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gecko-dev/xpcom/string/nsTStringObsolete.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsTArray.h"
#include "mozilla/CheckedInt.h"
/**
* nsTString::Find
*
* aOffset specifies starting index
* aCount specifies number of string compares (iterations)
*/
int32_t
nsTString_CharT::Find( const nsCString& aString, bool aIgnoreCase, int32_t aOffset, int32_t aCount) const
{
// this method changes the meaning of aOffset and aCount:
Find_ComputeSearchRange(mLength, aString.Length(), aOffset, aCount);
int32_t result = FindSubstring(mData + aOffset, aCount, aString.get(), aString.Length(), aIgnoreCase);
if (result != kNotFound)
result += aOffset;
return result;
}
int32_t
nsTString_CharT::Find( const char* aString, bool aIgnoreCase, int32_t aOffset, int32_t aCount) const
{
return Find(nsDependentCString(aString), aIgnoreCase, aOffset, aCount);
}
/**
* nsTString::RFind
*
* aOffset specifies starting index
* aCount specifies number of string compares (iterations)
*/
int32_t
nsTString_CharT::RFind( const nsCString& aString, bool aIgnoreCase, int32_t aOffset, int32_t aCount) const
{
// this method changes the meaning of aOffset and aCount:
RFind_ComputeSearchRange(mLength, aString.Length(), aOffset, aCount);
int32_t result = RFindSubstring(mData + aOffset, aCount, aString.get(), aString.Length(), aIgnoreCase);
if (result != kNotFound)
result += aOffset;
return result;
}
int32_t
nsTString_CharT::RFind( const char* aString, bool aIgnoreCase, int32_t aOffset, int32_t aCount) const
{
return RFind(nsDependentCString(aString), aIgnoreCase, aOffset, aCount);
}
/**
* nsTString::RFindChar
*/
int32_t
nsTString_CharT::RFindChar( char16_t aChar, int32_t aOffset, int32_t aCount) const
{
return nsBufferRoutines<CharT>::rfind_char(mData, mLength, aOffset, aChar, aCount);
}
/**
* nsTString::FindCharInSet
*/
int32_t
nsTString_CharT::FindCharInSet( const char* aSet, int32_t aOffset ) const
{
if (aOffset < 0)
aOffset = 0;
else if (aOffset >= int32_t(mLength))
return kNotFound;
int32_t result = ::FindCharInSet(mData + aOffset, mLength - aOffset, aSet);
if (result != kNotFound)
result += aOffset;
return result;
}
/**
* nsTString::RFindCharInSet
*/
int32_t
nsTString_CharT::RFindCharInSet( const CharT* aSet, int32_t aOffset ) const
{
// We want to pass a "data length" to ::RFindCharInSet
if (aOffset < 0 || aOffset > int32_t(mLength))
aOffset = mLength;
else
++aOffset;
return ::RFindCharInSet(mData, aOffset, aSet);
}
// it's a shame to replicate this code. it was done this way in the past
// to help performance. this function also gets to keep the rickg style
// indentation :-/
int32_t
nsTString_CharT::ToInteger( nsresult* aErrorCode, uint32_t aRadix ) const
{
CharT* cp=mData;
int32_t theRadix=10; // base 10 unless base 16 detected, or overriden (aRadix != kAutoDetect)
int32_t result=0;
bool negate=false;
CharT theChar=0;
//initial value, override if we find an integer
*aErrorCode=NS_ERROR_ILLEGAL_VALUE;
if(cp) {
//begin by skipping over leading chars that shouldn't be part of the number...
CharT* endcp=cp+mLength;
bool done=false;
while((cp<endcp) && (!done)){
switch(*cp++) {
case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
theRadix=16;
done=true;
break;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
done=true;
break;
case '-':
negate=true; //fall through...
break;
case 'X': case 'x':
theRadix=16;
break;
default:
break;
} //switch
}
if (done) {
//integer found
*aErrorCode = NS_OK;
if (aRadix!=kAutoDetect) theRadix = aRadix; // override
//now iterate the numeric chars and build our result
CharT* first=--cp; //in case we have to back up.
