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// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
**********************************************************************
* Copyright (c) 2002-2006, International Business Machines
* Corporation and others. All Rights Reserved.
**********************************************************************
*/
#include "unicode/usetiter.h"
#include "unicode/uniset.h"
#include "unicode/unistr.h"
#include "uvector.h"
U_NAMESPACE_BEGIN
UOBJECT_DEFINE_RTTI_IMPLEMENTATION(UnicodeSetIterator)
/**
* Create an iterator
* @param set set to iterate over
*/
UnicodeSetIterator::UnicodeSetIterator(const UnicodeSet& uSet) {
cpString = nullptr;
reset(uSet);
}
/**
* Create an iterator. Convenience for when the contents are to be set later.
*/
UnicodeSetIterator::UnicodeSetIterator() {
this->set = nullptr;
cpString = nullptr;
reset();
}
UnicodeSetIterator::~UnicodeSetIterator() {
delete cpString;
}
/**
* Returns the next element in the set.
* @return true if there was another element in the set.
* if so, if codepoint == IS_STRING, the value is a string in the string field
* else the value is a single code point in the codepoint field.
* <br>You are guaranteed that the codepoints are in sorted order, and the strings are in sorted order,
* and that all code points are returned before any strings are returned.
* <br>Note also that the codepointEnd is undefined after calling this method.
*/
UBool UnicodeSetIterator::next() {
if (nextElement <= endElement) {
codepoint = codepointEnd = nextElement++;
string = nullptr;
return true;
}
if (range < endRange) {
loadRange(++range);
codepoint = codepointEnd = nextElement++;
string = nullptr;
return true;
}
if (nextString >= stringCount) return false;
codepoint = static_cast<UChar32>(IS_STRING); // signal that value is actually a string
string = static_cast<const UnicodeString*>(set->strings_->elementAt(nextString++));
return true;
}
/**
* @return true if there was another element in the set.
* if so, if codepoint == IS_STRING, the value is a string in the string field
* else the value is a range of codepoints in the <codepoint, codepointEnd> fields.
* <br>Note that the codepoints are in sorted order, and the strings are in sorted order,
* and that all code points are returned before any strings are returned.
* <br>You are guaranteed that the ranges are in sorted order, and the strings are in sorted order,
* and that all ranges are returned before any strings are returned.
* <br>You are also guaranteed that ranges are disjoint and non-contiguous.
* <br>Note also that the codepointEnd is undefined after calling this method.
*/
UBool UnicodeSetIterator::nextRange() {
string = nullptr;
if (nextElement <= endElement) {
codepointEnd = endElement;
codepoint = nextElement;
nextElement = endElement+1;
return true;
}
if (range < endRange) {
loadRange(++range);
codepointEnd = endElement;
codepoint = nextElement;
nextElement = endElement+1;
return true;
}
if (nextString >= stringCount) return false;
codepoint = static_cast<UChar32>(IS_STRING); // signal that value is actually a string
string = static_cast<const UnicodeString*>(set->strings_->elementAt(nextString++));
return true;
}
/**
*@param set the set to iterate over. This allows reuse of the iterator.
*/
void UnicodeSetIterator::reset(const UnicodeSet& uSet) {
this->set = &uSet;
reset();
}
/**
* Resets to the start, to allow the iteration to start over again.
*/
void UnicodeSetIterator::reset() {
if (set == nullptr) {
// Set up indices to empty iteration
endRange = -1;
stringCount = 0;
} else {
endRange = set->getRangeCount() - 1;
stringCount = set->stringsSize();
}
range = 0;
endElement = -1;
nextElement = 0;
if (endRange >= 0) {
loadRange(range);
}
nextString = 0;
string = nullptr;
}
void UnicodeSetIterator::loadRange(int32_t iRange) {
nextElement = set->getRangeStart(iRange);
endElement = set->getRangeEnd(iRange);
}
const UnicodeString& UnicodeSetIterator::getString() {
if (string == nullptr && codepoint != static_cast<UChar32>(IS_STRING)) {
if (cpString == nullptr) {
cpString = new UnicodeString();
}
if (cpString != nullptr) {
cpString->setTo(codepoint);
}
string = cpString;
}
return *string;
}
U_NAMESPACE_END
//eof
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