// Nyash-only Python parser using PyRuntimeBox (no Rust build)
static box PythonParserNy {
  parse(code) {
    local src
    if (code == null || code.toString() == "") {
      // Fallback: read from env via Python os.getenv
      local os, getenv
      local py = new PyRuntimeBox()
      os = py.import("os")
      getenv = os.getattr("getenv")
      src = getenv.call("NYASH_PY_CODE").toString()
    } else {
      src = code.toString()
    }

    // ast.dump(ast.parse(src))
    local ast, parsef, dumpf, tree, dump, dump_str
    local py2 = new PyRuntimeBox()
    ast = py2.import("ast")
    parsef = ast.getattr("parse")
    tree = parsef.call(src)
    dumpf = ast.getattr("dump")
    dump = dumpf.call(tree)
    dump_str = dump.str()

    // Minimal JSON (escape quotes minimally by replacing \" -> \\\" )
    // Note: for robust escaping, prefer Python json.dumps in a later pass
    local esc
    esc = dump_str.replace("\"", "\\\"")
    return new StringBox("{\"ast\":\"Module\",\"dump\":\"" + esc + "\"}")
  }
}