
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return true
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}
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}
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return false
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}
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type CustomRender struct {
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gfm.Renderer
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urlPrefix string
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}
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func (options *CustomRender) Link(out *bytes.Buffer, link []byte, title []byte, content []byte) {
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if len(link) > 0 && !isLink(link) {
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if link[0] == '#' {
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link = append([]byte(options.urlPrefix), link...)
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} else {
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link = []byte(path.Join(options.urlPrefix, string(link)))
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}
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}
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options.Renderer.Link(out, link, title, content)
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}
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func RenderMarkdown(rawBytes []byte, urlPrefix string) []byte {
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htmlFlags := 0
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htmlFlags |= gfm.HTML_USE_XHTML
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// htmlFlags |= gfm.HTML_USE_SMARTYPANTS
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// htmlFlags |= gfm.HTML_SMARTYPANTS_FRACTIONS
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// htmlFlags |= gfm.HTML_SMARTYPANTS_LATEX_DASHES
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htmlFlags |= gfm.HTML_SKIP_HTML
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htmlFlags |= gfm.HTML_SKIP_STYLE
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htmlFlags |= gfm.HTML_SKIP_SCRIPT
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htmlFlags |= gfm.HTML_GITHUB_BLOCKCODE
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htmlFlags |= gfm.HTML_OMIT_CONTENTS
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htmlFlags |= gfm.HTML_COMPLETE_PAGE
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renderer := &CustomRender{
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Renderer: gfm.HtmlRenderer(htmlFlags, "", ""),
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urlPrefix: urlPrefix,
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}
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// set up the parser
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extensions := 0
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extensions |= gfm.EXTENSION_NO_INTRA_EMPHASIS
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extensions |= gfm.EXTENSION_TABLES
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extensions |= gfm.EXTENSION_FENCED_CODE
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extensions |= gfm.EXTENSION_AUTOLINK
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extensions |= gfm.EXTENSION_STRIKETHROUGH
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extensions |= gfm.EXTENSION_HARD_LINE_BREAK
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extensions |= gfm.EXTENSION_SPACE_HEADERS
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extensions |= gfm.EXTENSION_NO_EMPTY_LINE_BEFORE_BLOCK
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body := gfm.Markdown(rawBytes, renderer, extensions)
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return body
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}
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