local function isContainPos(obj, pos)
    if obj.start <= pos and obj.finish + 1 >= pos then
        return true
    end
    return false
end

local function findAtPos(results, pos)
    local res = {}
    for sources, object in pairs(results.sources) do
        if sources.type == 'multi-source' then
            for _, source in ipairs(sources) do
                if source.type ~= 'simple' and isContainPos(source, pos) then
                    res[#res+1] = {
                        object = object,
                        source = source,
                        range = source.finish - source.start,
                    }
                end
            end
        else
            local source = sources
            if source.type ~= 'simple' and isContainPos(source, pos) then
                res[#res+1] = {
                    object = object,
                    source = source,
                    range = source.finish - source.start,
                }
            end
        end
    end
    if #res == 0 then
        return nil
    end
    table.sort(res, function (a, b)
        return a.range < b.range
    end)
    return res[1].object, res[1].source
end

return function (vm, pos)
    return findAtPos(vm.results, pos)
end