зеркало из https://github.com/mozilla/pjs.git
368 строки
13 KiB
C++
368 строки
13 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/*
|
|
* The contents of this file are subject to the Netscape Public License
|
|
* Version 1.0 (the "NPL"); you may not use this file except in
|
|
* compliance with the NPL. You may obtain a copy of the NPL at
|
|
* http://www.mozilla.org/NPL/
|
|
*
|
|
* Software distributed under the NPL is distributed on an "AS IS" basis,
|
|
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
|
|
* for the specific language governing rights and limitations under the
|
|
* NPL.
|
|
*
|
|
* The Initial Developer of this code under the NPL is Netscape
|
|
* Communications Corporation. Portions created by Netscape are
|
|
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
|
|
* Reserved.
|
|
*/
|
|
|
|
|
|
/***********************************************************************
|
|
MODULE NOTES:
|
|
|
|
1. There are two philosophies to building string classes:
|
|
A. Hide the underlying buffer & offer API's allow indirect iteration
|
|
B. Reveal underlying buffer, risk corruption, but gain performance
|
|
|
|
We chose the option B for performance reasons.
|
|
|
|
2 Our internal buffer always holds capacity+1 bytes.
|
|
3. Note that our internal format for this class makes our memory
|
|
layout compatible with BStrings.
|
|
|
|
The nsStr struct is a simple structure (no methods) that contains
|
|
the necessary info to be described as a string. This simple struct
|
|
is manipulated by the static methods provided in this class.
|
|
(Which effectively makes this a library that works on structs).
|
|
|
|
There are also object-based versions called nsString and nsAutoString
|
|
which use nsStr but makes it look at feel like an object.
|
|
|
|
***********************************************************************/
|
|
|
|
|
|
#ifndef _nsStr
|
|
#define _nsStr
|
|
|
|
#include "prtypes.h"
|
|
#include "nscore.h"
|
|
|
|
//----------------------------------------------------------------------------------------
|
|
|
|
enum eCharSize {eOneByte=0,eTwoByte=1};
|
|
#define kDefaultCharSize eTwoByte
|
|
|
|
static const PRInt32 kNotFound = -1;
|
|
|
|
union UStrPtr {
|
|
char* mCharBuf;
|
|
PRUnichar* mUnicharBuf;
|
|
};
|
|
|
|
/**************************************************************************
|
|
Here comes the nsBufDescriptor class which describes buffer properties.
|
|
**************************************************************************/
|
|
|
|
struct nsBufDescriptor {
|
|
nsBufDescriptor(char* aBuffer,PRUint32 aBufferSize,eCharSize aCharSize,PRBool aOwnsBuffer) {
|
|
mStr=aBuffer;
|
|
mMultibyte=aCharSize;
|
|
mCapacity=(aBufferSize>>mMultibyte)-1;
|
|
mOwnsBuffer=aOwnsBuffer;
|
|
}
|
|
|
|
PRUint32 mCapacity;
|
|
PRBool mOwnsBuffer;
|
|
eCharSize mMultibyte;
|
|
// UStrPtr mStr;
|
|
union {
|
|
char* mStr;
|
|
PRUnichar* mUStr;
|
|
};
|
|
};
|
|
|
|
|
|
class nsIMemoryAgent;
|
|
|
|
//----------------------------------------------------------------------------------------
|
|
|
|
|
|
struct nsStr {
|
|
|
|
/**
|
|
* This method initializes an nsStr for use
|
|
*
|
|
* @update gess 01/04/99
|
|
* @param aString is the nsStr to be initialized
|
|
* @param aCharSize tells us the requested char size (1 or 2 bytes)
|
|
*/
|
|
static void Initialize(nsStr& aDest,eCharSize aCharSize);
|
|
|
|
/**
|
|
* This method destroys the given nsStr, and *MAY*
|
|
* deallocate it's memory depending on the setting
|
|
* of the internal mOwnsBUffer flag.
|
|
*
|
|
* @update gess 01/04/99
|
|
* @param aString is the nsStr to be manipulated
|
|
* @param anAgent is the allocator to be used to the nsStr
|
|
*/
|
|
static void Destroy(nsStr& aDest,nsIMemoryAgent* anAgent=0);
|
|
|
|
/**
|
|
* These methods are where memory allocation/reallocation occur.
