Line data    Source code

       1             : /**
       2             : Copyright (c) 2016-2022 Roman Katuntsev <sbkarr@stappler.org>
       3             : Copyright (c) 2023 Stappler LLC <admin@stappler.dev>
       4             : 
       5             : Permission is hereby granted, free of charge, to any person obtaining a copy
       6             : of this software and associated documentation files (the "Software"), to deal
       7             : in the Software without restriction, including without limitation the rights
       8             : to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
       9             : copies of the Software, and to permit persons to whom the Software is
      10             : furnished to do so, subject to the following conditions:
      11             : 
      12             : The above copyright notice and this permission notice shall be included in
      13             : all copies or substantial portions of the Software.
      14             : 
      15             : THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
      16             : IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
      17             : FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
      18             : AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
      19             : LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
      20             : OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
      21             : THE SOFTWARE.
      22             : **/
      23             : 
      24             : #ifndef STAPPLER_COMMON_STRING_SPMETASTRING_H_
      25             : #define STAPPLER_COMMON_STRING_SPMETASTRING_H_
      26             : 
      27             : #include "SPStringView.h"
      28             : 
      29             : namespace STAPPLER_VERSIONIZED stappler::metastring {
      30             : 
      31             : template <char... Chars>
      32             : struct metastring {
      33             :         template <typename Interface>
      34             :         static constexpr auto string() -> typename Interface::StringType { return { Chars ... }; }
      35             :         static std::string std_string() { return { Chars ... }; }
      36             :         static memory::string memory_string() { return { Chars ... }; }
      37             :         static constexpr std::array<char, sizeof... (Chars)> array() { return {{ Chars ... }}; }
      38             : 
      39             :         template <typename Interface>
      40             :         auto to_string() -> typename Interface::StringType const { return { Chars ... }; }
      41             : 
      42             :         std::string to_std_string() const { return {Chars ...}; }
      43         130 :         std::u16string to_std_ustring() const { return {char16_t(Chars) ...}; }
      44             : 
      45             :         memory::string to_memory_string() const { return {Chars ...}; }
      46             :         memory::u16string to_memory_ustring() const { return {char16_t(Chars) ...}; }
      47             : 
      48             :         constexpr std::array<char, sizeof... (Chars)> to_array() const { return {{Chars...}}; }
      49             : 
      50             :         operator memory::string() const { return {Chars ...}; }
      51           0 :         operator std::string() const { return {Chars ...}; }
      52             : 
      53             :         constexpr size_t size() const { return sizeof ... (Chars); }
      54             : };
      55             : 
      56             : template <char... Lhs, char ... Rhs>
      57          10 : constexpr inline auto merge(const metastring<Lhs ...> &, const metastring<Rhs ...> &) {
      58          10 :         return metastring<Lhs ..., Rhs ...>();
      59             : }
      60             : 
      61             : template <typename ... Args, char... Lhs, char ... Rhs>
      62             : constexpr inline auto merge(const metastring<Lhs ...> &lhs, const metastring<Rhs ...> &rhs, Args && ... args) {
      63             :         return merge(lhs, merge(rhs, args ...));
      64             : }
      65             : 
      66             : template <char... Lhs>
      67             : constexpr inline auto merge(const metastring<Lhs ...> &lhs) {
      68             :         return lhs;
      69             : }
      70             : 
      71             : constexpr inline auto merge() {
      72             :         return metastring<>();
      73             : }
      74             : 
      75             : constexpr int num_digits (size_t x) { return x < 10 ? 1 : 1 + num_digits (x / 10); }
      76             : 
      77             : template<int size, size_t x, char... args>
      78             : struct numeric_builder {
      79             :         using type = typename numeric_builder<size - 1, x / 10, '0' + (x % 10), args...>::type;
      80             : };
      81             : 
      82             : template<size_t x, char... args>
      83             : struct numeric_builder<2, x, args...> {
      84             :         using type = metastring<'0' + x / 10, '0' + (x % 10), args...>;
      85             : };
      86             : 
      87             : template<size_t x, char... args>
      88             : struct numeric_builder<1, x, args...> {
      89             :         using type = metastring<'0' + x, args...>;
      90             : };
      91             : 
      92             : template<size_t x>
      93             : using numeric = typename numeric_builder<num_digits (x), x>::type;
      94             : 
      95             : }
      96             : 
      97             : 
      98             : namespace STAPPLER_VERSIONIZED stappler {
      99             : 
     100             : #ifdef __clang__
     101             : #pragma clang diagnostic push
     102             : #pragma clang diagnostic ignored "-Wgnu-string-literal-operator-template"
     103             : #endif
     104             : 
     105         130 : template <typename CharType, CharType ... Chars> auto operator "" _meta() {
     106         130 :         return metastring::metastring<Chars ...>();
     107             : }
     108             : 
     109             : #ifdef __clang__
     110             : #pragma clang diagnostic pop
     111             : #endif
     112             : 
     113             : }
     114             : 
     115             : 
     116             : namespace STAPPLER_VERSIONIZED stappler::metastring {
     117             : 
     118             : template <char ... Chars>
     119             : inline std::basic_ostream<char> &
     120             : operator << (std::basic_ostream<char> & os, const metastring<Chars ...> &str) {
     121             :         auto arr = str.to_array();
     122             :         return os.write(arr.data(), arr.size());
     123             : }
     124             : 
     125             : }
     126             : 
     127             : #endif /* STAPPLER_CORE_STRING_SPMETASTRING_H_ */