diff options
Diffstat (limited to 'toolkit/components/jsoncpp/include/json/value.h')
| -rw-r--r-- | toolkit/components/jsoncpp/include/json/value.h | 935 |
1 files changed, 935 insertions, 0 deletions
diff --git a/toolkit/components/jsoncpp/include/json/value.h b/toolkit/components/jsoncpp/include/json/value.h new file mode 100644 index 0000000000..0edeb050ca --- /dev/null +++ b/toolkit/components/jsoncpp/include/json/value.h @@ -0,0 +1,935 @@ +// Copyright 2007-2010 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 + +#ifndef JSON_H_INCLUDED +#define JSON_H_INCLUDED + +#if !defined(JSON_IS_AMALGAMATION) +#include "forwards.h" +#endif // if !defined(JSON_IS_AMALGAMATION) + +// Conditional NORETURN attribute on the throw functions would: +// a) suppress false positives from static code analysis +// b) possibly improve optimization opportunities. +#if !defined(JSONCPP_NORETURN) +#if defined(_MSC_VER) && _MSC_VER == 1800 +#define JSONCPP_NORETURN __declspec(noreturn) +#else +#define JSONCPP_NORETURN [[noreturn]] +#endif +#endif + +// Support for '= delete' with template declarations was a late addition +// to the c++11 standard and is rejected by clang 3.8 and Apple clang 8.2 +// even though these declare themselves to be c++11 compilers. +#if !defined(JSONCPP_TEMPLATE_DELETE) +#if defined(__clang__) && defined(__apple_build_version__) +#if __apple_build_version__ <= 8000042 +#define JSONCPP_TEMPLATE_DELETE +#endif +#elif defined(__clang__) +#if __clang_major__ == 3 && __clang_minor__ <= 8 +#define JSONCPP_TEMPLATE_DELETE +#endif +#endif +#if !defined(JSONCPP_TEMPLATE_DELETE) +#define JSONCPP_TEMPLATE_DELETE = delete +#endif +#endif + +#include <array> +#include <exception> +#include <map> +#include <memory> +#include <string> +#include <vector> + +// Disable warning C4251: <data member>: <type> needs to have dll-interface to +// be used by... +#if defined(JSONCPP_DISABLE_DLL_INTERFACE_WARNING) +#pragma warning(push) +#pragma warning(disable : 4251 4275) +#endif // if defined(JSONCPP_DISABLE_DLL_INTERFACE_WARNING) + +#pragma pack(push, 8) + +/** \brief JSON (JavaScript Object Notation). + */ +namespace Json { + +#if JSON_USE_EXCEPTION +/** Base class for all exceptions we throw. + * + * We use nothing but these internally. Of course, STL can throw others. + */ +class JSON_API Exception : public std::exception { +public: + Exception(String msg); + ~Exception() noexcept override; + char const* what() const noexcept override; + +protected: + String msg_; +}; + +/** Exceptions which the user cannot easily avoid. + * + * E.g. out-of-memory (when we use malloc), stack-overflow, malicious input + * + * \remark derived from Json::Exception + */ +class JSON_API RuntimeError : public Exception { +public: + RuntimeError(String const& msg); +}; + +/** Exceptions thrown by JSON_ASSERT/JSON_FAIL macros. + * + * These are precondition-violations (user bugs) and internal errors (our bugs). + * + * \remark derived from Json::Exception + */ +class JSON_API LogicError : public Exception { +public: + LogicError(String const& msg); +}; +#endif + +/// used internally +JSONCPP_NORETURN void throwRuntimeError(String const& msg); +/// used internally +JSONCPP_NORETURN void throwLogicError(String const& msg); + +/** \brief Type of the value held by a Value object. + */ +enum ValueType { + nullValue = 0, ///< 'null' value + intValue, ///< signed integer value + uintValue, ///< unsigned integer value + realValue, ///< double value + stringValue, ///< UTF-8 string value + booleanValue, ///< bool value + arrayValue, ///< array value (ordered list) + objectValue ///< object value (collection of name/value pairs). +}; + +enum CommentPlacement { + commentBefore = 0, ///< a comment placed on the line before a value + commentAfterOnSameLine, ///< a comment just after a value on the same line + commentAfter, ///< a comment on the line after a value (only make sense for + /// root value) + numberOfCommentPlacement +}; + +/** \brief Type of precision for formatting of real values. + */ +enum PrecisionType { + significantDigits = 0, ///< we set max number of significant digits in string + decimalPlaces ///< we set max number of digits after "." in string +}; + +/** \brief Lightweight wrapper to tag static string. + * + * Value constructor and objectValue member assignment takes advantage of the + * StaticString and avoid the cost of string duplication when storing the + * string or the member name. + * + * Example of usage: + * \code + * Json::Value aValue( StaticString("some text") ); + * Json::Value object; + * static const StaticString code("code"); + * object[code] = 1234; + * \endcode + */ +class JSON_API StaticString { +public: + explicit StaticString(const char* czstring) : c_str_(czstring) {} + + operator const char*() const { return c_str_; } + + const char* c_str() const { return c_str_; } + +private: + const char* c_str_; +}; + +/** \brief Represents a <a HREF="http://www.json.org">JSON</a> value. + * + * This class is a discriminated union wrapper that can represents a: + * - signed integer [range: Value::minInt - Value::maxInt] + * - unsigned integer (range: 0 - Value::maxUInt) + * - double + * - UTF-8 string + * - boolean + * - 'null' + * - an ordered list of Value + * - collection of name/value pairs (javascript object) + * + * The type of the held value is represented by a #ValueType and + * can be obtained using type(). + * + * Values of an #objectValue or #arrayValue can be accessed using operator[]() + * methods. + * Non-const methods will automatically create the a #nullValue element + * if it does not exist. + * The sequence of an #arrayValue will be automatically resized and initialized + * with #nullValue. resize() can be used to enlarge or truncate an #arrayValue. + * + * The get() methods can be used to obtain default value in the case the + * required element does not exist. + * + * It is possible to iterate over the list of member keys of an object using + * the getMemberNames() method. + * + * \note #Value string-length fit in size_t, but keys must be < 2^30. + * (The reason is an implementation detail.) A #CharReader will raise an + * exception if a bound is exceeded to avoid security holes in your app, + * but the Value API does *not* check bounds. That is the responsibility + * of the caller. + */ +class JSON_API Value { + friend class ValueIteratorBase; + +public: + using Members = std::vector<String>; + using iterator = ValueIterator; + using const_iterator = ValueConstIterator; + using UInt = Json::UInt; + using Int = Json::Int; +#if defined(JSON_HAS_INT64) + using UInt64 = Json::UInt64; + using Int64 = Json::Int64; +#endif // defined(JSON_HAS_INT64) + using LargestInt = Json::LargestInt; + using LargestUInt = Json::LargestUInt; + using ArrayIndex = Json::ArrayIndex; + + // Required for boost integration, e. g. BOOST_TEST + using value_type = std::string; + +#if JSON_USE_NULLREF + // Binary compatibility kludges, do not use. + static const Value& null; + static const Value& nullRef; +#endif + + // null and nullRef are deprecated, use this instead. + static Value const& nullSingleton(); + + /// Minimum signed integer value that can be stored in a Json::Value. + static constexpr LargestInt minLargestInt = + LargestInt(~(LargestUInt(-1) / 2)); + /// Maximum signed integer value that can be stored in a Json::Value. + static constexpr LargestInt maxLargestInt = LargestInt(LargestUInt(-1) / 2); + /// Maximum unsigned integer value that can be stored in a Json::Value. + static constexpr LargestUInt maxLargestUInt = LargestUInt(-1); + + /// Minimum signed int value that can be stored in a Json::Value. + static constexpr Int minInt = Int(~(UInt(-1) / 2)); + /// Maximum signed int value that can be stored in a Json::Value. + static constexpr Int maxInt = Int(UInt(-1) / 2); + /// Maximum unsigned int value that can be stored in a Json::Value. + static constexpr UInt maxUInt = UInt(-1); + +#if defined(JSON_HAS_INT64) + /// Minimum signed 64 bits int value that can be stored in a Json::Value. + static constexpr Int64 minInt64 = Int64(~(UInt64(-1) / 2)); + /// Maximum signed 64 bits int value that can be stored in a Json::Value. + static constexpr Int64 maxInt64 = Int64(UInt64(-1) / 2); + /// Maximum unsigned 64 bits int value that can be stored in a Json::Value. + static constexpr UInt64 maxUInt64 = UInt64(-1); +#endif // defined(JSON_HAS_INT64) + /// Default precision for real value for string representation. + static constexpr UInt defaultRealPrecision = 17; + // 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 constexpr double maxUInt64AsDouble = 18446744073709551615.0; +// Workaround for bug in the NVIDIAs CUDA 9.1 nvcc compiler +// when using gcc and clang backend compilers. CZString +// cannot be defined as private. See issue #486 +#ifdef __NVCC__ +public: +#else +private: +#endif +#ifndef JSONCPP_DOC_EXCLUDE_IMPLEMENTATION + class CZString { + public: + enum DuplicationPolicy { noDuplication = 0, duplicate, duplicateOnCopy }; + CZString(ArrayIndex index); + CZString(char const* str, unsigned length, DuplicationPolicy allocate); + CZString(CZString const& other); + CZString(CZString&& other) noexcept; + ~CZString(); + CZString& operator=(const CZString& other); + CZString& operator=(CZString&& other) noexcept; + + bool operator<(CZString const& other) const; + bool operator==(CZString const& other) const; + ArrayIndex index() const; + // const char* c_str() const; ///< \deprecated + char const* data() const; + unsigned length() const; + bool isStaticString() const; + + private: + void swap(CZString& other); + + struct StringStorage { + unsigned policy_ : 2; + unsigned length_ : 30; // 1GB max + }; + + char const* cstr_; // actually, a prefixed string, unless policy is noDup + union { + ArrayIndex index_; + StringStorage storage_; + }; + }; + +public: + typedef std::map<CZString, Value> ObjectValues; +#endif // ifndef JSONCPP_DOC_EXCLUDE_IMPLEMENTATION + +public: + /** + * \brief Create a default Value of the given type. + * + * This is a very useful constructor. + * To create an empty array, pass arrayValue. + * To create an empty object, pass objectValue. + * Another Value can then be set to this one by assignment. + * This is useful since clear() and resize() will not alter types. + * + * Examples: + * \code + * Json::Value null_value; // null + * Json::Value arr_value(Json::arrayValue); // [] + * Json::Value obj_value(Json::objectValue); // {} + * \endcode + */ + Value(ValueType type = nullValue); + Value(Int value); + Value(UInt value); +#if defined(JSON_HAS_INT64) + Value(Int64 value); + Value(UInt64 value); +#endif // if defined(JSON_HAS_INT64) + Value(double value); + Value(const char* value); ///< Copy til first 0. (NULL causes to seg-fault.) + Value(const char* begin, const char* end); ///< Copy all, incl zeroes. + /** + * \brief Constructs a value from a static string. + * + * Like other value string constructor but do not duplicate the string for + * internal storage. The given string must remain alive after the call to + * this constructor. + * + * \note This works only for null-terminated strings. (We cannot change the + * size of this class, so we have nowhere to store the length, which might be + * computed later for various operations.) + * + * Example of usage: + * \code + * static StaticString foo("some text"); + * Json::Value aValue(foo); + * \endcode + */ + Value(const StaticString& value); + Value(const String& value); + Value(bool value); + Value(std::nullptr_t ptr) = delete; + Value(const Value& other); + Value(Value&& other) noexcept; + ~Value(); + + /// \note Overwrite existing comments. To preserve comments, use + /// #swapPayload(). + Value& operator=(const Value& other); + Value& operator=(Value&& other) noexcept; + + /// Swap everything. + void swap(Value& other); + /// Swap values but leave comments and source offsets in place. + void swapPayload(Value& other); + + /// copy everything. + void copy(const Value& other); + /// copy values but leave comments and source offsets in place. + void copyPayload(const Value& other); + + ValueType type() const; + + /// Compare payload only, not comments etc. + bool operator<(const Value& other) const; + bool operator<=(const Value& other) const; + bool operator>=(const Value& other) const; + bool operator>(const Value& other) const; + bool operator==(const Value& other) const; + bool operator!