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json_valueiterator.inl
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1// Copyright 2007-2010 Baptiste Lepilleur and The JsonCpp Authors
2// Distributed under MIT license, or public domain if desired and
3// recognized in your jurisdiction.
4// See file LICENSE for detail or copy at http://jsoncpp.sourceforge.net/LICENSE
5
6// included by json_value.cpp
7
8namespace Json {
9
10// //////////////////////////////////////////////////////////////////
11// //////////////////////////////////////////////////////////////////
12// //////////////////////////////////////////////////////////////////
13// class ValueIteratorBase
14// //////////////////////////////////////////////////////////////////
15// //////////////////////////////////////////////////////////////////
16// //////////////////////////////////////////////////////////////////
17
18ValueIteratorBase::ValueIteratorBase() : current_() {}
19
20 ValueIteratorBase::ValueIteratorBase(
21 const Value::ObjectValues::iterator& current)
22 : current_(current), isNull_(false) {}
23
24 Value& ValueIteratorBase::deref() { return current_->second; }
25 const Value& ValueIteratorBase::deref() const { return current_->second; }
26
27 void ValueIteratorBase::increment() { ++current_; }
28
29 void ValueIteratorBase::decrement() { --current_; }
30
31 ValueIteratorBase::difference_type
32ValueIteratorBase::computeDistance(const SelfType& other) const {
33 // Iterator for null value are initialized using the default
34 // constructor, which initialize current_ to the default
35 // std::map::iterator. As begin() and end() are two instance
36 // of the default std::map::iterator, they can not be compared.
37 // To allow this, we handle this comparison specifically.
38 if (isNull_ && other.isNull_) {
39 return 0;
40 }
41
42 // Usage of std::distance is not portable (does not compile with Sun Studio 12
43 // RogueWave STL,
44 // which is the one used by default).
45 // Using a portable hand-made version for non random iterator instead:
46 // return difference_type( std::distance( current_, other.current_ ) );
47 difference_type myDistance = 0;
48 for (Value::ObjectValues::iterator it = current_; it != other.current_;
49 ++it) {
50 ++myDistance;
51 }
52 return myDistance;
53}
54
55 bool ValueIteratorBase::isEqual(const SelfType& other) const {
56 if (isNull_) {
57 return other.isNull_;
58 }
59 return current_ == other.current_;
60}
61
62 void ValueIteratorBase::copy(const SelfType& other) {
63 current_ = other.current_;
64 isNull_ = other.isNull_;
65}
66
67 Value ValueIteratorBase::key() const {
68 const Value::CZString czstring = (*current_).first;
69 if (czstring.data()) {
70 if (czstring.isStaticString())
71 return Value(StaticString(czstring.data()));
72 return Value(czstring.data(), czstring.data() + czstring.length());
73 }
74 return Value(czstring.index());
75}
76
77 UInt ValueIteratorBase::index() const {
78 const Value::CZString czstring = (*current_).first;
79 if (!czstring.data())
80 return czstring.index();
81 return Value::UInt(-1);
82}
83
84 String ValueIteratorBase::name() const {
85 char const* keey;
86 char const* end;
87 keey = memberName(&end);
88 if (!keey)
89 return String();
90 return String(keey, end);
91}
92
93 char const* ValueIteratorBase::memberName() const {
94 const char* cname = (*current_).first.data();
95 return cname ? cname : "";
96}
97
98char const* ValueIteratorBase::memberName(char const** end) const {
99 const char* cname = (*current_).first.data();
100 if (!cname) {
101 *end = nullptr;
102 return nullptr;
103 }
104 *end = cname + (*current_).first.length();
105 return cname;
106}
107
108// //////////////////////////////////////////////////////////////////
109// //////////////////////////////////////////////////////////////////
110// //////////////////////////////////////////////////////////////////
111// class ValueConstIterator
112// //////////////////////////////////////////////////////////////////
113// //////////////////////////////////////////////////////////////////
114// //////////////////////////////////////////////////////////////////
115
116 ValueConstIterator::ValueConstIterator() = default;
117
118 ValueConstIterator::ValueConstIterator(
