source: cpp/frams/util/multimap.cpp @ 1133

// This file is a part of Framsticks SDK.  http://www.framsticks.com/
// Copyright (C) 1999-2015  Maciej Komosinski and Szymon Ulatowski.
// See LICENSE.txt for details.

#include "multimap.h"
#include <stdio.h>

int MultiMap::getBegin() const
{
        if (isEmpty()) return 0;
        return getBegin(0);
}

int MultiMap::getEnd() const
{
        if (isEmpty()) return -1;
        return getBegin(mappingCount() - 1) - 1;
}

int MultiMap::findData(int x) const
{
        if (isEmpty()) return -1;
        if (getBegin(0) > x) return -1;
        int a, b, c;
        int n = mappingCount() - 1;
        a = 0; b = n; // find c = last range with begin<=x
        while (1){
                c = (a + b + 1) / 2;
                if (getBegin(c) <= x)
                {
                        if ((c == n) || (getBegin(c + 1) > x)) return c;
                        a = c;
                }
                else
                {
                        b = c - 1;
                }
        }
}

int MultiMap::addRange(int &r, const MultiRange& mr)
{
        // precondition: 0 <= r < (mappingCount()-1)
        // 1.maybe change mapping in this range
        int ret = 0;
        SingleMapping *sm = getMapping(r);
        if (sm->to.contains(mr)) return 0; // do nothing
        sm->to.add(mr);
        // after adding mr to this mapping it could be the same as the previous/next one
        if (r > 0) // prev exists
        {
                SingleMapping *prev = getMapping(r - 1);
                if (prev->to == sm->to)
                { // splice with prev
                        removeData(r);
                        delete sm;
                        sm = prev;
                        r--;
                        ret--;
                }
        }
        if (r < (mappingCount() - 2)) // next exists
        {
                SingleMapping *next = getMapping(r + 1);
                if (next->to == sm->to)
                { // splice with next
                        removeData(r + 1);
                        delete next;
                        ret--;
                        r--;
                }
        }
        return ret;
}

int MultiMap::addRangeBeginEnd(int &r, int begin, int end, const MultiRange& mr)
{
        // precondition: -1 <= r < mappingCount()
        //               begin <= end
        //               begin >= mapping.begin
        //               end < nextmapping.begin
        SingleMapping *m, *m2, *m1;
        if (r < 0)
        {
                if (mappingCount())
                {
                        m = getMapping(0);
                        if (end == (m->begin - 1))
                        { // adjacent to m
                                if (m->to == mr)
                                { // shift only
                                        m->begin = begin;
                                        return 0;
                                }
                                // single add
                                SingleMapping *newmap = new SingleMapping(begin, mr);
                                addData(0, newmap);
                                r = 0;
                                return 1;
                        }
                }
                // double add
                SingleMapping *newmap = new SingleMapping(begin, mr);
                SingleMapping *newmap2 = new SingleMapping(end + 1);
                addData(0, newmap);
                addData(1, newmap2);
                r = 1;
                return 2;
        }

        if (r == (mappingCount() - 1))
        {
                m = getMapping(r);
                m1 = getMapping(r - 1);
                if (begin == m->begin)
                { // adjacent
                        if (m1->to == mr)
                        { // shift only
                                m->begin = end + 1;
                                return 0;
                        }
                        // single add
                        m->begin = end + 1;
                        SingleMapping *newmap = new SingleMapping(begin, mr);
                        addData(r, newmap);
                        return 1;
                }
                // double add
                SingleMapping *newmap = new SingleMapping(begin, mr);
                SingleMapping *newmap2 = new SingleMapping(end + 1);
                addData(r + 1, newmap);
                addData(r + 2, newmap2);
                r += 2;
                return 2;
        }

        m = getMapping(r);
        if (m->to.contains(mr)) return 0;
        if (begin == m->begin) // begin at range boundary
        {
                m2 = getMapping(r + 1);
                if (end == (m2->begin - 1)) return addRange(r, mr);

