json_value.cpp

// Copyright 2011 Baptiste Lepilleur
// 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"
#ifndef JSON_USE_SIMPLE_INTERNAL_ALLOCATOR
#include "json_batchallocator.h"
#endif // #ifndef JSON_USE_SIMPLE_INTERNAL_ALLOCATOR
#endif // if !defined(JSON_IS_AMALGAMATION)
#include <math.h>
#include <sstream>
#include <utility>
#include <cstring>
#include <cassert>
#ifdef JSON_USE_CPPTL
#include <cpptl/conststring.h>
#endif
#include <cstddef> // size_t

#define JSON_ASSERT_UNREACHABLE assert(false)

namespace Json {

// 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 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);

/// Unknown size marker
static const unsigned int unknown = (unsigned)-1;

#if !defined(JSON_USE_INT64_DOUBLE_CONVERSION)
template <typename T, typename U>
static inline bool InRange(double d, T min, U 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 + 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,
                                         unsigned int length = unknown) {
  if (length == unknown)
    length = (unsigned int)strlen(value);

  // Avoid an integer overflow in the call to malloc below by limiting length
  // to a sane value.
  if (length >= (unsigned)Value::maxInt)
    length = Value::maxInt - 1;

  char* newString = static_cast<char*>(malloc(length + 1));
  JSON_ASSERT_MESSAGE(newString != 0,
                      "in Json::Value::duplicateStringValue(): "
                      "Failed to allocate string value buffer");
  memcpy(newString, value, length);
  newString[length] = 0;
  return newString;
}

/** Free the string duplicated by duplicateStringValue().
 */
static inline void releaseStringValue(char* value) { free(value); }

} // namespace Json

// //////////////////////////////////////////////////////////////////
// //////////////////////////////////////////////////////////////////
// //////////////////////////////////////////////////////////////////
// ValueInternals...
// //////////////////////////////////////////////////////////////////
// //////////////////////////////////////////////////////////////////
// //////////////////////////////////////////////////////////////////
#if !defined(JSON_IS_AMALGAMATION)
#ifdef JSON_VALUE_USE_INTERNAL_MAP
#include "json_internalarray.inl"
#include "json_internalmap.inl"
#endif // JSON_VALUE_USE_INTERNAL_MAP

#include "json_valueiterator.inl"
#endif // if !defined(JSON_IS_AMALGAMATION)

namespace Json {

// //////////////////////////////////////////////////////////////////
// //////////////////////////////////////////////////////////////////
// //////////////////////////////////////////////////////////////////
// class Value::CommentInfo
// //////////////////////////////////////////////////////////////////
// //////////////////////////////////////////////////////////////////
// //////////////////////////////////////////////////////////////////

Value::CommentInfo::CommentInfo() : comment_(0) {}

Value::CommentInfo::~CommentInfo() {
  if (comment_)
    releaseStringValue(comment_);
}

void Value::CommentInfo::setComment(const char* text) {
  if (comment_)
    releaseStringValue(comment_);
  JSON_ASSERT(text != 0);
  JSON_ASSERT_MESSAGE(
      text[0] == '\0' || text[0] == '/',
      "in Json::Value::setComment(): Comments must start with /");
  // It seems that /**/ style comments are acceptable as well.
  comment_ = duplicateStringValue(text);
}

// //////////////////////////////////////////////////////////////////
// //////////////////////////////////////////////////////////////////
// //////////////////////////////////////////////////////////////////
// class Value::CZString
// //////////////////////////////////////////////////////////////////
// //////////////////////////////////////////////////////////////////
// //////////////////////////////////////////////////////////////////
#ifndef JSON_VALUE_USE_INTERNAL_MAP

// Notes: index_ indicates if the string was allocated when
// a string is stored.

