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json_value.cpp
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1707 lines (1543 loc) · 49.3 KB
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// Copyright 2011 Baptiste Lepilleur and The JsonCpp Authors
// Distributed under MIT license, or public domain if desired and
// recognized in your jurisdiction.
// See file LICENSE for detail or copy at http://jsoncpp.sourceforge.net/LICENSE
#if !defined(JSON_IS_AMALGAMATION)
#include <json/assertions.h>
#include <json/value.h>
#include <json/writer.h>
#endif // if !defined(JSON_IS_AMALGAMATION)
#include <cassert>
#include <cmath>
#include <cstring>
#include <sstream>
#include <utility>
#ifdef JSON_USE_CPPTL
#include <cpptl/conststring.h>
#endif
#include <algorithm> // min()
#include <cstddef> // size_t
// Provide implementation equivalent of std::snprintf for older _MSC compilers
#if defined(_MSC_VER) && _MSC_VER < 1900
#include <stdarg.h>
static int msvc_pre1900_c99_vsnprintf(char* outBuf,
size_t size,
const char* format,
va_list ap) {
int count = -1;
if (size != 0)
count = _vsnprintf_s(outBuf, size, _TRUNCATE, format, ap);
if (count == -1)
count = _vscprintf(format, ap);
return count;
}
int JSON_API msvc_pre1900_c99_snprintf(char* outBuf,
size_t size,
const char* format,
...) {
va_list ap;
va_start(ap, format);
const int count = msvc_pre1900_c99_vsnprintf(outBuf, size, format, ap);
va_end(ap);
return count;
}
#endif
// Disable warning C4702 : unreachable code
#if defined(_MSC_VER)
#pragma warning(disable : 4702)
#endif
#define JSON_ASSERT_UNREACHABLE assert(false)
namespace Json {
template <typename T>
static std::unique_ptr<T> cloneUnique(const std::unique_ptr<T>& p) {
std::unique_ptr<T> r;
if (p) {
r = std::unique_ptr<T>(new T(*p));
}
return r;
}
// This is a walkaround to avoid the static initialization of Value::null.
// kNull must be word-aligned to avoid crashing on ARM. We use an alignment of
// 8 (instead of 4) as a bit of future-proofing.
#if defined(__ARMEL__)
#define ALIGNAS(byte_alignment) __attribute__((aligned(byte_alignment)))
#else
#define ALIGNAS(byte_alignment)
#endif
// static const unsigned char ALIGNAS(8) kNull[sizeof(Value)] = { 0 };
// const unsigned char& kNullRef = kNull[0];
// const Value& Value::null = reinterpret_cast<const Value&>(kNullRef);
// const Value& Value::nullRef = null;
// static
Value const& Value::nullSingleton() {
static Value const nullStatic;
return nullStatic;
}
// for backwards compatibility, we'll leave these global references around, but
// DO NOT use them in JSONCPP library code any more!
Value const& Value::null = Value::nullSingleton();
Value const& Value::nullRef = Value::nullSingleton();
const Int Value::minInt = Int(~(UInt(-1) / 2));
const Int Value::maxInt = Int(UInt(-1) / 2);
const UInt Value::maxUInt = UInt(-1);
#if defined(JSON_HAS_INT64)
const Int64 Value::minInt64 = Int64(~(UInt64(-1) / 2));
const Int64 Value::maxInt64 = Int64(UInt64(-1) / 2);
const UInt64 Value::maxUInt64 = UInt64(-1);
// The constant is hard-coded because some compiler have trouble
// converting Value::maxUInt64 to a double correctly (AIX/xlC).
