mirror of https://github.com/vitalif/grive2
145 lines
3.8 KiB
C++
145 lines
3.8 KiB
C++
/*
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grive: an GPL program to sync a local directory with Google Drive
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Copyright (C) 2012 Wan Wai Ho
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation version 2
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of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#pragma once
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#include "util/Exception.hh"
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#include <string>
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#include <map>
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#include <vector>
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struct json_object ;
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namespace gr {
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class DataStream ;
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/*! \brief Simple wrapper around JSON-C objects.
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This class represents JSON-C objects, which can be integers, booleans, strings
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double, arrays and object.
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*/
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class Json
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{
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public :
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typedef std::map<std::string, Json> Object ;
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typedef std::vector<Json> Array ;
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struct Error : virtual Exception {} ;
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typedef boost::error_info<struct JsonTag, std::string> Json_ ;
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typedef boost::error_info<struct OutOfRange, std::size_t> OutOfRange_ ;
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typedef boost::error_info<struct KeyNotFound, std::string> KeyNotFound_ ;
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typedef boost::error_info<struct JsonCApi, std::string> JsonCApi_ ;
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typedef boost::error_info<struct Value, std::string> Value_ ;
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typedef boost::error_info<struct ErrMsg, std::string> ErrMsg_ ;
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template <typename T>
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struct Val_
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{
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typedef boost::error_info<struct Value, T> Err ;
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} ;
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public :
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template <typename T>
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explicit Json( const T& val ) ;
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template <std::size_t n>
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explicit Json( const char (&str)[n] ) :
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m_json( InitStr( str, n ) )
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{
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}
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Json() ;
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Json( const Json& rhs ) ;
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Json( const char *str ) ;
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~Json() ;
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static Json Parse( const std::string& str ) ;
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static Json Parse( DataStream *in ) ;
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Json operator[]( const std::string& key ) const ;
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Json operator[]( const std::size_t& idx ) const ;
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Json& operator=( const Json& rhs ) ;
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void Swap( Json& other ) ;
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std::string Str() const ;
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int Int() const ;
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double Double() const ;
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bool Bool() const ;
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Array AsArray() const ;
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Object AsObject() const ;
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template <typename T>
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bool Is() const ;
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template <typename T>
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T As() const ;
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bool Has( const std::string& key ) const ;
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bool Get( const std::string& key, Json& json ) const ;
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void Add( const std::string& key, const Json& json ) ;
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void Add( const Json& json ) ;
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Json FindInArray( const std::string& key, const std::string& value ) const ;
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bool FindInArray( const std::string& key, const std::string& value, Json& result ) const ;
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/** Expect *this is a JSON array of objects. Select all "key" values inside each
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objects in the array and copies them in the output iterator \a out.
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*/
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template <typename T, typename Out>
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Out Select( const std::string& key, Out out )
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{
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Array a = AsArray() ;
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for ( Array::iterator i = a.begin() ; i != a.end() ; ++i )
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{
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Json value;
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if ( i->Get( key, value ) )
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*out++ = value.As<T>() ;
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}
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return out ;
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}
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friend std::ostream& operator<<( std::ostream& os, const Json& json ) ;
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void Write( DataStream *out ) const ;
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enum Type { null_type, bool_type, double_type, int_type, object_type, array_type, string_type } ;
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Type DataType() const ;
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private :
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Json( struct json_object *json ) ;
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struct NotOwned {} ;
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Json( struct json_object *json, NotOwned ) ;
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static struct json_object* InitStr( const char *str, std::size_t n ) ;
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// helper for throwing exception
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template <typename T> static typename Val_<T>::Err ValueErr( const T& t )
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{
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return typename Val_<T>::Err(t);
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}
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private :
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struct json_object *m_json ;
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} ;
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}
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