зеркало из https://github.com/mozilla/gecko-dev.git
556 строки
14 KiB
C++
556 строки
14 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 1.1 (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/NPL/
|
||
*
|
||
* 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 Netscape are
|
||
* Copyright (C) 1998 Netscape Communications Corporation. All
|
||
* Rights Reserved.
|
||
*
|
||
* Contributor(s):
|
||
*/
|
||
|
||
#include "nsStringTokenizer.h"
|
||
|
||
|
||
nsStringTokenizer::nsStringTokenizer(const char* aFieldSep,const char* aRecordSep) :
|
||
mDataStartDelimiter(""),
|
||
mDataEndDelimiter(""),
|
||
mSubstrStartDelimiter(""),
|
||
mSubstrEndDelimiter(""),
|
||
mFieldSeparator(aFieldSep),
|
||
mRecordSeparator(aRecordSep)
|
||
{
|
||
mBuffer=0;
|
||
mOffset=0;
|
||
mValidChars[0]=mValidChars[1]=mValidChars[2]=mValidChars[3]=0;
|
||
mInvalidChars[0]=mInvalidChars[1]=mInvalidChars[2]=mInvalidChars[3]=0;
|
||
mCharSpec=eGivenChars;
|
||
}
|
||
|
||
nsStringTokenizer::~nsStringTokenizer(){
|
||
}
|
||
|
||
/**
|
||
* This method can tell you whether a given char is in the valid set
|
||
* given by the user in the constructor
|
||
* @update gess7/10/99
|
||
*/
|
||
void nsStringTokenizer::SetBuffer(nsString& aBuffer) {
|
||
mBuffer=&aBuffer;
|
||
}
|
||
|
||
/**
|
||
* Call this to add a token specifier to this tokenizer.
|
||
* Ultimately -- this method will be callable any number of times
|
||
* so that you can have multiple token types.
|
||
*
|
||
* @update gess7/10/99
|
||
*/
|
||
void nsStringTokenizer::AddTokenSpec(const char* aTokenSpec) {
|
||
if(aTokenSpec) {
|
||
ExpandDataSpecifier(aTokenSpec);
|
||
}
|
||
}
|
||
|
||
/**
|
||
* This method can tell you whether a given char is in the valid set
|
||
* given by the user in the constructor
|
||
* @update gess7/10/99
|
||
*/
|
||
inline PRBool nsStringTokenizer::IsValidDataChar(PRUnichar aChar) {
|
||
PRBool result=PR_FALSE;
|
||
switch(mCharSpec) {
|
||
case eGivenChars:
|
||
{
|
||
PRInt32 theByteNum=aChar/32;
|
||
PRInt32 theBitNum=aChar-(theByteNum*32);
|
||
PRInt32 shift=(1<<theBitNum);
|
||
PRInt32 value=PRInt32(mValidChars[theByteNum]&shift);
|
||
result=PRBool(value>0);
|
||
}
|
||
break;
|
||
case eAllChars:
|
||
result=PR_TRUE;
|
||
break;
|
||
case eExceptChars:
|
||
break;
|
||
}
|
||
return result;
|
||
}
|
||
|
||
inline void SetChars(PRInt32 array[3],PRUnichar aStart,PRUnichar aStop){
|
||
PRInt32 theChar;
|
||
for(theChar=aStart;theChar<=aStop;theChar++){
|
||
PRInt32 theByteNum=theChar/32;
|
||
PRInt32 theBitNum=theChar-(theByteNum*32);
|
||
PRInt32 shift=(1<<theBitNum);
|
||
array[theByteNum]|=shift;
|
||
}
|
||
}
|
||
|
||
inline void ClearChars(PRInt32 array[3],PRUnichar aStart,PRUnichar aStop){
|
||
PRInt32 theChar;
|
||
for(theChar=aStart;theChar<=aStop;theChar++){
|
||
PRInt32 theByteNum=theChar/32;
|
||
PRInt32 theBitNum=theChar-(theByteNum*32);
|
||
PRInt32 shift=(1<<theBitNum);
|
||
array[theByteNum]&=(~shift);
|
||
}
|
||
}
|
||
|
||
/**
|
||
* This method constructs the legal charset and data delimiter pairs.
