From 5266a62685cfb9c449bb6543f6da77e61af4bbf5 Mon Sep 17 00:00:00 2001
From: Steven <stevenlgtm@gmail.com>
Date: Thu, 14 Dec 2023 00:04:20 +0800
Subject: [PATCH] chore: implement html renderer

---
 plugin/gomark/parser/paragraph.go        |  9 ++---
 plugin/gomark/parser/paragraph_test.go   | 26 ++++++++++++++
 plugin/gomark/parser/parser_test.go      | 25 ++++++++++++--
 plugin/gomark/renderer/html/html.go      | 43 ++++++++++++++++++++++--
 plugin/gomark/renderer/html/html_test.go | 12 +++++--
 5 files changed, 103 insertions(+), 12 deletions(-)

diff --git a/plugin/gomark/parser/paragraph.go b/plugin/gomark/parser/paragraph.go
index 41c598d3..a40c9962 100644
--- a/plugin/gomark/parser/paragraph.go
+++ b/plugin/gomark/parser/paragraph.go
@@ -17,17 +17,18 @@ func NewParagraphParser() *ParagraphParser {
 
 func (*ParagraphParser) Match(tokens []*tokenizer.Token) (int, bool) {
 	contentTokens := []*tokenizer.Token{}
-	cursor := 0
-	for ; cursor < len(tokens); cursor++ {
-		token := tokens[cursor]
+	for _, token := range tokens {
+		contentTokens = append(contentTokens, token)
 		if token.Type == tokenizer.Newline {
 			break
 		}
-		contentTokens = append(contentTokens, token)
 	}
 	if len(contentTokens) == 0 {
 		return 0, false
 	}
+	if len(contentTokens) == 1 && contentTokens[0].Type == tokenizer.Newline {
+		return 0, false
+	}
 	return len(contentTokens), true
 }
 
diff --git a/plugin/gomark/parser/paragraph_test.go b/plugin/gomark/parser/paragraph_test.go
index 387bc06a..e2f50249 100644
--- a/plugin/gomark/parser/paragraph_test.go
+++ b/plugin/gomark/parser/paragraph_test.go
@@ -18,6 +18,10 @@ func TestParagraphParser(t *testing.T) {
 			text:      "",
 			paragraph: nil,
 		},
+		{
+			text:      "\n",
+			paragraph: nil,
+		},
 		{
 			text: "Hello world!",
 			paragraph: &ast.Paragraph{
@@ -28,6 +32,28 @@ func TestParagraphParser(t *testing.T) {
 				},
 			},
 		},
+		{
+			text: "Hello world!\n",
+			paragraph: &ast.Paragraph{
+				Children: []ast.Node{
+					&ast.Text{
+						Content: "Hello world!",
+					},
+					&ast.LineBreak{},
+				},
+			},
+		},
+		{
+			text: "Hello world!\n\nNew paragraph.",
+			paragraph: &ast.Paragraph{
+				Children: []ast.Node{
+					&ast.Text{
+						Content: "Hello world!",
+					},
+					&ast.LineBreak{},
+				},
+			},
+		},
 	}
 
 	for _, test := range tests {
diff --git a/plugin/gomark/parser/parser_test.go b/plugin/gomark/parser/parser_test.go
index c5fed67c..22cc771f 100644
--- a/plugin/gomark/parser/parser_test.go
+++ b/plugin/gomark/parser/parser_test.go
@@ -57,9 +57,9 @@ func TestParser(t *testing.T) {
 						&ast.Text{
 							Content: "!",
 						},
+						&ast.LineBreak{},
 					},
 				},
-				&ast.LineBreak{},
 				&ast.Paragraph{
 					Children: []ast.Node{
 						&ast.Text{
@@ -84,15 +84,36 @@ func TestParser(t *testing.T) {
 						&ast.Text{
 							Content: "!",
 						},
+						&ast.LineBreak{},
 					},
 				},
-				&ast.LineBreak{},
 				&ast.CodeBlock{
 					Language: "javascript",
 					Content:  "console.log(\"Hello world!\");",
 				},
 			},
 		},
+		{
+			text: "Hello world!\n\nNew paragraph.",
+			nodes: []ast.Node{
+				&ast.Paragraph{
+					Children: []ast.Node{
+						&ast.Text{
+							Content: "Hello world!",
+						},
+						&ast.LineBreak{},
+					},
+				},
+				&ast.LineBreak{},
+				&ast.Paragraph{
+					Children: []ast.Node{
+						&ast.Text{
+							Content: "New paragraph.",
+						},
+					},
+				},
+			},
+		},
 	}
 