Value::CZString::CZString(ArrayIndex index) : cstr_(0), index_(index) {}

Value::CZString::CZString(const char* cstr, DuplicationPolicy allocate)
    : cstr_(allocate == duplicate ? duplicateStringValue(cstr) : cstr),
      index_(allocate) {}

Value::CZString::CZString(const CZString& other)
    : cstr_(other.index_ != noDuplication && other.cstr_ != 0
                ? duplicateStringValue(other.cstr_)
                : other.cstr_),
      index_(other.cstr_
                 ? (other.index_ == noDuplication ? noDuplication : duplicate)
                 : other.index_) {}

Value::CZString::~CZString() {
  if (cstr_ && index_ == duplicate)
    releaseStringValue(const_cast<char*>(cstr_));
}

void Value::CZString::swap(CZString& other) {
  std::swap(cstr_, other.cstr_);
  std::swap(index_, other.index_);
}

Value::CZString& Value::CZString::operator=(CZString other) {
  swap(other);
  return *this;
}

bool Value::CZString::operator<(const CZString& other) const {
  if (cstr_)
    return strcmp(cstr_, other.cstr_) < 0;
  return index_ < other.index_;
}

bool Value::CZString::operator==(const CZString& other) const {
  if (cstr_)
    return strcmp(cstr_, other.cstr_) == 0;
  return index_ == other.index_;
}

ArrayIndex Value::CZString::index() const { return index_; }

const char* Value::CZString::c_str() const { return cstr_; }

bool Value::CZString::isStaticString() const { return index_ == noDuplication; }

#endif // ifndef JSON_VALUE_USE_INTERNAL_MAP

// //////////////////////////////////////////////////////////////////
// //////////////////////////////////////////////////////////////////
// //////////////////////////////////////////////////////////////////
// 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)
    : type_(type), allocated_(false)
#ifdef JSON_VALUE_USE_INTERNAL_MAP
      ,
      itemIsUsed_(0)
#endif
      ,
      comments_(0), start_(0), limit_(0) {
  switch (type) {
  case nullValue:
    break;
  case intValue:
  case uintValue:
    value_.int_ = 0;
    break;
  case realValue:
    value_.real_ = 0.0;
    break;
  case stringValue:
    value_.string_ = 0;
    break;
#ifndef JSON_VALUE_USE_INTERNAL_MAP
  case arrayValue:
  case objectValue:
    value_.map_ = new ObjectValues();
    break;
#else
  case arrayValue:
    value_.array_ = arrayAllocator()->newArray();
    break;
  case objectValue:
    value_.map_ = mapAllocator()->newMap();
    break;
#endif
  case booleanValue:
    value_.bool_ = false;
    break;
  default:
    JSON_ASSERT_UNREACHABLE;
  }
}

Value::Value(UInt value)
    : type_(uintValue), allocated_(false)
#ifdef JSON_VALUE_USE_INTERNAL_MAP
      ,
      itemIsUsed_(0)
#endif
      ,
      comments_(0), start_(0), limit_(0) {
  value_.uint_ = value;
}

Value::Value(Int value)
    : type_(intValue), allocated_(false)
#ifdef JSON_VALUE_USE_INTERNAL_MAP
      ,
      itemIsUsed_(0)
#endif
      ,
      comments_(0), start_(0), limit_(0) {
  value_.int_ = value;
}

#if defined(JSON_HAS_INT64)
Value::Value(Int64 value)
    : type_(intValue), allocated_(false)
#ifdef JSON_VALUE_USE_INTERNAL_MAP
      ,
      itemIsUsed_(0)
#endif
      ,
      comments_(0), start_(0), limit_(0) {
  value_.int_ = value;
}

Value::Value(UInt64 value)
    : type_(uintValue), allocated_(false)
#ifdef JSON_VALUE_USE_INTERNAL_MAP
      ,
      itemIsUsed_(0)
#endif
      ,
      comments_(0), start_(0), limit_(0) {
  value_.uint_ = value;
}
#endif // defined(JSON_HAS_INT64)

Value::Value(double value)
    : type_(realValue), allocated_(false)
#ifdef JSON_VALUE_USE_INTERNAL_MAP
      ,
      itemIsUsed_(0)
#endif
      ,
      comments_(0), start_(0), limit_(0) {
  value_.real_ = value;
}

Value::Value(const char* value)
    : type_(stringValue), allocated_(true)
#ifdef JSON_VALUE_USE_INTERNAL_MAP
      ,
      itemIsUsed_(0)
#endif
      ,
      comments_(0), start_(0), limit_(0) {
  value_.string_ = duplicateStringValue(value);
}

