tabled 0.21.0

An easy to use library for pretty print tables of Rust `struct`s and `enum`s.
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//! An empty [`Records`] implementation.

use core::iter::{repeat_n, RepeatN};

use crate::grid::records::ExactRecords;

use super::Records;

/// Empty representation of [`Records`].
#[derive(Debug, Default, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct EmptyRecords {
    rows: usize,
    cols: usize,
}

impl EmptyRecords {
    /// Constructs an empty representation of [`Records`] with a given shape.
    pub fn new(rows: usize, cols: usize) -> Self {
        Self { rows, cols }
    }
}

impl From<(usize, usize)> for EmptyRecords {
    fn from((count_rows, count_columns): (usize, usize)) -> Self {
        Self::new(count_rows, count_columns)
    }
}

impl Records for EmptyRecords {
    type Iter = RepeatN<RepeatN<&'static str>>;

    fn iter_rows(self) -> Self::Iter {
        repeat_n(repeat_n("", self.cols), self.rows)
    }

    fn count_columns(&self) -> usize {
        self.cols
    }

    fn hint_count_rows(&self) -> Option<usize> {
        Some(self.rows)
    }
}

impl ExactRecords for EmptyRecords {
    fn count_rows(&self) -> usize {
        self.rows
    }
}