qfall-math 0.1.1

// Copyright © 2023 Marvin Beckmann
//
// This file is part of qFALL-math.
//
// qFALL-math is free software: you can redistribute it and/or modify it under
// the terms of the Mozilla Public License Version 2.0 as published by the
// Mozilla Foundation. See <https://mozilla.org/en-US/MPL/2.0/>.

//! This module contains implementations of functions
//! important for serialization such as the [`Serialize`] and [`Deserialize`] trait.
//!
//! The explicit functions contain the documentation.

use crate::{
    macros::serialize::{deserialize, serialize},
    rational::PolyOverQ,
};
use core::fmt;
use serde::{
    Deserialize, Serialize,
    de::{Error, MapAccess, Unexpected, Visitor},
    ser::SerializeStruct,
};
use std::str::FromStr;

serialize!("poly", PolyOverQ);
deserialize!("poly", Poly, PolyOverQ);

#[cfg(test)]
mod test_serialize {
    use crate::rational::PolyOverQ;
    use std::str::FromStr;

    /// Tests whether the serialization of a positive [`PolyOverQ`] works.
    #[test]
    fn serialize_output_positive() {
        let poly_str = "2  17/3 42/17";
        let poly_z = PolyOverQ::from_str(poly_str).unwrap();
        let cmp_str = format!("{{\"poly\":\"{poly_str}\"}}");

        assert_eq!(cmp_str, serde_json::to_string(&poly_z).unwrap());
    }

    /// Tests whether the serialization of a negative [`PolyOverQ`] works.
    #[test]
    fn serialize_output_negative() {
        let poly_str = "3  -17/3 -42/17 1";
        let poly_z = PolyOverQ::from_str(poly_str).unwrap();
        let cmp_str = format!("{{\"poly\":\"{poly_str}\"}}");

        assert_eq!(cmp_str, serde_json::to_string(&poly_z).unwrap());
    }

    /// Tests whether the serialization of a positive large [`PolyOverQ`] works.
    #[test]
    fn serialize_output_positive_large() {
        let poly_str = format!("3  -17/3 {}/2 1", u64::MAX);
        let poly_z = PolyOverQ::from_str(&poly_str).unwrap();
        let cmp_str = format!("{{\"poly\":\"{poly_str}\"}}");

        assert_eq!(cmp_str, serde_json::to_string(&poly_z).unwrap());
    }

    /// Tests whether the serialization of a negative large [`PolyOverQ`] works.
    #[test]
    fn serialize_output_negative_large() {
        let poly_str = format!("3  -17/3 -{}/2 1", u64::MAX);
        let poly_z = PolyOverQ::from_str(&poly_str).unwrap();
        let cmp_str = format!("{{\"poly\":\"{poly_str}\"}}");

        assert_eq!(cmp_str, serde_json::to_string(&poly_z).unwrap());
    }
}

#[cfg(test)]
mod test_deserialize {
    use crate::rational::PolyOverQ;
    use std::str::FromStr;

    /// Tests whether the deserialization of a positive [`PolyOverQ`] works.
    #[test]
    fn deserialize_positive() {
        let poly_str = "2  17/3 42/17";
        let cmp_str = format!("{{\"poly\":\"{poly_str}\"}}");

        let poly_q = PolyOverQ::from_str(poly_str).unwrap();
        assert_eq!(poly_q, serde_json::from_str::<PolyOverQ>(&cmp_str).unwrap());
    }

    /// Tests whether the deserialization of a negative [`PolyOverQ`] works.
    #[test]
    fn deserialize_negative() {
        let poly_str = "3  -17/3 -42/17 1";
        let cmp_str = format!("{{\"poly\":\"{poly_str}\"}}");

        let poly_q = PolyOverQ::from_str(poly_str).unwrap();
        assert_eq!(poly_q, serde_json::from_str::<PolyOverQ>(&cmp_str).unwrap());
    }

    /// Tests whether the deserialization of a positive large [`PolyOverQ`] works.
    #[test]
    fn deserialize_positive_large() {
        let poly_str = format!("3  -17/3 {}/2 1", u64::MAX);
        let cmp_str = format!("{{\"poly\":\"{poly_str}\"}}");

        let poly_q = PolyOverQ::from_str(&poly_str).unwrap();
        assert_eq!(poly_q, serde_json::from_str::<PolyOverQ>(&cmp_str).unwrap());
    }

    /// Tests whether the deserialization of a negative large [`PolyOverQ`] works.
    #[test]
    fn deserialize_negative_large() {
        let poly_str = format!("3  -17/3 -{}/2 1", u64::MAX);
        let cmp_str = format!("{{\"poly\":\"{poly_str}\"}}");

        let poly_q = PolyOverQ::from_str(&poly_str).unwrap();
        assert_eq!(poly_q, serde_json::from_str::<PolyOverQ>(&cmp_str).unwrap());
    }

    /// Tests whether no fields 'poly' provided yield an error
    #[test]
    fn no_field_value() {
        let a: Result<PolyOverQ, serde_json::Error> =
            serde_json::from_str("{{\"tree\":\"{2  17/3 42/17}\"}}");
        assert!(a.is_err());

        let b: Result<PolyOverQ, serde_json::Error> = serde_json::from_str("{{}}");
        assert!(b.is_err());
    }

    /// Tests whether too many fields yield an error
    #[test]
    fn too_many_fields() {
        let a: Result<PolyOverQ, serde_json::Error> =
            serde_json::from_str("{{\"tree\":\"{2  17/3 42/17}\", \"poly\":\"{2  17/3 42/17}\"}}");
        assert!(a.is_err());

        let b: Result<PolyOverQ, serde_json::Error> =
            serde_json::from_str("{{\"poly\":\"{}\", \"poly\":\"{2  17/3 42/17}\"}}");
        assert!(b.is_err());
    }
}