diff --git a/Cargo.lock b/Cargo.lock index 49ebbd0..cb20006 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -1280,6 +1280,8 @@ dependencies = [ "epiphany-bundle", "epiphany-core", "epiphany-determinism", + "epiphany-editor-core", + "epiphany-engrave", "epiphany-layout-ir", "epiphany-ops", ] diff --git a/crates/epiphany-editor-core/src/lib.rs b/crates/epiphany-editor-core/src/lib.rs index db320df..e2c9f46 100644 --- a/crates/epiphany-editor-core/src/lib.rs +++ b/crates/epiphany-editor-core/src/lib.rs @@ -65,7 +65,7 @@ use epiphany_core::{ use epiphany_layout_ir::{ active_clef, manifestation_layout_id, staff_step_pitch, to_constrained, to_logical, to_render, ConstraintSolver, ExtensionRef, HitTestMap, LayoutContent, LayoutObjectId, LogicalLayoutIR, - Point, RenderIR, ResolvedLayoutIR, SolverConfig, TimePoint, + Point, Rect, RenderIR, ResolvedLayoutIR, ResolvedSystem, SolverConfig, TimePoint, }; use epiphany_ops::{ advisory_violations, AcceptOutcome, AuthorId, CausalContext, DeleteEventOp, @@ -543,14 +543,23 @@ impl EditorSession { }) } - /// The manifested staff a world `point` is nearest, by 2D proximity — its - /// `(region, staff instance)` and the staff's step-origin `y`. Horizontal span - /// first (which region — one staff tiles across regions that can share a y band), - /// then the vertical band (which staff within it). The bottom staff line carries - /// the staff's manifestation id as its stroke `stable_id`, which is how a rendered - /// line maps back to `(region, staff_instance)`. Both halves of click-to-insert — - /// [`Self::staff_pitch_at`] (pitch) and [`Self::position_at`] (position) — select - /// the staff/region through this. `None` on a non-finite point or no staff line. + /// The manifested staff a world `point` is nearest — its `(region, staff + /// instance)` and the staff's step-origin `y`. Both halves of click-to-insert — + /// [`Self::staff_pitch_at`] (pitch) and [`Self::position_at`] (position) — + /// select the staff/region through this. `None` on a non-finite point or no + /// staff line. + /// + /// When the layout carries real cast-off page geometry, the staff is resolved + /// *within the system under the click* ([`Self::system_manifestation`]): + /// casting-off splits a staff's lines per system, and only the first segment + /// keeps the manifestation `stable_id`, so the flat scan below would always + /// answer with system 1's origin/span. Without cast geometry (a solver that + /// does not cast off, e.g. the stub), the flat scan is the whole story: + /// horizontal span first (which region — one staff tiles across regions that + /// can share a y band), then the vertical band (which staff within it). The + /// bottom staff line carries the staff's manifestation id as its stroke + /// `stable_id`, which is how a rendered line maps back to + /// `(region, staff_instance)`. fn nearest_manifestation(&self, point: Point) -> Option<(RegionId, &StaffInstance, f32)> { // Reject a non-finite click up front: `dist_to_band`'s `<`/`>` would let a // NaN fall through as distance 0 (matching every staff), and downstream a @@ -559,8 +568,9 @@ impl EditorSession { if !point.x.0.is_finite() || !point.y.0.is_finite() { return None; } - // A 5-line staff spans four staff spaces above its bottom line. - const STAFF_SPAN: f32 = 4.0; + if let Some(found) = self.system_manifestation(point) { + return Some(found); + } let mut best: Option<(RegionId, &StaffInstance, f32)> = None; let mut best_dist = (f32::INFINITY, f32::INFINITY); for (region, si) in self.score.staff_instances() { @@ -592,14 +602,114 @@ impl EditorSession { best } + /// The manifested staff under `point`, resolved through the cast-off page tree + /// — the multi-system path of [`Self::nearest_manifestation`]. Finds the system + /// under the click ([`Self::containing_system`]), reads the region it manifests + /// from its provenance, picks the vertically nearest staff band among the + /// system's staff records, and recovers that staff's step origin **in this + /// system**. `None` when no system carries real geometry (the caller then falls + /// back to the flat stroke scan), or when the containing system carries no + /// usable staff record. + fn system_manifestation(&self, point: Point) -> Option<(RegionId, &StaffInstance, f32)> { + let system = self.containing_system(point)?; + // A system manifests one region, and carries it as its provenance source + // whether it is the region's first system (the region's own provenance) or + // a later one (synthesized under `EngravedBreak` *from the region*) — read + // the identity from the data rather than assuming which system this is. + let TypedObjectId::Region(region) = system.provenance.source else { + return None; + }; + // The nearest staff band vertically: within one system the region is fixed, + // and its staves are stacked in disjoint y bands, so — unlike the flat + // scan, where x picks the region first — the vertical distance alone is + // the discriminator. + let staff = system + .staves + .iter() + .filter(|s| rect_is_real(&s.bounding_box)) + .min_by(|a, b| { + let da = dist_to_band(point.y.0, rect_y_band(&a.bounding_box)); + let db = dist_to_band(point.y.0, rect_y_band(&b.bounding_box)); + da.total_cmp(&db) + })?; + // The staff record's provenance is its bottom-most rendered line *in this + // system* (`build_system` in the engraver's casting pass); that stroke's + // height is the exact step origin the pitch math expects. Fall back to + // deriving it from the staff's box, whose vertical extent is the 5-line + // span padded by the line half-thickness on both sides — the bottom line + // sits half the (span + padding) height above the box bottom, minus half + // the span. + let origin = self + .resolved + .strokes + .iter() + .find(|s| s.provenance.stable_id == staff.provenance.stable_id) + .map(|s| s.from.y.0) + .unwrap_or_else(|| { + let b = &staff.bounding_box; + b.origin.y.0 + b.size.height.0 / 2.0 - STAFF_SPAN / 2.0 + }); + let si = self + .score + .staff_instances() + .find(|(r, si)| *r == region && si.staff == staff.staff) + .map(|(_, si)| si)?; + Some((region, si, origin)) + } + + /// The cast-off system whose bounding box contains `point`, or — when the + /// point is in the gutter between systems — the **nearest system by vertical + /// distance**: systems on a page all start at the left margin, so they overlap + /// in x and are disjoint in y, making the y band the discriminator (and a + /// click slightly above/below a system still resolves, mirroring the flat + /// path's nearest-staff tolerance). Only a system with real (non-degenerate) + /// geometry is a candidate: a solver that does not cast off (the stub) emits + /// zero-size boxes, and those must not capture clicks — `None` sends the + /// caller down the flat single-system path unchanged. + fn containing_system(&self, point: Point) -> Option<&ResolvedSystem> { + if !point.x.0.is_finite() || !point.y.0.is_finite() { + return None; + } + let mut nearest: Option<&ResolvedSystem> = None; + let mut nearest_dy = f32::INFINITY; + for system in self.resolved.pages.iter().flat_map(|p| p.systems.iter()) { + let bounds = &system.bounding_box; + if !rect_is_real(bounds) { + continue; + } + if rect_contains(bounds, point) { + return Some(system); + } + let dy = dist_to_band(point.y.0, rect_y_band(bounds)); + // Strict `<`: on a tie, the earlier system in page/reading order wins + // (deterministic, and the gutter midpoint resolves upward). + if dy < nearest_dy { + nearest_dy = dy; + nearest = Some(system); + } + } + nearest + } + /// The musical position a world `point` snaps to on the beat grid — the /// **horizontal half** of a click-to-insert. Finds the metric region under the /// cursor, inverts the click's `x` to a raw musical position (piecewise-linear /// through the region's rendered event anchors), then snaps it to `grid`. `None` /// if the click is off any staff, the region is non-metric (a proportional or /// aleatoric region has no musical position to land on), `grid` is non-positive, - /// or the region has fewer than two rendered metric events to fix a scale from. + /// or there are fewer than two rendered metric events to fix a scale from. /// The vertical half (the pitch) is [`Self::staff_pitch_at`]. + /// + /// In a cast-off multi-system layout the inverse works **within the system + /// under the click**: each system restarts at the page's left margin, so one x + /// names a different time on each system. A click right of a system's last + /// anchor extrapolates that system's end segment (the empty staff after its + /// last note — the same end-extrapolation as the flat layout, and it may name + /// a time that *renders* on the next system: the result is a musical position, + /// not a system-local one); a click left of its first anchor extrapolates + /// backward and clamps at the region origin; and a system rendering fewer than + /// two of the region's anchors yields `None`, the per-system reading of the + /// two-anchor rule above. pub fn position_at(&self, point: Point, grid: &GridResolution) -> Option { if !grid.step.is_positive() { return None; @@ -610,9 +720,16 @@ impl EditorSession { if !self.region_is_metric(region) { return None; } + // Constrain the anchors to the system under the click: casting-off bakes + // every system back to the left margin, so the region-wide anchor list is + // x-non-monotonic in time, and inverting through it would map a later + // system's click onto the first system's times. Without cast geometry + // (`containing_system` is `None` — the stub) the whole region is one flat + // monotonic run, unchanged. + let system_box = self.containing_system(point).map(|s| s.bounding_box); // Two anchors fix the x→time scale; with fewer, the spacing density is // unknown, so there is nothing to extrapolate an empty-space position from. - let anchors = self.position_anchors(region); + let anchors = self.position_anchors(region, system_box.as_ref()); if anchors.len() < 2 { return None; } @@ -672,7 +789,17 @@ impl EditorSession { /// in ascending time order — the samples the horizontal inverse interpolates. A /// glyph maps to its onset through its `Pitch`/`Event` provenance source; the /// leftmost glyph at an onset (the notehead/stem column) fixes that onset's x. - fn position_anchors(&self, region: RegionId) -> Vec<(MusicalPosition, f32)> { + /// + /// With `within` (a cast-off system's bounding box), only glyphs positioned + /// inside that box are sampled: casting-off restarts every system at the left + /// margin, so the region-wide list is x-non-monotonic in time, and the inverse + /// must see a single system's monotonic run. `None` samples the whole region — + /// the flat single-system behavior. + fn position_anchors( + &self, + region: RegionId, + within: Option<&Rect>, + ) -> Vec<(MusicalPosition, f32)> { // Source id (event or one of its pitches) → the event's metric onset. let mut onset: HashMap = HashMap::new(); let mut pitches: Vec<&IdentifiedPitch> = Vec::new(); @@ -705,6 +832,11 @@ impl EditorSession { if glyph.provenance.synthesis.is_some() { continue; } + // Constrain to the requested system's box: a glyph on another system + // must not contribute an anchor to this system's monotonic run. + if within.is_some_and(|bounds| !rect_contains(bounds, glyph.position)) { + continue; + } if let Some(at) = onset.get(&glyph.provenance.source) { let x = glyph.position.x.0; by_onset @@ -1995,6 +2127,9 @@ fn staff_step(pitch: &Pitch, steps: i32) -> Option { Some(moved) } +/// A 5-line staff spans four staff spaces above its bottom line. +const STAFF_SPAN: f32 = 4.0; + /// The distance from height `y` to a staff's line band `(bottom, top)`: zero inside /// the band, else the gap to the nearer edge. Used to pick the staff a click is over. fn dist_to_band(y: f32, (bottom, top): (f32, f32)) -> f32 { @@ -2007,6 +2142,35 @@ fn dist_to_band(y: f32, (bottom, top): (f32, f32)) -> f32 { } } +/// Whether a resolved bounding box carries **real** cast-off geometry: finite +/// origin and strictly positive extent on both axes. A solver that does not cast +/// off (the stub) emits `Rect::default()` — zero-size — boxes, which must not +/// capture clicks; the callers fall back to the flat single-system paths instead. +fn rect_is_real(rect: &Rect) -> bool { + let width = rect.size.width.0; + let height = rect.size.height.0; + rect.origin.x.0.is_finite() + && rect.origin.y.0.is_finite() + && width.is_finite() + && height.is_finite() + && width > 0.0 + && height > 0.0 +} + +/// A rect's vertical band as `(bottom, top)`, the shape [`dist_to_band`] takes. +fn rect_y_band(rect: &Rect) -> (f32, f32) { + (rect.origin.y.0, rect.origin.y.0 + rect.size.height.0) +} + +/// Whether `point` lies within `rect`, edges included (a glyph exactly on a +/// system's edge belongs to that system). +fn rect_contains(rect: &Rect, point: Point) -> bool { + point.x.0 >= rect.origin.x.0 + && point.x.0 <= rect.origin.x.0 + rect.size.width.0 + && point.y.0 >= rect.origin.y.0 + && point.y.0 <= rect.origin.y.0 + rect.size.height.0 +} + /// Inverts an `x` coordinate to a raw musical position through `(onset, x)` anchors /// in ascending order (`>= 2`, leftmost first) — the horizontal inverse before grid /// snapping. Within the anchored span it interpolates the bracketing segment; outside @@ -2734,6 +2898,13 @@ mod tests { } /// `region`'s rendered bottom staff line as `(left_x, right_x, origin_y)`. + /// + /// **Flat-layout (stub) helper**: it finds the stroke carrying the staff's + /// manifestation id, which in a cast-off layout is only the *first* system's + /// segment. Every test here runs on the [`StubSolver`], which never splits a + /// line, so the first segment is the whole line; multi-system geometry is + /// exercised via [`install_two_system_geometry`] and, over the real engraver, + /// by the testkit's `multisystem_click` integration test. fn region_staff_line(session: &EditorSession, region: RegionId) -> (f32, f32, f32) { let (_, si) = session .score() @@ -2765,7 +2936,7 @@ mod tests { fn position_at_snaps_a_click_to_the_beat_grid() { let session = open_rich(0x5EED); let region = a_region_with(&session, true); - let anchors = session.position_anchors(region); + let anchors = session.position_anchors(region, None); assert!