Evgeny Mankov
495 строки
15 KiB
C++
495 строки
15 KiB
C++
// The MIT License (MIT)
|
|
//
|
|
// Copyright (c) 2015 - 2016 Florian Rappl
|
|
//
|
|
// Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
// of this software and associated documentation files (the "Software"), to deal
|
|
// in the Software without restriction, including without limitation the rights
|
|
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
// copies of the Software, and to permit persons to whom the Software is
|
|
// furnished to do so, subject to the following conditions:
|
|
//
|
|
// The above copyright notice and this permission notice shall be included in all
|
|
// copies or substantial portions of the Software.
|
|
//
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
// SOFTWARE.
|
|
|
|
/*
|
|
This file is part of the C++ CmdParser utility.
|
|
Copyright (c) 2015 - 2016 Florian Rappl
|
|
*/
|
|
|
|
#pragma once
|
|
#include <iostream>
|
|
#include <stdexcept>
|
|
#include <string>
|
|
#include <vector>
|
|
#include <sstream>
|
|
#include <functional>
|
|
|
|
namespace cli {
|
|
struct CallbackArgs {
|
|
const std::vector<std::string>& arguments;
|
|
std::ostream& output;
|
|
std::ostream& error;
|
|
};
|
|
class Parser {
|
|
private:
|
|
class CmdBase {
|
|
public:
|
|
explicit CmdBase(const std::string& name, const std::string& alternative,
|
|
const std::string& description, bool required, bool dominant,
|
|
bool variadic)
|
|
: name(name),
|
|
command(name.size() > 0 ? "-" + name : ""),
|
|
alternative(alternative.size() > 0 ? "--" + alternative : ""),
|
|
description(description),
|
|
required(required),
|
|
handled(false),
|
|
arguments({}),
|
|
dominant(dominant),
|
|
variadic(variadic) {}
|
|
|
|
virtual ~CmdBase() {}
|
|
|
|
std::string name;
|
|
std::string command;
|
|
std::string alternative;
|
|
std::string description;
|
|
bool required;
|
|
bool handled;
|
|
std::vector<std::string> arguments;
|
|
bool const dominant;
|
|
bool const variadic;
|
|
|
|
virtual std::string print_value() const = 0;
|
|
virtual bool parse(std::ostream& output, std::ostream& error) = 0;
|
|
|
|
bool is(const std::string& given) const { return given == command || given == alternative; }
|
|
};
|
|
|
|
template <typename T>
|
|
struct ArgumentCountChecker {
|
|
static constexpr bool Variadic = false;
|
|
};
|
|
|
|
template <typename T>
|
|
struct ArgumentCountChecker<std::vector<T>> {
|
|
static constexpr bool Variadic = true;
|
|
};
|
|
|
|
template <typename T>
|
|
class CmdFunction final : public CmdBase {
|
|
public:
|
|
explicit CmdFunction(const std::string& name, const std::string& alternative,
|
|
const std::string& description, bool required, bool dominant)
|
|
: CmdBase(name, alternative, description, required, dominant,
|
|
ArgumentCountChecker<T>::Variadic) {}
|
|
|
|
virtual bool parse(std::ostream& output, std::ostream& error) {
|
|
try {
|
|
CallbackArgs args{arguments, output, error};
|
|
value = callback(args);
|
|
return true;
|
|
} catch (...) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
virtual std::string print_value() const { return ""; }
|
|
|
|
std::function<T(CallbackArgs&)> callback;
|
|
T value;
|
|
};
|
|
|
|
template <typename T>
|
|
class CmdArgument final : public CmdBase {
|
|
public:
|
|
explicit CmdArgument(const std::string& name, const std::string& alternative,
|
|
const std::string& description, bool required, bool dominant)
|
|
: CmdBase(name, alternative, description, required, dominant,
|
|
ArgumentCountChecker<T>::Variadic) {}
|
|
|
|
virtual bool parse(std::ostream&, std::ostream&) {
|
|
try {
|
|
value = Parser::parse(arguments, value);
|
|
return true;
|
|
} catch (...) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
virtual std::string print_value() const { return stringify(value); }
|
|
|
|
T value;
|
|
};
|
|
|
|
static int parse(const std::vector<std::string>& elements, const int&) {
|
|
if (elements.size() != 1) throw std::bad_cast();
|
|
|
|
return std::stoi(elements[0]);
|
|
}
|
|
|
|
static bool parse(const std::vector<std::string>& elements, const bool& defval) {
|
|
if (elements.size() != 0)
|
|
throw std::runtime_error("A boolean command line parameter cannot have any arguments.");
|
|
|
|
return !defval;
|
|
}
|
|
|
|
static double parse(const std::vector<std::string>& elements, const double&) {
|
|
if (elements.size() != 1) throw std::bad_cast();
|
|
|
|
return std::stod(elements[0]);
|
|
}
|
|
|
|
static float parse(const std::vector<std::string>& elements, const float&) {
|
|
if (elements.size() != 1) throw std::bad_cast();
|
|
|
|
return std::stof(elements[0]);
|
|
}
|
|
|
|
static long double parse(const std::vector<std::string>& elements, const long double&) {
|
|
if (elements.size() != 1) throw std::bad_cast();
|
|
|
|
return std::stold(elements[0]);
|
|
}
|
|
|
|
static unsigned int parse(const std::vector<std::string>& elements, const unsigned int&) {
|
|
if (elements.size() != 1) throw std::bad_cast();
|
|
|
|
return static_cast<unsigned int>(std::stoul(elements[0]));
|
|
}
|
|
|
|