|
||
* Specifier rules are:
|
||
* abc -- allows a set of characters
|
||
* [a-z] -- allows all chars in given range
|
||
* [*-*] -- allows all characters
|
||
* ^abc -- disallows a set of characters
|
||
* [a^z] -- disallows all characters in given range
|
||
* [a*b] -- specifies a delimiter pair for the entire token
|
||
* [a+b] -- specifies a delimiter pair for substrings in the token
|
||
* @update gess7/10/99
|
||
*/
|
||
void nsStringTokenizer::ExpandDataSpecifier(const char* aDataSpec) {
|
||
if(aDataSpec) {
|
||
PRInt32 theIndex=-1;
|
||
char theChar=0;
|
||
while(theChar=aDataSpec[++theIndex]) {
|
||
switch(theChar) {
|
||
case '[':
|
||
switch(aDataSpec[theIndex+2]){
|
||
case '-':
|
||
{
|
||
char theStart=aDataSpec[theIndex+1];
|
||
char theEnd=aDataSpec[theIndex+3];
|
||
if(('*'==theStart) && (theStart==theEnd)) {
|
||
mCharSpec=eAllChars;
|
||
}
|
||
else {
|
||
SetChars(mValidChars,theStart,theEnd);
|
||
}
|
||
}
|
||
break;
|
||
|
||
case '^': //specify a range of invalid chars
|
||
{
|
||
char theStart=aDataSpec[theIndex+1];
|
||
char theEnd=aDataSpec[theIndex+3];
|
||
SetChars(mInvalidChars,theStart,theEnd);
|
||
}
|
||
break;
|
||
|
||
case '*': //this char signals a delimiter pair
|
||
mDataStartDelimiter+=aDataSpec[theIndex+1];
|
||
mDataEndDelimiter+=aDataSpec[theIndex+3];
|
||
break;
|
||
|
||
case '+': //this char signals a delimiter pair for substrings
|
||
mSubstrStartDelimiter+=aDataSpec[theIndex+1];
|
||
mSubstrEndDelimiter+=aDataSpec[theIndex+3];
|
||
break;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
theIndex+=4;
|
||
break;
|
||
|
||
case '^'://they've given us a list (not a range) of invalid chars
|
||
{
|
||
while(theChar=aDataSpec[++theIndex]) {
|
||
if('['!=theChar) {
|
||
SetChars(mInvalidChars,theChar,theChar);
|
||
}
|
||
else {
|
||
--theIndex;
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
break;
|
||
default:
|
||
SetChars(mValidChars,theChar,theChar);
|
||
break;
|
||
}//switch
|
||
}
|
||
}
|
||
|
||
/* DEBUG CODE TO SHOW STRING OF GIVEN CHARSET
|
||
CAutoString temp;
|
||
for(PRInt32 theChar=0;theChar<128;theChar++){
|
||
if(IsValidDataChar(theChar))
|
||
temp+=theChar;
|
||
}
|
||
PRInt32 x=10;
|
||
*/
|
||
}
|
||
|
||
nsStringTokenizer::eCharTypes nsStringTokenizer::DetermineCharType(PRUnichar ch) {
|
||
eCharTypes result=eUnknown;
|
||
|
||
if(mRecordSeparator[0]==ch)
|
||
result=eRecordSeparator;
|
||
else if(mFieldSeparator[0]==ch)
|
||
result=eFieldSeparator;
|
||
else if((mDataStartDelimiter[0]==ch) || (mDataEndDelimiter[0]==ch))
|
||
result=eDataDelimiter;
|
||
else if(IsValidDataChar(ch))
|
||
result=eDataChar;
|
||
return result;
|
||
}
|
||
|
||
|
||
/**
|
||
* Moves the input stream to the start of the file.
