bool index()

in glean/lang/clang/index.cpp [355:415]
53 lines of code
17 McCabe index (conditional complexity)

  bool index(const SourceFile& source) {
    auto pcdb = cdb.load(source);
    ClangCfg cfg{
      ClangDB::Env{
        locatorOf(source),
        platformOf(source),
        config.root,
        config.target_subdir,
        config.path_prefix,
        batch,
      },
      config.diagnostics.get()
    };
    FrontendActionFactory factory(&cfg);
    clang::tooling::ClangTool tool(*pcdb, source.file);
    if (!FLAGS_clang_arguments.empty()) {
      clang::tooling::CommandLineArguments args;
      folly::split(" ", FLAGS_clang_arguments, args, true);
      if (!args.empty()) {
        tool.appendArgumentsAdjuster(
          clang::tooling::getInsertArgumentAdjuster(
            args, clang::tooling::ArgumentInsertPosition::END));
      }
    }
    tool.appendArgumentsAdjuster([](const auto& args, auto) {
      clang::tooling::CommandLineArguments stripped;
      stripped.reserve(args.size());
      for (size_t i = 0; i < args.size(); ++i) {
        if (FLAGS_clang_no_pch && args[i] == "-include-pch") {
          ++i;  // skip next argument
        } else if (FLAGS_clang_no_pch
                   && args[i] == "-include"
                   && i+1 < args.size()
                   && boost::ends_with(args[i+1],".pch")) {
          // headers included from the command line cause problems
          // because they won't be visible to tools exploring the
          // include graph via the cxx.Trace predicate. When used to
          // include a .pch file these are typically a compile-time
          // optimisation only, so we strip them out when
          // --clang_no_pch is on.
          ++i;
        } else if (!FLAGS_clang_resource_dir.empty()
                    && args[i] == "-resource-dir") {
          ++i;  // replace -resource-dir flag
          stripped.push_back("-resource-dir");
          stripped.push_back(FLAGS_clang_resource_dir);
        } else if (boost::starts_with(args[i], "--cc=")) {
          // skip this flag - llvm complains about it
        } else if (FLAGS_clang_no_modules &&
                   (args[i] == "-fmodules"
                    || args[i] == "-fcxx-modules"
                    || boost::starts_with(args[i], "-fmodule-name="))) {
          // skip these
        } else {
          stripped.push_back(args[i]);
        }
      }
      return stripped;
    });
    return tool.run(&factory) == 0;
  }