C++ Option::error方法代码示例

// parser<unsigned long long> implementation
//
bool parser<unsigned long long>::parse(Option &O, StringRef ArgName,
                                      StringRef Arg, unsigned long long &Value){

  if (Arg.getAsInteger(0, Value))
    return O.error("'" + Arg + "' value invalid for uint argument!");
  return false;
}

// parser<double>/parser<float> implementation
//
static bool parseDouble(Option &O, const std::string &Arg, double &Value) {
  const char *ArgStart = Arg.c_str();
  char *End;
  Value = strtod(ArgStart, &End);
  if (*End != 0)
    return O.error(": '" +Arg+ "' value invalid for floating point argument!");
  return false;
}

// parser<int> implementation
//
bool parser<int>::parse(Option &O, const char *ArgName,
                        const std::string &Arg, int &Value) {
  char *End;
  Value = (int)strtol(Arg.c_str(), &End, 0);
  if (*End != 0)
    return O.error(": '" + Arg + "' value invalid for integer argument!");
  return false;
}

// parser<double>/parser<float> implementation
//
static bool parseDouble(Option &O, const string& Arg, double &Value) {
	try {
		Value = lexical_cast<double> (Arg);
	} catch (bad_lexical_cast &) {
		return O.error("'" + Arg
				+ "' value invalid for floating point argument!");
	}
	return false;
}

// parser<double>/parser<float> implementation
//
static bool parseDouble(Option &O, StringRef Arg, double &Value) {
  SmallString<32> TmpStr(Arg.begin(), Arg.end());
  const char *ArgStart = TmpStr.c_str();
  char *End;
  Value = strtod(ArgStart, &End);
  if (*End != 0)
    return O.error("'" + Arg + "' value invalid for floating point argument!");
  return false;
}

// parser<unsigned> implementation
//
bool parser<unsigned>::parse(Option &O, const string& ArgName,
		const string& Arg, unsigned &Value) {

	try {
		Value = lexical_cast<int> (Arg);
	} catch (bad_lexical_cast &) {
		return O.error("'" + Arg + "' value invalid for uint argument!");
	}
	return false;
}

// parser<unsigned> implementation
//
bool parser<unsigned>::parse(Option &O, const char *ArgName,
                             const std::string &Arg, unsigned &Value) {
  char *End;
  errno = 0;
  unsigned long V = strtoul(Arg.c_str(), &End, 0);
  Value = (unsigned)V;
  if (((V == ULONG_MAX) && (errno == ERANGE))
      || (*End != 0)
      || (Value != V))
    return O.error(": '" + Arg + "' value invalid for uint argument!");
  return false;
}

// parser<bool> implementation
//
bool parser<bool>::parse(Option &O, const char *ArgName,
                         const std::string &Arg, bool &Value) {
  if (Arg == "" || Arg == "true" || Arg == "TRUE" || Arg == "True" ||
      Arg == "1") {
    Value = true;
  } else if (Arg == "false" || Arg == "FALSE" || Arg == "False" || Arg == "0") {
    Value = false;
  } else {
    return O.error(": '" + Arg +
                   "' is invalid value for boolean argument! Try 0 or 1");
  }
  return false;
}

 /// Return true on error.
 bool parse(Option &O, StringRef ArgName, StringRef Arg, OffsetOption &Val) {
   if (Arg == "") {
     Val.Val = 0;
     Val.HasValue = false;
     Val.IsRequested = true;
     return false;
   }
   if (Arg.getAsInteger(0, Val.Val))
     return O.error("'" + Arg + "' value invalid for integer argument!");
   Val.HasValue = true;
   Val.IsRequested = true;
   return false;
 }

// parser<boolOrDefault> implementation
//
bool parser<boolOrDefault>::parse(Option &O, const string& ArgName,
                                  const string& Arg, boolOrDefault &Value) {
  if (Arg == "" || Arg == "true" || Arg == "TRUE" || Arg == "True" ||
      Arg == "1") {
    Value = BOU_TRUE;
    return false;
  }
  if (Arg == "false" || Arg == "FALSE" || Arg == "False" || Arg == "0") {
    Value = BOU_FALSE;
    return false;
  }

  return O.error("'" + Arg +
                 "' is invalid value for boolean argument! Try 0 or 1");
}

/// GetOptionInfo - Scan the list of registered options, turning them into data
/// structures that are easier to handle.
static void GetOptionInfo(std::vector<Option*> &PositionalOpts,
                          std::vector<Option*> &SinkOpts,
                          std::map<std::string, Option*> &OptionsMap) {
  std::vector<const char*> OptionNames;
  Option *CAOpt = 0;  // The ConsumeAfter option if it exists.
  for (Option *O = RegisteredOptionList; O; O = O->getNextRegisteredOption()) {
    // If this option wants to handle multiple option names, get the full set.
    // This handles enum options like "-O1 -O2" etc.
    O->getExtraOptionNames(OptionNames);
    if (O->ArgStr[0])
      OptionNames.push_back(O->ArgStr);

