251 lines
8.0 KiB
C++
251 lines
8.0 KiB
C++
// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*
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*******************************************************************************
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*
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* Copyright (C) 1999-2014, International Business Machines
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* Corporation and others. All Rights Reserved.
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*
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*******************************************************************************
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* file name: unistr_case.cpp
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* encoding: UTF-8
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* tab size: 8 (not used)
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* indentation:2
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*
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* created on: 2004aug19
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* created by: Markus W. Scherer
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*
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* Case-mapping functions moved here from unistr.cpp
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*/
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#include "unicode/utypes.h"
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#include "unicode/brkiter.h"
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#include "unicode/casemap.h"
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#include "unicode/edits.h"
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#include "unicode/putil.h"
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#include "cstring.h"
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#include "cmemory.h"
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#include "unicode/ustring.h"
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#include "unicode/unistr.h"
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#include "unicode/uchar.h"
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#include "uassert.h"
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#include "ucasemap_imp.h"
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#include "uelement.h"
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U_NAMESPACE_BEGIN
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//========================================
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// Read-only implementation
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//========================================
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int8_t
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UnicodeString::doCaseCompare(int32_t start,
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int32_t length,
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const char16_t *srcChars,
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int32_t srcStart,
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int32_t srcLength,
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uint32_t options) const
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{
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// compare illegal string values
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// treat const char16_t *srcChars==nullptr as an empty string
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if(isBogus()) {
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return -1;
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}
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// pin indices to legal values
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pinIndices(start, length);
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if(srcChars == nullptr) {
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srcStart = srcLength = 0;
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}
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// get the correct pointer
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const char16_t *chars = getArrayStart();
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chars += start;
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if(srcStart!=0) {
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srcChars += srcStart;
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}
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if(chars != srcChars) {
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UErrorCode errorCode=U_ZERO_ERROR;
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int32_t result=u_strcmpFold(chars, length, srcChars, srcLength,
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options|U_COMPARE_IGNORE_CASE, &errorCode);
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if(result!=0) {
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return (int8_t)(result >> 24 | 1);
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}
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} else {
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// get the srcLength if necessary
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if(srcLength < 0) {
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srcLength = u_strlen(srcChars + srcStart);
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}
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if(length != srcLength) {
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return (int8_t)((length - srcLength) >> 24 | 1);
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}
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}
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return 0;
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}
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//========================================
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// Write implementation
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//========================================
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UnicodeString &
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UnicodeString::caseMap(int32_t caseLocale, uint32_t options, UCASEMAP_BREAK_ITERATOR_PARAM
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UStringCaseMapper *stringCaseMapper) {
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if(isEmpty() || !isWritable()) {
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// nothing to do
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return *this;
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}
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char16_t oldBuffer[2 * US_STACKBUF_SIZE];
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char16_t *oldArray;
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int32_t oldLength = length();
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int32_t newLength;
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UBool writable = isBufferWritable();
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UErrorCode errorCode = U_ZERO_ERROR;
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#if !UCONFIG_NO_BREAK_ITERATION
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// Read-only alias to the original string contents for the titlecasing BreakIterator.
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// We cannot set the iterator simply to *this because *this is being modified.
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UnicodeString oldString;
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#endif
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// Try to avoid heap-allocating a new character array for this string.
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if (writable ? oldLength <= UPRV_LENGTHOF(oldBuffer) : oldLength < US_STACKBUF_SIZE) {
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// Short string: Copy the contents into a temporary buffer and
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// case-map back into the current array, or into the stack buffer.
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char16_t *buffer = getArrayStart();
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int32_t capacity;
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oldArray = oldBuffer;
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u_memcpy(oldBuffer, buffer, oldLength);
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if (writable) {
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capacity = getCapacity();
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} else {
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// Switch from the read-only alias or shared heap buffer to the stack buffer.
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if (!cloneArrayIfNeeded(US_STACKBUF_SIZE, US_STACKBUF_SIZE, /* doCopyArray= */ false)) {
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return *this;
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}
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U_ASSERT(fUnion.fFields.fLengthAndFlags & kUsingStackBuffer);
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buffer = fUnion.fStackFields.fBuffer;
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capacity = US_STACKBUF_SIZE;
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}
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#if !UCONFIG_NO_BREAK_ITERATION
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if (iter != nullptr) {
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oldString.setTo(false, oldArray, oldLength);
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iter->setText(oldString);
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}
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#endif
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newLength = stringCaseMapper(caseLocale, options, UCASEMAP_BREAK_ITERATOR
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buffer, capacity,
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oldArray, oldLength, nullptr, errorCode);
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if (U_SUCCESS(errorCode)) {
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setLength(newLength);
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return *this;
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} else if (errorCode == U_BUFFER_OVERFLOW_ERROR) {
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// common overflow handling below
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} else {
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setToBogus();
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return *this;
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}
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} else {
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// Longer string or read-only buffer:
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// Collect only changes and then apply them to this string.