|
||
* @update gess7/25/98
|
||
* @return yes if all is well
|
||
*/
|
||
PRBool nsStringTokenizer::FirstRecord(void){
|
||
mOffset=0;
|
||
return PRBool(mBuffer!=0);
|
||
}
|
||
|
||
|
||
|
||
/**
|
||
* Seeks to next record
|
||
* @update gess7/25/98
|
||
* @return PR_TRUE if there IS a next record
|
||
*/
|
||
PRBool nsStringTokenizer::NextRecord(void){
|
||
PRBool result=PR_FALSE;
|
||
|
||
if(mBuffer) {
|
||
PRInt32 status=SkipOver(mRecordSeparator);
|
||
if(NS_OK==status) {
|
||
if(SkipToValidData()) {
|
||
if(NS_OK==status) {
|
||
result=HasNextToken();
|
||
}
|
||
}
|
||
else result=PR_FALSE;
|
||
}
|
||
}
|
||
return result;
|
||
}
|
||
|
||
|
||
/*
|
||
* LAST MODS: gess 12Aug94
|
||
* PARMS: <09><>
|
||
* RETURNS: YES if there is another field to be read.
|
||
* PURPOSE: Allows a client to ask the io system to test for
|
||
the presence of another field.
|
||
*/
|
||
PRBool nsStringTokenizer::HasNextToken(void){
|
||
PRBool result=PR_FALSE;
|
||
|
||
if(mBuffer){
|
||
while(More()) {
|
||
//Now go test to see if there is any other field data in this record.
|
||
//The appropriate algorithm here is to scan the file until you
|
||
//find one of following things occurs:
|
||
// 1. You find a field separator
|
||
// 2. You find a record separator
|
||
// 3. You hit the end of the file
|
||
// 4. You find a valid char.
|
||
PRUnichar theChar;
|
||
GetChar(theChar);
|
||
switch(DetermineCharType(theChar)){
|
||
|
||
case eUnknown: //ok to skip junk between delimiters...
|
||
if(-1<mSubstrStartDelimiter.Find(theChar)) {
|
||
break;
|
||
}
|
||
|
||
case eDataChar:
|
||
if(kSpace<theChar) {
|
||
UnGetChar(theChar);
|
||
return PR_TRUE;
|
||
}
|
||
break;
|
||
|
||
case eDataDelimiter:
|
||
UnGetChar(theChar);
|
||
return PR_TRUE;
|
||
|
||
case eFieldSeparator:
|
||
SkipOver(mFieldSeparator[0]);
|
||
return PR_TRUE;
|
||
|
||
case eRecordSeparator:
|
||
UnGetChar(theChar);
|
||
return PR_FALSE;
|
||
|
||
default:
|
||
return PR_FALSE;
|
||
}
|
||
}
|
||
}//if
|
||
return result;
|
||
}
|
||
|
||
|
||
/**
|
||
* LAST MODS: gess 4Jul94
|
||
* PARMS:
|
||
* RETURNS: error code; 0 means all is well.
|
||
* PURPOSE: Gets the next field of data from the stream.
|
||
* NOTES: This does not currently handle fields that have
|
||
field delimiters (ie quotes).
|
||
|
||
* WARNING: You should have called HasNextToken prior
|
||
to calling this method, so that you can
|
||
fail gracefully if you encounter the end
|
||
of your input stream (unexpectedly). If
|
||
this method hits EOF, it returns an error.
|
||
*/
|
||
PRInt32 nsStringTokenizer::GetNextToken(nsString& aToken){
|
||
PRInt32 result=0;
|
||
|
||
if(mBuffer && More()) {
|
||
PRUnichar theChar;
|
||
if(mDataStartDelimiter.Length()) {
|
||
result=GetChar(theChar); //skip delimiter...
