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diff --git a/lib/fast_sanitize/fragment.ex b/lib/fast_sanitize/fragment.ex
index a67e7f5..e3725d9 100644
--- a/lib/fast_sanitize/fragment.ex
+++ b/lib/fast_sanitize/fragment.ex
@@ -1,76 +1,76 @@
defmodule FastSanitize.Fragment do
@moduledoc "Processing of HTML fragment trees."
import Plug.HTML, only: [html_escape_to_iodata: 1]
def to_tree(bin) do
with {:html, _, [{:head, _, _}, {:body, _, fragment}]} <-
Myhtmlex.decode(bin, format: [:nil_self_closing, :comment_tuple3, :html_atoms]) do
{:ok, fragment}
else
e ->
{:error, e}
end
end
defp build_attr_chunks([]), do: ""
defp build_attr_chunks(attrs) do
List.foldr(attrs, [], fn {k, v}, iodata ->
[[" ", html_escape_to_iodata(k), "=\"", html_escape_to_iodata(v), "\""] | iodata]
end)
end
defp build_start_tag(tag, attrs, nil), do: ["<", to_string(tag), build_attr_chunks(attrs), "/>"]
- defp build_start_tag(tag, attrs, _children) when length(attrs) == 0,
+ defp build_start_tag(tag, attrs, _children) when attrs == [],
do: ["<", to_string(tag), ">"]
defp build_start_tag(tag, attrs, _children),
do: ["<", to_string(tag), build_attr_chunks(attrs), ">"]
# empty tuple - fragment was clobbered, return nothing
defp fragment_to_html(nil, _), do: ""
defp fragment_to_html({}, _), do: ""
# text node
defp fragment_to_html(text, _) when is_binary(text), do: html_escape_to_iodata(text)
# comment node
defp fragment_to_html({:comment, _, text}, _), do: ["<!-- ", text, " -->"]
# bare subtree
defp fragment_to_html(subtree, scrubber) when is_list(subtree) do
subtree_to_iodata(subtree, scrubber)
end
# a node which can never accept children will have nil instead of a subtree
defp fragment_to_html({tag, attrs, nil}, _), do: build_start_tag(tag, attrs, nil)
# every other case, assume a subtree
defp fragment_to_html({tag, attrs, subtree}, scrubber) do
with start_tag <- build_start_tag(tag, attrs, subtree),
end_tag <- ["</", to_string(tag), ">"],
subtree <- subtree_to_iodata(subtree, scrubber) do
[start_tag, subtree, end_tag]
end
end
defp subtree_to_html([], _), do: {:ok, ""}
defp subtree_to_html(tree, scrubber) do
iodata = subtree_to_iodata(tree, scrubber)
rendered = :erlang.iolist_to_binary(iodata)
{:ok, rendered}
end
defp subtree_to_iodata(tree, scrubber) do
List.foldr(tree, [], fn node, iodata ->
[fragment_to_html(scrubber.scrub(node), scrubber) | iodata]
end)
end
def to_html(tree, scrubber \\ FastSanitize.Sanitizer.Dummy),
do: subtree_to_html(tree, scrubber)
end

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