// Assumes that UInt64 is a 64 bits integer.
static const double maxUInt64AsDouble = 18446744073709551615.0;
#endif // defined(JSON_HAS_INT64)
const LargestInt Value::minLargestInt = LargestInt(~(LargestUInt(-1) / 2));
const LargestInt Value::maxLargestInt = LargestInt(LargestUInt(-1) / 2);
const LargestUInt Value::maxLargestUInt = LargestUInt(-1);
const UInt Value::defaultRealPrecision = 17;
#if !defined(JSON_USE_INT64_DOUBLE_CONVERSION)
template <typename T, typename U>
static inline bool InRange(double d, T min, U max) {
// The casts can lose precision, but we are looking only for
// an approximate range. Might fail on edge cases though. ~cdunn
// return d >= static_cast<double>(min) && d <= static_cast<double>(max);
return d >= min && d <= max;
}
#else // if !defined(JSON_USE_INT64_DOUBLE_CONVERSION)
static inline double integerToDouble(Json::UInt64 value) {
return static_cast<double>(Int64(value / 2)) * 2.0 +
static_cast<double>(Int64(value & 1));
}
template <typename T> static inline double integerToDouble(T value) {
return static_cast<double>(value);
}
template <typename T, typename U>
static inline bool InRange(double d, T min, U max) {
return d >= integerToDouble(min) && d <= integerToDouble(max);
}
#endif // if !defined(JSON_USE_INT64_DOUBLE_CONVERSION)
/** Duplicates the specified string value.
* @param value Pointer to the string to duplicate. Must be zero-terminated if
* length is "unknown".
* @param length Length of the value. if equals to unknown, then it will be
* computed using strlen(value).
* @return Pointer on the duplicate instance of string.
*/
static inline char* duplicateStringValue(const char* value, size_t length) {
// Avoid an integer overflow in the call to malloc below by limiting length
// to a sane value.
if (length >= static_cast<size_t>(Value::maxInt))
length = Value::maxInt - 1;
char* newString = static_cast<char*>(malloc(length + 1));
if (newString == nullptr) {
throwRuntimeError("in Json::Value::duplicateStringValue(): "
"Failed to allocate string value buffer");
}
memcpy(newString, value, length);
newString[length] = 0;
return newString;
}
/* Record the length as a prefix.
*/
static inline char* duplicateAndPrefixStringValue(const char* value,
unsigned int length) {
// Avoid an integer overflow in the call to malloc below by limiting length
// to a sane value.
JSON_ASSERT_MESSAGE(length <= static_cast<unsigned>(Value::maxInt) -
sizeof(unsigned) - 1U,
"in Json::Value::duplicateAndPrefixStringValue(): "
"length too big for prefixing");
unsigned actualLength = length + static_cast<unsigned>(sizeof(unsigned)) + 1U;
char* newString = static_cast<char*>(malloc(actualLength));
if (newString == nullptr) {
throwRuntimeError("in Json::Value::duplicateAndPrefixStringValue(): "
"Failed to allocate string value buffer");
}
*reinterpret_cast<unsigned*>(newString) = length;
memcpy(newString + sizeof(unsigned), value, length);
newString[actualLength - 1U] =
0; // to avoid buffer over-run accidents by users later
return newString;
}
inline static void decodePrefixedString(bool isPrefixed,
char const* prefixed,
unsigned* length,
char const** value) {
if (!isPrefixed) {
*length = static_cast<unsigned>(strlen(prefixed));
*value = prefixed;
} else {
*length = *reinterpret_cast<unsigned const*>(prefixed);
*value = prefixed + sizeof(unsigned);
}
}
/** Free the string duplicated by
* duplicateStringValue()/duplicateAndPrefixStringValue().
