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scuffed-code/icu4c/source/common/unistr.cpp
George Rhoten 068f60d1a0 ICU-1028 Fix for os/390 
X-SVN-Rev: 6442
2001-10-25 21:55:45 +00:00

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/*
******************************************************************************
* Copyright (C) 1999-2001, International Business Machines Corporation and *
* others. All Rights Reserved. *
******************************************************************************
*
* File unistr.cpp
*
* Modification History:
*
* Date Name Description
* 09/25/98 stephen Creation.
* 04/20/99 stephen Overhauled per 4/16 code review.
* 07/09/99 stephen Renamed {hi,lo},{byte,word} to icu_X for HP/UX
* 11/18/99 aliu Added handleReplaceBetween() to make inherit from
* Replaceable.
* 06/25/01 grhoten Removed the dependency on iostream
******************************************************************************
*/
#include "unicode/utypes.h"
#include "unicode/putil.h"
#include "unicode/locid.h"
#include "cstring.h"
#include "cmemory.h"
#include "unicode/ustring.h"
#include "mutex.h"
#include "unicode/unistr.h"
#include "unicode/unicode.h"
#include "unicode/ucnv.h"
#include "uhash.h"
#include "ustr_imp.h"
#if 0
#if U_IOSTREAM_SOURCE >= 199711
#include <iostream>
using namespace std;
#elif U_IOSTREAM_SOURCE >= 198506
#include <iostream.h>
#endif
//DEBUGGING
void
print(const UnicodeString& s,
const char *name)
{
UChar c;
cout << name << ":|";
for(int i = 0; i < s.length(); ++i) {
c = s[i];
if(c>= 0x007E || c < 0x0020)
cout << "[0x" << hex << s[i] << "]";
else
cout << (char) s[i];
}
cout << '|' << endl;
}
void
print(const UChar *s,
int32_t len,
const char *name)
{
UChar c;
cout << name << ":|";
for(int i = 0; i < len; ++i) {
c = s[i];
if(c>= 0x007E || c < 0x0020)
cout << "[0x" << hex << s[i] << "]";
else
cout << (char) s[i];
}
cout << '|' << endl;
}
// END DEBUGGING
#endif
// Local function definitions for now
// need to copy areas that may overlap
static
inline void
us_arrayCopy(const UChar *src, int32_t srcStart,
UChar *dst, int32_t dstStart, int32_t count)
{
if(count>0) {
uprv_memmove(dst+dstStart, src+srcStart, (size_t)(count*sizeof(*src)));
}
}
U_NAMESPACE_BEGIN
//========================================
// Constructors
//========================================
UnicodeString::UnicodeString()
: fLength(0),
fCapacity(US_STACKBUF_SIZE),
fArray(fStackBuffer),
fFlags(kShortString)
{}
UnicodeString::UnicodeString(int32_t capacity, UChar32 c, int32_t count)
: fLength(0),
fCapacity(US_STACKBUF_SIZE),
fArray(0),
fFlags(0)
{
if(count <= 0) {
// just allocate and do not do anything else
allocate(capacity);
} else {
// count > 0, allocate and fill the new string with count c's
int32_t unitCount = UTF_CHAR_LENGTH(c), length = count * unitCount;
if(capacity < length) {
capacity = length;
}
if(allocate(capacity)) {
int32_t i = 0;
// fill the new string with c
if(unitCount == 1) {
// fill with length UChars
while(i < length) {
fArray[i++] = (UChar)c;
}
} else {
// get the code units for c
UChar units[UTF_MAX_CHAR_LENGTH];
UTF_APPEND_CHAR_UNSAFE(units, i, c);
// now it must be i==unitCount
i = 0;
// for Unicode, unitCount can only be 1, 2, 3, or 4
// 1 is handled above
while(i < length) {
int32_t unitIdx = 0;
while(unitIdx < unitCount) {
fArray[i++]=units[unitIdx++];
}
}
}
}
fLength = length;
}
}
UnicodeString::UnicodeString(UChar ch)
: fLength(1),
fCapacity(US_STACKBUF_SIZE),
fArray(fStackBuffer),
fFlags(kShortString)
{
fStackBuffer[0] = ch;
}
UnicodeString::UnicodeString(UChar32 ch)
: fLength(1),
fCapacity(US_STACKBUF_SIZE),
fArray(fStackBuffer),
fFlags(kShortString)
{
UTextOffset i = 0;
UTF_APPEND_CHAR(fStackBuffer, i, US_STACKBUF_SIZE, ch);
fLength = i;
}
UnicodeString::UnicodeString(const UChar *text)
: fLength(0),
fCapacity(US_STACKBUF_SIZE),
