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// License: see LICENSE file at root directory of `master` branch

//! # Plural

/// # Plural
///
/// This trait is implemented for all integers and floats along with [`PluralValues`][::PluralValues].
///
/// [::PluralValues]: struct.PluralValues.html
pub trait Plural<T> {

    /// # Formats self based on input value `x`
    fn fmt(&self, x: T) -> &str;

}

/// # Plural values
///
/// ## Examples
///
/// ```
/// use sub_strs::{Plural, PluralValues};
///
/// const ID: PluralValues = PluralValues::new("IDs", "ID", "IDs");
///
/// assert_eq!(ID.fmt(0), "IDs");
/// assert_eq!(ID.fmt(1), "ID");
/// assert_eq!(ID.fmt(2), "IDs");
/// assert_eq!(ID.fmt(3), "IDs");
/// ```
#[derive(Debug, Eq, PartialEq, Hash)]
pub struct PluralValues<'a> {
    zero: &'a str,
    one: &'a str,
    other: &'a str,
}

impl<'a> PluralValues<'a> {

    /// # Makes new instance
    pub const fn new(zero: &'a str, one: &'a str, other: &'a str) -> Self {
        Self {
            zero,
            one,
            other,
        }
    }

}

macro_rules! impl_plural_for_unsigned_integers {
    ($($ty: ty,)+) => {
        $(
            impl<'a> Plural<$ty> for PluralValues<'a> {

                fn fmt(&self, x: $ty) -> &str {
                    match x {
                        0 => self.zero,
                        1 => self.one,
                        _ => self.other,
                    }
                }

            }
        )+
    }
}

impl_plural_for_unsigned_integers!(u8, u16, u32, u64, u128, usize,);

macro_rules! impl_plural_for_signed_integers {
    ($($ty: ty,)+) => {
        $(
            impl<'a> Plural<$ty> for PluralValues<'a> {

                fn fmt(&self, x: $ty) -> &str {
                    match x {
                        0 => self.zero,
                        1 | -1 => self.one,
                        _ => self.other,
                    }
                }

            }
        )+
    }
}

impl_plural_for_signed_integers!(i8, i16, i32, i64, i128, isize,);

macro_rules! impl_plural_for_floats {
    ($($ty: ty,)+) => {
        $(
            impl<'a> Plural<$ty> for PluralValues<'a> {

                fn fmt(&self, x: $ty) -> &str {
                    match x == 0.0 {
                        true => self.zero,
                        false => self.other,
                    }
                }

            }
        )+
    }
}

impl_plural_for_floats!(f32, f64,);