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Retired package: Deprecated - Earmark is no longer maintained.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

defmodule EarmarkParser.Helpers.LookaheadHelpers do



  @moduledoc false



  import EarmarkParser.Helpers.LeexHelpers



  @doc """

  Indicates if the _numbered_line_ passed in leaves an inline code block open.



  If so returns a tuple whre the first element is the opening sequence of backticks,

  and the second the linenumber of the _numbered_line_



  Otherwise `{nil, 0}` is returned

  """

  def opens_inline_code(%{line: line, lnb: lnb}) do

    # case tokenize(line, with: :string_lexer) |> IO.inspect()  |> has_still_opening_backtix(nil) do

    case tokenize(line, with: :string_lexer) |> has_still_opening_backtix(nil) do

      nil -> {nil, 0}

      {_, btx} -> {btx, lnb}

    end

  end



  @doc """

  returns false if and only if the line closes a pending inline code

  *without* opening a new one.

  The opening backtix are passed in as second parameter.

  If the function does not return false it returns the (new or original)

  opening backtix

  """

  # (#{},{_,_}) -> {_,_}

  def still_inline_code(%{line: line, lnb: lnb}, old = {pending, _pending_lnb}) do

    case tokenize(line, with: :string_lexer) |> has_still_opening_backtix({:old, pending}) do

      nil -> {nil, 0}

      {:new, btx} -> {btx, lnb}

      {:old, _} -> old

    end

  end



  # A tokenized line {:verabtim, text} | {:backtix, ['``+]} is analyzed for

  # if it is closed (-> nil), not closed (-> {:old, btx}) or reopened (-> {:new, btx})

  # concerning backtix

  defp has_still_opening_backtix(tokens, opened_so_far)



  # Empty, done, but take care of tangeling escape (\)

  defp has_still_opening_backtix([], :force_outside), do: nil

  defp has_still_opening_backtix([], open), do: open



  # Outside state, represented by nil

  defp has_still_opening_backtix([{:other, _} | rest], nil),

    do: has_still_opening_backtix(rest, nil)



  defp has_still_opening_backtix([{:backtix, btx} | rest], nil),

    do: has_still_opening_backtix(rest, {:new, btx})



  defp has_still_opening_backtix([{:escape, _} | rest], nil),

    do: has_still_opening_backtix(rest, :force_outside)



  # Next state forced outside, represented by :force_outside

  defp has_still_opening_backtix([_ | rest], :force_outside),

    do: has_still_opening_backtix(rest, nil)



  # Inside state, represented by { :old | :new, btx }

  defp has_still_opening_backtix([{:backtix, btx} | rest], open = {_, openedbtx}) do

    if btx == openedbtx do

      has_still_opening_backtix(rest, nil)

    else

      has_still_opening_backtix(rest, open)

    end

  end



  defp has_still_opening_backtix([_ | rest], open = {_, _}),

    do: has_still_opening_backtix(rest, open)

end



# SPDX-License-Identifier: Apache-2.0