82 lines
2.5 KiB
C++
82 lines
2.5 KiB
C++
/**
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roflcat
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Copyright (C) 2019 rexy712
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This program 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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This program 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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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef PRINTER_BASE_HPP
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#define PRINTER_BASE_HPP
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#include "cmd.hpp"
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#include <type_traits> //std::is_same
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#include <utility> //std::declval
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#define SHOW_TABS_STRING L"^I"
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#define LINE_NUMBERING_SPACE STRINGIFY(8)
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#define REAL_STRINGIFY(x) #x
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#define STRINGIFY(x) REAL_STRINGIFY(x)
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//name of struct generated by OPTIONAL_MEMBER_FUNC for given x
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#define HAS_FUNC(x) _determine_has_member_func_##x
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//generate utility struct to determine if a given class has a member function
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#define OPTIONAL_MEMBER_FUNC(x) \
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template<class U, class Ret = void, class... Args> \
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struct HAS_FUNC(x){ \
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private: \
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template<class T, Ret& (T::*)(Args...)> \
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struct check_s{}; \
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template<class T> \
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static char test(check_s<T, &T::x>*); \
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template<class T> \
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static int test(...); \
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public: \
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static constexpr bool value = std::is_same<char,decltype(test<U>(nullptr))>::value; \
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}
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//Defines an interface for the base classes
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//require a _print and an optional _reset function
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template<class Derived>
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class printer_base
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{
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private:
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OPTIONAL_MEMBER_FUNC(_reset);
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private:
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const bool m_show_ends = false;
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const int m_print_ln = PRINT_LINE_NEVER;
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const bool m_squeeze_blank = false;
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int m_squeeze_cnt = 0;
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bool m_newline = true;
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int m_line_num = 1;
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const wchar_t* const m_tab_str = L"\t";
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const size_t m_tab_size = 1;
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protected:
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constexpr printer_base(void)noexcept = default;
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constexpr printer_base(const wchar_t* tabstr, const cmd_args& args)noexcept;
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~printer_base(void)noexcept = default;
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public:
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constexpr Derived& print(wchar_t s)noexcept(noexcept(std::declval<Derived>()._print(s)));
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constexpr Derived& print(const wchar_t* s)noexcept(noexcept(std::declval<printer_base<Derived>>().print(std::declval<wchar_t>())));
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constexpr Derived& print(char s);
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constexpr Derived& print(const char* s);
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constexpr Derived& reset(void);
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};
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#endif
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