=(const Value& other) const; + int compare(const Value& other) const; + + const char* asCString() const; ///< Embedded zeroes could cause you trouble! +#if JSONCPP_USING_SECURE_MEMORY + unsigned getCStringLength() const; // Allows you to understand the length of + // the CString +#endif + String asString() const; ///< Embedded zeroes are possible. + /** Get raw char* of string-value. + * \return false if !string. (Seg-fault if str or end are NULL.) + */ + bool getString(char const** begin, char const** end) const; + Int asInt() const; + UInt asUInt() const; +#if defined(JSON_HAS_INT64) + Int64 asInt64() const; + UInt64 asUInt64() const; +#endif // if defined(JSON_HAS_INT64) + LargestInt asLargestInt() const; + LargestUInt asLargestUInt() const; + float asFloat() const; + double asDouble() const; + bool asBool() const; + + bool isNull() const; + bool isBool() const; + bool isInt() const; + bool isInt64() const; + bool isUInt() const; + bool isUInt64() const; + bool isIntegral() const; + bool isDouble() const; + bool isNumeric() const; + bool isString() const; + bool isArray() const; + bool isObject() const; + + /// The `as<T>` and `is<T>` member function templates and specializations. + template <typename T> T as() const JSONCPP_TEMPLATE_DELETE; + template <typename T> bool is() const JSONCPP_TEMPLATE_DELETE; + + bool isConvertibleTo(ValueType other) const; + + /// Number of values in array or object + ArrayIndex size() const; + + /// \brief Return true if empty array, empty object, or null; + /// otherwise, false. + bool empty() const; + + /// Return !isNull() + explicit operator bool() const; + + /// Remove all object members and array elements. + /// \pre type() is arrayValue, objectValue, or nullValue + /// \post type() is unchanged + void clear(); + + /// Resize the array to newSize elements. + /// New elements are initialized to null. + /// May only be called on nullValue or arrayValue. + /// \pre type() is arrayValue or nullValue + /// \post type() is arrayValue + void resize(ArrayIndex newSize); + + //@{ + /// Access an array element (zero based index). If the array contains less + /// than index element, then null value are inserted in the array so that + /// its size is index+1. + /// (You may need to say 'value[0u]' to get your compiler to distinguish + /// this from the operator[] which takes a string.) + Value& operator[](ArrayIndex index); + Value& operator[](int index); + //@} + + //@{ + /// Access an array element (zero based index). + /// (You may need to say 'value[0u]' to get your compiler to distinguish + /// this from the operator[] which takes a string.) + const Value& operator[](ArrayIndex index) const; + const Value& operator[](int index) const; + //@} + + /// If the array contains at least index+1 elements, returns the element + /// value, otherwise returns defaultValue. + Value get(ArrayIndex index, const Value& defaultValue) const; + /// Return true if index < size(). + bool isValidIndex(ArrayIndex index) const; + /// \brief Append value to array at the end. + /// + /// Equivalent to jsonvalue[jsonvalue.size()] = value; + Value& append(const Value& value); + Value& append(Value&& value); + + /// \brief Insert value in array at specific index + bool insert(ArrayIndex index, const Value& newValue); + bool insert(ArrayIndex index, Value&& newValue); + + /// Access an object value by name, create a null member if it does not exist. + /// \note Because of our implementation, keys are limited to 2^30 -1 chars. + /// Exceeding that will cause an exception. + Value& operator[](const char* key); + /// Access an object value by name, returns null if there is no member with + /// that name. + const Value& operator[](const char* key) const; + /// Access an object value by name, create a null member if it does not exist. + /// \param key may contain embedded nulls. + Value& operator[](const String& key); + /// Access an object value by name, returns null if there is no member with + /// that name. + /// \param key may contain embedded nulls. + const Value& operator[](const String& key) const; + /** \brief Access an object value by name, create a null member if it does not + * exist. + * + * If the object has no entry for that name, then the member name used to + * store the new entry is not duplicated. + * Example of use: + * \code + * Json::Value object; + * static const StaticString code("code"); + * object[code] = 1234; + * \endcode + */ + Value& operator[](const StaticString& key); + /// Return the member named key if it exist, defaultValue otherwise. + /// \note deep copy + Value get(const char* key, const Value& defaultValue) const; + /// Return the member named key if it exist, defaultValue otherwise. + /// \note deep copy + /// \note key may contain embedded nulls. + Value get(const char* begin, const char* end, + const Value& defaultValue) const; + /// Return the member named key if it exist, defaultValue otherwise. + /// \note deep copy + /// \param key may contain embedded