fArray(fStackBuffer),
fFlags(kShortString)
{
doReplace(0, 0, text, 0, u_strlen(text));
}
UnicodeString::UnicodeString(const UChar *text,
int32_t textLength)
: fLength(0),
fCapacity(US_STACKBUF_SIZE),
fArray(fStackBuffer),
fFlags(kShortString)
{
doReplace(0, 0, text, 0, textLength);
}
UnicodeString::UnicodeString(UBool isTerminated,
const UChar *text,
int32_t textLength)
: fLength(textLength),
fCapacity(isTerminated ? textLength + 1 : textLength),
fArray((UChar *)text),
fFlags(kReadonlyAlias)
{
if(text == 0 || textLength < -1 || textLength == -1 && !isTerminated) {
setToBogus();
} else if(textLength == -1) {
// text is terminated, or else it would have failed the above test
fLength = u_strlen(text);
fCapacity = fLength + 1;
}
}
UnicodeString::UnicodeString(UChar *buff,
int32_t bufLength,
int32_t buffCapacity)
: fLength(bufLength),
fCapacity(buffCapacity),
fArray(buff),
fFlags(kWritableAlias)
{
if(buff == 0 || bufLength < 0 || bufLength > buffCapacity) {
setToBogus();
}
}
UnicodeString::UnicodeString(const char *codepageData,
const char *codepage)
: fLength(0),
fCapacity(US_STACKBUF_SIZE),
fArray(fStackBuffer),
fFlags(kShortString)
{
if(codepageData != 0) {
doCodepageCreate(codepageData, (int32_t)uprv_strlen(codepageData), codepage);
}
}
UnicodeString::UnicodeString(const char *codepageData,
int32_t dataLength,
const char *codepage)
: fLength(0),
fCapacity(US_STACKBUF_SIZE),
fArray(fStackBuffer),
fFlags(kShortString)
{
if(codepageData != 0) {
doCodepageCreate(codepageData, dataLength, codepage);
}
}
UnicodeString::UnicodeString(const char *src, int32_t srcLength,
UConverter *cnv,
UErrorCode &errorCode)
: fLength(0),
fCapacity(US_STACKBUF_SIZE),
fArray(fStackBuffer),
fFlags(kShortString)
{
if(U_SUCCESS(errorCode)) {
// check arguments
if(srcLength<-1 || (srcLength!=0 && src==0)) {
errorCode=U_ILLEGAL_ARGUMENT_ERROR;
} else {
// get input length
if(srcLength==-1) {
srcLength=(int32_t)uprv_strlen(src);
}
if(srcLength>0) {
if(cnv!=0) {
// use the provided converter
ucnv_resetToUnicode(cnv);
doCodepageCreate(src, srcLength, cnv, errorCode);
} else {
// use the default converter
cnv=u_getDefaultConverter(&errorCode);
doCodepageCreate(src, srcLength, cnv, errorCode);
u_releaseDefaultConverter(cnv);
}
}
}
if(U_FAILURE(errorCode)) {
setToBogus();
}
}
}
UnicodeString::UnicodeString(const UnicodeString& that)
: Replaceable(),
fLength(0),
fCapacity(US_STACKBUF_SIZE),
fArray(fStackBuffer),
fFlags(kShortString)
{
*this = that;
}
//========================================
// array allocation
//========================================
UBool
UnicodeString::allocate(int32_t capacity) {
if(capacity <= US_STACKBUF_SIZE) {
fArray = fStackBuffer;
fCapacity = US_STACKBUF_SIZE;
fFlags = kShortString;
} else {
// count bytes for the refCounter and the string capacity, and
// round up to a multiple of 16; then divide by 4 and allocate int32_t's
// to be safely aligned for the refCount
int32_t words = (int32_t)(((sizeof(int32_t) + capacity * U_SIZEOF_UCHAR + 15) & ~15) >> 2);
int32_t *array = new int32_t[words];
if(array != 0) {
// set initial refCount and point behind the refCount
*array++ = 1;
// have fArray point to the first UChar
fArray = (UChar *)array;
fCapacity = (int32_t)((words - 1) * (sizeof(int32_t) / U_SIZEOF_UCHAR));
fFlags = kLongString;
} else {
fLength = 0;
fCapacity = 0;
fFlags = kIsBogus;
return FALSE;
}
}
return TRUE;
}
//========================================
// Destructor
//========================================
UnicodeString::~UnicodeString()
{
releaseArray();
}
//========================================
// Assignment
//========================================
UnicodeString&
UnicodeString::operator= (const UnicodeString& src)
{
// if assigning to ourselves, do nothing
if(this == 0 || this == &src) {
return *this;
}
// is the right side bogus?
