133 lines
4.0 KiB
C++
133 lines
4.0 KiB
C++
/*
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**********************************************************************
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* Copyright (c) 2002, International Business Machines
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* Corporation and others. All Rights Reserved.
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**********************************************************************
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* $Source: /xsrl/Nsvn/icu/icu/source/i18n/Attic/usetiter.cpp,v $
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* $Date: 2002/04/30 22:11:47 $
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* $Revision: 1.2 $
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**********************************************************************
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*/
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#include "unicode/usetiter.h"
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#include "unicode/uniset.h"
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#include "unicode/unistr.h"
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#include "uvector.h"
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U_NAMESPACE_BEGIN
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/**
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* Create an iterator
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* @param set set to iterate over
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*/
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UnicodeSetIterator::UnicodeSetIterator(const UnicodeSet& set) {
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reset(set);
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}
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/**
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* Create an iterator. Convenience for when the contents are to be set later.
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*/
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UnicodeSetIterator::UnicodeSetIterator() {
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this->set = NULL;
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reset();
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}
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UnicodeSetIterator::~UnicodeSetIterator() {
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// Nothing to do
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}
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/**
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* Returns the next element in the set.
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* @return true if there was another element in the set.
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* if so, if codepoint == IS_STRING, the value is a string in the string field
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* else the value is a single code point in the codepoint field.
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* <br>You are guaranteed that the codepoints are in sorted order, and the strings are in sorted order,
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* and that all code points are returned before any strings are returned.
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* <br>Note also that the codepointEnd is undefined after calling this method.
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*/
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UBool UnicodeSetIterator::next() {
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if (nextElement <= endElement) {
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codepoint = codepointEnd = nextElement++;
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return TRUE;
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}
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if (range < endRange) {
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loadRange(++range);
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codepoint = codepointEnd = nextElement++;
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return TRUE;
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}
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if (nextString >= stringCount) return FALSE;
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codepoint = IS_STRING; // signal that value is actually a string
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string = (const UnicodeString*) set->strings->elementAt(nextString++);
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return TRUE;
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}
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/**
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* @return true if there was another element in the set.
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* if so, if codepoint == IS_STRING, the value is a string in the string field
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* else the value is a range of codepoints in the <codepoint, codepointEnd> fields.
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* <br>Note that the codepoints are in sorted order, and the strings are in sorted order,
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* and that all code points are returned before any strings are returned.
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* <br>You are guaranteed that the ranges are in sorted order, and the strings are in sorted order,
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* and that all ranges are returned before any strings are returned.
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* <br>You are also guaranteed that ranges are disjoint and non-contiguous.
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* <br>Note also that the codepointEnd is undefined after calling this method.
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*/
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UBool UnicodeSetIterator::nextRange() {
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if (nextElement <= endElement) {
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codepointEnd = endElement;
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codepoint = nextElement;
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nextElement = endElement+1;
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return TRUE;
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}
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if (range < endRange) {
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loadRange(++range);
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codepointEnd = endElement;
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codepoint = nextElement;
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nextElement = endElement+1;
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return TRUE;
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}
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if (nextString >= stringCount) return FALSE;
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codepoint = IS_STRING; // signal that value is actually a string
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string = (const UnicodeString*) set->strings->elementAt(nextString++);
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return TRUE;
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}
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/**
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*@param set the set to iterate over. This allows reuse of the iterator.
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*/
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void UnicodeSetIterator::reset(const UnicodeSet& set) {
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this->set = &set;
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reset();
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}
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/**
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* Resets to the start, to allow the iteration to start over again.
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*/
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void UnicodeSetIterator::reset() {
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if (set == NULL) {
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// Set up indices to empty iteration
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endRange = -1;
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stringCount = 0;
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} else {
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endRange = set->getRangeCount() - 1;
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stringCount = set->strings->size();
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}
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range = 0;
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endElement = -1;
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nextElement = 0;
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if (endRange >= 0) {
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loadRange(range);
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}
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nextString = 0;
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}
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void UnicodeSetIterator::loadRange(int32_t range) {
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nextElement = set->getRangeStart(range);
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endElement = set->getRangeEnd(range);
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}
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U_NAMESPACE_END
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//eof
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