add vendoring

vendor/maunium.net/go/mautrix/format/mdext/simplespoiler.go

@@ -0,0 +1,62 @@
+// 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/parser"
+	"github.com/yuin/goldmark/renderer"
+	"github.com/yuin/goldmark/text"
+	"github.com/yuin/goldmark/util"
+)
+
+type simpleSpoilerParser struct{}
+
+var defaultSimpleSpoilerParser = &simpleSpoilerParser{}
+
+func NewSimpleSpoilerParser() parser.InlineParser {
+	return defaultSimpleSpoilerParser
+}
+
+func (s *simpleSpoilerParser) Trigger() []byte {
+	return []byte{'|'}
+}
+
+func (s *simpleSpoilerParser) Parse(parent ast.Node, block text.Reader, pc parser.Context) ast.Node {
+	// This is basically copied from https://github.com/yuin/goldmark/blob/master/extension/strikethrough.go
+	before := block.PrecendingCharacter()
+	line, segment := block.PeekLine()
+	node := parser.ScanDelimiter(line, before, 2, defaultSpoilerDelimiterProcessor)
+	if node == nil {
+		return nil
+	}
+	node.Segment = segment.WithStop(segment.Start + node.OriginalLength)
+	block.Advance(node.OriginalLength)
+	pc.PushDelimiter(node)
+	return node
+}
+
+func (s *simpleSpoilerParser) CloseBlock(parent ast.Node, pc parser.Context) {
+	// nothing to do
+}
+
+type simpleSpoiler struct{}
+
+// SimpleSpoiler is an extension that allow you to use simple spoiler expression like '||text||' .
+//
+// For spoilers with reasons ('||reason|text||'), use the Spoiler extension.
+var SimpleSpoiler = &simpleSpoiler{}
+
+func (e *simpleSpoiler) Extend(m goldmark.Markdown) {
+	m.Parser().AddOptions(parser.WithInlineParsers(
+		util.Prioritized(NewSimpleSpoilerParser(), 500),
+	))
+	m.Renderer().AddOptions(renderer.WithNodeRenderers(
+		util.Prioritized(NewSpoilerHTMLRenderer(), 500),
+	))
+}