if(&src == 0 || src.isBogus()) {
setToBogus();
return *this;
}
// delete the current contents
releaseArray();
// we always copy the length
fLength = src.fLength;
if(fLength == 0) {
// empty string - use the stack buffer
fArray = fStackBuffer;
fCapacity = US_STACKBUF_SIZE;
fFlags = kShortString;
return *this;
}
// fLength>0 and not an "open" src.getBuffer(minCapacity)
switch(src.fFlags) {
case kShortString:
// short string using the stack buffer, do the same
fArray = fStackBuffer;
fCapacity = US_STACKBUF_SIZE;
fFlags = kShortString;
uprv_memcpy(fStackBuffer, src.fArray, fLength * U_SIZEOF_UCHAR);
break;
case kLongString:
// src uses a refCounted string buffer, use that buffer with refCount
// src is const, use a cast - we don't really change it
((UnicodeString &)src).addRef();
// fall through to readonly alias copying: copy all fields
case kReadonlyAlias:
// src is a readonly alias, do the same
fArray = src.fArray;
fCapacity = src.fCapacity;
fFlags = src.fFlags;
break;
case kWritableAlias:
// src is a writable alias; we make a copy of that instead
if(allocate(fLength)) {
uprv_memcpy(fArray, src.fArray, fLength * U_SIZEOF_UCHAR);
break;
}
// if there is not enough memory, then fall through to setting to bogus
default:
// if src is bogus, set ourselves to bogus
// do not call setToBogus() here because fArray and fFlags are not consistent here
fArray = 0;
fLength = 0;
fCapacity = 0;
fFlags = kIsBogus;
break;
}
return *this;
}
//========================================
// Miscellaneous operations
//========================================
int32_t
UnicodeString::numDisplayCells( UTextOffset start,
int32_t length,
UBool asian) const
{
// pin indices to legal values
pinIndices(start, length);
UChar32 c;
int32_t result = 0;
UTextOffset limit = start + length;
while(start < limit) {
UTF_NEXT_CHAR(fArray, start, limit, c);
switch(Unicode::getCellWidth(c)) {
case Unicode::ZERO_WIDTH:
break;
case Unicode::HALF_WIDTH:
result += 1;
break;
case Unicode::FULL_WIDTH:
result += 2;
break;
case Unicode::NEUTRAL:
result += (asian ? 2 : 1);
break;
}
}
return result;
}
UCharReference
UnicodeString::operator[] (UTextOffset pos)
{
return UCharReference(this, pos);
}
UnicodeString UnicodeString::unescape() const {
UnicodeString result;
for (int32_t i=0; i<length(); ) {
UChar32 c = charAt(i++);
if (c == 0x005C /*'\\'*/) {
c = unescapeAt(i); // advances i
if (c == (UChar32)0xFFFFFFFF) {
result.remove(); // return empty string
break; // invalid escape sequence
}
}
result.append(c);
}
return result;
}
// u_unescapeAt() callback to get a UChar from a UnicodeString
U_CDECL_BEGIN
static UChar U_CALLCONV
UnicodeString_charAt(int32_t offset, void *context) {
return ((UnicodeString*) context)->charAt(offset);
}
U_CDECL_END
UChar32 UnicodeString::unescapeAt(int32_t &offset) const {
return u_unescapeAt(UnicodeString_charAt, &offset, length(), (void*)this);
}
//========================================
// Read-only implementation
//========================================
int8_t
UnicodeString::doCompare( UTextOffset start,
int32_t length,
const UChar *srcChars,
UTextOffset srcStart,
int32_t srcLength) const
{
// compare illegal string values
if(isBogus()) {
if(srcChars==0) {
return 0;
} else {
return -1;
}
} else if(srcChars==0) {
return 1;
}
// pin indices to legal values
pinIndices(start, length);
// get the correct pointer
const UChar *chars = getArrayStart();
chars += start;
srcChars += srcStart;
UTextOffset minLength;
int8_t lengthResult;
// are we comparing different lengths?
if(length != srcLength) {
if(length < srcLength) {
minLength = length;
lengthResult = -1;
} else {
minLength = srcLength;
lengthResult = 1;
}
} else {
minLength = length;
lengthResult = 0;
}
/*
* note that uprv_memcmp() returns an int but we return an int8_t;
* we need to take care not to truncate the result -
* one way to do this is to right-shift the value to
* move the sign bit into the lower 8 bits and making sure that this
* does not become 0 itself
*/
if(minLength > 0 && chars != srcChars) {
int32_t result;
# if U_IS_BIG_ENDIAN
// big-endian: byte comparison works
result = uprv_memcmp(chars, srcChars, minLength * sizeof(UChar));
if(result != 0) {
return (int8_t)(result >> 15 | 1);
}
# else
// little-endian: compare UChar units
do {
result = ((int32_t)*(chars++) - (int32_t)*(srcChars++));
if(result != 0) {
return (int8_t)(result >> 15 | 1);
}
} while(--minLength > 0);
# endif
}
return lengthResult;
}
/* String compare in code point order - doCompare() compares in code unit order. */
int8_t
UnicodeString::doCompareCodePointOrder(UTextOffset start,
int32_t length,
const UChar *srcChars,
UTextOffset srcStart,
int32_t srcLength) const
{
// compare illegal string values
if(isBogus()) {
if(srcChars==0) {
return 0;
} else {
return -1;
}
} else if(srcChars==0) {
return 1;
}
// pin indices to legal values
pinIndices(start, length);
// get the correct pointer
const UChar *chars = getArrayStart();
chars += start;
srcChars += srcStart;
UTextOffset minLength;
int8_t lengthResult;
// are we comparing different lengths?
