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/*
*******************************************************************************
*
* Copyright (C) 1999-2011, 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 "cstring.h"
#include "cmemory.h"
#include "unicode/ustring.h"
#include "unicode/unistr.h"
#include "unicode/uchar.h"
#include "uelement.h"
#include "ustr_imp.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;
if(srcStart!=0) {
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
//========================================
UnicodeString &
UnicodeString::caseMap(const UCaseMap *csm,
UStringCaseMapper *stringCaseMapper) {
if(isEmpty() || !isWritable()) {
// 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() 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 oldStackBuffer[US_STACKBUF_SIZE];
UChar *oldArray;
int32_t oldLength;
if(fFlags&kUsingStackBuffer) {
// copy the stack buffer contents because it will be overwritten
u_memcpy(oldStackBuffer, fUnion.fStackBuffer, fShortLength);
oldArray = oldStackBuffer;
oldLength = fShortLength;
} else {
oldArray = getArrayStart();
oldLength = length();
}
int32_t capacity;
if(oldLength <= US_STACKBUF_SIZE) {
capacity = US_STACKBUF_SIZE;
} else {
capacity = oldLength + 20;
}
int32_t *bufferToDelete = 0;
if(!cloneArrayIfNeeded(capacity, capacity, FALSE, &bufferToDelete, TRUE)) {
return *this;
}
// Case-map, and if the result is too long, then reallocate and repeat.
UErrorCode errorCode;
int32_t newLength;
do {
errorCode = U_ZERO_ERROR;
newLength = stringCaseMapper(csm, getArrayStart(), getCapacity(),
oldArray, oldLength, &errorCode);
setLength(newLength);
} while(errorCode==U_BUFFER_OVERFLOW_ERROR && cloneArrayIfNeeded(newLength, newLength, FALSE));
if (bufferToDelete) {
uprv_free(bufferToDelete);
}
if(U_FAILURE(errorCode)) {
setToBogus();
}
return *this;
}
UnicodeString &
UnicodeString::foldCase(uint32_t options) {
UCaseMap csm=UCASEMAP_INITIALIZER;
csm.csp=ucase_getSingleton();
csm.options=options;
return caseMap(&csm, ustrcase_internalFold);
}
U_NAMESPACE_END
// Defined here to reduce dependencies on break iterator
U_CAPI int32_t U_EXPORT2
uhash_hashCaselessUnicodeString(const UElement 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 UElement key1, const UElement 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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