ref: d6ed17c60fd13c933347110c720afa09e04df1c8
dir: /markup/blackfriday/renderer.go/
// Copyright 2019 The Hugo Authors. All rights reserved. // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. package blackfriday import ( "bytes" "strings" "github.com/russross/blackfriday" ) // hugoHTMLRenderer wraps a blackfriday.Renderer, typically a blackfriday.Html // adding some custom behaviour. type hugoHTMLRenderer struct { c *blackfridayConverter blackfriday.Renderer } // BlockCode renders a given text as a block of code. // Pygments is used if it is setup to handle code fences. func (r *hugoHTMLRenderer) BlockCode(out *bytes.Buffer, text []byte, lang string) { if r.c.cfg.MarkupConfig.Highlight.CodeFences { str := strings.Trim(string(text), "\n\r") highlighted, _ := r.c.cfg.Highlight(str, lang, "") out.WriteString(highlighted) } else { r.Renderer.BlockCode(out, text, lang) } } // ListItem adds task list support to the Blackfriday renderer. func (r *hugoHTMLRenderer) ListItem(out *bytes.Buffer, text []byte, flags int) { if !r.c.bf.TaskLists { r.Renderer.ListItem(out, text, flags) return } switch { case bytes.HasPrefix(text, []byte("[ ] ")): text = append([]byte(`<label><input type="checkbox" disabled class="task-list-item">`), text[3:]...) text = append(text, []byte(`</label>`)...) case bytes.HasPrefix(text, []byte("[x] ")) || bytes.HasPrefix(text, []byte("[X] ")): text = append([]byte(`<label><input type="checkbox" checked disabled class="task-list-item">`), text[3:]...) text = append(text, []byte(`</label>`)...) } r.Renderer.ListItem(out, text, flags) } // List adds task list support to the Blackfriday renderer. func (r *hugoHTMLRenderer) List(out *bytes.Buffer, text func() bool, flags int) { if !r.c.bf.TaskLists { r.Renderer.List(out, text, flags) return } marker := out.Len() r.Renderer.List(out, text, flags) if out.Len() > marker { list := out.Bytes()[marker:] if bytes.Contains(list, []byte("task-list-item")) { // Find the index of the first >, it might be 3 or 4 depending on whether // there is a new line at the start, but this is safer than just hardcoding it. closingBracketIndex := bytes.Index(list, []byte(">")) // Rewrite the buffer from the marker out.Truncate(marker) // Safely assuming closingBracketIndex won't be -1 since there is a list // May be either dl, ul or ol list := append(list[:closingBracketIndex], append([]byte(` class="task-list"`), list[closingBracketIndex:]...)...) out.Write(list) } } }