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earmark_parser

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AST parser and generator for Markdown

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earmark_parser lib earmark_parser ast renderer footnote_renderer.ex
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lib/earmark_parser/ast/renderer/footnote_renderer.ex 

defmodule EarmarkParser.Ast.Renderer.FootnoteRenderer do

  import EarmarkParser.Ast.Emitter

  alias EarmarkParser.{AstRenderer, Block, Context, Message}

  import Context, only: [clear_value: 1, prepend: 2]



  @moduledoc false



  @empty_set MapSet.new([])



  def render_defined_fns(%Block.FnList{blocks: footnotes}, context) do

    {elements, errors} = render_footnote_blocks(footnotes, context)



    ast =

      emit(

        "div",

        [

          emit("hr"),

          emit("ol", elements)

        ],

        class: "footnotes"

      )



    prepend(context, ast) |> Message.add_messages(errors)

  end



  defp _render_footnote_def(%Block.FnDef{blocks: blocks, id: id}, {ast, errors, context}=acc) do

    if MapSet.member?(context.referenced_footnote_ids, id) do

      context1 = AstRenderer.render(blocks, clear_value(context))

      a_attrs = %{title: "return to article", class: "reversefootnote", href: "#fnref:#{id}"}

      footnote_li_ast =

        emit("li", [emit("a", ["↩"], a_attrs) | context1.value],

         id: "fn:#{id}")

      {[footnote_li_ast|ast], MapSet.union(errors, context1.options.messages), context}

    else

      acc

    end

  end





  defp render_footnote_blocks(footnotes, context) do

    {elements, errors, _} =

      footnotes

      |> Enum.reduce({[], @empty_set, context}, &_render_footnote_def/2)



    {elements|>Enum.reverse, errors}

  end

end

#  SPDX-License-Identifier: Apache-2.0