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510 lines
16 KiB
C++
510 lines
16 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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/******************************************************************************************
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MODULE NOTES:
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This file contains the nsStr data structure.
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This general purpose buffer management class is used as the basis for our strings.
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It's benefits include:
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1. An efficient set of library style functions for manipulating nsStrs
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2. Support for 1 and 2 byte character strings (which can easily be increased to n)
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3. Unicode awareness and interoperability.
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*******************************************************************************************/
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#include "nsStr.h"
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#include "bufferRoutines.h"
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#include "stdio.h" //only used for printf
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static const char* kFoolMsg = "Error: Some fool overwrote the shared buffer.";
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//----------------------------------------------------------------------------------------
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/**
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*
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* @update gess10/30/98
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* @param
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* @return
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*/
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char* GetSharedEmptyBuffer() {
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static char* gCommonEmptyBuffer=0;
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if(!gCommonEmptyBuffer) {
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const size_t theDfltSize=25;
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gCommonEmptyBuffer=new char[theDfltSize];
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if(gCommonEmptyBuffer){
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nsCRT::zero(gCommonEmptyBuffer,theDfltSize);
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gCommonEmptyBuffer[0]=0;
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}
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else {
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printf("%s\n","Memory allocation error!");
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}
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}
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return gCommonEmptyBuffer;
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}
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/**
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*
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* @update gess10/30/98
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* @param
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* @return
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*/
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void nsStr::Initialize(nsStr& aDest,eCharSize aCharSize) {
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aDest.mStr=GetSharedEmptyBuffer();
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aDest.mLength=0;
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aDest.mCapacity=0;
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aDest.mMultibyte=aCharSize;
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aDest.mOwnsBuffer=0;
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NS_ASSERTION(aDest.mStr[0]==0,kFoolMsg);
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}
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/**
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*
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* @update gess10/30/98
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* @param
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* @return
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*/
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nsIMemoryAgent* GetDefaultAgent(void){
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static nsIMemoryAgent* gDefaultAgent=0;
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if(!gDefaultAgent)
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gDefaultAgent=new nsMemoryAgent();
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NS_ASSERTION(gDefaultAgent,"You MUST always have an allocator!");
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return gDefaultAgent;
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}
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/**
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*
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* @update gess10/30/98
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* @param
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* @return
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*/
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void nsStr::Destroy(nsStr& aDest,nsIMemoryAgent* anAgent) {
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if((aDest.mStr) && (aDest.mStr!=GetSharedEmptyBuffer())) {
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if(!anAgent)
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anAgent=GetDefaultAgent();
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if(anAgent) {
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anAgent->Free(aDest);
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}
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else{
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printf("%s\n","Leak occured in nsStr.");
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}
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}
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}
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/**
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*
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* @update gess11/12/98
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* @param
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* @return
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*/
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PRUnichar nsStr::GetCharAt(const nsStr& aDest,PRUint32 anIndex) {
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PRUnichar result=0;
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if((anIndex>=0) && (anIndex<aDest.mLength)) {
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result=(eTwoByte==aDest.mMultibyte) ? aDest.mUStr[anIndex] : aDest.mStr[anIndex];
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}//if
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return result;
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}
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/**
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* This method gets called when the internal buffer needs
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* to grow to a given size. The original contents are not preserved.
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* @update gess 3/30/98
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* @param aNewLength -- new capacity of string in charSize units
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* @return void
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*/
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void nsStr::EnsureCapacity(nsStr& aString,PRUint32 aNewLength,nsIMemoryAgent* anAgent) {
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if(aNewLength>aString.mCapacity) {
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nsIMemoryAgent* theAgent=(anAgent) ? anAgent : GetDefaultAgent();
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theAgent->Realloc(aString,aNewLength);
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AddNullTerminator(aString);
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}
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}
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/**
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* This method gets called when the internal buffer needs
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* to grow to a given size. The original contents ARE preserved.
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* @update gess 3/30/98
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* @param aNewLength -- new capacity of string in charSize units
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* @return void
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*/
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void nsStr::GrowCapacity(nsStr& aDest,PRUint32 aNewLength,nsIMemoryAgent* anAgent) {
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if(aNewLength>aDest.mCapacity) {
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nsStr theTempStr;
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nsStr::Initialize(theTempStr,(eCharSize)aDest.mMultibyte);
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nsIMemoryAgent* theAgent=(anAgent) ? anAgent : GetDefaultAgent();
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EnsureCapacity(theTempStr,aNewLength,theAgent);
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if(0<aDest.mLength) {
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Append(theTempStr,aDest,0,aDest.mLength,anAgent);
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}
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theAgent->Free(aDest);
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aDest.mStr = theTempStr.mStr;
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theTempStr.mStr=0; //make sure to null this out so that you don't lose the buffer you just stole...