if(length != srcLength) {
if(length < srcLength) {
minLength = length;
lengthResult = -1;
} else {
minLength = srcLength;
lengthResult = 1;
}
} else {
minLength = length;
lengthResult = 0;
}
if(minLength > 0 && chars != srcChars) {
int32_t diff = u_memcmpCodePointOrder(chars, srcChars, minLength);
if(diff!=0) {
return (int8_t)(diff >> 15 | 1);
}
}
return lengthResult;
}
int8_t
UnicodeString::doCaseCompare(UTextOffset start,
int32_t length,
const UChar *srcChars,
UTextOffset srcStart,
int32_t srcLength,
uint32_t options) const
{
// compare illegal string values
if(isBogus()) {
if(srcChars==0) {
return 0;
} else {
return -1;
}
} else if(srcChars==0) {
return 1;
}
// pin indices to legal values
pinIndices(start, length);
// get the correct pointer
const UChar *chars = getArrayStart();
chars += start;
srcChars += srcStart;
if(chars != srcChars) {
int32_t result=u_internalStrcasecmp(chars, length, srcChars, srcLength, options);
if(result!=0) {
return (int8_t)(result >> 24 | 1);
}
} else if(length != srcLength) {
return (int8_t)((length - srcLength) >> 24 | 1);
}
return 0;
}
int32_t
UnicodeString::getLength() const {
return length();
}
UChar
UnicodeString::getCharAt(UTextOffset offset) const {
return charAt(offset);
}
UChar32
UnicodeString::getChar32At(UTextOffset offset) const {
return char32At(offset);
}
int32_t
UnicodeString::countChar32(UTextOffset start, int32_t length) const {
pinIndices(start, length);
// if(isBogus()) then fArray==0 and start==0 - u_countChar32() checks for NULL
return u_countChar32(fArray+start, length);
}
UTextOffset
UnicodeString::moveIndex32(UTextOffset index, int32_t delta) const {
// pin index
if(index<0) {
index=0;
} else if(index>fLength) {
index=fLength;
}
if(delta>0) {
UTF_FWD_N(fArray, index, fLength, delta);
} else {
UTF_BACK_N(fArray, 0, index, -delta);
}
return index;
}
void
UnicodeString::doExtract(UTextOffset start,
int32_t length,
UChar *dst,
UTextOffset dstStart) const
{
// pin indices to legal values
pinIndices(start, length);
// do not copy anything if we alias dst itself
if(fArray + start != dst + dstStart) {
us_arrayCopy(getArrayStart(), start, dst, dstStart, length);
}
}
int32_t
UnicodeString::extract(UChar *dest, int32_t destCapacity,
UErrorCode &errorCode) const {
if(U_SUCCESS(errorCode)) {
if(isBogus() || destCapacity<0 || (destCapacity>0 && dest==0)) {
errorCode=U_ILLEGAL_ARGUMENT_ERROR;
} else {
if(fLength>0 && fLength<=destCapacity && fArray!=dest) {
uprv_memcpy(dest, fArray, fLength*U_SIZEOF_UCHAR);
}
return u_terminateUChars(dest, destCapacity, fLength, &errorCode);
}
}
return fLength;
}
UTextOffset
UnicodeString::indexOf(const UChar *srcChars,
UTextOffset srcStart,
int32_t srcLength,
UTextOffset start,
int32_t length) const
{
if(isBogus() || srcChars == 0 || srcStart < 0 || srcLength <= 0) {
return -1;
}
// now we will only work with srcLength-1
--srcLength;
// get the indices within bounds
pinIndices(start, length);
// set length for the last possible match start position
// note the --srcLength above
length -= srcLength;
if(length <= 0) {
return -1;
}
const UChar *array = getArrayStart();
UTextOffset limit = start + length;
// search for the first char, then compare the rest of the string
// increment srcStart here for that, matching the --srcLength above
UChar ch = srcChars[srcStart++];
do {
if(array[start] == ch && (srcLength == 0 || compare(start + 1, srcLength, srcChars, srcStart, srcLength) == 0)) {
return start;
}
} while(++start < limit);
return -1;
}
UTextOffset
UnicodeString::doIndexOf(UChar c,
UTextOffset start,
int32_t length) const
{
// pin indices
pinIndices(start, length);
if(length == 0) {
return -1;
}
// find the first occurrence of c
const UChar *begin = getArrayStart() + start;
const UChar *limit = begin + length;
do {
if(*begin == c) {
return begin - getArrayStart();
}
} while(++begin < limit);
return -1;
}
UTextOffset
UnicodeString::lastIndexOf(const UChar *srcChars,
UTextOffset srcStart,
int32_t srcLength,
UTextOffset start,
int32_t length) const
{
if(isBogus() || srcChars == 0 || srcStart < 0 || srcLength <= 0) {
return -1;
}
// now we will only work with srcLength-1
--srcLength;
// get the indices within bounds
pinIndices(start, length);
// set length for the last possible match start position
// note the --srcLength above
length -= srcLength;
if(length <= 0) {
return -1;
}
const UChar *array = getArrayStart();
UTextOffset pos;
// search for the first char, then compare the rest of the string
// increment srcStart here for that, matching the --srcLength above
UChar ch = srcChars[srcStart++];
pos = start + length;
do {
if(array[--pos] == ch && (srcLength == 0 || compare(pos + 1, srcLength, srcChars, srcStart, srcLength) == 0)) {
