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- /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; c-file-offsets: ((substatement-open . 0)) -*- */
- /* ***** BEGIN LICENSE BLOCK *****
- * Version: MPL 1.1/GPL 2.0/LGPL 2.1
- *
- * The contents of this file are subject to the Mozilla Public License Version
- * 1.1 (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- * http://www.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
- * for the specific language governing rights and limitations under the
- * License.
- *
- * The Original Code is mozilla.org code.
- *
- * The Initial Developer of the Original Code is
- * Netscape Communications Corporation.
- * Portions created by the Initial Developer are Copyright (C) 1998
- * the Initial Developer. All Rights Reserved.
- *
- * Contributor(s):
- *
- * Alternatively, the contents of this file may be used under the terms of
- * either of the GNU General Public License Version 2 or later (the "GPL"),
- * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
- * in which case the provisions of the GPL or the LGPL are applicable instead
- * of those above. If you wish to allow use of your version of this file only
- * under the terms of either the GPL or the LGPL, and not to allow others to
- * use your version of this file under the terms of the MPL, indicate your
- * decision by deleting the provisions above and replace them with the notice
- * and other provisions required by the GPL or the LGPL. If you do not delete
- * the provisions above, a recipient may use your version of this file under
- * the terms of any one of the MPL, the GPL or the LGPL.
- *
- * ***** END LICENSE BLOCK ***** */
- #ifndef nsVoidArray_h___
- #define nsVoidArray_h___
-
- //#define DEBUG_VOIDARRAY 1
-
- #include "nscore.h"
- #include "nsAString.h"
-
- // Comparator callback function for sorting array values.
- typedef int (* PR_CALLBACK nsVoidArrayComparatorFunc)
- (const void* aElement1, const void* aElement2, void* aData);
-
- // Enumerator callback function. Return PR_FALSE to stop
- typedef PRBool (* PR_CALLBACK nsVoidArrayEnumFunc)(void* aElement, void *aData);
-
- /// A basic zero-based array of void*'s that manages its own memory
- class NS_COM nsVoidArray {
- public:
- nsVoidArray();
- nsVoidArray(PRInt32 aCount); // initial count of aCount elements set to nsnull
- virtual ~nsVoidArray();
-
- nsVoidArray& operator=(const nsVoidArray& other);
-
- inline PRInt32 Count() const {
- return mImpl ? mImpl->mCount : 0;
- }
- // returns the max number that can be held without allocating
- inline PRInt32 GetArraySize() const {
- return mImpl ? (PRInt32(mImpl->mBits) & kArraySizeMask) : 0;
- }
-
- void* FastElementAt(PRInt32 aIndex) const
- {
- NS_ASSERTION(0 <= aIndex && aIndex < Count(), "index out of range");
- return mImpl->mArray[aIndex];
- }
-
- // This both asserts and bounds-checks, because (1) we don't want
- // people to write bad code, but (2) we don't want to change it to
- // crashing for backwards compatibility. See bug 96108.
- void* ElementAt(PRInt32 aIndex) const
- {
- NS_ASSERTION(0 <= aIndex && aIndex < Count(), "index out of range");
- return SafeElementAt(aIndex);
- }
-
- // bounds-checked version
- void* SafeElementAt(PRInt32 aIndex) const
- {
- if (PRUint32(aIndex) >= PRUint32(Count())) // handles aIndex < 0 too
- {
- return nsnull;
- }
- // The bounds check ensures mImpl is non-null.
- return mImpl->mArray[aIndex];
- }
-
- void* operator[](PRInt32 aIndex) const { return ElementAt(aIndex); }
-
- PRInt32 IndexOf(void* aPossibleElement) const;
-
- PRBool InsertElementAt(void* aElement, PRInt32 aIndex);
- PRBool InsertElementsAt(const nsVoidArray &other, PRInt32 aIndex);
-
- PRBool ReplaceElementAt(void* aElement, PRInt32 aIndex);
-
- // useful for doing LRU arrays, sorting, etc
- PRBool MoveElement(PRInt32 aFrom, PRInt32 aTo);
-
- PRBool AppendElement(void* aElement) {
- return InsertElementAt(aElement, Count());
- }
-
- PRBool AppendElements(nsVoidArray& aElements) {
- return InsertElementsAt(aElements, Count());
- }
-
- PRBool RemoveElement(void* aElement);
- PRBool RemoveElementsAt(PRInt32 aIndex, PRInt32 aCount);
- PRBool RemoveElementAt(PRInt32 aIndex) { return RemoveElementsAt(aIndex,1); }
-
- virtual void Clear();
-
- virtual PRBool SizeTo(PRInt32 aMin);
- // Subtly different - Compact() tries to be smart about whether we
- // should reallocate the array; SizeTo() just does it.
- virtual void Compact();
-
- void Sort(nsVoidArrayComparatorFunc aFunc, void* aData);
-
- PRBool EnumerateForwards(nsVoidArrayEnumFunc aFunc, void* aData);
- PRBool EnumerateBackwards(nsVoidArrayEnumFunc aFunc, void* aData);
-
- protected:
- virtual PRBool GrowArrayBy(PRInt32 aGrowBy);
-
- struct Impl {
- /**
- * Packed bits. The low 31 bits are the array's size.
