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/*
*******************************************************************************
*
* Copyright (C) 1999-2007, International Business Machines
* Corporation and others. All Rights Reserved.
*
*******************************************************************************
* file name: unistr_case.cpp
* encoding: US-ASCII
* tab size: 8 (not used)
* indentation:2
*
* created on: 2004aug19
* created by: Markus W. Scherer
*
* Case-mapping functions moved here from unistr.cpp
*/
#include "unicode/utypes.h"
#include "unicode/putil.h"
#include "unicode/locid.h"
#include "cstring.h"
#include "cmemory.h"
#include "unicode/ustring.h"
#include "unicode/unistr.h"
#include "unicode/uchar.h"
#include "unicode/ubrk.h"
#include "ustr_imp.h"
#include "unormimp.h"
#include "uhash.h"
U_NAMESPACE_BEGIN
//========================================
// Read-only implementation
//========================================
int8_t
UnicodeString::doCaseCompare(int32_t start,
int32_t length,
const UChar *srcChars,
int32_t srcStart,
int32_t srcLength,
uint32_t options) const
{
// compare illegal string values
// treat const UChar *srcChars==NULL as an empty string
if(isBogus()) {
return -1;
}
// pin indices to legal values
pinIndices(start, length);
if(srcChars == NULL) {
srcStart = srcLength = 0;
}
// get the correct pointer
const UChar *chars = getArrayStart();
chars += start;
srcChars += srcStart;
if(chars != srcChars) {
UErrorCode errorCode=U_ZERO_ERROR;
int32_t result=u_strcmpFold(chars, length, srcChars, srcLength,
options|U_COMPARE_IGNORE_CASE, &errorCode);
if(result!=0) {
return (int8_t)(result >> 24 | 1);
}
} else {
// get the srcLength if necessary
if(srcLength < 0) {
srcLength = u_strlen(srcChars + srcStart);
}
if(length != srcLength) {
return (int8_t)((length - srcLength) >> 24 | 1);
}
}
return 0;
}
//========================================
// Write implementation
//========================================
/*
* Implement argument checking and buffer handling
* for string case mapping as a common function.
*/
UnicodeString &
UnicodeString::caseMap(BreakIterator *titleIter,
const char *locale,
uint32_t options,
int32_t toWhichCase) {
if(fLength <= 0) {
// nothing to do
return *this;
}
UErrorCode errorCode;
errorCode = U_ZERO_ERROR;
const UCaseProps *csp=ucase_getSingleton(&errorCode);
if(U_FAILURE(errorCode)) {
setToBogus();
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 + 20;
}
if(!cloneArrayIfNeeded(capacity, capacity, FALSE, &bufferToDelete, TRUE)) {
return *this;
}
// Case-map, and if the result is too long, then reallocate and repeat.
do {
errorCode = U_ZERO_ERROR;
if(toWhichCase==TO_LOWER) {
fLength = ustr_toLower(csp, fArray, fCapacity,
oldArray, oldLength,
locale, &errorCode);
} else if(toWhichCase==TO_UPPER) {
fLength = ustr_toUpper(csp, fArray, fCapacity,
oldArray, oldLength,
locale, &errorCode);
} else if(toWhichCase==TO_TITLE) {
#if UCONFIG_NO_BREAK_ITERATION
errorCode=U_UNSUPPORTED_ERROR;
#else
fLength = ustr_toTitle(csp, fArray, fCapacity,
oldArray, oldLength,
(UBreakIterator *)titleIter, locale, options, &errorCode);
#endif
} else {
fLength = ustr_foldCase(csp, fArray, fCapacity,
oldArray, oldLength,
options,
&errorCode);
}
} while(errorCode==U_BUFFER_OVERFLOW_ERROR && cloneArrayIfNeeded(fLength, fLength, FALSE));
if (bufferToDelete) {
uprv_free(bufferToDelete);
}
if(U_FAILURE(errorCode)) {
setToBogus();
}
return *this;
}
UnicodeString &
UnicodeString::toLower() {
return caseMap(0, Locale::getDefault().getName(), 0, TO_LOWER);
}
UnicodeString &
UnicodeString::toLower(const Locale &locale) {
return caseMap(0, locale.getName(), 0, TO_LOWER);
}
UnicodeString &
UnicodeString::toUpper() {
return caseMap(0, Locale::getDefault().getName(), 0, TO_UPPER);
}
UnicodeString &
UnicodeString::toUpper(const Locale &locale) {
return caseMap(0, locale.getName(), 0, TO_UPPER);
}
#if !UCONFIG_NO_BREAK_ITERATION
UnicodeString &
UnicodeString::toTitle(BreakIterator *titleIter) {
return caseMap(titleIter, Locale::getDefault().getName(), 0, TO_TITLE);
}
UnicodeString &
UnicodeString::toTitle(BreakIterator *titleIter, const Locale &locale) {
return caseMap(titleIter, locale.getName(), 0, TO_TITLE);
}
UnicodeString &
UnicodeString::toTitle(BreakIterator *titleIter, const Locale &locale, uint32_t options) {
return caseMap(titleIter, locale.getName(), options, TO_TITLE);
}
#endif
UnicodeString &
UnicodeString::foldCase(uint32_t options) {
/* The Locale parameter isn't used. Use "" instead. */
return caseMap(0, "", options, FOLD_CASE);
}
U_NAMESPACE_END
// Defined here to reduce dependencies on break iterator
U_CAPI int32_t U_EXPORT2
uhash_hashCaselessUnicodeString(const UHashTok key) {
U_NAMESPACE_USE
const UnicodeString *str = (const UnicodeString*) key.pointer;
if (str == NULL) {
return 0;
}
// Inefficient; a better way would be to have a hash function in
// UnicodeString that does case folding on the fly.
UnicodeString copy(*str);
return copy.foldCase().hashCode();
}
// Defined here to reduce dependencies on break iterator
U_CAPI UBool U_EXPORT2
uhash_compareCaselessUnicodeString(const UHashTok key1, const UHashTok key2) {
U_NAMESPACE_USE
const UnicodeString *str1 = (const UnicodeString*) key1.pointer;
const UnicodeString *str2 = (const UnicodeString*) key2.pointer;
if (str1 == str2) {
return TRUE;
}
if (str1 == NULL || str2 == NULL) {
return FALSE;
}
return str1->caseCompare(*str2, U_FOLD_CASE_DEFAULT) == 0;
}
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