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435 lines
13 KiB
C++
435 lines
13 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; c-file-offsets: ((substatement-open . 0)) -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsVoidArray_h___
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#define nsVoidArray_h___
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//#define DEBUG_VOIDARRAY 1
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#include "nscore.h"
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#include "nsStringGlue.h"
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#include "nsDebug.h"
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// Comparator callback function for sorting array values.
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typedef int (* nsVoidArrayComparatorFunc)
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(const void* aElement1, const void* aElement2, void* aData);
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// Enumerator callback function. Return PR_FALSE to stop
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typedef PRBool (* nsVoidArrayEnumFunc)(void* aElement, void *aData);
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/// A basic zero-based array of void*'s that manages its own memory
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class NS_COM_GLUE nsVoidArray {
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public:
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nsVoidArray();
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nsVoidArray(PRInt32 aCount); // initial count of aCount elements set to nsnull
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~nsVoidArray();
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nsVoidArray& operator=(const nsVoidArray& other);
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inline PRInt32 Count() const {
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return mImpl ? mImpl->mCount : 0;
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}
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// returns the max number that can be held without allocating
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inline PRInt32 GetArraySize() const {
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return mImpl ? (PRInt32(mImpl->mBits) & kArraySizeMask) : 0;
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}
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void* FastElementAt(PRInt32 aIndex) const
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{
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NS_ASSERTION(0 <= aIndex && aIndex < Count(), "nsVoidArray::FastElementAt: index out of range");
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return mImpl->mArray[aIndex];
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}
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// This both asserts and bounds-checks, because (1) we don't want
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// people to write bad code, but (2) we don't want to change it to
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// crashing for backwards compatibility. See bug 96108.
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void* ElementAt(PRInt32 aIndex) const
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{
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NS_ASSERTION(0 <= aIndex && aIndex < Count(), "nsVoidArray::ElementAt: index out of range");
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return SafeElementAt(aIndex);
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}
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// bounds-checked version
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void* SafeElementAt(PRInt32 aIndex) const
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{
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if (PRUint32(aIndex) >= PRUint32(Count())) // handles aIndex < 0 too
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{
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return nsnull;
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}
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// The bounds check ensures mImpl is non-null.
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return mImpl->mArray[aIndex];
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}
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void* operator[](PRInt32 aIndex) const { return ElementAt(aIndex); }
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PRInt32 IndexOf(void* aPossibleElement) const;
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PRBool InsertElementAt(void* aElement, PRInt32 aIndex);
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PRBool InsertElementsAt(const nsVoidArray &other, PRInt32 aIndex);
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PRBool ReplaceElementAt(void* aElement, PRInt32 aIndex);
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// useful for doing LRU arrays, sorting, etc
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PRBool MoveElement(PRInt32 aFrom, PRInt32 aTo);
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PRBool AppendElement(void* aElement) {
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return InsertElementAt(aElement, Count());
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}
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PRBool AppendElements(nsVoidArray& aElements) {
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return InsertElementsAt(aElements, Count());
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}
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PRBool RemoveElement(void* aElement);
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PRBool RemoveElementsAt(PRInt32 aIndex, PRInt32 aCount);
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PRBool RemoveElementAt(PRInt32 aIndex) { return RemoveElementsAt(aIndex,1); }
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void Clear();
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PRBool SizeTo(PRInt32 aMin);
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// Subtly different - Compact() tries to be smart about whether we
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// should reallocate the array; SizeTo() always reallocates.
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void Compact();
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void Sort(nsVoidArrayComparatorFunc aFunc, void* aData);
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PRBool EnumerateForwards(nsVoidArrayEnumFunc aFunc, void* aData);
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PRBool EnumerateBackwards(nsVoidArrayEnumFunc aFunc, void* aData);
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protected:
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PRBool GrowArrayBy(PRInt32 aGrowBy);
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struct Impl {
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/**
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* Packed bits. The low 30 bits are the array's size.
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* The two highest bits indicate whether or not we "own" mImpl and
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* must free() it when destroyed, and whether we have a preallocated
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* nsAutoVoidArray buffer.
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*/
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PRUint32 mBits;
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/**
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* The number of elements in the array
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*/
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PRInt32 mCount;
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/**
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* Array data, padded out to the actual size of the array.
