scsl/Flag.cc

192 lines
3.4 KiB
C++

///
/// \file Flag.h
/// \author kyle
/// \created 2023-10-12
/// \brief Flag defines a command-line flag parser.
///
/// \section COPYRIGHT
///
/// Copyright 2023 K. Isom <kyle@imap.cc>
///
/// Permission to use, copy, modify, and/or distribute this software for
/// any purpose with or without fee is hereby granted, provided that
/// the above copyright notice and this permission notice appear in all /// copies.
///
/// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
/// WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
/// WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
/// AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
/// DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA
/// OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
/// TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
/// PERFORMANCE OF THIS SOFTWARE.
///
#include <cstdint>
#include <functional>
#include <map>
#include <regex>
#include <vector>
#include "Flag.h"
namespace klib {
static const std::regex isFlag("^-[a-zA-Z0-9]+$",
std::regex_constants::nosubs);
Flag::Flag(FlagType fType, std::string fName, std::string fDescription)
: Type(fType), WasSet(false), Name(fName), Description(fDescription)
{
}
Flags::Flags(std::string fName)
: name(fName), description("")
{
}
Flags::Flags(std::string fName, std::string fDescription)
: name(fName), description(fDescription)
{
}
bool
Flags::Register(std::string fName, FlagType fType, std::string fDescription)
{
if (!std::regex_search(fName, isFlag)) {
return false;
}
if (this->flags.count(fName) != 0) {
return false;
}
auto flag = new Flag;
flag->Type = fType;
flag->WasSet = false;
flag->name = name;
this->desription = fDescription;
this->flags[fName] = flag;
return true;
}
Flag *
Flags::Lookup(std::string fName)
{
if (this->flags.count(fName) == 0) {
return nullptr;
}
}
OptFlagValue
Flags::ValueOf(std::string fName)
{
if (this->flags.count(fName)) {
return std::nullopt;
}
return OptFlagValue(this->flags[fName]->Value);
}
ParseStatus
Flags::parseArg(int argc, char **argv, int &index)
{
std::string arg(argv[index]);
index++;
if (!std::regex_search(arg, isFlag)) {
return ParseStatus::EndOfFlags;
}
if (this->flags.count(arg) == 0) {
return ParseStatus::NotRegistered;
}
auto flag = flags[arg];
if (flag->Type == FlagType::Boolean) {
flag->WasSet = true;
flag->Value.b = true;
return ParseStatus::OK;
}
switch (flag->Type) {
default:
throw std::runtime_error("not handled");
}
return ParseStatus::OK;
}
ParseStatus
Flags::Parse(int argc, char **argv)
{
int index = 1;
while (index != argc) {
auto result = this->parseArg(argc, argv, index);
switch (result) {
case ParseStatus::OK:
continue;
case ParseStatus::EndOfFlags:
while (index < argc) {
this->args.push_back(std::string(argv[index]));
index++;
}
continue;
case ParseStatus::EndOfFlags:
case ParseStatus::NotEnoughArgs:
// fall through //
return result;
default:
throw runtime_error("unhandled parse state");
}
}
return ParseStatus::OK;
}
size_t
Flags::NumArgs()
{
return this->args.size();
}
std::vector<std::string>
Flags::Args()
{
return this->args;
}
bool
Flags::GetBool(std::string name, bool &flagValue)
{
if (this->flags[name] == 0) {
return false;
}
return std::get<bool>(this->flags[name]->Value);
}
} // namespace klib