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earmark

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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Retired package: Deprecated - Earmark is no longer maintained.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_parser helpers.ex
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lib/earmark_parser/helpers.ex 

defmodule EarmarkParser.Helpers do



  @moduledoc false

  @doc """

  Expand tabs to multiples of 4 columns

  """

  def expand_tabs(line) do

    Regex.replace(~r{(.*?)\t}, line, &expander/2)

  end



  @trailing_ial_rgx ~r< (?<!^)(?'ial'{: \s* [^}]+ \s* }) \s* \z >x

  @doc ~S"""

  Returns a tuple containing a potentially present IAL and the line w/o the IAL



      iex(1)> extract_ial("# A headline")

      {nil, "# A headline"}



      iex(2)> extract_ial("# A classy headline{:.classy}")

      {".classy", "# A classy headline"}



  An IAL line, remains an IAL line though



      iex(3)> extract_ial("{:.line-ial}")

      {nil, "{:.line-ial}"}

  """

  def extract_ial(line) do

    case Regex.split(@trailing_ial_rgx, line, include_captures: true, parts: 2, on: [:ial]) do

      [_] -> {nil, line}

      [line_, "{:" <> ial, _] ->

        ial_ =

          ial

          |> String.trim_trailing("}")

          |> String.trim()



        {ial_, String.trim_trailing(line_)}

    end

  end



  defp expander(_, leader) do

    extra = 4 - rem(String.length(leader), 4)

    leader <> pad(extra)

  end



  @doc """

  Remove newlines at end of line and optionally annotations

  """

  # def remove_line_ending(line, annotation \\ nil)

  def remove_line_ending(line, nil) do

    _trim_line({line, nil})

  end

  def remove_line_ending(line, annotation) do

    case Regex.run(annotation, line) do

      nil -> _trim_line({line, nil})

      match -> match |> tl() |> List.to_tuple |> _trim_line()

    end

  end



  defp _trim_line({line, annot}), do: {line |> String.trim_trailing("\n") |> String.trim_trailing("\r"), annot}



  defp pad(1), do: " "

  defp pad(2), do: "  "

  defp pad(3), do: "   "

  defp pad(4), do: "    "



  @doc """

  `Regex.replace` with the arguments in the correct order

  """



  def replace(text, regex, replacement, options \\ []) do

    Regex.replace(regex, text, replacement, options)

  end



  @doc """

  Replace <, >, and quotes with the corresponding entities. If

  `encode` is true, convert ampersands, too, otherwise only

   convert non-entity ampersands.

  """



  @amp_rgx ~r{&(?!#?\w+;)}



  def escape(html), do: _escape(Regex.replace(@amp_rgx, html, "&amp;"))





  defp _escape(html) do

    html

    |> String.replace("<", "&lt;")

    |> String.replace(">", "&gt;")

    |> String.replace("\"", "&quot;")

    |> String.replace("'", "&#39;")

  end

end



# SPDX-License-Identifier: Apache-2.0