119 const Value::ObjectValues::iterator& current)
120 : ValueIteratorBase(current) {}
121
122 ValueConstIterator::ValueConstIterator(ValueIterator const& other)
123 : ValueIteratorBase(other) {}
124
125 ValueConstIterator&
126ValueConstIterator::operator=(const ValueIteratorBase& other) {
127 copy(other);
128 return *this;
129}
130
131// //////////////////////////////////////////////////////////////////
132// //////////////////////////////////////////////////////////////////
133// //////////////////////////////////////////////////////////////////
134// class ValueIterator
135// //////////////////////////////////////////////////////////////////
136// //////////////////////////////////////////////////////////////////
137// //////////////////////////////////////////////////////////////////
138
139 ValueIterator::ValueIterator() = default;
140
141 ValueIterator::ValueIterator(const Value::ObjectValues::iterator& current)
142 : ValueIteratorBase(current) {}
143
144 ValueIterator::ValueIterator(const ValueConstIterator& other)
145 : ValueIteratorBase(other) {
146 throwRuntimeError("ConstIterator to Iterator should never be allowed.");
147}
148
149 ValueIterator::ValueIterator(const ValueIterator& other) = default;
150
151 ValueIterator& ValueIterator::operator=(const SelfType& other) {
152 copy(other);
153 return *this;
154}
155
156} // namespace Json
Json::StaticString::StaticString
StaticString(const char *czstring)
Definition value.h:163
Json::ValueConstIterator
const iterator for object and array value.
Definition value.h:943
Json::ValueConstIterator::ValueConstIterator
ValueConstIterator()
Json::ValueConstIterator::operator=
SelfType & operator=(const ValueIteratorBase &other)
Definition json_valueiterator.inl:126
Json::Value
Represents a JSON value.
Definition value.h:207
Json::Value::UInt
Json::UInt UInt
Definition value.h:215
Json::Value::Value
Value(ValueType type=nullValue)
Create a default Value of the given type.
Definition json_value.cpp:392
Json::ValueIteratorBase
base class for Value iterators.
Definition value.h:869
Json::ValueIteratorBase::isEqual
bool isEqual(const SelfType &other) const
Definition json_valueiterator.inl:55
Json::ValueIteratorBase::key
Value key() const
Return either the index or the member name of the referenced value as a Value.
Definition json_valueiterator.inl:67
Json::ValueIteratorBase::memberName
char const * memberName(char const **end) const
Return the member name of the referenced Value, or NULL if it is not an objectValue.
Definition json_valueiterator.inl:93
Json::ValueIteratorBase::copy
void copy(const SelfType &other)
Definition json_valueiterator.inl:62
Json::ValueIteratorBase::index
UInt index() const
Return the index of the referenced Value, or -1 if it is not an arrayValue.
Definition json_valueiterator.inl:77
Json::ValueIteratorBase::name
String name() const
Return the member name of the referenced Value, or "" if it is not an objectValue.
Definition json_valueiterator.inl:84
Json::ValueIteratorBase::deref
const Value & deref() const
Definition json_valueiterator.inl:25
Json::ValueIteratorBase::SelfType
ValueIteratorBase SelfType
Definition value.h:874
Json::ValueIteratorBase::computeDistance
difference_type computeDistance(const SelfType &other) const
Definition json_valueiterator.inl:32
Json::ValueIteratorBase::ValueIteratorBase
ValueIteratorBase()
Definition json_valueiterator.inl:18
Json::ValueIteratorBase::increment
void increment()
Definition json_valueiterator.inl:27
Json::ValueIteratorBase::difference_type
int difference_type
Definition value.h:873
Json::ValueIteratorBase::decrement
void decrement()
Definition json_valueiterator.inl:29
Json::ValueIterator
Iterator for object and array value.
Definition value.h:994
Json::ValueIterator::ValueIterator
ValueIterator()
Json::ValueIterator::SelfType
ValueIterator SelfType
Definition value.h:1003
Json::ValueIterator::operator=
SelfType & operator=(const SelfType &other)
Definition json_valueiterator.inl:151
Json
JSON (JavaScript Object Notation).
Definition allocator.h:16
Json::UInt
unsigned int UInt
Definition config.h:110
Json::String
std::basic_string< char, std::char_traits< char >, Allocator< char > > String
Definition config.h:135