|
|
*
|
|
* @update gess 01/04/99
|
|
* @param aString is the nsStr to be manipulated
|
|
* @param anAgent is the allocator to be used on the nsStr
|
|
* @return
|
|
*/
|
|
static void EnsureCapacity(nsStr& aString,PRUint32 aNewLength,nsIMemoryAgent* anAgent=0);
|
|
static void GrowCapacity(nsStr& aString,PRUint32 aNewLength,nsIMemoryAgent* anAgent=0);
|
|
|
|
/**
|
|
* These methods are used to append content to the given nsStr
|
|
*
|
|
* @update gess 01/04/99
|
|
* @param aDest is the nsStr to be appended to
|
|
* @param aSource is the buffer to be copied from
|
|
* @param anOffset tells us where in source to start copying
|
|
* @param aCount tells us the (max) # of chars to copy
|
|
* @param anAgent is the allocator to be used for alloc/free operations
|
|
*/
|
|
static void Append(nsStr& aDest,const nsStr& aSource,PRUint32 anOffset,PRInt32 aCount,nsIMemoryAgent* anAgent=0);
|
|
|
|
/**
|
|
* These methods are used to assign contents of a source string to dest string
|
|
*
|
|
* @update gess 01/04/99
|
|
* @param aDest is the nsStr to be appended to
|
|
* @param aSource is the buffer to be copied from
|
|
* @param anOffset tells us where in source to start copying
|
|
* @param aCount tells us the (max) # of chars to copy
|
|
* @param anAgent is the allocator to be used for alloc/free operations
|
|
*/
|
|
static void Assign(nsStr& aDest,const nsStr& aSource,PRUint32 anOffset,PRInt32 aCount,nsIMemoryAgent* anAgent=0);
|
|
|
|
/**
|
|
* These methods are used to insert content from source string to the dest nsStr
|
|
*
|
|
* @update gess 01/04/99
|
|
* @param aDest is the nsStr to be appended to
|
|
* @param aDestOffset tells us where in dest to start insertion
|
|
* @param aSource is the buffer to be copied from
|
|
* @param aSrcOffset tells us where in source to start copying
|
|
* @param aCount tells us the (max) # of chars to insert
|
|
* @param anAgent is the allocator to be used for alloc/free operations
|
|
*/
|
|
static void Insert( nsStr& aDest,PRUint32 aDestOffset,const nsStr& aSource,PRUint32 aSrcOffset,PRInt32 aCount,nsIMemoryAgent* anAgent=0);
|
|
|
|
/**
|
|
* This method deletes chars from the given str.
|
|
* The given allocator may choose to resize the str as well.
|
|
*
|
|
* @update gess 01/04/99
|
|
* @param aDest is the nsStr to be deleted from
|
|
* @param aDestOffset tells us where in dest to start deleting
|
|
* @param aCount tells us the (max) # of chars to delete
|
|
* @param anAgent is the allocator to be used for alloc/free operations
|
|
*/
|
|
static void Delete(nsStr& aDest,PRUint32 aDestOffset,PRInt32 aCount,nsIMemoryAgent* anAgent=0);
|
|
|
|
/**
|
|
* This method is used to truncate the given string.
|
|
* The given allocator may choose to resize the str as well (but it's not likely).
