goldmark.go

package jupyter

import (
	"bytes"

	"github.com/yuin/goldmark/ast"
	"github.com/yuin/goldmark/util"
)

// nodeToHTMLText is an unexported utility function from [goldmark/render/html] package,
// that writes node's content in HTML format.
//
// Text of the original license and copyright notice below:
//
//	MIT License
//
//	Copyright (c) 2019 Yusuke Inuzuka
//
//	Permission is hereby granted, free of charge, to any person obtaining a copy
//	of this software and associated documentation files (the "Software"), to deal
//	in the Software without restriction, including without limitation the rights
//	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//	copies of the Software, and to permit persons to whom the Software is
//	furnished to do so, subject to the following conditions:
//
//	The above copyright notice and this permission notice shall be included in all
//	copies or substantial portions of the Software.
//
//	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//	OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
//	SOFTWARE.
//
// [goldmark/render/html]: https://github.com/yuin/goldmark/blob/master/renderer/html/html.go
func nodeToHTMLText(n ast.Node, source []byte) []byte {
	var buf bytes.Buffer
	for c := n.FirstChild(); c != nil; c = c.NextSibling() {
		if s, ok := c.(*ast.String); ok && s.IsCode() {
			buf.Write(s.Text(source))
		} else if !c.HasChildren() {
			buf.Write(util.EscapeHTML(c.Text(source)))
			if t, ok := c.(*ast.Text); ok && t.SoftLineBreak() {
				buf.WriteByte('\n')
			}
		} else {
			buf.Write(nodeToHTMLText(c, source))
		}
	}
	return buf.Bytes()
}