- * The highest bit is a flag that indicates
- * whether or not we "own" mArray, and must free() it when
- * destroyed.
- */
- PRUint32 mBits;
-
- /**
- * The number of elements in the array
- */
- PRInt32 mCount;
-
- /**
- * Array data, padded out to the actual size of the array.
- */
- void* mArray[1];
- };
-
- Impl* mImpl;
- #if DEBUG_VOIDARRAY
- PRInt32 mMaxCount;
- PRInt32 mMaxSize;
- PRBool mIsAuto;
- #endif
-
- enum {
- kArrayOwnerMask = 1 << 31,
- kArraySizeMask = ~kArrayOwnerMask
- };
-
-
- // bit twiddlers
- void SetArray(Impl *newImpl, PRInt32 aSize, PRInt32 aCount, PRBool owner);
- inline PRBool IsArrayOwner() const {
- return mImpl ? (PRBool(mImpl->mBits) & kArrayOwnerMask) : PR_FALSE;
- }
-
- private:
- /// Copy constructors are not allowed
- nsVoidArray(const nsVoidArray& other);
- };
-
-
- // A zero-based array with a bit of automatic internal storage
- class NS_COM nsAutoVoidArray : public nsVoidArray {
- public:
- nsAutoVoidArray();
- void Clear();
-
- virtual PRBool SizeTo(PRInt32 aMin);
- virtual void Compact();
-
- protected:
- // The internal storage
- enum { kAutoBufSize = 8 };
- char mAutoBuf[sizeof(Impl) + (kAutoBufSize - 1) * sizeof(void*)];
- };
-
-
- class nsString;
-
- typedef int (* PR_CALLBACK nsStringArrayComparatorFunc)
- (const nsString* aElement1, const nsString* aElement2, void* aData);
-
- typedef PRBool (*nsStringArrayEnumFunc)(nsString& aElement, void *aData);
-
- class NS_COM nsStringArray: protected nsVoidArray
- {
- public:
- nsStringArray(void);
- nsStringArray(PRInt32 aCount); // Storage for aCount elements will be pre-allocated
- virtual ~nsStringArray(void);
-
- nsStringArray& operator=(const nsStringArray& other);
-
- PRInt32 Count(void) const {
- return nsVoidArray::Count();
- }
-
- void StringAt(PRInt32 aIndex, nsAString& aString) const;
- nsString* StringAt(PRInt32 aIndex) const;
- nsString* operator[](PRInt32 aIndex) const { return StringAt(aIndex); }
-
- PRInt32 IndexOf(const nsAString& aPossibleString) const;
-
- PRBool InsertStringAt(const nsAString& aString, PRInt32 aIndex);
-
- PRBool ReplaceStringAt(const nsAString& aString, PRInt32 aIndex);
-
- PRBool AppendString(const nsAString& aString) {
- return InsertStringAt(aString, Count());
- }
-
- PRBool RemoveString(const nsAString& aString);
- PRBool RemoveStringAt(PRInt32 aIndex);
- void Clear(void);
-
- void Compact(void) {
- nsVoidArray::Compact();
- }
-
- void Sort(void);
- void Sort(nsStringArrayComparatorFunc aFunc, void* aData);
-
- PRBool EnumerateForwards(nsStringArrayEnumFunc aFunc, void* aData);
- PRBool EnumerateBackwards(nsStringArrayEnumFunc aFunc, void* aData);
-
- private:
- /// Copy constructors are not allowed
- nsStringArray(const nsStringArray& other);
- };
-
-
- class nsCString;
-
- typedef int (* PR_CALLBACK nsCStringArrayComparatorFunc)
- (const nsCString* aElement1, const nsCString* aElement2, void* aData);
-
- typedef PRBool (*nsCStringArrayEnumFunc)(nsCString& aElement, void *aData);
-
- class NS_COM nsCStringArray: protected nsVoidArray
- {
- public:
- nsCStringArray(void);
- nsCStringArray(PRInt32 aCount); // Storage for aCount elements will be pre-allocated
- virtual ~nsCStringArray(void);
-
- nsCStringArray& operator=(const nsCStringArray& other);
-
- // Parses a given string using the delimiter passed in. If the array
- // already has some elements, items parsed from string will be appended
- // to array. For example, array.ParseString("a,b,c", ","); will add strings
- // "a", "b" and "c" to the array. Parsing process has the same tokenizing
- // behavior as strtok().