|
|
*
|
|
* @update gess 01/04/99
|
|
* @param aDest is the nsStr to be appended to
|
|
* @param aDestOffset tells us where in dest to start insertion
|
|
* @param aSource is the buffer to be copied from
|
|
* @param aSrcOffset tells us where in source to start copying
|
|
* @param anAgent is the allocator to be used for alloc/free operations
|
|
*/
|
|
static void Truncate(nsStr& aDest,PRUint32 aDestOffset,nsIMemoryAgent* anAgent=0);
|
|
|
|
/**
|
|
* This method is used to perform a case conversion on the given string
|
|
*
|
|
* @update gess 01/04/99
|
|
* @param aDest is the nsStr to be case shifted
|
|
* @param toUpper tells us to go upper vs. lower
|
|
*/
|
|
static void ChangeCase(nsStr& aDest,PRBool aToUpper);
|
|
|
|
/**
|
|
* This method removes chars (given in aSet) from the given buffer
|
|
*
|
|
* @update gess 01/04/99
|
|
* @param aString is the buffer to be manipulated
|
|
* @param aDestOffset is starting pos in buffer for manipulation
|
|
* @param aCount is the number of chars to compare
|
|
* @param aSet tells us which chars to remove from given buffer
|
|
*/
|
|
static void StripChars(nsStr& aDest,PRUint32 aDestOffset,PRInt32 aCount,const char* aCharSet);
|
|
|
|
/**
|
|
* This method trims chars (given in aSet) from the edges of given buffer
|
|
*
|
|
* @update gess 01/04/99
|
|
* @param aDest is the buffer to be manipulated
|
|
* @param aSet tells us which chars to remove from given buffer
|
|
* @param aEliminateLeading tells us whether to strip chars from the start of the buffer
|
|
* @param aEliminateTrailing tells us whether to strip chars from the start of the buffer
|
|
*/
|
|
static void Trim(nsStr& aDest,const char* aSet,PRBool aEliminateLeading,PRBool aEliminateTrailing);
|
|
|
|
/**
|
|
* This method compresses duplicate runs of a given char from the given buffer
|
|
*
|
|
* @update gess 01/04/99
|
|
* @param aDest is the buffer to be manipulated
|
|
* @param aSet tells us which chars to compress from given buffer
|
|
* @param aChar is the replacement char
|
|
* @param aEliminateLeading tells us whether to strip chars from the start of the buffer
|
|
* @param aEliminateTrailing tells us whether to strip chars from the start of the buffer
|
|
*/
|
|
static void CompressSet(nsStr& aDest,const char* aSet,PRUint32 aChar,PRBool aEliminateLeading,PRBool aEliminateTrailing);
|
|
|
|
/**
|
|
* This method compares the data bewteen two nsStr's
|
|
*
|
|
* @update gess 01/04/99
|
|
* @param aStr1 is the first buffer to be compared
|
|
* @param aStr2 is the 2nd buffer to be compared
|
|
* @param aCount is the number of chars to compare
|
|
* @param aIgnorecase tells us whether to use a case-sensitive comparison
|
|
* @return -1,0,1 depending on <,==,>
|
|
*/
|
|
static PRInt32 Compare(const nsStr& aDest,const nsStr& aSource,PRInt32 aCount,PRBool aIgnoreCase);
|
|
|
|
/**
|
|
* These methods scan the given string for 1 or more chars in a given direction
|
|
*
|
|
* @update gess 01/04/99
|
|
* @param aDest is the nsStr to be searched to
|
|
* @param aSource (or aChar) is the substr we're looking to find
|
|
* @param aIgnoreCase tells us whether to search in a case-sensitive manner
|
|
* @param anOffset tells us where in the dest string to start searching
|
|
* @return the index of the source (substr) in dest, or -1 (kNotFound) if not found.
|
|
*/
|
|
static PRInt32 FindSubstr(const nsStr& aDest,const nsStr& aSource, PRBool aIgnoreCase,PRUint32 anOffset);
|
|
static PRInt32 FindChar(const nsStr& aDest,PRUnichar aChar, PRBool aIgnoreCase,PRUint32 anOffset);
|
|
static PRInt32 FindCharInSet(const nsStr& aDest,const nsStr& aSet,PRBool aIgnoreCase,PRUint32 anOffset);
|
|
|
|
static PRInt32 RFindSubstr(const nsStr& aDest,const nsStr& aSource, PRBool aIgnoreCase,PRUint32 anOffset);
|
|
static PRInt32 RFindChar(const nsStr& aDest,PRUnichar aChar, PRBool aIgnoreCase,PRUint32 anOffset);
|
|
static PRInt32 RFindCharInSet(const nsStr& aDest,const nsStr& aSet,PRBool aIgnoreCase,PRUint32 anOffset);
|
|
|
|
/**
|
|
* This method is used to access a given char in the given string
|
|
*
|
|
* @update gess 01/04/99
|
|
* @param aDest is the nsStr to be appended to
|
|
* @param anIndex tells us where in dest to get the char from
|
|
* @return the given char, or 0 if anIndex is out of range
|
|
*/
|
|
static PRUnichar GetCharAt(const nsStr& aDest,PRUint32 anIndex);
|
|
|
|
PRUint32 mLength : 30;
|
|
eCharSize mMultibyte : 2;
|
|
PRUint32 mCapacity: 30;
|
|
PRUint32 mOwnsBuffer: 1;
|
|
PRUint32 mUnused: 1;
|
|
union {
|
|
char* mStr;
|
|
PRUnichar* mUStr;
|
|
};
|
|
};
|
|
|
|
/**************************************************************
|
|
A couple of tiny helper methods used in the string classes.
