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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
// vim:cindent:ts=8:et:sw=4:
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* a set of ranges on a number-line */
#include "nsIntervalSet.h"
#include <new>
#include <algorithm>
nsIntervalSet::nsIntervalSet(IntervalSetAlloc aAlloc, IntervalSetFree aFree,
void* aAllocatorClosure)
: mList(nullptr),
mAlloc(aAlloc),
mFree(aFree),
mAllocatorClosure(aAllocatorClosure)
{
NS_ASSERTION(mAlloc && mFree, "null callback params");
}
nsIntervalSet::~nsIntervalSet()
{
Interval *current = mList;
while (current) {
Interval *trash = current;
current = current->mNext;
FreeInterval(trash);
}
}
void nsIntervalSet::FreeInterval(nsIntervalSet::Interval *aInterval)
{
NS_ASSERTION(aInterval, "null interval");
aInterval->Interval::~Interval();
(*mFree)(sizeof(Interval), aInterval, mAllocatorClosure);
}
void nsIntervalSet::IncludeInterval(coord_type aBegin, coord_type aEnd)
{
Interval *newInterval = static_cast<Interval*>
((*mAlloc)(sizeof(Interval), mAllocatorClosure));
if (!newInterval) {
NS_NOTREACHED("allocation failure");
return;
}
new(newInterval) Interval(aBegin, aEnd);
Interval **current = &mList;
while (*current && (*current)->mEnd < aBegin)
current = &(*current)->mNext;
newInterval->mNext = *current;
*current = newInterval;
Interval *subsumed = newInterval->mNext;
while (subsumed && subsumed->mBegin <= aEnd) {
newInterval->mBegin = std::min(newInterval->mBegin, subsumed->mBegin);
newInterval->mEnd = std::max(newInterval->mEnd, subsumed->mEnd);
newInterval->mNext = subsumed->mNext;
FreeInterval(subsumed);
subsumed = newInterval->mNext;
}
}
bool nsIntervalSet::Intersects(coord_type aBegin, coord_type aEnd) const
{
Interval *current = mList;
while (current && current->mBegin <= aEnd) {
if (current->mEnd >= aBegin)
return true;
current = current->mNext;
}
return false;
}
bool nsIntervalSet::Contains(coord_type aBegin, coord_type aEnd) const
{
Interval *current = mList;
while (current && current->mBegin <= aBegin) {
if (current->mEnd >= aEnd)
return true;
current = current->mNext;
}
return false;
}
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