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*/
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void* mArray[1];
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};
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Impl* mImpl;
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#if DEBUG_VOIDARRAY
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PRInt32 mMaxCount;
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PRInt32 mMaxSize;
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PRBool mIsAuto;
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#endif
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enum {
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kArrayOwnerMask = 1 << 31,
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kArrayHasAutoBufferMask = 1 << 30,
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kArraySizeMask = ~(kArrayOwnerMask | kArrayHasAutoBufferMask)
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};
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enum { kAutoBufSize = 8 };
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// bit twiddlers
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void SetArray(Impl *newImpl, PRInt32 aSize, PRInt32 aCount, PRBool aOwner,
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PRBool aHasAuto);
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inline PRBool IsArrayOwner() const {
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return mImpl && (mImpl->mBits & kArrayOwnerMask);
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}
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inline PRBool HasAutoBuffer() const {
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return mImpl && (mImpl->mBits & kArrayHasAutoBufferMask);
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}
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private:
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/// Copy constructors are not allowed
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nsVoidArray(const nsVoidArray& other);
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};
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// A zero-based array with a bit of automatic internal storage
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class NS_COM_GLUE nsAutoVoidArray : public nsVoidArray {
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public:
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nsAutoVoidArray();
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void ResetToAutoBuffer()
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{
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SetArray(reinterpret_cast<Impl*>(mAutoBuf), kAutoBufSize, 0, PR_FALSE,
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PR_TRUE);
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}
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protected:
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// The internal storage
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char mAutoBuf[sizeof(Impl) + (kAutoBufSize - 1) * sizeof(void*)];
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};
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class nsString;
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typedef int (* nsStringArrayComparatorFunc)
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(const nsString* aElement1, const nsString* aElement2, void* aData);
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typedef PRBool (*nsStringArrayEnumFunc)(nsString& aElement, void *aData);
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class NS_COM_GLUE nsStringArray: private nsVoidArray
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{
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public:
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nsStringArray(void);
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nsStringArray(PRInt32 aCount); // Storage for aCount elements will be pre-allocated
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~nsStringArray(void);
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nsStringArray& operator=(const nsStringArray& other);
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PRInt32 Count(void) const {
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return nsVoidArray::Count();
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}
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void StringAt(PRInt32 aIndex, nsAString& aString) const;
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nsString* StringAt(PRInt32 aIndex) const;
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nsString* operator[](PRInt32 aIndex) const { return StringAt(aIndex); }
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PRInt32 IndexOf(const nsAString& aPossibleString) const;
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PRBool InsertStringAt(const nsAString& aString, PRInt32 aIndex);
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PRBool ReplaceStringAt(const nsAString& aString, PRInt32 aIndex);
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PRBool AppendString(const nsAString& aString) {
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return InsertStringAt(aString, Count());
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}
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PRBool RemoveString(const nsAString& aString);
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PRBool RemoveStringAt(PRInt32 aIndex);
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void Clear(void);
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void Compact(void) {
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nsVoidArray::Compact();
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}
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void Sort(void);
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void Sort(nsStringArrayComparatorFunc aFunc, void* aData);
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PRBool EnumerateForwards(nsStringArrayEnumFunc aFunc, void* aData);
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PRBool EnumerateBackwards(nsStringArrayEnumFunc aFunc, void* aData);
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private:
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/// Copy constructors are not allowed
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nsStringArray(const nsStringArray& other);
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};
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class nsCString;
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typedef int (* nsCStringArrayComparatorFunc)
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(const nsCString* aElement1, const nsCString* aElement2, void* aData);
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typedef PRBool (*nsCStringArrayEnumFunc)(nsCString& aElement, void *aData);
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class NS_COM_GLUE nsCStringArray: private nsVoidArray
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{
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public:
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nsCStringArray(void);
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nsCStringArray(PRInt32 aCount); // Storage for aCount elements will be pre-allocated
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~nsCStringArray(void);
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nsCStringArray& operator=(const nsCStringArray& other);
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PRInt32 Count(void) const {
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return nsVoidArray::Count();
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}
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void CStringAt(PRInt32 aIndex, nsACString& aCString) const;
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nsCString* CStringAt(PRInt32 aIndex) const;
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nsCString* operator[](PRInt32 aIndex) const { return CStringAt(aIndex); }
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PRInt32 IndexOf(const nsACString& aPossibleString) const;
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#ifdef MOZILLA_INTERNAL_API
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PRInt32 IndexOfIgnoreCase(const nsACString& aPossibleString) const;
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#endif
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PRBool InsertCStringAt(const nsACString& aCString, PRInt32 aIndex);
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PRBool ReplaceCStringAt(const nsACString& aCString, PRInt32 aIndex);
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PRBool AppendCString(const nsACString& aCString) {
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return InsertCStringAt(aCString, Count());
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}
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PRBool RemoveCString(const nsACString& aCString);
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#ifdef MOZILLA_INTERNAL_API
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PRBool RemoveCStringIgnoreCase(const nsACString& aCString);
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#endif
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PRBool RemoveCStringAt(PRInt32 aIndex);
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void Clear(void);
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void Compact(void) {
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nsVoidArray::Compact();
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}
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void Sort(void);
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#ifdef MOZILLA_INTERNAL_API
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void SortIgnoreCase(void);
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#endif
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void Sort(nsCStringArrayComparatorFunc aFunc, void* aData);
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PRBool EnumerateForwards(nsCStringArrayEnumFunc aFunc, void* aData);
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PRBool EnumerateBackwards(nsCStringArrayEnumFunc aFunc, void* aData);
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private:
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/// Copy constructors are not allowed
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nsCStringArray(const nsCStringArray& other);
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};
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//===================================================================
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// nsSmallVoidArray is not a general-purpose replacement for
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// ns(Auto)VoidArray because there is (some) extra CPU overhead for arrays
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// larger than 1 element, though not a lot. It is appropriate for
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// space-sensitive uses where sizes of 0 or 1 are moderately common or
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// more, and where we're NOT storing arbitrary integers or arbitrary
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// pointers.