bool haveValue = false;
while(cp<endcp){
int32_t oldresult = result;
theChar=*cp++;
if(('0'<=theChar) && (theChar<='9')){
result = (theRadix * result) + (theChar-'0');
haveValue = true;
}
else if((theChar>='A') && (theChar<='F')) {
if(10==theRadix) {
if(kAutoDetect==aRadix){
theRadix=16;
cp=first; //backup
result=0;
haveValue = false;
}
else {
*aErrorCode=NS_ERROR_ILLEGAL_VALUE;
result=0;
break;
}
}
else {
result = (theRadix * result) + ((theChar-'A')+10);
haveValue = true;
}
}
else if((theChar>='a') && (theChar<='f')) {
if(10==theRadix) {
if(kAutoDetect==aRadix){
theRadix=16;
cp=first; //backup
result=0;
haveValue = false;
}
else {
*aErrorCode=NS_ERROR_ILLEGAL_VALUE;
result=0;
break;
}
}
else {
result = (theRadix * result) + ((theChar-'a')+10);
haveValue = true;
}
}
else if((('X'==theChar) || ('x'==theChar)) && (!haveValue || result == 0)) {
continue;
}
else if((('#'==theChar) || ('+'==theChar)) && !haveValue) {
continue;
}
else {
//we've encountered a char that's not a legal number or sign
break;
}
if (result < oldresult) {
// overflow!
*aErrorCode = NS_ERROR_ILLEGAL_VALUE;
result = 0;
break;
}
} //while
if(negate)
result=-result;
} //if
}
return result;
}
/**
* nsTString::ToInteger64
*/
int64_t
nsTString_CharT::ToInteger64( nsresult* aErrorCode, uint32_t aRadix ) const
{
CharT* cp=mData;
int32_t theRadix=10; // base 10 unless base 16 detected, or overriden (aRadix != kAutoDetect)
int64_t result=0;
bool negate=false;
CharT theChar=0;
//initial value, override if we find an integer
*aErrorCode=NS_ERROR_ILLEGAL_VALUE;
if(cp) {
//begin by skipping over leading chars that shouldn't be part of the number...
CharT* endcp=cp+mLength;
bool done=false;
while((cp<endcp) && (!done)){
switch(*cp++) {
case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
theRadix=16;
done=true;
break;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
done=true;
break;
case '-':
negate=true; //fall through...
break;
case 'X': case 'x':
theRadix=16;
break;
default:
break;
} //switch
}
if (done) {
//integer found
*aErrorCode = NS_OK;
if (aRadix!=kAutoDetect) theRadix = aRadix; // override
//now iterate the numeric chars and build our result
CharT* first=--cp; //in case we have to back up.
bool haveValue = false;
while(cp<endcp){
int64_t oldresult = result;
theChar=*cp++;
if(('0'<=theChar) && (theChar<='9')){
result = (theRadix * result) + (theChar-'0');
haveValue = true;
}
else if((theChar>='A') && (theChar<='F')) {
if(10==theRadix) {
if(kAutoDetect==aRadix){
theRadix=16;
cp=first; //backup
result=0;
haveValue = false;
}
else {
*aErrorCode=NS_ERROR_ILLEGAL_VALUE;
result=0;
break;
}
}
else {
result = (theRadix * result) + ((theChar-'A')+10);
haveValue = true;
}
}
else if((theChar>='a') && (theChar<='f')) {
if(10==theRadix) {
if(kAutoDetect==aRadix){
theRadix=16;
cp=first; //backup
result=0;
haveValue = false;
}
else {
*aErrorCode=NS_ERROR_ILLEGAL_VALUE;
result=0;
break;
}
}
else {
result = (theRadix * result) + ((theChar-'a')+10);
haveValue = true;
}
}
else if((('X'==theChar) || ('x'==theChar)) && (!haveValue || result == 0)) {
continue;
}
else if((('#'==theChar) || ('+'==theChar)) && !haveValue) {
continue;
}
else {
//we've encountered a char that's not a legal number or sign
break;
}
if (result < oldresult) {
// overflow!
