use crate::{
grid::records::{ExactRecords, Records, Resizable},
settings::TableOption,
};
#[derive(Debug, Clone, Copy, Default, Hash, PartialEq, Eq, PartialOrd, Ord)]
pub struct Reverse {
columns: bool,
}
impl Reverse {
pub const fn columns() -> Self {
Self { columns: true }
}
pub const fn rows() -> Self {
Self { columns: false }
}
}
impl<R, D, C> TableOption<R, C, D> for Reverse
where
R: Resizable + Records + ExactRecords,
{
fn change(self, records: &mut R, _: &mut C, _: &mut D) {
match self.columns {
true => reverse_columns(records),
false => reverse_rows(records),
}
}
}
fn reverse_rows<R>(data: &mut R)
where
R: Resizable + ExactRecords,
{
let count_rows = data.count_rows();
if count_rows < 2 {
return;
}
for row in 0..count_rows / 2 {
data.swap_row(row, count_rows - row - 1);
}
}
fn reverse_columns<R>(data: &mut R)
where
R: Resizable + Records,
{
let count_columns = data.count_columns();
if count_columns < 2 {
return;
}
for col in 0..count_columns / 2 {
data.swap_column(col, count_columns - col - 1);
}
}
#[cfg(test)]
#[cfg(feature = "std")]
mod tests {
use crate::grid::records::vec_records::VecRecords;
use super::{reverse_columns, reverse_rows};
#[test]
fn test_reverse_rows() {
assert_eq!(
rev_rows(vec![vec![0, 1, 2], vec![3, 4, 5], vec![6, 7, 8]]),
vec![vec![6, 7, 8], vec![3, 4, 5], vec![0, 1, 2]]
)
}
#[test]
fn test_reverse_columns() {
assert_eq!(
rev_cols(vec![vec![0, 1, 2], vec![3, 4, 5], vec![6, 7, 8]]),
vec![vec![2, 1, 0], vec![5, 4, 3], vec![8, 7, 6]]
)
}
fn rev_rows(mut data: Vec<Vec<usize>>) -> Vec<Vec<usize>> {
reverse_rows(&mut data);
data
}
fn rev_cols(data: Vec<Vec<usize>>) -> Vec<Vec<usize>> {
let mut records = VecRecords::new(data);
reverse_columns(&mut records);
records.into()
}
}