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Retired package: Deprecated - Earmark is no longer maintained.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

defmodule Earmark.Parser.Helpers.HtmlParser do

  @moduledoc false



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

  import Earmark.Parser.LineScanner, only: [void_tag?: 1]



  def parse_html(lines)



  def parse_html([tag_line | rest]) do

    case _parse_tag(tag_line) do

      {:ok, tag, ""} -> [_parse_rest(rest, tag, [])]

      {:ok, tag, suffix} -> [_parse_rest(rest, tag, [suffix])]

      {:ext, tag, ""} -> [_parse_rest(rest, tag, [])]

      {:ext, tag, suffix} -> [_parse_rest(rest, tag, []), [suffix]]

    end

  end



  # Parse One Tag

  # -------------



  defp _parse_atts(string, tag, atts) do

    quoted_attr = ~r{\A ([-\w]+) \s* = \s* (["']) (.*?) \2 \s*}x

    unquoted_attr = ~r{\A ([-\w]+) (?: \s* = \s* ([^&\s>]*))? \s*}x



    case Regex.run(quoted_attr, string) do

      [all, name, _delim, value] -> _parse_atts(behead(string, all), tag, [{name, value}|atts])

      _ -> case Regex.run(unquoted_attr, string) do

             [all, name, value] -> _parse_atts(behead(string, all), tag, [{name, value}|atts])

             [all, name]        -> _parse_atts(behead(string, all), tag, [{name, name}|atts])

             _                  -> _parse_tag_tail(string, tag, atts)

      end

    end

  end



  defp _parse_tag(string) do

    # Are leading and trailing "-"s ok?

    tag_head = ~r{\A \s* <([-\w]+) \s*}x



    case Regex.run(tag_head, string) do

      [all, tag] -> _parse_atts(behead(string, all), tag, [])

    end

  end



  defp _parse_tag_tail(string, tag, atts) do

    tag_tail = ~r{\A .*? (/?)> \s* (.*) \z}x



    case Regex.run(tag_tail, string) do

      [_, closing, suffix]  ->

        suffix1 = String.replace(suffix, ~r{\s*</#{tag}>.*}, "")

        _close_tag_tail(tag, atts, closing != "", suffix1)

    end

  end



  defp _close_tag_tail(tag, atts, closing?, suffix) do

    if closing? || void_tag?(tag) do

      {:ext, {tag, Enum.reverse(atts)}, suffix}

    else

      {:ok, {tag, Enum.reverse(atts)}, suffix}

    end

  end



  # Iterate over lines inside a tag

  # -------------------------------



  @verbatim %{verbatim: true}

  defp _parse_rest(rest, tag_tpl, lines)



  defp _parse_rest([], tag_tpl, lines) do

    tag_tpl

    |> Tuple.insert_at(tuple_size(tag_tpl), Enum.reverse(lines))

    |> Tuple.insert_at(tuple_size(tag_tpl) + 1, @verbatim)

  end



  defp _parse_rest([last_line], {tag, _} = tag_tpl, lines) do

    case Regex.run(~r{\A\s*</#{tag}>\s*(.*)}, last_line) do

      nil ->

        tag_tpl

        |> Tuple.insert_at(tuple_size(tag_tpl), Enum.reverse([last_line | lines]))

        |> Tuple.insert_at(tuple_size(tag_tpl) + 1, @verbatim)



      [_, ""] ->

        tag_tpl

        |> Tuple.insert_at(tuple_size(tag_tpl), Enum.reverse(lines))

        |> Tuple.insert_at(tuple_size(tag_tpl) + 1, @verbatim)



      [_, suffix] ->

        [

          tag_tpl

          |> Tuple.insert_at(tuple_size(tag_tpl), Enum.reverse(lines))

          |> Tuple.insert_at(tuple_size(tag_tpl) + 1, @verbatim),

          suffix

        ]

    end

  end



  defp _parse_rest([inner_line | rest], tag_tpl, lines) do

    _parse_rest(rest, tag_tpl, [inner_line | lines])

  end

end

# SPDX-License-Identifier: Apache-2.0