static unsigned long parse(const std::vector<std::string>& elements, const unsigned long&) {
|
|
if (elements.size() != 1) throw std::bad_cast();
|
|
|
|
return std::stoul(elements[0]);
|
|
}
|
|
|
|
static unsigned long long parse(const std::vector<std::string>& elements,
|
|
const unsigned long long&) {
|
|
if (elements.size() != 1) throw std::bad_cast();
|
|
|
|
return std::stoull(elements[0]);
|
|
}
|
|
|
|
static long parse(const std::vector<std::string>& elements, const long&) {
|
|
if (elements.size() != 1) throw std::bad_cast();
|
|
|
|
return std::stol(elements[0]);
|
|
}
|
|
|
|
static std::string parse(const std::vector<std::string>& elements, const std::string&) {
|
|
if (elements.size() != 1) throw std::bad_cast();
|
|
|
|
return elements[0];
|
|
}
|
|
|
|
template <class T>
|
|
static std::vector<T> parse(const std::vector<std::string>& elements, const std::vector<T>&) {
|
|
const T defval = T();
|
|
std::vector<T> values{};
|
|
std::vector<std::string> buffer(1);
|
|
|
|
for (const auto& element : elements) {
|
|
buffer[0] = element;
|
|
values.push_back(parse(buffer, defval));
|
|
}
|
|
|
|
return values;
|
|
}
|
|
|
|
template <class T>
|
|
static std::string stringify(const T& value) {
|
|
return std::to_string(value);
|
|
}
|
|
|
|
template <class T>
|
|
static std::string stringify(const std::vector<T>& values) {
|
|
std::stringstream ss{};
|
|
ss << "[ ";
|
|
|
|
for (const auto& value : values) {
|
|
ss << stringify(value) << " ";
|
|
}
|
|
|
|
ss << "]";
|
|
return ss.str();
|
|
}
|
|
|
|
static std::string stringify(const std::string& str) { return str; }
|
|
|
|
public:
|
|
explicit Parser(int argc, const char** argv) : _appname(argv[0]) {
|
|
for (int i = 1; i < argc; ++i) {
|
|
_arguments.push_back(argv[i]);
|
|
}
|
|
enable_help();
|
|
}
|
|
|
|
explicit Parser(int argc, char** argv) : _appname(argv[0]) {
|
|
for (int i = 1; i < argc; ++i) {
|
|
_arguments.push_back(argv[i]);
|
|
}
|
|
enable_help();
|
|
}
|
|
|
|
~Parser() {
|
|
for (int i = 0, n = _commands.size(); i < n; ++i) {
|
|
delete _commands[i];
|
|
}
|
|
}
|
|
|
|
bool has_help() const {
|
|
for (const auto command : _commands) {
|
|
if (command->name == "h" && command->alternative == "--help") {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
void enable_help() {
|
|
set_callback("h", "help", std::function<bool(CallbackArgs&)>([this](CallbackArgs& args) {
|
|
args.output << this->usage();
|
|
exit(0);
|
|
return false;
|
|
}),
|
|
"", true);
|
|
}
|
|
|
|
void disable_help() {
|
|
for (auto command = _commands.begin(); command != _commands.end(); ++command) {
|
|
if ((*command)->name == "h" && (*command)->alternative == "--help") {
|
|
_commands.erase(command);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
template <typename T>
|
|
void set_default(bool is_required, const std::string& description = "") {
|
|
auto command = new CmdArgument<T>{"", "", description, is_required, false};
|
|
_commands.push_back(command);
|
|
}
|
|
|
|
template <typename T>
|
|
void set_required(const std::string& name, const std::string& alternative,
|
|
const std::string& description = "", bool dominant = false) {
|
|
auto command = new CmdArgument<T>{name, alternative, description, true, dominant};
|
|
_commands.push_back(command);
|
|
}
|
|
|
|
template <typename T>
|
|
void set_optional(const std::string& name, const std::string& alternative, T defaultValue,
|
|
const std::string& description = "", bool dominant = false) {
|
|
auto command = new CmdArgument<T>{name, alternative, description, false, dominant};
|
|
command->value = defaultValue;
|
|
_commands.push_back(command);
|
|
}
|
|
|
|
template <typename T>
|
|
void set_callback(const std::string& name, const std::string& alternative,
|
|
std::function<T(CallbackArgs&)> callback, const std::string& description = "",
|
|
bool dominant = false) {
|
|
auto command = new CmdFunction<T>{name, alternative, description, false, dominant};
|
|
command->callback = callback;
|
|
_commands.push_back(command);
|
|
}
|
|
|
|
inline void run_and_exit_if_error() {
|
|
if (run() == false) {
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
inline bool run() { return run(std::cout, std::cerr); }
|
|
|
|
inline bool run(std::ostream& output) { return run(output, std::cerr); }
|
|
|
|
bool run(std::ostream& output, std::ostream& error) {
|
|
if (_arguments.size() > 0) {
|
|
auto current = find_default();
|
|
|
|
for (int i = 0, n = _arguments.size(); i < n; ++i) {
|
|
auto isarg = _arguments[i].size() > 0 && _arguments[i][0] == '-';
|
|
auto associated = isarg ? find(_arguments[i]) : nullptr;
|
|
|
|
if (associated != nullptr) {
|
|
current = associated;
|
|
associated->handled = true;
|
|
} else if (current == nullptr) {
|
|
error << no_default();
|
|
return false;
|
|
} else {
|
|
current->arguments.push_back(_arguments[i]);
|
|
current->handled = true;
|
|
if (!current->variadic) {
|
|
// If the current command is not variadic, then no more arguments
|
|
// should be added to it. In this case, switch back to the default
|
|
// command.
