701 lines
20 KiB
C++
701 lines
20 KiB
C++
/*
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*******************************************************************************
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* Copyright (C) 1996-1999, International Business Machines Corporation and *
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* others. All Rights Reserved. *
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*******************************************************************************
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*/
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/*
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* File coleitr.cpp
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*
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*
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*
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* Created by: Helena Shih
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*
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* Modification History:
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*
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* Date Name Description
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*
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* 6/23/97 helena Adding comments to make code more readable.
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* 08/03/98 erm Synched with 1.2 version of CollationElementIterator.java
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* 12/10/99 aliu Ported Thai collation support from Java.
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* 01/25/01 swquek Modified to a C++ wrapper calling C APIs (ucoliter.h)
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* 02/19/01 swquek Removed CollationElementsIterator() since it is
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* private constructor and no calls are made to it
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*/
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// #include "unicode/sortkey.h"
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#include "unicode/coleitr.h"
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#include "ucolimp.h"
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#include "cmemory.h"
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// #include "unicode/chariter.h"
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// #include "tables.h"
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// #include "unicode/normlzr.h"
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// #include "unicode/unicode.h"
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// #include "tcoldata.h"
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// #include "ucmp32.h"
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/* Constants --------------------------------------------------------------- */
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/* synwee : public can't remove */
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int32_t const CollationElementIterator::NULLORDER = 0xffffffff;
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// int32_t const CollationElementIterator::UNMAPPEDCHARVALUE = 0x7fff0000;
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// int32_t const CollationElementIterator::NO_MORE_CES = 0x00010101;
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/* CollationElementIterator public constructor/destructor ------------------ */
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CollationElementIterator::CollationElementIterator(
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const CollationElementIterator& other)
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: isDataOwned_(TRUE)
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{
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*this = other;
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}
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CollationElementIterator::~CollationElementIterator()
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{
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if (isDataOwned_)
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ucol_closeElements(m_data_);
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}
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/* CollationElementIterator public methods --------------------------------- */
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UTextOffset CollationElementIterator::getOffset() const
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{
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return ucol_getOffset(m_data_);
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}
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/**
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* Get the ordering priority of the next character in the string.
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* @return the next character's ordering. Returns NULLORDER if an error has
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* occured or if the end of string has been reached
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*/
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int32_t CollationElementIterator::next(UErrorCode& status)
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{
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/*
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if (text == NULL || U_FAILURE(status))
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return NULLORDER;
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// Update the decomposition mode if necessary.
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text->setMode(orderAlias->getDecomposition());
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if (bufferAlias != NULL)
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{
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// bufferAlias needs a bit of an explanation.
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// When we hit an expanding character in the text, we call the order's
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// getExpandValues method to retrieve an array of the orderings for all of
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// the characters in the expansion (see the end of this method).
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// The first ordering is returned, and an alias to the orderings array is
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// saved so that the remaining orderings can be returned on subsequent calls
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// to next. So, if the expanding buffer is not exhausted, all we have to do
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// here is return the next ordering in the buffer.
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if (expIndex < bufferAlias->size())
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return strengthOrder(bufferAlias->at(expIndex++));
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else
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bufferAlias = NULL;
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}
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// Gets the next character from the string using decomposition iterator.
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UChar32 ch = text->current();
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text->next();
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if (U_FAILURE(status))
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return NULLORDER;
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if (ch == Normalizer::DONE)
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return NULLORDER;
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// Ask the collator for this character's ordering.
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// Used to be RuleBasedCollator.getUnicodeOrder().
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// It can't be inlined in tblcoll.h file unfortunately.
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int32_t value = ucmp32_get(orderAlias->data->mapping, ch);
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if (value == RuleBasedCollator::UNMAPPED)
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{
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// Returned an "unmapped" flag and save the character so it can be
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// returned next time this method is called.
