79 lines
2.3 KiB
C++
79 lines
2.3 KiB
C++
/*
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**********************************************************************
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* Copyright © {1999}, International Business Machines Corporation and others. All Rights Reserved.
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**********************************************************************
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* Date Name Description
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* 11/17/99 aliu Creation.
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**********************************************************************
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*/
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#ifndef UNIRANGE_H
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#define UNIRANGE_H
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#include "utypes.h"
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class UnicodeString;
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/**
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* %%% INTERNAL CLASS USED BY RuleBasedTransliterator %%%
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*
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* A range of Unicode characters. Support the operations of testing for
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* inclusion (does this range contain this character?) and splitting.
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* Splitting involves breaking a range into two smaller ranges around a
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* character inside the original range. The split character is not included
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* in either range. If the split character is at either extreme end of the
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* range, one of the split products is an empty range.
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*
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* This class is used internally to determine the largest available private
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* use character range for variable stand-ins.
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*/
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class UnicodeRange {
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public:
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UChar start;
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int32_t length;
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UnicodeRange(UChar start, int32_t length);
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/**
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* CALLER OWNS RESULT.
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*/
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UnicodeRange* clone() const;
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bool_t contains(UChar c) const;
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/**
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* Assume that contains(c) is true. Split this range into two new
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* ranges around the character c. Make this range one of the new ranges
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* (modify it in place) and return the other new range. The character
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* itself is not included in either range. If the split results in an
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* empty range (that is, if c == start or c == start + length - 1) then
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* return null.
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*
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* MODIFIES THIS RANGE IN PLACE.
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*
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* CALLER OWNS RESULT.
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*/
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UnicodeRange* split(UChar c);
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/**
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* Finds the largest subrange of this range that is unused by the
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* given string. A subrange is unused by a string if the string
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* contains no characters in that range. If the given string
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* contains no characters in this range, then this range itself is
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* returned.
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*
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* CALLER OWNS RESULT.
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*/
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UnicodeRange* largestUnusedSubrange(const UnicodeString& str) const;
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private:
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// For UVector of UnicodeRange* objects
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static void deleter(void*);
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};
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#endif
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