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// -*- mode: c++; c-basic-offset: 4; -*-
// Author: Hong Jiang <hong@hjiang.net>
// Contributors:
// Sean Middleditch <sean@middleditch.us>
// rlyeh <https://github.com/r-lyeh>
#pragma once
#include <cstddef>
#include <cassert>
#include <iostream>
#include <map>
#include <vector>
#include <string>
#include <sstream>
// jsonxx versioning: major.minor-extra where
// major = { number }
// minor = { number }
// extra = { 'a':alpha, 'b':beta, 'rc': release candidate, 'r': release, 's':stable }
#define JSONXX_MAJOR "0"
#define JSONXX_MINOR "22"
#define JSONXX_EXTRA "a"
#define JSONXX_VERSION JSONXX_MAJOR "." JSONXX_MINOR "-" JSONXX_EXTRA
#define JSONXX_XML_TAG "<!-- generated by jsonxx " JSONXX_VERSION " -->"
#if __cplusplus > 199711L
#define JSONXX_COMPILER_HAS_CXX11 1
#elif defined(_MSC_VER) && _MSC_VER > 1700
#define JSONXX_COMPILER_HAS_CXX11 1
#else
#define JSONXX_COMPILER_HAS_CXX11 0
#endif
#ifdef _MSC_VER
// disable the C4127 warning if using VC, see http://stackoverflow.com/a/12042515
#define JSONXX_ASSERT(...) \
do { \
__pragma(warning(push)) __pragma(warning(disable:4127)) \
if( jsonxx::Assertions ) \
__pragma(warning(pop)) \
jsonxx::assertion(__FILE__,__LINE__,#__VA_ARGS__,bool(__VA_ARGS__)); \
__pragma(warning(push)) __pragma(warning(disable:4127)) \
} while(0) \
__pragma(warning(pop))
#else
#define JSONXX_ASSERT(...) do { if( jsonxx::Assertions ) \
jsonxx::assertion(__FILE__,__LINE__,#__VA_ARGS__,bool(__VA_ARGS__)); } while(0)
#endif
namespace jsonxx {
// FIXME(hjiang): Those should really be dynamic.
// Settings
enum Settings {
// constants
Enabled = true,
Disabled = false,
Permissive = true,
Strict = false,
// values
Parser = Permissive, // permissive or strict parsing
UnquotedKeys = Disabled, // support of unquoted keys
Assertions = Enabled // enabled or disabled assertions (these asserts work both in DEBUG and RELEASE builds)
};
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable:4127)
#endif
inline bool parser_is_strict() { return Parser == Strict; }
inline bool parser_is_permissive() { return Parser == Permissive; }
inline bool unquoted_keys_are_enabled() { return UnquotedKeys == Enabled; }
#ifdef _MSC_VER
#pragma warning(pop)
#endif
// Constants for .write() and .xml() methods
enum Format {
JSON = 0, // JSON output
JSONx = 1, // XML output, JSONx format. see http://goo.gl/I3cxs
JXML = 2, // XML output, JXML format. see https://github.com/r-lyeh/JXML
JXMLex = 3, // XML output, JXMLex format. see https://github.com/r-lyeh/JXMLex
TaggedXML = 4 // XML output, tagged XML format. see https://github.com/hjiang/jsonxx/issues/12
};
// Types
typedef long double Number;
typedef bool Boolean;
typedef std::string String;
struct Null {};
class Value;
class Object;
class Array;
// Identity meta-function
template <typename T>
struct identity {
typedef T type;
};
// Tools
bool validate( const std::string &input );
bool validate( std::istream &input );
std::string reformat( const std::string &input );
std::string reformat( std::istream &input );
std::string xml( const std::string &input, unsigned format = JSONx );
std::string xml( std::istream &input, unsigned format = JSONx );
// Detail
void assertion( const char *file, int line, const char *expression, bool result );
// A JSON Object
class Object {
public:
Object();
~Object();
template <typename T>
bool has(const std::string& key) const;
// Always call has<>() first. If the key doesn't exist, consider
// the behavior undefined.
