276 lines
10 KiB
C++
276 lines
10 KiB
C++
/*
|
|
* This file is part of libgim.
|
|
*
|
|
* libgim is free software: you can redistribute it and/or modify it under the
|
|
* terms of the GNU General Public License as published by the Free Software
|
|
* Foundation, either version 3 of the License, or (at your option) any later
|
|
* version.
|
|
*
|
|
* libgim is distributed in the hope that it will be useful, but WITHOUT ANY
|
|
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
|
|
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
|
|
* details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with libgim. If not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
* Copyright 2010-2015 Danny Robson <danny@nerdcruft.net>
|
|
*/
|
|
|
|
#ifndef __UTIL_JSON_TREE_HPP
|
|
#define __UTIL_JSON_TREE_HPP
|
|
|
|
#include <iostream>
|
|
#include <map>
|
|
#include <memory>
|
|
#include <string>
|
|
#include <vector>
|
|
|
|
#include <boost/filesystem.hpp>
|
|
|
|
#include "../iterator.hpp"
|
|
#include "./flat.hpp"
|
|
|
|
namespace json { namespace tree {
|
|
class node;
|
|
class object;
|
|
class array;
|
|
class string;
|
|
class number;
|
|
class boolean;
|
|
class null;
|
|
|
|
/// Parse an encoded form of JSON into a tree structure
|
|
extern std::unique_ptr<node> parse (const boost::filesystem::path &path);
|
|
extern std::unique_ptr<node> parse (const char *start, const char *stop);
|
|
extern std::unique_ptr<node> parse (const char *start);
|
|
extern std::unique_ptr<node> parse (const std::string&);
|
|
|
|
extern void write (const json::tree::node&, std::ostream&);
|
|
|
|
/// Abstract base for all JSON values
|
|
class node {
|
|
public:
|
|
virtual ~node () { ; }
|
|
|
|
virtual const object& as_object (void) const;
|
|
virtual const array& as_array (void) const;
|
|
virtual const string& as_string (void) const;
|
|
virtual const number& as_number (void) const;
|
|
virtual const boolean& as_boolean (void) const;
|
|
virtual const null& as_null (void) const;
|
|
|
|
virtual float as_float (void) const;
|
|
virtual double as_double (void) const;
|
|
virtual size_t as_uint (void) const;
|
|
|
|
virtual bool is_object (void) const { return false; }
|
|
virtual bool is_array (void) const { return false; }
|
|
virtual bool is_string (void) const { return false; }
|
|
virtual bool is_number (void) const { return false; }
|
|
virtual bool is_boolean (void) const { return false; }
|
|
virtual bool is_null (void) const { return false; }
|
|
|
|
virtual bool operator==(const node &rhs) const = 0;
|
|
virtual bool operator!=(const node &rhs) const;
|
|
virtual bool operator==(const object &) const { return false; }
|
|
virtual bool operator==(const array &) const { return false; }
|
|
virtual bool operator==(const string &) const { return false; }
|
|
virtual bool operator==(const number &) const { return false; }
|
|
virtual bool operator==(const boolean &) const { return false; }
|
|
virtual bool operator==(const null &) const { return false; }
|
|
|
|
virtual bool operator==(const char *rhs) const;
|
|
virtual bool operator!=(const char *rhs) const { return !(*this == rhs); }
|
|
|
|
virtual const node& operator[] (const std::string&) const;
|
|
virtual const node& operator[] (unsigned int) const;
|
|
|
|
virtual std::ostream& write (std::ostream &os) const = 0;
|
|
};
|
|
|
|
|
|
/// Represents a JSON object, and contains its children.
|
|
class object : public node {
|
|
protected:
|
|
typedef std::map<std::string, std::unique_ptr<node>> value_store;
|
|
public:
|
|
typedef value_store::iterator iterator;
|
|
typedef value_store::const_iterator const_iterator;
|
|
|
|
protected:
|
|
value_store m_values;
|
|
|
|
public:
|
|
virtual ~object ();
|
|
|
|
virtual const object& as_object (void) const { return *this; }
|
|
virtual bool is_object (void) const { return true; }
|
|
virtual bool operator==(const object &rhs) const;
|
|
virtual bool operator==(const node &rhs) const
|
|
{ return rhs == *this; }
|
|
|
|
virtual void insert (const std::string &key, std::unique_ptr<node>&& value);
|
|
virtual const node& operator[](const std::string &key) const;
|
|
virtual bool has (const std::string&) const;
|
|
|
|
virtual void clear (void);
|
|
virtual void erase (const std::string &key);
|
|
|
|
virtual const_iterator begin (void) const;
|
|
virtual const_iterator end (void) const;
|
|
|
|
virtual std::ostream& write (std::ostream &os) const;
|
|
};
|
|
|
|
|
|
/// Represents a JSON array, and contains its children.