Value::Value(const char* beginValue, const char* endValue)
    : type_(stringValue), allocated_(true)
#ifdef JSON_VALUE_USE_INTERNAL_MAP
      ,
      itemIsUsed_(0)
#endif
      ,
      comments_(0), start_(0), limit_(0) {
  value_.string_ =
      duplicateStringValue(beginValue, (unsigned int)(endValue - beginValue));
}

Value::Value(const std::string& value)
    : type_(stringValue), allocated_(true)
#ifdef JSON_VALUE_USE_INTERNAL_MAP
      ,
      itemIsUsed_(0)
#endif
      ,
      comments_(0), start_(0), limit_(0) {
  value_.string_ =
      duplicateStringValue(value.c_str(), (unsigned int)value.length());
}

Value::Value(const StaticString& value)
    : type_(stringValue), allocated_(false)
#ifdef JSON_VALUE_USE_INTERNAL_MAP
      ,
      itemIsUsed_(0)
#endif
      ,
      comments_(0), start_(0), limit_(0) {
  value_.string_ = const_cast<char*>(value.c_str());
}

#ifdef JSON_USE_CPPTL
Value::Value(const CppTL::ConstString& value)
    : type_(stringValue), allocated_(true)
#ifdef JSON_VALUE_USE_INTERNAL_MAP
      ,
      itemIsUsed_(0)
#endif
      ,
      comments_(0), start_(0), limit_(0) {
  value_.string_ = duplicateStringValue(value, value.length());
}
#endif

Value::Value(bool value)
    : type_(booleanValue), allocated_(false)
#ifdef JSON_VALUE_USE_INTERNAL_MAP
      ,
      itemIsUsed_(0)
#endif
      ,
      comments_(0), start_(0), limit_(0) {
  value_.bool_ = value;
}

Value::Value(const Value& other)
    : type_(other.type_), allocated_(false)
#ifdef JSON_VALUE_USE_INTERNAL_MAP
      ,
      itemIsUsed_(0)
#endif
      ,
      comments_(0), start_(other.start_), limit_(other.limit_) {
  switch (type_) {
  case nullValue:
  case intValue:
  case uintValue:
  case realValue:
  case booleanValue:
    value_ = other.value_;
    break;
  case stringValue:
    if (other.value_.string_) {
      value_.string_ = duplicateStringValue(other.value_.string_);
      allocated_ = true;
    } else {
      value_.string_ = 0;
      allocated_ = false;
    }
    break;
#ifndef JSON_VALUE_USE_INTERNAL_MAP
  case arrayValue:
  case objectValue:
    value_.map_ = new ObjectValues(*other.value_.map_);
    break;
#else
  case arrayValue:
    value_.array_ = arrayAllocator()->newArrayCopy(*other.value_.array_);
    break;
  case objectValue:
    value_.map_ = mapAllocator()->newMapCopy(*other.value_.map_);
    break;
#endif
  default:
    JSON_ASSERT_UNREACHABLE;
  }
  if (other.comments_) {
    comments_ = new CommentInfo[numberOfCommentPlacement];
    for (int comment = 0; comment < numberOfCommentPlacement; ++comment) {
      const CommentInfo& otherComment = other.comments_[comment];
      if (otherComment.comment_)
        comments_[comment].setComment(otherComment.comment_);
    }
  }
}

Value::~Value() {
  switch (type_) {
  case nullValue:
  case intValue:
  case uintValue:
  case realValue:
  case booleanValue:
    break;
  case stringValue:
    if (allocated_)
      releaseStringValue(value_.string_);
    break;
#ifndef JSON_VALUE_USE_INTERNAL_MAP
  case arrayValue:
  case objectValue:
    delete value_.map_;
    break;
#else
  case arrayValue:
    arrayAllocator()->destructArray(value_.array_);
    break;
  case objectValue:
    mapAllocator()->destructMap(value_.map_);
    break;
#endif
  default:
    JSON_ASSERT_UNREACHABLE;
  }

  if (comments_)
    delete[] comments_;
}

Value& Value::operator=(Value other) {
  swap(other);
  return *this;
}

void Value::swap(Value& other) {
  ValueType temp = type_;
  type_ = other.type_;
  other.type_ = temp;
  std::swap(value_, other.value_);
  int temp2 = allocated_;
  allocated_ = other.allocated_;
  other.allocated_ = temp2;
  std::swap(start_, other.start_);
  std::swap(limit_, other.limit_);
}

