RangeMap.cxx revision 7c478bd95313f5f23a4c958a745db2134aa03244
// Copyright (c) 1994 James Clark
// See the file COPYING for copying permission.
#pragma ident "%Z%%M% %I% %E% SMI"
#ifndef RangeMap_DEF_INCLUDED
#define RangeMap_DEF_INCLUDED 1
#include "RangeMap.h"
#include "ISet.h"
#include "types.h"
#ifdef SP_NAMESPACE
namespace SP_NAMESPACE {
#endif
template<class From, class To>
RangeMap<From, To>::RangeMap()
{
}
template<class From, class To>
Boolean RangeMap<From, To>::map(From from, To &to, From &alsoMax) const
{
// FIXME use binary search
for (size_t i = 0; i < ranges_.size(); i++) {
const RangeMapRange<From,To> &r = ranges_[i];
if (r.fromMin <= from && from <= r.fromMax) {
to = r.toMin + (from - r.fromMin);
alsoMax = r.fromMax;
return 1;
}
if (r.fromMin > from) {
alsoMax = r.fromMin - 1;
return 0;
}
}
alsoMax = From(-1);
return 0;
}
typedef ISet<WideChar> RangeMap_dummy;
template<class From, class To>
unsigned RangeMap<From, To>::inverseMap(To to, From &from,
ISet<WideChar> &fromSet,
WideChar &count) const
{
// FIXME use binary search
unsigned ret = 0;
count = WideChar(-1);
for (size_t i = 0; i < ranges_.size(); i++) {
const RangeMapRange<From,To> &r = ranges_[i];
if (r.toMin <= to && to <= r.toMin + (r.fromMax - r.fromMin)) {
From n = r.fromMin + (to - r.toMin);
WideChar thisCount = r.fromMax - n + 1;
if (ret > 1) {
fromSet.add(n);
if (thisCount < count)
count = thisCount;
}
else if (ret == 1) {
fromSet.add(from);
fromSet.add(n);
ret = 2;
if (thisCount < count)
count = thisCount;
}
else {
count = thisCount;
from = n;
ret = 1;
}
}
else if (ret == 0 && r.toMin > to && (r.toMin - to < count))
count = r.toMin - to;
}
return ret;
}
template<class From, class To>
RangeMapIter<From, To>::RangeMapIter(const RangeMap<From, To> &map)
: count_(map.ranges_.size()), ptr_(map.ranges_.begin())
{
}
// If the new range overlaps an existing one, the new
// one takes precedence.
template<class From, class To>
void RangeMap<From, To>::addRange(From fromMin, From fromMax, To toMin)
{
// FIXME use binary search
size_t i;
for (i = ranges_.size(); i > 0; i--)
if (fromMin > ranges_[i - 1].fromMax)
break;
// fromMin <= ranges[i].fromMax
Boolean coalesced = 0;
if (i > 0
&& ranges_[i - 1].fromMax + 1 == fromMin
&& ranges_[i - 1].toMin + (fromMin - ranges_[i - 1].fromMin) == toMin) {
// coalesce with previous
ranges_[i - 1].fromMax = fromMax;
i--;
coalesced = 1;
}
else if (i < ranges_.size() && fromMax >= ranges_[i].fromMin - 1) {
// overlap
if (fromMin <= ranges_[i].fromMin) {
if (toMin + (ranges_[i].fromMin - fromMin) == ranges_[i].toMin) {
ranges_[i].fromMin = fromMin;
if (fromMax <= ranges_[i].fromMax)
return;
ranges_[i].fromMax = fromMax;
coalesced = 1;
}
}
else {
// fromMin > ranges_[i].fromMin
if (ranges_[i].toMin + (fromMin - ranges_[i].fromMin) == toMin) {
if (fromMax < ranges_[i].fromMax)
return;
ranges_[i].fromMax = fromMax;
coalesced = 1;
}
}
}
if (!coalesced) {
// insert
ranges_.resize(ranges_.size() + 1);
for (size_t j = ranges_.size() - 1; j > i; j--)
ranges_[j] = ranges_[j - 1];
ranges_[i].fromMin = fromMin;
ranges_[i].fromMax = fromMax;
ranges_[i].toMin = toMin;
}
// Delete overlapping ranges starting at i + 1.
size_t j;
for (j = i + 1; j < ranges_.size(); j++) {
if (fromMax < ranges_[j].fromMax) {
if (fromMax >= ranges_[j].fromMin)
ranges_[j].fromMin = fromMax + 1;
break;
}
}
if (j > i + 1) {
// delete i + 1 ... j - 1
// j -> i + 1
// j - 1 -> i + 2
size_t count = ranges_.size() - j;
for (size_t k = 0; k < count; k++)
ranges_[i + 1 + count] = ranges_[j + count];
ranges_.resize(ranges_.size() - (j - (i + 1)));
}
}
#ifdef SP_NAMESPACE
}
#endif
#endif /* not RangeMap_DEF_INCLUDED */