|
|
class array : public node {
|
|
protected:
|
|
typedef std::vector<std::unique_ptr<node>>::iterator pointer_array_iterator;
|
|
typedef std::vector<std::unique_ptr<node>>::const_iterator const_pointer_array_iterator;
|
|
|
|
public:
|
|
typedef referencing_iterator<pointer_array_iterator> iterator;
|
|
typedef referencing_iterator<const_pointer_array_iterator> const_iterator;
|
|
|
|
protected:
|
|
std::vector<std::unique_ptr<node>> m_values;
|
|
|
|
public:
|
|
virtual ~array();
|
|
|
|
virtual const array& as_array (void) const { return *this; }
|
|
virtual bool is_array (void) const { return true; }
|
|
virtual bool operator==(const array &rhs) const;
|
|
virtual bool operator==(const node &rhs) const
|
|
{ return rhs == *this; }
|
|
|
|
virtual size_t size (void) const
|
|
{ return m_values.size (); }
|
|
virtual node& operator [](unsigned int idx)
|
|
{ return *m_values[idx]; }
|
|
virtual const node& operator [](unsigned int idx) const
|
|
{ return *m_values[idx]; }
|
|
|
|
virtual const_iterator begin (void) const { return const_iterator (m_values.begin ()); }
|
|
virtual const_iterator end (void) const { return const_iterator (m_values.end ()); }
|
|
|
|
virtual void insert (std::unique_ptr<json::tree::node> &&_value);
|
|
|
|
virtual std::ostream& write (std::ostream &os) const;
|
|
};
|
|
|
|
|
|
/// Represents a JSON string literal.
|
|
class string : public node {
|
|
protected:
|
|
std::string m_value;
|
|
|
|
public:
|
|
explicit string (const std::string &_value): m_value (_value) { ; }
|
|
explicit string (const char *_value): m_value (_value) { ; }
|
|
string (const char *_first, const char *_last): m_value (_first, _last) { ; }
|
|
|
|
virtual const string& as_string (void) const { return *this; }
|
|
virtual bool is_string (void) const { return true; }
|
|
virtual bool operator==(const char *rhs) const;
|
|
virtual bool operator==(const string &rhs) const;
|
|
virtual bool operator==(const node &rhs) const
|
|
{ return rhs == *this; }
|
|
|
|
virtual size_t size (void) const { return m_value.size (); }
|
|
|
|
operator const std::string&(void) const { return m_value; }
|
|
const std::string& native (void) const { return m_value; }
|
|
|
|
virtual std::ostream& write (std::ostream &os) const;
|
|
};
|
|
|
|
|
|
/// Represents a JSON integer/float literal.
|
|
class number : public node {
|
|
protected:
|
|
double m_value;
|
|
|
|
public:
|
|
explicit number (double _value): m_value (_value) { ; }
|
|
explicit number (int _value): m_value (_value) { ; }
|
|
explicit number (size_t _value): m_value (_value) { ; }
|
|
|
|
virtual const number& as_number (void) const { return *this; }
|
|
virtual bool is_number (void) const { return true; }
|
|
virtual bool operator==(const number &rhs) const;
|
|
virtual bool operator==(const node &rhs) const
|
|
{ return rhs == *this; }
|
|
|
|
operator double(void) const { return m_value; }
|
|
double native (void) const { return m_value; }
|
|
|
|
virtual std::ostream& write (std::ostream &os) const;
|
|
};
|
|
|
|
|
|
/// Represents a JSON boolean literal.
|
|
class boolean : public node {
|
|
protected:
|
|
bool m_value;
|
|
|
|
public:
|
|
explicit boolean (bool _value): m_value (_value) { ; }
|
|
|
|
virtual const boolean& as_boolean (void) const { return *this; }
|
|
virtual bool is_boolean (void) const { return true; }
|
|
virtual bool operator==(const boolean &rhs) const;
|
|
virtual bool operator==(const node &rhs) const
|
|
{ return rhs == *this; }
|
|
|
|
operator bool (void) const { return m_value; }
|
|
bool native (void) const { return m_value; }
|
|
|
|
virtual std::ostream& write (std::ostream &os) const;
|
|
};
|
|
|
|
|
|
/// Represents a JSON null value.
|
|
class null : public node {
|
|
public:
|
|
virtual bool operator==(const null&) const { return true; }
|
|
virtual bool operator==(const node &rhs) const
|
|
{ return rhs == *this; }
|
|
|
|
virtual bool is_null (void) const { return true; }
|
|
virtual const null& as_null (void) const { return *this; }
|
|
|
|
virtual std::ostream& write (std::ostream &os) const;
|
|
};
|
|
|
|
|
|
std::ostream&
|
|
operator <<(std::ostream &os, const json::tree::node &n);
|
|
|
|
|
|
// Instantiate this template for the type you wish to output. We use a
|
|
// helper class here to avoid partial template specialisation of a
|
|
// function (eg, for templated types).
|
|
template <typename T>
|
|
struct io {
|
|
static std::unique_ptr<json::tree::node> serialise (const T&);
|
|
static T deserialise (const json::tree::node&);
|
|
};
|
|
} }
|
|
|
|
template <typename T, class ...Args>
|
|
std::unique_ptr<json::tree::node> to_json (const T &t, Args&&... args) {
|
|
return json::tree::io<T>::serialise (t, std::forward<Args>(args)...);
|
|
}
|
|
|
|
template <typename T, class ...Args>
|
|
T from_json (const json::tree::node &n, Args&&... args) {
|
|
return json::tree::io<T>::deserialise (n, std::forward<Args>(args)...);
|
|
}
|
|
|
|
#endif
|
|
|
|
|