nulls. + Value get(const String& key, const Value& defaultValue) const; + /// Most general and efficient version of isMember()const, get()const, + /// and operator[]const + /// \note As stated elsewhere, behavior is undefined if (end-begin) >= 2^30 + Value const* find(char const* begin, char const* end) const; + /// Most general and efficient version of object-mutators. + /// \note As stated elsewhere, behavior is undefined if (end-begin) >= 2^30 + /// \return non-zero, but JSON_ASSERT if this is neither object nor nullValue. + Value* demand(char const* begin, char const* end); + /// \brief Remove and return the named member. + /// + /// Do nothing if it did not exist. + /// \pre type() is objectValue or nullValue + /// \post type() is unchanged + void removeMember(const char* key); + /// Same as removeMember(const char*) + /// \param key may contain embedded nulls. + void removeMember(const String& key); + /// Same as removeMember(const char* begin, const char* end, Value* removed), + /// but 'key' is null-terminated. + bool removeMember(const char* key, Value* removed); + /** \brief Remove the named map member. + * + * Update 'removed' iff removed. + * \param key may contain embedded nulls. + * \return true iff removed (no exceptions) + */ + bool removeMember(String const& key, Value* removed); + /// Same as removeMember(String const& key, Value* removed) + bool removeMember(const char* begin, const char* end, Value* removed); + /** \brief Remove the indexed array element. + * + * O(n) expensive operations. + * Update 'removed' iff removed. + * \return true if removed (no exceptions) + */ + bool removeIndex(ArrayIndex index, Value* removed); + + /// Return true if the object has a member named key. + /// \note 'key' must be null-terminated. + bool isMember(const char* key) const; + /// Return true if the object has a member named key. + /// \param key may contain embedded nulls. + bool isMember(const String& key) const; + /// Same as isMember(String const& key)const + bool isMember(const char* begin, const char* end) const; + + /// \brief Return a list of the member names. + /// + /// If null, return an empty list. + /// \pre type() is objectValue or nullValue + /// \post if type() was nullValue, it remains nullValue + Members getMemberNames() const; + + /// \deprecated Always pass len. + JSONCPP_DEPRECATED("Use setComment(String const&) instead.") + void setComment(const char* comment, CommentPlacement placement) { + setComment(String(comment, strlen(comment)), placement); + } + /// Comments must be //... or /* ... */ + void setComment(const char* comment, size_t len, CommentPlacement placement) { + setComment(String(comment, len), placement); + } + /// Comments must be //... or /* ... */ + void setComment(String comment, CommentPlacement placement); + bool hasComment(CommentPlacement placement) const; + /// Include delimiters and embedded newlines. + String getComment(CommentPlacement placement) const; + + String toStyledString() const; + + const_iterator begin() const; + const_iterator end() const; + + iterator begin(); + iterator end(); + + // Accessors for the [start, limit) range of bytes within the JSON text from + // which this value was parsed, if any. + void setOffsetStart(ptrdiff_t start); + void setOffsetLimit(ptrdiff_t limit); + ptrdiff_t getOffsetStart() const; + ptrdiff_t getOffsetLimit() const; + +private: + void setType(ValueType v) { + bits_.value_type_ = static_cast<unsigned char>(v); + } + bool isAllocated() const { return bits_.allocated_; } + void setIsAllocated(bool v) { bits_.allocated_ = v; } + + void initBasic(ValueType type, bool allocated = false); + void dupPayload(const Value& other); + void releasePayload(); + void dupMeta(const Value& other); + + Value& resolveReference(const char* key); + Value& resolveReference(const char* key, const char* end); + + // struct MemberNamesTransform + //{ + // typedef const char *result_type; + // const char *operator()( const CZString &name ) const + // { + // return name.c_str(); + // } + //}; + + union ValueHolder { + LargestInt int_; + LargestUInt uint_; + double real_; + bool bool_; + char* string_; // if allocated_, ptr to { unsigned, char[] }. + ObjectValues* map_; + } value_; + + struct { + // Really a ValueType, but types should agree for bitfield packing. + unsigned int value_type_ : 