633 lines
24 KiB
C++
633 lines
24 KiB
C++
/*
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********************************************************************************
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* Copyright (C) 1997-2004, 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 brkiter.h
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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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* 02/18/97 aliu Added typedef for TextCount. Made DONE const.
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* 05/07/97 aliu Fixed DLL declaration.
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* 07/09/97 jfitz Renamed BreakIterator and interface synced with JDK
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* 08/11/98 helena Sync-up JDK1.2.
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* 01/13/2000 helena Added UErrorCode parameter to createXXXInstance methods.
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********************************************************************************
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*/
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#ifndef BRKITER_H
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#define BRKITER_H
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#include "unicode/utypes.h"
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#if UCONFIG_NO_BREAK_ITERATION
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U_NAMESPACE_BEGIN
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/*
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* Allow the declaration of APIs with pointers to BreakIterator
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* even when break iteration is removed from the build.
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*/
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class BreakIterator;
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U_NAMESPACE_END
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#else
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#include "unicode/uobject.h"
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#include "unicode/unistr.h"
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#include "unicode/chariter.h"
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#include "unicode/locid.h"
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#include "unicode/ubrk.h"
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#include "unicode/strenum.h"
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U_NAMESPACE_BEGIN
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#if !UCONFIG_NO_SERVICE
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/**
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* Opaque type returned by registerInstance.
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* @stable
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*/
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typedef const void* URegistryKey;
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#endif
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/**
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* The BreakIterator class implements methods for finding the location
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* of boundaries in text. BreakIterator is an abstract base class.
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* Instances of BreakIterator maintain a current position and scan over
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* text returning the index of characters where boundaries occur.
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* <P>
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* Line boundary analysis determines where a text string can be broken
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* when line-wrapping. The mechanism correctly handles punctuation and
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* hyphenated words.
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* <P>
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* Sentence boundary analysis allows selection with correct
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* interpretation of periods within numbers and abbreviations, and
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* trailing punctuation marks such as quotation marks and parentheses.
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* <P>
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* Word boundary analysis is used by search and replace functions, as
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* well as within text editing applications that allow the user to
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* select words with a double click. Word selection provides correct
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* interpretation of punctuation marks within and following
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* words. Characters that are not part of a word, such as symbols or
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* punctuation marks, have word-breaks on both sides.
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* <P>
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* Character boundary analysis allows users to interact with
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* characters as they expect to, for example, when moving the cursor
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* through a text string. Character boundary analysis provides correct
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* navigation of through character strings, regardless of how the
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* character is stored. For example, an accented character might be
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* stored as a base character and a diacritical mark. What users
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* consider to be a character can differ between languages.
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* <P>
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* This is the interface for all text boundaries.
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* <P>
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* Examples:
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* <P>
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* Helper function to output text
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* <pre>
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* \code
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* void printTextRange( BreakIterator& iterator, int32_t start, int32_t end )
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* {
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* UnicodeString textBuffer, temp;
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* CharacterIterator *strIter = iterator.createText();
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* strIter->getText(temp);
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* cout << " " << start << " " << end << " |"
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* << temp.extractBetween(start, end, textBuffer)
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* << "|" << endl;
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* delete strIter;
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* }
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* \endcode
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* </pre>
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* Print each element in order:
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* <pre>
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* \code
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* void printEachForward( BreakIterator& boundary)
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* {
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* int32_t start = boundary.first();
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* for (int32_t end = boundary.next();
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* end != BreakIterator::DONE;
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* start = end, end = boundary.next())
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* {
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* printTextRange( boundary, start, end );
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* }
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* }
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* \code
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* </pre>
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* Print each element in reverse order:
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* <pre>
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* \code
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* void printEachBackward( BreakIterator& boundary)
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* {
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* int32_t end = boundary.last();
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* for (int32_t start = boundary.previous();
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* start != BreakIterator::DONE;
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* end = start, start = boundary.previous())
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* {
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* printTextRange( boundary, start, end );
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* }
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* }
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* \endcode
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* </pre>
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* Print first element
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* <pre>
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* \code
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* void printFirst(BreakIterator& boundary)
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* {
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* int32_t start = boundary.first();
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* int32_t end = boundary.next();
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* printTextRange( boundary, start, end );
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* }
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* \endcode
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* </pre>
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* Print last element
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* <pre>
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* \code
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* void printLast(BreakIterator& boundary)
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* {
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* int32_t end = boundary.last();
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* int32_t start = boundary.previous();
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* printTextRange( boundary, start, end );
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* }
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* \endcode
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* </pre>
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* Print the element at a specified position
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* <pre>
