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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Retired package: Deprecated - Earmark is no longer maintained.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).
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earmark lib earmark helpers attr_parser.ex
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lib/earmark/helpers/attr_parser.ex 

defmodule Earmark.Helpers.AttrParser do



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

  import Earmark.Message, only: [add_message: 2]



  alias Earmark.Context



  @type errorlist :: list(String.t)



  @spec parse_attrs(Context.t, String.t, number()) :: {Map.t, errorlist}

  def parse_attrs(context, attrs, lnb) do

    { attrs, errors } = _parse_attrs(%{}, attrs, [], lnb)

    { add_errors(context, errors, lnb), attrs }

  end



  defp _parse_attrs(dict, attrs, errors, lnb) do

    cond do

      Regex.match?(~r{^\s*$}, attrs) -> {dict, errors}



      match = Regex.run(~r{^\.(\S+)\s*}, attrs) ->

        [ leader, class ] = match

          Map.update(dict, "class", [ class ], &[ class | &1])

          |> _parse_attrs(behead(attrs, leader), errors, lnb)



      match = Regex.run(~r{^\#(\S+)\s*}, attrs) ->

        [ leader, id ] = match

          Map.update(dict, "id", [ id ], &[ id | &1])

          |> _parse_attrs(behead(attrs, leader), errors, lnb)



      # Might we being running into escape issues here too?

      match = Regex.run(~r{^(\S+)=\'([^\']*)'\s*}, attrs) -> #'

      [ leader, name, value ] = match

        Map.update(dict, name, [ value ], &[ value | &1])

        |> _parse_attrs(behead(attrs, leader), errors, lnb)



      # Might we being running into escape issues here too?

      match = Regex.run(~r{^(\S+)=\"([^\"]*)"\s*}, attrs) -> #"

      [ leader, name, value ] = match

        Map.update(dict, name, [ value ], &[ value | &1])

        |> _parse_attrs(behead(attrs, leader), errors, lnb)



      match = Regex.run(~r{^(\S+)=(\S+)\s*}, attrs) ->

        [ leader, name, value ] = match

          Map.update(dict, name, [ value ], &[ value | &1])

          |> _parse_attrs(behead(attrs, leader), errors, lnb)



      match = Regex.run(~r{^(\S+)\s*(.*)}, attrs) ->

        [ _, incorrect, rest  ] = match

        _parse_attrs(dict, rest, [ incorrect | errors ], lnb)



      :otherwise ->

        {dict, [attrs | errors ]}

    end

  end



  defp add_errors(context, [], _lnb), do: context

  defp add_errors(context, errors, lnb), do: add_message(context, {:warning, lnb, "Illegal attributes #{inspect errors} ignored in IAL"})

    

end