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/*
* Copyright (c) 2020-2021 Thomas Kramer.
*
* This file is part of LibrEDA
* (see https://codeberg.org/libreda).
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
//! Data structures for representation of circuit-level netlists.
//!
//! A netlist represents the connections of electrical components (here called 'circuits')
//! such as standard-cells or macro blocks. Each of the circuits can be composed of instances of
//! other circuits (recursion is not allowed).
//! A circuit serves as a template for circuit instances. The circuit defines 'pins' which represent
//! the electrical connectors to the circuit. Pins can be connected electrically by 'nets' which represent
//! an electrical potential like a metal wire. Nets are local to a circuit.
//!
//! Netlists can be implemented in different ways. This module provides [`RcNetlist`] and [`HashMapNetlist`].
//! [`RcNetlist`] emulates an object oriented approach, where circuits, instances, pins, nets, etc., are
//! represented as a resource counted struct. This is convenient in certain cases but is a complicated
//! pattern in respect of mutability. [`HashMapNetlist`] is a simpler structure without any interior mutability
//! patterns.
//!
//! Some traits are used to create abstractions over the different netlist implementations:
//! * [`NetlistBase`] defines basic functions for accessing and traversing a netlist.
//! * [`NetlistEdit`] defines basic functions for building and modifying a netlist.
//!
//! [`RcNetlist`]: rc_netlist::rc_netlist::RcNetlist
//! [`HashMapNetlist`]: hashmap_netlist::HashMapNetlist
//! [`NetlistBase`]: traits::NetlistBase
//! [`NetlistEdit`]: traits::NetlistEdit