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* \code
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* void printAt(BreakIterator &boundary, int32_t pos )
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* {
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* int32_t end = boundary.following(pos);
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* int32_t start = boundary.previous();
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* printTextRange( boundary, start, end );
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* }
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* \endcode
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* </pre>
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* Creating and using text boundaries
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* <pre>
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* \code
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* void BreakIterator_Example( void )
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* {
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* BreakIterator* boundary;
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* UnicodeString stringToExamine("Aaa bbb ccc. Ddd eee fff.");
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* cout << "Examining: " << stringToExamine << endl;
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*
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* //print each sentence in forward and reverse order
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* boundary = BreakIterator::createSentenceInstance( Locale::US );
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* boundary->setText(stringToExamine);
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* cout << "----- forward: -----------" << endl;
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* printEachForward(*boundary);
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* cout << "----- backward: ----------" << endl;
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* printEachBackward(*boundary);
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* delete boundary;
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*
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* //print each word in order
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* boundary = BreakIterator::createWordInstance();
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* boundary->setText(stringToExamine);
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* cout << "----- forward: -----------" << endl;
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* printEachForward(*boundary);
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* //print first element
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* cout << "----- first: -------------" << endl;
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* printFirst(*boundary);
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* //print last element
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* cout << "----- last: --------------" << endl;
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* printLast(*boundary);
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* //print word at charpos 10
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* cout << "----- at pos 10: ---------" << endl;
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* printAt(*boundary, 10 );
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*
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* delete boundary;
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* }
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* \endcode
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* </pre>
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*/
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class U_COMMON_API BreakIterator : public UObject {
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public:
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/**
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* destructor
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* @stable ICU 2.0
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*/
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virtual ~BreakIterator();
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/**
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* Return true if another object is semantically equal to this
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* one. The other object should be an instance of the same subclass of
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* BreakIterator. Objects of different subclasses are considered
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* unequal.
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* <P>
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* Return true if this BreakIterator is at the same position in the
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* same text, and is the same class and type (word, line, etc.) of
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* BreakIterator, as the argument. Text is considered the same if
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* it contains the same characters, it need not be the same
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* object, and styles are not considered.
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* @stable ICU 2.0
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*/
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virtual UBool operator==(const BreakIterator&) const = 0;
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/**
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* Returns the complement of the result of operator==
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* @param rhs The BreakIterator to be compared for inequality
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* @return the complement of the result of operator==
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* @stable ICU 2.0
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*/
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UBool operator!=(const BreakIterator& rhs) const { return !operator==(rhs); }
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/**
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* Return a polymorphic copy of this object. This is an abstract
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* method which subclasses implement.
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* @stable ICU 2.0
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*/
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virtual BreakIterator* clone(void) const = 0;
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/**
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* Return a polymorphic class ID for this object. Different subclasses
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* will return distinct unequal values.
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* @stable ICU 2.0
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*/
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virtual UClassID getDynamicClassID(void) const = 0;
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/**
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* Return a CharacterIterator over the text being analyzed.
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* Changing the state of the returned iterator can have undefined consequences
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* on the operation of the break iterator. If you need to change it, clone it first.
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* @stable ICU 2.0
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*/
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virtual const CharacterIterator& getText(void) const = 0;
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/**
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* Change the text over which this operates. The text boundary is
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* reset to the start.
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* @param text The UnicodeString used to change the text.
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* @stable ICU 2.0
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*/
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virtual void setText(const UnicodeString &text) = 0;
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/**
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* Change the text over which this operates. The text boundary is
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* reset to the start.
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* @param it The CharacterIterator used to change the text.
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* @stable ICU 2.0
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*/
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virtual void adoptText(CharacterIterator* it) = 0;
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/**
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* DONE is returned by previous() and next() after all valid
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* boundaries have been returned.
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* @stable ICU 2.0
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*/
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#ifdef U_CYGWIN
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static U_COMMON_API const int32_t DONE;
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#else
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static const int32_t DONE;
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#endif
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/**
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* Return the index of the first character in the text being scanned.
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* @stable ICU 2.0
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*/
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virtual int32_t first(void) = 0;
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/**
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* Return the index immediately BEYOND the last character in the text being scanned.
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* @stable ICU 2.0
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*/
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virtual int32_t last(void) = 0;
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/**
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* Return the boundary preceding the current boundary.
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* @return The character index of the previous text boundary or DONE if all
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* boundaries have been returned.
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* @stable ICU 2.0
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*/
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virtual int32_t previous(void) = 0;
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/**
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* Return the boundary following the current boundary.
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* @return The character index of the next text boundary or DONE if all
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* boundaries have been returned.
