Is there a faster way to write this code?

michalmuskala · December 5, 2018, 11:18am

AFAIK the fastest way to do this is using binary pattern matching similar to what is done in Plug.HTML.html_escape/1

elixir-plug/plug/blob/master/lib/plug/html.ex#L41-L80


escapes = [
  {?<, "&lt;"},
  {?>, "&gt;"},
  {?&, "&amp;"},
  {?", "&quot;"},
  {?', "&#39;"}
]


for {match, insert} <- escapes do
  defp to_iodata(<<unquote(match), rest::bits>>, skip, original, acc) do
    to_iodata(rest, skip + 1, original, [acc | unquote(insert)])
  end
end


defp to_iodata(<<_char, rest::bits>>, skip, original, acc) do
  to_iodata(rest, skip, original, acc, 1)
end


defp to_iodata(<<>>, _skip, _original, acc) do
  acc

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