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|
use std::ops::{RangeBounds, RangeFull};
use crate::{
grid::config::Entity,
grid::records::{ExactRecords, Records},
settings::object::{cell::EntityOnce, Object},
};
use super::util::bounds_to_usize;
/// This structure represents a sub table of [`Table`].
///
/// [`Table`]: crate::Table
#[derive(Debug)]
pub struct Segment<C, R> {
columns: C,
rows: R,
}
impl Segment<RangeFull, RangeFull> {
/// Returns a table segment on which are present all cells.
pub fn all() -> SegmentAll {
SegmentAll
}
}
impl<C, R> Segment<C, R>
where
C: RangeBounds<usize>,
R: RangeBounds<usize>,
{
/// This function builds a [`Segment`].
pub fn new(rows: R, columns: C) -> Self {
Self { columns, rows }
}
}
impl<I, C, R> Object<I> for Segment<C, R>
where
C: RangeBounds<usize>,
R: RangeBounds<usize>,
I: Records + ExactRecords,
{
type Iter = SectorIter;
fn cells(&self, records: &I) -> Self::Iter {
let start = self.rows.start_bound();
let end = self.rows.end_bound();
let max = records.count_rows();
let (rows_start, rows_end) = bounds_to_usize(start, end, max);
let start = self.columns.start_bound();
let end = self.columns.end_bound();
let max = records.count_columns();
let (cols_start, cols_end) = bounds_to_usize(start, end, max);
SectorIter::new(rows_start, rows_end, cols_start, cols_end)
}
}
/// This is a segment which contains all cells on the table.
///
/// Can be created from [`Segment::all`].
#[derive(Debug)]
pub struct SegmentAll;
impl<I> Object<I> for SegmentAll {
type Iter = EntityOnce;
fn cells(&self, _: &I) -> Self::Iter {
EntityOnce::new(Some(Entity::Global))
}
}
/// An [`Iterator`] which goes goes over all cell in a sector in a [`Table`].
///
/// [`Table`]: crate::Table
#[derive(Debug)]
pub struct SectorIter {
iter: SectorCellsIter,
}
impl SectorIter {
const fn new(rows_start: usize, rows_end: usize, cols_start: usize, cols_end: usize) -> Self {
Self {
iter: SectorCellsIter::new(rows_start, rows_end, cols_start, cols_end),
}
}
}
impl Iterator for SectorIter {
type Item = Entity;
fn next(&mut self) -> Option<Self::Item> {
let (row, col) = self.iter.next()?;
Some(Entity::Cell(row, col))
}
}
#[derive(Debug)]
pub(crate) struct SectorCellsIter {
rows_end: usize,
cols_start: usize,
cols_end: usize,
row: usize,
col: usize,
}
impl SectorCellsIter {
/// Create an iterator from 1st row to last from 1st col to last.
pub(crate) const fn new(
rows_start: usize,
rows_end: usize,
cols_start: usize,
cols_end: usize,
) -> Self {
Self {
rows_end,
cols_start,
cols_end,
row: rows_start,
col: cols_start,
}
}
}
impl Iterator for SectorCellsIter {
type Item = (usize, usize);
fn next(&mut self) -> Option<Self::Item> {
if self.row >= self.rows_end {
return None;
}
if self.col >= self.cols_end {
return None;
}
let row = self.row;
let col = self.col;
self.col += 1;
if self.col == self.cols_end {
self.row += 1;
self.col = self.cols_start;
}
Some((row, col))
}
}
|
