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671 lines
28 KiB
671 lines
28 KiB
// © 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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* Copyright (C) 1997-2016, 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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/**
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* \file
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* \brief C++ API: Break Iterator.
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*/
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#include "unicode/utypes.h"
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#if U_SHOW_CPLUSPLUS_API
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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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#include "unicode/utext.h"
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#include "unicode/umisc.h"
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U_NAMESPACE_BEGIN
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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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* The text boundary positions are found according to the rules
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* described in Unicode Standard Annex #29, Text Boundaries, and
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* Unicode Standard Annex #14, Line Breaking Properties. These
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* are available at http://www.unicode.org/reports/tr14/ and
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* http://www.unicode.org/reports/tr29/.
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* <p>
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* In addition to the C++ API defined in this header file, a
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* plain C API with equivalent functionality is defined in the
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* file ubrk.h
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* <p>
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* Code snippets illustrating the use of the Break Iterator APIs
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* are available in the ICU User Guide,
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* http://icu-project.org/userguide/boundaryAnalysis.html
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* and in the sample program icu/source/samples/break/break.cpp
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*
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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() 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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* @stable ICU 2.0
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*/
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virtual CharacterIterator& getText(void) const = 0;
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/**
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* Get a UText for the text being analyzed.
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* The returned UText is a shallow clone of the UText used internally
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* by the break iterator implementation. It can safely be used to
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* access the text without impacting any break iterator operations,
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* but the underlying text itself must not be altered.
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*
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* @param fillIn A UText to be filled in. If NULL, a new UText will be
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* allocated to hold the result.
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* @param status receives any error codes.
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* @return The current UText for this break iterator. If an input
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* UText was provided, it will always be returned.
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* @stable ICU 3.4
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*/
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virtual UText *getUText(UText *fillIn, UErrorCode &status) 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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*
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* The BreakIterator will retain a reference to the supplied string.
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* The caller must not modify or delete the text while the BreakIterator
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* retains the reference.
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*
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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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* Reset the break iterator to operate over the text represented by
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* the UText. The iterator position is reset to the start.
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*
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* This function makes a shallow clone of the supplied UText. This means
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* that the caller is free to immediately close or otherwise reuse the
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* Utext that was passed as a parameter, but that the underlying text itself
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* must not be altered while being referenced by the break iterator.
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*
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* All index positions returned by break iterator functions are
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* native indices from the UText. For example, when breaking UTF-8
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* encoded text, the break positions returned by next(), previous(), etc.
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* will be UTF-8 string indices, not UTF-16 positions.
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*
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* @param text The UText used to change the text.
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* @param status receives any error codes.
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* @stable ICU 3.4
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*/
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virtual void setText(UText *text, UErrorCode &status) = 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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* Note that setText(UText *) provides similar functionality to this function,
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* and is more efficient.
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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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enum {
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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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DONE = (int32_t)-1
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};
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/**
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* Sets the current iteration position to the beginning of the text, position zero.
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* @return The offset of the beginning of the text, zero.
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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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* Set the iterator position to the index immediately BEYOND the last character in the text being scanned.
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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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* Set the iterator position to 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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* Advance the iterator to 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 iterator 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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* Advance the iterator to 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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* Set the iterator position to 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 specified 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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* Set the iterator position to the nth boundary from the current boundary
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* @param n the number of boundaries to move by. 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 new iterator position, or
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* DONE if there are fewer than |n| boundaries in the specified 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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* For RuleBasedBreakIterators, return the status tag from the break rule
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* that determined the boundary at the current iteration position.
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* <p>
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* For break iterator types that do not support a rule status,
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* a default value of 0 is returned.
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* <p>
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* @return the status from the break rule that determined the boundary at
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* the current iteration position.
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* @see RuleBaseBreakIterator::getRuleStatus()
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* @see UWordBreak
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* @stable ICU 52
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*/
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virtual int32_t getRuleStatus() const;
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/**
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* For RuleBasedBreakIterators, get the status (tag) values from the break rule(s)
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* that determined the boundary at the current iteration position.
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* <p>
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* For break iterator types that do not support rule status,
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* no values are returned.
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* <p>
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* The returned status value(s) are stored into an array provided by the caller.
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* The values are stored in sorted (ascending) order.
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* If the capacity of the output array is insufficient to hold the data,
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* the output will be truncated to the available length, and a
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* U_BUFFER_OVERFLOW_ERROR will be signaled.
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* <p>
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* @see RuleBaseBreakIterator::getRuleStatusVec
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*
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* @param fillInVec an array to be filled in with the status values.
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* @param capacity the length of the supplied vector. A length of zero causes
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* the function to return the number of status values, in the
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* normal way, without attempting to store any values.
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* @param status receives error codes.
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* @return The number of rule status values from rules that determined
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* the boundary at the current iteration position.
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* In the event of a U_BUFFER_OVERFLOW_ERROR, the return value
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* is the total number of status values that were available,
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* not the reduced number that were actually returned.
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* @see getRuleStatus
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* @stable ICU 52
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*/
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virtual int32_t getRuleStatusVec(int32_t *fillInVec, int32_t capacity, UErrorCode &status);
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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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#ifndef U_HIDE_DEPRECATED_API
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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 a word boundary iterator. See {@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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* @deprecated ICU 64 Use createWordInstance instead.
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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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#endif /* U_HIDE_DEPRECATED_API */
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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 language.