ValueType Value::type() const { return 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:
    return (value_.string_ == 0 && other.value_.string_) ||
           (other.value_.string_ && value_.string_ &&
            strcmp(value_.string_, other.value_.string_) < 0);
#ifndef JSON_VALUE_USE_INTERNAL_MAP
  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_);
  }
#else
  case arrayValue:
    return value_.array_->compare(*(other.value_.array_)) < 0;
  case objectValue:
    return value_.map_->compare(*(other.value_.map_)) < 0;
#endif
  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_ )
  // GCC 2.95.3 says:
  // attempt to take address of bit-field structure member `Json::Value::type_'
  // Beats me, but a temp solves the problem.
  int temp = other.type_;
  if (type_ != temp)
    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:
    return (value_.string_ == other.value_.string_) ||
           (other.value_.string_ && value_.string_ &&
            strcmp(value_.string_, other.value_.string_) == 0);
#ifndef JSON_VALUE_USE_INTERNAL_MAP
  case arrayValue:
  case objectValue:
    return value_.map_->size() == other.value_.map_->size() &&
           (*value_.map_) == (*other.value_.map_);
#else
  case arrayValue:
    return value_.array_->compare(*(other.value_.array_)) == 0;
  case objectValue:
    return value_.map_->compare(*(other.value_.map_)) == 0;
#endif
  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");
  return value_.string_;
}

std::string Value::asString() const {
  switch (type_) {
  case nullValue:
    return "";
  case stringValue:
    return value_.string_ ? value_.string_ : "";
  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 {
  return CppTL::ConstString(asString().c_str());
}
#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)
    return 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:
    return value_.real_ ? true : false;
  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() == "") ||
           (type_ == arrayValue && value_.map_->size() == 0) ||
           (type_ == objectValue && value_.map_->size() == 0) ||
           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;
#ifndef JSON_VALUE_USE_INTERNAL_MAP
  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());
#else
  case arrayValue:
    return Int(value_.array_->size());
  case objectValue:
    return Int(value_.map_->size());
#endif
  }
  JSON_ASSERT_UNREACHABLE;
  return 0; // unreachable;
}

bool Value::empty() const {
  if (isNull() || isArray() || isObject())
    return size() == 0u;
  else
    return false;
}

bool Value::operator!() 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_) {
#ifndef JSON_VALUE_USE_INTERNAL_MAP
  case arrayValue:
  case objectValue:
    value_.map_->clear();
    break;
#else
  case arrayValue:
    value_.array_->clear();
    break;
  case objectValue:
    value_.map_->clear();
    break;
#endif
  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);
#ifndef JSON_VALUE_USE_INTERNAL_MAP
  ArrayIndex oldSize = size();
  if (newSize == 0)
    clear();
  else if (newSize > oldSize)
    (*this)[newSize - 1];
  else {
    for (ArrayIndex index = newSize; index < oldSize; ++index) {
      value_.map_->erase(index);
    }
    assert(size() == newSize);
  }
#else
  value_.array_->resize(newSize);
#endif
}

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);
#ifndef JSON_VALUE_USE_INTERNAL_MAP
  CZString key(index);
  ObjectValues::iterator it = value_.map_->lower_bound(key);
  if (it != value_.map_->end() && (*it).first == key)
    return (*it).second;

  ObjectValues::value_type defaultValue(key, null);
  it = value_.map_->insert(it, defaultValue);
  return (*it).second;
#else
  return value_.array_->resolveReference(index);
#endif
}

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 null;
#ifndef JSON_VALUE_USE_INTERNAL_MAP
  CZString key(index);
  ObjectValues::const_iterator it = value_.map_->find(key);
  if (it == value_.map_->end())
    return null;
  return (*it).second;
#else
  Value* value = value_.array_->find(index);
  return value ? *value : null;
#endif
}

const Value& Value::operator[](int index) const {
  JSON_ASSERT_MESSAGE(
      index >= 0,
      "in Json::Value::operator[](int index) const: index cannot be negative");
  return (*this)[ArrayIndex(index)];
}