|
|
current = find_default();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// First, parse dominant arguments since they succeed even if required
|
|
// arguments are missing.
|
|
for (auto command : _commands) {
|
|
if (command->handled && command->dominant && !command->parse(output, error)) {
|
|
error << howto_use(command);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
// Next, check for any missing arguments.
|
|
for (auto command : _commands) {
|
|
if (command->required && !command->handled) {
|
|
error << howto_required(command);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
// Finally, parse all remaining arguments.
|
|
for (auto command : _commands) {
|
|
if (command->handled && !command->dominant && !command->parse(output, error)) {
|
|
error << howto_use(command);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
template <typename T>
|
|
T get(const std::string& name) const {
|
|
for (const auto& command : _commands) {
|
|
if (command->name == name) {
|
|
auto cmd = dynamic_cast<CmdArgument<T>*>(command);
|
|
|
|
if (cmd == nullptr) {
|
|
throw std::runtime_error("Invalid usage of the parameter " + name +
|
|
" detected.");
|
|
}
|
|
|
|
return cmd->value;
|
|
}
|
|
}
|
|
|
|
throw std::runtime_error("The parameter " + name + " could not be found.");
|
|
}
|
|
|
|
template <typename T>
|
|
T get_if(const std::string& name, std::function<T(T)> callback) const {
|
|
auto value = get<T>(name);
|
|
return callback(value);
|
|
}
|
|
|
|
int requirements() const {
|
|
int count = 0;
|
|
|
|
for (const auto& command : _commands) {
|
|
if (command->required) {
|
|
++count;
|
|
}
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
int commands() const { return static_cast<int>(_commands.size()); }
|
|
|
|
inline const std::string& app_name() const { return _appname; }
|
|
|
|
protected:
|
|
CmdBase* find(const std::string& name) {
|
|
for (auto command : _commands) {
|
|
if (command->is(name)) {
|
|
return command;
|
|
}
|
|
}
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
CmdBase* find_default() {
|
|
for (auto command : _commands) {
|
|
if (command->name == "") {
|
|
return command;
|
|
}
|
|
}
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
std::string usage() const {
|
|
std::stringstream ss{};
|
|
ss << "Available parameters:\n\n";
|
|
|
|
for (const auto& command : _commands) {
|
|
ss << " " << command->command << "\t" << command->alternative;
|
|
|
|
if (command->required == true) {
|
|
ss << "\t(required)";
|
|
}
|
|
|
|
ss << "\n " << command->description;
|
|
|
|
if (command->required == false) {
|
|
ss << "\n "
|
|
<< "This parameter is optional. The default value is '" + command->print_value()
|
|
<< "'.";
|
|
}
|
|
|
|
ss << "\n\n";
|
|
}
|
|
|
|
return ss.str();
|
|
}
|
|
|
|
void print_help(std::stringstream& ss) const {
|
|
if (has_help()) {
|
|
ss << "For more help use --help or -h.\n";
|
|
}
|
|
}
|
|
|
|
std::string howto_required(CmdBase* command) const {
|
|
std::stringstream ss{};
|
|
ss << "The parameter " << command->name << " is required.\n";
|
|
ss << command->description << '\n';
|
|
print_help(ss);
|
|
return ss.str();
|
|
}
|
|
|
|
std::string howto_use(CmdBase* command) const {
|
|
std::stringstream ss{};
|
|
ss << "The parameter " << command->name << " has invalid arguments.\n";
|
|
ss << command->description << '\n';
|
|
print_help(ss);
|
|
return ss.str();
|
|
}
|
|
|
|
std::string no_default() const {
|
|
std::stringstream ss{};
|
|
ss << "No default parameter has been specified.\n";
|
|
ss << "The given argument must be used with a parameter.\n";
|
|
print_help(ss);
|
|
return ss.str();
|
|
}
|
|
|
|
private:
|
|
const std::string _appname;
|
|
std::vector<std::string> _arguments;
|
|
std::vector<CmdBase*> _commands;
|
|
};
|
|
} // namespace cli
|