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
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
|
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef nsVariant_h
#define nsVariant_h
#include "nsIVariant.h"
#include "nsStringFwd.h"
#include "mozilla/Attributes.h"
#include "nsCycleCollectionParticipant.h"
/**
* Map the nsAUTF8String, nsUTF8String classes to the nsACString and
* nsCString classes respectively for now. These defines need to be removed
* once Jag lands his nsUTF8String implementation.
*/
#define nsAUTF8String nsACString
#define nsUTF8String nsCString
#define PromiseFlatUTF8String PromiseFlatCString
/**
* nsDiscriminatedUnion is a class that nsIVariant implementors can use
* to hold the underlying data.
*/
class nsDiscriminatedUnion
{
public:
nsDiscriminatedUnion() : mType(nsIDataType::VTYPE_EMPTY) {}
nsDiscriminatedUnion(const nsDiscriminatedUnion&) = delete;
nsDiscriminatedUnion(nsDiscriminatedUnion&&) = delete;
~nsDiscriminatedUnion() { Cleanup(); }
nsDiscriminatedUnion& operator=(const nsDiscriminatedUnion&) = delete;
nsDiscriminatedUnion& operator=(nsDiscriminatedUnion&&) = delete;
void Cleanup();
uint16_t GetType() const { return mType; }
[[nodiscard]] nsresult ConvertToInt8(uint8_t* aResult) const;
[[nodiscard]] nsresult ConvertToInt16(int16_t* aResult) const;
[[nodiscard]] nsresult ConvertToInt32(int32_t* aResult) const;
[[nodiscard]] nsresult ConvertToInt64(int64_t* aResult) const;
[[nodiscard]] nsresult ConvertToUint8(uint8_t* aResult) const;
[[nodiscard]] nsresult ConvertToUint16(uint16_t* aResult) const;
[[nodiscard]] nsresult ConvertToUint32(uint32_t* aResult) const;
[[nodiscard]] nsresult ConvertToUint64(uint64_t* aResult) const;
[[nodiscard]] nsresult ConvertToFloat(float* aResult) const;
[[nodiscard]] nsresult ConvertToDouble(double* aResult) const;
[[nodiscard]] nsresult ConvertToBool(bool* aResult) const;
[[nodiscard]] nsresult ConvertToChar(char* aResult) const;
[[nodiscard]] nsresult ConvertToWChar(char16_t* aResult) const;
[[nodiscard]] nsresult ConvertToID(nsID* aResult) const;
[[nodiscard]] nsresult ConvertToAString(nsAString& aResult) const;
[[nodiscard]] nsresult ConvertToAUTF8String(nsAUTF8String& aResult) const;
[[nodiscard]] nsresult ConvertToACString(nsACString& aResult) const;
[[nodiscard]] nsresult ConvertToString(char** aResult) const;
[[nodiscard]] nsresult ConvertToWString(char16_t** aResult) const;
[[nodiscard]] nsresult ConvertToStringWithSize(uint32_t* aSize, char** aStr) const;
[[nodiscard]] nsresult ConvertToWStringWithSize(uint32_t* aSize, char16_t** aStr) const;
[[nodiscard]] nsresult ConvertToISupports(nsISupports** aResult) const;
[[nodiscard]] nsresult ConvertToInterface(nsIID** aIID, void** aInterface) const;
[[nodiscard]] nsresult ConvertToArray(uint16_t* aType, nsIID* aIID,
uint32_t* aCount, void** aPtr) const;
[[nodiscard]] nsresult SetFromVariant(nsIVariant* aValue);
void SetFromInt8(uint8_t aValue);
void SetFromInt16(int16_t aValue);
void SetFromInt32(int32_t aValue);
void SetFromInt64(int64_t aValue);
void SetFromUint8(uint8_t aValue);
void SetFromUint16(uint16_t aValue);
void SetFromUint32(uint32_t aValue);
void SetFromUint64(uint64_t aValue);
void SetFromFloat(float aValue);
void SetFromDouble(double aValue);
void SetFromBool(bool aValue);
void SetFromChar(char aValue);
void SetFromWChar(char16_t aValue);
void SetFromID(const nsID& aValue);
void SetFromAString(const nsAString& aValue);
void SetFromDOMString(const nsAString& aValue);
void SetFromAUTF8String(const nsAUTF8String& aValue);
void SetFromACString(const nsACString& aValue);
[[nodiscard]] nsresult SetFromString(const char* aValue);
[[nodiscard]] nsresult SetFromWString(const char16_t* aValue);
void SetFromISupports(nsISupports* aValue);
void SetFromInterface(const nsIID& aIID, nsISupports* aValue);
[[nodiscard]] nsresult SetFromArray(uint16_t aType, const nsIID* aIID,
uint32_t aCount, void* aValue);
[[nodiscard]] nsresult SetFromStringWithSize(uint32_t aSize,
const char* aValue);
[[nodiscard]] nsresult SetFromWStringWithSize(uint32_t aSize,
const char16_t* aValue);
// Like SetFromWStringWithSize, but leaves the string uninitialized. It does
// does write the null-terminator.
