elem_regions.hpp

 
#pragma once
 
#include <cstddef>
#include <map>
#include <string>
#include <vector>
 
namespace nk {

struct ElemRegion
{
    size_t r0 = 1, r1 = 0, c0 = 1, c1 = 0;
 
    bool empty() const { return r1 < r0 || c1 < c0; }
    bool intersects(const ElemRegion &o) const
    {
        return !empty() && !o.empty() && r0 <= o.r1 && o.r0 <= r1
               && c0 <= o.c1 && o.c0 <= c1;
    }
};

struct VarRegions
{
    bool all = false;
    std::vector<ElemRegion> rects;
 
    void setAll() { all = true; }
    void add(const ElemRegion &r)
    {
        if (!r.empty())
            rects.push_back(r);
    }
    bool touches(const ElemRegion &r) const
    {
        if (all)
            return true;
        for (const auto &x : rects)
            if (x.intersects(r))
                return true;
        return false;
    }
    bool touchesAll() const { return all || !rects.empty(); }
};

using ElemAccessMap = std::map<std::string, VarRegions>;
 
}  // namespace nk