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A foundation for building Elixir Phoenix apps — SaaS, social networks, ERP systems, marketplaces, and more

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phoenix_kit lib modules publishing page_builder renderer.ex
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lib/modules/publishing/page_builder/renderer.ex 

defmodule PhoenixKit.Modules.Publishing.PageBuilder.Renderer do

  @moduledoc """

  Renders AST nodes to HTML by delegating to component modules.

  """



  @doc """

  Renders an AST node to HTML.

  """

  def render(ast, assigns) when is_map(ast) do

    case resolve_component(ast.type) do

      {:ok, component_module} ->

        render_component(component_module, ast, assigns)



      {:error, :not_found} ->

        # Fallback for unknown components

        render_unknown(ast, assigns)

    end

  end



  def render(ast, _assigns) when is_list(ast) do

    {:ok,

     Phoenix.HTML.raw(

       Enum.map_join(ast, fn node ->

         case render(node, %{}) do

           {:ok, html} -> Phoenix.HTML.safe_to_string(html)

           {:error, _} -> ""

         end

       end)

     )}

  end



  def render(content, _assigns) when is_binary(content) do

    {:ok, Phoenix.HTML.raw(content)}

  end



  # Resolve component type to module

  defp resolve_component(:page), do: {:ok, PhoenixKit.Modules.Shared.Components.Page}

  defp resolve_component(:hero), do: {:ok, PhoenixKit.Modules.Shared.Components.Hero}

  defp resolve_component(:headline), do: {:ok, PhoenixKit.Modules.Shared.Components.Headline}



  defp resolve_component(:subheadline),

    do: {:ok, PhoenixKit.Modules.Shared.Components.Subheadline}



  defp resolve_component(:cta), do: {:ok, PhoenixKit.Modules.Shared.Components.CTA}

  defp resolve_component(:image), do: {:ok, PhoenixKit.Modules.Shared.Components.Image}

  defp resolve_component(:video), do: {:ok, PhoenixKit.Modules.Shared.Components.Video}



  defp resolve_component(:entityform),

    do: {:ok, PhoenixKit.Modules.Shared.Components.EntityForm}



  defp resolve_component(_), do: {:error, :not_found}



  # Render using the component module

  defp render_component(component_module, ast, assigns) do

    component_assigns = build_component_assigns(ast, assigns)



    try do

      html = component_module.render(component_assigns)

      {:ok, html}

    rescue

      e ->

        {:error, {:render_error, e}}

    end

  end



  # Build assigns map for component

  defp build_component_assigns(ast, parent_assigns) do

    base_assigns = %{

      __changed__: nil,

      variant: Map.get(ast.attributes, "variant", "default"),

      attributes: ast.attributes,

      content: ast[:content],

      children: ast[:children] || []

    }



    Map.merge(parent_assigns, base_assigns)

  end



  # Fallback renderer for unknown components

  defp render_unknown(ast, assigns) do

    content =

      cond do

        ast[:content] ->

          ast.content



        ast[:children] ->

          Enum.map_join(ast.children, fn child ->

            case render(child, assigns) do

              {:ok, html} -> Phoenix.HTML.safe_to_string(html)

              _ -> ""

            end

          end)



        true ->

          ""

      end



    {:ok, Phoenix.HTML.raw("<div class=\"unknown-component\">#{content}</div>")}

  end

end