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import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo
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Roy Tam
commit
dcd9973243
150858 changed files with 23884658 additions and 0 deletions
229
xpcom/ds/nsVariant.h
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229
xpcom/ds/nsVariant.h
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsVariant_h
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#define nsVariant_h
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#include "nsIVariant.h"
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#include "nsStringFwd.h"
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#include "mozilla/Attributes.h"
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#include "nsCycleCollectionParticipant.h"
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/**
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* Map the nsAUTF8String, nsUTF8String classes to the nsACString and
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* nsCString classes respectively for now. These defines need to be removed
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* once Jag lands his nsUTF8String implementation.
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*/
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#define nsAUTF8String nsACString
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#define nsUTF8String nsCString
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#define PromiseFlatUTF8String PromiseFlatCString
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/**
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* nsDiscriminatedUnion is a class that nsIVariant implementors can use
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* to hold the underlying data.
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*/
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class nsDiscriminatedUnion
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{
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public:
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nsDiscriminatedUnion() : mType(nsIDataType::VTYPE_EMPTY) {}
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nsDiscriminatedUnion(const nsDiscriminatedUnion&) = delete;
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nsDiscriminatedUnion(nsDiscriminatedUnion&&) = delete;
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~nsDiscriminatedUnion() { Cleanup(); }
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nsDiscriminatedUnion& operator=(const nsDiscriminatedUnion&) = delete;
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nsDiscriminatedUnion& operator=(nsDiscriminatedUnion&&) = delete;
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void Cleanup();
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uint16_t GetType() const { return mType; }
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MOZ_MUST_USE nsresult ConvertToInt8(uint8_t* aResult) const;
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MOZ_MUST_USE nsresult ConvertToInt16(int16_t* aResult) const;
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MOZ_MUST_USE nsresult ConvertToInt32(int32_t* aResult) const;
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MOZ_MUST_USE nsresult ConvertToInt64(int64_t* aResult) const;
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MOZ_MUST_USE nsresult ConvertToUint8(uint8_t* aResult) const;
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MOZ_MUST_USE nsresult ConvertToUint16(uint16_t* aResult) const;
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MOZ_MUST_USE nsresult ConvertToUint32(uint32_t* aResult) const;
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MOZ_MUST_USE nsresult ConvertToUint64(uint64_t* aResult) const;
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MOZ_MUST_USE nsresult ConvertToFloat(float* aResult) const;
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MOZ_MUST_USE nsresult ConvertToDouble(double* aResult) const;
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MOZ_MUST_USE nsresult ConvertToBool(bool* aResult) const;
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MOZ_MUST_USE nsresult ConvertToChar(char* aResult) const;
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MOZ_MUST_USE nsresult ConvertToWChar(char16_t* aResult) const;
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MOZ_MUST_USE nsresult ConvertToID(nsID* aResult) const;
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MOZ_MUST_USE nsresult ConvertToAString(nsAString& aResult) const;
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MOZ_MUST_USE nsresult ConvertToAUTF8String(nsAUTF8String& aResult) const;
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MOZ_MUST_USE nsresult ConvertToACString(nsACString& aResult) const;
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MOZ_MUST_USE nsresult ConvertToString(char** aResult) const;
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MOZ_MUST_USE nsresult ConvertToWString(char16_t** aResult) const;
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MOZ_MUST_USE nsresult ConvertToStringWithSize(uint32_t* aSize, char** aStr) const;
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MOZ_MUST_USE nsresult ConvertToWStringWithSize(uint32_t* aSize, char16_t** aStr) const;
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MOZ_MUST_USE nsresult ConvertToISupports(nsISupports** aResult) const;
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MOZ_MUST_USE nsresult ConvertToInterface(nsIID** aIID, void** aInterface) const;
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MOZ_MUST_USE nsresult ConvertToArray(uint16_t* aType, nsIID* aIID,
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uint32_t* aCount, void** aPtr) const;
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MOZ_MUST_USE nsresult SetFromVariant(nsIVariant* aValue);
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void SetFromInt8(uint8_t aValue);
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void SetFromInt16(int16_t aValue);
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void SetFromInt32(int32_t aValue);
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void SetFromInt64(int64_t aValue);
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void SetFromUint8(uint8_t aValue);
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void SetFromUint16(uint16_t aValue);
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void SetFromUint32(uint32_t aValue);
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void SetFromUint64(uint64_t aValue);
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void SetFromFloat(float aValue);
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void SetFromDouble(double aValue);
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void SetFromBool(bool aValue);
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void SetFromChar(char aValue);
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void SetFromWChar(char16_t aValue);
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void SetFromID(const nsID& aValue);
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void SetFromAString(const nsAString& aValue);
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void SetFromDOMString(const nsAString& aValue);
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void SetFromAUTF8String(const nsAUTF8String& aValue);
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void SetFromACString(const nsACString& aValue);
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MOZ_MUST_USE nsresult SetFromString(const char* aValue);
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MOZ_MUST_USE nsresult SetFromWString(const char16_t* aValue);
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void SetFromISupports(nsISupports* aValue);
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void SetFromInterface(const nsIID& aIID, nsISupports* aValue);
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MOZ_MUST_USE nsresult SetFromArray(uint16_t aType, const nsIID* aIID,
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uint32_t aCount, void* aValue);
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MOZ_MUST_USE nsresult SetFromStringWithSize(uint32_t aSize,
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const char* aValue);
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MOZ_MUST_USE nsresult SetFromWStringWithSize(uint32_t aSize,
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const char16_t* aValue);
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// Like SetFromWStringWithSize, but leaves the string uninitialized. It does
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// does write the null-terminator.
