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public bool PlayerCanUnlock(BasePlayer player, TechTreeData.NodeInstance node)

    {

    if (this.PlayerHasPathForUnlock(player, node))

      return !this.HasPlayerUnlocked(player, node);

    return false;

    }

    public bool HasPlayerUnlocked(BasePlayer player, TechTreeData.NodeInstance node)

    {

    if (!node.IsGroup())

      return player.blueprints.HasUnlocked(node.itemDef);

    bool flag = true;

    foreach (int output in node.outputs)

    {

      TechTreeData.NodeInstance byId = this.GetByID(output);

      if (!this.HasPlayerUnlocked(player, byId))

        flag = false;

    }

    return flag;

    }