( anchors.len() >= 2, "the metric region renders multiple notes" @@ -2861,7 +3032,7 @@ mod tests { // The onset's anchor must be the notehead x, not the (leftmost) accidental // — the exact check, independent of how coarse the grid is. let anchor_x = session - .position_anchors(region) + .position_anchors(region, None) .into_iter() .find(|(o, _)| o == onset) .map(|(_, x)| x) @@ -2916,6 +3087,293 @@ mod tests { assert_eq!(session.position_at(at, &zero), None); } + /// Where [`install_two_system_geometry`] puts each system's staff bottom line + /// (the step origin), in world y: system 1 on top, system 2 below it. + const SYS1_ORIGIN_Y: f32 = 0.0; + const SYS2_ORIGIN_Y: f32 = -20.0; + + /// Overwrites `session`'s resolved geometry with a hand-built **two-system + /// cast-off layout** over its single metric region — the shape the real + /// engraver produces and the stub never does. The first half of the region's + /// onsets renders on system 1, the rest on system 2; both systems start at the + /// same left margin (x restarts, so the region-wide anchor list is + /// x-non-monotonic in time) and sit in disjoint y bands. Each system carries a + /// staff record whose provenance is its own bottom-line stroke — system 1 the + /// staff's manifestation provenance, system 2 a synthesized continuation — + /// exactly as the engraver's casting pass writes them. Only the resolved + /// geometry is replaced (render/hit-test stay the stub's): these tests + /// exercise the resolved-geometry queries alone. + /// + /// Returns the region, each event as `(onset, anchor x, system index)` in + /// onset order, and the two system bounding boxes. + fn install_two_system_geometry( + session: &mut EditorSession, + ) -> (RegionId, Vec<(MusicalPosition, f32, usize)>, Rect, Rect) { + use epiphany_layout_ir::{ + BoundingBox, GlyphReference, GlyphStyle, Margins, Provenance, ResolvedGlyph, + ResolvedPage, ResolvedStaff, Size2D, StaffSpace, Stroke, SynthesisInstanceKey, + SynthesisKind, + }; + + let region = a_region_with(session, true); + let staff = session + .score() + .staff_instances() + .find(|(r, _)| *r == region) + .map(|(_, si)| si.staff) + .expect("the metric region has a staff instance"); + let events = region_pitched_events(session, region); + assert!( + events.len() >= 4, + "four onsets give each system two anchors to fix a scale" + ); + assert!( + events.windows(2).all(|w| w[0].0 < w[1].0), + "onsets are strictly ascending (distinct)" + ); + let half = events.len() / 2; + + let staff_source = TypedObjectId::Staff(staff); + // System 1 keeps the staff's manifestation provenance; system 2's line is + // an engraver-synthesized continuation with its own stable id — the split + // casting-off performs on a system-spanning stroke. + let line_provenance = [ + Provenance::manifested(staff_source, region, vec![]), + Provenance::synthesized( + staff_source, + SynthesisKind::EngravedBreak, + SynthesisInstanceKey(1), + vec![], + ), + ]; + let origins = [SYS1_ORIGIN_Y, SYS2_ORIGIN_Y]; + + let systems: Vec = origins + .iter() + .zip(&line_provenance) + .enumerate() + .map(|(s, (&origin, provenance))| ResolvedSystem { + provenance: if s == 0 { + Provenance::projected(TypedObjectId::Region(region), vec![]) + } else { + Provenance::synthesized( + TypedObjectId::Region(region), + SynthesisKind::EngravedBreak, + SynthesisInstanceKey(2), + vec![], + ) + }, + bounding_box: Rect { + origin: Point::new(0.0, origin - 2.0), + size: Size2D { + width: StaffSpace(90.0), + height: StaffSpace(STAFF_SPAN + 4.0), + }, + }, + staves: vec![ResolvedStaff { + provenance: provenance.clone(), + staff, + bounding_box: Rect { + origin: Point::new(0.0, origin - 0.05), + size: Size2D { + width: StaffSpace(88.0), + height: StaffSpace(STAFF_SPAN + 0.1), + }, + }, + }], + measures: Vec::new(), + }) + .collect(); + let strokes: Vec = origins + .iter() + .zip(&line_provenance) + .map(|(&y, provenance)| Stroke { + provenance: provenance.clone(), + from: Point::new(0.0, y), + to: Point::new(88.0, y), + thickness: StaffSpace(0.1), + layer: 0, + style: GlyphStyle::default(), + }) + .collect(); + + let mut placed: Vec<(MusicalPosition, f32, usize)> = Vec::new(); + let glyphs: Vec = events + .iter() + .enumerate() + .map(|(i, (onset, pid))| { + let system = usize::from(i >= half); + let local = if system == 0 { i } else { i - half }; + // 20 staff spaces per quarter, both systems restarting at x = 10. + let x = 10.0 + 20.0 * local as f32; + placed.push((onset.clone(), x, system)); + ResolvedGlyph { + provenance: Provenance::manifested(TypedObjectId::Pitch(*pid), region, vec![]), + glyph: GlyphReference::borrowed("noteheadBlack"), + position: Point::new(x, origins[system] + 1.0), + transform: None, + bounding_box: BoundingBox::new(0.0, -0.5, 1.2, 0.5), + style: GlyphStyle::default(), + layer: 0, + } + }) + .collect(); + + let (sys1_box, sys2_box) = (systems[0].bounding_box, systems[1].bounding_box); + session.resolved.pages = vec![ResolvedPage { + provenance: Provenance::projected(TypedObjectId::Region(region), vec![]), + number: 1, + size: Size2D::default(), + margins: Margins::default(), + systems, + free_objects: Vec::new(), + }]; + session.resolved.glyphs = glyphs; + session.resolved.strokes = strokes; + (region, placed, sys1_box, sys2_box) + } + + #[test] + fn containing_system_requires_real_cast_geometry() { + // The stub's page tree carries only degenerate (zero-size) system boxes: + // no system may capture a click, and the flat single-system path stays in + // charge — which is what keeps every pre-casting behavior unchanged. + let session = open_plain(1); + assert!( + !session.resolved().pages.is_empty(), + "the stub emits a page tree" + ); + assert!(session.containing_system(Point::new(1.0, 0.0)).is_none()); + let region = a_region_with(&session, true); + let at = point_on_region_staff(&session, region); + assert!( + session.staff_pitch_at(at).is_some(), + "the flat path still resolves the click" + ); + } + + #[test] + fn staff_pitch_at_reads_the_clicked_system_origin() { + let mut session = open_plain(1); + let (_region, _placed, sys1, sys2) = install_two_system_geometry(&mut session); + + // Same staff-relative height, one click per system: the pitch must match — + // system 2's step origin is its own bottom line, not system 1's. (The + // regression: only the first line segment keeps the manifestation stable + // id, so the flat path read every system-2 click against system 1's + // origin, ~20 staff spaces off.) + let p1 = session + .staff_pitch_at(Point::new(30.0, SYS1_ORIGIN_Y + 1.0)) + .expect("a staff under the system-1 click"); + let p2 = session + .staff_pitch_at(Point::new(30.0, SYS2_ORIGIN_Y + 1.0)) + .expect("a staff under the system-2 click"); + assert_eq!( + p1.staff_instance, p2.staff_instance, + "one staff, two systems" + ); + assert_eq!( + (p2.nominal, p2.octave), + (p1.nominal, p1.octave), + "the same staff-relative height names the same pitch in either system" + ); + + // The containing system is keyed on the click's y — full containment first… + let in_sys2 = session + .containing_system(Point::new(30.0, SYS2_ORIGIN_Y + 1.0)) + .expect("system 2 contains the point"); + assert_eq!(in_sys2.bounding_box, sys2); + // …and a click in the inter-system gutter resolves to the nearest system + // by vertical distance (mirroring the nearest-staff tolerance), never to + // nothing. + let just_under_sys1 = Point::new(30.0, rect_y_band(&sys1).0 - 1.0); + assert_eq!( + session + .containing_system(just_under_sys1) + .expect("the gutter still resolves") + .bounding_box, + sys1 + ); + let just_over_sys2 = Point::new(30.0, rect_y_band(&sys2).1 + 1.0); + assert_eq!( + session + .containing_system(just_over_sys2) + .expect("the gutter still resolves") + .bounding_box, + sys2 + ); + } + + #[test] + fn position_at_inverts_within_the_clicked_system() { + let mut session = open_plain(1); + let (region, placed, _sys1, sys2) = install_two_system_geometry(&mut session); + let half = placed.iter().filter(|(_, _, s)| *s == 0).count(); + // The fixture's onsets are consecutive quarters, so a quarter grid puts + // every rendered onset on the grid. + let quarter = grid(1, 4); + let step = MusicalDuration(RationalTime::new(1, 4).unwrap()); + + // Every anchor click snaps to its own onset — in both systems. + for (onset, x, system) in &placed { + let y = if *system == 0 { + SYS1_ORIGIN_Y + } else { + SYS2_ORIGIN_Y + } + 1.0; + let gp = session + .position_at(Point::new(*x, y), &quarter) + .expect("a metric position under the click"); + assert_eq!( + &gp.position, onset, + "the click snaps to the clicked system's onset" + ); + } + // The regression pinned directly: system 2's first anchor shares its x + // with system 1's first anchor but is a *later* time. + let (first_sys2_onset, x0, _) = placed[half].clone(); + let gp = session + .position_at(Point::new(x0, SYS2_ORIGIN_Y + 1.0), &quarter) + .expect("a metric position under the click"); + assert_eq!(gp.position, first_sys2_onset); + assert!( + gp.position > placed[0].0, + "a system-2 click is not a system-1 time" + ); + + // Anchor filtering: within system 2's box the run is monotonic in x and + // carries exactly the second half of the onsets; the unfiltered + // region-wide list is x-non-monotonic (the hazard the filter removes). + let filtered = session.position_anchors(region, Some(&sys2)); + assert_eq!(filtered.len(), placed.len() - half); + assert!(filtered.windows(2).all(|w| w[0].1 < w[1].1)); + assert_eq!(filtered[0].0, first_sys2_onset); + let flat = session.position_anchors(region, None); + assert_eq!(flat.len(), placed.len()); + assert!( + !flat.windows(2).all(|w| w[0].1 < w[1].1), + "the region-wide anchor list is x-non-monotonic across systems" + ); + + // End extrapolation stays within the clicked system: one anchor gap right + // of a system's last note is that system's next grid slot. For system 1 + // that names the time system 2 renders first — the result is a musical + // position, not a system-local one. + let (last_onset, last_x, _) = placed.last().cloned().unwrap(); + let past = session + .position_at(Point::new(last_x + 20.0, SYS2_ORIGIN_Y + 1.0), &quarter) + .expect("empty space past the last note still resolves"); + assert_eq!(past.position, last_onset + step.clone()); + let (sys1_last_onset, sys1_last_x, _) = placed[half - 1].clone(); + let hang = session + .position_at( + Point::new(sys1_last_x + 20.0, SYS1_ORIGIN_Y + 1.0), + &quarter, + ) + .expect("system 1's trailing space still resolves"); + assert_eq!(hang.position, sys1_last_onset + step); + } + #[test] fn position_at_rejects_non_finite_clicks() { let session = open_rich(0x5EED); @@ -3088,7 +3546,7 @@ mod tests { position: &MusicalPosition, y: f32, ) -> Point { - let anchors = session.position_anchors(region); + let anchors = session.position_anchors(region, None); let (p0, x0) = (anchors[0].0 .0.to_f64(), anchors[0].1 as f64); let last = anchors.last().unwrap(); let (p1, x1) = (last.0 .0.to_f64(), last.1 as f64); diff --git a/crates/epiphany-engrave/DECISIONS.md b/crates/epiphany-engrave/DECISIONS.md index e48e4f3..a016161 100644 --- a/crates/epiphany-engrave/DECISIONS.md +++ b/crates/epiphany-engrave/DECISIONS.md @@ -36,9 +36,12 @@ report `SolverTier::Stub`, never `Minimal` (Chapter 9 §"Conformance Tiers"). landed and now reports `Minimal` — which it fully earns after casting-off: the break constraint family is genuinely supported (spec §"Conformance Tiers", Minimal row), and `Minimal` makes no optimality claim, so greedy first-fit -casting-off is legitimate. The quality-metric vector stays the conservative -all-worst placeholder (`QualityMetricVector::unmeasured`) until the Quality Metric -Catalog lands (`Standard` tier work). +casting-off is legitimate. Since the Quality Metric Catalog companion's +ratification, the solve also reports a **real quality-metric vector** — +accurate metric vectors are part of the Minimal claim — computed per the +catalog's formulas (see "Quality metrics (2026-07)" below). The all-worst +placeholder (`QualityMetricVector::unmeasured`) remains only for malformed +inputs the solver cannot measure. ## Implementation decisions (QUICKSTART "Decisions you'll need to make") @@ -221,3 +224,106 @@ resolved: itself, not its artefacts). Carried as `Registered(SYSTEM_CONTINUATION_SYNTHESIS)`; the spec should either add a continuation kind or bless the registered id. + +## Quality metrics (2026-07) — decisions + +The Quality Metric Catalog companion (v0.1.0) ratified the nine normative +axes' formal definitions, anchors, thresholds, and the +`QualityFloorApproached` trigger; `Engraver::resolve` now computes the real +vector (the private `quality` module), replacing the all-worst placeholder. +The catalog's normative constants (anchors, the Minimal/Standard threshold +table, the 0.8 warning fraction, the tier/profile→column mappings) are +transcribed once in `epiphany_layout_ir::quality` and consumed here and by the +testkit's reference-suite harness. + +1. **Where each axis's inputs come from.