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//! A Renderer builds `Blocks` from provided intervals and render them.
use crate::blocks::build_blocks;
use crate::interval::{boundaries, is_empty, is_finite, split_overlapping, union, TBLInterval};
use crate::rendering::{render_blocks, render_default, DEFAULT_LENGTH};
use crate::{Block, Bound, RenderBlock, TBLError};
use itertools::Itertools;
use std::fmt::Debug;
/// Render intervals.
///
/// L is the type of labels used by the `BlockRenderer`.
pub struct Renderer<'a, L>
where
L: Clone + Debug,
{
length: usize,
intervals: Vec<TBLInterval<L>>,
renderer: &'a dyn Fn(&Block<L>) -> RenderBlock,
boundaries: Option<Bound>,
}
impl<'a, L> Renderer<'a, L>
where
L: Clone + Debug,
{
/// Returns a `Renderer` with default length and default `BlockRenderer<_>`.
///
/// `fb` returns a `Bound` for an interval of type `T`
///
/// `fl` returns an optional `label: L` for an interval of type `T`
///
/// ```
/// use tbl::{Bound, Renderer};
/// let data: Vec<Bound> = vec![(1., 2.), (3., 4.)]; // T = (f64, f64)
/// let rendered = Renderer::new(data.as_slice(), &|&e| e, &|_| None::<String>) // L = String
/// .with_length(6)
/// .render();
/// for line in rendered.unwrap().iter().flatten() {
/// assert_eq!(line, "== ==");
/// }
/// ```
pub fn new<T>(
intervals: &[T],
fb: &dyn Fn(&T) -> Bound,
fl: &dyn Fn(&T) -> Option<L>,
) -> Renderer<'a, L> {
Renderer {
length: DEFAULT_LENGTH,
intervals: intervals
.iter()
.map(|interval| TBLInterval::new(fb(interval), fl(interval)))
.collect(),
renderer: &render_default,
boundaries: None,
}
}
/// Configure `Renderer` length (output line length)
///
/// ```
/// use tbl::{Bound, Renderer};
/// let data: Vec<Bound> = vec![(1., 2.)];
/// let rendered = Renderer::new(data.as_slice(), &|&e| e, &|_| None::<String>)
/// .with_length(6)
/// .render();
/// for line in rendered.unwrap().iter().flatten() {
/// assert_eq!(line, "======");
/// }
/// let rendered = Renderer::new(data.as_slice(), &|&e| e, &|_| None::<String>)
/// .with_length(8)
/// .render();
/// for line in rendered.unwrap().iter().flatten() {
/// assert_eq!(line, "========");
/// }
/// ```
pub fn with_length(&'a mut self, length: usize) -> &'a mut Renderer<'a, L> {
self.length = length;
self
}
/// Configure `Renderer` intervals boundaries.
///
/// if provided boundaries is not a sub-boundary of provided intervals then
/// output is padded left and right (if necessary) to fit the provided boundary.
///
/// ```
/// use tbl::{Bound, Renderer};
/// let data: Vec<Bound> = vec![(1., 2.), (3., 4.)];
/// let rendered = Renderer::new(data.as_slice(), &|&e| e, &|_| None::<String>)
/// .with_length(6)
/// .render();
/// for line in rendered.unwrap().iter().flatten() {
/// assert_eq!(line, "== ==");
/// }
/// let rendered = Renderer::new(data.as_slice(), &|&e| e, &|_| None::<String>)
/// .with_length(10)
/// .with_boundaries((0., 5.))
/// .render();
/// for line in rendered.unwrap().iter().flatten() {
/// assert_eq!(line, " == == ");
/// }
/// ```
pub fn with_boundaries(&'a mut self, boundaries: Bound) -> &'a mut Renderer<'a, L> {
self.boundaries = Some(boundaries);
self
}
/// Provide a custom renderer
///
/// ```
/// use tbl::{Block, RenderBlock, Bound, Renderer};
///
/// fn render(b: &Block<String>) -> RenderBlock {
/// match b {
/// Block::Space(length) => RenderBlock::Space("\u{2606}".repeat(*length)),
/// Block::Segment(length, label) => {
/// let mut truncated = label.clone().unwrap_or_default();
/// truncated.truncate(*length);
/// RenderBlock::Block(format!(
/// "{}{}",
/// truncated,
/// "\u{2605}".repeat(*length - truncated.len())
/// ))
/// }
/// }
/// }
/// let data: Vec<Bound> = vec![(1., 2.), (3., 4.)];
/// let rendered = Renderer::new(data.as_slice(), &|&e| e, &|e| {
/// Some(format!("{:?}", e))
/// })
/// .with_length(60)
/// .with_renderer(&render)
/// .render();
/// for line in rendered.unwrap().iter().flatten() {
/// assert_eq!(line, "(1.0, 2.0)★★★★★★★★★★☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆(3.0, 4.0)★★★★★★★★★★");
/// }
/// ```
pub fn with_renderer(
&'a mut self,
renderer: &'a dyn Fn(&Block<L>) -> RenderBlock,
) -> &'a mut Renderer<'a, L> {
self.renderer = renderer;
self
}
/// Render intervals as a `Vec<Vec<String>>`.
///
/// 1. Overlapping intervals are split into non overlapping subsets.
/// 2. Each subset is rendered as a potentialy multiline timeline: `Vec<String>`
///
/// ie `Vec<Vec<String>>` is a vec of (multiline) timelines.
///
/// ```
/// use tbl::{Bound, Renderer};
/// let data: Vec<Bound> = vec![(1., 2.), (3., 4.)]; // T = (f64, f64)
/// let rendered = Renderer::new(data.as_slice(), &|&e| e, &|_| None::<String>) // L = String
/// .with_length(6)
/// .render();
/// for line in rendered.unwrap().iter().flatten() {
/// assert_eq!(line, "== ==");
/// }
/// ```
pub fn render(&self) -> Result<Vec<Vec<String>>, TBLError<L>> {
let sorted_intervals: Vec<TBLInterval<L>> = self
.intervals
.iter()
.filter(|interval| is_finite(interval))
.filter(|interval| !is_empty(interval))
.sorted()
.cloned()
.collect();
let boundaries = match (boundaries(sorted_intervals.as_slice()), self.boundaries) {
(None, _) => self.boundaries,
(Some(b), None) => Some(b),
(Some(b), Some(other)) => Some(union(&b, &other)),
};
let non_overlapping_subsets = split_overlapping(sorted_intervals.as_slice());
let rendered: Vec<Vec<String>> = non_overlapping_subsets
.iter()
.map(
|intervals| match build_blocks(intervals.as_slice(), self.length, boundaries) {
Err(e) => Err(e),
Ok(blocks) => {
let blocks: Vec<Block<L>> =
blocks.iter().map(|b| Block::from(b.clone())).collect();
let rendered = render_blocks(blocks.as_slice(), self.renderer);
let rendered = rendered
.iter()
.map(|v| v.iter().map(String::from).collect())
.collect::<Vec<String>>();
Ok(rendered)
}
},
)
.collect::<Result<Vec<Vec<String>>, TBLError<L>>>()?;
Ok(rendered)
}
}