 	for _, test := range tests {
diff --git a/plugin/gomark/renderer/html/html.go b/plugin/gomark/renderer/html/html.go
index 9c8759c8..ce84207c 100644
--- a/plugin/gomark/renderer/html/html.go
+++ b/plugin/gomark/renderer/html/html.go
@@ -11,17 +11,17 @@ import (
 // nolint
 type HTMLRenderer struct {
 	output  *bytes.Buffer
-	context *renderContext
+	context *RendererContext
 }
 
-type renderContext struct {
+type RendererContext struct {
 }
 
 // NewHTMLRenderer creates a new HTMLRenderer.
 func NewHTMLRenderer() *HTMLRenderer {
 	return &HTMLRenderer{
 		output:  new(bytes.Buffer),
-		context: &renderContext{},
+		context: &RendererContext{},
 	}
 }
 
@@ -57,6 +57,43 @@ func (r *HTMLRenderer) RenderNode(node ast.Node) {
 		if prevSibling == nil || prevSibling.Type() != ast.NodeTypeBlockquote {
 			r.output.WriteString("</blockquote>")
 		}
+	case *ast.BoldItalic:
+		r.output.WriteString("<strong><em>")
+		r.output.WriteString(n.Content)
+		r.output.WriteString("</em></strong>")
+	case *ast.Bold:
+		r.output.WriteString("<strong>")
+		r.output.WriteString(n.Content)
+		r.output.WriteString("</strong>")
+	case *ast.Italic:
+		r.output.WriteString("<em>")
+		r.output.WriteString(n.Content)
+		r.output.WriteString("</em>")
+	case *ast.Code:
+		r.output.WriteString("<code>")
+		r.output.WriteString(n.Content)
+		r.output.WriteString("</code>")
+	case *ast.Link:
+		r.output.WriteString(`<a href="`)
+		r.output.WriteString(n.URL)
+		r.output.WriteString(`">`)
+		r.output.WriteString(n.Text)
+		r.output.WriteString("</a>")
+	case *ast.Image:
+		r.output.WriteString(`<img src="`)
+		r.output.WriteString(n.URL)
+		r.output.WriteString(`" alt="`)
+		r.output.WriteString(n.AltText)
+		r.output.WriteString(`" />`)
+	case *ast.Tag:
+		r.output.WriteString(`<span>`)
+		r.output.WriteString(`# `)
+		r.output.WriteString(n.Content)
+		r.output.WriteString(`</span>`)
+	case *ast.Strikethrough:
+		r.output.WriteString(`<del>`)
+		r.output.WriteString(n.Content)
+		r.output.WriteString(`</del>`)
 	case *ast.Text:
 		r.output.WriteString(n.Content)
 	default:
diff --git a/plugin/gomark/renderer/html/html_test.go b/plugin/gomark/renderer/html/html_test.go
index 83dc5f0d..30b78ee0 100644
--- a/plugin/gomark/renderer/html/html_test.go
+++ b/plugin/gomark/renderer/html/html_test.go
@@ -22,6 +22,14 @@ func TestHTMLRenderer(t *testing.T) {
 			text:     "> Hello\n> world!",
 			expected: `<blockquote>Hello<br>world!</blockquote>`,
 		},
+		{
+			text:     "*Hello* world!",
+			expected: `<p><em>Hello</em> world!</p>`,
+		},
+		{
+			text:     "**Hello** world!",
+			expected: `<p><strong>Hello</strong> world!</p>`,
+		},
 	}
 
 	for _, test := range tests {
@@ -29,8 +37,6 @@ func TestHTMLRenderer(t *testing.T) {
 		nodes, err := parser.Parse(tokens)
 		require.NoError(t, err)
 		actual := NewHTMLRenderer().Render(nodes)
-		if actual != test.expected {
-			t.Errorf("expected: %s, actual: %s", test.expected, actual)
-		}
+		require.Equal(t, test.expected, actual)
 	}
 }