*aErrorCode = NS_ERROR_ILLEGAL_VALUE;
result = 0;
break;
}
} //while
if(negate)
result=-result;
} //if
}
return result;
}
/**
* nsTString::Mid
*/
uint32_t
nsTString_CharT::Mid( self_type& aResult, index_type aStartPos, size_type aLengthToCopy ) const
{
if (aStartPos == 0 && aLengthToCopy >= mLength)
aResult = *this;
else
aResult = Substring(*this, aStartPos, aLengthToCopy);
return aResult.mLength;
}
/**
* nsTString::SetCharAt
*/
bool
nsTString_CharT::SetCharAt( char16_t aChar, uint32_t aIndex )
{
if (aIndex >= mLength)
return false;
if (!EnsureMutable())
AllocFailed(mLength);
mData[aIndex] = CharT(aChar);
return true;
}
/**
* nsTString::StripChars,StripChar,StripWhitespace
*/
void
nsTString_CharT::StripChars( const char* aSet )
{
if (!EnsureMutable())
AllocFailed(mLength);
mLength = nsBufferRoutines<CharT>::strip_chars(mData, mLength, aSet);
}
bool
nsTString_CharT::StripChars( const char* aSet, const fallible_t& )
{
if (!EnsureMutable()) {
return false;
}
mLength = nsBufferRoutines<CharT>::strip_chars(mData, mLength, aSet);
return true;
}
void
nsTString_CharT::StripWhitespace()
{
StripChars(kWhitespace);
}
bool
nsTString_CharT::StripWhitespace(const fallible_t& aFallible)
{
return StripChars(kWhitespace, aFallible);
}
/**
* nsTString::ReplaceChar,ReplaceSubstring
*/
void
nsTString_CharT::ReplaceChar( char_type aOldChar, char_type aNewChar )
{
if (!EnsureMutable()) // XXX do this lazily?
AllocFailed(mLength);
for (uint32_t i=0; i<mLength; ++i)
{
if (mData[i] == aOldChar)
mData[i] = aNewChar;
}
}
void
nsTString_CharT::ReplaceChar( const char* aSet, char_type aNewChar )
{
if (!EnsureMutable()) // XXX do this lazily?
AllocFailed(mLength);
char_type* data = mData;
uint32_t lenRemaining = mLength;
while (lenRemaining)
{
int32_t i = ::FindCharInSet(data, lenRemaining, aSet);
if (i == kNotFound)
break;
data[i++] = aNewChar;
data += i;
lenRemaining -= i;
}
}
void ReleaseData(void* aData, uint32_t aFlags);
void
nsTString_CharT::ReplaceSubstring(const char_type* aTarget,
const char_type* aNewValue)
{
ReplaceSubstring(nsTDependentString_CharT(aTarget),
nsTDependentString_CharT(aNewValue));
}
bool
nsTString_CharT::ReplaceSubstring(const char_type* aTarget,
const char_type* aNewValue,
const fallible_t& aFallible)
{
return ReplaceSubstring(nsTDependentString_CharT(aTarget),
nsTDependentString_CharT(aNewValue),
aFallible);
}
void
nsTString_CharT::ReplaceSubstring(const self_type& aTarget,
const self_type& aNewValue)
{
if (!ReplaceSubstring(aTarget, aNewValue, mozilla::fallible)) {
// Note that this may wildly underestimate the allocation that failed, as
// we could have been replacing multiple copies of aTarget.
AllocFailed(mLength + (aNewValue.Length() - aTarget.Length()));
}
}
bool
nsTString_CharT::ReplaceSubstring(const self_type& aTarget,
const self_type& aNewValue,
const fallible_t&)
{
if (aTarget.Length() == 0)
return true;
// Remember all of the non-matching parts.
AutoTArray<Segment, 16> nonMatching;
uint32_t i = 0;
mozilla::CheckedUint32 newLength;
while (true)
{
int32_t r = FindSubstring(mData + i, mLength - i, static_cast<const char_type*>(aTarget.Data()), aTarget.Length(), false);
int32_t until = (r == kNotFound) ? mLength - i : r;
nonMatching.AppendElement(Segment(i, until));
newLength += until;
if (r == kNotFound) {
break;
}
newLength += aNewValue.Length();
i += r + aTarget.Length();
if (i >= mLength) {
// Add an auxiliary entry at the end of the list to help as an edge case
// for the algorithms below.
nonMatching.AppendElement(Segment(mLength, 0));
break;
}
}
if (!newLength.isValid()) {
return false;
}
// If there's only one non-matching segment, then the target string was not
// found, and there's nothing to do.
if (nonMatching.Length() == 1) {
MOZ_ASSERT(nonMatching[0].mBegin == 0 && nonMatching[0].mLength == mLength,
"We should have the correct non-matching segment.");
return true;
}
// Make sure that we can mutate our buffer.