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* @stable ICU 2.0
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*/
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virtual int32_t next(void) = 0;
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/**
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* Return character index of the current interator position within the text.
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* @return The boundary most recently returned.
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* @stable ICU 2.0
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*/
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virtual int32_t current(void) const = 0;
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/**
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* Return the first boundary following the specified offset.
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* The value returned is always greater than the offset or
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* the value BreakIterator.DONE
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* @param offset the offset to begin scanning.
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* @return The first boundary after the specified offset.
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* @stable ICU 2.0
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*/
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virtual int32_t following(int32_t offset) = 0;
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/**
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* Return the first boundary preceding the specified offset.
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* The value returned is always smaller than the offset or
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* the value BreakIterator.DONE
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* @param offset the offset to begin scanning.
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* @return The first boundary before the specified offset.
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* @stable ICU 2.0
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*/
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virtual int32_t preceding(int32_t offset) = 0;
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/**
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* Return true if the specfied position is a boundary position.
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* As a side effect, the current position of the iterator is set
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* to the first boundary position at or following the specified offset.
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* @param offset the offset to check.
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* @return True if "offset" is a boundary position.
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* @stable ICU 2.0
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*/
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virtual UBool isBoundary(int32_t offset) = 0;
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/**
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* Return the nth boundary from the current boundary
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* @param n which boundary to return. A value of 0
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* does nothing. Negative values move to previous boundaries
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* and positive values move to later boundaries.
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* @return The index of the nth boundary from the current position, or
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* DONE if there are fewer than |n| boundaries in the specfied direction.
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* @stable ICU 2.0
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*/
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virtual int32_t next(int32_t n) = 0;
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/**
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* Create BreakIterator for word-breaks using the given locale.
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* Returns an instance of a BreakIterator implementing word breaks.
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* WordBreak is useful for word selection (ex. double click)
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* @param where the locale.
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* @param status the error code
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* @return A BreakIterator for word-breaks. The UErrorCode& status
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* parameter is used to return status information to the user.
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* To check whether the construction succeeded or not, you should check
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* the value of U_SUCCESS(err). If you wish more detailed information, you
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* can check for informational error results which still indicate success.
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* U_USING_FALLBACK_WARNING indicates that a fall back locale was used. For
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* example, 'de_CH' was requested, but nothing was found there, so 'de' was
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* used. U_USING_DEFAULT_WARNING indicates that the default locale data was
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* used; neither the requested locale nor any of its fall back locales
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* could be found.
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* The caller owns the returned object and is responsible for deleting it.
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* @stable ICU 2.0
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*/
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static BreakIterator* U_EXPORT2
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createWordInstance(const Locale& where, UErrorCode& status);
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/**
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* Create BreakIterator for line-breaks using specified locale.
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* Returns an instance of a BreakIterator implementing line breaks. Line
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* breaks are logically possible line breaks, actual line breaks are
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* usually determined based on display width.
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* LineBreak is useful for word wrapping text.
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* @param where the locale.
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* @param status The error code.
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* @return A BreakIterator for line-breaks. The UErrorCode& status
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* parameter is used to return status information to the user.
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* To check whether the construction succeeded or not, you should check
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* the value of U_SUCCESS(err). If you wish more detailed information, you
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* can check for informational error results which still indicate success.
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* U_USING_FALLBACK_WARNING indicates that a fall back locale was used. For
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* example, 'de_CH' was requested, but nothing was found there, so 'de' was
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* used. U_USING_DEFAULT_WARNING indicates that the default locale data was
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* used; neither the requested locale nor any of its fall back locales
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* could be found.
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* The caller owns the returned object and is responsible for deleting it.
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* @stable ICU 2.0
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*/
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static BreakIterator* U_EXPORT2
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createLineInstance(const Locale& where, UErrorCode& status);
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/**
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* Create BreakIterator for character-breaks using specified locale
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* Returns an instance of a BreakIterator implementing character breaks.
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* Character breaks are boundaries of combining character sequences.
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* @param where the locale.
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* @param status The error code.
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* @return A BreakIterator for character-breaks. The UErrorCode& status
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* parameter is used to return status information to the user.
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* To check whether the construction succeeded or not, you should check
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* the value of U_SUCCESS(err). If you wish more detailed information, you
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* can check for informational error results which still indicate success.
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* U_USING_FALLBACK_WARNING indicates that a fall back locale was used. For
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* example, 'de_CH' was requested, but nothing was found there, so 'de' was
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* used. U_USING_DEFAULT_WARNING indicates that the default locale data was
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* used; neither the requested locale nor any of its fall back locales
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* could be found.