|
||
if(mFieldSeparator[0]==theChar)
|
||
return result;
|
||
aToken+=theChar;
|
||
}
|
||
if(NS_OK==result) {
|
||
PRUnichar theTerm[]={mFieldSeparator[0],mRecordSeparator[0],0,0};
|
||
if(mDataEndDelimiter.Length()) {
|
||
theTerm[2]=mDataEndDelimiter[0];
|
||
}
|
||
nsAutoString terms(mRecordSeparator);
|
||
terms+=mFieldSeparator;
|
||
result=ReadUntil(aToken,terms,PRBool(0!=mDataEndDelimiter[0]));
|
||
if(NS_OK==result) {
|
||
PRInt32 status=SkipOver(mFieldSeparator[0]);
|
||
}
|
||
}
|
||
}
|
||
return result;
|
||
}
|
||
|
||
|
||
|
||
/*
|
||
* This method gets called when the system wants to jump over any garbage before that may be in a
|
||
* string. Typically, this happens before, inbetween and after valid data rows.
|
||
*
|
||
* LAST MODS: gess 11Aug94
|
||
* RETURNS: 0 if all is well; non-zero for error. If you hit EOF, return 0.
|
||
*/
|
||
PRBool nsStringTokenizer::SkipToValidData(void){
|
||
PRInt32 result=0;
|
||
PRUnichar ch;
|
||
|
||
if(mBuffer) {
|
||
while(More()) {
|
||
result=GetChar(ch);
|
||
|
||
switch(DetermineCharType(ch)){
|
||
case eDataChar:
|
||
if(!mDataStartDelimiter[0]) {
|
||
UnGetChar(ch);
|
||
return PR_TRUE;
|
||
}
|
||
break;
|
||
|
||
case eDataDelimiter:
|
||
if(ch==mDataStartDelimiter[0]) {
|
||
UnGetChar(ch);
|
||
return PR_TRUE;
|
||
}
|
||
break;
|
||
|
||
case eFieldSeparator:
|
||
case eRecordSeparator:
|
||
UnGetChar(ch);
|
||
return PR_TRUE;
|
||
|
||
default:
|
||
break;
|
||
} //switch
|
||
} //while
|
||
}//if
|
||
return PR_FALSE;
|
||
}
|
||
|
||
PRInt32 nsStringTokenizer::SkipOver(PRUnichar aSkipChar) {
|
||
PRUnichar theChar=0;
|
||
PRInt32 result=NS_OK;
|
||
|
||
if(mBuffer) {
|
||
while(NS_OK==result) {
|
||
result=GetChar(theChar);
|
||
if(NS_OK == result) {
|
||
if(theChar!=aSkipChar) {
|
||
UnGetChar(theChar);
|
||
break;
|
||
}
|
||
}
|
||
else break;
|
||
} //while
|
||
}//if
|
||
return result;
|
||
}
|
||
|
||
PRInt32 nsStringTokenizer::SkipOver(nsString& aString) {
|
||
PRUnichar theChar=0;
|
||
PRInt32 result=NS_OK;
|
||
|
||
if(mBuffer) {
|
||
while(NS_OK==result) {
|
||
result=GetChar(theChar);
|
||
if(NS_OK == result) {
|
||
|
||
PRInt32 index=aString.Find(theChar);
|
||
if(-1==index) {
|
||
UnGetChar(theChar);
|
||
break;
|
||
}
|
||
}
|
||
else break;
|
||
} //while
|
||
} //if
|
||
return result;
|
||
}
|
||
|
||
PRInt32 nsStringTokenizer::ReadUntil(nsString& aString,nsString& aTermSet,PRBool addTerminal){
|
||
PRInt32 result=NS_OK;
|
||
|
||
PRUnichar theChar=0;
|
||
PRBool theCharIsValid;
|
||
|
||
if(mBuffer) {
|
||
while(NS_OK == result) {
|
||
