62 lines
1.8 KiB
Go
62 lines
1.8 KiB
Go
|
// Copyright (c) 2022 Tulir Asokan
|
||
|
|
//
|
||
|
|
// This Source Code Form is subject to the terms of the Mozilla Public
|
||
|
|
// License, v. 2.0. If a copy of the MPL was not distributed with this
|
||
|
|
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
|
||
|
|
|
||
|
|
package mdext
|
||
|
|
|
||
|
|
import (
|
||
|
|
"github.com/yuin/goldmark"
|
||
|
|
"github.com/yuin/goldmark/ast"
|
||
|
|
"github.com/yuin/goldmark/renderer"
|
||
|
|
"github.com/yuin/goldmark/renderer/html"
|
||
|
|
"github.com/yuin/goldmark/util"
|
||
|
|
)
|
||
|
|
|
||
|
|
type extEscapeHTML struct{}
|
||
|
|
type escapingHTMLRenderer struct{}
|
||
|
|
|
||
|
|
// EscapeHTML is an extension that escapes HTML in the input markdown instead of passing it through as-is.
|
||
|
|
var EscapeHTML = &extEscapeHTML{}
|
||
|
|
var defaultEHR = &escapingHTMLRenderer{}
|
||
|
|
|
||
|
|
func (eeh *extEscapeHTML) Extend(m goldmark.Markdown) {
|
||
|
|
m.Renderer().AddOptions(renderer.WithNodeRenderers(util.Prioritized(defaultEHR, 0)))
|
||
|
|
}
|
||
|
|
|
||
|
|
func (ehr *escapingHTMLRenderer) RegisterFuncs(reg renderer.NodeRendererFuncRegisterer) {
|
||
|
|
reg.Register(ast.KindHTMLBlock, ehr.renderHTMLBlock)
|
||
|
|
reg.Register(ast.KindRawHTML, ehr.renderRawHTML)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (ehr *escapingHTMLRenderer) renderRawHTML(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
|
||
|
|
if !entering {
|
||
|
|
return ast.WalkSkipChildren, nil
|
||
|
|
}
|
||
|
|
n := node.(*ast.RawHTML)
|
||
|
|
l := n.Segments.Len()
|
||
|
|
for i := 0; i < l; i++ {
|
||
|
|
segment := n.Segments.At(i)
|
||
|
|
html.DefaultWriter.RawWrite(w, segment.Value(source))
|
||
|
|
}
|
||
|
|
return ast.WalkSkipChildren, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func (ehr *escapingHTMLRenderer) renderHTMLBlock(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
|
||
|
|
n := node.(*ast.HTMLBlock)
|
||
|
|
if entering {
|
||
|
|
l := n.Lines().Len()
|
||
|
|
for i := 0; i < l; i++ {
|
||
|
|
line := n.Lines().At(i)
|
||
|
|
html.DefaultWriter.RawWrite(w, line.Value(source))
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
if n.HasClosure() {
|
||
|
|
closure := n.ClosureLine
|
||
|
|
html.DefaultWriter.RawWrite(w, closure.Value(source))
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return ast.WalkContinue, nil
|
||
|
|
}
|