void AllocateWStringWithSize(uint32_t aSize);
void SetToVoid();
void SetToEmpty();
void SetToEmptyArray();
void Traverse(nsCycleCollectionTraversalCallback& aCb) const;
private:
[[nodiscard]] nsresult
ToManageableNumber(nsDiscriminatedUnion* aOutData) const;
void FreeArray();
[[nodiscard]] bool String2ID(nsID* aPid) const;
[[nodiscard]] nsresult ToString(nsACString& aOutString) const;
public:
union
{
int8_t mInt8Value;
int16_t mInt16Value;
int32_t mInt32Value;
int64_t mInt64Value;
uint8_t mUint8Value;
uint16_t mUint16Value;
uint32_t mUint32Value;
uint64_t mUint64Value;
float mFloatValue;
double mDoubleValue;
bool mBoolValue;
char mCharValue;
char16_t mWCharValue;
nsIID mIDValue;
nsAString* mAStringValue;
nsAUTF8String* mUTF8StringValue;
nsACString* mCStringValue;
struct
{
// This is an owning reference that cannot be an nsCOMPtr because
// nsDiscriminatedUnion needs to be POD. AddRef/Release are manually
// called on this.
nsISupports* MOZ_OWNING_REF mInterfaceValue;
nsIID mInterfaceID;
} iface;
struct
{
nsIID mArrayInterfaceID;
void* mArrayValue;
uint32_t mArrayCount;
uint16_t mArrayType;
} array;
struct
{
char* mStringValue;
uint32_t mStringLength;
} str;
struct
{
char16_t* mWStringValue;
uint32_t mWStringLength;
} wstr;
} u;
uint16_t mType;
};
/**
* nsVariant implements the generic variant support. The xpcom module registers
* a factory (see NS_VARIANT_CONTRACTID in nsIVariant.idl) that will create
* these objects. They are created 'empty' and 'writable'.
*
* nsIVariant users won't usually need to see this class.
*/
class nsVariantBase : public nsIWritableVariant
{
public:
NS_DECL_NSIVARIANT
NS_DECL_NSIWRITABLEVARIANT
nsVariantBase();
protected:
~nsVariantBase() {};
nsDiscriminatedUnion mData;
bool mWritable;
};
class nsVariant final : public nsVariantBase
{
public:
NS_DECL_ISUPPORTS
nsVariant() {};
private:
~nsVariant() {};
};
class nsVariantCC final : public nsVariantBase
{
public:
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_CLASS(nsVariantCC)
nsVariantCC() {};
private:
~nsVariantCC() {};
};
/**
* Users of nsIVariant should be using the contractID and not this CID.
* - see NS_VARIANT_CONTRACTID in nsIVariant.idl.
*/
#define NS_VARIANT_CID \
{ /* 0D6EA1D0-879C-11d5-90EF-0010A4E73D9A */ \
0xd6ea1d0, \
0x879c, \
0x11d5, \
{0x90, 0xef, 0x0, 0x10, 0xa4, 0xe7, 0x3d, 0x9a}}
#endif // nsVariant_h
|