** All nine are pure functions of the + constrained input, the cast layout, and the declared page geometry — data + the pipeline already had (see the `quality` module docs for the per-axis + map). The casting pass exposes its own glyph→system assignment + (`CastLayout::system_of_slot`, `region_of_system`) so the census ranges + over what the solve actually did, never a reconstruction. Slot identity + (the collision axis's same-column exclusion) is the glyph's + `horizontal_slot` in the constrained input, index-parallel to the resolved + glyph list. Widths/columns/densities use glyph **ink boxes** per the + catalog's measurement domain (strokes are not glyphs); page spans use the + resolved page tree's system bounding boxes. +2. **Vacuous axes.** `slur_shape_penalty` and `beam_slope_penalty` are exactly + `0.0`: the pipeline draws no slur or beam geometry (both exist logically, + not as curves/segments), so their contributing-unit sets are empty and the + catalog's vacuous-geometry rule (`req:qmc:vacuous`) applies. The catalog's + "notated-but-unrendered" open question explicitly owns this honesty edge; + the axes are wired so the first slur/beam-drawing release is measured from + day one. +3. **Vertical density's unit set.** `to_constrained` declares `InterStaffGap` + bands but **no** `InterSystemGap` bands (the casting pass reads + `VerticalBand::inter_system_gap` directly). Implemented units: (a) the + input's `InterStaffGap` bands, adjacency reconstructed from + `inter_staff_gap_id(region, g)` (gap *g* separates the region's staves + *g−1*/*g*), realized separation measured between the adjacent staff bands' + resolved ink extents within a common system — i.e. what the resolved + geometry actually shows, since constrained `y` is pass-through; (b) the + casting pass's realized inter-system gaps (consecutive systems on a page), + measured from the resolved page tree against the same constructor's + preferred height the stacking consulted. Today (b) measures realized ≡ + preferred (raw 0), and (a) is empty for every single-staff-per-region + score; a multi-staff region honestly measures ~1.0 because the constrained + stage's fixed 12-staff-space pitch is far from the band model's preferred + 2.0 gap — the metric is truthful, the vertical spring solve that would + negotiate it is the deferred work. +4. **Floor warnings never change the status.** Catalog + `req:qmc:floor-warning`: the `QualityFloorApproached` warning "is + diagnostic: emitting it does not change the solve's status". Implemented + literally: `status` is computed before the metric census, and quality + warnings are appended after — a solve with clean constraints stays + `Solved` even when it carries quality diagnostics. (This is also + load-bearing for downstream regression locks that assert `Solved` on + fixtures whose casting-off quality honestly warns.) The applicable + threshold column is the one the config's profile selects + (`profile_thresholds`: Draft→Minimal, Standard/Publication→Standard; + default profile Standard), so `SolverConfig` is now threaded into + `resolve`. +5. **Malformed inputs stay unmeasured.** A structurally invalid or + forged-catalog input has no trustworthy geometry (the census would sweep + unverified boxes), so it keeps `QualityMetricVector::unmeasured()` and + earns no floor diagnostics. An `Unsatisfiable` solve of a *valid* problem + is measured honestly — its real geometry exists. +6. **No-flip verification.** Existing tests asserting `Solved` on healthy + fixtures were re-run against the real metrics: none flipped (warnings + cannot flip status, and no metric enters the status computation). Two + engrave tests asserting `warnings.is_empty()` after an honoured break were + narrowed to "no `LargeSoftConstraintViolation`": their micro-fixtures + (two-note scores broken at the last note column) honestly cast off into + wildly uneven system widths, so the casting-off axis fires its SHOULD-level + floor diagnostic — the metric is telling the truth about the layout, and + the tests' actual claim (an honoured break is not a *soft violation*) is + preserved exactly. +7. **Measured reality on the reference suite (first real vectors).** The six + v0.1 entries measure clean on every axis except two findings the catalog's + threshold-tuning open question anticipated (both reported as Pass-12/QMC + candidates below): RS-1's `casting_off_quality` = 1.0 (the greedy stub + last line, above the Minimal 0.90 threshold — tracked as a documented + xfail row in the testkit harness), and `spacing_distortion` on 3–8-column + entries (0.36–0.41) sits above the Standard column's 0.32 warning floor, + so short scores warn under the default Standard profile. + +### Pass 12 candidates (quality metrics) + +- **P12 (proposed) — QMC: RS-1 fails the Minimal casting-off threshold under + the reference engraver.** First measured vectors (this crate, engraver v2): + greedy first-fit casts the RS-1 fixture into glyph spans ~78.6/18.8 staff + spaces → width CV 0.61 ≥ the 0.5 anchor → clamped 1.0 > the Minimal 0.90 + threshold. Two consistent resolutions: (a) a casting-off balance pass in + the engraver (a geometry change requiring golden regeneration and a solver + version bump), or (b) a QMC minor revision (raise the `casting_off_quality` + anchor toward ~1.0, or give Minimal a per-axis relaxation / the Reference + Suite an RS-1 override). Until ratified either way, the testkit harness + carries the miss as an asserted Xfail row (budget-harness discipline), so + it cannot rot silently. +- **P12 (proposed) — QMC: the Standard spacing floor warns on short scores.** + With uniform preferred widths, few-column systems (3–8 columns with a wide + clef/key lead) measure spacing CV 0.36–0.41 — above the Standard column's + 0.8 × 0.40 = 0.32 warning floor, so the default profile emits + `QualityFloorApproached(Spacing)` on tiny, healthy scores. Consider either + a duration/lead-aware refinement of the axis (the catalog's optical-spacing + open question) or excluding the lead column from the advance sequence in a + QMC minor revision. diff --git a/crates/epiphany-engrave/src/casting.rs b/crates/epiphany-engrave/src/casting.rs index 12dbc4e..9f3acea 100644 --- a/crates/epiphany-engrave/src/casting.rs +++ b/crates/epiphany-engrave/src/casting.rs @@ -178,6 +178,14 @@ pub(crate) struct CastLayout { pub system_start_slots: BTreeSet, /// Slots at which a page begins: the first slot of each page's first system. pub page_start_slots: BTreeSet, + /// Which system (global index, page order) each realized slot landed in — + /// the casting pass's own assignment, which the quality-metric census + /// ranges over (a slot absent here was claimed by no region and its glyphs + /// belong to no per-system aggregate). + pub system_of_slot: BTreeMap, + /// The region each system slices, indexed by global system index (the + /// per-region grouping the casting-off quality metrics aggregate by). + pub region_of_system: Vec, } /// One realized spring slot in spaced (pre-casting) coordinates, with the @@ -759,6 +767,8 @@ pub(crate) fn cast_off( decisions, system_start_slots, page_start_slots, + system_of_slot, + region_of_system: systems.iter().map(|plan| plan.region).collect(), } } diff --git a/crates/epiphany-engrave/src/lib.rs b/crates/epiphany-engrave/src/lib.rs index a4fc8ee..c0de83c 100644 --- a/crates/epiphany-engrave/src/lib.rs +++ b/crates/epiphany-engrave/src/lib.rs @@ -45,10 +45,17 @@ //! Having earned it, [`Engraver::tier`] reports [`SolverTier::Minimal`] — which //! (Chapter 9 §"Conformance Tiers" / QUICKSTART) means *hard constraints //! satisfied, no claim about optimality* — greedy first-fit casting-off is -//! legitimate at this tier. It therefore makes **no normalized-metric claim**: -//! the quality-metric vector stays the conservative all-worst "no claim" -//! placeholder ([`QualityMetricVector::unmeasured`]) until the Quality Metric -//! Catalog lands (Phase 3 / `Standard`). Still deferred to a later tier: the +//! legitimate at this tier. The solve reports a **real quality-metric vector**: +//! the private `quality` module computes all nine normative axes per the +//! ratified *Quality Metric Catalog* companion (collision census, spacing +//! regularity, break/page/casting-off distribution, vertical gap deviation; +//! slur/beam shape are vacuous-`0.0` because no drawn slur/beam geometry exists +//! yet), normalized through the catalog's pinned anchors +//! ([`epiphany_layout_ir::quality`]), with +//! [`SolverWarningKind::QualityFloorApproached`] diagnostics against the +//! threshold column the config's profile selects. The all-worst +//! [`QualityMetricVector::unmeasured`] placeholder remains only for malformed +//! inputs the solver cannot measure. Still deferred to a later tier: the //! **vertical spring pass** (glyph `y` within a system is the constrained //! natural staff layout, preserved verbatim; systems stack by real content //! extents), per-system justification/stretch, and optimal break search. @@ -63,16 +70,17 @@ //! [`epiphany-render-svg`]: ../epiphany_render_svg/index.html pub mod casting; +mod quality; mod spacing; use std::collections::{BTreeMap, BTreeSet}; use epiphany_layout_ir::{ - all_available, Axis, BravuraCatalog, ConstrainedLayoutIR, ConstraintId, ConstraintSolver, - ConstraintStrength, GlyphCatalog, GlyphObject, GlyphObjectId, InvalidationSet, - LayoutConstraint, Point, QualityMetricVector, Rect, ResolvedGlyph, ResolvedLayoutIR, - SolveReport, SolveStatus, SolverBudgetUsed, SolverConfig, SolverState, SolverTier, - SolverVersion, SolverWarning, SolverWarningKind, SpringSlotId, Stroke, + all_available, profile_thresholds, Axis, BravuraCatalog, ConstrainedLayoutIR, ConstraintId, + ConstraintSolver, ConstraintStrength, GlyphCatalog, GlyphObject, GlyphObjectId, + InvalidationSet, LayoutConstraint, Point, QualityMetricVector, Rect, ResolvedGlyph, + ResolvedLayoutIR, SolveReport, SolveStatus, SolverBudgetUsed, SolverConfig, SolverState, + SolverTier, SolverVersion, SolverWarning, SolverWarningKind, SpringSlotId, Stroke, }; pub use casting::{PageGeometry, INTER_PAGE_GAP, SYSTEM_CONTINUATION_SYNTHESIS}; @@ -128,14 +136,20 @@ impl Engraver { /// slots (each glyph to its slot's `x`, baseline `y` preserved), then the /// casting-off pass (system breaking, vertical stacking, page assignment — /// see [`casting`]), then evaluation of the declared constraints by - /// strength. A malformed input — an unknown glyph, a forged catalog - /// identity, or invalid structure — yields [`SolveStatus::InternalError`]; a - /// valid problem whose `Required` constraints cannot all be satisfied yields - /// [`SolveStatus::Unsatisfiable`] (naming the unsatisfied constraints). Both - /// are diagnostic-only; neither panics. Violated `Preferred` constraints - /// yield soft-violation warnings under [`SolveStatus::SolvedWithWarnings`] - /// — a valid, renderable layout. - fn resolve(&self, input: &ConstrainedLayoutIR) -> SolveReport { + /// strength, then the **quality-metric census** (the private `quality` + /// module): all nine normative axes of the Quality Metric Catalog computed + /// over the cast geometry, with `QualityFloorApproached` warnings against + /// the threshold column the config's profile selects (diagnostic — per the + /// catalog they never change the status). A malformed input — an unknown + /// glyph, a forged catalog identity, or invalid structure — yields + /// [`SolveStatus::InternalError`] with the all-worst unmeasured vector + /// (nothing trustworthy to measure); a valid problem whose `Required` + /// constraints cannot all be satisfied yields + /// [`SolveStatus::Unsatisfiable`] (naming the unsatisfied constraints), its + /// real geometry measured honestly. Neither panics. Violated `Preferred` + /// constraints yield soft-violation warnings under + /// [`SolveStatus::SolvedWithWarnings`] — a valid, renderable layout. + fn resolve(&self, input: &ConstrainedLayoutIR, config: &SolverConfig) -> SolveReport { let structural_valid = input.validate().is_ok(); // Short-circuit before catalog construction so an unknown glyph yields a @@ -237,6 +251,27 @@ impl Engraver { }); } + // The quality-metric census (Quality Metric Catalog): measured whenever + // the geometry is trustworthy — structure valid (the cast ran) and the + // catalog identity genuine (the glyph boxes the census sweeps are the + // real bundled metrics). A malformed input keeps the all-worst + // unmeasured placeholder: there is nothing honest to measure. The + // floor warnings reference the threshold column the config's profile + // selects (Draft -> Minimal, Standard/Publication -> Standard); per the + // catalog they are diagnostic and never change `status`, which was + // fixed above. + let metric_vector = match (&cast, catalog_valid) { + (Some(cast), true) => { + let vector = quality::measure(input, cast, &self.geometry); + warnings.extend(quality::floor_warnings( + &vector, + profile_thresholds(config.profile), + )); + vector + } + _ => QualityMetricVector::unmeasured(), + }; + // The final layout is the cast world frame: real pages and systems, // glyph/stroke positions baked, the engraver's break decisions appended // to the pipeline's (Chapter 7 §"ResolvedLayoutIR": decisions "including @@ -268,11 +303,9 @@ impl Engraver { }, unsatisfied_constraints, warnings, - // Minimal makes no normalized-metric claim (Chapter 9 / QUICKSTART: - // "satisfies hard constraints but makes no normalized-metric claims"; - // the Quality Metric Catalog is Phase 3), so the vector is the - // conservative all-worst "no claim" placeholder, like the stub's. - metric_vector: QualityMetricVector::unmeasured(), + // The real nine-axis census computed above (or the honest all-worst + // placeholder for a malformed input the solver could not measure). + metric_vector, budget_used: SolverBudgetUsed { // The horizontal