338 lines
11 KiB
Rust
338 lines
11 KiB
Rust
//! Random trees, checked against building the same tree cold.
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//!
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//! A frame reaches its layout by keeping most of the last one: slots
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//! rewritten, some widgets drawn again, the rest untouched. The property here
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//! is that what comes out is the tree a cold start would have produced, so
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//! anything the retained path carried over that it should not have shows up
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//! as a difference in somebody's box.
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//!
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//! `iris::random` grows the tree and `examples/random.rs` draws one. A seed is
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//! the whole reproduction; `a_long_run_of_seeds_agrees` is the ignored sweep
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//! for when it is worth spending the time.
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use std::collections::HashMap;
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use iris::harness::Harness;
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use iris::prelude::*;
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use iris::random::{Edits, Lens, Rng, SpanEdit, Tree, grow};
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const DEPTH: usize = 4;
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const SEEDS: [u64; 7] = [1, 2, 3, 5, 8, 13, 98];
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const REGION_EPSILON_PX: f32 = 0.05;
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fn same_coordinate(got: f32, want: f32) -> bool {
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(got - want).abs() <= REGION_EPSILON_PX
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}
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fn same_region(got: Option<PixelRegion>, want: Option<PixelRegion>) -> bool {
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match (got, want) {
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(Some(got), Some(want)) => {
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same_coordinate(got.top_left.x, want.top_left.x)
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&& same_coordinate(got.top_left.y, want.top_left.y)
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&& same_coordinate(got.bot_right.x, want.bot_right.x)
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&& same_coordinate(got.bot_right.y, want.bot_right.y)
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}
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(None, None) => true,
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_ => false,
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}
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}
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fn plant(h: &mut Harness, seed: u64, edits: &Edits) -> Tree {
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let (root, tree) = grow(&mut h.rsc, seed, DEPTH, edits);
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h.state.root = Some(root);
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h.frame();
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tree
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}
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/// Changes a few of the declared sizes, and says which, so the cold tree can
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/// be grown with the same ones.
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fn edit(h: &mut Harness, tree: &Tree, rng: &mut Rng) -> HashMap<usize, Lens> {
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let mut edits = HashMap::new();
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for _ in 0..4 {
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let idx = rng.below(tree.sized.len());
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let lens = [
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Some(Len::abs(20.0 + rng.below(180) as f32)),
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Some(Len::abs(20.0 + rng.below(180) as f32)),
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];
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edits.insert(idx, lens);
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let sized = &mut h.rsc[tree.sized[idx]];
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sized.x = lens[0];
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sized.y = lens[1];
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}
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edits
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}
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/// A way of changing what a span holds. Each is a shape worth its own case:
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/// taking a child out of the middle is not the same as emptying a span, and
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/// adding one is not the same as adding three.
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#[derive(Clone, Copy, Debug)]
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enum Shuffle {
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/// Every other child, so what is left is interleaved with what went.
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EveryOther,
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/// Everything but the first, which is the last step before empty.
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AllButFirst,
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/// Three more on the end at once.
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AddThree,
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/// The first out and three more on, so the count moves both ways.
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SwapForThree,
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/// One out of the middle and one on the end.
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TradeOne,
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}
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const SHUFFLES: [Shuffle; 5] = [
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Shuffle::EveryOther,
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Shuffle::AllButFirst,
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Shuffle::AddThree,
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Shuffle::SwapForThree,
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Shuffle::TradeOne,
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];
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impl Shuffle {
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fn of(self, grown: usize) -> SpanEdit {
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let all = |step: usize, from: usize| (from..grown).step_by(step).collect();
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match self {
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Self::EveryOther => SpanEdit {
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detach: all(2, 0),
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attach: 0,
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},
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Self::AllButFirst => SpanEdit {
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detach: all(1, 1),
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attach: 0,
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},
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Self::AddThree => SpanEdit {
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detach: Vec::new(),
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attach: 3,
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},
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Self::SwapForThree => SpanEdit {
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detach: vec![0],
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attach: 3,
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},
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Self::TradeOne => SpanEdit {
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detach: vec![grown / 2],
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attach: 1,
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},
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}
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}
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}
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/// Applies `shuffle` to every third span, and says what it did so the cold
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/// tree can be grown that way. The widgets it takes out are given back: the
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/// last share of one must outlive the comparison, or its id is handed to
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/// something else and the two trees stop lining up.