8; + // Unless allocated_, string_ must be null-terminated. + unsigned int allocated_ : 1; + } bits_; + + class Comments { + public: + Comments() = default; + Comments(const Comments& that); + Comments(Comments&& that) noexcept; + Comments& operator=(const Comments& that); + Comments& operator=(Comments&& that) noexcept; + bool has(CommentPlacement slot) const; + String get(CommentPlacement slot) const; + void set(CommentPlacement slot, String comment); + + private: + using Array = std::array<String, numberOfCommentPlacement>; + std::unique_ptr<Array> ptr_; + }; + Comments comments_; + + // [start, limit) byte offsets in the source JSON text from which this Value + // was extracted. + ptrdiff_t start_; + ptrdiff_t limit_; +}; + +template <> inline bool Value::as<bool>() const { return asBool(); } +template <> inline bool Value::is<bool>() const { return isBool(); } + +template <> inline Int Value::as<Int>() const { return asInt(); } +template <> inline bool Value::is<Int>() const { return isInt(); } + +template <> inline UInt Value::as<UInt>() const { return asUInt(); } +template <> inline bool Value::is<UInt>() const { return isUInt(); } + +#if defined(JSON_HAS_INT64) +template <> inline Int64 Value::as<Int64>() const { return asInt64(); } +template <> inline bool Value::is<Int64>() const { return isInt64(); } + +template <> inline UInt64 Value::as<UInt64>() const { return asUInt64(); } +template <> inline bool Value::is<UInt64>() const { return isUInt64(); } +#endif + +template <> inline double Value::as<double>() const { return asDouble(); } +template <> inline bool Value::is<double>() const { return isDouble(); } + +template <> inline String Value::as<String>() const { return asString(); } +template <> inline bool Value::is<String>() const { return isString(); } + +/// These `as` specializations are type conversions, and do not have a +/// corresponding `is`. +template <> inline float Value::as<float>() const { return asFloat(); } +template <> inline const char* Value::as<const char*>() const { + return asCString(); +} + +/** \brief Experimental and untested: represents an element of the "path" to + * access a node. + */ +class JSON_API PathArgument { +public: + friend class Path; + + PathArgument(); + PathArgument(ArrayIndex index); + PathArgument(const char* key); + PathArgument(String key); + +private: + enum Kind { kindNone = 0, kindIndex, kindKey }; + String key_; + ArrayIndex index_{}; + Kind kind_{kindNone}; +}; + +/** \brief Experimental and untested: represents a "path" to access a node. + * + * Syntax: + * - "." => root node + * - ".[n]" => elements at index 'n' of root node (an array value) + * - ".name" => member named 'name' of root node (an object value) + * - ".name1.name2.name3" + * - ".[0][1][2].name1[3]" + * - ".%" => member name is provided as parameter + * - ".[%]" => index is provided as parameter + */ +class JSON_API Path { +public: + Path(const String& path, const PathArgument& a1 = PathArgument(), + const PathArgument& a2 = PathArgument(), + const PathArgument& a3 = PathArgument(), + const PathArgument& a4 = PathArgument(), + const PathArgument& a5 = PathArgument()); + + const Value& resolve(const Value& root) const; + Value resolve(const Value& root, const Value& defaultValue) const; + /// Creates the "path" to access the specified node and returns a reference on + /// the node. + Value& make(Value& root) const; + +private: + using InArgs = std::vector<const PathArgument*>; + using Args = std::vector<PathArgument>; + + void makePath(const String& path, const InArgs& in); + void addPathInArg(const String& path, const InArgs& in, + InArgs::const_iterator& itInArg, PathArgument::Kind kind); + static void invalidPath(const String& path, int location); + + Args args_; +}; + +/** \brief base class for Value iterators. + * + */ +class JSON_API ValueIteratorBase { +public: + using iterator_category = std::bidirectional_iterator_tag; + using size_t = unsigned int; + using difference_type = int; + using SelfType = ValueIteratorBase; + + bool operator==(const SelfType& other) const { return isEqual(other); } + + bool operator!