// Copyright 2017 Daniel Parker // Distributed under the Boost license, Version 1.0. // (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) // See https://github.com/danielaparker/jsoncons for latest version #ifndef JSONCONS_DECODE_JSON_HPP #define JSONCONS_DECODE_JSON_HPP #include <iostream> #include <string> #include <tuple> #include <memory> #include <istream> // std::basic_istream #include <jsoncons/decode_traits.hpp> #include <jsoncons/json_cursor.hpp> namespace jsoncons { // decode_json template <class T, class Source> typename std::enable_if<type_traits::is_basic_json<T>::value && type_traits::is_sequence_of<Source,typename T::char_type>::value,T>::type decode_json(const Source& s, const basic_json_decode_options<typename Source::value_type>& options = basic_json_decode_options<typename Source::value_type>()) { using char_type = typename Source::value_type; jsoncons::json_decoder<T> decoder; basic_json_reader<char_type, string_source<char_type>> reader(s, decoder, options); reader.read(); if (!decoder.is_valid()) { JSONCONS_THROW(ser_error(conv_errc::conversion_failed, reader.line(), reader.column())); } return decoder.get_result(); } template <class T, class Source> typename std::enable_if<!type_traits::is_basic_json<T>::value && type_traits::is_char_sequence<Source>::value,T>::type decode_json(const Source& s, const basic_json_decode_options<typename Source::value_type>& options = basic_json_decode_options<typename Source::value_type>()) { using char_type = typename Source::value_type; basic_json_cursor<char_type,string_source<char_type>> cursor(s, options, default_json_parsing()); jsoncons::json_decoder<basic_json<char_type>> decoder; std::error_code ec; T val = decode_traits<T,char_type>::decode(cursor, decoder, ec); if (ec) { JSONCONS_THROW(ser_error(ec, cursor.context().line(), cursor.context().column())); } return val; } template <class T, class CharT> typename std::enable_if<type_traits::is_basic_json<T>::value,T>::type decode_json(std::basic_istream<CharT>& is, const basic_json_decode_options<CharT>& options = basic_json_decode_options<CharT>()) { jsoncons::json_decoder<T> decoder; basic_json_reader<CharT, stream_source<CharT>> reader(is, decoder, options); reader.read(); if (!decoder.is_valid()) { JSONCONS_THROW(ser_error(conv_errc::conversion_failed, reader.line(), reader.column())); } return decoder.get_result(); } template <class T, class CharT> typename std::enable_if<!type_traits::is_basic_json<T>::value,T>::type decode_json(std::basic_istream<CharT>& is, const basic_json_decode_options<CharT>& options = basic_json_decode_options<CharT>()) { basic_json_cursor<CharT> cursor(is, options, default_json_parsing()); json_decoder<basic_json<CharT>> decoder{}; std::error_code ec; T val = decode_traits<T,CharT>::decode(cursor, decoder, ec); if (ec) { JSONCONS_THROW(ser_error(ec, cursor.line(), cursor.column())); } return val; } template <class T, class InputIt> typename std::enable_if<type_traits::is_basic_json<T>::value,T>::type decode_json(InputIt first, InputIt last, const basic_json_decode_options<typename std::iterator_traits<InputIt>::value_type>& options = basic_json_decode_options<typename std::iterator_traits<InputIt>::value_type>()) { using char_type = typename std::iterator_traits<InputIt>::value_type; jsoncons::json_decoder<T> decoder; basic_json_reader<char_type, iterator_source<InputIt>> reader(iterator_source<InputIt>(first,last), decoder, options); reader.read(); if (!decoder.is_valid()) { JSONCONS_THROW(ser_error(conv_errc::conversion_failed, reader.line(), reader.column())); } return decoder.get_result(); } template <class T, class InputIt> typename std::enable_if<!type_traits::is_basic_json<T>::value,T>::type decode_json(InputIt