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if (ch == 0x0000)
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return ch;
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// \u0000 is not valid in C++'s UnicodeString
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ownBuffer->at(0) = UNMAPPEDCHARVALUE;
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ownBuffer->at(1) = ch << 16;
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bufferAlias = ownBuffer;
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}
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else
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{
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if (value >= RuleBasedCollator::CONTRACTCHARINDEX)
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value = nextContractChar(ch, status);
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if (value >= RuleBasedCollator::EXPANDCHARINDEX)
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bufferAlias = orderAlias->getExpandValueList(value);
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if (isThaiPreVowel(ch))
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{
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UChar32 consonant = text->current();
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text->next();
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if (isThaiBaseConsonant(consonant))
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bufferAlias = makeReorderedBuffer((UChar)consonant, value, bufferAlias,
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TRUE, status);
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else
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text->previous();
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}
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}
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if (bufferAlias != NULL)
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{
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expIndex = 1;
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value = bufferAlias->at(0);
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}
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return strengthOrder(value);
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*/
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return ucol_next(m_data_, &status);
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}
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UBool CollationElementIterator::operator!=(
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const CollationElementIterator& other) const
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{
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return !(*this == other);
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}
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UBool CollationElementIterator::operator==(
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const CollationElementIterator& that) const
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{
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if (this == &that)
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return TRUE;
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/*
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if (*text != *(that.text))
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return FALSE;
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if (((bufferAlias == NULL) != (that.bufferAlias == NULL)) ||
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(bufferAlias != NULL && *bufferAlias != *(that.bufferAlias)))
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return FALSE;
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if (expIndex != that.expIndex)
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return FALSE;
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if (orderAlias != that.orderAlias)
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return FALSE;
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return TRUE;
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*/
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return m_data_ == that.m_data_;
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}
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/**
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* Get the ordering priority of the previous collation element in the string.
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* @param status the error code status.
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* @return the previous element's ordering. Returns NULLORDER if an error has
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* occured or if the start of string has been reached.
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*/
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int32_t CollationElementIterator::previous(UErrorCode& status)
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{
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/*
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if (text == NULL || U_FAILURE(status))
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return NULLORDER;
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text->setMode(orderAlias->getDecomposition());
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if (bufferAlias != NULL)
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{
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if (expIndex > 0)
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return strengthOrder(bufferAlias->at(--expIndex));
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bufferAlias = NULL;
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}
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UChar32 ch = text->previous();
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if (ch == Normalizer::DONE)
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return NULLORDER;
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// Used to be RuleBasedCollator.getUnicodeOrder(). It can't be inlined in
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// tblcoll.h file unfortunately.
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int32_t value = ucmp32_get(orderAlias->data->mapping, ch);
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if (value == RuleBasedCollator::UNMAPPED)
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{
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if (ch == 0x0000)
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return ch;
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ownBuffer->at(0) = UNMAPPEDCHARVALUE;
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ownBuffer->at(1) = ch << 16;
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bufferAlias = ownBuffer;
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}
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else
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{
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if (value >= RuleBasedCollator::CONTRACTCHARINDEX)
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value = prevContractChar(ch, status);
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if (value >= RuleBasedCollator::EXPANDCHARINDEX)
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bufferAlias = orderAlias->getExpandValueList(value);
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if (isThaiBaseConsonant(ch))
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{
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UChar32 vowel = text->previous();
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if (isThaiPreVowel(vowel))
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bufferAlias = makeReorderedBuffer((UChar)vowel, value, bufferAlias,
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FALSE, status);
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else
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text->next();
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}
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}
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if (bufferAlias != NULL)
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{
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expIndex = bufferAlias->size()-1;
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value = bufferAlias->at(expIndex);
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}
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return strengthOrder(value);
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*/
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return ucol_previous(m_data_, &status);
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}
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/**
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* Resets the cursor to the beginning of the string.
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*/
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void CollationElementIterator::reset()
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{
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/*
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if (text != NULL)
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{
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text->reset();
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text->setMode(orderAlias->getDecomposition());
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}
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bufferAlias = NULL;
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expIndex = 0;
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*/
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ucol_reset(m_data_);
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}
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void CollationElementIterator::setOffset(UTextOffset newOffset,
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UErrorCode& status)
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{
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/*
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if (U_FAILURE(status))
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return;
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if (text != NULL)
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text->setIndex(newOffset);
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bufferAlias = NULL;
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*/
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ucol_setOffset(m_data_, newOffset, &status);
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}
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/**
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* Sets the source to the new source string.
