mirror of
https://github.com/nlohmann/json.git
synced 2024-07-05 13:56:59 +02:00
616caea27a
* Make exception context optional Change exception context parameter to pointer and replace context with nullptr where appropriate. * Support escaping other string types * Add string concatenation function Add variadic concat() function for concatenating char *, char, and string types. * Replace string concatenations using + with concat() * Template json_pointer on string type Change json_pointer from being templated on basic_json to being templated on string type. * Add unit test for #3388 Closes #3388. * Fix regression test for #2958 * Add backwards compatibility with json_pointer<basic_json> * Update json_pointer docs * Allow comparing different json_pointers * Update version numbers
140 lines
5.6 KiB
C++
140 lines
5.6 KiB
C++
#pragma once
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#include <cstring> // strlen
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#include <string> // string
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#include <utility> // forward
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#include <nlohmann/detail/meta/cpp_future.hpp>
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#include <nlohmann/detail/meta/detected.hpp>
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namespace nlohmann
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{
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namespace detail
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{
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inline std::size_t concat_length()
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{
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return 0;
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}
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template<typename... Args>
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inline std::size_t concat_length(const char* cstr, Args&& ... rest);
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template<typename StringType, typename... Args>
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inline std::size_t concat_length(const StringType& str, Args&& ... rest);
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template<typename... Args>
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inline std::size_t concat_length(const char /*c*/, Args&& ... rest)
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{
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return 1 + concat_length(std::forward<Args>(rest)...);
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}
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template<typename... Args>
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inline std::size_t concat_length(const char* cstr, Args&& ... rest)
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{
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// cppcheck-suppress ignoredReturnValue
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return ::strlen(cstr) + concat_length(std::forward<Args>(rest)...);
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}
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template<typename StringType, typename... Args>
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inline std::size_t concat_length(const StringType& str, Args&& ... rest)
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{
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return str.size() + concat_length(std::forward<Args>(rest)...);
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}
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template<typename OutStringType>
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inline void concat_into(OutStringType& /*out*/)
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{}
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template<typename StringType, typename Arg>
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using string_can_append = decltype(std::declval<StringType&>().append(std::declval < Arg && > ()));
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template<typename StringType, typename Arg>
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using detect_string_can_append = is_detected<string_can_append, StringType, Arg>;
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template<typename StringType, typename Arg>
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using string_can_append_op = decltype(std::declval<StringType&>() += std::declval < Arg && > ());
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template<typename StringType, typename Arg>
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using detect_string_can_append_op = is_detected<string_can_append_op, StringType, Arg>;
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template<typename StringType, typename Arg>
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using string_can_append_iter = decltype(std::declval<StringType&>().append(std::declval<const Arg&>().begin(), std::declval<const Arg&>().end()));
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template<typename StringType, typename Arg>
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using detect_string_can_append_iter = is_detected<string_can_append_iter, StringType, Arg>;
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template<typename StringType, typename Arg>
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using string_can_append_data = decltype(std::declval<StringType&>().append(std::declval<const Arg&>().data(), std::declval<const Arg&>().size()));
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template<typename StringType, typename Arg>
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using detect_string_can_append_data = is_detected<string_can_append_data, StringType, Arg>;
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template < typename OutStringType, typename Arg, typename... Args,
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enable_if_t < !detect_string_can_append<OutStringType, Arg>::value
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&& detect_string_can_append_op<OutStringType, Arg>::value, int > = 0 >
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inline void concat_into(OutStringType& out, Arg && arg, Args && ... rest);
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template < typename OutStringType, typename Arg, typename... Args,
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enable_if_t < !detect_string_can_append<OutStringType, Arg>::value
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&& !detect_string_can_append_op<OutStringType, Arg>::value
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&& detect_string_can_append_iter<OutStringType, Arg>::value, int > = 0 >
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inline void concat_into(OutStringType& out, const Arg& arg, Args && ... rest);
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template < typename OutStringType, typename Arg, typename... Args,
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enable_if_t < !detect_string_can_append<OutStringType, Arg>::value
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&& !detect_string_can_append_op<OutStringType, Arg>::value
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&& !detect_string_can_append_iter<OutStringType, Arg>::value
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&& detect_string_can_append_data<OutStringType, Arg>::value, int > = 0 >
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inline void concat_into(OutStringType& out, const Arg& arg, Args && ... rest);
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template<typename OutStringType, typename Arg, typename... Args,
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enable_if_t<detect_string_can_append<OutStringType, Arg>::value, int> = 0>
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inline void concat_into(OutStringType& out, Arg && arg, Args && ... rest)
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{
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out.append(std::forward<Arg>(arg));
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concat_into(out, std::forward<Args>(rest)...);
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}
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template < typename OutStringType, typename Arg, typename... Args,
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enable_if_t < !detect_string_can_append<OutStringType, Arg>::value
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&& detect_string_can_append_op<OutStringType, Arg>::value, int > >
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inline void concat_into(OutStringType& out, Arg&& arg, Args&& ... rest)
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{
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out += std::forward<Arg>(arg);
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concat_into(out, std::forward<Args>(rest)...);
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}
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template < typename OutStringType, typename Arg, typename... Args,
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enable_if_t < !detect_string_can_append<OutStringType, Arg>::value
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&& !detect_string_can_append_op<OutStringType, Arg>::value
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&& detect_string_can_append_iter<OutStringType, Arg>::value, int > >
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inline void concat_into(OutStringType& out, const Arg& arg, Args&& ... rest)
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{
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out.append(arg.begin(), arg.end());
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concat_into(out, std::forward<Args>(rest)...);
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}
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template < typename OutStringType, typename Arg, typename... Args,
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enable_if_t < !detect_string_can_append<OutStringType, Arg>::value
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&& !detect_string_can_append_op<OutStringType, Arg>::value
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&& !detect_string_can_append_iter<OutStringType, Arg>::value
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&& detect_string_can_append_data<OutStringType, Arg>::value, int > >
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inline void concat_into(OutStringType& out, const Arg& arg, Args&& ... rest)
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{
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out.append(arg.data(), arg.size());
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concat_into(out, std::forward<Args>(rest)...);
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}
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template<typename OutStringType = std::string, typename... Args>
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inline OutStringType concat(Args && ... args)
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{
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OutStringType str;
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str.reserve(concat_length(std::forward<Args>(args)...));
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concat_into(str, std::forward<Args>(args)...);
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return str;
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}
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} // namespace detail
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} // namespace nlohmann
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