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