template <typename T>
T& get(const std::string& key);
template <typename T>
const T& get(const std::string& key) const;
template <typename T>
const T& get(const std::string& key, const typename identity<T>::type& default_value) const;
size_t size() const;
bool empty() const;
const std::map<std::string, Value*>& kv_map() const;
std::string json() const;
std::string xml( unsigned format = JSONx, const std::string &header = std::string(), const std::string &attrib = std::string() ) const;
std::string write( unsigned format ) const;
void reset();
bool parse(std::istream &input);
bool parse(const std::string &input);
typedef std::map<std::string, Value*> container;
void import( const Object &other );
void import( const std::string &key, const Value &value );
Object &operator<<(const Value &value);
Object &operator<<(const Object &value);
Object &operator=(const Object &value);
Object(const Object &other);
Object(const std::string &key, const Value &value);
template<size_t N>
Object(const char (&key)[N], const Value &value) {
import(key,value);
}
template<typename T>
Object &operator<<(const T &value);
protected:
static bool parse(std::istream& input, Object& object);
container value_map_;
std::string odd;
};
class Array {
public:
Array();
~Array();
size_t size() const;
bool empty() const;
template <typename T>
bool has(unsigned int i) const;
template <typename T>
T& get(unsigned int i);
template <typename T>
const T& get(unsigned int i) const;
template <typename T>
const T& get(unsigned int i, const typename identity<T>::type& default_value) const;
const std::vector<Value*>& values() const {
return values_;
}
std::string json() const;
std::string xml( unsigned format = JSONx, const std::string &header = std::string(), const std::string &attrib = std::string() ) const;
std::string write( unsigned format ) const { return format == JSON ? json() : xml(format); }
void reset();
bool parse(std::istream &input);
bool parse(const std::string &input);
typedef std::vector<Value*> container;
void append(const Array &other);
void append(const Value &value) { import(value); }
void import(const Array &other);
void import(const Value &value);
Array &operator<<(const Array &other);
Array &operator<<(const Value &value);
Array &operator=(const Array &other);
Array &operator=(const Value &value);
Array(const Array &other);
Array(const Value &value);
protected:
static bool parse(std::istream& input, Array& array);
container values_;
};
// A value could be a number, an array, a string, an object, a
// boolean, or null
class Value {
public:
Value();
~Value() { reset(); }
void reset();
template<typename T>
void import( const T & ) {
reset();
type_ = INVALID_;
// debug
// std::cout << "[WARN] No support for " << typeid(t).name() << std::endl;
}
void import( const bool &b ) {
reset();
type_ = BOOL_;
bool_value_ = b;
}
#define $number(TYPE) \
void import( const TYPE &n ) { \
reset(); \
type_ = NUMBER_; \
number_value_ = static_cast<long double>(n); \
}
$number( char )
$number( int )
$number( long )
$number( long long )
$number( unsigned char )
$number( unsigned int )
$number( unsigned long )
$number( unsigned long long )
$number( float )
$number( double )
$number( long double )
#undef $number
#if JSONXX_COMPILER_HAS_CXX11 > 0
void import( const std::nullptr_t & ) {
reset();
type_ = NULL_;
}
#endif
void import( const Null & ) {
reset();
type_ = NULL_;
}
void import( const String &s ) {
reset();
type_ = STRING_;
*( string_value_ = new String() ) = s;
}
void import( const char* s ) {
reset();
type_ = STRING_;
*( string_value_ = new String() ) = s;
}
void import( const Array &a ) {
reset();
type_ = ARRAY_;
*( array_value_ = new Array() ) = a;
}
void import( const Object &o ) {
reset();
type_ = OBJECT_;
*( object_value_ = new Object() ) = o;
}
void import( const Value &other ) {
if (this != &other)
switch (other.type_) {
case NULL_:
import( Null() );
break;
case BOOL_:
import( other.bool_value_ );
break;
case NUMBER_:
import( other.number_value_ );
break;
case STRING_:
import( *other.string_value_ );
break;
case ARRAY_:
import( *other.array_value_ );
break;
case OBJECT_:
import( *other.object_value_ );
break;
case INVALID_:
type_ = INVALID_;
break;
default:
JSONXX_ASSERT( !"not implemented" );
}
}
template<typename T>
Value &operator <<( const T &t ) {