*/
#if JSONCPP_USING_SECURE_MEMORY
static inline void releasePrefixedStringValue(char* value) {
unsigned length = 0;
char const* valueDecoded;
decodePrefixedString(true, value, &length, &valueDecoded);
size_t const size = sizeof(unsigned) + length + 1U;
memset(value, 0, size);
free(value);
}
static inline void releaseStringValue(char* value, unsigned length) {
// length==0 => we allocated the strings memory
size_t size = (length == 0) ? strlen(value) : length;
memset(value, 0, size);
free(value);
}
#else // !JSONCPP_USING_SECURE_MEMORY
static inline void releasePrefixedStringValue(char* value) { free(value); }
static inline void releaseStringValue(char* value, unsigned) { free(value); }
#endif // JSONCPP_USING_SECURE_MEMORY
} // namespace Json
// //////////////////////////////////////////////////////////////////
// //////////////////////////////////////////////////////////////////
// //////////////////////////////////////////////////////////////////
// ValueInternals...
// //////////////////////////////////////////////////////////////////
// //////////////////////////////////////////////////////////////////
// //////////////////////////////////////////////////////////////////
#if !defined(JSON_IS_AMALGAMATION)
#include "json_valueiterator.inl"
#endif // if !defined(JSON_IS_AMALGAMATION)
namespace Json {
#if JSON_USE_EXCEPTION
Exception::Exception(String msg) : msg_(std::move(msg)) {}
Exception::~Exception() JSONCPP_NOEXCEPT {}
char const* Exception::what() const JSONCPP_NOEXCEPT { return msg_.c_str(); }
RuntimeError::RuntimeError(String const& msg) : Exception(msg) {}
LogicError::LogicError(String const& msg) : Exception(msg) {}
JSONCPP_NORETURN void throwRuntimeError(String const& msg) {
throw RuntimeError(msg);
}
JSONCPP_NORETURN void throwLogicError(String const& msg) {
throw LogicError(msg);
}
#else // !JSON_USE_EXCEPTION
JSONCPP_NORETURN void throwRuntimeError(String const& msg) { abort(); }
JSONCPP_NORETURN void throwLogicError(String const& msg) { abort(); }
#endif
// //////////////////////////////////////////////////////////////////
// //////////////////////////////////////////////////////////////////
// //////////////////////////////////////////////////////////////////
// class Value::CZString
// //////////////////////////////////////////////////////////////////
// //////////////////////////////////////////////////////////////////
// //////////////////////////////////////////////////////////////////
// Notes: policy_ indicates if the string was allocated when
// a string is stored.
Value::CZString::CZString(ArrayIndex index) : cstr_(nullptr), index_(index) {}
Value::CZString::CZString(char const* str,
unsigned length,
DuplicationPolicy allocate)
: cstr_(str) {
// allocate != duplicate
storage_.policy_ = allocate & 0x3;
storage_.length_ = length & 0x3FFFFFFF;
}
Value::CZString::CZString(const CZString& other) {
cstr_ = (other.storage_.policy_ != noDuplication && other.cstr_ != nullptr
? duplicateStringValue(other.cstr_, other.storage_.length_)
: other.cstr_);
storage_.policy_ =
static_cast<unsigned>(
other.cstr_
? (static_cast<DuplicationPolicy>(other.storage_.policy_) ==
noDuplication
? noDuplication
: duplicate)
: static_cast<DuplicationPolicy>(other.storage_.policy_)) &
3U;
storage_.length_ = other.storage_.length_;
}
Value::CZString::CZString(CZString&& other)
: cstr_(other.cstr_), index_(other.index_) {
other.cstr_ = nullptr;
}
Value::CZString::~CZString() {
if (cstr_ && storage_.policy_ == duplicate) {
releaseStringValue(const_cast<char*>(cstr_),
storage_.length_ + 1u); // +1 for null terminating
// character for sake of
// completeness but not actually
// necessary
}
}
void Value::CZString::swap(CZString& other) {
std::swap(cstr_, other.cstr_);
std::swap(index_, other.index_);
}
Value::CZString& Value::CZString::operator=(const CZString& other) {
cstr_ = other.cstr_;
index_ = other.index_;
return *this;
}
Value::CZString& Value::CZString::operator=(CZString&& other) {
cstr_ = other.cstr_;
index_ = other.index_;
other.cstr_ = nullptr;
return *this;
}
bool Value::CZString::operator<(const CZString& other) const {
if (!cstr_)
return index_ < other.index_;
// return strcmp(cstr_, other.cstr_) < 0;
// Assume both are strings.
