287 lines
10 KiB
C++
287 lines
10 KiB
C++
/*
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* This file is part of libgim.
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*
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* libgim is free software: you can redistribute it and/or modify it under the
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* terms of the GNU General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later
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* version.
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*
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* libgim is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with libgim. If not, see <http://www.gnu.org/licenses/>.
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*
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* Copyright 2010-2012 Danny Robson <danny@nerdcruft.net>
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*/
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#ifndef __UTIL_JSON_HPP
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#define __UTIL_JSON_HPP
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#include <iostream>
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#include <map>
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#include <memory>
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#include <string>
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#include <vector>
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#include <boost/filesystem.hpp>
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#include "iterator.hpp"
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namespace json {
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class node;
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class object;
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class array;
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class string;
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class number;
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class boolean;
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class null;
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extern std::unique_ptr<node> parse (const boost::filesystem::path &path);
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extern std::unique_ptr<node> parse (const char *start, const char *stop);
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extern std::unique_ptr<node> parse (const char *start);
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extern std::unique_ptr<node> parse (const std::string&);
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extern void write (const json::node&, std::ostream&);
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/// Abstract base for all JSON values
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class node {
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public:
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virtual ~node () { ; }
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virtual const object& as_object (void) const;
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virtual const array& as_array (void) const;
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virtual const string& as_string (void) const;
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virtual const number& as_number (void) const;
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virtual const boolean& as_boolean (void) const;
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virtual const null& as_null (void) const;
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virtual bool is_object (void) const { return false; }
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virtual bool is_array (void) const { return false; }
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virtual bool is_string (void) const { return false; }
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virtual bool is_number (void) const { return false; }
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virtual bool is_boolean (void) const { return false; }
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virtual bool is_null (void) const { return false; }
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virtual bool operator==(const node &rhs) const = 0;
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virtual bool operator!=(const node &rhs) const;
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virtual bool operator==(const object &) const { return false; }
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virtual bool operator==(const array &) const { return false; }
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virtual bool operator==(const string &) const { return false; }
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virtual bool operator==(const number &) const { return false; }
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virtual bool operator==(const boolean &) const { return false; }
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virtual bool operator==(const null &) const { return false; }
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virtual bool operator==(const char *rhs) const;
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virtual bool operator!=(const char *rhs) const { return !(*this == rhs); }
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virtual const node& operator[] (const std::string&) const;
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virtual const node& operator[] (unsigned int) const;
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virtual std::ostream& write (std::ostream &os) const = 0;
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};
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/// Represents a JSON object, and contains its children.
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class object : public node {
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protected:
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typedef std::map<std::string, std::unique_ptr<node>> value_store;
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public:
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typedef value_store::iterator iterator;
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typedef value_store::const_iterator const_iterator;
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protected:
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value_store m_values;
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public:
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virtual ~object ();
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virtual const object& as_object (void) const { return *this; }
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virtual bool is_object (void) const { return true; }
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virtual bool operator==(const object &rhs) const;
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virtual bool operator==(const node &rhs) const
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{ return rhs == *this; }
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virtual void insert (const std::string &key, std::unique_ptr<node>&& value);
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virtual const node& operator[](const std::string &key) const;
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virtual bool has (const std::string&) const;
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virtual void clear (void);
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virtual void erase (const std::string &key);
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virtual const_iterator begin (void) const;
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virtual const_iterator end (void) const;
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virtual std::ostream& write (std::ostream &os) const;
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};
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/// Represents a JSON array, and contains its children.