pass and the casting-off walk each touch every // slot once; report the spacing pass's touch honestly. @@ -547,9 +580,11 @@ fn within(g: &ResolvedGlyph, region: &Rect) -> bool { impl ConstraintSolver for Engraver { fn tier(&self) -> SolverTier { // Minimal (Chapter 9): it evaluates and satisfies the IR's declared hard - // constraints, reporting honestly which (if any) it cannot. It makes no - // normalized-metric claim — `Minimal` means hard constraints satisfied, - // not optimal quality (the Quality Metric Catalog is Phase 3 / `Standard`). + // constraints, reporting honestly which (if any) it cannot, and computes + // real quality-metric vectors per the Quality Metric Catalog — accurate + // reports being part of the Minimal claim. `Minimal` still makes no + // optimality claim (greedy first-fit casting-off is legitimate here); + // the Standard tier's tighter thresholds are not claimed. SolverTier::Minimal } @@ -557,8 +592,8 @@ impl ConstraintSolver for Engraver { ENGRAVER_VERSION } - fn solve(&self, input: &ConstrainedLayoutIR, _config: &SolverConfig) -> SolveReport { - self.resolve(input) + fn solve(&self, input: &ConstrainedLayoutIR, config: &SolverConfig) -> SolveReport { + self.resolve(input, config) } fn solve_incremental( @@ -566,13 +601,13 @@ impl ConstraintSolver for Engraver { input: &ConstrainedLayoutIR, _prior: &SolverState, _invalidations: &InvalidationSet, - _config: &SolverConfig, + config: &SolverConfig, ) -> SolveReport { // The scaffold recomputes spacing from scratch, which is trivially // observationally equivalent to a scoped incremental solve (Chapter 9 // §"Observational Equivalence"). Real incremental scoping is Minimal-tier // work. - self.resolve(input) + self.resolve(input, config) } } @@ -588,14 +623,33 @@ mod tests { #[test] fn reports_the_minimal_tier_it_has_earned() { + use epiphany_layout_ir::{MINIMAL_THRESHOLDS, QUALITY_METRIC_KINDS}; // It evaluates the declared hard constraints, so it reports Minimal — above - // the interface-only stub, below the metric-claiming Standard tier. + // the interface-only stub, below the tighter-threshold Standard tier. assert_eq!(Engraver::default().tier(), SolverTier::Minimal); assert!(Engraver::default().tier() > StubSolver.tier()); assert!(Engraver::default().tier() < SolverTier::Standard); - // Minimal makes no normalized-metric claim (the catalog is Phase 3). + // Accurate metric vectors are part of the Minimal claim (Chapter 9; + // Quality Metric Catalog): the vector is *real* — never the all-worst + // unmeasured placeholder — collision-free on this clean fixture, and + // every axis is a valid NormalizedMetric within the catalog's Minimal + // threshold column (the fixture's three regions each cast onto a + // single system, so the break-family axes degenerate to exactly 0.0 + // under the vacuous-geometry rule). let report = Engraver::default().solve(&fixture(), &SolverConfig::default()); - assert_eq!(report.metric_vector, QualityMetricVector::unmeasured()); + assert_ne!(report.metric_vector, QualityMetricVector::unmeasured()); + assert_eq!(report.metric_vector.collision_penalty.0, 0.0); + for kind in QUALITY_METRIC_KINDS { + let value = report.metric_vector.axis(kind).0; + assert!( + value.is_finite() && (0.0..=1.0).contains(&value), + "{kind:?}" + ); + assert!( + value <= MINIMAL_THRESHOLDS.axis(kind), + "{kind:?} = {value} exceeds its Minimal threshold" + ); + } assert_eq!(Engraver::default().version(), ENGRAVER_VERSION); assert_ne!(Engraver::default().version(), StubSolver.version()); } @@ -795,7 +849,19 @@ mod tests { }); let report = Engraver::default().solve(&input, &SolverConfig::default()); assert_eq!(report.status, SolveStatus::Solved, "{:?}", report.warnings); - assert!(report.warnings.is_empty()); + // The honoured break is never reported as a soft violation. (The + // report legitimately carries QualityFloorApproached diagnostics: this + // two-note micro-score casts off into wildly uneven system widths, + // which the casting-off axis honestly measures — quality warnings are + // diagnostic and, per the catalog, never change the status.) + assert!( + !report.warnings.iter().any(|w| matches!( + w.kind, + SolverWarningKind::LargeSoftConstraintViolation { .. } + )), + "an honoured break must not surface as a soft violation: {:?}", + report.warnings + ); assert!(report.satisfied_hard_constraints); assert_eq!(system_count(&report.layout), 2); assert!(report @@ -906,7 +972,19 @@ mod tests { let engraver = Engraver::default(); let report = engraver.solve(&constrained, &SolverConfig::default()); assert_eq!(report.status, SolveStatus::Solved, "{:?}", report.warnings); - assert!(report.warnings.is_empty(), "an honoured break never warns"); + // An honoured break never warns *about the break* (no soft violation). + // The report may carry QualityFloorApproached diagnostics — this + // few-note score's user break honestly leaves a stub last system, + // which the casting-off axis measures; quality warnings never change + // the status per the catalog. + assert!( + !report.warnings.iter().any(|w| matches!( + w.kind, + SolverWarningKind::LargeSoftConstraintViolation { .. } + )), + "an honoured break never surfaces as a soft violation: {:?}", + report.warnings + ); assert!(report.satisfied_hard_constraints); assert!(report.unsatisfied_constraints.is_empty()); assert!( @@ -1216,8 +1294,11 @@ mod tests { assert_eq!(resolved.provenance, original.provenance); assert_eq!(resolved.glyph, original.glyph); } - // The metric vector is the honest all-worst placeholder (no metrics yet). - assert_eq!(report.metric_vector, QualityMetricVector::unmeasured()); + // The metric vector is real — computed per the Quality Metric Catalog, + // never the all-worst placeholder — and this clean pipeline fixture is + // collision-free under the full same-system census. + assert_ne!(report.metric_vector, QualityMetricVector::unmeasured()); + assert_eq!(report.metric_vector.collision_penalty.0, 0.0); } #[test] diff --git a/crates/epiphany-engrave/src/quality.rs b/crates/epiphany-engrave/src/quality.rs new file mode 100644 index 0000000..0c3f3a8 --- /dev/null +++ b/crates/epiphany-engrave/src/quality.rs @@ -0,0 +1,650 @@ +//! **Real quality-metric computation** — the nine normative axes of the +//! *Quality Metric Catalog* companion (v0.1.0, Chapter 3), measured over what +//! the pipeline already produced: the resolved world-frame geometry +//! ([`CastLayout`]), the constrained input (slot identity, vertical bands), and +//! the declared page geometry. Normalization anchors, threshold tables, and the +//! warning fraction are the catalog's, transcribed in +//! [`epiphany_layout_ir::quality`]. +//! +//! Every measurement here is a pure function of the solve's inputs and its +//! resolved output — no clocks, no entropy, fixed iteration order — so repeated +//! identical solves yield bitwise-identical vectors (catalog +//! `req:qmc:determinism`). Where a metric's contributing-unit set is empty the +//! axis is exactly `0.0` (the catalog's vacuous-geometry rule, +//! `req:qmc:vacuous`), never a sentinel. +//! +//! ## Where each axis's inputs come from +//! +//! * **`collision_penalty`** — full pairwise same-system sweep over resolved +//! glyph ink boxes (positions from casting, boxes from the catalog metrics), +//! excluding same-slot pairs (slot identity = the glyph's +//! `horizontal_slot` in the constrained input; the resolved glyph list is +//! index-parallel to it) and strokes (not glyphs, never swept). +//! * **`spacing_distortion`** — per-system column advances: the distinct +//! resolved x of each glyph-bearing slot realized in the system (its first +//! member's baseline — the spacing pass's own column reference). +//! * **`slur_shape_penalty` / `beam_slope_penalty`** — **vacuous 0.0**: the +//! pipeline draws no slur or beam geometry (slurs/beams exist logically, +//! not as curves/segments), so the contributing-unit sets are empty. The +//! catalog pins vacuous-0.0 deliberately and owns the honesty edge (its +//! "notated-but-unrendered" open question): rendering completeness is +//! governed by constraint families and visual acceptance, not these axes. +//! * **`vertical_density_penalty`** — realized gaps against the band model's +//! preferred heights: the constrained input's `InterStaffGap` bands +//! (adjacent staff bands' resolved ink extents; the constrained stage's +//! fixed staff stacking is preserved verbatim, so this measures what the +//! resolved geometry actually shows), plus the casting pass's realized +//! inter-system gaps (consecutive systems on a page) against +//! [`VerticalBand::inter_system_gap`]'s preferred height — the same +//! constructor the stacking consults. (`to_constrained` declares no +//! `InterSystemGap` bands, so the realized page-tree gaps are the honest +//! measurable unit set; see DECISIONS.) +//! * **`system_break_penalty`** — per-region non-final systems: `|W − w_s| / W` +//! with `W` the declared content width and `w_s` the system's glyph-ink +//! span. +//! * **`page_fill_efficiency`** — non-final pages: unfilled fraction of the +//! declared content height, spans from the resolved page tree's system +//! bounding boxes (top of first system to bottom of last). +//! * **`casting_off_quality`** — per-region CV of system glyph-ink widths, +//! final system included (regions with ≥ 2 systems, all widths positive). +//! * **`symbol_density_uniformity`** — per-region CV of glyphs-per-width +//! density over systems with positive width. + +use std::collections::{BTreeMap, BTreeSet}; + +use epiphany_layout_ir::quality::{ + anchors, normalize, MetricThresholds, QUALITY_FLOOR_FRACTION, QUALITY_METRIC_KINDS, +}; +use epiphany_layout_ir::{ + inter_staff_gap_id, ConstrainedLayoutIR, GlyphObject, GlyphObjectId, QualityMetricVector, + SolverWarning, SolverWarningKind, SpringSlotId, VerticalBand, VerticalBandId, VerticalBandKind, +}; + +use crate::casting::{CastLayout, PageGeometry}; + +/// The population coefficient of variation (catalog §"The Measurement Domain"): +/// defined for `k >= 2` values with positive mean; `None` otherwise. +fn cv(values: &[f64]) -> Option { + if values.len() < 2 { + return None; + } + let mean = values.iter().sum::() / values.len() as f64; + if mean <= 0.0 { + return None; + } + let variance = + values.iter().map(|v| (v - mean) * (v - mean)).sum::() / values.len() as f64; + Some(variance.sqrt() / mean) +} + +/// The arithmetic mean over a contributing-unit set, with the catalog's +/// vacuous-geometry rule in aggregate form: the mean over an empty set is `0`. +fn mean_or_zero(values: &[f64]) -> f64 { + if values.is_empty() { + 0.0 + } else { + values.iter().sum::() / values.len() as f64 + } +} + +/// One glyph's resolved ink box `[left, bottom, right, top]` (f64, exact from +/// the f32 geometry). +fn ink_box(cast: &CastLayout, input: &ConstrainedLayoutIR, index: usize) -> [f64; 4] { + let resolved = &cast.glyphs[index]; + let bounds = &input.glyphs[index].bounding_box; + [ + f64::from(resolved.position.x.0 + bounds.left.0), + f64::from(resolved.position.y.0 + bounds.bottom.0), + f64::from(resolved.position.x.0 + bounds.right.0), + f64::from(resolved.position.y.0 + bounds.top.0), + ] +} + +/// Per-system aggregates over the casting pass's own glyph→system assignment. +struct SystemCensus { + /// Region each system slices (parallel to the other vectors). + region: Vec, + /// Glyph indices per system, in input order. + members: Vec>, + /// Glyph-ink span `w_s` per system (0 for a glyph-less system). + width: Vec, + /// Column reference x per realized slot per system, ascending and distinct. + columns: Vec>, +} + +fn census(input: &ConstrainedLayoutIR, cast: &CastLayout) -> SystemCensus { + let count = cast.region_of_system.len(); + let mut members: Vec> = vec![Vec::new(); count]; + let mut spans: Vec> = vec![None; count]; + // Column reference: the slot's first member (input order) — the same + // convention the spacing and casting passes use for a slot's reference x. + let mut columns: Vec> = vec![BTreeMap::new(); count]; + for (index, glyph) in input.glyphs.iter().enumerate() { + let Some(&system) = cast.system_of_slot.get(&glyph.horizontal_slot) else { + // A slot no region claimed: positioned by no system, so its glyphs + // join no per-system aggregate (catalog §"The Measurement Domain"). + continue; + }; + members[system].push(index); + let [left, _, right, _] = ink_box(cast, input, index); + spans[system] = Some(match spans[system] { + Some((lo, hi)) => (lo.min(left), hi.max(right)), + None => (left, right), + }); + columns[system] + .entry(glyph.horizontal_slot) + .or_insert_with(|| f64::from(cast.glyphs[index].position.x.0)); + } + let width = spans + .iter() + .map(|span| span.map(|(lo, hi)| (hi - lo).max(0.0)).unwrap_or(0.0)) + .collect(); + let columns = columns + .into_iter() + .map(|by_slot| { + let mut xs: Vec = by_slot.into_values().collect(); + xs.sort_by(f64::total_cmp); + xs.dedup(); + xs + }) + .collect(); + SystemCensus { + region: cast.region_of_system.clone(), + members, + width, + columns, + } +} + +/// `collision_penalty` (catalog §`collision_penalty`): colliding unordered +/// same-system, different-slot glyph pairs per glyph. Ink boxes must intersect +/// with positive area in both axes; edge-touching boxes do not collide; +/// same-slot pairs (a column's internal cluster — chord heads, their +/// accidentals, dots) are excluded; strokes are not glyphs and join no pair. +fn collision_raw(input: &ConstrainedLayoutIR, cast: &CastLayout, census: &SystemCensus) -> f64 { + let population = cast.glyphs.len(); + if population == 0 { + return 0.0; + } + let mut colliding_pairs: u64 = 0; + for members in &census.members { + // Interval sweep over left