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* The caller owns the returned object and is responsible for deleting it.
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* @stable ICU 2.0
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*/
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static BreakIterator* U_EXPORT2
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createCharacterInstance(const Locale& where, UErrorCode& status);
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/**
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* Create BreakIterator for sentence-breaks using specified locale
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* Returns an instance of a BreakIterator implementing sentence breaks.
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* @param where the locale.
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* @param status The error code.
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* @return A BreakIterator for sentence-breaks. The UErrorCode& status
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* parameter is used to return status information to the user.
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* To check whether the construction succeeded or not, you should check
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* the value of U_SUCCESS(err). If you wish more detailed information, you
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* can check for informational error results which still indicate success.
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* U_USING_FALLBACK_WARNING indicates that a fall back locale was used. For
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* example, 'de_CH' was requested, but nothing was found there, so 'de' was
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* used. U_USING_DEFAULT_WARNING indicates that the default locale data was
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* used; neither the requested locale nor any of its fall back locales
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* could be found.
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* The caller owns the returned object and is responsible for deleting it.
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* @stable ICU 2.0
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*/
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static BreakIterator* U_EXPORT2
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createSentenceInstance(const Locale& where, UErrorCode& status);
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/**
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* Create BreakIterator for title-casing breaks using the specified locale
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* Returns an instance of a BreakIterator implementing title breaks.
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* The iterator returned locates title boundaries as described for
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* Unicode 3.2 only. For Unicode 4.0 and above title boundary iteration,
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* please use Word Boundary iterator.{@link #createWordInstance }
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*
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* @param where the locale.
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* @param status The error code.
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* @return A BreakIterator for title-breaks. The UErrorCode& status
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* parameter is used to return status information to the user.
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* To check whether the construction succeeded or not, you should check
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* the value of U_SUCCESS(err). If you wish more detailed information, you
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* can check for informational error results which still indicate success.
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* U_USING_FALLBACK_WARNING indicates that a fall back locale was used. For
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* example, 'de_CH' was requested, but nothing was found there, so 'de' was
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* used. U_USING_DEFAULT_WARNING indicates that the default locale data was
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* used; neither the requested locale nor any of its fall back locales
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* could be found.
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* The caller owns the returned object and is responsible for deleting it.
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* @stable ICU 2.1
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*/
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static BreakIterator* U_EXPORT2
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createTitleInstance(const Locale& where, UErrorCode& status);
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/**
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* Get the set of Locales for which TextBoundaries are installed.
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* <p><b>Note:</b> this will not return locales added through the register
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* call. To see the registered locales too, use the getAvailableLocales
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* function that returns a StringEnumeration object </p>
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* @param count the output parameter of number of elements in the locale list
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* @return available locales
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* @stable ICU 2.0
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*/
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static const Locale* U_EXPORT2 getAvailableLocales(int32_t& count);
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/**
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* Get name of the object for the desired Locale, in the desired langauge.
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* @param objectLocale must be from getAvailableLocales.
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* @param displayLocale specifies the desired locale for output.
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* @param name the fill-in parameter of the return value
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* Uses best match.
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* @return user-displayable name
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* @stable ICU 2.0
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*/
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static UnicodeString& U_EXPORT2 getDisplayName(const Locale& objectLocale,
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const Locale& displayLocale,
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UnicodeString& name);
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/**
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* Get name of the object for the desired Locale, in the langauge of the
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* default locale.
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* @param objectLocale must be from getMatchingLocales
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* @param name the fill-in parameter of the return value
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* @return user-displayable name
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* @stable ICU 2.0
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*/
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static UnicodeString& U_EXPORT2 getDisplayName(const Locale& objectLocale,
|
|
UnicodeString& name);
|
|
|
|
/**
|
|
* Thread safe client-buffer-based cloning operation
|
|
* Do NOT call delete on a safeclone, since 'new' is not used to create it.
|
|
* @param stackBuffer user allocated space for the new clone. If NULL new memory will be allocated.
|
|
* If buffer is not large enough, new memory will be allocated.
|
|
* @param BufferSize reference to size of allocated space.
|
|
* If BufferSize == 0, a sufficient size for use in cloning will
|
|
* be returned ('pre-flighting')
|
|
* If BufferSize is not enough for a stack-based safe clone,
|
|
* new memory will be allocated.
|
|
* @param status to indicate whether the operation went on smoothly or there were errors
|
|
* An informational status value, U_SAFECLONE_ALLOCATED_ERROR, is used if any allocations were
|
|
* necessary.
