defmodule Earmark.Parser.Ast.Renderer.HtmlRenderer do

  import Earmark.Parser.Context, only: [prepend: 2]
  import Earmark.Parser.Helpers.HtmlParser
  import Earmark.Parser.Helpers.AstHelpers, only: [annotate: 2]

  @moduledoc false

  # Structural Renderer for html blocks
  def render_html_block(lines, context, annotation)
  def render_html_block(lines, context, annotation) do
    [tag] = parse_html(lines)
    tag_ = if annotation, do: annotate(tag, annotation), else: tag
    prepend(context, tag_)
  end

  def render_html_oneline([line|_], context, annotation \\ []) do
    [tag|rest] = parse_html([line])
    tag_ = if annotation, do: annotate(tag, annotation), else: tag
    prepend(context, [tag_|rest])
  end

  def render_html_comment_line(line) do
    html_comment_start = ~r{\A\s*<!--}
    html_comment_end = ~r{-->.*\z}

    line
    |> String.replace(html_comment_start, "")
    |> String.replace(html_comment_end, "")
  end
end