=(const SelfType& other) const { return !isEqual(other); } + + difference_type operator-(const SelfType& other) const { + return other.computeDistance(*this); + } + + /// Return either the index or the member name of the referenced value as a + /// Value. + Value key() const; + + /// Return the index of the referenced Value, or -1 if it is not an + /// arrayValue. + UInt index() const; + + /// Return the member name of the referenced Value, or "" if it is not an + /// objectValue. + /// \note Avoid `c_str()` on result, as embedded zeroes are possible. + String name() const; + + /// Return the member name of the referenced Value. "" if it is not an + /// objectValue. + /// \deprecated This cannot be used for UTF-8 strings, since there can be + /// embedded nulls. + JSONCPP_DEPRECATED("Use `key = name();` instead.") + char const* memberName() const; + /// Return the member name of the referenced Value, or NULL if it is not an + /// objectValue. + /// \note Better version than memberName(). Allows embedded nulls. + char const* memberName(char const** end) const; + +protected: + /*! Internal utility functions to assist with implementing + * other iterator functions. The const and non-const versions + * of the "deref" protected methods expose the protected + * current_ member variable in a way that can often be + * optimized away by the compiler. + */ + const Value& deref() const; + Value& deref(); + + void increment(); + + void decrement(); + + difference_type computeDistance(const SelfType& other) const; + + bool isEqual(const SelfType& other) const; + + void copy(const SelfType& other); + +private: + Value::ObjectValues::iterator current_; + // Indicates that iterator is for a null value. + bool isNull_{true}; + +public: + // For some reason, BORLAND needs these at the end, rather + // than earlier. No idea why. + ValueIteratorBase(); + explicit ValueIteratorBase(const Value::ObjectValues::iterator& current); +}; + +/** \brief const iterator for object and array value. + * + */ +class JSON_API ValueConstIterator : public ValueIteratorBase { + friend class Value; + +public: + using value_type = const Value; + // typedef unsigned int size_t; + // typedef int difference_type; + using reference = const Value&; + using pointer = const Value*; + using SelfType = ValueConstIterator; + + ValueConstIterator(); + ValueConstIterator(ValueIterator const& other); + +private: + /*! \internal Use by Value to create an iterator. + */ + explicit ValueConstIterator(const Value::ObjectValues::iterator& current); + +public: + SelfType& operator=(const ValueIteratorBase& other); + + SelfType operator++(int) { + SelfType temp(*this); + ++*this; + return temp; + } + + SelfType operator--(int) { + SelfType temp(*this); + --*this; + return temp; + } + + SelfType& operator--() { + decrement(); + return *this; + } + + SelfType& operator++() { + increment(); + return *this; + } + + reference operator*() const { return deref(); } + + pointer operator->() const { return &deref(); } +}; + +/** \brief Iterator for object and array value. + */ +class JSON_API ValueIterator : public ValueIteratorBase { + friend class Value; + +public: + using value_type = Value; + using size_t = unsigned int; + using difference_type = int; + using reference = Value&; + using pointer = Value*; + using SelfType = ValueIterator; + + ValueIterator(); + explicit ValueIterator(const ValueConstIterator& other); + ValueIterator(const ValueIterator& other); + +private: + /*! \internal Use by Value to create an iterator. + */ + explicit ValueIterator(const Value::ObjectValues::iterator& current); + +public: + SelfType& operator=(const SelfType& other); + + SelfType operator++(int) { + SelfType temp(*this); + ++*this; + return temp; + } + + SelfType operator--(int) { + SelfType temp(*this); + --*this; + return temp; + } + + SelfType& operator--() { + decrement(); + return *this; + } + + SelfType& operator++() { + increment(); + return *this; + } + + /*! The return value of non-const iterators can be + * changed, so the these functions are not const + * because the returned references/pointers can be used + * to change state of the base class. + */ + reference operator*() const { return const_cast<reference>(deref()); } + pointer operator->() const { return const_cast<pointer>(&deref()); } +}; + +inline void swap(Value& a, Value& b) { a.swap(b); } + +} // namespace Json + +#pragma pack(pop) + +#if defined(JSONCPP_DISABLE_DLL_INTERFACE_WARNING) +#pragma warning(pop) +#endif // if defined(JSONCPP_DISABLE_DLL_INTERFACE_WARNING) + +#endif // JSON_H_INCLUDED |