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Hybrid Retrieval-Augmented Generation (RAG) system for multi-language codebase analysis. MCP server combining static analysis, knowledge graphs, semantic search with local ML, and advanced graph algorithms for AI-powered code understanding.

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ragex lib ragex rag context_builder.ex
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lib/ragex/rag/context_builder.ex 

defmodule Ragex.RAG.ContextBuilder do

  @moduledoc """

  Formats retrieved code for AI consumption.



  Handles:

  - Context window limits

  - Code snippet formatting

  - Metadata inclusion

  - Summarization for large contexts

  """



  # characters

  @max_context_length 8000



  def build_context(results, opts \\ []) do

    include_code = Keyword.get(opts, :include_code, true)

    max_length = Keyword.get(opts, :max_context_length, @max_context_length)



    context =

      results

      |> Enum.map_join("\n\n---\n\n", &format_result(&1, include_code))

      |> truncate_if_needed(max_length)



    {:ok, context}

  end



  defp format_result(result, include_code) do

    """

    ## #{result[:node_id] || "Unknown"}



    **File**: #{result[:file] || "unknown"}

    **Line**: #{result[:line] || "N/A"}

    **Score**: #{Float.round(result[:score] || 0.0, 3)}

    #{if result[:complexity], do: "**Complexity**: #{inspect(result[:complexity])}", else: ""}

    #{if result[:purity], do: "**Purity**: #{if result[:purity].pure?, do: "Pure", else: "Impure"}", else: ""}



    #{if include_code and result[:code] do

      """

      ```#{result[:language] || ""}

      #{result[:code]}

      ```

      """

    else

      result[:text] || result[:doc] || "No description available"

    end}

    """

  end



  defp truncate_if_needed(context, max_length) when byte_size(context) > max_length do

    truncated = String.slice(context, 0, max_length)

    truncated <> "\n\n... (context truncated)"

  end



  defp truncate_if_needed(context, _max_length), do: context

end