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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 
8 namespace Json {
9 
10 // //////////////////////////////////////////////////////////////////
11 // //////////////////////////////////////////////////////////////////
12 // //////////////////////////////////////////////////////////////////
13 // class ValueIteratorBase
14 // //////////////////////////////////////////////////////////////////
15 // //////////////////////////////////////////////////////////////////
16 // //////////////////////////////////////////////////////////////////
17 
19 
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 
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 
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 
78  const Value::CZString czstring = (*current_).first;
79  if (!czstring.data())
80  return czstring.index();
81  return Value::UInt(-1);
82 }
83 
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 
98 char 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 
117 
119  const Value::ObjectValues::iterator& current)
120  : ValueIteratorBase(current) {}
121 
123  : ValueIteratorBase(other) {}
124 
126 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 
145  : ValueIteratorBase(other) {
146  throwRuntimeError("ConstIterator to Iterator should never be allowed.");
147 }
148 
149 ValueIterator::ValueIterator(const ValueIterator& other) = default;
150 
152  copy(other);
153  return *this;
154 }
155 
156 } // namespace Json
Json::ValueConstIterator::operator=
SelfType & operator=(const ValueIteratorBase &other)
Definition: json_valueiterator.inl:126
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::Value::UInt
Json::UInt UInt
Definition: value.h:200
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::ValueConstIterator
const iterator for object and array value.
Definition: value.h:820
Json::ValueIterator
Iterator for object and array value.
Definition: value.h:871
Json::ValueIteratorBase::computeDistance
difference_type computeDistance(const SelfType &other) const
Definition: json_valueiterator.inl:32
Json::ValueIteratorBase::deref
const Value & deref() const
Definition: json_valueiterator.inl:25
Json::ValueIteratorBase::copy
void copy(const SelfType &other)
Definition: json_valueiterator.inl:62
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::ValueConstIterator::ValueConstIterator
ValueConstIterator()
Json::UInt
unsigned int UInt
Definition: config.h:109
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::Value
Represents a JSON value.
Definition: value.h:193
Json::ValueIterator::operator=
SelfType & operator=(const SelfType &other)
Definition: json_valueiterator.inl:151
Json::ValueIterator::ValueIterator
ValueIterator()
Json
JSON (JavaScript Object Notation).
Definition: allocator.h:14
Json::ValueIteratorBase
base class for Value iterators.
Definition: value.h:746
Json::ValueIteratorBase::difference_type
int difference_type
Definition: value.h:750
Json::ValueIteratorBase::ValueIteratorBase
ValueIteratorBase()
Definition: json_valueiterator.inl:18
Json::String
std::basic_string< char, std::char_traits< char >, Allocator< char > > String
Definition: config.h:132
Json::ValueIteratorBase::isEqual
bool isEqual(const SelfType &other) const
Definition: json_valueiterator.inl:55
Json::ValueIteratorBase::increment
void increment()
Definition: json_valueiterator.inl:27
Json::StaticString
Lightweight wrapper to tag static string.
Definition: value.h:147
Json::ValueIteratorBase::decrement
void decrement()
Definition: json_valueiterator.inl:29