| // ---------------------------------------------------------------------------- |
| // Copyright (C) 2015 Sebastian Redl |
| // |
| // Distributed under the Boost Software License, Version 1.0. |
| // (See accompanying file LICENSE_1_0.txt or copy at |
| // http://www.boost.org/LICENSE_1_0.txt) |
| // |
| // For more information, see www.boost.org |
| // ---------------------------------------------------------------------------- |
| #ifndef BOOST_PROPERTY_TREE_DETAIL_JSON_PARSER_READ_HPP |
| #define BOOST_PROPERTY_TREE_DETAIL_JSON_PARSER_READ_HPP |
| |
| #include <boost/property_tree/json_parser/detail/parser.hpp> |
| #include <boost/property_tree/json_parser/detail/narrow_encoding.hpp> |
| #include <boost/property_tree/json_parser/detail/wide_encoding.hpp> |
| #include <boost/property_tree/json_parser/detail/standard_callbacks.hpp> |
| |
| #include <boost/static_assert.hpp> |
| #include <boost/type_traits/is_same.hpp> |
| |
| #include <istream> |
| #include <iterator> |
| #include <string> |
| |
| namespace boost { namespace property_tree { |
| namespace json_parser { namespace detail |
| { |
| |
| template <typename Iterator, typename Sentinel> |
| class minirange |
| { |
| public: |
| minirange(Iterator first, Sentinel last) : first(first), last(last) {} |
| Iterator begin() const { return first; } |
| Sentinel end() const { return last; } |
| |
| private: |
| Iterator first; |
| Sentinel last; |
| }; |
| template <typename Iterator, typename Sentinel> |
| minirange<Iterator, Sentinel> make_minirange(Iterator first, Sentinel last) |
| { |
| return minirange<Iterator, Sentinel>(first, last); |
| } |
| |
| template <typename Iterator, typename Sentinel, |
| typename Encoding, typename Callbacks> |
| void read_json_internal(Iterator first, Sentinel last, Encoding& encoding, |
| Callbacks& callbacks, const std::string& filename) |
| { |
| BOOST_STATIC_ASSERT_MSG((boost::is_same< |
| typename std::iterator_traits<Iterator>::value_type, |
| typename Encoding::external_char>::value), |
| "Encoding is not capable of using the iterator's value type."); |
| BOOST_STATIC_ASSERT_MSG((boost::is_same< |
| typename Callbacks::char_type, |
| typename Encoding::internal_char>::value), |
| "Encoding is not capable of producing the needed character type."); |
| |
| detail::parser<Callbacks, Encoding, Iterator, Sentinel> |
| parser(callbacks, encoding); |
| parser.set_input(filename, make_minirange(first, last)); |
| parser.parse_value(); |
| parser.finish(); |
| } |
| |
| template <typename Ch> struct encoding; |
| template <> struct encoding<char> : utf8_utf8_encoding {}; |
| template <> struct encoding<wchar_t> : wide_wide_encoding {}; |
| |
| template <typename Ptree> |
| void read_json_internal( |
| std::basic_istream<typename Ptree::key_type::value_type> &stream, |
| Ptree &pt, const std::string &filename) |
| { |
| typedef typename Ptree::key_type::value_type char_type; |
| typedef standard_callbacks<Ptree> callbacks_type; |
| typedef detail::encoding<char_type> encoding_type; |
| typedef std::istreambuf_iterator<char_type> iterator; |
| callbacks_type callbacks; |
| encoding_type encoding; |
| read_json_internal(iterator(stream), iterator(), |
| encoding, callbacks, filename); |
| pt.swap(callbacks.output()); |
| } |
| |
| }}}} |
| |
| #endif |