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*/
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void CollationElementIterator::setText(const UnicodeString& source,
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UErrorCode& status)
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{
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if (U_FAILURE(status))
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return;
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/*
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bufferAlias = 0;
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if (text == NULL)
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text = new Normalizer(source, orderAlias->getDecomposition());
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else
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{
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text->setText(source, status);
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text->setMode(orderAlias->getDecomposition());
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}
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*/
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int32_t length = source.length();
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UChar *string = new UChar[length];
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source.extract(0, length, string);
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m_data_->length_ = length;
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if (m_data_->iteratordata_.isWritable &&
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m_data_->iteratordata_.string != NULL)
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uprv_free(m_data_->iteratordata_.string);
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init_collIterate(string, length, &m_data_->iteratordata_, TRUE);
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}
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// Sets the source to the new character iterator.
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void CollationElementIterator::setText(CharacterIterator& source,
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UErrorCode& status)
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{
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if (U_FAILURE(status))
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return;
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/*
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bufferAlias = 0;
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if (text == NULL)
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text = new Normalizer(source, orderAlias->getDecomposition());
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else
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{
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text->setMode(orderAlias->getDecomposition());
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text->setText(source, status);
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}
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*/
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int32_t length = source.getLength();
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UChar *buffer = new UChar[length];
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/*
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Using this constructor will prevent buffer from being removed when
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string gets removed
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*/
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UnicodeString string;
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source.getText(string);
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string.extract(0, length, buffer);
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m_data_->length_ = length;
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if (m_data_->iteratordata_.isWritable &&
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m_data_->iteratordata_.string != NULL)
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uprv_free(m_data_->iteratordata_.string);
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init_collIterate(buffer, length, &m_data_->iteratordata_, TRUE);
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}
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int32_t CollationElementIterator::strengthOrder(int32_t order) const
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{
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UCollationStrength s = ucol_getStrength(m_data_->collator_);
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// Mask off the unwanted differences.
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if (s == UCOL_PRIMARY)
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order &= RuleBasedCollator::PRIMARYDIFFERENCEONLY;
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else
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if (s == UCOL_SECONDARY)
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order &= RuleBasedCollator::SECONDARYDIFFERENCEONLY;
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return order;
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}
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/* CollationElementIterator private constructors/destructors --------------- */
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/*
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This private method will never be called, but it makes the linker happy
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CollationElementIterator::CollationElementIterator() : m_data_(0)
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{
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}
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*/
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CollationElementIterator::CollationElementIterator(
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const RuleBasedCollator* order)
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: isDataOwned_(TRUE)
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{
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UErrorCode status = U_ZERO_ERROR;
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m_data_ = ucol_openElements(order->ucollator, NULL, 0, &status);
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}
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/**
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* This is the "real" constructor for this class; it constructs an iterator
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* over the source text using the specified collator
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*/
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CollationElementIterator::CollationElementIterator(
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const UnicodeString& sourceText,
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const RuleBasedCollator* order,
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UErrorCode& status)
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: isDataOwned_(TRUE)
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{
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if (U_FAILURE(status))
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return;
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/*
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if ( sourceText.length() != 0 )
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{
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// A CollationElementIterator is really a two-layered beast.
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// Internally it uses a Normalizer to munge the source text into a form
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// where all "composed" Unicode characters (such as <20>) are split into a
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// normal character and a combining accent character.
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// Afterward, CollationElementIterator does its own processing to handle
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// expanding and contracting collation sequences, ignorables, and so on.
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Normalizer::EMode decomp = (order->getStrength() == Collator::IDENTICAL)
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? Normalizer::NO_OP : order->getDecomposition();
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text = new Normalizer(sourceText, decomp);
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if (text == NULL)
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status = U_MEMORY_ALLOCATION_ERROR;
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}
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*/
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int32_t length = sourceText.length();
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UChar *string = new UChar[length];
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/*
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Using this constructor will prevent buffer from being removed when
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string gets removed
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*/
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sourceText.extract(0, length, string);
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m_data_ = ucol_openElements(order->ucollator, string, length, &status);
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m_data_->iteratordata_.isWritable = TRUE;
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}
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/**
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* This is the "real" constructor for this class; it constructs an iterator over
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* the source text using the specified collator
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*/
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CollationElementIterator::CollationElementIterator(
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const CharacterIterator& sourceText,
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const RuleBasedCollator* order,
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UErrorCode& status)
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: isDataOwned_(TRUE)
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{
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if (U_FAILURE(status))
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return;
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// **** should I just drop this test? ****
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/*
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if ( sourceText.endIndex() != 0 )
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{
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// A CollationElementIterator is really a two-layered beast.