unsigned this_len = this->storage_.length_;
unsigned other_len = other.storage_.length_;
unsigned min_len = std::min<unsigned>(this_len, other_len);
JSON_ASSERT(this->cstr_ && other.cstr_);
int comp = memcmp(this->cstr_, other.cstr_, min_len);
if (comp < 0)
return true;
if (comp > 0)
return false;
return (this_len < other_len);
}
bool Value::CZString::operator==(const CZString& other) const {
if (!cstr_)
return index_ == other.index_;
// return strcmp(cstr_, other.cstr_) == 0;
// Assume both are strings.
unsigned this_len = this->storage_.length_;
unsigned other_len = other.storage_.length_;
if (this_len != other_len)
return false;
JSON_ASSERT(this->cstr_ && other.cstr_);
int comp = memcmp(this->cstr_, other.cstr_, this_len);
return comp == 0;
}
ArrayIndex Value::CZString::index() const { return index_; }
// const char* Value::CZString::c_str() const { return cstr_; }
const char* Value::CZString::data() const { return cstr_; }
unsigned Value::CZString::length() const { return storage_.length_; }
bool Value::CZString::isStaticString() const {
return storage_.policy_ == noDuplication;
}
// //////////////////////////////////////////////////////////////////
// //////////////////////////////////////////////////////////////////
// //////////////////////////////////////////////////////////////////
// class Value::Value
// //////////////////////////////////////////////////////////////////
// //////////////////////////////////////////////////////////////////
// //////////////////////////////////////////////////////////////////
/*! \internal Default constructor initialization must be equivalent to:
* memset( this, 0, sizeof(Value) )
* This optimization is used in ValueInternalMap fast allocator.
*/
Value::Value(ValueType type) {
static char const emptyString[] = "";
initBasic(type);
switch (type) {
case nullValue:
break;
case intValue:
case uintValue:
value_.int_ = 0;
break;
case realValue:
value_.real_ = 0.0;
break;
case stringValue:
// allocated_ == false, so this is safe.
value_.string_ = const_cast<char*>(static_cast<char const*>(emptyString));
break;
case arrayValue:
case objectValue:
value_.map_ = new ObjectValues();
break;
case booleanValue:
value_.bool_ = false;
break;
default:
JSON_ASSERT_UNREACHABLE;
}
}
Value::Value(Int value) {
initBasic(intValue);
value_.int_ = value;
}
Value::Value(UInt value) {
initBasic(uintValue);
value_.uint_ = value;
}
#if defined(JSON_HAS_INT64)
Value::Value(Int64 value) {
initBasic(intValue);
value_.int_ = value;
}
Value::Value(UInt64 value) {
initBasic(uintValue);
value_.uint_ = value;
}
#endif // defined(JSON_HAS_INT64)
Value::Value(double value) {
initBasic(realValue);
value_.real_ = value;
}
Value::Value(const char* value) {
initBasic(stringValue, true);
JSON_ASSERT_MESSAGE(value != nullptr,
"Null Value Passed to Value Constructor");
value_.string_ = duplicateAndPrefixStringValue(
value, static_cast<unsigned>(strlen(value)));
}
Value::Value(const char* begin, const char* end) {
initBasic(stringValue, true);
value_.string_ =
duplicateAndPrefixStringValue(begin, static_cast<unsigned>(end - begin));
}
Value::Value(const String& value) {