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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,
|
|
const Locale& displayLocale,
|
|
UnicodeString& name);
|
|
|
|
/**
|
|
* Get name of the object for the desired Locale, in the language of the
|
|
* default locale.
|
|
* @param objectLocale must be from getMatchingLocales
|
|
* @param name the fill-in parameter of the return value
|
|
* @return user-displayable name
|
|
* @stable ICU 2.0
|
|
*/
|
|
static UnicodeString& U_EXPORT2 getDisplayName(const Locale& objectLocale,
|
|
UnicodeString& name);
|
|
|
|
#ifndef U_FORCE_HIDE_DEPRECATED_API
|
|
/**
|
|
* Deprecated functionality. Use clone() instead.
|
|
*
|
|
* 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
|
|
*
|
|
* @deprecated ICU 52. Use clone() instead.
|
|
*/
|
|
virtual BreakIterator * createBufferClone(void *stackBuffer,
|
|
int32_t &BufferSize,
|
|
UErrorCode &status) = 0;
|
|
#endif // U_FORCE_HIDE_DEPRECATED_API
|
|
|
|
#ifndef U_HIDE_DEPRECATED_API
|
|
|
|
/**
|
|
* 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).
|
|
* @deprecated ICU 52. Always delete the BreakIterator.
|
|
*/
|
|
inline UBool isBufferClone(void);
|
|
|
|
#endif /* U_HIDE_DEPRECATED_API */
|
|
|
|
#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.
|
|
* Because ICU may choose to cache BreakIterators internally, this must
|
|
* be called at application startup, prior to any calls to
|
|
* BreakIterator::createXXXInstance to avoid undefined behavior.
|
|
* @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.
|
|
* Because ICU may choose to cache BreakIterators internally, this should
|
|
* be called during application shutdown, after all calls to
|
|
* BreakIterator::createXXXInstance to avoid undefined behavior.
|
|
* @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.
|
|
* @stable ICU 2.8
|
|
*/
|
|
Locale getLocale(ULocDataLocaleType type, UErrorCode& status) const;
|
|
|
|
#ifndef U_HIDE_INTERNAL_API
|
|
/** 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;
|
|
#endif /* U_HIDE_INTERNAL_API */
|
|
|
|
/**
|
|
* Set the subject text string upon which the break iterator is operating
|
|
* without changing any other aspect of the matching state.
|
|
* The new and previous text strings must have the same content.
|
|
*
|
|
* This function is intended for use in environments where ICU is operating on
|
|
* strings that may move around in memory. It provides a mechanism for notifying
|
|
* ICU that the string has been relocated, and providing a new UText to access the
|
|
* string in its new position.
|
|
*
|
|
* Note that the break iterator implementation never copies the underlying text
|
|
* of a string being processed, but always operates directly on the original text
|
|
* provided by the user. Refreshing simply drops the references to the old text
|
|
* and replaces them with references to the new.
|
|
*
|
|
* Caution: this function is normally used only by very specialized,
|
|
* system-level code. One example use case is with garbage collection that moves
|
|
* the text in memory.
|
|
*
|
|
* @param input The new (moved) text string.
|
|
* @param status Receives errors detected by this function.
|
|
* @return *this
|
|
*
|
|
* @stable ICU 49
|
|
*/
|
|
virtual BreakIterator &refreshInputText(UText *input, UErrorCode &status) = 0;
|
|
|
|
private:
|
|
static BreakIterator* buildInstance(const Locale& loc, const char *type, UErrorCode& status);
|
|
static BreakIterator* createInstance(const Locale& loc, int32_t kind, UErrorCode& status);
|
|
static BreakIterator* makeInstance(const Locale& loc, int32_t kind, UErrorCode& status);
|
|
|
|
friend class ICUBreakIteratorFactory;
|
|
friend class ICUBreakIteratorService;
|
|
|
|
protected:
|
|
// Do not enclose protected default/copy constructors with #ifndef U_HIDE_INTERNAL_API
|
|
// or else the compiler will create a public ones.
|
|
/** @internal */
|
|
BreakIterator();
|
|
/** @internal */
|
|
BreakIterator (const BreakIterator &other);
|
|
#ifndef U_HIDE_INTERNAL_API
|
|
/** @internal */
|
|
BreakIterator (const Locale& valid, const Locale &actual);
|
|
/** @internal. Assignment Operator, used by RuleBasedBreakIterator. */
|
|
BreakIterator &operator = (const BreakIterator &other);
|
|
#endif /* U_HIDE_INTERNAL_API */
|
|
|
|
private:
|
|
|
|
/** @internal (private) */
|
|
char actualLocale[ULOC_FULLNAME_CAPACITY];
|
|
char validLocale[ULOC_FULLNAME_CAPACITY];
|
|
};
|
|
|
|
#ifndef U_HIDE_DEPRECATED_API
|
|
|
|
inline UBool BreakIterator::isBufferClone()
|
|
{
|
|
return false;
|
|
}
|
|
|
|
#endif /* U_HIDE_DEPRECATED_API */
|
|
|
|
U_NAMESPACE_END
|
|
|
|
#endif /* #if !UCONFIG_NO_BREAK_ITERATION */
|
|
|
|
#endif /* U_SHOW_CPLUSPLUS_API */
|
|
|
|
#endif // BRKITER_H
|
|
//eof
|