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void AllocateWStringWithSize(uint32_t aSize);
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void SetToVoid();
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void SetToEmpty();
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void SetToEmptyArray();
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void Traverse(nsCycleCollectionTraversalCallback& aCb) const;
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private:
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MOZ_MUST_USE nsresult
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ToManageableNumber(nsDiscriminatedUnion* aOutData) const;
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void FreeArray();
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MOZ_MUST_USE bool String2ID(nsID* aPid) const;
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MOZ_MUST_USE nsresult ToString(nsACString& aOutString) const;
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public:
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union
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{
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int8_t mInt8Value;
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int16_t mInt16Value;
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int32_t mInt32Value;
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int64_t mInt64Value;
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uint8_t mUint8Value;
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uint16_t mUint16Value;
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uint32_t mUint32Value;
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uint64_t mUint64Value;
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float mFloatValue;
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double mDoubleValue;
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bool mBoolValue;
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char mCharValue;
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char16_t mWCharValue;
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nsIID mIDValue;
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nsAString* mAStringValue;
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nsAUTF8String* mUTF8StringValue;
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nsACString* mCStringValue;
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struct
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{
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// This is an owning reference that cannot be an nsCOMPtr because
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// nsDiscriminatedUnion needs to be POD. AddRef/Release are manually
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// called on this.
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nsISupports* MOZ_OWNING_REF mInterfaceValue;
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nsIID mInterfaceID;
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} iface;
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struct
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{
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nsIID mArrayInterfaceID;
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void* mArrayValue;
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uint32_t mArrayCount;
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uint16_t mArrayType;
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} array;
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struct
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{
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char* mStringValue;
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uint32_t mStringLength;
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} str;
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struct
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{
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char16_t* mWStringValue;
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uint32_t mWStringLength;
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} wstr;
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} u;
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uint16_t mType;
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};
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/**
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* nsVariant implements the generic variant support. The xpcom module registers
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* a factory (see NS_VARIANT_CONTRACTID in nsIVariant.idl) that will create
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* these objects. They are created 'empty' and 'writable'.
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*
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* nsIVariant users won't usually need to see this class.
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*/
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class nsVariantBase : public nsIWritableVariant
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{
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public:
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NS_DECL_NSIVARIANT
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NS_DECL_NSIWRITABLEVARIANT
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nsVariantBase();
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protected:
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~nsVariantBase() {};
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nsDiscriminatedUnion mData;
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bool mWritable;
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};
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class nsVariant final : public nsVariantBase
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{
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public:
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NS_DECL_ISUPPORTS
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nsVariant() {};
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private:
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~nsVariant() {};
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};
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class nsVariantCC final : public nsVariantBase
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{
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public:
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NS_DECL_CYCLE_COLLECTING_ISUPPORTS
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NS_DECL_CYCLE_COLLECTION_CLASS(nsVariantCC)
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nsVariantCC() {};
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private:
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~nsVariantCC() {};
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};
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/**
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* Users of nsIVariant should be using the contractID and not this CID.
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* - see NS_VARIANT_CONTRACTID in nsIVariant.idl.
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*/
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#define NS_VARIANT_CID \
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{ /* 0D6EA1D0-879C-11d5-90EF-0010A4E73D9A */ \
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0xd6ea1d0, \
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0x879c, \
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0x11d5, \
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{0x90, 0xef, 0x0, 0x10, 0xa4, 0xe7, 0x3d, 0x9a}}
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#endif // nsVariant_h
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