initBasic(stringValue, true);
value_.string_ = duplicateAndPrefixStringValue(
value.data(), static_cast<unsigned>(value.length()));
}
Value::Value(const StaticString& value) {
initBasic(stringValue);
value_.string_ = const_cast<char*>(value.c_str());
}
#ifdef JSON_USE_CPPTL
Value::Value(const CppTL::ConstString& value) {
initBasic(stringValue, true);
value_.string_ = duplicateAndPrefixStringValue(
value, static_cast<unsigned>(value.length()));
}
#endif
Value::Value(bool value) {
initBasic(booleanValue);
value_.bool_ = value;
}
Value::Value(const Value& other) {
dupPayload(other);
dupMeta(other);
}
Value::Value(Value&& other) {
initBasic(nullValue);
swap(other);
}
Value::~Value() {
releasePayload();
value_.uint_ = 0;
}
Value& Value::operator=(const Value& other) {
Value(other).swap(*this);
return *this;
}
Value& Value::operator=(Value&& other) {
other.swap(*this);
return *this;
}
void Value::swapPayload(Value& other) {
std::swap(bits_, other.bits_);
std::swap(value_, other.value_);
}
void Value::copyPayload(const Value& other) {
releasePayload();
dupPayload(other);
}
void Value::swap(Value& other) {
swapPayload(other);
std::swap(comments_, other.comments_);
std::swap(start_, other.start_);
std::swap(limit_, other.limit_);
}
void Value::copy(const Value& other) {
copyPayload(other);
dupMeta(other);
}
ValueType Value::type() const {
return static_cast<ValueType>(bits_.value_type_);
}
int Value::compare(const Value& other) const {
if (*this < other)
return -1;
if (*this > other)
return 1;
return 0;
}
bool Value::operator<(const Value& other) const {
int typeDelta = type() - other.type();
if (typeDelta)
return typeDelta < 0 ? true : false;
switch (type()) {
case nullValue:
return false;
case intValue:
return value_.int_ < other.value_.int_;
case uintValue:
return value_.uint_ < other.value_.uint_;
case realValue:
return value_.real_ < other.value_.real_;
case booleanValue:
return value_.bool_ < other.value_.bool_;
case stringValue: {
if ((value_.string_ == nullptr) || (other.value_.string_ == nullptr)) {
if (other.value_.string_)
return true;
else
return false;
}
unsigned this_len;
unsigned other_len;
char const* this_str;
char const* other_str;
decodePrefixedString(this->isAllocated(), this->value_.string_, &this_len,
&this_str);
decodePrefixedString(other.isAllocated(), other.value_.string_, &other_len,
&other_str);
unsigned min_len = std::min<unsigned>(this_len, other_len);
JSON_ASSERT(this_str && other_str);
int comp = memcmp(this_str, other_str, min_len);
if (comp < 0)
return true;
if (comp > 0)
return false;
return (this_len < other_len);
}
case arrayValue:
case objectValue: {
int delta = int(value_.map_->size() - other.value_.map_->size());
if (delta)
return delta < 0;
return (*value_.map_) < (*other.value_.map_);
}
default:
JSON_ASSERT_UNREACHABLE;
}
return false; // unreachable
}
bool Value::operator<=(const Value& other) const { return !(other < *this); }
bool Value::operator>=(const Value& other) const { return !(*this < other); }
bool Value::operator>(const Value& other) const { return other < *this; }
bool Value::operator==(const Value& other) const {
