icuSources/common/unicode/filteredbrk.h

   1 /*
   2 ********************************************************************************
   3 *   Copyright (C) 1997-2015, International Business Machines
   4 *   Corporation and others.  All Rights Reserved.
   5 ********************************************************************************
   6 */
   7
   8 #ifndef FILTEREDBRK_H
   9 #define FILTEREDBRK_H
  10
  11 #include "unicode/utypes.h"
  12 #include "unicode/brkiter.h"
  13
  14 #if !UCONFIG_NO_BREAK_ITERATION && !UCONFIG_NO_FILTERED_BREAK_ITERATION
  15
  16 #ifndef U_HIDE_DRAFT_API
  17
  18 U_NAMESPACE_BEGIN
  19
  20 /**
  21  * \file
  22  * \brief C++ API: FilteredBreakIteratorBuilder
  23  */
  24
  25 /**
  26  * The BreakIteratorFilter is used to modify the behavior of a BreakIterator
  27  *  by constructing a new BreakIterator which suppresses certain segment boundaries.
  28  *  See  http://www.unicode.org/reports/tr35/tr35-general.html#Segmentation_Exceptions .
  29  *  For example, a typical English Sentence Break Iterator would break on the space
  30  *  in the string "Mr. Smith" (resulting in two segments),
  31  *  but with "Mr." as an exception, a filtered break iterator
  32  *  would consider the string "Mr. Smith" to be a single segment.
  33  *
  34  * @draft ICU 56
  35  */
  36 class U_COMMON_API FilteredBreakIteratorBuilder : public UObject {
  37  public:
  38   /**
  39    *  destructor.
  40    * @draft ICU 56
  41    */
  42   virtual ~FilteredBreakIteratorBuilder();
  43
  44   /**
  45    * Construct a FilteredBreakIteratorBuilder based on rules in a locale.
  46    * The rules are taken from CLDR exception data for the locale,
  47    *  see http://www.unicode.org/reports/tr35/tr35-general.html#Segmentation_Exceptions
  48    *  This is the equivalent of calling createInstance(UErrorCode&)
  49    *    and then repeatedly calling addNoBreakAfter(...) with the contents
  50    *    of the CLDR exception data.
  51    * @param where the locale.
  52    * @param status The error code.
  53    * @return the new builder
  54    * @draft ICU 56
  55    */
  56   static FilteredBreakIteratorBuilder *createInstance(const Locale& where, UErrorCode& status);
  57
  58   /**
  59    * Construct an empty FilteredBreakIteratorBuilder.
  60    * In this state, it will not suppress any segment boundaries.
  61    * @param status The error code.
  62    * @return the new builder
  63    * @draft ICU 56
  64    */
  65   static FilteredBreakIteratorBuilder *createInstance(UErrorCode &status);
  66
  67   /**
  68    * Suppress a certain string from being the end of a segment.
  69    * For example, suppressing "Mr.", then segments ending in "Mr." will not be returned
  70    * by the iterator.
  71    * @param string the string to suppress, such as "Mr."
  72    * @param status error code
  73    * @return returns TRUE if the string was not present and now added,
  74    * FALSE if the call was a no-op because the string was already being suppressed.
  75    * @draft ICU 56
  76    */
  77   virtual UBool suppressBreakAfter(const UnicodeString& string, UErrorCode& status) = 0;
  78
  79   /**
  80    * Stop suppressing a certain string from being the end of the segment.
  81    * This function does not create any new segment boundaries, but only serves to un-do
  82    * the effect of earlier calls to suppressBreakAfter, or to un-do the effect of
  83    * locale data which may be suppressing certain strings.
  84    * @param exception the exception to remove
  85    * @param status error code
  86    * @return returns TRUE if the string was present and now removed,
  87    * FALSE if the call was a no-op because the string was not being suppressed.
  88    * @draft ICU 56
  89    */
  90   virtual UBool unsuppressBreakAfter(const UnicodeString& string, UErrorCode& status) = 0;
  91
  92   /**
  93    * Wrap (adopt) an existing break iterator in a new filtered instance.
  94    * The resulting BreakIterator is owned by the caller.
  95    * The BreakIteratorFilter may be destroyed before the BreakIterator is destroyed.
  96    * Note that the adoptBreakIterator is adopted by the new BreakIterator
  97    * and should no longer be used by the caller.
  98    * The FilteredBreakIteratorBuilder may be reused.
  99    * @param adoptBreakIterator the break iterator to adopt
 100    * @param status error code
 101    * @return the new BreakIterator, owned by the caller.
 102    * @draft ICU 56
 103    */
 104   virtual BreakIterator *build(BreakIterator* adoptBreakIterator, UErrorCode& status) = 0;
 105
 106  protected:
 107   /**
 108    * For subclass use
 109    * @draft ICU 56
 110    */
 111   FilteredBreakIteratorBuilder();
 112 };
 113
 114
 115 U_NAMESPACE_END
 116
 117 #endif  /* U_HIDE_DRAFT_API */
 118
 119 #endif // #if !UCONFIG_NO_BREAK_ITERATION && !UCONFIG_NO_FILTERED_BREAK_ITERATION
 120
 121 #endif // #ifndef FILTEREDBRK_H