//! Definitions for serializing and deserializing graph and translator.
//!
//! N.B. after serialization the size of the graph may be much larger than
//! before since a lot of ```Rc``` are used in ```RSsystem```.

use std::io;

use serde::{Deserialize, Serialize};

use super::graph;
use super::translator::Translator;

#[derive(Serialize, Deserialize)]
struct GraphAndTranslator {
    graph:      graph::SystemGraph,
    translator: Translator,
}

/// Serializer for graph and translator.
pub fn ser<W>(
    writer: W,
    graph: &graph::SystemGraph,
    translator: &Translator,
) -> Result<(), serde_cbor_2::Error>
where
    W: io::Write,
{
    serde_cbor_2::to_writer(writer, &GraphAndTranslator {
        graph:      graph.clone(),
        translator: translator.clone(),
    })
}

/// Deserializer for file that contains graph and translator.
pub fn de<R>(
    reader: R,
) -> Result<(graph::SystemGraph, Translator), serde_cbor_2::Error>
where
    R: io::Read,
{
    let gat: GraphAndTranslator = serde_cbor_2::from_reader(reader)?;
    Ok((gat.graph, gat.translator))
}