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authorRichard <q@1bpm.net>2022-09-04 00:32:56 +0100
committerRichard <q@1bpm.net>2022-09-04 00:32:56 +0100
commit1d055261b4144dbf86b2658437015b15d4dd9bff (patch)
tree6049b19d1bf953a650383de1a5e438b8b82679f6 /include/jsoncons/decode_json.hpp
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diff --git a/include/jsoncons/decode_json.hpp b/include/jsoncons/decode_json.hpp
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+// 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
+