Value& Value::operator[](const char* key) {
  return resolveReference(key, false);
}

Value& Value::resolveReference(const char* key, bool isStatic) {
  JSON_ASSERT_MESSAGE(
      type_ == nullValue || type_ == objectValue,
      "in Json::Value::resolveReference(): requires objectValue");
  if (type_ == nullValue)
    *this = Value(objectValue);
#ifndef JSON_VALUE_USE_INTERNAL_MAP
  CZString actualKey(
      key, isStatic ? CZString::noDuplication : CZString::duplicateOnCopy);
  ObjectValues::iterator it = value_.map_->lower_bound(actualKey);
  if (it != value_.map_->end() && (*it).first == actualKey)
    return (*it).second;

  ObjectValues::value_type defaultValue(actualKey, null);
  it = value_.map_->insert(it, defaultValue);
  Value& value = (*it).second;
  return value;
#else
  return value_.map_->resolveReference(key, isStatic);
#endif
}

Value Value::get(ArrayIndex index, const Value& defaultValue) const {
  const Value* value = &((*this)[index]);
  return value == &null ? defaultValue : *value;
}

bool Value::isValidIndex(ArrayIndex index) const { return index < size(); }

const Value& Value::operator[](const char* key) const {
  JSON_ASSERT_MESSAGE(
      type_ == nullValue || type_ == objectValue,
      "in Json::Value::operator[](char const*)const: requires objectValue");
  if (type_ == nullValue)
    return null;
#ifndef JSON_VALUE_USE_INTERNAL_MAP
  CZString actualKey(key, CZString::noDuplication);
  ObjectValues::const_iterator it = value_.map_->find(actualKey);
  if (it == value_.map_->end())
    return null;
  return (*it).second;
#else
  const Value* value = value_.map_->find(key);
  return value ? *value : null;
#endif
}

Value& Value::operator[](const std::string& key) {
  return (*this)[key.c_str()];
}

const Value& Value::operator[](const std::string& key) const {
  return (*this)[key.c_str()];
}

Value& Value::operator[](const StaticString& key) {
  return resolveReference(key, true);
}

#ifdef JSON_USE_CPPTL
Value& Value::operator[](const CppTL::ConstString& key) {
  return (*this)[key.c_str()];
}

const Value& Value::operator[](const CppTL::ConstString& key) const {
  return (*this)[key.c_str()];
}
#endif

Value& Value::append(const Value& value) { return (*this)[size()] = value; }

Value Value::get(const char* key, const Value& defaultValue) const {
  const Value* value = &((*this)[key]);
  return value == &null ? defaultValue : *value;
}

Value Value::get(const std::string& key, const Value& defaultValue) const {
  return get(key.c_str(), defaultValue);
}

Value Value::removeMember(const char* key) {
  JSON_ASSERT_MESSAGE(type_ == nullValue || type_ == objectValue,
                      "in Json::Value::removeMember(): requires objectValue");
  if (type_ == nullValue)
    return null;
#ifndef JSON_VALUE_USE_INTERNAL_MAP
  CZString actualKey(key, CZString::noDuplication);
  ObjectValues::iterator it = value_.map_->find(actualKey);
  if (it == value_.map_->end())
    return null;
  Value old(it->second);
  value_.map_->erase(it);
  return old;
#else
  Value* value = value_.map_->find(key);
  if (value) {
    Value old(*value);
    value_.map_.remove(key);
    return old;
  } else {
    return null;
  }
#endif
}

Value Value::removeMember(const std::string& key) {
  return removeMember(key.c_str());
}

#ifdef JSON_USE_CPPTL
Value Value::get(const CppTL::ConstString& key,
                 const Value& defaultValue) const {
  return get(key.c_str(), defaultValue);
}
#endif

bool Value::isMember(const char* key) const {
  const Value* value = &((*this)[key]);
  return value != &null;
}

bool Value::isMember(const std::string& key) const {
  return isMember(key.c_str());
}

#ifdef JSON_USE_CPPTL
bool Value::isMember(const CppTL::ConstString& key) const {
  return isMember(key.c_str());
}
#endif

