Access factorio data by folder/file path liked string

factorioStringPathAccessNode.lua

local function split(inputstr, sep)
    if sep == nil then sep = "%s" end
    local result_table = {}
    for str in string.gmatch(inputstr, "([^" .. sep .. "]+)") do
        table.insert(result_table, str)
    end
    return result_table
end

function Ptable(table_, path)
    -- example path: action/{type=direct}/action_delivery/target_effects
    local last_table = table_
    local i = 0
    for node in string.gmatch(path, "[^/]+") do
        i = i + 1
        if string.match(node, "{.*=.*}") then
            local key_value = split(string.sub(node, 2, -2), "=")
            assert(#key_value == 2,
                   string.format("Node <%s> should be {key=value}", node))
            local key = key_value[1]
            local value = key_value[2]
            for _, v in pairs(last_table) do
                if v[key] == value then last_table = v end
            end
        else
            last_table = last_table[node]
        end
        assert(last_table ~= nil,
               string.format("Read node <%s:%d> of `%s` fail", node, i, path))
    end
    return last_table
end