Ignore doctype at top of document

CHANGELOG.md

@@ -24,6 +24,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - LiveViewNative.Template.Engine
 - LiveViewNative.Component.Declarative
 - Template parser supports namespaced attribute keys
+- Templare parser ignores doctype tags at top of document
 
 ### Changed
 

lib/live_view_native/template/parser.ex

@@ -129,6 +129,26 @@ defmodule LiveViewNative.Template.Parser do
     end
   end
 
+  defp parse(<<"<!doctype ", document::binary>>, cursor, [], args) do
+    cursor = move_cursor(cursor, ~c"<!doctype ")
+
+    ignore_doctype(document, cursor, args)
+    |> case do
+      {:ok, {document, cursor}} -> parse(document, cursor, [], args)
+      error -> error
+    end
+  end
+
+  defp parse(<<"<!DOCTYPE ", document::binary>>, cursor, [], args) do
+    cursor = move_cursor(cursor, ~c"<!DOCTYPE ")
+
+    ignore_doctype(document, cursor, args)
+    |> case do
+      {:ok, {document, cursor}} -> parse(document, cursor, [], args)
+      error -> error
+    end
+  end
+
   defp parse(<<"<", document::binary>>, cursor, nodes, args) do
     cursor = move_cursor(cursor, ?<)
 
@@ -152,6 +172,16 @@ defmodule LiveViewNative.Template.Parser do
     end
   end
 
+  defp ignore_doctype(<<">", document::binary>>, cursor, _args) do
+    cursor = move_cursor(cursor, ?>)
+    {:ok, {document, cursor}}
+  end
+
+  defp ignore_doctype(<<char::utf8, document::binary>>, cursor, args) when char in @chars do
+    cursor = move_cursor(cursor, char)
+    ignore_doctype(document, cursor, args)
+  end
+
   defp parse_text_node(<<"<", _document::binary>> = document, cursor, buffer, args) do
     return_text_node(document, cursor, buffer, args)
   end

test/live_view_native/template/parser_test.exs

@@ -203,6 +203,31 @@ defmodule LiveViewNative.Template.ParserTest do
       ]
     end
 
+    test "ignores document declrations" do
+      {:ok, nodes} = """
+        <!doctype gameboy>
+        <Text>Hello!</Text>
+      """
+      |> parse_document()
+
+      assert nodes == [
+        {"Text", [], ["Hello!"]}
+      ]
+    end
+
+    test "leading and trailing whitespace is ignored" do
+      {:ok, nodes} = """
+
+        <Text>Hello!</Text>
+
+      """
+      |> parse_document()
+
+      assert nodes == [
+        {"Text", [], ["Hello!"]}
+      ]
+    end
+
     test "invalid attribute key name" do
       doc = """
         <FooBar