Method Evaluate

Source/cmGeneratorExpressionNode.cxx:454–483

  int NumExpectedParameters() const override { return 3; }

  std::string Evaluate(
    std::vector<std::string> const& parameters, cm::GenEx::Evaluation* eval,
    GeneratorExpressionContent const* content,
    cmGeneratorExpressionDAGChecker* /*dagChecker*/) const override
  {
    if (parameters.size() != 3) {
      reportError(eval, content->GetOriginalExpression(),
                  "$<FILTER:...> expression requires three parameters");
      return {};
    }

    if (parameters[1] != "INCLUDE" && parameters[1] != "EXCLUDE") {
      reportError(
        eval, content->GetOriginalExpression(),
        "$<FILTER:...> second parameter must be either INCLUDE or EXCLUDE");
      return {};
    }

    try {
      return cmList{ parameters.front(), cmList::EmptyElements::Yes }
        .filter(parameters[2],
                parameters[1] == "EXCLUDE" ? cmList::FilterMode::EXCLUDE
                                           : cmList::FilterMode::INCLUDE)
        .to_string();
    } catch (std::invalid_argument&) {
      reportError(eval, content->GetOriginalExpression(),
                  "$<FILTER:...> failed to compile regex");
      return {};
    }
  }
} filterNode;

static const struct RemoveDuplicatesNode : public cmGeneratorExpressionNode