- void ParseString(const char* string, const char* delimiter);
-
- PRInt32 Count(void) const {
- return nsVoidArray::Count();
- }
-
- void CStringAt(PRInt32 aIndex, nsACString& aCString) const;
- nsCString* CStringAt(PRInt32 aIndex) const;
- nsCString* operator[](PRInt32 aIndex) const { return CStringAt(aIndex); }
-
- PRInt32 IndexOf(const nsACString& aPossibleString) const;
- PRInt32 IndexOfIgnoreCase(const nsACString& aPossibleString) const;
-
- PRBool InsertCStringAt(const nsACString& aCString, PRInt32 aIndex);
-
- PRBool ReplaceCStringAt(const nsACString& aCString, PRInt32 aIndex);
-
- PRBool AppendCString(const nsACString& aCString) {
- return InsertCStringAt(aCString, Count());
- }
-
- PRBool RemoveCString(const nsACString& aCString);
- PRBool RemoveCStringIgnoreCase(const nsACString& aCString);
- PRBool RemoveCStringAt(PRInt32 aIndex);
- void Clear(void);
-
- void Compact(void) {
- nsVoidArray::Compact();
- }
-
- void Sort(void);
- void SortIgnoreCase(void);
- void Sort(nsCStringArrayComparatorFunc aFunc, void* aData);
-
- PRBool EnumerateForwards(nsCStringArrayEnumFunc aFunc, void* aData);
- PRBool EnumerateBackwards(nsCStringArrayEnumFunc aFunc, void* aData);
-
- private:
- /// Copy constructors are not allowed
- nsCStringArray(const nsCStringArray& other);
- };
-
-
- //===================================================================
- // nsSmallVoidArray is not a general-purpose replacement for
- // ns(Auto)VoidArray because there is (some) extra CPU overhead for arrays
- // larger than 1 element, though not a lot. It is appropriate for
- // space-sensitive uses where sizes of 0 or 1 are moderately common or
- // more, and where we're NOT storing arbitrary integers or arbitrary
- // pointers.
-
- // NOTE: nsSmallVoidArray can ONLY be used for holding items that always
- // have the low bit as a 0 - i.e. element & 1 == 0. This happens to be
- // true for allocated and object pointers for all the architectures we run
- // on, but conceivably there might be some architectures/compilers for
- // which it is NOT true. We know this works for all existing architectures
- // because if it didn't then nsCheapVoidArray would have failed. Also note
- // that we will ASSERT if this assumption is violated in DEBUG builds.
-
- // XXX we're really re-implementing the whole nsVoidArray interface here -
- // some form of abstract class would be useful
-
- // I disagree on the abstraction here. If the point of this class is to be
- // as small as possible, and no one will ever derive from it, as I found
- // today, there should not be any virtualness to it to avoid the vtable
- // ptr overhead.
-
- class NS_COM nsSmallVoidArray
- {
- public:
- nsSmallVoidArray();
- ~nsSmallVoidArray();
-
- nsSmallVoidArray& operator=(nsSmallVoidArray& other);
- void* operator[](PRInt32 aIndex) const { return ElementAt(aIndex); }
-
- PRInt32 GetArraySize() const;
-
- PRInt32 Count() const;
- void* ElementAt(PRInt32 aIndex) const;
- void* SafeElementAt(PRInt32 aIndex) const {
- // let compiler inline; it may be able to remove these checks
- if (aIndex < 0 || aIndex >= Count())
- return nsnull;
- return ElementAt(aIndex);
- }
- PRInt32 IndexOf(void* aPossibleElement) const;
- PRBool InsertElementAt(void* aElement, PRInt32 aIndex);
- PRBool InsertElementsAt(const nsVoidArray &other, PRInt32 aIndex);
- PRBool ReplaceElementAt(void* aElement, PRInt32 aIndex);
- PRBool MoveElement(PRInt32 aFrom, PRInt32 aTo);
- PRBool AppendElement(void* aElement);
- PRBool AppendElements(nsVoidArray& aElements) {
- return InsertElementsAt(aElements, Count());
- }
- PRBool RemoveElement(void* aElement);
- PRBool RemoveElementsAt(PRInt32 aIndex, PRInt32 aCount);
- PRBool RemoveElementAt(PRInt32 aIndex);
-
- void Clear();
- PRBool SizeTo(PRInt32 aMin);
- void Compact();
- void Sort(nsVoidArrayComparatorFunc aFunc, void* aData);
-
- PRBool EnumerateForwards(nsVoidArrayEnumFunc aFunc, void* aData);
- PRBool EnumerateBackwards(nsVoidArrayEnumFunc aFunc, void* aData);
-
- private:
- typedef unsigned long PtrBits;
-
- PRBool HasSingleChild() const
- {
- return (mChildren && (PtrBits(mChildren) & 0x1));
- }
- PRBool HasVector() const
- {
- return (mChildren && !(PtrBits(mChildren) & 0x1));
- }
- void* GetSingleChild() const
- {
- return (mChildren ? ((void*)(PtrBits(mChildren) & ~0x1)) : nsnull);
- }
- void SetSingleChild(void *aChild);
- nsVoidArray* GetChildVector() const
- {
- return (nsVoidArray*)mChildren;
- }
- nsVoidArray* SwitchToVector();
-
- // A tagged pointer that's either a pointer to a single child
- // or a pointer to a vector of multiple children. This is a space
- // optimization since a large number of containers have only a
- // single child.
- void *mChildren;
- };
-
- #endif /* nsVoidArray_h___ */
-