    // Handle named options.
    for (size_t i = 0, e = OptionNames.size(); i != e; ++i) {
      // Add argument to the argument map!
      if (!OptionsMap.insert(std::pair<std::string,Option*>(OptionNames[i],
                                                            O)).second) {
        cerr << ProgramName << ": CommandLine Error: Argument '"
             << OptionNames[i] << "' defined more than once!\n";
      }
    }

    OptionNames.clear();

    // Remember information about positional options.
    if (O->getFormattingFlag() == cl::Positional)
      PositionalOpts.push_back(O);
    else if (O->getMiscFlags() & cl::Sink) // Remember sink options
      SinkOpts.push_back(O);
    else if (O->getNumOccurrencesFlag() == cl::ConsumeAfter) {
      if (CAOpt)
        O->error("Cannot specify more than one option with cl::ConsumeAfter!");
      CAOpt = O;
    }
  }

  if (CAOpt)
    PositionalOpts.push_back(CAOpt);

  // Make sure that they are in order of registration not backwards.
  std::reverse(PositionalOpts.begin(), PositionalOpts.end());
}

void cl::ParseCommandLineOptions(int argc, char **argv,
                                 const char *Overview, bool ReadResponseFiles) {
  // Process all registered options.
  std::vector<Option*> PositionalOpts;
  std::vector<Option*> SinkOpts;
  std::map<std::string, Option*> Opts;
  GetOptionInfo(PositionalOpts, SinkOpts, Opts);

  assert((!Opts.empty() || !PositionalOpts.empty()) &&
         "No options specified!");

  // Expand response files.
  std::vector<char*> newArgv;
  if (ReadResponseFiles) {
    newArgv.push_back(strdup(argv[0]));
    ExpandResponseFiles(argc, argv, newArgv);
    argv = &newArgv[0];
    argc = static_cast<int>(newArgv.size());
  }

  // Copy the program name into ProgName, making sure not to overflow it.
  std::string ProgName = sys::Path(argv[0]).getLast();
  if (ProgName.size() > 79) ProgName.resize(79);
  strcpy(ProgramName, ProgName.c_str());

  ProgramOverview = Overview;
  bool ErrorParsing = false;

  // Check out the positional arguments to collect information about them.
  unsigned NumPositionalRequired = 0;

  // Determine whether or not there are an unlimited number of positionals
  bool HasUnlimitedPositionals = false;

  Option *ConsumeAfterOpt = 0;
  if (!PositionalOpts.empty()) {
    if (PositionalOpts[0]->getNumOccurrencesFlag() == cl::ConsumeAfter) {
      assert(PositionalOpts.size() > 1 &&
             "Cannot specify cl::ConsumeAfter without a positional argument!");
      ConsumeAfterOpt = PositionalOpts[0];
    }

    // Calculate how many positional values are _required_.
    bool UnboundedFound = false;
    for (size_t i = ConsumeAfterOpt != 0, e = PositionalOpts.size();
         i != e; ++i) {
      Option *Opt = PositionalOpts[i];
      if (RequiresValue(Opt))
        ++NumPositionalRequired;
      else if (ConsumeAfterOpt) {
        // ConsumeAfter cannot be combined with "optional" positional options
        // unless there is only one positional argument...
        if (PositionalOpts.size() > 2)
          ErrorParsing |=
            Opt->error(" error - this positional option will never be matched, "
                       "because it does not Require a value, and a "
                       "cl::ConsumeAfter option is active!");
      } else if (UnboundedFound && !Opt->ArgStr[0]) {
        // This option does not "require" a value...  Make sure this option is
        // not specified after an option that eats all extra arguments, or this
        // one will never get any!
        //
        ErrorParsing |= Opt->error(" error - option can never match, because "
                                   "another positional argument will match an "
                                   "unbounded number of values, and this option"
                                   " does not require a value!");
      }
      UnboundedFound |= EatsUnboundedNumberOfValues(Opt);
    }
    HasUnlimitedPositionals = UnboundedFound || ConsumeAfterOpt;
  }

  // PositionalVals - A vector of "positional" arguments we accumulate into
  // the process at the end...
  //
  std::vector<std::pair<std::string,unsigned> > PositionalVals;

  // If the program has named positional arguments, and the name has been run
  // across, keep track of which positional argument was named.  Otherwise put
  // the positional args into the PositionalVals list...
  Option *ActivePositionalArg = 0;

  // Loop over all of the arguments... processing them.
  bool DashDashFound = false;  // Have we read '--'?
  for (int i = 1; i < argc; ++i) {
    Option *Handler = 0;
    const char *Value = 0;
    const char *ArgName = "";

    // If the option list changed, this means that some command line
    // option has just been registered or deregistered.  This can occur in
    // response to things like -load, etc.  If this happens, rescan the options.
    if (OptionListChanged) {
      PositionalOpts.clear();
      SinkOpts.clear();
      Opts.clear();
      GetOptionInfo(PositionalOpts, SinkOpts, Opts);
      OptionListChanged = false;
    }

//.........这里部分代码省略.........