                SingleMapping *newmap = new SingleMapping(begin, m->to);
                newmap->to.add(mr);
                if (r > 0)
                { // join prev possible...
                        m1 = getMapping(r - 1);
                        if (m1->to == newmap->to)
                        { // joint prev = shift
                                delete newmap;
                                m->begin = end + 1;
                                return 0;
                        }
                }
                // single add:
                m->begin = end + 1;
                addData(r, newmap);
                return 1;
        }

        m2 = getMapping(r + 1);
        if (end == (m2->begin - 1)) // end at range boundary
        {
                SingleMapping *newmap = new SingleMapping(begin, m->to);
                newmap->to.add(mr);
                if (r < (mappingCount() - 2))
                { // join next possible...
                        if (m2->to == newmap->to)
                        { // joint next = shift
                                m2->begin = begin;
                                delete newmap;
                                return 0;
                        }
                }
                // single add
                r++;
                addData(r, newmap);
                return 1;
        }
        // double add:
        SingleMapping *newmap = new SingleMapping(begin, m->to);
        newmap->to.add(mr);
        SingleMapping *newmap2 = new SingleMapping(end + 1, m->to);
        addData(r + 1, newmap);
        addData(r + 2, newmap2);
        r += 2;
        return 2;
}

void MultiMap::add(int begin, int end, const MultiRange& to)
{
        if (to.isEmpty()) return;
        if (end < begin) return;
        int r1 = findData(begin);
        int r2 = findData(end);
        if (r1 == r2)
        {
                addRangeBeginEnd(r1, begin, end, to);
        }
        else
        {
                r2 += addRangeBeginEnd(r1, begin, getBegin(r1 + 1) - 1, to);
                r1++;
                for (; r1 < r2; r1++)
                        r2 += addRange(r1, to);
                addRangeBeginEnd(r1, getBegin(r1), end, to);
        }
}

const MultiRange& MultiMap::map(int x) const
{
        static MultiRange empty;
        int m = findData(x);
        if (m < 0) return empty;
        SingleMapping *sm = getMapping(m);
        return sm->to;
}

MultiRange MultiMap::map(int begin, int end) const
{
        MultiRange mr;
        int m = findData(begin);
        for (; m < rangeCount(); m++)
                if (m >= 0)
                {
                SingleMapping *sm = getMapping(m);
                if (sm->begin > end) break;
                mr.add(sm->to);
                }
        return mr;
}

MultiRange MultiMap::map(const MultiRange& ranges) const
{
        MultiRange mr;
        for (int i = 0; i < ranges.rangeCount(); i++)
                mr.add(map(ranges.getRange(i)));
        return mr;
}

IRange MultiMap::getRange(int i) const
{
        if ((i<0) || (i>(data.size() - 1))) return IRange();
        return IRange(getBegin(i), getBegin(i + 1) - 1);
}

void MultiMap::operator=(const MultiMap& mm)
{
        clear();
        for (int i = 0; i < mm.mappingCount(); i++)
                addData(i, new SingleMapping(*mm.getMapping(i)));
}

void MultiMap::addCombined(const MultiMap& m1, const MultiMap& m2)
{
        for (int i = 0; i < m1.rangeCount(); i++)
        {
                IRange r = m1.getRange(i);
                add(r, m2.map(m1.getMapping(i)->to));
        }
}

void MultiMap::add(const MultiRange& from, const MultiRange& to)
{
        for (int i = 0; i < from.rangeCount(); i++)
                add(from.getRange(i), to);
}

void MultiMap::addReversed(const MultiMap& m)
{
        for (int i = 0; i < m.rangeCount(); i++)
        {
                IRange r = m.getRange(i);
                const MultiRange& mr = m.getMapping(i)->to;
                for (int j = 0; j < mr.rangeCount(); j++)
                        add(mr.getRange(j), r);
        }
}

MultiMap::~MultiMap()
{
        clear();
}

void MultiMap::clear()
{
        for (int i = 0; i < data.size(); i++)
                delete getData(i);
        data.clear();
}

///////////////////

void MultiMap::print() const
{
        printf("{ ");
        for (int i = 0; i < (mappingCount() - 1); i++)
        {
                if (i) printf("  ");
                SingleMapping *sm = getMapping(i);
                SingleMapping *sm2 = getMapping(i + 1);
                if (sm2->begin == sm->begin + 1)
                        printf("[%d] -> ", sm->begin);
                else
                        printf("[%d-%d] -> ", sm->begin, sm2->begin - 1);
                sm->to.print();
                printf("\n");
        }
        printf("}\n");
}

void MultiMap::print2() const
{
        int y;
        int id = 0, id2;
        if (isEmpty())
        {
                printf("{ empty }\n");
                return;
        }
        printf("{\n");
        for (y = getBegin(); y <= getEnd(); y++)
        {
                id2 = findMappingId(y + 1);
                printf("%2d %c", y, (id2 != id) ? '_' : ' ');
                id = id2;
                map(y).print2();
                printf("\n");
        }
        printf("}\n");
}