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Parsing HTTP Link header with NimbleParsec

#nimbleparsec
chulkilee

chulkilee

Hi - I implemented HTTP Link header parser with nimble_parsec. I know there is ex_link_header but just took it as a chance to use the parser library :slight_smile:

Here is the gist link - any feedback would be welcome!

  • As , is not allowed, I may just split the whole string with , - but not sure I can leverage existing tool to handle optionally escaped string (e.g. Plug.Conn.Utils.params)
  • Probably I can switch all string with ascii_char since only ascii chars are allowed in the value
  • Not sure I’m using wrap/unwrap correctly :wink:
  • I do not want to create another “micro” library. What would be better place to put this? plug, phoenix, standalone package to cover HTTP headers
4 comments
#nimbleparsec
2011 4

Marked As Solved

valpackett

valpackett

haha, I already did (initially published to hex @ March 30, 2019):

but it has a generator as well as a parser. The forum showed me this thread as related when I was creating that thread about it :slight_smile:

2
Post #3

Also Liked

LostKobrakai

LostKobrakai

NimbleParsec can output the compiled module, so users don’t need nimble_parsec as dependency, if that’s the reasoning here.

1
Post #2
chulkilee

chulkilee OP

Another naive example at Tesla.Middleware.DecodeRels:"

src

  defp rels(link) do
    link
    |> String.split(",")
    |> Enum.map(&String.trim/1)
    |> Enum.map(&rel/1)
    |> Enum.into(%{})
  end

  defp rel(item) do
    Regex.run(~r/\A<(.+)>; rel="(.+)"\z/, item, capture: :all_but_first)
    |> Enum.reverse()
    |> List.to_tuple()
  end
1
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