// Note that we always allocate at least an mLength sized buffer, because the
// rest of the algorithm relies on having access to all of the original
// string. In other words, we over-allocate in the shrinking case.
char_type* oldData;
uint32_t oldFlags;
if (!MutatePrep(XPCOM_MAX(mLength, newLength.value()), &oldData, &oldFlags))
return false;
if (oldData) {
// Copy all of the old data to the new buffer.
char_traits::copy(mData, oldData, mLength);
::ReleaseData(oldData, oldFlags);
}
if (aTarget.Length() >= aNewValue.Length()) {
// In the shrinking case, start filling the buffer from the beginning.
const uint32_t delta = (aTarget.Length() - aNewValue.Length());
for (i = 1; i < nonMatching.Length(); ++i) {
// When we move the i'th non-matching segment into position, we need to
// account for the characters deleted by the previous |i| replacements by
// subtracting |i * delta|.
const char_type* sourceSegmentPtr = mData + nonMatching[i].mBegin;
char_type* destinationSegmentPtr = mData + nonMatching[i].mBegin - i * delta;
// Write the i'th replacement immediately before the new i'th non-matching
// segment.
char_traits::copy(destinationSegmentPtr - aNewValue.Length(),
aNewValue.Data(), aNewValue.Length());
char_traits::move(destinationSegmentPtr, sourceSegmentPtr,
nonMatching[i].mLength);
}
} else {
// In the growing case, start filling the buffer from the end.
const uint32_t delta = (aNewValue.Length() - aTarget.Length());
for (i = nonMatching.Length() - 1; i > 0; --i) {
// When we move the i'th non-matching segment into position, we need to
// account for the characters added by the previous |i| replacements by
// adding |i * delta|.
const char_type* sourceSegmentPtr = mData + nonMatching[i].mBegin;
char_type* destinationSegmentPtr = mData + nonMatching[i].mBegin + i * delta;
char_traits::move(destinationSegmentPtr, sourceSegmentPtr,
nonMatching[i].mLength);
// Write the i'th replacement immediately before the new i'th non-matching
// segment.
char_traits::copy(destinationSegmentPtr - aNewValue.Length(),
aNewValue.Data(), aNewValue.Length());
}
}
// Adjust the length and make sure the string is null terminated.
mLength = newLength.value();
mData[mLength] = char_type(0);
return true;
}
/**
* nsTString::Trim
*/
void
nsTString_CharT::Trim( const char* aSet, bool aTrimLeading, bool aTrimTrailing, bool aIgnoreQuotes )
{
// the old implementation worried about aSet being null :-/
if (!aSet)
return;
char_type* start = mData;
char_type* end = mData + mLength;
// skip over quotes if requested
if (aIgnoreQuotes && mLength > 2 && mData[0] == mData[mLength - 1] &&
(mData[0] == '\'' || mData[0] == '"'))
{
++start;
--end;
}
uint32_t setLen = nsCharTraits<char>::length(aSet);
if (aTrimLeading)
{
uint32_t cutStart = start - mData;
uint32_t cutLength = 0;
// walk forward from start to end
for (; start != end; ++start, ++cutLength)
{
int32_t pos = FindChar1(aSet, setLen, 0, *start, setLen);
if (pos == kNotFound)
break;
}
if (cutLength)
{
Cut(cutStart, cutLength);
// reset iterators
start = mData + cutStart;
end = mData + mLength - cutStart;
}
}
if (aTrimTrailing)
{
uint32_t cutEnd = end - mData;
uint32_t cutLength = 0;
// walk backward from end to start
--end;
for (; end >= start; --end, ++cutLength)
{
int32_t pos = FindChar1(aSet, setLen, 0, *end, setLen);
if (pos == kNotFound)
break;
}
if (cutLength)
Cut(cutEnd - cutLength, cutLength);
}
}
/**
* nsTString::CompressWhitespace
*/
void
nsTString_CharT::CompressWhitespace( bool aTrimLeading, bool aTrimTrailing )
{
const char* set = kWhitespace;
ReplaceChar(set, ' ');
Trim(set, aTrimLeading, aTrimTrailing);
// this one does some questionable fu... just copying the old code!
mLength = nsBufferRoutines<char_type>::compress_chars(mData, mLength, set);
}
/**
* nsTString::AssignWithConversion
*/
void
nsTString_CharT::AssignWithConversion( const incompatible_char_type* aData, int32_t aLength )
{
// for compatibility with the old string implementation, we need to allow
// for a nullptr input buffer :-(
if (!aData)
{
Truncate();
}
else
{
if (aLength < 0)
aLength = nsCharTraits<incompatible_char_type>::length(aData);
AssignWithConversion(Substring(aData, aLength));
}
}
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