edges: a pair can only overlap horizontally + // while the candidate's left edge is inside the anchor's span. + let mut boxes: Vec<(usize, [f64; 4])> = members + .iter() + .map(|&index| (index, ink_box(cast, input, index))) + .collect(); + boxes.sort_by(|a, b| a.1[0].total_cmp(&b.1[0]).then(a.0.cmp(&b.0))); + for i in 0..boxes.len() { + let (index_a, a) = boxes[i]; + for &(index_b, b) in boxes.iter().skip(i + 1) { + if b[0] >= a[2] { + break; // sorted by left edge: nothing further overlaps in x + } + if input.glyphs[index_a].horizontal_slot == input.glyphs[index_b].horizontal_slot { + continue; // same-column cluster: excluded by the catalog + } + let overlap_x = a[2].min(b[2]) - a[0].max(b[0]); + let overlap_y = a[3].min(b[3]) - a[1].max(b[1]); + if overlap_x > 0.0 && overlap_y > 0.0 { + colliding_pairs += 1; + } + } + } + } + colliding_pairs as f64 / population as f64 +} + +/// `spacing_distortion` (catalog §`spacing_distortion`): mean per-system CV of +/// column advances, over systems realizing at least three columns. +fn spacing_raw(census: &SystemCensus) -> f64 { + let mut per_system = Vec::new(); + for columns in &census.columns { + if columns.len() < 3 { + continue; + } + let advances: Vec = columns.windows(2).map(|pair| pair[1] - pair[0]).collect(); + if let Some(value) = cv(&advances) { + per_system.push(value); + } + } + mean_or_zero(&per_system) +} + +/// `vertical_density_penalty` (catalog §`vertical_density_penalty`): mean +/// relative deviation `|r − p| / p` over the realized inter-staff and +/// inter-system gaps (see the module docs for the unit reconstruction). +fn vertical_raw(input: &ConstrainedLayoutIR, cast: &CastLayout, census: &SystemCensus) -> f64 { + let mut per_unit: Vec = Vec::new(); + + // --- InterStaffGap bands declared by the constrained input ------------- + let index_of: BTreeMap = input + .glyphs + .iter() + .enumerate() + .map(|(index, glyph)| (GlyphObject::id(glyph), index)) + .collect(); + let system_of_glyph = |index: usize| -> Option { + cast.system_of_slot + .get(&input.glyphs[index].horizontal_slot) + .copied() + }; + for (region_index, region) in input.regions.iter().enumerate() { + // The region's laid-out staff bands, top staff first, ordered within + // the region's first system (systems translate rigidly, so within- + // system y order is the region's staff order). + let first_system = census.region.iter().position(|&r| r == region_index); + let Some(first_system) = first_system else { + continue; + }; + let region_glyphs: BTreeSet = region.glyphs.iter().copied().collect(); + let mut staves: Vec<(f64, Vec)> = Vec::new(); + for band in &input.vertical_bands { + if !matches!(band.kind, VerticalBandKind::Staff(_)) { + continue; + } + if !band.members.iter().any(|id| region_glyphs.contains(id)) { + continue; + } + let members: Vec = band + .members + .iter() + .filter_map(|id| index_of.get(id).copied()) + .collect(); + let top_in_first = members + .iter() + .filter(|&&index| system_of_glyph(index) == Some(first_system)) + .map(|&index| ink_box(cast, input, index)[3]) + .fold(f64::NEG_INFINITY, f64::max); + if top_in_first.is_finite() { + staves.push((top_in_first, members)); + } + } + // Top staff first. + staves.sort_by(|a, b| b.0.total_cmp(&a.0)); + + // The region's declared inter-staff gap bands, by their derived ids + // (gap g separates the region's staves g−1 and g, per to_constrained). + let region_layout_id = region.provenance.stable_id; + for gap in 1.. { + let gap_id = inter_staff_gap_id(region_layout_id, gap); + let Some(band) = input.vertical_bands.iter().find(|band| band.id == gap_id) else { + break; + }; + let preferred = f64::from(band.preferred_height.0); + if preferred <= 0.0 || staves.len() <= gap { + continue; + } + let upper = &staves[gap - 1].1; + let lower = &staves[gap].1; + // Realized iff the adjacent content shares a system; measure the + // separation there (rigid system translation makes every common + // system agree). + let common: BTreeSet = upper + .iter() + .filter_map(|&index| system_of_glyph(index)) + .filter(|system| { + lower + .iter() + .any(|&index| system_of_glyph(index) == Some(*system)) + }) + .collect(); + let Some(&system) = common.iter().next() else { + continue; + }; + let upper_bottom = upper + .iter() + .filter(|&&index| system_of_glyph(index) == Some(system)) + .map(|&index| ink_box(cast, input, index)[1]) + .fold(f64::INFINITY, f64::min); + let lower_top = lower + .iter() + .filter(|&&index| system_of_glyph(index) == Some(system)) + .map(|&index| ink_box(cast, input, index)[3]) + .fold(f64::NEG_INFINITY, f64::max); + let realized = (upper_bottom - lower_top).max(0.0); + per_unit.push((realized - preferred).abs() / preferred); + } + } + + // --- Realized inter-system gaps (consecutive systems on a page) -------- + let preferred = f64::from( + VerticalBand::inter_system_gap(VerticalBandId(0)) + .preferred_height + .0, + ); + if preferred > 0.0 { + for page in &cast.pages { + for pair in page.systems.windows(2) { + let upper_bottom = f64::from(pair[0].bounding_box.origin.y.0); + let lower_top = + f64::from(pair[1].bounding_box.origin.y.0 + pair[1].bounding_box.size.height.0); + let realized = (upper_bottom - lower_top).max(0.0); + per_unit.push((realized - preferred).abs() / preferred); + } + } + } + + mean_or_zero(&per_unit) +} + +/// `system_break_penalty` (catalog §`system_break_penalty`): mean +/// `|W − w_s| / W` over each region's non-final systems, defined only for a +/// finite positive content width. +fn system_break_raw(census: &SystemCensus, content_width: f64) -> f64 { + if !(content_width.is_finite() && content_width > 0.0) { + return 0.0; + } + let mut per_unit = Vec::new(); + for (system, ®ion) in census.region.iter().enumerate() { + let last_of_region = census.region.iter().rposition(|&r| r == region); + if last_of_region == Some(system) { + continue; // a short last line is not a break failure + } + per_unit.push((content_width - census.width[system]).abs() / content_width); + } + mean_or_zero(&per_unit) +} + +/// `page_fill_efficiency` (catalog §`page_fill_efficiency`): mean unfilled +/// fraction over non-final pages, spans measured from the resolved page tree +/// (top of the first system's content extent to the bottom of the last's). +fn page_fill_raw(cast: &CastLayout, content_height: f64) -> f64 { + if !(content_height.is_finite() && content_height > 0.0) || cast.pages.len() < 2 { + return 0.0; + } + let mut per_unit = Vec::new(); + for page in &cast.pages[..cast.pages.len() - 1] { + let (Some(first), Some(last)) = (page.systems.first(), page.systems.last()) else { + continue; + }; + let top = f64::from(first.bounding_box.origin.y.0 + first.bounding_box.size.height.0); + let bottom = f64::from(last.bounding_box.origin.y.0); + let fill = ((top - bottom) / content_height).min(1.0); + per_unit.push(1.0 - fill); + } + mean_or_zero(&per_unit) +} + +/// `casting_off_quality` (catalog §`casting_off_quality`): mean per-region CV +/// of system widths — final system included — over regions cast onto at least +/// two systems, each with positive width. +fn casting_off_raw(input: &ConstrainedLayoutIR, census: &SystemCensus) -> f64 { + let mut per_region = Vec::new(); + for region in 0..input.regions.len() { + let widths: Vec = census + .region + .iter() + .zip(&census.width) + .filter(|&(&r, _)| r == region) + .map(|(_, &w)| w) + .collect(); + if widths.len() < 2 || widths.iter().any(|&w| w <= 0.0) { + continue; + } + if let Some(value) = cv(&widths) { + per_region.push(value); + } + } + mean_or_zero(&per_region) +} + +/// `symbol_density_uniformity` (catalog §`symbol_density_uniformity`): mean +/// per-region CV of per-system symbol density (glyphs per staff space of +/// content width), over regions with at least two positive-width systems. +fn symbol_density_raw(input: &ConstrainedLayoutIR, census: &SystemCensus) -> f64 { + let mut per_region = Vec::new(); + for region in 0..input.regions.len() { + let densities: Vec = census + .region + .iter() + .enumerate() + .filter(|&(system, &r)| r == region && census.width[system] > 0.0) + .map(|(system, _)| census.members[system].len() as f64 / census.width[system]) + .collect(); + if densities.len() < 2 { + continue; + } + if let Some(value) = cv(&densities) { + per_region.push(value); + } + } + mean_or_zero(&per_region) +} + +/// Computes the full nine-axis [`QualityMetricVector`] for a cast layout, per +/// the Quality Metric Catalog's formulas and pinned anchors. Pure and +/// deterministic: a function of the constrained input, the cast output, and +/// the declared page geometry. +pub(crate) fn measure( + input: &ConstrainedLayoutIR, + cast: &CastLayout, + geometry: &PageGeometry, +) -> QualityMetricVector { + let census = census(input, cast); + let content_width = f64::from(geometry.content_width()); + let content_height = f64::from(geometry.content_height()); + QualityMetricVector { + collision_penalty: normalize( + collision_raw(input, cast, &census), + anchors::COLLISION_R_WORST, + ), + spacing_distortion: normalize(spacing_raw(&census), anchors::SPACING_R_WORST), + // No drawn slur geometry exists in this pipeline (slurs are logical + // objects, not curves): the contributing-unit set is empty, so the + // axis is exactly 0.0 per the catalog's vacuous-geometry rule. The + // catalog's "notated-but-unrendered" open question owns the honesty + // edge; the definition is pinned so the first slur-drawing release is + // measured from day one. + slur_shape_penalty: normalize(0.0, anchors::SLUR_SHAPE_R_WORST), + // Same vacuous rule: no drawn beam segments exist in this pipeline. + beam_slope_penalty: normalize(0.0, anchors::BEAM_SLOPE_R_WORST), + vertical_density_penalty: normalize( + vertical_raw(input, cast, &census), + anchors::VERTICAL_DENSITY_R_WORST, + ), + system_break_penalty: normalize( + system_break_raw(&census, content_width), + anchors::SYSTEM_BREAK_R_WORST, + ), + page_fill_efficiency: normalize( + page_fill_raw(cast, content_height), + anchors::PAGE_FILL_R_WORST, + ), + casting_off_quality: normalize( + casting_off_raw(input, &census), + anchors::CASTING_OFF_R_WORST, + ), + symbol_density_uniformity: normalize( + symbol_density_raw(input, &census), + anchors::SYMBOL_DENSITY_R_WORST, + ), + extension_metrics: Vec::new(), + } +} + +/// The `QualityFloorApproached` warnings a computed vector earns (catalog +/// §"The `QualityFloorApproached` Warning", `req:qmc:floor-warning`): one per +/// axis whose value exceeds [`QUALITY_FLOOR_FRACTION`] × the applicable +/// threshold — the column selected by the solve's profile. The warning is +/// diagnostic; per the catalog it does **not** change the solve's status. +pub(crate) fn floor_warnings( + vector: &QualityMetricVector, + thresholds: &MetricThresholds, +) -> Vec { + QUALITY_METRIC_KINDS + .iter() + .filter_map(|&kind| { + let value = vector.axis(kind).0; + let threshold = thresholds.axis(kind); + let floor = QUALITY_FLOOR_FRACTION * threshold; + (value > floor).then(|| SolverWarning { + kind: SolverWarningKind::QualityFloorApproached { metric: kind }, + affected_objects: Vec::new(), + message: format!( + "quality metric {kind:?} at {value:.4} exceeds {QUALITY_FLOOR_FRACTION} x \ + the profile's threshold {threshold:.2} (floor {floor:.3})" + ), + }) + }) + .collect() +} + +#[cfg(test)] +mod tests { + use crate::Engraver; + use epiphany_layout_ir::{ + to_constrained, to_logical, ConstrainedLayoutIR, ConstraintSolver, QualityMetricKind, + QualityMetricVector, SolveStatus, SolverConfig, SolverProfile, SolverWarningKind, + QUALITY_METRIC_KINDS, + }; + + /// The QUICKSTART ten-measure hand-off fixture: wraps into two systems + /// under the default A4 geometry — the multi-system measurement case. + fn ten_measure() -> ConstrainedLayoutIR { + to_constrained(&to_logical( + &epiphany_testkit::fixtures::ten_measure_single_staff(0x000A_11CE), + )) + } + + fn axes(vector: &QualityMetricVector) -> [f64; 9] { + let mut values = [0.0; 9]; + for (slot, kind) in values.iter_mut().zip(QUALITY_METRIC_KINDS) { + *slot = vector.axis(kind).0; + } + values + } + + #[test] + fn metric_vectors_are_bitwise_deterministic() { + // Catalog `req:qmc:determinism`: identical solve inputs yield + // bitwise-identical vectors within one implementation version — the + // metrics are a pure function of the resolved output and the inputs. + let input = ten_measure(); + let a = Engraver::default().solve(&input, &SolverConfig::default()); + let b = Engraver::default().solve(&input, &SolverConfig::default()); + assert_eq!(a.layout.canonical_bytes(), b.layout.canonical_bytes()); + for (x, y) in axes(&a.metric_vector).iter().zip(axes(&b.metric_vector)) { + assert_eq!( + x.to_bits(), + y.to_bits(), + "metric f64s must be bit-identical" + ); + } + } + + #[test] + fn the_wrapping_fixture_is_measured_honestly() { + // The ten-measure fixture under the default geometry, measured for + // real (values pinned loosely; the goldens pin the geometry itself): + // no cross-column collisions; regular spacing; a single page (the + // page-fill axis degenerates to exactly 0.0); and — the honest part — + // greedy first-fit leaves a two-measure stub last system (glyph spans + // ~78.6 vs ~18.8 staff spaces), which the casting-off axis measures at + // its clamped worst (CV 0.61 >= the 0.5 anchor -> 1.0). That is the + // exact "stub final system" failure the catalog says the axis exists + // to catch; the value is truthful, not a defect in the census. + let report = Engraver::default().solve(&ten_measure(), &SolverConfig::default()); + let vector = &report.metric_vector; + assert_eq!(vector.collision_penalty.0, 0.0); + assert!(vector.spacing_distortion.0 > 0.0 && vector.spacing_distortion.0 < 0.3); + assert_eq!