Metastatic is a library that provides a unified MetaAST (Meta-level Abstract Syntax Tree) intermediate representation for parsing, transforming, and analyzing code across multiple programming languages using a three-layer meta-model architecture.

“Build tools once, apply them everywhere,” they Java-evangelists said. I tried my own path to create a universal meta-model for program syntax that enables cross-language code analysis, transformation, and tooling.

Metastatic provides the foundation for that—the MetaAST meta-model and language adapters. Tools that leverage this foundation (mutation testing, purity analysis, complexity metrics) are built separately.

It’s already used in Ragex v0.19.0 — Documentation , https://cure-lang.org, and some WIP pets.

Now it’s probably a good time to release it to the wild.

iex|🌢|1 ▶ Metastatic.quote("defmodule M, do: def forty_two, do: 42", :elixir)

{:ok,
 {:container,
  [container_type: :module, name: "M", module: "M", language: :elixir, line: 1],
  [
    {:function_def,
     [
       name: "forty_two",
       params: [],
       visibility: :public,
       arity: 0,
       function: "forty_two",
       language: :elixir,
       line: 1
     ], [{:literal, [subtype: :integer], 42}]}
  ]}}

▸ Metastatic v0.23.0 — Documentation

https://github.com/oeditus/metastatic