Function stripExportInterface

Source/cmGeneratorExpression.cxx:249–341

}

static std::string stripExportInterface(
  cm::string_view input, cmGeneratorExpression::PreprocessContext context,
  cm::string_view importPrefix)
{
  std::string result;

  int nestingLevel = 0;
  std::string::size_type pos = 0;
  std::string::size_type lastPos = pos;
  while (true) {
    std::string::size_type bPos = input.find("$<BUILD_INTERFACE:", lastPos);
    std::string::size_type iPos = input.find("$<INSTALL_INTERFACE:", lastPos);
    std::string::size_type lPos =
      input.find("$<BUILD_LOCAL_INTERFACE:", lastPos);

    pos = std::min({ bPos, iPos, lPos });
    if (pos == std::string::npos) {
      break;
    }

    result += input.substr(lastPos, pos - lastPos);
    enum class FoundGenex
    {
      BuildInterface,
      InstallInterface,
      BuildLocalInterface,
    } foundGenex = FoundGenex::BuildInterface;
    if (pos == bPos) {
      foundGenex = FoundGenex::BuildInterface;
      pos += cmStrLen("$<BUILD_INTERFACE:");
    } else if (pos == iPos) {
      foundGenex = FoundGenex::InstallInterface;
      pos += cmStrLen("$<INSTALL_INTERFACE:");
    } else if (pos == lPos) {
      foundGenex = FoundGenex::BuildLocalInterface;
      pos += cmStrLen("$<BUILD_LOCAL_INTERFACE:");
    } else {
      assert(false && "Invalid position found");
    }
    nestingLevel = 1;
    char const* c = input.data() + pos;
    char const* const cStart = c;
    for (; *c; ++c) {
      if (cmGeneratorExpression::StartsWithGeneratorExpression(c)) {
        ++nestingLevel;
        ++c;
        continue;
      }
      if (c[0] == '>') {
        --nestingLevel;
        if (nestingLevel != 0) {
          continue;
        }
        if (context == cmGeneratorExpression::BuildInterface &&
            foundGenex == FoundGenex::BuildInterface) {
          result += input.substr(pos, c - cStart);
        } else if (context == cmGeneratorExpression::InstallInterface &&
                   foundGenex == FoundGenex::InstallInterface) {