added text node to html node conversion function

src/textnode.py

@@ -1,3 +1,5 @@
+from htmlnode import LeafNode
+
 text_type_text = "text"
 text_type_bold = "bold"
 text_type_italic = "italic"
@@ -5,6 +7,7 @@ text_type_code = "code"
 text_type_link = "link"
 text_type_image = "image"
 
+
 class TextNode:
     def __init__(self, text, text_type, url=None) -> None:
         self.text = text
@@ -17,6 +20,25 @@ class TextNode:
             and self.text_type == other_node.text_type
             and self.url == other_node.url
         )
-    
+
     def __repr__(self) -> str:
         return f"TextNode({self.text}, {self.text_type}, {self.url})"
+
+
+def text_node_to_html_node(text_node):
+    text = text_node.text
+    match text_node.text_type:
+        case "text":
+            return LeafNode(None, text)
+        case "bold":
+            return LeafNode("b", text)
+        case "italic":
+            return LeafNode("i", text)
+        case "code":
+            return LeafNode("code", text)
+        case "link":
+            return LeafNode("a", text, {"href": text_node.url})
+        case "image":
+            return LeafNode("img", "", {"src": text_node.url, "alt": text})
+        case _:
+            raise ValueError(f"Invalid text type: {text_node.text_type}")