feat: implement code block parser (#1727)

plugin/gomark/parser/code.go

@@ -0,0 +1,38 @@
+package parser
+
+import "github.com/usememos/memos/plugin/gomark/parser/tokenizer"
+
+type CodeParser struct {
+	Content string
+}
+
+func NewCodeParser() *CodeParser {
+	return &CodeParser{}
+}
+
+func (*CodeParser) Match(tokens []*tokenizer.Token) *CodeParser {
+	if len(tokens) < 3 {
+		return nil
+	}
+	if tokens[0].Type != tokenizer.Backtick {
+		return nil
+	}
+
+	content, matched := "", false
+	for _, token := range tokens[1:] {
+		if token.Type == tokenizer.Newline {
+			return nil
+		}
+		if token.Type == tokenizer.Backtick {
+			matched = true
+			break
+		}
+		content += token.Value
+	}
+	if !matched || len(content) == 0 {
+		return nil
+	}
+	return &CodeParser{
+		Content: content,
+	}
+}