(vector.slur_shape_penalty.0, 0.0, "vacuous: no drawn slurs"); + assert_eq!(vector.beam_slope_penalty.0, 0.0, "vacuous: no drawn beams"); + assert_eq!(vector.page_fill_efficiency.0, 0.0, "vacuous: single page"); + assert!( + vector.system_break_penalty.0 > 0.0 && vector.system_break_penalty.0 < 0.35, + "the non-final system is nearly full: {}", + vector.system_break_penalty.0 + ); + assert_eq!( + vector.casting_off_quality.0, 1.0, + "the stub last line is honestly at the clamped worst" + ); + assert!( + vector.symbol_density_uniformity.0 < 0.1, + "density is even though widths are not: {}", + vector.symbol_density_uniformity.0 + ); + // The casting-off axis exceeds 0.8 x its threshold in every ratified + // column, so the SHOULD-level floor diagnostic fires — and, per the + // catalog, the status is untouched by it. + assert!(report.warnings.iter().any(|w| matches!( + w.kind, + SolverWarningKind::QualityFloorApproached { + metric: QualityMetricKind::CastingOff + } + ))); + assert_eq!(report.status, SolveStatus::Solved); + } + + #[test] + fn floor_warnings_reference_the_profiles_threshold_column() { + // The b-flat scale's spacing distortion (~0.41: eight columns whose + // flat-bearing columns advance wider) sits between the Standard + // column's floor (0.8 x 0.40 = 0.32) and the Minimal column's + // (0.8 x 0.90 = 0.72) — so the default Standard profile warns about + // Spacing and the Draft profile (which selects the Minimal column per + // the catalog's profile registry) does not. + let score = epiphany_testkit::corpus::corpus() + .into_iter() + .find(|fixture| fixture.name == "b_flat_major_scale") + .expect("corpus entry exists"); + let input = to_constrained(&to_logical(&(score.build)())); + let spacing_warned = |profile: SolverProfile| { + let config = SolverConfig { + profile, + ..SolverConfig::default() + }; + Engraver::default() + .solve(&input, &config) + .warnings + .iter() + .any(|w| { + matches!( + w.kind, + SolverWarningKind::QualityFloorApproached { + metric: QualityMetricKind::Spacing + } + ) + }) + }; + assert!(spacing_warned(SolverProfile::Standard)); + assert!(spacing_warned(SolverProfile::Publication)); + assert!(!spacing_warned(SolverProfile::Draft)); + // The metric itself is profile-independent — only the diagnostic + // column changes. + let value = Engraver::default() + .solve(&input, &SolverConfig::default()) + .metric_vector + .spacing_distortion + .0; + assert!((0.32..=0.72).contains(&value), "spacing = {value}"); + } + + #[test] + fn a_malformed_input_stays_unmeasured() { + // A structurally invalid input has no trustworthy geometry: the vector + // is the honest all-worst placeholder, not a vacuous all-best zero. + let mut input = ten_measure(); + input.glyphs[0].baseline = epiphany_layout_ir::Point::new(f32::NAN, 0.0); + let report = Engraver::default().solve(&input, &SolverConfig::default()); + assert_eq!(report.status, SolveStatus::InternalError); + assert_eq!(report.metric_vector, QualityMetricVector::unmeasured()); + // ... and no floor diagnostics are derived from a placeholder. + assert!(!report + .warnings + .iter() + .any(|w| matches!(w.kind, SolverWarningKind::QualityFloorApproached { .. }))); + } + + #[test] + fn realized_inter_system_gaps_measure_the_band_models_preferred_height() { + // The casting pass stacks systems at the vertical-band constructor's + // preferred inter-system gap, so the vertical-density axis measures + // realized == preferred (raw 0.0) on the wrapping fixture — the honest + // near-zero the catalog's rationale describes, *measured* from the + // resolved page tree rather than assumed. + let report = Engraver::default().solve(&ten_measure(), &SolverConfig::default()); + assert_eq!(report.metric_vector.vertical_density_penalty.0, 0.0); + } +} diff --git a/crates/epiphany-layout-ir/DECISIONS.md b/crates/epiphany-layout-ir/DECISIONS.md index 1afe0f1..eafa42c 100644 --- a/crates/epiphany-layout-ir/DECISIONS.md +++ b/crates/epiphany-layout-ir/DECISIONS.md @@ -421,3 +421,27 @@ object is covered); the provenance-preservation contract itself is unchanged. P12-I2 wired it: `epiphany-determinism` reserves the built-in `DomainTag::LAYOUT_OBJECT_ID` and `provenance.rs` (and the engraving-decision id) route through it. See the ratified-block note at the top of this file. + +## Quality Metric Catalog constants (`src/quality.rs`, 2026-07) + +**Decision: the catalog's normative constants live in this crate, as a pure +transcription.** The Quality Metric Catalog companion (v0.1.0) pins the nine +axes' normalization anchors (`R_worst`), the clamped-linear normalization form +`n = min(1, raw / R_worst)`, the Minimal/Standard threshold table, the +`QualityFloorApproached` warning fraction (0.8), and the tier/profile → +threshold-column mappings (Minimal has its own column; Standard and Advanced +use the Standard column; profiles Draft → Minimal column, Standard and +Publication → Standard column, Standard the default). Both consumers — the +`epiphany-engrave` solver (computing vectors and floor diagnostics) and the +`epiphany-testkit` reference-suite harness (asserting per-tier thresholds) — +need the same numbers, and this crate is the only one both already depend on, +so the constants live here (`quality.rs`) with doc comments citing the +companion by chapter/section. **Every value is transcribed, none invented**; +a change to any of them is a catalog revision first, mirrored here. The +module is additive: no canonical encoding is touched (metric values remain +diagnostic-only, structurally outside `ResolvedLayoutIR` — the catalog's own +requirement), and the `StubSolver` still computes nothing and keeps its +all-worst `unmeasured()` vector, which a transcription test pins as excluded +by the Minimal column ("measuring is part of the Minimal claim"). The catalog +also blesses the existing `TieBreakingWeights::default()` (all 1.0) as the +normative defaults — pinned by test rather than re-declared. diff --git a/crates/epiphany-layout-ir/src/lib.rs b/crates/epiphany-layout-ir/src/lib.rs index b9de1f6..6e6e047 100644 --- a/crates/epiphany-layout-ir/src/lib.rs +++ b/crates/epiphany-layout-ir/src/lib.rs @@ -73,6 +73,7 @@ pub mod glyph; pub mod hittest; pub mod logical; pub mod provenance; +pub mod quality; pub mod render; pub mod resolved; pub mod roundtrip; @@ -126,6 +127,10 @@ pub use provenance::{ continuation_instance_key, manifestation_layout_id, stable_layout_id, synthesized_layout_id, LayoutObjectId, Provenance, SynthesisInstanceKey, SynthesisKind, SynthesisRegistryId, }; +pub use quality::{ + normalize, profile_thresholds, r_worst, tier_thresholds, MetricThresholds, MINIMAL_THRESHOLDS, + QUALITY_FLOOR_FRACTION, QUALITY_METRIC_KINDS, STANDARD_THRESHOLDS, +}; pub use render::{ to_render, ColorConfiguration, ColorSpace, PassthroughRenderProducer, RasterizationConfiguration, RenderConfiguration, RenderIR, RenderIRProducer, RenderPrimitive, diff --git a/crates/epiphany-layout-ir/src/quality.rs b/crates/epiphany-layout-ir/src/quality.rs new file mode 100644 index 0000000..2d5c5c3 --- /dev/null +++ b/crates/epiphany-layout-ir/src/quality.rs @@ -0,0 +1,341 @@ +//! The Quality Metric Catalog's normative constants (companion specification +//! *Epiphany — Quality Metric Catalog*, v0.1.0): the per-axis normalization +//! anchors, the per-tier metric threshold table, the profile→threshold-column +//! mapping, and the `QualityFloorApproached` warning fraction. +//! +//! This module is a **transcription**, not an invention: every number here is +//! pinned by the catalog and cited to its chapter. Solvers that compute real +//! metrics (e.g. `epiphany-engrave`) normalize raw measurements through +//! [`normalize`] with the [`anchors`] of catalog Chapter 3 ("The Nine Normative +//! Metrics"), and reference the threshold tables of catalog Chapter 5 +//! ("Per-Tier Metric Thresholds") — as does the reference-suite harness in +//! `epiphany-testkit`. The in-crate [`StubSolver`](crate::StubSolver) computes +//! no metrics and touches none of this (it stays on the all-worst +//! [`QualityMetricVector::unmeasured`] placeholder, the honest "no claim" +//! vector the catalog's vacuous-geometry requirement reserves for a solver +//! that computes no metrics at all). + +use crate::solver::{ + NormalizedMetric, QualityMetricKind, QualityMetricVector, SolverProfile, SolverTier, +}; + +/// The nine normative metric axes in their catalog order (catalog §"The +/// Normative Metric Set and `QualityMetricKind`", Table "kind-mapping"). +pub const QUALITY_METRIC_KINDS: [QualityMetricKind; 9] = [ + QualityMetricKind::Collision, + QualityMetricKind::Spacing, + QualityMetricKind::SlurShape, + QualityMetricKind::BeamSlope, + QualityMetricKind::VerticalDensity, + QualityMetricKind::SystemBreak, + QualityMetricKind::PageFill, + QualityMetricKind::CastingOff, + QualityMetricKind::SymbolDensity, +]; + +/// The per-axis normalization anchors `R_worst` (catalog Chapter 3): each +/// normative metric defines a dimensionless raw measurement `raw >= 0` and a +/// pinned anchor, and normalizes by the clamped-linear map +/// `n = min(1, raw / R_worst)` (catalog §"Normalization Form", +/// `req:qmc:normalization-form`). Implementations MUST use these anchors; +/// arbitrary normalization is non-conforming. +pub mod anchors { + /// `collision_penalty` (catalog §`collision_penalty`): colliding + /// cross-column pairs per glyph; one collision per twenty glyphs is + /// worst-tolerable. + pub const COLLISION_R_WORST: f64 = 0.05; + /// `spacing_distortion` (catalog §`spacing_distortion`): mean per-system + /// CV of column advances; CV 1.0 is spacing with no discernible + /// regularity. + pub const SPACING_R_WORST: f64 = 1.0; + /// `slur_shape_penalty` (catalog §`slur_shape_penalty`): mean deviation of + /// the arc ratio from the ideal band `[0.08, 0.25]`; a semicircular slur + /// (deviation 0.25) is worst-tolerable. + pub const SLUR_SHAPE_R_WORST: f64 = 0.25; + /// `beam_slope_penalty` (catalog §`beam_slope_penalty`): mean slope excess + /// over 0.25; slope 0.5 (deviation 0.25) is worst-tolerable. + pub const BEAM_SLOPE_R_WORST: f64 = 0.25; + /// `vertical_density_penalty` (catalog §`vertical_density_penalty`): mean + /// relative gap deviation `|r - p| / p`; a gap off by its own preferred + /// size is worst-tolerable. + pub const VERTICAL_DENSITY_R_WORST: f64 = 1.0; + /// `system_break_penalty` (catalog §`system_break_penalty`): mean + /// `|W - w_s| / W` over non-final systems; half-empty (or half-overflowing) + /// non-final systems are worst-tolerable. + pub const SYSTEM_BREAK_R_WORST: f64 = 0.5; + /// `page_fill_efficiency` (catalog §`page_fill_efficiency`): mean unfilled + /// fraction of non-final pages; three-quarters empty is worst-tolerable. + pub const PAGE_FILL_R_WORST: f64 = 0.75; + /// `casting_off_quality` (catalog §`casting_off_quality`): mean per-region + /// CV of system widths (final system included); CV 0.5 is worst-tolerable. + pub const CASTING_OFF_R_WORST: f64 = 0.5; + /// `symbol_density_uniformity` (catalog §`symbol_density_uniformity`): + /// mean per-region CV of glyphs-per-width densities; CV 0.5 is + /// worst-tolerable. + pub const SYMBOL_DENSITY_R_WORST: f64 = 0.5; +} + +/// The pinned anchor `R_worst` for a normative axis (catalog Chapter 3; see +/// [`anchors`]). +pub fn r_worst(kind: QualityMetricKind) -> f64 { + match kind { + QualityMetricKind::Collision => anchors::COLLISION_R_WORST, + QualityMetricKind::Spacing => anchors::SPACING_R_WORST, + QualityMetricKind::SlurShape => anchors::SLUR_SHAPE_R_WORST, + QualityMetricKind::BeamSlope => anchors::BEAM_SLOPE_R_WORST, + QualityMetricKind::VerticalDensity => anchors::VERTICAL_DENSITY_R_WORST, + QualityMetricKind::SystemBreak => anchors::SYSTEM_BREAK_R_WORST, + QualityMetricKind::PageFill => anchors::PAGE_FILL_R_WORST, + QualityMetricKind::CastingOff => anchors::CASTING_OFF_R_WORST, + QualityMetricKind::SymbolDensity => anchors::SYMBOL_DENSITY_R_WORST, + } +} + +/// The catalog's clamped-linear normalization (catalog §"Normalization Form", +/// `req:qmc:normalization-form`): `n = min(1, raw / R_worst)`, so `raw = 0` +/// (the ideal) normalizes to `0.0` and `raw >= R_worst` (the worst-tolerable +/// anchor and beyond) normalizes to `1.0`. +/// +/// `raw` must be a finite, non-negative measurement and `r_worst` a positive +/// anchor, per the catalog; the result is a valid [`NormalizedMetric`] by +/// construction. +pub fn normalize(raw: f64, r_worst: f64) -> NormalizedMetric { + assert!( + raw.is_finite() && raw >= 0.0, + "a raw quality measurement must be finite and non-negative (got {raw})" + ); + assert!