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|
use std::borrow::Cow;
/// Tabled a trait responsible for providing a header fields and a row fields.
///
/// It's urgent that `header` len is equal to `fields` len.
///
/// ```text
/// Self::headers().len() == self.fields().len()
/// ```
pub trait Tabled {
/// A length of fields and headers,
/// which must be the same.
const LENGTH: usize;
/// Fields method must return a list of cells.
///
/// The cells will be placed in the same row, preserving the order.
fn fields(&self) -> Vec<Cow<'_, str>>;
/// Headers must return a list of column names.
fn headers() -> Vec<Cow<'static, str>>;
}
impl<T> Tabled for &T
where
T: Tabled,
{
const LENGTH: usize = T::LENGTH;
fn fields(&self) -> Vec<Cow<'_, str>> {
T::fields(self)
}
fn headers() -> Vec<Cow<'static, str>> {
T::headers()
}
}
impl<T> Tabled for Box<T>
where
T: Tabled,
{
const LENGTH: usize = T::LENGTH;
fn fields(&self) -> Vec<Cow<'_, str>> {
T::fields(self)
}
fn headers() -> Vec<Cow<'static, str>> {
T::headers()
}
}
macro_rules! tuple_table {
( $($name:ident)+ ) => {
impl<$($name: Tabled),+> Tabled for ($($name,)+){
const LENGTH: usize = $($name::LENGTH+)+ 0;
fn fields(&self) -> Vec<Cow<'_, str>> {
#![allow(non_snake_case)]
let ($($name,)+) = self;
let mut fields = Vec::with_capacity(Self::LENGTH);
$(fields.append(&mut $name.fields());)+
fields
}
fn headers() -> Vec<Cow<'static, str>> {
let mut fields = Vec::with_capacity(Self::LENGTH);
$(fields.append(&mut $name::headers());)+
fields
}
}
};
}
tuple_table! { A }
tuple_table! { A B }
tuple_table! { A B C }
tuple_table! { A B C D }
tuple_table! { A B C D E }
tuple_table! { A B C D E F }
macro_rules! default_table {
( $t:ty ) => {
impl Tabled for $t {
const LENGTH: usize = 1;
fn fields(&self) -> Vec<Cow<'_, str>> {
vec![Cow::Owned(self.to_string())]
}
fn headers() -> Vec<Cow<'static, str>> {
vec![Cow::Borrowed(stringify!($t))]
}
}
};
( $t:ty = borrowed ) => {
impl Tabled for $t {
const LENGTH: usize = 1;
fn fields(&self) -> Vec<Cow<'_, str>> {
vec![Cow::Borrowed(self)]
}
fn headers() -> Vec<Cow<'static, str>> {
vec![Cow::Borrowed(stringify!($t))]
}
}
};
}
default_table!(&str = borrowed);
default_table!(str = borrowed);
default_table!(String);
default_table!(char);
default_table!(bool);
default_table!(isize);
default_table!(usize);
default_table!(u8);
default_table!(u16);
default_table!(u32);
default_table!(u64);
default_table!(u128);
default_table!(i8);
default_table!(i16);
default_table!(i32);
default_table!(i64);
default_table!(i128);
default_table!(f32);
default_table!(f64);
impl<T, const N: usize> Tabled for [T; N]
where
T: std::fmt::Display,
{
const LENGTH: usize = N;
fn fields(&self) -> Vec<Cow<'_, str>> {
self.iter()
.map(ToString::to_string)
.map(Cow::Owned)
.collect()
}
fn headers() -> Vec<Cow<'static, str>> {
(0..N).map(|i| Cow::Owned(format!("{i}"))).collect()
}
}
|