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aDest.mLength=theTempStr.mLength;
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aDest.mCapacity=theTempStr.mCapacity;
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aDest.mOwnsBuffer=theTempStr.mOwnsBuffer;
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}
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}
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/**
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* Replaces the contents of aDest with aSource, up to aCount of chars.
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* @update gess10/30/98
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* @param aDest is the nsStr that gets changed.
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* @param aSource is where chars are copied from
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* @param aCount is the number of chars copied from aSource
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*/
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void nsStr::Assign(nsStr& aDest,const nsStr& aSource,PRUint32 anOffset,PRInt32 aCount,nsIMemoryAgent* anAgent){
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Truncate(aDest,0,anAgent);
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Append(aDest,aSource,anOffset,aCount,anAgent);
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}
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/**
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* This method appends the given nsStr to this one. Note that we have to
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* pay attention to the underlying char-size of both structs.
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* @update gess 04/04/99
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* @param aDest is the nsStr to be manipulated
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* @param aSource is where char are copied from
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* @aCount is the number of bytes to be copied
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*/
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void nsStr::Append(nsStr& aDest,const nsStr& aSource,PRUint32 anOffset,PRInt32 aCount,nsIMemoryAgent* anAgent){
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if(anOffset<aSource.mLength){
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PRUint32 theRealLen=(aCount<0) ? aSource.mLength : MinInt(aCount,aSource.mLength);
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PRUint32 theLength=(anOffset+theRealLen<aSource.mLength) ? theRealLen : (aSource.mLength-anOffset);
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if(0<theLength){
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if(aDest.mLength+theLength > aDest.mCapacity) {
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GrowCapacity(aDest,aDest.mLength+theLength,anAgent);
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}
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//now append new chars, starting at offset
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(*gCopyChars[aSource.mMultibyte][aDest.mMultibyte])(aDest.mStr,aDest.mLength,aSource.mStr,anOffset,theLength);
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aDest.mLength+=theLength;
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AddNullTerminator(aDest);
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}
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}
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}
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/**
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* This method inserts up to "aCount" chars from a source nsStr into a dest nsStr.
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* @update gess10/30/98
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* @param aDest is the nsStr that gets changed
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* @param aDestOffset is where in aDest the insertion is to occur
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* @param aSource is where chars are copied from
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* @param aSrcOffset is where in aSource chars are copied from
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* @param aCount is the number of chars from aSource to be inserted into aDest
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*/
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void nsStr::Insert( nsStr& aDest,PRUint32 aDestOffset,const nsStr& aSource,PRUint32 aSrcOffset,PRInt32 aCount,nsIMemoryAgent* anAgent){
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//there are a few cases for insert:
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// 1. You're inserting chars into an empty string (assign)
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// 2. You're inserting onto the end of a string (append)
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// 3. You're inserting onto the 1..n-1 pos of a string (the hard case).
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if((0<aSource.mLength) && (aDestOffset<aDest.mLength-1)){
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if(aDest.mLength){
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if(aDestOffset<aDest.mLength){
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if(aSrcOffset<aSource.mLength-1) {
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PRInt32 theRealLen=(aCount<0) ? aSource.mLength : MinInt(aCount,aSource.mLength);
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PRInt32 theLength=(aSrcOffset+theRealLen<aSource.mLength) ? theRealLen : (aSource.mLength-aSrcOffset);
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if(aSrcOffset<aSource.mLength) {
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//here's the only new case we have to handle.
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//chars are really being inserted into our buffer...
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GrowCapacity(aDest,aDest.mLength+theLength,anAgent);
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//shift the chars right by theDelta...
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(*gShiftChars[aDest.mMultibyte][PR_TRUE])(aDest.mStr,aDest.mLength,aDestOffset,theLength);
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//now insert new chars, starting at offset
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(*gCopyChars[aSource.mMultibyte][aDest.mMultibyte])(aDest.mStr,aDestOffset,aSource.mStr,aSrcOffset,theLength);
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//finally, make sure to update the string length...
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aDest.mLength+=theLength;
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}//if
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//else nothing to do!
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}
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}
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else Append(aDest,aSource,0,aCount,anAgent);
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}
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else Append(aDest,aSource,0,aCount,anAgent);
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}
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}
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/**
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* This method deletes up to aCount chars from aDest
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* @update gess10/30/98
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* @param aDest is the nsStr to be manipulated
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* @param aDestOffset is where in aDest deletion is to occur
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* @param aCount is the number of chars to be deleted in aDest
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*/
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void nsStr::Delete(nsStr& aDest,PRUint32 aDestOffset,PRInt32 aCount,nsIMemoryAgent* anAgent){
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if(0<aCount){
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if(aDestOffset<aDest.mLength){
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PRInt32 theDelta=aDest.mLength-aDestOffset;
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PRInt32 theLength=(theDelta<aCount) ? theDelta : aCount;
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if(aDestOffset+theLength<aDest.mLength) {
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//if you're here, it means we're cutting chars out of the middle of the string...