( + r_worst > 0.0, + "a normalization anchor must be positive (got {r_worst})" + ); + NormalizedMetric::new((raw / r_worst).min(1.0)) +} + +/// One column of the catalog's per-tier threshold table (catalog Chapter 5, +/// Table "tier-thresholds"): the maximum permitted [`NormalizedMetric`] value +/// per axis for a reference-suite entry evaluated at that tier. +#[derive(Copy, Clone, PartialEq, Debug)] +pub struct MetricThresholds { + pub collision_penalty: f64, + pub spacing_distortion: f64, + pub slur_shape_penalty: f64, + pub beam_slope_penalty: f64, + pub vertical_density_penalty: f64, + pub system_break_penalty: f64, + pub page_fill_efficiency: f64, + pub casting_off_quality: f64, + pub symbol_density_uniformity: f64, +} + +impl MetricThresholds { + /// The column's threshold for one axis. + pub fn axis(&self, kind: QualityMetricKind) -> f64 { + match kind { + QualityMetricKind::Collision => self.collision_penalty, + QualityMetricKind::Spacing => self.spacing_distortion, + QualityMetricKind::SlurShape => self.slur_shape_penalty, + QualityMetricKind::BeamSlope => self.beam_slope_penalty, + QualityMetricKind::VerticalDensity => self.vertical_density_penalty, + QualityMetricKind::SystemBreak => self.system_break_penalty, + QualityMetricKind::PageFill => self.page_fill_efficiency, + QualityMetricKind::CastingOff => self.casting_off_quality, + QualityMetricKind::SymbolDensity => self.symbol_density_uniformity, + } + } +} + +/// The **Minimal** threshold column (catalog Chapter 5, Table +/// "tier-thresholds"): uniformly `0.90` — relaxed but non-vacuous, excluding +/// layouts at an axis's worst-tolerable anchor and the all-worst unmeasured +/// placeholder ("measuring is part of the Minimal claim"). +pub const MINIMAL_THRESHOLDS: MetricThresholds = MetricThresholds { + collision_penalty: 0.90, + spacing_distortion: 0.90, + slur_shape_penalty: 0.90, + beam_slope_penalty: 0.90, + vertical_density_penalty: 0.90, + system_break_penalty: 0.90, + page_fill_efficiency: 0.90, + casting_off_quality: 0.90, + symbol_density_uniformity: 0.90, +}; + +/// The **Standard** threshold column (catalog Chapter 5, Table +/// "tier-thresholds"): professional engraving quality — collisions bounded +/// tightest (`0.25`), the break family at `0.35`, distribution/vertical proxies +/// at `0.40`, slur/beam shape at `0.30`. +pub const STANDARD_THRESHOLDS: MetricThresholds = MetricThresholds { + collision_penalty: 0.25, + spacing_distortion: 0.40, + slur_shape_penalty: 0.30, + beam_slope_penalty: 0.30, + vertical_density_penalty: 0.40, + system_break_penalty: 0.35, + page_fill_efficiency: 0.40, + casting_off_quality: 0.35, + symbol_density_uniformity: 0.40, +}; + +/// The `QualityFloorApproached` warning fraction (catalog §"The +/// `QualityFloorApproached` Warning", `req:qmc:floor-warning`): a solver SHOULD +/// warn for axis `k` when `k`'s computed value exceeds **0.8×** the applicable +/// threshold — the one selected by the solve's [`SolverProfile`] +/// ([`profile_thresholds`]). The warning is diagnostic: emitting it does not +/// change the solve's status. +pub const QUALITY_FLOOR_FRACTION: f64 = 0.8; + +/// The threshold column a **conformance tier** is evaluated against on the +/// reference suite (catalog Chapter 5): `Minimal` has its own relaxed column; +/// `Standard` the professional column; `Advanced` imposes the Standard column +/// on the nine normative axes (plus per-extension thresholds, +/// `req:qmc:advanced`, which this table does not model). `Stub` is below every +/// conformance tier and is evaluated against nothing — it computes no metrics +/// and passes no suite. +pub fn tier_thresholds(tier: SolverTier) -> Option<&'static MetricThresholds> { + match tier { + SolverTier::Stub => None, + SolverTier::Minimal => Some(&MINIMAL_THRESHOLDS), + SolverTier::Standard | SolverTier::Advanced => Some(&STANDARD_THRESHOLDS), + } +} + +/// The threshold column a **registered profile** selects (catalog Chapter 6, +/// `req:qmc:profiles`): `Draft` → the Minimal column (few warnings, fast +/// iteration); `Standard` and `Publication` → the Standard column (no column +/// tighter than Standard is ratified in v0.1). This is the column the solver's +/// own `QualityFloorApproached` diagnostics reference during ordinary solves; +/// suite evaluation at a claimed tier always uses that *tier's* column +/// ([`tier_thresholds`]). +pub fn profile_thresholds(profile: SolverProfile) -> &'static MetricThresholds { + match profile { + SolverProfile::Draft => &MINIMAL_THRESHOLDS, + SolverProfile::Standard | SolverProfile::Publication => &STANDARD_THRESHOLDS, + } +} + +impl QualityMetricVector { + /// The vector's value for one normative axis, by its + /// [`QualityMetricKind`] (catalog Table "kind-mapping": each kind names + /// exactly one vector field). + pub fn axis(&self, kind: QualityMetricKind) -> NormalizedMetric { + match kind { + QualityMetricKind::Collision => self.collision_penalty, + QualityMetricKind::Spacing => self.spacing_distortion, + QualityMetricKind::SlurShape => self.slur_shape_penalty, + QualityMetricKind::BeamSlope => self.beam_slope_penalty, + QualityMetricKind::VerticalDensity => self.vertical_density_penalty, + QualityMetricKind::SystemBreak => self.system_break_penalty, + QualityMetricKind::PageFill => self.page_fill_efficiency, + QualityMetricKind::CastingOff => self.casting_off_quality, + QualityMetricKind::SymbolDensity => self.symbol_density_uniformity, + } + } +} + +#[cfg(test)] +mod tests { + use super::*; + use crate::solver::TieBreakingWeights; + + #[test] + fn normalization_is_the_catalogs_clamped_linear_map() { + assert_eq!(normalize(0.0, 0.5).0, 0.0); + assert_eq!(normalize(0.25, 0.5).0, 0.5); + assert_eq!(normalize(0.5, 0.5).0, 1.0); + // At and beyond the anchor clamps to the worst-tolerable 1.0. + assert_eq!(normalize(3.0, 0.5).0, 1.0); + } + + #[test] + #[should_panic(expected = "finite and non-negative")] + fn normalization_rejects_a_negative_raw() { + let _ = normalize(-0.1, 0.5); + } + + #[test] + fn minimal_is_uniformly_more_permissive_than_standard() { + // Catalog Table "tier-thresholds": "Minimal is uniformly more + // permissive than Standard on every axis." + for kind in QUALITY_METRIC_KINDS { + assert!( + MINIMAL_THRESHOLDS.axis(kind) > STANDARD_THRESHOLDS.axis(kind), + "{kind:?}" + ); + // Both columns are valid NormalizedMetric bounds. + assert!((0.0..=1.0).contains(&MINIMAL_THRESHOLDS.axis(kind))); + assert!((0.0..=1.0).contains(&STANDARD_THRESHOLDS.axis(kind))); + } + } + + #[test] + fn the_minimal_column_excludes_the_unmeasured_placeholder() { + // Catalog Chapter 5 rationale: "a solver reporting the unmeasured 1.0 + // placeholder cannot pass the Minimal suite" — measuring is part of + // the Minimal claim. + let unmeasured = QualityMetricVector::unmeasured(); + assert!(QUALITY_METRIC_KINDS + .iter() + .any(|&k| unmeasured.axis(k).0 > MINIMAL_THRESHOLDS.axis(k))); + } + + #[test] + fn tier_and_profile_columns_map_per_the_catalog() { + // Tiers (catalog ch5): Minimal has its own column; Standard and + // Advanced share the Standard column; Stub is evaluated against nothing. + assert_eq!(tier_thresholds(SolverTier::Stub), None); + assert_eq!( + tier_thresholds(SolverTier::Minimal), + Some(&MINIMAL_THRESHOLDS) + ); + assert_eq!( + tier_thresholds(SolverTier::Standard), + Some(&STANDARD_THRESHOLDS) + ); + assert_eq!( + tier_thresholds(SolverTier::Advanced), + Some(&STANDARD_THRESHOLDS) + ); + // Profiles (catalog ch6): Draft → Minimal column; Standard and + // Publication → Standard column; Standard is the default profile. + assert_eq!( + profile_thresholds(SolverProfile::Draft), + &MINIMAL_THRESHOLDS + ); + assert_eq!( + profile_thresholds(SolverProfile::Standard), + &STANDARD_THRESHOLDS + ); + assert_eq!( + profile_thresholds(SolverProfile::Publication), + &STANDARD_THRESHOLDS + ); + assert_eq!(SolverProfile::default(), SolverProfile::Standard); + } + + #[test] + fn default_tie_breaking_weights_are_the_catalogs_normative_defaults() { + // Catalog Chapter 4 (`req:qmc:weights`): every one of the nine weights + // defaults to 1.0 — blessing the implementation's existing `Default`. + let w = TieBreakingWeights::default(); + for value in [ + w.collision, + w.spacing, + w.slur_shape, + w.beam_slope, + w.vertical_density, + w.system_break, + w.page_fill, + w.casting_off, + w.symbol_density, + ] { + assert_eq!(value, 1.0); + } + } + + #[test] + fn every_axis_has_a_positive_anchor() { + for kind in QUALITY_METRIC_KINDS { + assert!(r_worst(kind) > 0.0, "{kind:?}"); + } + } +} diff --git a/crates/epiphany-layout-ir/src/solver.rs b/crates/epiphany-layout-ir/src/solver.rs index 51cd85c..1e684e0 100644 --- a/crates/epiphany-layout-ir/src/solver.rs +++ b/crates/epiphany-layout-ir/src/solver.rs @@ -13,11 +13,12 @@ //! constraints declared it stays a renderable passthrough but claims no //! satisfaction (see [`StubSolver`]). //! -//! **Quality-metric *computation* is deliberately not implemented** (QUICKSTART: -//! "only the interface — don't implement quality metrics"): the +//! **The stub computes no quality metrics** (QUICKSTART: "only the interface — +//! don't implement quality metrics"): the //! [`QualityMetricVector`]/[`NormalizedMetric`] *types* and the -//! [`TieBreakingWeights`] exist (the interface requires them), but the -//! normalization functions of the Quality Metric Catalog are not. The +//! [`TieBreakingWeights`] exist (the interface requires them), and the Quality +//! Metric Catalog's normative anchors and threshold tables are transcribed in +//! [`crate::quality`] for solvers that do measure (`epiphany-engrave`). The //! `StubSolver` is not a conformant solver and passes no reference suite, so it //! reports the [`SolverTier::Stub`] tier (the honest non-conformance rung, below //! `Minimal`) and an all-worst metric vector. Those values are deliberately @@ -90,8 +91,9 @@ pub struct SolverVersion(pub u32); /// The conformance profile under which to solve (Chapter 9 §"The Solver /// Interface": `SolverConfig.profile` — selects metric thresholds and the active -/// constraint/extension set). The per-profile thresholds live in the Quality -/// Metric Catalog, deferred with the quality metrics. +/// constraint/extension set). The registered profile catalog and each profile's +/// threshold column are the Quality Metric Catalog's Chapter 6, transcribed as +/// [`crate::quality::profile_thresholds`]. #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Debug, Default)] pub enum SolverProfile { /// Fast, low-quality (draft) profile. @@ -104,8 +106,9 @@ pub enum SolverProfile { } /// Tie-breaking weights among layouts of equivalent quality (Chapter 9 -/// §"Quality Metrics": `TieBreakingWeights`). The normative defaults live in the -/// Quality Metric Catalog (deferred); v0 defaults every weight to `1.0`. +/// §"Quality Metrics": `TieBreakingWeights`). The normative defaults are the +/// Quality Metric Catalog's Chapter 4: every weight `1.0` — exactly this +/// type's [`Default`]. #[derive(Copy, Clone, PartialEq, Debug)] pub struct TieBreakingWeights { pub collision: f64, @@ -206,13 +209,14 @@ pub struct ExtensionMetric { } /// The quality metric vector for a layout (Chapter 9 §"Quality Metrics": -/// `QualityMetricVector`). v0 carries the type but computes **no** values: an -/// interface-only solver reports the conservative all-worst placeholder +/// `QualityMetricVector`). An interface-only solver that computes no metrics +/// reports the conservative all-worst placeholder /// ([`QualityMetricVector::unmeasured`], every metric `1.0`), never a measured /// value, so a caller cannot mistake an unmeasured layout for a good one. (The /// derived [`Default`] is all-`0.0`/nominal-best and is *not* what the stub -/// reports; the normalization functions of the Quality Metric Catalog are -/// deferred.) +/// reports.) A measuring solver computes each axis per the Quality Metric +/// Catalog's formulas, normalized through [`crate::quality::normalize`] with +/// the catalog's pinned anchors ([`crate::quality::anchors`]). #[derive(Clone, PartialEq, Debug, Default)] pub struct QualityMetricVector { pub collision_penalty: NormalizedMetric, diff --git a/crates/epiphany-testkit/Cargo.toml b/crates/epiphany-testkit/Cargo.toml index 51d0243..5d75fc3 100644 --- a/crates/epiphany-testkit/Cargo.toml +++ b/crates/epiphany-testkit/Cargo.toml @@ -16,11 +16,17 @@ epiphany-ops.workspace = true # now drives the real crate instead of an in-tree stub. epiphany-layout-ir.workspace = true -# The Chapter 10 performance benches (worklist F1) are the only dev-dependency -# user: the budget-gate logic itself lives in `src/budget.rs` on plain `std`, -# so the library builds without criterion. +# The Chapter 10 performance benches (worklist F1) run under criterion; the +# budget-gate logic itself lives in `src/budget.rs` on plain `std`, so the +# library builds without it. The editor-core + engrave pair drives the +# multi-system click-to-insert regression test (`tests/multisystem_click.rs`) +# over the real casting-off engraver — dev-only, so the library dependency +# graph is unchanged (engrave's own dev-dependency on this crate makes the +# cycle dev-only, which cargo permits). [dev-dependencies] criterion.workspace = true +epiphany-editor-core.workspace = true +epiphany-engrave.workspace = true # Drives the whole suite at scale outside the unit-test timeout — the analogue # of epiphany-determinism's `fuzz_roundtrip` and epiphany-bundle's `fuzz_crash`. diff --git a/crates/epiphany-testkit/DECISIONS.md b/crates/epiphany-testkit/DECISIONS.md index 3b2b4cc..0829d5d 100644 --- a/crates/epiphany-testkit/DECISIONS.md +++ b/crates/epiphany-testkit/DECISIONS.md @@ -211,3 +211,53 @@ once ≥3 ambiguities accumulate (same rule as v0 → Pass 11). Agent H's landin contributed five candidates (P12-H1…P12-H5, recorded in `crates/epiphany-core/DECISIONS.md`), which crosses the threshold, so the batch is open. F does not resolve these; F collects them. + +## F5 — The Reference Suite harness (`src/reference_suite.rs`, 2026-07) + +The Reference Suite companion (v0.1.0) charters the v0.1 entry set — six +scores named by reference-implementation **builder and seed** — and its +non-normative Harness Binding chapter says the executable binding "is +delivered with the reference implementation." This module is that binding, +in the F0 shape: a library module holding the machinery +(`entries`/`evaluate_minimal`/`table`), asserted by +`tests/reference_suite.rs` with **one test per entry** so a failure names its +entry, plus pins for the entry-set shape, the declared A4 default geometry +(the companion's solve-configuration requirement — asserted against +`Engraver::default().geometry()`), and RS-2's builder identity +(`corpus gen_valid_score_rich` ≡ `generators::valid_score_rich(0xF302)`, +byte-for-byte). + +**Solver-parametric on purpose.