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// Internally it uses a Normalizer to munge the source text into a form
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// where all "composed" Unicode characters (such as <20>) are split into a
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// normal character and a combining accent character.
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// Afterward, CollationElementIterator does its own processing to handle
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// expanding and contracting collation sequences, ignorables, and so on.
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Normalizer::EMode decomp = order->getStrength() == Collator::IDENTICAL
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? Normalizer::NO_OP : order->getDecomposition();
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text = new Normalizer(sourceText, decomp);
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if (text == NULL)
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status = U_MEMORY_ALLOCATION_ERROR;
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}
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*/
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int32_t length = sourceText.getLength();
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UChar *buffer = new UChar[length];
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/*
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Using this constructor will prevent buffer from being removed when
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string gets removed
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*/
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UnicodeString string(buffer, length, length);
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((CharacterIterator &)sourceText).getText(string);
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string.extract(0, length, buffer);
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m_data_ = ucol_openElements(order->ucollator, buffer, length, &status);
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m_data_->iteratordata_.isWritable = TRUE;
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}
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/* CollationElementIterator private methods -------------------------------- */
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const CollationElementIterator& CollationElementIterator::operator=(
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const CollationElementIterator& other)
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{
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if (this != &other)
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{
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/*
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expIndex = other.expIndex;
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delete text;
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text = (Normalizer*)other.text->clone();
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if (other.bufferAlias == other.ownBuffer)
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{
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*ownBuffer = *other.ownBuffer;
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bufferAlias = ownBuffer;
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}
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else
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if (other.bufferAlias != NULL && other.bufferAlias == other.reorderBuffer)
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{
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if (reorderBuffer == NULL)
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reorderBuffer = new VectorOfInt(*other.reorderBuffer);
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else
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*reorderBuffer = *other.reorderBuffer;
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bufferAlias = reorderBuffer;
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}
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else
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bufferAlias = other.bufferAlias;
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orderAlias = other.orderAlias;
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*/
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this->m_data_ = other.m_data_;
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this->isDataOwned_ = FALSE;
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}
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return *this;
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}
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/**
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* Get the ordering priority of the next contracting character in the
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* string.
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* @param ch the starting character of a contracting character token
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* @return the next contracting character's ordering. Returns NULLORDER
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* if the end of string is reached.
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*/
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/*
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synwee : removed
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int32_t
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CollationElementIterator::nextContractChar(UChar32 ch,
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UErrorCode& status)
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{
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// First get the ordering of this single character
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VectorOfPToContractElement *list = orderAlias->getContractValues((UChar)ch);
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EntryPair *pair = (EntryPair *)list->at(0);
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int32_t order = pair->value;
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// Now iterate through the chars following it and
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// look for the longest match
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key.remove();
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key += ch;
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while ((ch = text->current()) != Normalizer::DONE)
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{
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if (U_FAILURE(status))
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{
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return NULLORDER;
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}
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key += ch;
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int32_t n = RuleBasedCollator::getEntry(list, key, TRUE);
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if (n == RuleBasedCollator::UNMAPPED)
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{
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break;
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}
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text->next();
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pair = (EntryPair *)list->at(n);
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order = pair->value;
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}
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return order;
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}
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*/
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/**
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* Get the ordering priority of the previous contracting character in the
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* string.
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* @param ch the starting character of a contracting character token
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* @return the next contracting character's ordering. Returns NULLORDER
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* if the end of string is reached.
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*/
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/* synwee : removed
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int32_t CollationElementIterator::prevContractChar(UChar32 ch,
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UErrorCode &status)
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{
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// First get the ordering of this single character
|
||
VectorOfPToContractElement *list = orderAlias->getContractValues((UChar)ch);
|
||
EntryPair *pair = (EntryPair *)list->at(0);
|
||
int32_t order = pair->value;
|
||
|
||
// Now iterate through the chars following it and
|
||
// look for the longest match
|
||
key.remove();
|
||
key += ch;
|
||
|
||
while ((ch = text->previous()) != Normalizer::DONE)
|
||
{
|
||
key += ch;
|
||
|
||
int32_t n = RuleBasedCollator::getEntry(list, key, FALSE);
|
||
|
||
if (n == RuleBasedCollator::UNMAPPED)
|
||
{
|
||
ch = text->next();
|
||
|
||
if (U_FAILURE(status))
|
||
{
|
||
return NULLORDER;
|
||
}
|
||
|
||
break;
|
||
}
|
||
|
||
pair = (EntryPair *)list->at(n);
|
||
order = pair->value;
|
||
}
|
||
|
||
return order;
|
||
}
|
||
*/
|
||
|
||
/**
|
||
* This method produces a buffer which contains the collation
|
||
* elements for the two characters, with colFirst's values preceding
|
||
* another character's. Presumably, the other character precedes colFirst
|
||
* in logical
|
||
* order (otherwise you wouldn't need this method would you?).