import(t);
return *this;
}
template<typename T>
Value &operator =( const T &t ) {
reset();
import(t);
return *this;
}
Value(const Value &other);
template<typename T>
Value( const T&t ) : type_(INVALID_) { import(t); }
template<size_t N>
Value( const char (&t)[N] ) : type_(INVALID_) { import( std::string(t) ); }
bool parse(std::istream &input);
bool parse(const std::string &input);
template<typename T>
bool is() const;
template<typename T>
T& get();
template<typename T>
const T& get() const;
bool empty() const;
public:
enum {
NUMBER_,
STRING_,
BOOL_,
NULL_,
ARRAY_,
OBJECT_,
INVALID_
} type_;
union {
Number number_value_;
String* string_value_;
Boolean bool_value_;
Array* array_value_;
Object* object_value_;
};
protected:
static bool parse(std::istream& input, Value& value);
};
template <typename T>
bool Array::has(unsigned int i) const {
if (i >= size()) {
return false;
} else {
Value* v = values_.at(i);
return v->is<T>();
}
}
template <typename T>
T& Array::get(unsigned int i) {
JSONXX_ASSERT(i < size());
Value* v = values_.at(i);
return v->get<T>();
}
template <typename T>
const T& Array::get(unsigned int i) const {
JSONXX_ASSERT(i < size());
const Value* v = values_.at(i);
return v->get<T>();
}
template <typename T>
const T& Array::get(unsigned int i, const typename identity<T>::type& default_value) const {
if(has<T>(i)) {
const Value* v = values_.at(i);
return v->get<T>();
} else {
return default_value;
}
}
template <typename T>
bool Object::has(const std::string& key) const {
container::const_iterator it(value_map_.find(key));
return it != value_map_.end() && it->second->is<T>();
}
template <typename T>
T& Object::get(const std::string& key) {
JSONXX_ASSERT(has<T>(key));
return value_map_.find(key)->second->get<T>();
}
template <typename T>
const T& Object::get(const std::string& key) const {
JSONXX_ASSERT(has<T>(key));
return value_map_.find(key)->second->get<T>();
}
template <typename T>
const T& Object::get(const std::string& key, const typename identity<T>::type& default_value) const {
if (has<T>(key)) {
return value_map_.find(key)->second->get<T>();
} else {
return default_value;
}
}
template<>
inline bool Value::is<Value>() const {
return true;
}
template<>
inline bool Value::is<Null>() const {
return type_ == NULL_;
}
template<>
inline bool Value::is<Boolean>() const {
return type_ == BOOL_;
}
template<>
inline bool Value::is<String>() const {
return type_ == STRING_;
}
template<>
inline bool Value::is<Number>() const {
return type_ == NUMBER_;
}
template<>
inline bool Value::is<Array>() const {
return type_ == ARRAY_;
}
template<>
inline bool Value::is<Object>() const {
return type_ == OBJECT_;
}
template<>
inline Value& Value::get<Value>() {
return *this;
}
template<>
inline const Value& Value::get<Value>() const {
return *this;
}
template<>
inline bool& Value::get<Boolean>() {
JSONXX_ASSERT(is<Boolean>());
return bool_value_;
}
template<>
inline std::string& Value::get<String>() {
JSONXX_ASSERT(is<String>());
return *string_value_;
}
template<>
inline Number& Value::get<Number>() {
JSONXX_ASSERT(is<Number>());
return number_value_;
}
template<>
inline Array& Value::get<Array>() {
JSONXX_ASSERT(is<Array>());
return *array_value_;
}
template<>
inline Object& Value::get<Object>() {
JSONXX_ASSERT(is<Object>());
return *object_value_;
}
template<>
inline const Boolean& Value::get<Boolean>() const {
JSONXX_ASSERT(is<Boolean>());
return bool_value_;
}
template<>
inline const String& Value::get<String>() const {
JSONXX_ASSERT(is<String>());
return *string_value_;
}
template<>
inline const Number& Value::get<Number>() const {
JSONXX_ASSERT(is<Number>());
return number_value_;
}
template<>
inline const Array& Value::get<Array>() const {
JSONXX_ASSERT(is<Array>());
return *array_value_;
}
template<>
inline const Object& Value::get<Object>() const {
JSONXX_ASSERT(is<Object>());
return *object_value_;
}
template<typename T>
inline Object &Object::operator<<(const T &value) {
*this << Value(value);
return *this;
}
} // namespace jsonxx
std::ostream& operator<<(std::ostream& stream, const jsonxx::Value& v);
std::ostream& operator<<(std::ostream& stream, const jsonxx::Object& v);
std::ostream& operator<<(std::ostream& stream, const jsonxx::Array& v);
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