|
|
* @return pointer to the new clone
|
|
*
|
|
* @stable ICU 2.0
|
|
*/
|
|
virtual BreakIterator * createBufferClone(void *stackBuffer,
|
|
int32_t &BufferSize,
|
|
UErrorCode &status) = 0;
|
|
|
|
/**
|
|
* Determine whether the BreakIterator was created in user memory by
|
|
* createBufferClone(), and thus should not be deleted. Such objects
|
|
* must be closed by an explicit call to the destructor (not delete).
|
|
* @stable ICU 2.0
|
|
*/
|
|
inline UBool isBufferClone(void);
|
|
|
|
#if !UCONFIG_NO_SERVICE
|
|
/**
|
|
* Register a new break iterator of the indicated kind, to use in the given locale.
|
|
* The break iterator will be adopted. Clones of the iterator will be returned
|
|
* if a request for a break iterator of the given kind matches or falls back to
|
|
* this locale.
|
|
* @param toAdopt the BreakIterator instance to be adopted
|
|
* @param locale the Locale for which this instance is to be registered
|
|
* @param kind the type of iterator for which this instance is to be registered
|
|
* @param status the in/out status code, no special meanings are assigned
|
|
* @return a registry key that can be used to unregister this instance
|
|
* @stable ICU 2.4
|
|
*/
|
|
static URegistryKey U_EXPORT2 registerInstance(BreakIterator* toAdopt,
|
|
const Locale& locale,
|
|
UBreakIteratorType kind,
|
|
UErrorCode& status);
|
|
|
|
/**
|
|
* Unregister a previously-registered BreakIterator using the key returned from the
|
|
* register call. Key becomes invalid after a successful call and should not be used again.
|
|
* The BreakIterator corresponding to the key will be deleted.
|
|
* @param key the registry key returned by a previous call to registerInstance
|
|
* @param status the in/out status code, no special meanings are assigned
|
|
* @return TRUE if the iterator for the key was successfully unregistered
|
|
* @stable ICU 2.4
|
|
*/
|
|
static UBool U_EXPORT2 unregister(URegistryKey key, UErrorCode& status);
|
|
|
|
/**
|
|
* Return a StringEnumeration over the locales available at the time of the call,
|
|
* including registered locales.
|
|
* @return a StringEnumeration over the locales available at the time of the call
|
|
* @stable ICU 2.4
|
|
*/
|
|
static StringEnumeration* U_EXPORT2 getAvailableLocales(void);
|
|
#endif
|
|
|
|
/**
|
|
* Returns the locale for this break iterator. Two flavors are available: valid and
|
|
* actual locale.
|
|
* @draft ICU 2.8 likely to change in ICU 3.0, based on feedback
|
|
*/
|
|
Locale getLocale(ULocDataLocaleType type, UErrorCode& status) const;
|
|
|
|
/** Get the locale for this break iterator object. You can choose between valid and actual locale.
|
|
* @param type type of the locale we're looking for (valid or actual)
|
|
* @param status error code for the operation
|
|
* @return the locale
|
|
* @internal
|
|
*/
|
|
const char *getLocaleID(ULocDataLocaleType type, UErrorCode& status) const;
|
|
|
|
private:
|
|
static BreakIterator* buildInstance(const Locale& loc, const char *type, UBool dict, UErrorCode& status);
|
|
static BreakIterator* createInstance(const Locale& loc, UBreakIteratorType kind, UErrorCode& status);
|
|
static BreakIterator* makeInstance(const Locale& loc, int32_t kind, UErrorCode& status);
|
|
|
|
friend class ICUBreakIteratorFactory;
|
|
friend class ICUBreakIteratorService;
|
|
|
|
protected:
|
|
/** @internal */
|
|
BreakIterator();
|
|
/** @internal */
|
|
UBool fBufferClone;
|
|
/** @internal */
|
|
BreakIterator (const BreakIterator &other) : UObject(other), fBufferClone(FALSE) {}
|
|
|
|
private:
|
|
|
|
/** @internal */
|
|
char actualLocale[ULOC_FULLNAME_CAPACITY];
|
|
char validLocale[ULOC_FULLNAME_CAPACITY];
|
|
|
|
/**
|
|
* The assignment operator has no real implementation.
|
|
* It's provided to make the compiler happy. Do not call.
|
|
*/
|
|
BreakIterator& operator=(const BreakIterator&) { return *this; }
|
|
};
|
|
|
|
inline UBool BreakIterator::isBufferClone()
|
|
{
|
|
return fBufferClone;
|
|
}
|
|
|
|
U_NAMESPACE_END
|
|
|
|
#endif /* #if !UCONFIG_NO_BREAK_ITERATION */
|
|
|
|
#endif // _BRKITER
|
|
//eof
|
|
|