Value::Members Value::getMemberNames() const {
  JSON_ASSERT_MESSAGE(
      type_ == nullValue || type_ == objectValue,
      "in Json::Value::getMemberNames(), value must be objectValue");
  if (type_ == nullValue)
    return Value::Members();
  Members members;
  members.reserve(value_.map_->size());
#ifndef JSON_VALUE_USE_INTERNAL_MAP
  ObjectValues::const_iterator it = value_.map_->begin();
  ObjectValues::const_iterator itEnd = value_.map_->end();
  for (; it != itEnd; ++it)
    members.push_back(std::string((*it).first.c_str()));
#else
  ValueInternalMap::IteratorState it;
  ValueInternalMap::IteratorState itEnd;
  value_.map_->makeBeginIterator(it);
  value_.map_->makeEndIterator(itEnd);
  for (; !ValueInternalMap::equals(it, itEnd); ValueInternalMap::increment(it))
    members.push_back(std::string(ValueInternalMap::key(it)));
#endif
  return members;
}
//
//# ifdef JSON_USE_CPPTL
// EnumMemberNames
// Value::enumMemberNames() const
//{
//   if ( type_ == objectValue )
//   {
//      return CppTL::Enum::any(  CppTL::Enum::transform(
//         CppTL::Enum::keys( *(value_.map_), CppTL::Type<const CZString &>() ),
//         MemberNamesTransform() ) );
//   }
//   return EnumMemberNames();
//}
//
//
// EnumValues
// Value::enumValues() const
//{
//   if ( type_ == objectValue  ||  type_ == arrayValue )
//      return CppTL::Enum::anyValues( *(value_.map_),
//                                     CppTL::Type<const Value &>() );
//   return EnumValues();
//}
//
//# endif

static bool IsIntegral(double d) {
  double integral_part;
  return modf(d, &integral_part) == 0.0;
}

bool Value::isNull() const { return type_ == nullValue; }

bool Value::isBool() const { return type_ == booleanValue; }

bool Value::isInt() const {
  switch (type_) {
  case intValue:
    return value_.int_ >= minInt && value_.int_ <= maxInt;
  case uintValue:
    return value_.uint_ <= UInt(maxInt);
  case realValue:
    return value_.real_ >= minInt && value_.real_ <= maxInt &&
           IsIntegral(value_.real_);
  default:
    break;
  }
  return false;
}

bool Value::isUInt() const {
  switch (type_) {
  case intValue:
    return value_.int_ >= 0 && LargestUInt(value_.int_) <= LargestUInt(maxUInt);
  case uintValue:
    return value_.uint_ <= maxUInt;
  case realValue:
    return value_.real_ >= 0 && value_.real_ <= maxUInt &&
           IsIntegral(value_.real_);
  default:
    break;
  }
  return false;
}

bool Value::isInt64() const {
#if defined(JSON_HAS_INT64)
  switch (type_) {
  case intValue:
    return true;
  case uintValue:
    return value_.uint_ <= UInt64(maxInt64);
  case realValue:
    // Note that maxInt64 (= 2^63 - 1) is not exactly representable as a
    // double, so double(maxInt64) will be rounded up to 2^63. Therefore we
    // require the value to be strictly less than the limit.
    return value_.real_ >= double(minInt64) &&
           value_.real_ < double(maxInt64) && IsIntegral(value_.real_);
  default:
    break;
  }
#endif // JSON_HAS_INT64
  return false;
}

bool Value::isUInt64() const {
#if defined(JSON_HAS_INT64)
  switch (type_) {
  case intValue:
    return value_.int_ >= 0;
  case uintValue:
    return true;
  case realValue:
    // Note that maxUInt64 (= 2^64 - 1) is not exactly representable as a
    // double, so double(maxUInt64) will be rounded up to 2^64. Therefore we
    // require the value to be strictly less than the limit.
    return value_.real_ >= 0 && value_.real_ < maxUInt64AsDouble &&
           IsIntegral(value_.real_);
  default:
    break;
  }
#endif // JSON_HAS_INT64
  return false;
}

bool Value::isIntegral() const {
#if defined(JSON_HAS_INT64)
  return isInt64() || isUInt64();
#else
  return isInt() || isUInt();
#endif
}

