/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* vim: set ts=8 sts=2 et sw=2 tw=80: */ /* 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/. */ /* The long avoided variant support for xpcom. */ #ifndef nsVariant_h #define nsVariant_h #include "nsIVariant.h" #include "nsStringFwd.h" #include "mozilla/Attributes.h" class nsCycleCollectionTraversalCallback; /** * 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 type that nsIVariant implementors *may* use * to hold underlying data. It has no methods. So, its use requires no linkage * to the xpcom module. */ struct nsDiscriminatedUnion { 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. * * This class also has static helper methods that nsIVariant *implementors* can * use to help them do all the 'standard' nsIVariant data conversions. */ class nsVariant final : public nsIWritableVariant { public: NS_DECL_ISUPPORTS NS_DECL_NSIVARIANT NS_DECL_NSIWRITABLEVARIANT nsVariant(); static nsresult Initialize(nsDiscriminatedUnion* aData); static nsresult Cleanup(nsDiscriminatedUnion* aData); static nsresult ConvertToInt8(const nsDiscriminatedUnion& aData, uint8_t* aResult); static nsresult ConvertToInt16(const nsDiscriminatedUnion& aData, int16_t* aResult); static nsresult ConvertToInt32(const nsDiscriminatedUnion& aData, int32_t* aResult); static nsresult ConvertToInt64(const nsDiscriminatedUnion& aData, int64_t* aResult); static nsresult ConvertToUint8(const nsDiscriminatedUnion& aData, uint8_t* aResult); static nsresult ConvertToUint16(const nsDiscriminatedUnion& aData, uint16_t* aResult); static nsresult ConvertToUint32(const nsDiscriminatedUnion& aData, uint32_t* aResult); static nsresult ConvertToUint64(const nsDiscriminatedUnion& aData, uint64_t* aResult); static nsresult ConvertToFloat(const nsDiscriminatedUnion& aData, float* aResult); static nsresult ConvertToDouble(const nsDiscriminatedUnion& aData, double* aResult); static nsresult ConvertToBool(const nsDiscriminatedUnion& aData, bool* aResult); static nsresult ConvertToChar(const nsDiscriminatedUnion& aData, char* aResult); static nsresult ConvertToWChar(const nsDiscriminatedUnion& aData, char16_t* aResult); static nsresult ConvertToID(const nsDiscriminatedUnion& aData, nsID* aResult); static nsresult ConvertToAString(const nsDiscriminatedUnion& aData, nsAString& aResult); static nsresult ConvertToAUTF8String(const nsDiscriminatedUnion& aData, nsAUTF8String& aResult); static nsresult ConvertToACString(const nsDiscriminatedUnion& aData, nsACString& aResult); static nsresult ConvertToString(const nsDiscriminatedUnion& aData, char** aResult); static nsresult ConvertToWString(const nsDiscriminatedUnion& aData, char16_t** aResult); static nsresult ConvertToISupports(const nsDiscriminatedUnion& aData, nsISupports** aResult); static nsresult ConvertToInterface(const nsDiscriminatedUnion& aData, nsIID** aIID, void** aInterface); static nsresult ConvertToArray(const nsDiscriminatedUnion& aData, uint16_t* aType, nsIID* aIID, uint32_t* aCount, void** aPtr); static nsresult ConvertToStringWithSize(const nsDiscriminatedUnion& aData, uint32_t* aSize, char** aStr); static nsresult ConvertToWStringWithSize(const nsDiscriminatedUnion& aData, uint32_t* aSize, char16_t** aStr); static nsresult SetFromVariant(nsDiscriminatedUnion* aData, nsIVariant* aValue); static nsresult SetFromInt8(nsDiscriminatedUnion* aData, uint8_t aValue); static nsresult SetFromInt16(nsDiscriminatedUnion* aData, int16_t aValue); static nsresult SetFromInt32(nsDiscriminatedUnion* aData, int32_t aValue); static nsresult SetFromInt64(nsDiscriminatedUnion* aData, int64_t aValue); static nsresult SetFromUint8(nsDiscriminatedUnion* aData, uint8_t aValue); static nsresult SetFromUint16(nsDiscriminatedUnion* aData, uint16_t aValue); static nsresult SetFromUint32(nsDiscriminatedUnion* aData, uint32_t aValue); static nsresult SetFromUint64(nsDiscriminatedUnion* aData, uint64_t aValue); static nsresult SetFromFloat(nsDiscriminatedUnion* aData, float aValue); static nsresult SetFromDouble(nsDiscriminatedUnion* aData, double aValue); static nsresult SetFromBool(nsDiscriminatedUnion* aData, bool aValue); static nsresult SetFromChar(nsDiscriminatedUnion* aData, char aValue); static nsresult SetFromWChar(nsDiscriminatedUnion* aData, char16_t aValue); static nsresult SetFromID(nsDiscriminatedUnion* aData, const nsID& aValue); static nsresult SetFromAString(nsDiscriminatedUnion* aData, const nsAString& aValue); static nsresult SetFromAUTF8String(nsDiscriminatedUnion* aData, const nsAUTF8String& aValue); static nsresult SetFromACString(nsDiscriminatedUnion* aData, const nsACString& aValue); static nsresult SetFromString(nsDiscriminatedUnion* aData, const char* aValue); static nsresult SetFromWString(nsDiscriminatedUnion* aData, const char16_t* aValue); static nsresult SetFromISupports(nsDiscriminatedUnion* aData, nsISupports* aValue); static nsresult SetFromInterface(nsDiscriminatedUnion* aData, const nsIID& aIID, nsISupports* aValue); static nsresult SetFromArray(nsDiscriminatedUnion* aData, uint16_t aType, const nsIID* aIID, uint32_t aCount, void* aValue); static nsresult SetFromStringWithSize(nsDiscriminatedUnion* aData, uint32_t aSize, const char* aValue); static nsresult SetFromWStringWithSize(nsDiscriminatedUnion* aData, uint32_t aSize, const char16_t* aValue); // Like SetFromWStringWithSize, but leaves the string uninitialized. It does // does write the null-terminator. static nsresult AllocateWStringWithSize(nsDiscriminatedUnion* aData, uint32_t aSize); static nsresult SetToVoid(nsDiscriminatedUnion* aData); static nsresult SetToEmpty(nsDiscriminatedUnion* aData); static nsresult SetToEmptyArray(nsDiscriminatedUnion* aData); static void Traverse(const nsDiscriminatedUnion& aData, nsCycleCollectionTraversalCallback& aCb); private: ~nsVariant(); protected: nsDiscriminatedUnion mData; bool mWritable; }; /** * 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