|
||
* The assumption is that the other char's value(s) have already been
|
||
* computed. If this char has a single element it is passed to this
|
||
* method as lastValue, and lastExpasion is null. If it has an
|
||
* expasion it is passed in lastExpansion, and colLastValue is ignored.
|
||
* This method may return the ownBuffer array as its value so ownBuffer
|
||
* had better not be in use anywhere else.
|
||
*/
|
||
/*
|
||
VectorOfInt* CollationElementIterator::makeReorderedBuffer(UChar colFirst,
|
||
int32_t lastValue,
|
||
VectorOfInt* lastExpansion,
|
||
UBool forward,
|
||
UErrorCode& status) {
|
||
|
||
VectorOfInt* result;
|
||
|
||
int32_t firstValue = ucmp32_get(orderAlias->data->mapping, colFirst);
|
||
if (firstValue >= RuleBasedCollator::CONTRACTCHARINDEX) {
|
||
firstValue = forward ? nextContractChar(colFirst, status)
|
||
: prevContractChar(colFirst, status);
|
||
}
|
||
|
||
VectorOfInt* firstExpansion = NULL;
|
||
if (firstValue >= RuleBasedCollator::EXPANDCHARINDEX) {
|
||
firstExpansion = orderAlias->getExpandValueList(firstValue);
|
||
}
|
||
|
||
if (!forward) {
|
||
int32_t temp1 = firstValue;
|
||
firstValue = lastValue;
|
||
lastValue = temp1;
|
||
VectorOfInt* temp2 = firstExpansion;
|
||
firstExpansion = lastExpansion;
|
||
lastExpansion = temp2;
|
||
}
|
||
|
||
if (firstExpansion == NULL && lastExpansion == NULL) {
|
||
ownBuffer->at(0) = firstValue;
|
||
ownBuffer->at(1) = lastValue;
|
||
result = ownBuffer;
|
||
}
|
||
else {
|
||
int32_t firstLength = firstExpansion==NULL? 1 : firstExpansion->size();
|
||
int32_t lastLength = lastExpansion==NULL? 1 : lastExpansion->size();
|
||
if (reorderBuffer == NULL) {
|
||
reorderBuffer = new VectorOfInt(firstLength+lastLength);
|
||
}
|
||
// reorderdBuffer gets reused for the life of this object.
|
||
// Since its internal buffer only grows, there is a danger
|
||
// that it will get really, really big, and never shrink. If
|
||
// this is actually happening, insert code here to check for
|
||
// the condition. Something along the lines of:
|
||
//! else if (reorderBuffer->size() >= 256 &&
|
||
//! (firstLength+lastLength) < 16) {
|
||
//! delete reorderBuffer;
|
||
//! reorderBuffer = new VectorOfInt(firstLength+lastLength);
|
||
//! }
|
||
// The specific numeric values need to be determined
|
||
// empirically. [aliu]
|
||
result = reorderBuffer;
|
||
|
||
if (firstExpansion == NULL) {
|
||
result->atPut(0, firstValue);
|
||
}
|
||
else {
|
||
// System.arraycopy(firstExpansion, 0, result, 0, firstLength);
|
||
*result = *firstExpansion;
|
||
}
|
||
|
||
if (lastExpansion == NULL) {
|
||
result->atPut(firstLength, lastValue);
|
||
}
|
||
else {
|
||
// System.arraycopy(lastExpansion, 0, result, firstLength, lastLength);
|
||
for (int32_t i=0; i<lastLength; ++i) {
|
||
result->atPut(firstLength + i, lastExpansion->at(i));
|
||
}
|
||
}
|
||
result->setSize(firstLength+lastLength);
|
||
}
|
||
|
||
return result;
|
||
}
|
||
*/
|