if (type() != other.type())
return false;
switch (type()) {
case nullValue:
return true;
case intValue:
return value_.int_ == other.value_.int_;
case uintValue:
return value_.uint_ == other.value_.uint_;
case realValue:
return value_.real_ == other.value_.real_;
case booleanValue:
return value_.bool_ == other.value_.bool_;
case stringValue: {
if ((value_.string_ == nullptr) || (other.value_.string_ == nullptr)) {
return (value_.string_ == other.value_.string_);
}
unsigned this_len;
unsigned other_len;
char const* this_str;
char const* other_str;
decodePrefixedString(this->isAllocated(), this->value_.string_, &this_len,
&this_str);
decodePrefixedString(other.isAllocated(), other.value_.string_, &other_len,
&other_str);
if (this_len != other_len)
return false;
JSON_ASSERT(this_str && other_str);
int comp = memcmp(this_str, other_str, this_len);
return comp == 0;
}
case arrayValue:
case objectValue:
return value_.map_->size() == other.value_.map_->size() &&
(*value_.map_) == (*other.value_.map_);
default:
JSON_ASSERT_UNREACHABLE;
}
return false; // unreachable
}
bool Value::operator!=(const Value& other) const { return !(*this == other); }
const char* Value::asCString() const {
JSON_ASSERT_MESSAGE(type() == stringValue,
"in Json::Value::asCString(): requires stringValue");
if (value_.string_ == nullptr)
return nullptr;
unsigned this_len;
char const* this_str;
decodePrefixedString(this->isAllocated(), this->value_.string_, &this_len,
&this_str);
return this_str;
}
#if JSONCPP_USING_SECURE_MEMORY
unsigned Value::getCStringLength() const {
JSON_ASSERT_MESSAGE(type() == stringValue,
"in Json::Value::asCString(): requires stringValue");
if (value_.string_ == 0)
return 0;
unsigned this_len;
char const* this_str;
decodePrefixedString(this->isAllocated(), this->value_.string_, &this_len,
&this_str);
return this_len;
}
#endif
bool Value::getString(char const** begin, char const** end) const {
if (type() != stringValue)
return false;
if (value_.string_ == nullptr)
return false;
unsigned length;
decodePrefixedString(this->isAllocated(), this->value_.string_, &length,
begin);
*end = *begin + length;
return true;
}
String Value::asString() const {
switch (type()) {
case nullValue:
return "";
case stringValue: {
if (value_.string_ == nullptr)
return "";
unsigned this_len;
char const* this_str;
decodePrefixedString(this->isAllocated(), this->value_.string_, &this_len,
&this_str);
return String(this_str, this_len);
}
case booleanValue:
return value_.bool_ ? "true" : "false";
case intValue:
return valueToString(value_.int_);
case uintValue:
return valueToString(value_.uint_);
case realValue:
return valueToString(value_.real_);
default:
JSON_FAIL_MESSAGE("Type is not convertible to string");
}
}
#ifdef JSON_USE_CPPTL
CppTL::ConstString Value::asConstString() const {
unsigned len;
char const* str;
decodePrefixedString(isAllocated(), value_.string_, &len, &str);
return CppTL::ConstString(str, len);
}
#endif
Value::Int Value::asInt() const {
switch (type()) {
case intValue:
JSON_ASSERT_MESSAGE(isInt(), "LargestInt out of Int range");
return Int(value_.int_);