bool Value::isDouble() const { return type_ == realValue || isIntegral(); }

bool Value::isNumeric() const { return isIntegral() || isDouble(); }

bool Value::isString() const { return type_ == stringValue; }

bool Value::isArray() const { return type_ == arrayValue; }

bool Value::isObject() const { return type_ == objectValue; }

void Value::setComment(const char* comment, CommentPlacement placement) {
  if (!comments_)
    comments_ = new CommentInfo[numberOfCommentPlacement];
  comments_[placement].setComment(comment);
}

void Value::setComment(const std::string& comment, CommentPlacement placement) {
  setComment(comment.c_str(), placement);
}

bool Value::hasComment(CommentPlacement placement) const {
  return comments_ != 0 && comments_[placement].comment_ != 0;
}

std::string Value::getComment(CommentPlacement placement) const {
  if (hasComment(placement))
    return comments_[placement].comment_;
  return "";
}

void Value::setOffsetStart(size_t start) { start_ = start; }

void Value::setOffsetLimit(size_t limit) { limit_ = limit; }

size_t Value::getOffsetStart() const { return start_; }

size_t Value::getOffsetLimit() const { return limit_; }

std::string Value::toStyledString() const {
  StyledWriter writer;
  return writer.write(*this);
}

Value::const_iterator Value::begin() const {
  switch (type_) {
#ifdef JSON_VALUE_USE_INTERNAL_MAP
  case arrayValue:
    if (value_.array_) {
      ValueInternalArray::IteratorState it;
      value_.array_->makeBeginIterator(it);
      return const_iterator(it);
    }
    break;
  case objectValue:
    if (value_.map_) {
      ValueInternalMap::IteratorState it;
      value_.map_->makeBeginIterator(it);
      return const_iterator(it);
    }
    break;
#else
  case arrayValue:
  case objectValue:
    if (value_.map_)
      return const_iterator(value_.map_->begin());
    break;
#endif
  default:
    break;
  }
  return const_iterator();
}

Value::const_iterator Value::end() const {
  switch (type_) {
#ifdef JSON_VALUE_USE_INTERNAL_MAP
  case arrayValue:
    if (value_.array_) {
      ValueInternalArray::IteratorState it;
      value_.array_->makeEndIterator(it);
      return const_iterator(it);
    }
    break;
  case objectValue:
    if (value_.map_) {
      ValueInternalMap::IteratorState it;
      value_.map_->makeEndIterator(it);
      return const_iterator(it);
    }
    break;
#else
  case arrayValue:
  case objectValue:
    if (value_.map_)
      return const_iterator(value_.map_->end());
    break;
#endif
  default:
    break;
  }
  return const_iterator();
}

Value::iterator Value::begin() {
  switch (type_) {
#ifdef JSON_VALUE_USE_INTERNAL_MAP
  case arrayValue:
    if (value_.array_) {
      ValueInternalArray::IteratorState it;
      value_.array_->makeBeginIterator(it);
      return iterator(it);
    }
    break;
  case objectValue:
    if (value_.map_) {
      ValueInternalMap::IteratorState it;
      value_.map_->makeBeginIterator(it);
      return iterator(it);
    }
    break;
#else
  case arrayValue:
  case objectValue:
    if (value_.map_)
      return iterator(value_.map_->begin());
    break;
#endif
  default:
    break;
  }
  return iterator();
}

Value::iterator Value::end() {
  switch (type_) {
#ifdef JSON_VALUE_USE_INTERNAL_MAP
  case arrayValue:
    if (value_.array_) {
      ValueInternalArray::IteratorState it;
      value_.array_->makeEndIterator(it);
      return iterator(it);
    }
    break;
  case objectValue:
    if (value_.map_) {
      ValueInternalMap::IteratorState it;
      value_.map_->makeEndIterator(it);
      return iterator(it);
    }
    break;
#else
  case arrayValue:
  case objectValue:
    if (value_.map_)
      return iterator(value_.map_->end());
    break;
#endif
  default:
    break;
  }
  return iterator();
}

// class PathArgument
// //////////////////////////////////////////////////////////////////

PathArgument::PathArgument() : key_(), index_(), kind_(kindNone) {}

PathArgument::PathArgument(ArrayIndex index)
    : key_(), index_(index), kind_(kindIndex) {}

