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