return pos;
}
} while(pos > start);
return -1;
}
UTextOffset
UnicodeString::doLastIndexOf(UChar c,
UTextOffset start,
int32_t length) const
{
if(isBogus()) {
return -1;
}
// pin indices
pinIndices(start, length);
if(length == 0) {
return -1;
}
const UChar *begin = getArrayStart() + start;
const UChar *limit = begin + length;
do {
if(*--limit == c) {
return limit - getArrayStart();
}
} while(limit > begin);
return -1;
}
UnicodeString&
UnicodeString::findAndReplace(UTextOffset start,
int32_t length,
const UnicodeString& oldText,
UTextOffset oldStart,
int32_t oldLength,
const UnicodeString& newText,
UTextOffset newStart,
int32_t newLength)
{
if(isBogus() || oldText.isBogus() || newText.isBogus()) {
return *this;
}
pinIndices(start, length);
oldText.pinIndices(oldStart, oldLength);
newText.pinIndices(newStart, newLength);
if(oldLength == 0) {
return *this;
}
while(length > 0 && length >= oldLength) {
UTextOffset pos = indexOf(oldText, oldStart, oldLength, start, length);
if(pos < 0) {
// no more oldText's here: done
break;
} else {
// we found oldText, replace it by newText and go beyond it
replace(pos, oldLength, newText, newStart, newLength);
length -= pos + oldLength - start;
start = pos + newLength;
}
}
return *this;
}
//========================================
// Write implementation
//========================================
void
UnicodeString::setToBogus()
{
releaseArray();
fArray = 0;
fCapacity = fLength = 0;
fFlags = kIsBogus;
}
// setTo() analogous to the readonly-aliasing constructor with the same signature
UnicodeString &
UnicodeString::setTo(UBool isTerminated,
const UChar *text,
int32_t textLength)
{
if(fFlags & kOpenGetBuffer) {
// do not modify a string that has an "open" getBuffer(minCapacity)
return *this;
}
if(text == 0 || textLength < -1 || textLength == -1 && !isTerminated) {
setToBogus();
return *this;
}
releaseArray();
fArray = (UChar *)text;
if(textLength != -1) {
fLength = textLength;
} else {
// text is terminated, or else it would have failed the above test
fLength = u_strlen(text);
fCapacity = fLength + 1;
}
fCapacity = isTerminated ? fLength + 1 : fLength;
fFlags = kReadonlyAlias;
return *this;
}
// setTo() analogous to the writable-aliasing constructor with the same signature
UnicodeString &
UnicodeString::setTo(UChar *buffer,
int32_t buffLength,
int32_t buffCapacity) {
if(fFlags & kOpenGetBuffer) {
// do not modify a string that has an "open" getBuffer(minCapacity)
return *this;
}
if(buffer == 0 || buffLength < 0 || buffLength > buffCapacity) {
setToBogus();
return *this;
}
releaseArray();
fArray = buffer;
fLength = buffLength;
fCapacity = buffCapacity;
fFlags = kWritableAlias;
return *this;
}
UnicodeString&
UnicodeString::setCharAt(UTextOffset offset,
UChar c)
{
if(cloneArrayIfNeeded() && fLength > 0) {
if(offset < 0) {
offset = 0;
} else if(offset >= fLength) {
offset = fLength - 1;
}
fArray[offset] = c;
}
return *this;
}
/*
* Implement argument checking and buffer handling
* for string case mapping as a common function.
*/
enum {
TO_LOWER,
TO_UPPER,
FOLD_CASE
};
UnicodeString &
UnicodeString::toLower() {
return caseMap(Locale::getDefault(), 0, TO_LOWER);
}
UnicodeString &
UnicodeString::toLower(const Locale &locale) {
return caseMap(locale, 0, TO_LOWER);
}
UnicodeString &
UnicodeString::toUpper() {
return caseMap(Locale::getDefault(), 0, TO_UPPER);
}
UnicodeString &
UnicodeString::toUpper(const Locale &locale) {
return caseMap(locale, 0, TO_UPPER);
}
UnicodeString &
UnicodeString::foldCase(uint32_t options) {
return caseMap(Locale::getDefault(), options, FOLD_CASE);
}
// static helper function for string case mapping
// called by u_internalStrToUpper/Lower()
UBool U_CALLCONV
UnicodeString::growBuffer(void *context,
UChar **buffer, int32_t *pCapacity, int32_t reqCapacity,
int32_t length) {
UnicodeString *me = (UnicodeString *)context;
me->fLength = length;
if(me->cloneArrayIfNeeded(reqCapacity)) {
*buffer = me->fArray;
*pCapacity = me->fCapacity;
return TRUE;
} else {
return FALSE;
}
}
UnicodeString &
UnicodeString::caseMap(const Locale& locale,
uint32_t options,
int32_t toWhichCase) {
if(fLength <= 0) {
// nothing to do
return *this;
}
// We need to allocate a new buffer for the internal string case mapping function.
// This is very similar to how doReplace() below keeps the old array pointer
// and deletes the old array itself after it is done.
// In addition, we are forcing cloneArrayIfNeeded() to always allocate a new array.
UChar *oldArray = fArray;
int32_t oldLength = fLength;
int32_t *bufferToDelete = 0;
// Make sure that if the string is in fStackBuffer we do not overwrite it!
