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diff --git a/lib/bbcode/generator.ex b/lib/bbcode/generator.ex
index 2db32f8..a878eae 100644
--- a/lib/bbcode/generator.ex
+++ b/lib/bbcode/generator.ex
@@ -1,77 +1,79 @@
defmodule BBCode.Generator do
@moduledoc """
Generate HTML from BBCode fragments in AST form.
The BBCode syntax supported is described at [bbcode.org][bbcode].
[bbcode]: https://www.bbcode.org/reference.php
"""
defp start_tag(tagname), do: Enum.join(["<", tagname, ">"])
defp end_tag(tagname), do: Enum.join(["</", tagname, ">"])
defp simple_tag(tagname, subtree) do
{:ok, text} = reduce_subtree(subtree)
{:ok, [start_tag(tagname), text, end_tag(tagname)] |> Enum.join()}
end
defp link_tag(url), do: Enum.join(["<a href=\"", url, "\">"])
defp reduce_subtree({:b, subtree}), do: simple_tag("strong", subtree)
defp reduce_subtree({:i, subtree}), do: simple_tag("em", subtree)
defp reduce_subtree({:u, subtree}), do: simple_tag("u", subtree)
defp reduce_subtree({:s, subtree}), do: simple_tag("del", subtree)
defp reduce_subtree({:ul, subtree}), do: simple_tag("ul", subtree)
defp reduce_subtree({:ol, subtree}), do: simple_tag("ol", subtree)
defp reduce_subtree({:li, subtree}), do: simple_tag("li", subtree)
defp reduce_subtree({:code, subtree}), do: simple_tag("pre", subtree)
defp reduce_subtree({:quote, subtree}), do: simple_tag("blockquote", subtree)
defp reduce_subtree({:table, subtree}), do: simple_tag("table", subtree)
defp reduce_subtree({:tr, subtree}), do: simple_tag("tr", subtree)
defp reduce_subtree({:th, subtree}), do: simple_tag("th", subtree)
defp reduce_subtree({:td, subtree}), do: simple_tag("td", subtree)
defp reduce_subtree({:url, text}),
do: {:ok, [link_tag(text), text, end_tag("a")] |> Enum.join()}
defp reduce_subtree({:url, address, text}),
do: {:ok, [link_tag(address), text, end_tag("a")] |> Enum.join()}
defp reduce_subtree({:img, address}),
do: {:ok, "<img src=\"#{address}\">"}
defp reduce_subtree({:img, size, address}) do
[width, height] = String.split(size, "x")
{width, ""} = Integer.parse(width)
{height, ""} = Integer.parse(height)
{:ok, "<img src=\"#{address}\" width=\"#{width}\" height=\"#{height}\">"}
end
+ defp reduce_subtree("\n"), do: {:ok, "<br>"}
+
defp reduce_subtree(text_node) when is_binary(text_node),
do: {:ok, text_node}
defp reduce_subtree(children) when is_list(children) do
with {:ok, new_tree} <-
Enum.reduce_while(children, {:ok, []}, fn x, {:ok, acc} ->
with {:ok, new_tree} <- reduce_subtree(x) do
{:cont, {:ok, acc ++ [new_tree]}}
else
{:error, e} ->
{:halt, {:error, e}}
end
end) do
{:ok, Enum.join(new_tree)}
else
{:error, e} ->
{:error, e}
end
end
defp reduce_subtree(tree), do: {:error, "unknown input #{inspect(tree)}"}
def to_html(tree) when is_list(tree), do: reduce_subtree(tree)
def to_html(_), do: {:error, "not a valid tree"}
end

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