Function EvaluateSplitConfigGenex

Source/cmCustomCommandGenerator.cxx:30–105

namespace {
std::string EvaluateSplitConfigGenex(
  cm::string_view input, cmGeneratorExpression const& ge, cmLocalGenerator* lg,
  bool useOutputConfig, std::string const& outputConfig,
  std::string const& commandConfig, cmGeneratorTarget const* target,
  std::set<BT<std::pair<std::string, bool>>>* utils = nullptr)
{
  std::string result;

  while (!input.empty()) {
    // Copy non-genex content directly to the result.
    std::string::size_type pos = input.find("$<");
    result += input.substr(0, pos);
    if (pos == std::string::npos) {
      break;
    }
    input = input.substr(pos);

    // Find the balanced end of this regex.
    size_t nestingLevel = 1;
    for (pos = 2; pos < input.size(); ++pos) {
      cm::string_view cur = input.substr(pos);
      if (cmHasLiteralPrefix(cur, "$<")) {
        ++nestingLevel;
        ++pos;
        continue;
      }
      if (cmHasPrefix(cur, '>')) {
        --nestingLevel;
        if (nestingLevel == 0) {
          ++pos;
          break;
        }
      }
    }

    // Split this genex from following input.
    cm::string_view genex = input.substr(0, pos);
    input = input.substr(pos);

    // Convert an outer COMMAND_CONFIG or OUTPUT_CONFIG to the matching config.
    std::string const* config =
      useOutputConfig ? &outputConfig : &commandConfig;
    if (nestingLevel == 0) {
      static cm::string_view const COMMAND_CONFIG = "$<COMMAND_CONFIG:"_s;
      static cm::string_view const OUTPUT_CONFIG = "$<OUTPUT_CONFIG:"_s;
      if (cmHasPrefix(genex, COMMAND_CONFIG)) {
        genex.remove_prefix(COMMAND_CONFIG.size());
        genex.remove_suffix(1);
        useOutputConfig = false;
        config = &commandConfig;
      } else if (cmHasPrefix(genex, OUTPUT_CONFIG)) {
        genex.remove_prefix(OUTPUT_CONFIG.size());
        genex.remove_suffix(1);
        useOutputConfig = true;
        config = &outputConfig;
      }
    }