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class array : public node {
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protected:
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typedef std::vector<std::unique_ptr<node>>::iterator pointer_array_iterator;
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typedef std::vector<std::unique_ptr<node>>::const_iterator const_pointer_array_iterator;
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public:
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typedef referencing_iterator<pointer_array_iterator> iterator;
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typedef referencing_iterator<const_pointer_array_iterator> const_iterator;
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protected:
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std::vector<std::unique_ptr<node>> m_values;
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public:
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virtual ~array();
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virtual const array& as_array (void) const { return *this; }
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virtual bool is_array (void) const { return true; }
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virtual bool operator==(const array &rhs) const;
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virtual bool operator==(const node &rhs) const
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{ return rhs == *this; }
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virtual size_t size (void) const
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{ return m_values.size (); }
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virtual node& operator [](unsigned int idx)
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{ return *m_values[idx]; }
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virtual const node& operator [](unsigned int idx) const
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{ return *m_values[idx]; }
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virtual const_iterator begin (void) const { return const_iterator (m_values.begin ()); }
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virtual const_iterator end (void) const { return const_iterator (m_values.end ()); }
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virtual void insert (std::unique_ptr<json::node> &&_value);
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virtual std::ostream& write (std::ostream &os) const;
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};
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/// Represents a JSON string literal.
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class string : public node {
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protected:
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std::string m_value;
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public:
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explicit string (const std::string &_value): m_value (_value) { ; }
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explicit string (const char *_value): m_value (_value) { ; }
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virtual const string& as_string (void) const { return *this; }
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virtual bool is_string (void) const { return true; }
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virtual bool operator==(const char *rhs) const;
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virtual bool operator==(const string &rhs) const;
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virtual bool operator==(const node &rhs) const
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{ return rhs == *this; }
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virtual size_t size (void) const { return m_value.size (); }
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operator const std::string&(void) const { return m_value; }
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const std::string& native (void) const { return m_value; }
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virtual std::ostream& write (std::ostream &os) const;
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};
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/// Represents a JSON integer/float literal.
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class number : public node {
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protected:
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double m_value;
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public:
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explicit number (double _value): m_value (_value) { ; }
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explicit number (int _value): m_value (_value) { ; }
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virtual const number& as_number (void) const { return *this; }
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virtual bool is_number (void) const { return true; }
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virtual bool operator==(const number &rhs) const;
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virtual bool operator==(const node &rhs) const
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{ return rhs == *this; }
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operator double(void) const { return m_value; }
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double native (void) const { return m_value; }
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virtual std::ostream& write (std::ostream &os) const;
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};
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/// Represents a JSON boolean literal.
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class boolean : public node {
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protected:
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bool m_value;
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public:
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explicit boolean (bool _value): m_value (_value) { ; }
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virtual const boolean& as_boolean (void) const { return *this; }
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virtual bool is_boolean (void) const { return true; }
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virtual bool operator==(const boolean &rhs) const;
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virtual bool operator==(const node &rhs) const
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{ return rhs == *this; }
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operator bool (void) const { return m_value; }
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bool native (void) const { return m_value; }
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virtual std::ostream& write (std::ostream &os) const;
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};
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/// Represents a JSON null value.
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class null : public node {
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public:
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virtual bool operator==(const null&) const { return true; }
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virtual bool operator==(const node &rhs) const
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{ return rhs == *this; }
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virtual bool is_null (void) const { return true; }
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virtual const null& as_null (void) const { return *this; }
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virtual std::ostream& write (std::ostream &os) const;
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};
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/// The base class for all exceptions throw directly by the json namespace.
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class error : public std::runtime_error {
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public:
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error (const std::string &_what):
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std::runtime_error (_what)
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{ ; }
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};
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/// Base class for all type conversion errors
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class type_error : public error {
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public:
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type_error (const std::string &_what):
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error (_what)
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{ ; }
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};
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/// Base class for errors thrown during parsing
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class parse_error : public error {
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public:
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parse_error (const std::string &_what):
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error (_what)
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{ ; }
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};
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/// Base class for errors thrown during schema validation
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class schema_error : public error {
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public:
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schema_error (const std::string &_what):
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error (_what)
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{ ; }
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};
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template <typename T>
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json::node&& to_json (const T&);
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template <typename T>
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T&& from_json (const json::node&);
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}
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std::ostream&
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operator <<(std::ostream &os, const json::node &n);
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#endif
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