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fn reshuffle(
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h: &mut Harness,
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tree: &mut Tree,
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shuffle: Shuffle,
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) -> (HashMap<usize, SpanEdit>, Vec<StrongWidget>) {
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let mut edits = HashMap::new();
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let mut detached = Vec::new();
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for (idx, span) in tree.spans.iter_mut().enumerate().step_by(3) {
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let span_edit = shuffle.of(span.grown);
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let mut take = span_edit.detach.clone();
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take.sort_unstable();
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let children = &mut h.rsc[span.id].children;
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// Highest first, so an index means the same child however many of
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// its neighbours are going too.
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for j in take.into_iter().rev() {
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if j < children.len() {
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detached.push(children.remove(j));
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}
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}
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let attach = span_edit.attach.min(span.spares.len());
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children.extend(span.spares.drain(..attach));
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edits.insert(idx, span_edit);
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}
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(edits, detached)
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}
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/// Every widget in one tree against the matching widget in the other. A
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/// mismatch prints the widget's ancestry, marking the ones that own a slot,
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/// since where two trees disagree is rarely where the cause is.
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fn assert_same(seed: u64, what: &str, warm: (&Harness, &Tree), cold: (&Harness, &Tree)) {
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let ((wh, wt), (ch, ct)) = (warm, cold);
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assert_eq!(wt.ids.len(), ct.ids.len(), "seed {seed}: different trees");
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let mut drawn = 0;
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let mut wrong = 0;
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for (i, (&w, &c)) in wt.ids.iter().zip(&ct.ids).enumerate() {
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let (got, want) = (wh.region(&w), ch.region(&c));
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drawn += usize::from(got.is_some());
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// This oracle cares where rasterization lands, not whether equivalent
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// arithmetic produced the same f32. Keep the tolerance to one
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// twentieth of a physical pixel, while whether a widget drew remains
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// exact.
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if same_region(got, want) {
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continue;
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}
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wrong += 1;
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if wrong <= 3 {
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let mut chain = Vec::new();
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let mut at = Some(w);
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while let Some(id) = at {
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let active = &wh.render.active[&id];
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let slot = match active.move_idx == active.parent_move {
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true => "",
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false => "*",
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};
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chain.push(format!("{}{slot}", wh.rsc.widgets().label(id)));
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at = active.parent;
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}
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println!(
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"seed {seed} after {what}: widget {i}\n warm {got:?}\n cold {want:?}\n {}",
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chain.join(" < ")
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);
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}
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}
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assert!(drawn > 0, "seed {seed}: nothing was drawn");
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assert_eq!(wrong, 0, "seed {seed}: {wrong} widgets differ after {what}");
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}
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fn changed_size(seed: u64) {
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let mut warm = Harness::new((900, 1200));
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let grown = plant(&mut warm, seed, &Edits::default());
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let mut rng = Rng::new(seed ^ 0x5eed);
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let sizes = edit(&mut warm, &grown, &mut rng);
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warm.frame();
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let mut cold = Harness::new((900, 1200));
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let same = plant(
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&mut cold,
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seed,
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&Edits {
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sizes,
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..Default::default()
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},
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);
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assert_same(seed, "a size change", (&warm, &grown), (&cold, &same));
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}
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fn reshuffled(seed: u64, shuffle: Shuffle) {
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let mut warm = Harness::new((900, 1200));
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let mut grown = plant(&mut warm, seed, &Edits::default());
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// Some seeds grow nothing but wrappers, and a shuffle with no span to
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// shuffle is not the same thing as one that had no effect.
