From df3d77e2e5a397b636f7d698cbf1f9dbe67b219f Mon Sep 17 00:00:00 2001
From: yuin <yuin@inforno.net>
Date: Fri, 14 Jun 2024 21:40:31 +0900
Subject: [PATCH] Fixes #455

---
 .github/workflows/test.yaml       |  4 ++--
 extension/_test/strikethrough.txt | 20 ++++++++++++++++----
 extension/strikethrough.go        |  3 ++-
 3 files changed, 20 insertions(+), 7 deletions(-)

diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index c382846..5009782 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -5,7 +5,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        go-version: [1.19.x, 1.20.x]
+        go-version: [1.21.x, 1.22.x]
         platform: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.platform }}
     steps:
@@ -16,7 +16,7 @@ jobs:
     - name: Checkout code
       uses: actions/checkout@v3
     - name: Run lints
-      uses: golangci/golangci-lint-action@v3
+      uses: golangci/golangci-lint-action@v6
       with:
         version: latest
       if: "matrix.platform == 'ubuntu-latest'" # gofmt linter fails on Windows for CRLF problems
diff --git a/extension/_test/strikethrough.txt b/extension/_test/strikethrough.txt
index e74f58d..5f37627 100644
--- a/extension/_test/strikethrough.txt
+++ b/extension/_test/strikethrough.txt
@@ -5,8 +5,6 @@
 <p><del>Hi</del> Hello, world!</p>
 //= = = = = = = = = = = = = = = = = = = = = = = =//
 
-
-
 2
 //- - - - - - - - -//
 This ~~has a
@@ -17,11 +15,25 @@ new paragraph~~.
 <p>new paragraph~~.</p>
 //= = = = = = = = = = = = = = = = = = = = = = = =//
 
-
-
 3
 //- - - - - - - - -//
 ~Hi~ Hello, world!
 //- - - - - - - - -//
 <p><del>Hi</del> Hello, world!</p>
 //= = = = = = = = = = = = = = = = = = = = = = = =//
+
+4: Three or more tildes do not create a strikethrough
+//- - - - - - - - -//
+This will ~~~not~~~ strike.
+//- - - - - - - - -//
+<p>This will ~~~not~~~ strike.</p>
+//= = = = = = = = = = = = = = = = = = = = = = = =//
+
+5: Leading three or more tildes do not create a strikethrough, create a code block
+//- - - - - - - - -//
+~~~Hi~~~ Hello, world!
+//- - - - - - - - -//
+<pre><code class="language-Hi~~~"></code></pre>
+//= = = = = = = = = = = = = = = = = = = = = = = =//
+
+
diff --git a/extension/strikethrough.go b/extension/strikethrough.go
index fbb099f..9fc0bec 100644
--- a/extension/strikethrough.go
+++ b/extension/strikethrough.go
@@ -47,9 +47,10 @@ func (s *strikethroughParser) Parse(parent gast.Node, block text.Reader, pc pars
 	before := block.PrecendingCharacter()
 	line, segment := block.PeekLine()
 	node := parser.ScanDelimiter(line, before, 1, defaultStrikethroughDelimiterProcessor)
-	if node == nil {
+	if node == nil || node.OriginalLength > 2 || before == '~' {
 		return nil
 	}
+
 	node.Segment = segment.WithStop(segment.Start + node.OriginalLength)
 	block.Advance(node.OriginalLength)
 	pc.PushDelimiter(node)