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// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
********************************************************************************
* Copyright (C) 1997-2015, International Business Machines
* Corporation and others. All Rights Reserved.
********************************************************************************
*/
#ifndef FILTEREDBRK_H
#define FILTEREDBRK_H
#include "unicode/utypes.h"
#include "unicode/brkiter.h"
#if !UCONFIG_NO_BREAK_ITERATION && !UCONFIG_NO_FILTERED_BREAK_ITERATION
U_NAMESPACE_BEGIN
/**
* \file
* \brief C++ API: FilteredBreakIteratorBuilder
*/
/**
* The BreakIteratorFilter is used to modify the behavior of a BreakIterator
* by constructing a new BreakIterator which suppresses certain segment boundaries.
* See http://www.unicode.org/reports/tr35/tr35-general.html#Segmentation_Exceptions .
* For example, a typical English Sentence Break Iterator would break on the space
* in the string "Mr. Smith" (resulting in two segments),
* but with "Mr." as an exception, a filtered break iterator
* would consider the string "Mr. Smith" to be a single segment.
*
* @stable ICU 56
*/
class U_COMMON_API FilteredBreakIteratorBuilder : public UObject {
public:
/**
* destructor.
* @stable ICU 56
*/
virtual ~FilteredBreakIteratorBuilder();
/**
* Construct a FilteredBreakIteratorBuilder based on rules in a locale.
* The rules are taken from CLDR exception data for the locale,
* see http://www.unicode.org/reports/tr35/tr35-general.html#Segmentation_Exceptions
* This is the equivalent of calling createInstance(UErrorCode&)
* and then repeatedly calling addNoBreakAfter(...) with the contents
* of the CLDR exception data.
* @param where the locale.
* @param status The error code.
* @return the new builder
* @stable ICU 56
*/
static FilteredBreakIteratorBuilder *createInstance(const Locale& where, UErrorCode& status);
/**
* Construct an empty FilteredBreakIteratorBuilder.
* In this state, it will not suppress any segment boundaries.
* @param status The error code.
* @return the new builder
* @stable ICU 56
*/
static FilteredBreakIteratorBuilder *createInstance(UErrorCode &status);
/**
* Suppress a certain string from being the end of a segment.
* For example, suppressing "Mr.", then segments ending in "Mr." will not be returned
* by the iterator.
* @param string the string to suppress, such as "Mr."
* @param status error code
* @return returns TRUE if the string was not present and now added,
* FALSE if the call was a no-op because the string was already being suppressed.
* @stable ICU 56
*/
virtual UBool suppressBreakAfter(const UnicodeString& string, UErrorCode& status) = 0;
/**
* Stop suppressing a certain string from being the end of the segment.
* This function does not create any new segment boundaries, but only serves to un-do
* the effect of earlier calls to suppressBreakAfter, or to un-do the effect of
* locale data which may be suppressing certain strings.
* @param exception the exception to remove
* @param status error code
* @return returns TRUE if the string was present and now removed,
* FALSE if the call was a no-op because the string was not being suppressed.
* @stable ICU 56
*/
virtual UBool unsuppressBreakAfter(const UnicodeString& string, UErrorCode& status) = 0;
/**
* Wrap (adopt) an existing break iterator in a new filtered instance.
* The resulting BreakIterator is owned by the caller.
* The BreakIteratorFilter may be destroyed before the BreakIterator is destroyed.
* Note that the adoptBreakIterator is adopted by the new BreakIterator
* and should no longer be used by the caller.
* The FilteredBreakIteratorBuilder may be reused.
* @param adoptBreakIterator the break iterator to adopt
* @param status error code
* @return the new BreakIterator, owned by the caller.
* @stable ICU 56
*/
virtual BreakIterator *build(BreakIterator* adoptBreakIterator, UErrorCode& status) = 0;
protected:
/**
* For subclass use
* @stable ICU 56
*/
FilteredBreakIteratorBuilder();
};
U_NAMESPACE_END
#endif // #if !UCONFIG_NO_BREAK_ITERATION && !UCONFIG_NO_FILTERED_BREAK_ITERATION
#endif // #ifndef FILTEREDBRK_H
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