int32_t capacity;
if(fLength <= US_STACKBUF_SIZE) {
if(fArray == fStackBuffer) {
capacity = 2 * US_STACKBUF_SIZE; // make sure that cloneArrayIfNeeded() allocates a new buffer
} else {
capacity = US_STACKBUF_SIZE;
}
} else {
capacity = fLength + 2;
}
if(!cloneArrayIfNeeded(capacity, capacity, FALSE, &bufferToDelete, TRUE)) {
return *this;
}
UErrorCode errorCode = U_ZERO_ERROR;
if(toWhichCase==TO_LOWER) {
fLength = u_internalStrToLower(fArray, fCapacity,
oldArray, oldLength,
locale.getName(),
growBuffer, this,
&errorCode);
} else if(toWhichCase==TO_UPPER) {
fLength = u_internalStrToUpper(fArray, fCapacity,
oldArray, oldLength,
locale.getName(),
growBuffer, this,
&errorCode);
} else {
fLength = u_internalStrFoldCase(fArray, fCapacity,
oldArray, oldLength,
options,
growBuffer, this,
&errorCode);
}
delete [] bufferToDelete;
if(U_FAILURE(errorCode)) {
setToBogus();
}
return *this;
}
UnicodeString&
UnicodeString::doReplace( UTextOffset start,
int32_t length,
const UnicodeString& src,
UTextOffset srcStart,
int32_t srcLength)
{
if(!src.isBogus()) {
// pin the indices to legal values
src.pinIndices(srcStart, srcLength);
// get the characters from src
// and replace the range in ourselves with them
return doReplace(start, length, src.getArrayStart(), srcStart, srcLength);
} else {
// remove the range
return doReplace(start, length, 0, 0, 0);
}
}
UnicodeString&
UnicodeString::doReplace(UTextOffset start,
int32_t length,
const UChar *srcChars,
UTextOffset srcStart,
int32_t srcLength)
{
// if we're bogus, set us to empty first
if(isBogus()) {
fArray = fStackBuffer;
fLength = 0;
fCapacity = US_STACKBUF_SIZE;
fFlags = kShortString;
}
if(srcChars == 0) {
srcStart = srcLength = 0;
}
int32_t *bufferToDelete = 0;
// the following may change fArray but will not copy the current contents;
// therefore we need to keep the current fArray
UChar *oldArray = fArray;
int32_t oldLength = fLength;
// pin the indices to legal values
pinIndices(start, length);
// calculate the size of the string after the replace
int32_t newSize = oldLength - length + srcLength;
// clone our array and allocate a bigger array if needed
if(!cloneArrayIfNeeded(newSize, newSize + (newSize >> 2) + kGrowSize,
FALSE, &bufferToDelete)
) {
return *this;
}
// now do the replace
if(fArray != oldArray) {
// if fArray changed, then we need to copy everything except what will change
us_arrayCopy(oldArray, 0, fArray, 0, start);
us_arrayCopy(oldArray, start + length,
fArray, start + srcLength,
oldLength - (start + length));
} else if(length != srcLength) {
// fArray did not change; copy only the portion that isn't changing, leaving a hole
us_arrayCopy(oldArray, start + length,
fArray, start + srcLength,
oldLength - (start + length));
}
// now fill in the hole with the new string
us_arrayCopy(srcChars, srcStart, getArrayStart(), start, srcLength);
fLength = newSize;
// delayed delete in case srcChars == fArray when we started, and
// to keep oldArray alive for the above operations
delete [] bufferToDelete;
return *this;
}
/**
* Replaceable API
*/
void
UnicodeString::handleReplaceBetween(UTextOffset start,
UTextOffset limit,
const UnicodeString& text) {
replaceBetween(start, limit, text);
}
/**
* Replaceable API
*/
void
UnicodeString::copy(int32_t start, int32_t limit, int32_t dest) {
UChar* text = new UChar[limit - start];
extractBetween(start, limit, text, 0);
insert(dest, text, 0, limit - start);
delete[] text;
}
UnicodeString&
UnicodeString::doReverse(UTextOffset start,
int32_t length)
{
if(fLength <= 1 || !cloneArrayIfNeeded()) {
return *this;
}
// pin the indices to legal values
pinIndices(start, length);
UChar *left = getArrayStart() + start;
UChar *right = getArrayStart() + start + length;
UChar swap;
UBool hasSupplementary = FALSE;
while(left < --right) {
hasSupplementary |= (UBool)UTF_IS_LEAD(swap = *left);
hasSupplementary |= (UBool)UTF_IS_LEAD(*left++ = *right);
*right = swap;
}
/* if there are supplementary code points in the reversed range, then re-swap their surrogates */
if(hasSupplementary) {
UChar swap2;
left = getArrayStart() + start;
right = getArrayStart() + start + length - 1; // -1 so that we can look at *(left+1) if left<right
while(left < right) {
if(UTF_IS_TRAIL(swap = *left) && UTF_IS_LEAD(swap2 = *(left + 1))) {
*left++ = swap2;
*left++ = swap;
} else {
++left;
}
}
}
return *this;
}
UBool
UnicodeString::padLeading(int32_t targetLength,
UChar padChar)
{
if(fLength >= targetLength || !cloneArrayIfNeeded(targetLength)) {
return FALSE;
} else {
// move contents up by padding width
int32_t start = targetLength - fLength;
us_arrayCopy(fArray, 0, fArray, start, fLength);
// fill in padding character
while(--start >= 0) {
fArray[start] = padChar;
}
fLength = targetLength;
return TRUE;
}
}
UBool
UnicodeString::padTrailing(int32_t targetLength,
UChar padChar)
{
if(fLength >= targetLength || !cloneArrayIfNeeded(targetLength)) {
return FALSE;
} else {
// fill in padding character
int32_t length = targetLength;
while(--length >= fLength) {
fArray[length] = padChar;
}
fLength = targetLength;
return TRUE;
}
}
