109 lines
3.0 KiB
C++
109 lines
3.0 KiB
C++
/*
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**********************************************************************
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* Copyright (C) 1999, International Business Machines
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* 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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#include "unirange.h"
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#include "uvector.h"
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#include "unicode/unistr.h"
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UnicodeRange::UnicodeRange(UChar theStart, int32_t theLength) {
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start = theStart;
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length = theLength;
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}
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UnicodeRange* UnicodeRange::clone() const {
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return new UnicodeRange(start, length);
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}
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/**
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* CALLER OWNS RESULT.
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*/
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UBool UnicodeRange::contains(UChar c) const {
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return c >= start && (c - start) < length;
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}
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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* UnicodeRange::split(UChar c) {
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if (c == start) {
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++start;
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--length;
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return 0;
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} else if (c - start == length - 1) {
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--length;
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return 0;
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} else {
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++c;
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UnicodeRange* r = new UnicodeRange(c, start + length - c);
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length = --c - start;
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return r;
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}
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}
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/**
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* Finds the largest unused subrange by the given string. A
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* subrange is unused by a string if the string contains no
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* characters in that range. If the given string contains no
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* 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*
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UnicodeRange::largestUnusedSubrange(const UnicodeString& str) const {
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int32_t n = str.length();
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UVector v;
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v.setDeleter(UnicodeRange::deleter);
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v.addElement(clone());
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for (int32_t i=0; i<n; ++i) {
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UChar c = str.charAt(i);
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if (contains(c)) {
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for (int32_t j=0; j<v.size(); ++j) {
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UnicodeRange* r = (UnicodeRange*) v.elementAt(j);
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if (r->contains(c)) {
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r = r->split(c);
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if (r != 0) {
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v.addElement(r);
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}
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break;
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}
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}
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}
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}
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UnicodeRange* bestRange = 0;
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int32_t ibest = -1;
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for (int32_t j=0; j<v.size(); ++j) {
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UnicodeRange* r = (UnicodeRange*) v.elementAt(j);
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if (bestRange == 0 || r->length > bestRange->length) {
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bestRange = r;
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ibest = j;
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}
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}
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v.orphanElementAt(ibest); // So bestRange doesn't get deleted
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return bestRange;
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}
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// For UVector of UnicodeRange* objects
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void U_CALLCONV UnicodeRange::deleter(void* e) {
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delete (UnicodeRange*) e;
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}
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