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Earmark is a pure-Elixir Markdown converter. It is intended to be used as a library (just call Earmark.as_html), but can also be used as a command-line tool (run mix escript.build first). Output generation is pluggable.

Retired package: Deprecated - Earmark is no longer maintained. Migrate to a replacement, for example MDEx (https://hex.pm/packages/mdex).
Security advisory: This version has known vulnerabilities. View advisories
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earmark lib earmark helpers pure_link_helpers.ex
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lib/earmark/helpers/pure_link_helpers.ex 

defmodule Earmark.Helpers.PureLinkHelpers do

  @moduledoc false



  import Earmark.Helpers.StringHelpers, only: [betail: 2]

  import Earmark.Helpers.AstHelpers, only: [render_link: 2]



  @pure_link_rgx ~r{\A(\s*)(\()?(https?://[[:alnum:]"'*@:+-_{\}()/.%\#]*)}u

  def convert_pure_link(src) do

    case Regex.run(@pure_link_rgx, src) do

      [_match, spaces, "", link_text] -> reparse_link(String.length(spaces), link_text, 0)

      [_match, spaces, _, link_text]  -> remove_trailing_closing_parens(String.length(spaces), link_text) 

      _ -> nil

      end

  end



  defp determine_ending_parens_by_count(leading_spaces_count, prefix, surplus_on_closing_parens) do

    graphemes = String.graphemes(prefix)

    open_parens_count = Enum.count(graphemes, &(&1 == "("))

    close_parens_count = Enum.count(graphemes, &(&1 == ")"))

    delta = open_parens_count - close_parens_count

    take = min(delta, surplus_on_closing_parens)

    needed =

    :lists.duplicate(max(0, take), ")")

    |> Enum.join

    {link(prefix <> needed), String.length(prefix) + leading_spaces_count + max(0,take)} 

  end



  @split_at_ending_parens ~r{(.*?)(\)*)\z}

  defp remove_trailing_closing_parens(leading_spaces_count, link_text) do

    [_, _prefix, suffix] = Regex.run(@split_at_ending_parens, link_text)

    case suffix do

      "" -> {"(", leading_spaces_count + 1}

      _  -> case convert_pure_link(betail(link_text, 1)) do

        {link, length} -> {["(", link, ")"], length + 2}

        _ -> nil

      end

    end

  end



  defp reparse_link(leading_spaces_count, link_text, open_count) do

    [_, prefix, suffix] = Regex.run(@split_at_ending_parens, link_text)

    nof_closing_parens = String.length(suffix)

    if nof_closing_parens >= open_count do

      determine_ending_parens_by_count(leading_spaces_count, prefix, nof_closing_parens - open_count)

    end

  end



  defp link(text), do: render_link(text, text)



end