case uintValue:
JSON_ASSERT_MESSAGE(isInt(), "LargestUInt out of Int range");
return Int(value_.uint_);
case realValue:
JSON_ASSERT_MESSAGE(InRange(value_.real_, minInt, maxInt),
"double out of Int range");
return Int(value_.real_);
case nullValue:
return 0;
case booleanValue:
return value_.bool_ ? 1 : 0;
default:
break;
}
JSON_FAIL_MESSAGE("Value is not convertible to Int.");
}
Value::UInt Value::asUInt() const {
switch (type()) {
case intValue:
JSON_ASSERT_MESSAGE(isUInt(), "LargestInt out of UInt range");
return UInt(value_.int_);
case uintValue:
JSON_ASSERT_MESSAGE(isUInt(), "LargestUInt out of UInt range");
return UInt(value_.uint_);
case realValue:
JSON_ASSERT_MESSAGE(InRange(value_.real_, 0, maxUInt),
"double out of UInt range");
return UInt(value_.real_);
case nullValue:
return 0;
case booleanValue:
return value_.bool_ ? 1 : 0;
default:
break;
}
JSON_FAIL_MESSAGE("Value is not convertible to UInt.");
}
#if defined(JSON_HAS_INT64)
Value::Int64 Value::asInt64() const {
switch (type()) {
case intValue:
return Int64(value_.int_);
case uintValue:
JSON_ASSERT_MESSAGE(isInt64(), "LargestUInt out of Int64 range");
return Int64(value_.uint_);
case realValue:
JSON_ASSERT_MESSAGE(InRange(value_.real_, minInt64, maxInt64),
"double out of Int64 range");
return Int64(value_.real_);
case nullValue:
return 0;
case booleanValue:
return value_.bool_ ? 1 : 0;
default:
break;
}
JSON_FAIL_MESSAGE("Value is not convertible to Int64.");
}
Value::UInt64 Value::asUInt64() const {
switch (type()) {
case intValue:
JSON_ASSERT_MESSAGE(isUInt64(), "LargestInt out of UInt64 range");
return UInt64(value_.int_);
case uintValue:
return UInt64(value_.uint_);
case realValue:
JSON_ASSERT_MESSAGE(InRange(value_.real_, 0, maxUInt64),
"double out of UInt64 range");
return UInt64(value_.real_);
case nullValue:
return 0;
case booleanValue:
return value_.bool_ ? 1 : 0;
default:
break;
}
JSON_FAIL_MESSAGE("Value is not convertible to UInt64.");
}
#endif // if defined(JSON_HAS_INT64)
LargestInt Value::asLargestInt() const {
#if defined(JSON_NO_INT64)
return asInt();
#else
return asInt64();
#endif
}
LargestUInt Value::asLargestUInt() const {
#if defined(JSON_NO_INT64)
return asUInt();
#else
return asUInt64();
#endif
}
double Value::asDouble() const {
switch (type()) {
case intValue:
return static_cast<double>(value_.int_);
case uintValue:
#if !defined(JSON_USE_INT64_DOUBLE_CONVERSION)
return static_cast<double>(value_.uint_);
#else // if !defined(JSON_USE_INT64_DOUBLE_CONVERSION)
return integerToDouble(value_.uint_);
#endif // if !defined(JSON_USE_INT64_DOUBLE_CONVERSION)
case realValue:
return value_.real_;
case nullValue:
return 0.0;
case booleanValue:
return value_.bool_ ? 1.0 : 0.0;
default:
break;
}
JSON_FAIL_MESSAGE("Value is not convertible to double.");
}
float Value::asFloat() const {
switch (type()) {
case intValue:
return static_cast<float>(value_.int_);
case uintValue:
#if !defined(JSON_USE_INT64_DOUBLE_CONVERSION)
return static_cast<float>(value_.uint_);
#else // if !defined(JSON_USE_INT64_DOUBLE_CONVERSION)
// This can fail (silently?) if the value is bigger than MAX_FLOAT.
