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Retired package: Deprecated - Earmark is no longer maintained.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

defmodule EarmarkParser.Helpers.AstHelpers do



  @moduledoc false



  import EarmarkParser.Ast.Emitter

  import EarmarkParser.Helpers



  alias EarmarkParser.Block



  @doc false

  def annotate(node, from_block)

  def annotate(node, %{annotation: nil}), do: node

  def annotate({tag, atts, children, meta}, %{annotation: annotation}),

    do: {tag, atts, children, Map.put(meta, :annotation, annotation)}

  def annotate({tag, atts, children, meta}, annotation),

    do: {tag, atts, children, Map.put(meta, :annotation, annotation)}



  @doc false

  def attrs_to_string_keys(key_value_pair)

  def attrs_to_string_keys({k, vs}) when is_list(vs) do

    {to_string(k), Enum.join(vs, " ")}

  end

  def attrs_to_string_keys({k, vs}) do

    {to_string(k),to_string(vs)}

  end



  @doc false

  def augment_tag_with_ial(tags, ial)

  def augment_tag_with_ial([{t, a, c, m}|tags], atts) do

    [{t, merge_attrs(a, atts), c, m}|tags]

  end

  def augment_tag_with_ial([], _atts) do

    [] 

  end



  @doc false

  def code_classes(language, prefix) do

    classes =

      ["" | String.split(prefix || "")]

      |> Enum.map(fn pfx -> "#{pfx}#{language}" end)

      {"class", classes |> Enum.join(" ")}

  end



  @doc false

  def codespan(text) do 

    emit("code", text, class: "inline")

  end



  @doc false

  def render_footnote_link(ref, backref, number) do

    emit("a", to_string(number), href: "##{ref}", id: backref, class: "footnote", title: "see footnote")

  end



  @doc false

  def render_code(%Block.Code{lines: lines}) do

    lines |> Enum.join("\n")

  end



  @remove_escapes ~r{ \\ (?! \\ ) }x

  @doc false

  def render_image(text, href, title) do

    alt = text |> escape() |> String.replace(@remove_escapes, "")



    if title do

      emit("img", [], src: href, alt: alt, title: title)

    else

      emit("img", [], src: href, alt: alt)

    end

  end



  @doc false

  def render_link(url, text) do

    emit("a", text, href: _encode(url))

  end





  ##############################################

  # add attributes to the outer tag in a block #

  ##############################################





  @verbatims ~r<%[\da-f]{2}>i

  defp _encode(url) do

    url

    |> String.split(@verbatims, include_captures: true)

    |> Enum.chunk_every(2)

    |> Enum.map(&_encode_chunk/1)

    |> IO.chardata_to_string

  end



  defp _encode_chunk([encodable, verbatim]), do: [URI.encode(encodable), verbatim]

  defp _encode_chunk([encodable]), do: URI.encode(encodable)



  @doc false

  def merge_attrs(maybe_atts, new_atts)

  def merge_attrs(nil, new_atts), do: new_atts

  def merge_attrs(atts, new) when is_list(atts) do

    atts

    |> Enum.into(%{})

    |> merge_attrs(new)

  end



  def merge_attrs(atts, new) do

    atts

    |> Map.merge(new, &_value_merger/3)

    |> Enum.into([])

    |> Enum.map(&attrs_to_string_keys/1)

  end



  defp _value_merger(key, val1, val2)

  defp _value_merger(_, val1, val2) when is_list(val1) do

    val1 ++ [val2]

  end

  defp _value_merger(_, val1, val2) do

    [val1, val2]

  end





end

# SPDX-License-Identifier: Apache-2.0