Template
96 lines
2.1 KiB
C++
96 lines
2.1 KiB
C++
#pragma once
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#include <ranges>
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#include <span>
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#include <string_view>
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namespace core {
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class command_line_argument
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{
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public:
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constexpr command_line_argument(char* arg, std::span<char*> modifiers)
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: m_arg_view{arg}
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, m_modifiers{modifiers}
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{
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}
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template<typename F>
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requires std::invocable<F>
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void with(std::string_view arg_to_match_view, F&& function) const
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{
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if (arg_to_match_view == m_arg_view)
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std::invoke(std::forward<F>(function));
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}
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private:
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std::string_view m_arg_view;
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std::span<char*> m_modifiers;
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};
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class command_line_args_view : public std::ranges::view_interface<command_line_args_view>
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{
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public:
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constexpr command_line_args_view() = default;
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constexpr command_line_args_view(int argc, char* argv[])
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: m_argc{--argc}
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, m_application_path{argv++[0]}
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, m_argv{argv}
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{
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}
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class iterator
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{
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public:
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constexpr iterator(int argc, char** argv, int index)
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: m_argv{argv}
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, m_argc{argc}
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, m_index{index}
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{
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}
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constexpr iterator& operator++()
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{
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++m_index;
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while (m_index < m_argc)
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{
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const std::string_view arg_view{m_argv[m_index]};
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if (arg_view.starts_with("--"))
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m_modifier_start_index = m_index++;
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}
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return *this;
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}
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constexpr command_line_argument operator*() const
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{
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if (m_modifier_start_index != -1)
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return command_line_argument{m_argv[m_index], std::span<char*>(&m_argv[m_modifier_start_index], &m_argv[m_index])};
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else
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return command_line_argument{m_argv[m_index], {}};
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}
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constexpr bool operator!=(const iterator& other) const { return m_argv != other.m_argv || m_index != other.m_index; }
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private:
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char** m_argv;
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int m_argc;
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int m_index;
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int m_modifier_start_index{-1};
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};
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constexpr auto&& appliation_path() const { return m_application_path; }
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constexpr iterator begin() const { return iterator{m_argc, m_argv, 0}; }
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constexpr iterator end() const { return iterator{m_argc, m_argv, m_argc}; }
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constexpr std::size_t size() const { return static_cast<std::size_t>(m_argc); }
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private:
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int m_argc{};
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char* m_application_path{};
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char** m_argv{};
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};
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}
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