result=GetChar(theChar);
|
||
if(NS_OK==result) {
|
||
|
||
PRBool found=PR_FALSE;
|
||
PRInt32 index=aTermSet.Find(theChar);
|
||
if(kNotFound<index)
|
||
found=PR_TRUE;
|
||
|
||
if(found) {
|
||
if(addTerminal)
|
||
aString+=theChar;
|
||
else UnGetChar(theChar);
|
||
break;
|
||
}
|
||
else {
|
||
PRInt32 pos=mSubstrStartDelimiter.Find(theChar);
|
||
if(-1<pos) {
|
||
aString+=theChar;
|
||
result=ReadUntil(aString,mSubstrEndDelimiter[pos],PR_TRUE);
|
||
}
|
||
else if(theCharIsValid){
|
||
if(IsValidDataChar(theChar)){
|
||
aString+=theChar;
|
||
}
|
||
else theCharIsValid=PR_FALSE;
|
||
}
|
||
} //else
|
||
} //if
|
||
} //while
|
||
}//if
|
||
|
||
return result;
|
||
}
|
||
|
||
PRInt32 nsStringTokenizer::ReadUntil(nsString& aString,PRUnichar aTerminalChar,PRBool addTerminal){
|
||
PRInt32 result=NS_OK;
|
||
|
||
PRUnichar theChar=0;
|
||
if(mBuffer) {
|
||
while(NS_OK == result) {
|
||
result=GetChar(theChar);
|
||
if(NS_OK==result) {
|
||
|
||
if(theChar==aTerminalChar){
|
||
if(addTerminal)
|
||
aString+=theChar;
|
||
else UnGetChar(theChar);
|
||
break;
|
||
}
|
||
else aString+=theChar;
|
||
}//if
|
||
} //while
|
||
}//if
|
||
|
||
return result;
|
||
}
|
||
|
||
PRBool nsStringTokenizer::More(void){
|
||
PRBool result=PR_FALSE;
|
||
if(mBuffer) {
|
||
if(mOffset<mBuffer->Length())
|
||
result=PR_TRUE;
|
||
}
|
||
return result;
|
||
}
|
||
|
||
PRInt32 nsStringTokenizer::GetChar(PRUnichar& aChar){
|
||
PRInt32 result=kEOF;
|
||
if(mBuffer) {
|
||
if(mOffset<mBuffer->Length()) {
|
||
aChar=(*mBuffer)[mOffset++];
|
||
result=0;
|
||
}
|
||
}
|
||
return result;
|
||
}
|
||
|
||
void nsStringTokenizer::UnGetChar(PRUnichar aChar){
|
||
if(mOffset>0)
|
||
mOffset--;
|
||
}
|
||
|
||
|
||
/*
|
||
* Call this method if you want the tokenizer to iterate your string
|
||
* and automatically call you back with each token
|
||
*
|
||
* @parm aFunctor is the object you want me to notify
|
||
* @update gess 07/10/99
|
||
* RETURNS: 0 if all went well
|
||
*/
|
||
PRInt32 nsStringTokenizer::Iterate(nsString& aBuffer,ITokenizeFunctor& aFunctor) {
|
||
PRInt32 result=0;
|
||
PRInt32 theRecordNum=-1;
|
||
|
||
nsString* theOldBuffer=mBuffer;
|
||
mBuffer=&aBuffer;
|
||
FirstRecord();
|
||
while(HasNextToken()){
|
||
theRecordNum++;
|
||
PRInt32 theTokenNum=-1;
|
||
while(HasNextToken()){
|
||
theTokenNum++;
|
||
nsAutoString theString;
|
||
GetNextToken(theString);
|
||
aFunctor(theString,theRecordNum,theTokenNum);
|
||
}
|
||
NextRecord();
|
||
}
|
||
mBuffer=theOldBuffer;
|
||
return result;
|
||
}
|
||
|
||
|
||
|
||
|
||
|