UnicodeString&
UnicodeString::trim()
{
if(isBogus()) {
return *this;
}
UChar32 c;
UTextOffset i = fLength, length;
// first cut off trailing white space
for(;;) {
length = i;
if(i <= 0) {
break;
}
UTF_PREV_CHAR(fArray, 0, i, c);
if(!(c == 0x20 || Unicode::isWhitespace(c))) {
break;
}
}
if(length < fLength) {
fLength = length;
}
// find leading white space
UTextOffset start;
i = 0;
for(;;) {
start = i;
if(i >= length) {
break;
}
UTF_NEXT_CHAR(fArray, i, length, c);
if(!(c == 0x20 || Unicode::isWhitespace(c))) {
break;
}
}
// move string forward over leading white space
if(start > 0) {
doReplace(0, start, 0, 0, 0);
}
return *this;
}
//========================================
// Hashing
//========================================
int32_t
UnicodeString::doHashCode() const
{
/* Delegate hash computation to uhash. This makes UnicodeString
* hashing consistent with UChar* hashing. */
int32_t hashCode = uhash_hashUCharsN(getArrayStart(), fLength);
if (hashCode == kInvalidHashCode) {
hashCode = kEmptyHashCode;
}
return hashCode;
}
//========================================
// Codeset conversion
//========================================
int32_t
UnicodeString::extract(UTextOffset start,
int32_t length,
char *target,
uint32_t dstSize,
const char *codepage) const
{
// if the arguments are illegal, then do nothing
if(/*dstSize < 0 || */(dstSize > 0 && target == 0)) {
return 0;
}
// pin the indices to legal values
pinIndices(start, length);
// create the converter
UConverter *converter;
UErrorCode status = U_ZERO_ERROR;
// just write the NUL if the string length is 0
if(length == 0) {
return u_terminateChars(target, dstSize, 0, &status);
}
// if the codepage is the default, use our cache
// if it is an empty string, then use the "invariant character" conversion
if (codepage == 0) {
converter = u_getDefaultConverter(&status);
} else if (*codepage == 0) {
// use the "invariant characters" conversion
int32_t destLength;
// careful: dstSize is unsigned! (0xffffffff means "unlimited")
if(dstSize >= 0x80000000) {
destLength = length;
// make sure that the NUL-termination works (takes int32_t)
dstSize=0x7fffffff;
} else if(length <= (int32_t)dstSize) {
destLength = length;
} else {
destLength = (int32_t)dstSize;
}
u_UCharsToChars(getArrayStart() + start, target, destLength);
return u_terminateChars(target, (int32_t)dstSize, length, &status);
} else {
converter = ucnv_open(codepage, &status);
}
length = doExtract(start, length, target, (int32_t)dstSize, converter, status);
// close the converter
if (codepage == 0) {
u_releaseDefaultConverter(converter);
} else {
ucnv_close(converter);
}
return length;
}
int32_t
UnicodeString::extract(char *dest, int32_t destCapacity,
UConverter *cnv,
UErrorCode &errorCode) const {
if(U_FAILURE(errorCode)) {
return 0;
}
if(isBogus() || destCapacity<0 || (destCapacity>0 && dest==0)) {
errorCode=U_ILLEGAL_ARGUMENT_ERROR;
return 0;
}
// nothing to do?
if(fLength<=0) {
return u_terminateChars(dest, destCapacity, 0, &errorCode);
}
// get the converter
UBool isDefaultConverter;
if(cnv==0) {
isDefaultConverter=TRUE;
cnv=u_getDefaultConverter(&errorCode);
if(U_FAILURE(errorCode)) {
return 0;
}
} else {
isDefaultConverter=FALSE;
ucnv_resetFromUnicode(cnv);
}
// convert
int32_t length=doExtract(0, fLength, dest, destCapacity, cnv, errorCode);
// release the converter
if(isDefaultConverter) {
u_releaseDefaultConverter(cnv);
}
return length;
}
int32_t
UnicodeString::doExtract(UTextOffset start, int32_t length,
char *dest, int32_t destCapacity,
UConverter *cnv,
UErrorCode &errorCode) const {
if(U_FAILURE(errorCode)) {
if(destCapacity!=0) {
*dest=0;
}
return 0;
}
const UChar *src=fArray+start, *srcLimit=src+length;
char *originalDest=dest;
const char *destLimit;
if(destCapacity==0) {
destLimit=dest=0;
} else if(destCapacity==-1) {
// Pin the limit to U_MAX_PTR if the "magic" destCapacity is used.
destLimit=(char*)U_MAX_PTR(dest);
// for NUL-termination, translate into highest int32_t
destCapacity=0x7fffffff;
} else {
destLimit=dest+destCapacity;
}
// perform the conversion
ucnv_fromUnicode(cnv, &dest, destLimit, &src, srcLimit, 0, TRUE, &errorCode);
length=(int32_t)(dest-originalDest);
// if an overflow occurs, then get the preflighting length
if(errorCode==U_BUFFER_OVERFLOW_ERROR) {
char buffer[1024];
destLimit=buffer+sizeof(buffer);
do {
dest=buffer;
errorCode=U_ZERO_ERROR;
ucnv_fromUnicode(cnv, &dest, destLimit, &src, srcLimit, 0, TRUE, &errorCode);
length+=(int32_t)(dest-buffer);
} while(errorCode==U_BUFFER_OVERFLOW_ERROR);
}
return u_terminateChars(originalDest, destCapacity, length, &errorCode);
}
void
UnicodeString::doCodepageCreate(const char *codepageData,
int32_t dataLength,
const char *codepage)
{
// if there's nothing to convert, do nothing
if(codepageData == 0 || dataLength <= 0) {
return;
}
UErrorCode status = U_ZERO_ERROR;
// create the converter
// if the codepage is the default, use our cache
// if it is an empty string, then use the "invariant character" conversion
UConverter *converter = (codepage == 0 ?
u_getDefaultConverter(&status) :
*codepage == 0 ?