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//so shift the chars left by theLength...
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(*gShiftChars[aDest.mMultibyte][PR_FALSE])(aDest.mStr,aDest.mLength,aDestOffset,theLength);
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aDest.mLength-=theLength;
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}
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else Truncate(aDest,aDestOffset,anAgent);
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}//if
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}//if
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}
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/**
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* This method truncates the given nsStr at given offset
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* @update gess10/30/98
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* @param aDest is the nsStr to be truncated
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* @param aDestOffset is where in aDest truncation is to occur
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*/
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void nsStr::Truncate(nsStr& aDest,PRUint32 aDestOffset,nsIMemoryAgent* anAgent){
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if(aDestOffset<aDest.mLength){
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aDest.mLength=aDestOffset;
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AddNullTerminator(aDest);
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}
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}
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/**
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*
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* @update gess1/7/99
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* @param
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* @return
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*/
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void nsStr::ChangeCase(nsStr& aDest,PRBool aToUpper) {
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// somehow UnicharUtil return failed, fallback to the old ascii only code
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gCaseConverters[aDest.mMultibyte](aDest.mStr,aDest.mLength,aToUpper);
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}
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/**
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*
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* @update gess1/7/99
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* @param
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* @return
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*/
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void nsStr::StripChars(nsStr& aDest,PRUint32 aDestOffset,PRInt32 aCount,const char* aCharSet){
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PRUint32 aNewLen=gStripChars[aDest.mMultibyte](aDest.mStr,aDestOffset,aCount,aCharSet);
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aDest.mLength=aNewLen;
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}
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/**
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*
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* @update gess1/7/99
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* @param
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* @return
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*/
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void nsStr::Trim(nsStr& aDest,const char* aSet,PRBool aEliminateLeading,PRBool aEliminateTrailing){
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PRUint32 aNewLen=gTrimChars[aDest.mMultibyte](aDest.mStr,aDest.mLength,aSet,aEliminateLeading,aEliminateTrailing);
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aDest.mLength=aNewLen;
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}
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/**
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*
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* @update gess1/7/99
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* @param
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* @return
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*/
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void nsStr::CompressSet(nsStr& aDest,const char* aSet,PRUint32 aChar,PRBool aEliminateLeading,PRBool aEliminateTrailing){
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PRUint32 aNewLen=gCompressChars[aDest.mMultibyte](aDest.mStr,aDest.mLength,aSet,aChar,aEliminateLeading,aEliminateTrailing);
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aDest.mLength=aNewLen;
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}
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/**************************************************************
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Searching methods...
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**************************************************************/
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PRInt32 nsStr::FindSubstr(const nsStr& aDest,const nsStr& aTarget, PRBool /*aIgnoreCase*/,PRUint32 anOffset) {
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PRInt32 index=anOffset-1;
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PRInt32 theMax=aDest.mLength-aTarget.mLength;
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if((aDest.mLength>0) && (aTarget.mLength>0)){
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PRInt32 theNewStartPos=-1;
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PRUnichar theFirstTargetChar=nsStr::GetCharAt(aTarget,0);
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PRUnichar theLastTargetChar=nsStr::GetCharAt(aTarget,aTarget.mLength-1);
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PRInt32 theTargetMax=aTarget.mLength;
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while(++index<=theMax) {
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PRInt32 theSubIndex=-1;
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PRBool matches=PR_TRUE;
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while((++theSubIndex<theTargetMax) && (matches)){
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PRUnichar theChar=nsStr::GetCharAt(aDest,index+theSubIndex);
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if(theSubIndex>0) {
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if(theFirstTargetChar==theChar){
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PRUnichar theDestJumpChar=nsStr::GetCharAt(aDest,index+theTargetMax);
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if(theDestJumpChar==theLastTargetChar) {
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theNewStartPos=index; //this lets us jump ahead during our search where possible.