return static_cast<float>(integerToDouble(value_.uint_));
#endif // if !defined(JSON_USE_INT64_DOUBLE_CONVERSION)
case realValue:
return static_cast<float>(value_.real_);
case nullValue:
return 0.0;
case booleanValue:
return value_.bool_ ? 1.0f : 0.0f;
default:
break;
}
JSON_FAIL_MESSAGE("Value is not convertible to float.");
}
bool Value::asBool() const {
switch (type()) {
case booleanValue:
return value_.bool_;
case nullValue:
return false;
case intValue:
return value_.int_ ? true : false;
case uintValue:
return value_.uint_ ? true : false;
case realValue: {
// According to JavaScript language zero or NaN is regarded as false
const auto value_classification = std::fpclassify(value_.real_);
return value_classification != FP_ZERO && value_classification != FP_NAN;
}
default:
break;
}
JSON_FAIL_MESSAGE("Value is not convertible to bool.");
}
bool Value::isConvertibleTo(ValueType other) const {
switch (other) {
case nullValue:
return (isNumeric() && asDouble() == 0.0) ||
(type() == booleanValue && value_.bool_ == false) ||
(type() == stringValue && asString().empty()) ||
(type() == arrayValue && value_.map_->empty()) ||
(type() == objectValue && value_.map_->empty()) ||
type() == nullValue;
case intValue:
return isInt() ||
(type() == realValue && InRange(value_.real_, minInt, maxInt)) ||
type() == booleanValue || type() == nullValue;
case uintValue:
return isUInt() ||
(type() == realValue && InRange(value_.real_, 0, maxUInt)) ||
type() == booleanValue || type() == nullValue;
case realValue:
return isNumeric() || type() == booleanValue || type() == nullValue;
case booleanValue:
return isNumeric() || type() == booleanValue || type() == nullValue;
case stringValue:
return isNumeric() || type() == booleanValue || type() == stringValue ||
type() == nullValue;
case arrayValue:
return type() == arrayValue || type() == nullValue;
case objectValue:
return type() == objectValue || type() == nullValue;
}
JSON_ASSERT_UNREACHABLE;
return false;
}
/// Number of values in array or object
ArrayIndex Value::size() const {
switch (type()) {
case nullValue:
case intValue:
case uintValue:
case realValue:
case booleanValue:
case stringValue:
return 0;
case arrayValue: // size of the array is highest index + 1
if (!value_.map_->empty()) {
ObjectValues::const_iterator itLast = value_.map_->end();
--itLast;
return (*itLast).first.index() + 1;
}
return 0;
case objectValue:
return ArrayIndex(value_.map_->size());
}
JSON_ASSERT_UNREACHABLE;
return 0; // unreachable;
}
bool Value::empty() const {
if (isNull() || isArray() || isObject())
return size() == 0u;
else
return false;
}
Value::operator bool() const { return !isNull(); }
void Value::clear() {
JSON_ASSERT_MESSAGE(type() == nullValue || type() == arrayValue ||
type() == objectValue,
"in Json::Value::clear(): requires complex value");
start_ = 0;
limit_ = 0;
switch (type()) {
case arrayValue:
case objectValue:
value_.map_->clear();
break;
default:
break;
}
}
void Value::resize(ArrayIndex newSize) {
JSON_ASSERT_MESSAGE(type() == nullValue || type() == arrayValue,
"in Json::Value::resize(): requires arrayValue");
if (type() == nullValue)
*this = Value(arrayValue);
ArrayIndex oldSize = size();
if (newSize == 0)
clear();
else if (newSize > oldSize)
this->operator[](newSize - 1);
else {
for (ArrayIndex index = newSize; index < oldSize; ++index) {
value_.map_->erase(index);
}
JSON_ASSERT(size() == newSize);
}
}
Value& Value::operator[](ArrayIndex index) {
JSON_ASSERT_MESSAGE(
type() == nullValue || type() == arrayValue,
"in Json::Value::operator[](ArrayIndex): requires arrayValue");
if (type() == nullValue)
*this = Value(arrayValue);
CZString key(index);
auto it = value_.map_->lower_bound(key);
if (it != value_.map_->end() && (*it).first == key)
return (*it).second;
ObjectValues::value_type defaultValue(key, nullSingleton());
it = value_.map_->insert(it, defaultValue);
return (*it).second;
}
Value& Value::operator[](int index) {
JSON_ASSERT_MESSAGE(
index >= 0,
"in Json::Value::operator[](int index): index cannot be negative");
return (*this)[ArrayIndex(index)];
}
const Value& Value::operator[](ArrayIndex index) const {
JSON_ASSERT_MESSAGE(
type() == nullValue || type() == arrayValue,
"in Json::Value::operator[](ArrayIndex)const: requires arrayValue");
if (type() == nullValue)
return nullSingleton();
CZString key(index);
ObjectValues::const_iterator it = value_.map_->find(key);
if (it == value_.map_->end())
return nullSingleton();
return (*it).second;
}