|
|
**************************************************************/
|
|
|
|
inline PRInt32 MinInt(PRInt32 anInt1,PRInt32 anInt2){
|
|
return (anInt1<anInt2) ? anInt1 : anInt2;
|
|
}
|
|
|
|
inline PRInt32 MaxInt(PRInt32 anInt1,PRInt32 anInt2){
|
|
return (anInt1<anInt2) ? anInt2 : anInt1;
|
|
}
|
|
|
|
inline void ToRange(PRInt32& aValue,PRInt32 aMin,PRInt32 aMax){
|
|
if(aValue<aMin)
|
|
aValue=aMin;
|
|
else if(aValue>aMax)
|
|
aValue=aMax;
|
|
}
|
|
|
|
inline void ToRange(PRUint32& aValue,PRUint32 aMin,PRUint32 aMax){
|
|
if(aValue<aMin)
|
|
aValue=aMin;
|
|
else if(aValue>aMax)
|
|
aValue=aMax;
|
|
}
|
|
|
|
inline void AddNullTerminator(nsStr& aDest) {
|
|
if(eTwoByte==aDest.mMultibyte)
|
|
aDest.mUStr[aDest.mLength]=0;
|
|
else aDest.mStr[aDest.mLength]=0;
|
|
}
|
|
|
|
//----------------------------------------------------------------------------------------
|
|
|
|
class nsIMemoryAgent {
|
|
public:
|
|
virtual PRBool Alloc(nsStr& aString,PRInt32 aCount)=0;
|
|
virtual PRBool Realloc(nsStr& aString,PRInt32 aCount)=0;
|
|
virtual PRBool Free(nsStr& aString)=0;
|
|
};
|
|
|
|
class nsMemoryAgent : public nsIMemoryAgent {
|
|
enum eDelta{eGrowthDelta=8};
|
|
public:
|
|
virtual PRBool Alloc(nsStr& aDest,PRInt32 aCount) {
|
|
|
|
//we're given the acount value in charunits; we have to scale up by the charsize.
|
|
|
|
PRInt32 theNewCapacity;
|
|
if (aDest.mCapacity > 64) {
|
|
// When the string starts getting large, double the capacity as we grow.
|
|
theNewCapacity = aDest.mCapacity * 2;
|
|
if (theNewCapacity < aCount) {
|
|
theNewCapacity = aDest.mCapacity + aCount;
|
|
}
|
|
} else {
|
|
// When the string is small, keep it's capacity a multiple of kGrowthDelta
|
|
PRInt32 unitDelta=(aCount/eGrowthDelta)+1;
|
|
theNewCapacity=unitDelta*eGrowthDelta;
|
|
}
|
|
|
|
aDest.mCapacity=theNewCapacity++;
|
|
size_t theSize=(theNewCapacity<<aDest.mMultibyte);
|
|
aDest.mStr=new char[theSize];
|
|
aDest.mOwnsBuffer=1;
|
|
return PR_TRUE;
|
|
}
|
|
|
|
virtual PRBool Free(nsStr& aDest){
|
|
if(aDest.mStr){
|
|
if(aDest.mOwnsBuffer){
|
|
delete [] aDest.mStr;
|
|
}
|
|
aDest.mStr=0;
|
|
aDest.mOwnsBuffer=0;
|
|
return PR_TRUE;
|
|
}
|
|
return PR_FALSE;
|
|
}
|
|
|
|
virtual PRBool Realloc(nsStr& aDest,PRInt32 aCount){
|
|
Free(aDest);
|
|
return Alloc(aDest,aCount);
|
|
}
|
|
|
|
};
|
|
|
|
#endif
|
|
|