first, InputIt last, const basic_json_decode_options<typename std::iterator_traits<InputIt>::value_type>& options = basic_json_decode_options<typename std::iterator_traits<InputIt>::value_type>()) { using char_type = typename std::iterator_traits<InputIt>::value_type; basic_json_cursor<char_type,iterator_source<InputIt>> cursor(iterator_source<InputIt>(first, last), options, default_json_parsing()); jsoncons::json_decoder<basic_json<char_type>> decoder; std::error_code ec; T val = decode_traits<T,char_type>::decode(cursor, decoder, ec); if (ec) { JSONCONS_THROW(ser_error(ec, cursor.line(), cursor.column())); } return val; } // With leading allocator parameter template <class T,class Source,class TempAllocator> typename std::enable_if<type_traits::is_basic_json<T>::value && type_traits::is_sequence_of<Source,typename T::char_type>::value,T>::type decode_json(temp_allocator_arg_t, const TempAllocator& temp_alloc, const Source& s, const basic_json_decode_options<typename Source::value_type>& options = basic_json_decode_options<typename Source::value_type>()) { using char_type = typename Source::value_type; json_decoder<T,TempAllocator> decoder(temp_alloc); basic_json_reader<char_type, string_source<char_type>,TempAllocator> reader(s, decoder, options, temp_alloc); reader.read(); if (!decoder.is_valid()) { JSONCONS_THROW(ser_error(conv_errc::conversion_failed, reader.line(), reader.column())); } return decoder.get_result(); } template <class T,class Source,class TempAllocator> typename std::enable_if<!type_traits::is_basic_json<T>::value && type_traits::is_char_sequence<Source>::value,T>::type decode_json(temp_allocator_arg_t, const TempAllocator& temp_alloc, const Source& s, const basic_json_decode_options<typename Source::value_type>& options = basic_json_decode_options<typename Source::value_type>()) { using char_type = typename Source::value_type; basic_json_cursor<char_type,string_source<char_type>,TempAllocator> cursor(s, options, default_json_parsing(), temp_alloc); json_decoder<basic_json<char_type,sorted_policy,TempAllocator>,TempAllocator> decoder(result_allocator_arg, temp_alloc, temp_alloc); std::error_code ec; T val = decode_traits<T,char_type>::decode(cursor, decoder, ec); if (ec) { JSONCONS_THROW(ser_error(ec, cursor.context().line(), cursor.context().column())); } return val; } template <class T,class CharT,class TempAllocator> typename std::enable_if<type_traits::is_basic_json<T>::value,T>::type decode_json(temp_allocator_arg_t, const TempAllocator& temp_alloc, std::basic_istream<CharT>& is, const basic_json_decode_options<CharT>& options = basic_json_decode_options<CharT>()) { json_decoder<T,TempAllocator> decoder(temp_alloc); basic_json_reader<CharT, stream_source<CharT>,TempAllocator> reader(is, decoder, options, temp_alloc); reader.read(); if (!decoder.is_valid()) { JSONCONS_THROW(ser_error(conv_errc::conversion_failed, reader.line(), reader.column())); } return decoder.get_result(); } template <class T,class CharT,class TempAllocator> typename std::enable_if<!type_traits::is_basic_json<T>::value,T>::type decode_json(temp_allocator_arg_t, const TempAllocator& temp_alloc, std::basic_istream<CharT>& is, const basic_json_decode_options<CharT>& options = basic_json_decode_options<CharT>()) { basic_json_cursor<CharT,stream_source<CharT>,TempAllocator> cursor(is, options, default_json_parsing(), temp_alloc); json_decoder<basic_json<CharT,sorted_policy,TempAllocator>,TempAllocator> decoder(result_allocator_arg, temp_alloc,temp_alloc); std::error_code ec; T val = decode_traits<T,CharT>::decode(cursor, decoder, ec); if (ec) { JSONCONS_THROW(ser_error(ec, cursor.context().line(), cursor.context().column())); } return val; } } // jsoncons #endif