💿🐜 Antkeeper source code
https://antkeeper.com
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132 lines
3.6 KiB
132 lines
3.6 KiB
/*
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* Copyright (C) 2020 Christopher J. Howard
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*
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* This file is part of Antkeeper source code.
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*
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* Antkeeper source code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Antkeeper source code is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef ANTKEEPER_CLI_HPP
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#define ANTKEEPER_CLI_HPP
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#include <functional>
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#include <map>
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#include <sstream>
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#include <string>
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#include <tuple>
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/**
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* Minimal command-line interpreter.
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*/
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class cli
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{
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public:
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/**
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* Interprets a command line as a function invocation.
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*
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* @param line Command line.
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* @return Stringified return value of the command function.
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*/
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std::string interpret(const std::string& line) const;
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/**
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* Registers a command with the CLI.
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*
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* @tparam T Command function return type.
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* @tparam Args Command function argument types.
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* @param name Command name.
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* @param function Command function.
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*/
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template <class T, class... Args>
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void register_command(const std::string& name, const std::function<T(Args...)>& function);
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/// @copydoc register_command(const std::string, const std::function<T(Args...)>&)
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template <class T, class... Args>
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void register_command(const std::string& name, T (*function)(Args...));
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/**
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* Unregisters a command from the CLI.
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*
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* @param name Command name.
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*/
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void unregister_command(const std::string& name);
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private:
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/// String-wrapped function object
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typedef std::function<std::string(const std::string&)> command_type;
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/**
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* Parses a single argument from a string stream.
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*
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* @param stream String stream from which an argument should be parsed.
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*/
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template <class T>
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static T parse(std::istringstream& stream);
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/**
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* Wraps a function in an interpreter function that parses strings as arguments then executes the wrapped function with the parsed arguments.
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*
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* @param function Function to wrap.
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* @return Wrapped function.
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*/
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template <class T, class... Args>
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static command_type wrap(const std::function<T(Args...)>& function);
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std::map<std::string, command_type> commands;
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};
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template <class T, class... Args>
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void cli::register_command(const std::string& name, const std::function<T(Args...)>& function)
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{
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commands[name] = wrap(function);
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}
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template <class T, class... Args>
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void cli::register_command(const std::string& name, T (*function)(Args...))
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{
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commands[name] = wrap(std::function(function));
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}
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template <class T>
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T cli::parse(std::istringstream& stream)
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{
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T value;
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stream >> value;
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return value;
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}
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template <class T, class... Args>
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typename cli::command_type cli::wrap(const std::function<T(Args...)>& function)
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{
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return std::bind(
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[function](const std::string& line) -> std::string
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{
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//std::size_t argument_count = sizeof...(Args);
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// Parse string into tuple of arguments
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std::istringstream istream(line);
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std::tuple<Args...> arguments{parse<Args>(istream)...};
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// Invoke function with arguments and save the result
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T result = std::apply(function, arguments);
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// Return function result as string
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std::ostringstream ostream;
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ostream << result;
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return ostream.str();
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},
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std::placeholders::_1);
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}
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#endif // ANTKEEPER_CLI_HPP
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