PathArgument::PathArgument(const char* key)
    : key_(key), index_(), kind_(kindKey) {}

PathArgument::PathArgument(const std::string& key)
    : key_(key.c_str()), index_(), kind_(kindKey) {}

// class Path
// //////////////////////////////////////////////////////////////////

Path::Path(const std::string& path,
           const PathArgument& a1,
           const PathArgument& a2,
           const PathArgument& a3,
           const PathArgument& a4,
           const PathArgument& a5) {
  InArgs in;
  in.push_back(&a1);
  in.push_back(&a2);
  in.push_back(&a3);
  in.push_back(&a4);
  in.push_back(&a5);
  makePath(path, in);
}

void Path::makePath(const std::string& path, const InArgs& in) {
  const char* current = path.c_str();
  const char* end = current + path.length();
  InArgs::const_iterator itInArg = in.begin();
  while (current != end) {
    if (*current == '[') {
      ++current;
      if (*current == '%')
        addPathInArg(path, in, itInArg, PathArgument::kindIndex);
      else {
        ArrayIndex index = 0;
        for (; current != end && *current >= '0' && *current <= '9'; ++current)
          index = index * 10 + ArrayIndex(*current - '0');
        args_.push_back(index);
      }
      if (current == end || *current++ != ']')
        invalidPath(path, int(current - path.c_str()));
    } else if (*current == '%') {
      addPathInArg(path, in, itInArg, PathArgument::kindKey);
      ++current;
    } else if (*current == '.') {
      ++current;
    } else {
      const char* beginName = current;
      while (current != end && !strchr("[.", *current))
        ++current;
      args_.push_back(std::string(beginName, current));
    }
  }
}

void Path::addPathInArg(const std::string& /*path*/,
                        const InArgs& in,
                        InArgs::const_iterator& itInArg,
                        PathArgument::Kind kind) {
  if (itInArg == in.end()) {
    // Error: missing argument %d
  } else if ((*itInArg)->kind_ != kind) {
    // Error: bad argument type
  } else {
    args_.push_back(**itInArg);
  }
}

void Path::invalidPath(const std::string& /*path*/, int /*location*/) {
  // Error: invalid path.
}

const Value& Path::resolve(const Value& root) const {
  const Value* node = &root;
  for (Args::const_iterator it = args_.begin(); it != args_.end(); ++it) {
    const PathArgument& arg = *it;
    if (arg.kind_ == PathArgument::kindIndex) {
      if (!node->isArray() || !node->isValidIndex(arg.index_)) {
        // Error: unable to resolve path (array value expected at position...
      }
      node = &((*node)[arg.index_]);
    } else if (arg.kind_ == PathArgument::kindKey) {
      if (!node->isObject()) {
        // Error: unable to resolve path (object value expected at position...)
      }
      node = &((*node)[arg.key_]);
      if (node == &Value::null) {
        // Error: unable to resolve path (object has no member named '' at
        // position...)
      }
    }
  }
  return *node;
}

Value Path::resolve(const Value& root, const Value& defaultValue) const {
  const Value* node = &root;
  for (Args::const_iterator it = args_.begin(); it != args_.end(); ++it) {
    const PathArgument& arg = *it;
    if (arg.kind_ == PathArgument::kindIndex) {
      if (!node->isArray() || !node->isValidIndex(arg.index_))
        return defaultValue;
      node = &((*node)[arg.index_]);
    } else if (arg.kind_ == PathArgument::kindKey) {
      if (!node->isObject())
        return defaultValue;
      node = &((*node)[arg.key_]);
      if (node == &Value::null)
        return defaultValue;
    }
  }
  return *node;
}

Value& Path::make(Value& root) const {
  Value* node = &root;
  for (Args::const_iterator it = args_.begin(); it != args_.end(); ++it) {
    const PathArgument& arg = *it;
    if (arg.kind_ == PathArgument::kindIndex) {
      if (!node->isArray()) {
        // Error: node is not an array at position ...
      }
      node = &((*node)[arg.index_]);
    } else if (arg.kind_ == PathArgument::kindKey) {
      if (!node->isObject()) {
        // Error: node is not an object at position...
      }
      node = &((*node)[arg.key_]);
    }
  }
  return *node;
}

} // namespace Json