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// NOTE: nsSmallVoidArray can ONLY be used for holding items that always
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// have the low bit as a 0 - i.e. element & 1 == 0. This happens to be
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// true for allocated and object pointers for all the architectures we run
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// on, but conceivably there might be some architectures/compilers for
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// which it is NOT true. We know this works for all existing architectures
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// because if it didn't then nsCheapVoidArray would have failed. Also note
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// that we will ASSERT if this assumption is violated in DEBUG builds.
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// XXX we're really re-implementing the whole nsVoidArray interface here -
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// some form of abstract class would be useful
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// I disagree on the abstraction here. If the point of this class is to be
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// as small as possible, and no one will ever derive from it, as I found
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// today, there should not be any virtualness to it to avoid the vtable
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// ptr overhead.
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class NS_COM_GLUE nsSmallVoidArray : private nsVoidArray
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{
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public:
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~nsSmallVoidArray();
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nsSmallVoidArray& operator=(nsSmallVoidArray& other);
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void* operator[](PRInt32 aIndex) const { return ElementAt(aIndex); }
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PRInt32 GetArraySize() const;
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PRInt32 Count() const;
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void* FastElementAt(PRInt32 aIndex) const;
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// This both asserts and bounds-checks, because (1) we don't want
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// people to write bad code, but (2) we don't want to change it to
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// crashing for backwards compatibility. See bug 96108.
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void* ElementAt(PRInt32 aIndex) const
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{
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NS_ASSERTION(0 <= aIndex && aIndex < Count(), "nsSmallVoidArray::ElementAt: index out of range");
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return SafeElementAt(aIndex);
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}
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void* SafeElementAt(PRInt32 aIndex) const {
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// let compiler inline; it may be able to remove these checks
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if (PRUint32(aIndex) >= PRUint32(Count())) // handles aIndex < 0 too
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{
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return nsnull;
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}
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return FastElementAt(aIndex);
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}
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PRInt32 IndexOf(void* aPossibleElement) const;
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PRBool InsertElementAt(void* aElement, PRInt32 aIndex);
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PRBool InsertElementsAt(const nsVoidArray &other, PRInt32 aIndex);
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PRBool ReplaceElementAt(void* aElement, PRInt32 aIndex);
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PRBool MoveElement(PRInt32 aFrom, PRInt32 aTo);
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PRBool AppendElement(void* aElement);
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PRBool AppendElements(nsVoidArray& aElements) {
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return InsertElementsAt(aElements, Count());
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}
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PRBool RemoveElement(void* aElement);
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PRBool RemoveElementsAt(PRInt32 aIndex, PRInt32 aCount);
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PRBool RemoveElementAt(PRInt32 aIndex);
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void Clear();
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PRBool SizeTo(PRInt32 aMin);
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void Compact();
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void Sort(nsVoidArrayComparatorFunc aFunc, void* aData);
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PRBool EnumerateForwards(nsVoidArrayEnumFunc aFunc, void* aData);
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PRBool EnumerateBackwards(nsVoidArrayEnumFunc aFunc, void* aData);
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private:
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PRBool HasSingle() const
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{
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return !!(reinterpret_cast<PRWord>(mImpl) & 0x1);
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}
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void* GetSingle() const
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{
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NS_ASSERTION(HasSingle(), "wrong type");
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return reinterpret_cast<void*>
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(reinterpret_cast<PRWord>(mImpl) & ~0x1);
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}
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void SetSingle(void *aChild)
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{
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NS_ASSERTION(HasSingle() || !mImpl, "overwriting array");
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mImpl = reinterpret_cast<Impl*>
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(reinterpret_cast<PRWord>(aChild) | 0x1);
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}
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PRBool IsEmpty() const
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{
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// Note that this isn't the same as Count()==0
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return !mImpl;
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}
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const nsVoidArray* AsArray() const
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{
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NS_ASSERTION(!HasSingle(), "This is a single");
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return this;
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}
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nsVoidArray* AsArray()
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{
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NS_ASSERTION(!HasSingle(), "This is a single");
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return this;
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}
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PRBool EnsureArray();
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};
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#endif /* nsVoidArray_h___ */
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