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// Case mapping often changes only small parts of a string,
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// and often does not change its length.
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oldArray = getArrayStart();
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Edits edits;
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char16_t replacementChars[200];
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#if !UCONFIG_NO_BREAK_ITERATION
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if (iter != nullptr) {
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oldString.setTo(false, oldArray, oldLength);
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iter->setText(oldString);
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}
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#endif
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stringCaseMapper(caseLocale, options | U_OMIT_UNCHANGED_TEXT, UCASEMAP_BREAK_ITERATOR
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replacementChars, UPRV_LENGTHOF(replacementChars),
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oldArray, oldLength, &edits, errorCode);
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if (U_SUCCESS(errorCode)) {
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// Grow the buffer at most once, not for multiple doReplace() calls.
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newLength = oldLength + edits.lengthDelta();
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if (newLength > oldLength && !cloneArrayIfNeeded(newLength, newLength)) {
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return *this;
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}
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for (Edits::Iterator ei = edits.getCoarseChangesIterator(); ei.next(errorCode);) {
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doReplace(ei.destinationIndex(), ei.oldLength(),
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replacementChars, ei.replacementIndex(), ei.newLength());
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}
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if (U_FAILURE(errorCode)) {
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setToBogus();
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}
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return *this;
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} else if (errorCode == U_BUFFER_OVERFLOW_ERROR) {
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// common overflow handling below
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newLength = oldLength + edits.lengthDelta();
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} else {
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setToBogus();
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return *this;
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}
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}
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// Handle buffer overflow, newLength is known.
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// We need to allocate a new buffer for the internal string case mapping function.
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// This is very similar to how doReplace() keeps the old array pointer
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// and deletes the old array itself after it is done.
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// In addition, we are forcing cloneArrayIfNeeded() to always allocate a new array.
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int32_t *bufferToDelete = 0;
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if (!cloneArrayIfNeeded(newLength, newLength, false, &bufferToDelete, true)) {
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return *this;
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}
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errorCode = U_ZERO_ERROR;
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// No need to iter->setText() again: The case mapper restarts via iter->first().
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newLength = stringCaseMapper(caseLocale, options, UCASEMAP_BREAK_ITERATOR
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getArrayStart(), getCapacity(),
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oldArray, oldLength, nullptr, errorCode);
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if (bufferToDelete) {
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uprv_free(bufferToDelete);
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}
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if (U_SUCCESS(errorCode)) {
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setLength(newLength);
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} else {
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setToBogus();
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}
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return *this;
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}
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UnicodeString &
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UnicodeString::foldCase(uint32_t options) {
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return caseMap(UCASE_LOC_ROOT, options, UCASEMAP_BREAK_ITERATOR_NULL ustrcase_internalFold);
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}
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U_NAMESPACE_END
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// Defined here to reduce dependencies on break iterator
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U_CAPI int32_t U_EXPORT2
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uhash_hashCaselessUnicodeString(const UElement key) {
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U_NAMESPACE_USE
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const UnicodeString *str = (const UnicodeString*) key.pointer;
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if (str == nullptr) {
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return 0;
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}
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// Inefficient; a better way would be to have a hash function in
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// UnicodeString that does case folding on the fly.
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UnicodeString copy(*str);
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return copy.foldCase().hashCode();
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}
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// Defined here to reduce dependencies on break iterator
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U_CAPI UBool U_EXPORT2
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uhash_compareCaselessUnicodeString(const UElement key1, const UElement key2) {
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U_NAMESPACE_USE
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const UnicodeString *str1 = (const UnicodeString*) key1.pointer;
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const UnicodeString *str2 = (const UnicodeString*) key2.pointer;
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if (str1 == str2) {
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return true;
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}
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if (str1 == nullptr || str2 == nullptr) {
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return false;
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}
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return str1->caseCompare(*str2, U_FOLD_CASE_DEFAULT) == 0;
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}
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