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if grown.spans.is_empty() {
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return;
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}
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let before: Vec<_> = grown.ids.iter().map(|id| warm.region(id)).collect();
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let (spans, _held) = reshuffle(&mut warm, &mut grown, shuffle);
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warm.frame();
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// Or the two trees would agree for want of anything having happened.
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let after = grown.ids.iter().map(|id| warm.region(id));
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let moved = before.iter().zip(after).filter(|(a, b)| *a != b).count();
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assert!(moved > 0, "seed {seed}: {shuffle:?} changed nothing");
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let mut cold = Harness::new((900, 1200));
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let same = plant(
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&mut cold,
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seed,
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&Edits {
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spans,
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..Default::default()
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},
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);
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let what = format!("{shuffle:?}");
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assert_same(seed, &what, (&warm, &grown), (&cold, &same));
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}
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fn resized(seed: u64) {
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let mut warm = Harness::new((1920, 1200));
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let grown = plant(&mut warm, seed, &Edits::default());
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warm.resize((640, 900));
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warm.frame();
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let mut cold = Harness::new((640, 900));
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let same = plant(&mut cold, seed, &Edits::default());
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assert_same(seed, "a resize", (&warm, &grown), (&cold, &same));
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}
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fn resized_then_changed(seed: u64) {
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let mut warm = Harness::new((1920, 1200));
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let grown = plant(&mut warm, seed, &Edits::default());
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warm.resize((640, 900));
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warm.frame();
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let mut rng = Rng::new(seed ^ 0xb0a7);
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let sizes = edit(&mut warm, &grown, &mut rng);
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warm.frame();
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let mut cold = Harness::new((640, 900));
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let same = plant(
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&mut cold,
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seed,
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&Edits {
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sizes,
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..Default::default()
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},
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);
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let what = "a resize then a size change";
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assert_same(seed, what, (&warm, &grown), (&cold, &same));
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}
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#[test]
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fn a_changed_size_lands_where_growing_it_that_way_would() {
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SEEDS.into_iter().for_each(changed_size);
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}
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#[test]
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fn a_resize_lands_where_starting_at_that_size_would() {
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SEEDS.into_iter().for_each(resized);
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}
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#[test]
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fn a_size_change_after_a_resize_lands_the_same_way() {
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SEEDS.into_iter().for_each(resized_then_changed);
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}
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#[test]
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fn adding_and_removing_span_children_lands_where_growing_it_that_way_would() {
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for shuffle in SHUFFLES {
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for seed in SEEDS {
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reshuffled(seed, shuffle);
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}
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}
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}
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/// Reproduces a divergence that predates the position chain: laying a tree out
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/// again does not always land where growing it cold does.
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///
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/// Every one seen so far is a wrapping text on a span's *own* axis, where the
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/// two draws do not agree. The span measures the child in the whole box, the
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/// child shapes to that width and reports the width it used, the span then
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/// places it in exactly that width -- which is a length change, so the child
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/// shapes again, and its longest line is shorter than the box it was just
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/// given. Each pass narrows it, so where the tree ends up depends on how many
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/// passes it has had, and a warm tree has had a different number from a cold
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/// one. Layout is supposed to be a function of the state alone.
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///
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/// A span whose axis is not the wrap axis is stable, which is every real
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/// column of text, and why nothing else has run into this.
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///
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/// 7 of these 90 diverge on `db1751f`, before the chain; 30 do with it, since
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/// a placed child reaches the second shaping more often. Both numbers are the
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/// same defect, and it wants fixing where the two draws meet -- LAYOUT.md §4 --
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/// rather than anywhere in the chain.
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#[test]
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#[ignore = "a hundred seeds, rather than the seven the others check"]
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fn a_long_run_of_seeds_agrees() {
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let seeds = std::env::var("IRIS_GENERATED_SEED")
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.ok()
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.and_then(|seed| seed.parse().ok())
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.map(|seed| seed..=seed)
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.unwrap_or(1..=100);
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for seed in seeds {
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changed_size(seed);
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resized(seed);
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resized_then_changed(seed);
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for shuffle in SHUFFLES {
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reshuffled(seed, shuffle);
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}
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}
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}
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