michael@0: /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
michael@0: // vim:cindent:ts=8:et:sw=4:
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: /* a set of ranges on a number-line */
michael@0: 
michael@0: #include "nsIntervalSet.h"
michael@0: #include <new>
michael@0: #include <algorithm>
michael@0: 
michael@0: nsIntervalSet::nsIntervalSet(IntervalSetAlloc aAlloc, IntervalSetFree aFree,
michael@0:                              void* aAllocatorClosure)
michael@0:     : mList(nullptr),
michael@0:       mAlloc(aAlloc),
michael@0:       mFree(aFree),
michael@0:       mAllocatorClosure(aAllocatorClosure)
michael@0: {
michael@0:     NS_ASSERTION(mAlloc && mFree, "null callback params");
michael@0: }
michael@0: 
michael@0: nsIntervalSet::~nsIntervalSet()
michael@0: {
michael@0:     Interval *current = mList;
michael@0:     while (current) {
michael@0:         Interval *trash = current;
michael@0:         current = current->mNext;
michael@0:         FreeInterval(trash);
michael@0:     }
michael@0: }
michael@0: 
michael@0: void nsIntervalSet::FreeInterval(nsIntervalSet::Interval *aInterval)
michael@0: {
michael@0:     NS_ASSERTION(aInterval, "null interval");
michael@0: 
michael@0:     aInterval->Interval::~Interval();
michael@0:     (*mFree)(sizeof(Interval), aInterval, mAllocatorClosure);
michael@0: }
michael@0: 
michael@0: void nsIntervalSet::IncludeInterval(coord_type aBegin, coord_type aEnd)
michael@0: {
michael@0:     Interval *newInterval = static_cast<Interval*>
michael@0:                                        ((*mAlloc)(sizeof(Interval), mAllocatorClosure));
michael@0:     if (!newInterval) {
michael@0:         NS_NOTREACHED("allocation failure");
michael@0:         return;
michael@0:     }
michael@0:     new(newInterval) Interval(aBegin, aEnd);
michael@0: 
michael@0:     Interval **current = &mList;
michael@0:     while (*current && (*current)->mEnd < aBegin)
michael@0:         current = &(*current)->mNext;
michael@0: 
michael@0:     newInterval->mNext = *current;
michael@0:     *current = newInterval;
michael@0: 
michael@0:     Interval *subsumed = newInterval->mNext;
michael@0:     while (subsumed && subsumed->mBegin <= aEnd) {
michael@0:         newInterval->mBegin = std::min(newInterval->mBegin, subsumed->mBegin);
michael@0:         newInterval->mEnd = std::max(newInterval->mEnd, subsumed->mEnd);
michael@0:         newInterval->mNext = subsumed->mNext;
michael@0:         FreeInterval(subsumed);
michael@0:         subsumed = newInterval->mNext;
michael@0:     }
michael@0: }
michael@0: 
michael@0: bool nsIntervalSet::Intersects(coord_type aBegin, coord_type aEnd) const
michael@0: {
michael@0:     Interval *current = mList;
michael@0:     while (current && current->mBegin <= aEnd) {
michael@0:         if (current->mEnd >= aBegin)
michael@0:             return true;
michael@0:         current = current->mNext;
michael@0:     }
michael@0:     return false;
michael@0: }
michael@0: 
michael@0: bool nsIntervalSet::Contains(coord_type aBegin, coord_type aEnd) const
michael@0: {
michael@0:     Interval *current = mList;
michael@0:     while (current && current->mBegin <= aBegin) {
michael@0:         if (current->mEnd >= aEnd)
michael@0:             return true;
michael@0:         current = current->mNext;
michael@0:     }
michael@0:     return false;
michael@0: }