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}//if
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}//if
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}//if
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PRUnichar theTargetChar=nsStr::GetCharAt(aTarget,theSubIndex);
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matches=PRBool(theChar==theTargetChar);
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}
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if(matches)
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return index;
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if(-1<theNewStartPos){
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index=theNewStartPos-1;
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}
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}
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}//if
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return kNotFound;
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}
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/**
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*
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* @update gess1/7/99
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* @param
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* @return
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*/
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PRInt32 nsStr::FindChar(const nsStr& aDest, PRUnichar aChar, PRBool aIgnoreCase,PRUint32 anOffset) {
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PRInt32 result=gFindChars[aDest.mMultibyte](aDest.mStr,aDest.mLength,anOffset,aChar,aIgnoreCase);
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return result;
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}
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/**
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*
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*
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* @update gess 3/25/98
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* @param
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* @return
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*/
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PRInt32 nsStr::FindCharInSet(const nsStr& aDest,const nsStr& aSet,PRBool aIgnoreCase,PRUint32 anOffset) {
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PRUint32 index=anOffset-1;
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PRInt32 thePos;
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while(++index<aDest.mLength) {
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PRUnichar theChar=GetCharAt(aDest,index);
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thePos=gFindChars[aSet.mMultibyte](aSet.mStr,aSet.mLength,0,theChar,aIgnoreCase);
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if(kNotFound!=thePos)
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return index;
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} //while
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return kNotFound;
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}
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/**************************************************************
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Reverse Searching methods...
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**************************************************************/
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PRInt32 nsStr::RFindSubstr(const nsStr& aDest,const nsStr& aTarget, PRBool /*aIgnoreCase*/,PRUint32 anOffset) {
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PRInt32 index=(anOffset ? anOffset : aDest.mLength-aTarget.mLength+1);
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if((aDest.mLength>0) && (aTarget.mLength>0)){
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PRInt32 theNewStartPos=-1;
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PRUnichar theFirstTargetChar=nsStr::GetCharAt(aTarget,0);
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PRUnichar theLastTargetChar=nsStr::GetCharAt(aTarget,aTarget.mLength-1);
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PRInt32 theTargetMax=aTarget.mLength;
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while(index--) {
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PRInt32 theSubIndex=-1;
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PRBool matches=PR_TRUE;
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if(anOffset+aTarget.mLength<=aDest.mLength) {
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while((++theSubIndex<theTargetMax) && (matches)){
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PRUnichar theChar=nsStr::GetCharAt(aDest,index+theSubIndex);
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if(theSubIndex>0) {
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if(theFirstTargetChar==theChar){
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PRUnichar theDestJumpChar=nsStr::GetCharAt(aDest,index+theTargetMax);
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if(theDestJumpChar==theLastTargetChar) {
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theNewStartPos=index; //this lets us jump ahead during our search where possible.
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}//if
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}//if
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}//if
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PRUnichar theTargetChar=nsStr::GetCharAt(aTarget,theSubIndex);
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matches=PRBool(theChar==theTargetChar);
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} //while
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} //if
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if(matches)
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return index;
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if(-1<theNewStartPos){
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index=theNewStartPos-1;
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}
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}
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}//if
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return kNotFound;
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}
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/**
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*
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* @update gess1/7/99
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* @param
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* @return
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*/
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PRInt32 nsStr::RFindChar(const nsStr& aDest,PRUnichar aChar, PRBool aIgnoreCase,PRUint32 anOffset) {
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PRInt32 result=gRFindChars[aDest.mMultibyte](aDest.mStr,aDest.mLength,anOffset,aChar,aIgnoreCase);
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return result;
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}
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/**
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*
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*
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* @update gess 3/25/98
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* @param
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* @return
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*/
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PRInt32 nsStr::RFindCharInSet(const nsStr& aDest,const nsStr& aSet,PRBool aIgnoreCase,PRUint32 anOffset) {
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PRInt32 offset=aDest.mLength-anOffset;
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PRInt32 thePos;
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while(--offset>=0) {
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PRUnichar theChar=GetCharAt(aDest,PRUint32(offset));
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thePos=gRFindChars[aSet.mMultibyte](aSet.mStr,aSet.mLength,0,theChar,aIgnoreCase);
|
|
if(kNotFound!=thePos)
|
|
return offset;
|
|
} //while
|
|
return kNotFound;
|
|
}
|
|
|
|
|
|
/**
|
|
*
|
|
* @update gess11/12/98
|
|
* @param
|
|
* @return aDest<aSource=-1;aDest==aSource==0;aDest>aSource=1
|
|
*/
|
|
PRInt32 nsStr::Compare(const nsStr& aDest,const nsStr& aSource,PRInt32 /*aCount*/,PRBool aIgnoreCase) {
|
|
int minlen=(aSource.mLength<aDest.mLength) ? aSource.mLength : aDest.mLength;
|
|
|
|
if(0==minlen) {
|
|
if ((aDest.mLength == 0) && (aSource.mLength == 0))
|
|
return 0;
|
|
if (aDest.mLength == 0)
|
|
return -1;
|
|
return 1;
|
|
}
|
|
|
|
int maxlen=(aSource.mLength<aDest.mLength) ? aDest.mLength : aSource.mLength;
|
|
PRInt32 result=(*gCompare[aDest.mMultibyte][aSource.mMultibyte])(aDest.mStr,aSource.mStr,maxlen,aIgnoreCase);
|
|
return result;
|
|
}
|
|
|