From 10479a0204a2ad01b9aec8ab19fcc4d7c1b6a5c2 Mon Sep 17 00:00:00 2001
From: Carson <jackparadise520a@gmail.com>
Date: Mon, 26 Sep 2022 18:25:30 +0800
Subject: [PATCH] init Extender{renderer} (#2)

---
 v2/go.mod      |  5 +++++
 v2/main.go     | 25 +++++++++++++++++++++++++
 v2/renderer.go | 22 ++++++++++++++++++++++
 3 files changed, 52 insertions(+)
 create mode 100644 v2/go.mod
 create mode 100644 v2/main.go
 create mode 100644 v2/renderer.go

diff --git a/v2/go.mod b/v2/go.mod
new file mode 100644
index 0000000..b29917e
--- /dev/null
+++ b/v2/go.mod
@@ -0,0 +1,5 @@
+module github.com/CarsonSlovoka/goldmark-highlighting/v2
+
+go 1.19
+
+require github.com/yuin/goldmark v1.4.14
diff --git a/v2/main.go b/v2/main.go
new file mode 100644
index 0000000..561b098
--- /dev/null
+++ b/v2/main.go
@@ -0,0 +1,25 @@
+package highlighting
+
+import (
+	"github.com/yuin/goldmark"
+	"github.com/yuin/goldmark/renderer"
+	"github.com/yuin/goldmark/util"
+)
+
+type highlightingExtender struct {
+}
+
+func NewHighlightingExtender() goldmark.Extender {
+	return &highlightingExtender{}
+}
+
+// Extend adds a hashtag parser to a Goldmark parser
+func (e *highlightingExtender) Extend(m goldmark.Markdown) {
+	// m.Parser().AddOptions() // 如果您的擴展不需要再額外自己定義ast，那就不需要再定義Parser。 Parser只是在Parse的時候，會把相關屬性塞給該ast罷了，而codeblock運用的ast用已定義的ast.KindFencedCodeBlock即可，所以不需額外定義
+
+	m.Renderer().AddOptions(
+		renderer.WithNodeRenderers(
+			util.Prioritized(NewHighlightingHTMLRenderer(), 200),
+		),
+	)
+}
diff --git a/v2/renderer.go b/v2/renderer.go
new file mode 100644
index 0000000..6ceb569
--- /dev/null
+++ b/v2/renderer.go
@@ -0,0 +1,22 @@
+package highlighting
+
+import (
+	"github.com/yuin/goldmark/ast"
+	"github.com/yuin/goldmark/renderer"
+	"github.com/yuin/goldmark/util"
+)
+
+type highlightingHTMLRenderer struct{}
+
+func NewHighlightingHTMLRenderer() renderer.NodeRenderer {
+	return &highlightingHTMLRenderer{}
+}
+
+func (r *highlightingHTMLRenderer) RegisterFuncs(reg renderer.NodeRendererFuncRegisterer) {
+	reg.Register(ast.KindFencedCodeBlock, r.nodeRendererFunc) // codeblock不需要再定義額外的ast去描述，基於原始的KindFencedCodeBlock增加額外的判斷即可
+}
+
+// nodeRendererFunc 此函數可以把結果直接寫到writer之中，就能對輸出產生影響
+func (r *highlightingHTMLRenderer) nodeRendererFunc(writer util.BufWriter, source []byte, n ast.Node, entering bool) (ast.WalkStatus, error) {
+	return 0, nil
+}