1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
|
#pragma once
#include "clickhouse_config.h"
#if USE_RAPIDJSON
# include <base/types.h>
# include <base/defines.h>
# include <rapidjson/document.h>
# include "ElementTypes.h"
namespace DB
{
/// This class can be used as an argument for the template class FunctionJSON.
/// It provides ability to parse JSONs using rapidjson library.
struct RapidJSONParser
{
class Array;
class Object;
/// References an element in a JSON document, representing a JSON null, boolean, string, number,
/// array or object.
class Element
{
public:
ALWAYS_INLINE Element() = default;
ALWAYS_INLINE Element(const rapidjson::Value & value_) : ptr(&value_) {} /// NOLINT
ALWAYS_INLINE ElementType type() const
{
switch (ptr->GetType())
{
case rapidjson::kNumberType: return ptr->IsDouble() ? ElementType::DOUBLE : (ptr->IsUint64() ? ElementType::UINT64 : ElementType::INT64);
case rapidjson::kStringType: return ElementType::STRING;
case rapidjson::kArrayType: return ElementType::ARRAY;
case rapidjson::kObjectType: return ElementType::OBJECT;
case rapidjson::kTrueType: return ElementType::BOOL;
case rapidjson::kFalseType: return ElementType::BOOL;
case rapidjson::kNullType: return ElementType::NULL_VALUE;
}
}
ALWAYS_INLINE bool isInt64() const { return ptr->IsInt64(); }
ALWAYS_INLINE bool isUInt64() const { return ptr->IsUint64(); }
ALWAYS_INLINE bool isDouble() const { return ptr->IsDouble(); }
ALWAYS_INLINE bool isString() const { return ptr->IsString(); }
ALWAYS_INLINE bool isArray() const { return ptr->IsArray(); }
ALWAYS_INLINE bool isObject() const { return ptr->IsObject(); }
ALWAYS_INLINE bool isBool() const { return ptr->IsBool(); }
ALWAYS_INLINE bool isNull() const { return ptr->IsNull(); }
ALWAYS_INLINE Int64 getInt64() const { return ptr->GetInt64(); }
ALWAYS_INLINE UInt64 getUInt64() const { return ptr->GetUint64(); }
ALWAYS_INLINE double getDouble() const { return ptr->GetDouble(); }
ALWAYS_INLINE bool getBool() const { return ptr->GetBool(); }
ALWAYS_INLINE std::string_view getString() const { return {ptr->GetString(), ptr->GetStringLength()}; }
Array getArray() const;
Object getObject() const;
private:
const rapidjson::Value * ptr = nullptr;
};
/// References an array in a JSON document.
class Array
{
public:
class Iterator
{
public:
ALWAYS_INLINE Iterator(const rapidjson::Value::ConstValueIterator & it_) : it(it_) {} /// NOLINT
ALWAYS_INLINE Element operator*() const { return *it; } /// NOLINT
ALWAYS_INLINE Iterator & operator ++() { ++it; return *this; }
ALWAYS_INLINE Iterator operator ++(int) { auto res = *this; ++it; return res; } /// NOLINT
ALWAYS_INLINE friend bool operator ==(const Iterator & left, const Iterator & right) { return left.it == right.it; }
ALWAYS_INLINE friend bool operator !=(const Iterator & left, const Iterator & right) { return !(left == right); }
private:
rapidjson::Value::ConstValueIterator it;
};
ALWAYS_INLINE Array(const rapidjson::Value & value_) : ptr(&value_) {} /// NOLINT
ALWAYS_INLINE Iterator begin() const { return ptr->Begin(); }
ALWAYS_INLINE Iterator end() const { return ptr->End(); }
ALWAYS_INLINE size_t size() const { return ptr->Size(); }
ALWAYS_INLINE Element operator[](size_t index) const { assert(index < size()); return *(ptr->Begin() + index); }
private:
const rapidjson::Value * ptr = nullptr;
};
using KeyValuePair = std::pair<std::string_view, Element>;
/// References an object in a JSON document.
class Object
{
public:
class Iterator
{
public:
ALWAYS_INLINE Iterator(const rapidjson::Value::ConstMemberIterator & it_) : it(it_) {} /// NOLINT
ALWAYS_INLINE KeyValuePair operator *() const { std::string_view key{it->name.GetString(), it->name.GetStringLength()}; return {key, it->value}; }
ALWAYS_INLINE Iterator & operator ++() { ++it; return *this; }
ALWAYS_INLINE Iterator operator ++(int) { auto res = *this; ++it; return res; } /// NOLINT
ALWAYS_INLINE friend bool operator ==(const Iterator & left, const Iterator & right) { return left.it == right.it; }
ALWAYS_INLINE friend bool operator !=(const Iterator & left, const Iterator & right) { return !(left == right); }
private:
rapidjson::Value::ConstMemberIterator it;
};
ALWAYS_INLINE Object(const rapidjson::Value & value_) : ptr(&value_) {} /// NOLINT
ALWAYS_INLINE Iterator begin() const { return ptr->MemberBegin(); }
ALWAYS_INLINE Iterator end() const { return ptr->MemberEnd(); }
ALWAYS_INLINE size_t size() const { return ptr->MemberCount(); }
bool find(std::string_view key, Element & result) const
{
auto it = ptr->FindMember(rapidjson::StringRef(key.data(), key.length()));
if (it == ptr->MemberEnd())
return false;
result = it->value;
return true;
}
/// Optional: Provides access to an object's element by index.
ALWAYS_INLINE KeyValuePair operator[](size_t index) const
{
assert (index < size());
auto it = ptr->MemberBegin() + index;
std::string_view key{it->name.GetString(), it->name.GetStringLength()};
return {key, it->value};
}
private:
const rapidjson::Value * ptr = nullptr;
};
/// Parses a JSON document, returns the reference to its root element if succeeded.
bool parse(std::string_view json, Element & result)
{
rapidjson::MemoryStream ms(json.data(), json.size());
rapidjson::EncodedInputStream<rapidjson::UTF8<>, rapidjson::MemoryStream> is(ms);
document.ParseStream(is);
if (document.HasParseError() || (ms.Tell() != json.size()))
return false;
result = document;
return true;
}
#if 0
/// Optional: Allocates memory to parse JSON documents faster.
void reserve(size_t max_size);
#endif
private:
rapidjson::Document document;
};
inline ALWAYS_INLINE RapidJSONParser::Array RapidJSONParser::Element::getArray() const
{
return *ptr;
}
inline ALWAYS_INLINE RapidJSONParser::Object RapidJSONParser::Element::getObject() const
{
return *ptr;
}
}
#endif
|
