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// ----------------------------------------------------------------------------
// Copyright (C) 2002-2006 Marcin Kalicinski
// 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_JSON_PARSER_HPP_INCLUDED
#define BOOST_PROPERTY_TREE_JSON_PARSER_HPP_INCLUDED
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/detail/json_parser_error.hpp>
#include <boost/property_tree/detail/json_parser/read.hpp>
#include <boost/property_tree/detail/json_parser_write.hpp>
#include <fstream>
#include <string>
#include <locale>
namespace boost { namespace property_tree { namespace json_parser
{
/**
* Read JSON from a the given stream and translate it to a property tree.
* @note Clears existing contents of property tree. In case of error the
* property tree unmodified.
* @note Items of JSON arrays are translated into ptree keys with empty
* names. Members of objects are translated into named keys.
* @note JSON data can be a string, a numeric value, or one of literals
* "null", "true" and "false". During parse, any of the above is
* copied verbatim into ptree data string.
* @throw json_parser_error In case of error deserializing the property
* tree.
* @param stream Stream from which to read in the property tree.
* @param[out] pt The property tree to populate.
*/
template<class Ptree>
void read_json(std::basic_istream<
typename Ptree::key_type::value_type
> &stream,
Ptree &pt)
{
detail::read_json_internal(stream, pt, std::string());
}
/**
* Read JSON from a the given file and translate it to a property tree.
* @note Clears existing contents of property tree. In case of error the
* property tree unmodified.
* @note Items of JSON arrays are translated into ptree keys with empty
* names. Members of objects are translated into named keys.
* @note JSON data can be a string, a numeric value, or one of literals
* "null", "true" and "false". During parse, any of the above is
* copied verbatim into ptree data string.
* @throw json_parser_error In case of error deserializing the property
* tree.
* @param filename Name of file from which to read in the property tree.
* @param[out] pt The property tree to populate.
* @param loc The locale to use when reading in the file contents.
*/
template<class Ptree>
void read_json(const std::string &filename,
Ptree &pt,
const std::locale &loc = std::locale())
{
std::basic_ifstream<typename Ptree::key_type::value_type>
stream(filename.c_str());
if (!stream)
BOOST_PROPERTY_TREE_THROW(json_parser_error(
"cannot open file", filename, 0));
stream.imbue(loc);
detail::read_json_internal(stream, pt, filename);
}
/**
* Translates the property tree to JSON and writes it the given output
* stream.
* @note Any property tree key containing only unnamed subkeys will be
* rendered as JSON arrays.
* @pre @e pt cannot contain keys that have both subkeys and non-empty data.
* @throw json_parser_error In case of error translating the property tree
* to JSON or writing to the output stream.
* @param stream The stream to which to write the JSON representation of the
* property tree.
* @param pt The property tree to tranlsate to JSON and output.
* @param pretty Whether to pretty-print. Defaults to true for backward
* compatibility.
*/
template<class Ptree>
void write_json(std::basic_ostream<
typename Ptree::key_type::value_type
> &stream,
const Ptree &pt,
bool pretty = true)
{
write_json_internal(stream, pt, std::string(), pretty);
}
/**
* Translates the property tree to JSON and writes it the given file.
* @note Any property tree key containing only unnamed subkeys will be
* rendered as JSON arrays.
* @pre @e pt cannot contain keys that have both subkeys and non-empty data.
* @throw json_parser_error In case of error translating the property tree
* to JSON or writing to the file.
* @param filename The name of the file to which to write the JSON
* representation of the property tree.
* @param pt The property tree to translate to JSON and output.
* @param loc The locale to use when writing out to the output file.
* @param pretty Whether to pretty-print. Defaults to true and last place
* for backward compatibility.
*/
template<class Ptree>
void write_json(const std::string &filename,
const Ptree &pt,
const std::locale &loc = std::locale(),
bool pretty = true)
{
std::basic_ofstream<typename Ptree::key_type::value_type>
stream(filename.c_str());
if (!stream)
BOOST_PROPERTY_TREE_THROW(json_parser_error(
"cannot open file", filename, 0));
stream.imbue(loc);
write_json_internal(stream, pt, filename, pretty);
}
} } }
namespace boost { namespace property_tree
{
using json_parser::read_json;
using json_parser::write_json;
using json_parser::json_parser_error;
} }
#endif
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