0 :
ucnv_open(codepage, &status));
// if we failed, set the appropriate flags and return
if(U_FAILURE(status)) {
setToBogus();
return;
}
// perform the conversion
if(converter == 0) {
// use the "invariant characters" conversion
if(cloneArrayIfNeeded(dataLength, dataLength, FALSE)) {
u_charsToUChars(codepageData, getArrayStart(), dataLength);
fLength = dataLength;
} else {
setToBogus();
}
return;
}
// convert using the real converter
doCodepageCreate(codepageData, dataLength, converter, status);
if(U_FAILURE(status)) {
setToBogus();
}
// close the converter
if(codepage == 0) {
u_releaseDefaultConverter(converter);
} else {
ucnv_close(converter);
}
}
void
UnicodeString::doCodepageCreate(const char *codepageData,
int32_t dataLength,
UConverter *converter,
UErrorCode &status) {
if(U_FAILURE(status)) {
return;
}
// set up the conversion parameters
const char *mySource = codepageData;
const char *mySourceEnd = mySource + dataLength;
UChar *myTarget;
// estimate the size needed:
// 1.25 UChar's per source byte should cover most cases
int32_t arraySize = dataLength + (dataLength >> 2);
// we do not care about the current contents
UBool doCopyArray = FALSE;
for(;;) {
if(!cloneArrayIfNeeded(arraySize, arraySize, doCopyArray)) {
setToBogus();
break;
}
// perform the conversion
myTarget = fArray + fLength;
ucnv_toUnicode(converter, &myTarget, fArray + fCapacity,
&mySource, mySourceEnd, 0, TRUE, &status);
// update the conversion parameters
fLength = myTarget - fArray;
// allocate more space and copy data, if needed
if(status == U_BUFFER_OVERFLOW_ERROR) {
// reset the error code
status = U_ZERO_ERROR;
// keep the previous conversion results
doCopyArray = TRUE;
// estimate the new size needed, larger than before
// try 2 UChar's per remaining source byte
arraySize = fLength + 2 * (mySourceEnd - mySource);
} else {
break;
}
}
}
//========================================
// External Buffer
//========================================
UChar *
UnicodeString::getBuffer(int32_t minCapacity) {
if(minCapacity>=-1 && cloneArrayIfNeeded(minCapacity)) {
fFlags|=kOpenGetBuffer;
fLength=0;
return fArray;
} else {
return 0;
}
}
void
UnicodeString::releaseBuffer(int32_t newLength) {
if(fFlags&kOpenGetBuffer && newLength>=-1) {
// set the new fLength
if(newLength==-1) {
// the new length is the string length, capped by fCapacity
const UChar *p=fArray, *limit=fArray+fCapacity;
while(p<limit && *p!=0) {
++p;
}
fLength=(int32_t)(p-fArray);
} else if(newLength<=fCapacity) {
fLength=newLength;
} else {
fLength=fCapacity;
}
fFlags&=~kOpenGetBuffer;
}
}
//========================================
// Miscellaneous
//========================================
UBool
UnicodeString::cloneArrayIfNeeded(int32_t newCapacity,
int32_t growCapacity,
UBool doCopyArray,
int32_t **pBufferToDelete,
UBool forceClone) {
// default parameters need to be static, therefore
// the defaults are -1 to have convenience defaults
if(newCapacity == -1) {
newCapacity = fCapacity;
}
// while a getBuffer(minCapacity) is "open",
// prevent any modifications of the string by returning FALSE here
if(fFlags & kOpenGetBuffer) {
return FALSE;
}
// if we're bogus, set us to empty first
if(fFlags & kIsBogus) {
fArray = fStackBuffer;
fLength = 0;
fCapacity = US_STACKBUF_SIZE;
fFlags = kShortString;
}
/*
* We need to make a copy of the array if
* the buffer is read-only, or
* the buffer is refCounted (shared), and refCount>1, or
* the buffer is too small.
* Return FALSE if memory could not be allocated.
*/
if(forceClone ||
fFlags & kBufferIsReadonly ||
fFlags & kRefCounted && refCount() > 1 ||
newCapacity > fCapacity
) {
// save old values
UChar *array = fArray;
uint16_t flags = fFlags;
// check growCapacity for default value and use of the stack buffer
if(growCapacity == -1) {
growCapacity = newCapacity;
} else if(newCapacity <= US_STACKBUF_SIZE && growCapacity > US_STACKBUF_SIZE) {
growCapacity = US_STACKBUF_SIZE;
}
// allocate a new array
if(allocate(growCapacity) ||
newCapacity < growCapacity && allocate(newCapacity)
) {
if(doCopyArray) {
// copy the contents
// do not copy more than what fits - it may be smaller than before
if(fCapacity < fLength) {
fLength = fCapacity;
}
us_arrayCopy(array, 0, fArray, 0, fLength);
} else {
fLength = 0;
}
// release the old array
if(flags & kRefCounted) {
// the array is refCounted; decrement and release if 0
int32_t *pRefCount = ((int32_t *)array - 1);
if(--*pRefCount == 0) {
if(pBufferToDelete == 0) {
delete [] pRefCount;
} else {
// the caller requested to delete it himself
*pBufferToDelete = pRefCount;
}
}
}
} else {
// not enough memory for growCapacity and not even for the smaller newCapacity
// reset the old values for setToBogus() to release the array
fArray = array;
fFlags = flags;
setToBogus();
return FALSE;
}
}
return TRUE;
}
U_NAMESPACE_END
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