** The library module takes +`&dyn ConstraintSolver`; the integration test supplies the real `Engraver`. +This keeps `epiphany-engrave` a dev-only dependency (the library dependency +graph is unchanged, mirroring the multi-system click test) while the harness +itself stays reusable against any solver claiming Minimal. + +**The four-condition pass rule, with the F1 Pass/Xfail discipline on +condition 4.** `evaluate_minimal` asserts the companion's per-entry rule +exactly: hard-constraint satisfaction (renderable, non-partial, +`satisfied_hard_constraints`, nothing unsatisfied); internal determinism +(byte-identical `ResolvedLayoutIR` canonical bytes *and* bitwise-identical +metric vectors across repeated solves); a well-formed, accurate report +(Minimal tier claim, every axis a finite `[0,1]` value, never the unmeasured +placeholder); and every axis at or below the Quality Metric Catalog's +Minimal-column threshold. The first real measurement (2026-07) found exactly +one miss: **RS-1's `casting_off_quality` = 1.0** — greedy first-fit leaves a +two-measure stub last system (glyph spans ~78.6/18.8 staff spaces, width CV +0.61 ≥ the 0.5 anchor), the exact failure the axis exists to catch, on a +layout that is byte-locked by the render goldens. Waiving it silently would +fake conformance; failing the workspace would misreport a ratified-spec +tension as a code bug. So condition 4 carries the budget harness's (F1) +discipline: the miss is a **documented `minimal_xfail` row asserted to still +miss** — if the layout or the catalog changes and RS-1 comes within +threshold, the harness fails demanding promotion (remove the row), exactly +like an F1 `XPASS`. The row's resolution is spec-side and tracked in +`epiphany-engrave/DECISIONS.md`'s Pass-12 candidates (casting-off balance +pass with golden regeneration, or a QMC anchor/threshold minor revision — +the catalog's own threshold-tuning open question anticipated this). + +**Eligibility tiers vs. solver tiers.** The corpus `Tier` +(Common/Edge/Torture) is Agent H's eligibility taxonomy; the suite's tiers +(Minimal/Standard) are Chapter 9 conformance tiers. The companion carries the +same caution; the harness resolves corpus entries by `name` string only and +never reads the corpus tier. diff --git a/crates/epiphany-testkit/src/lib.rs b/crates/epiphany-testkit/src/lib.rs index f670e20..083ea0a 100644 --- a/crates/epiphany-testkit/src/lib.rs +++ b/crates/epiphany-testkit/src/lib.rs @@ -108,6 +108,12 @@ pub mod roundtrip; pub mod corpus; pub mod prepass_harness; +// Phase 3: the Reference Suite companion's executable binding — the six-entry +// v0.1 set solved by the real engraver under the declared configuration, with +// the four-condition Minimal pass rule (`tests/reference_suite.rs` asserts it +// per entry). Library-module-per-harness per DECISIONS F0. +pub mod reference_suite; + pub mod convergence; pub mod equivocation; pub mod migration; diff --git a/crates/epiphany-testkit/src/reference_suite.rs b/crates/epiphany-testkit/src/reference_suite.rs new file mode 100644 index 0000000..5a0655e --- /dev/null +++ b/crates/epiphany-testkit/src/reference_suite.rs @@ -0,0 +1,335 @@ +//! The **Reference Suite harness** — the executable binding of the *Reference +//! Suite* companion (v0.1.0) the companion's non-normative Harness Binding +//! chapter says is "delivered with the reference implementation". +//! +//! The six v0.1 entries ([`entries`]) are transcribed from the companion's +//! Chapter 3 ("The v0.1 Entry Set"), each named by reference-implementation +//! builder and seed exactly as the companion's score-referencing rule +//! (`req:refsuite:referencing`) prescribes: a seeded test-kit builder +//! (`fixtures::ten_measure_single_staff`), a core generator the corpus pins +//! (`generators::valid_score_rich` seed `0xF302` = corpus entry +//! `gen_valid_score_rich`), or a zero-argument corpus entry resolved by its +//! `name` string. [`evaluate_minimal`] runs one entry through the standard +//! pipeline (`to_logical` → `to_constrained` → `solve`) under the companion's +//! declared solve configuration — the solver's documented default A4 geometry +//! and the default [`SolverConfig`] (`Standard` profile, unbounded +//! deterministic budget, the Quality Metric Catalog's default tie-breaking +//! weights) — and asserts the companion's four-condition per-entry pass rule +//! (`req:refsuite:pass`) at the **Minimal** tier: +//! +//! 1. every hard constraint satisfied (renderable, non-partial status); +//! 2. internal determinism (byte-identical `ResolvedLayoutIR` canonical bytes +//! *and* bitwise-identical metric vectors across repeated solves); +//! 3. a well-formed, diagnostically accurate report (`Minimal` tier claim, +//! a metric vector that is valid — finite, in `[0,1]` — and computed, +//! never the all-worst placeholder); +//! 4. every normative metric at or below the Quality Metric Catalog's +//! Minimal-column threshold for its axis (no v0.1 entry overrides them). +//! +//! Condition 4 carries the budget harness's **Pass/Xfail discipline** +//! ([`crate::budget`], DECISIONS F1): an axis listed in +//! [`SuiteEntry::minimal_xfail`] is a *documented, measured* threshold miss — +//! asserted to still miss, so the marking cannot rot (an `XPASS` fails the +//! harness demanding promotion), and reported for spec-side resolution rather +//! than silently waived. v0.1 ships exactly one such row (RS-1's +//! `casting_off_quality`; see the entry and the crate's DECISIONS). +//! +//! Following the testkit's library-module-per-harness policy (DECISIONS F0), +//! this module holds the machinery and `tests/reference_suite.rs` asserts it — +//! one test per entry, so a failure names its entry. The module is +//! solver-parametric (the crate's dependency on `epiphany-engrave` is +//! dev-only); the integration test supplies the real `Engraver`. + +use epiphany_core::Score; +use epiphany_layout_ir::{ + to_constrained, to_logical, ConstraintSolver, QualityMetricKind, QualityMetricVector, + SolveStatus, SolverConfig, SolverTier, MINIMAL_THRESHOLDS, QUALITY_METRIC_KINDS, +}; + +use crate::corpus::corpus; +use crate::fixtures; + +/// A documented Minimal-threshold miss (the budget harness's `Xfail` shape): +/// the axis and the reason it is expected to exceed its threshold today. +#[derive(Copy, Clone, Debug)] +pub struct MinimalXfail { + pub axis: QualityMetricKind, + pub reason: &'static str, +} + +/// One v0.1 suite entry (Reference Suite companion, Table "entries"). +pub struct SuiteEntry { + /// The companion's entry id (`RS-1` … `RS-6`). + pub id: &'static str, + /// The companion's entry title. + pub title: &'static str, + /// The companion's construction reference (builder + seed / corpus name). + pub construction: &'static str, + /// Deterministic score construction per that reference. + pub build: fn() -> Score, + /// Documented, measured Minimal-threshold misses (see the module docs). + pub minimal_xfail: &'static [MinimalXfail], +} + +fn corpus_score(name: &str) -> Score { + let fixture = corpus() + .into_iter() + .find(|fixture| fixture.name == name) + .unwrap_or_else(|| panic!("corpus entry {name} named by the Reference Suite is missing")); + (fixture.build)() +} + +fn rs1() -> Score { + fixtures::ten_measure_single_staff(0x000A_11CE) +} +fn rs2() -> Score { + // The companion cites `generators::valid_score_rich(0xF302)`, "identically + // reachable as the test-kit corpus entry `gen_valid_score_rich`" — resolve + // through the corpus and pin the identity in `rs2_construction_reproduces`. + corpus_score("gen_valid_score_rich") +} +fn rs3() -> Score { + corpus_score("b_flat_major_scale") +} +fn rs4() -> Score { + corpus_score("two_voice_counterpoint") +} +fn rs5() -> Score { + corpus_score("notes_and_rests") +} +fn rs6() -> Score { + corpus_score("meter_three_four") +} + +/// The companion's cited construction for RS-2, for the identity pin: the +/// corpus entry must reproduce this score graph bit-for-bit. +pub fn rs2_cited_builder() -> Score { + epiphany_core::generators::valid_score_rich(0xF302) +} + +/// The v0.1 entry set, exactly the six entries of the companion's +/// Table "entries". Every entry is required at the Minimal tier; the same six +/// constitute the Standard subset (not asserted here: no implementation claims +/// Standard as of this suite version). +pub fn entries() -> Vec { + vec![ + SuiteEntry { + id: "RS-1", + title: "Ten-measure single staff", + construction: "fixtures::ten_measure_single_staff(0x000A_11CE)", + build: rs1, + // Measured 2026-07 (engrave v2, QMC v0.1.0 anchors): greedy + // first-fit casting-off leaves a two-measure stub last system + // (glyph spans ~78.6 vs ~18.8 staff spaces, width CV 0.61 >= the + // 0.5 anchor, clamped to 1.0 > the Minimal 0.90 threshold). The + // metric is truthful — this is the exact stub-last-line failure + // the catalog says the axis exists to catch — and the layout is + // byte-locked by the render goldens, so the miss is recorded here + // pending either a casting-off balance pass (a coordinated + // golden-regenerating change) or a QMC anchor/threshold revision + // (the catalog's own threshold-tuning open question). See + // DECISIONS.md. + minimal_xfail: &[MinimalXfail { + axis: QualityMetricKind::CastingOff, + reason: "greedy first-fit leaves a stub last system (width CV \ + 0.61 >= the 0.5 anchor -> 1.0 > 0.90); tracked for a \ + casting-off balance pass or a QMC v0.1 threshold \ + revision", + }], + }, + SuiteEntry { + id: "RS-2", + title: "Rich multi-region score", + construction: "generators::valid_score_rich(0xF302) = corpus gen_valid_score_rich", + build: rs2, + minimal_xfail: &[], + }, + SuiteEntry { + id: "RS-3", + title: "B-flat major scale", + construction: "corpus b_flat_major_scale", + build: rs3, + minimal_xfail: &[], + }, + SuiteEntry { + id: "RS-4", + title: "Two-voice counterpoint", + construction: "corpus two_voice_counterpoint", + build: rs4, + minimal_xfail: &[], + }, + SuiteEntry { + id: "RS-5", + title: "Notes and rests", + construction: "corpus notes_and_rests", + build: rs5, + minimal_xfail: &[], + }, + SuiteEntry { + id: "RS-6", + title: "Three-four meter line", + construction: "corpus meter_three_four", + build: rs6, + minimal_xfail: &[], + }, + ] +} + +/// What evaluating one entry measured, for the report table. +pub struct EntryOutcome { + pub id: &'static str, + pub title: &'static str, + pub status: SolveStatus, + pub metrics: QualityMetricVector, + /// Axes that exceeded their Minimal threshold under a documented xfail row. + pub xfailed: Vec, +} + +/// Evaluates one entry's four-condition **Minimal** pass +/// (`req:refsuite:pass`), panicking with the entry's id on the first violated +/// condition. Returns the measured outcome for the report table. +pub fn evaluate_minimal(solver: &dyn ConstraintSolver, entry: &SuiteEntry) -> EntryOutcome { + let id = entry.id; + // The solve the entry declares: the standard pipeline under the default + // solver configuration (`req:refsuite:solve-config`). The page geometry is + // the solver's construction-time parameter; the integration test pins the + // reference solver's default to the companion's declared A4 numbers. + let constrained = to_constrained(&to_logical(&(entry.build)())); + let config = SolverConfig::default(); + let report = solver.solve(&constrained, &config); + let again = solver.solve(&constrained, &config); + + // Condition 3 (tier claim): the suite evaluates a Minimal-tier claim. + assert_eq!( + solver.tier(), + SolverTier::Minimal, + "{id}: the solver under test must claim the Minimal tier" + ); + + // Condition 1: every hard constraint satisfied. Unsatisfiable and + // budget-exhausted partial solves are failures, not exemptions. + assert!( + matches!( + report.status, + SolveStatus::Solved | SolveStatus::SolvedWithWarnings + ), + "{id}: not a fully solved layout: {:?}", + report.status + ); + assert!( + report.satisfied_hard_constraints, + "{id}: hard constraints unsatisfied" + ); + assert!( + report.unsatisfied_constraints.is_empty(), + "{id}: unsatisfied constraints reported: {:?}", + report.unsatisfied_constraints + ); + + // Condition 2: internal determinism — byte-identical canonical layout and + // bitwise-identical metric vectors across repeated identical solves. + assert_eq!( + report.layout.canonical_bytes(), + again.layout.canonical_bytes(), + "{id}: repeated solves differ in canonical ResolvedLayoutIR bytes" + ); + for kind in QUALITY_METRIC_KINDS { + assert_eq!( + report.metric_vector.axis(kind).0.to_bits(), + again.metric_vector.axis(kind).0.to_bits(), + "{id}: repeated solves differ on {kind:?}" + ); + } + + // Condition 3 (report accuracy): the metric vector is valid and computed + // per the Quality Metric Catalog — never a placeholder. + for kind in QUALITY_METRIC_KINDS { + let value = report.metric_vector.axis(kind).0; + assert!( + value.is_finite() && (0.0..=1.0).contains(&value), + "{id}: {kind:?} = {value} is not a valid NormalizedMetric" + ); + } + assert_ne!( + report.metric_vector, + QualityMetricVector::unmeasured(), + "{id}: the metric vector is the unmeasured placeholder" + ); + + // Condition 4: every normative metric within the Minimal threshold column + // (no v0.1 entry declares an override), under the Pass/Xfail discipline. + let mut xfailed = Vec::new(); + for kind in QUALITY_METRIC_KINDS { + let value = report.metric_vector.axis(kind).0; + let threshold = MINIMAL_THRESHOLDS.axis(kind); + match entry.minimal_xfail.iter().find(|row| row.axis == kind) { + Some(row) => { + assert!( + value > threshold, + "{id}: XPASS on {kind:?} ({value} <= {threshold}) — the measured miss \ + was resolved; promote the entry by removing its xfail row ({})", + row.reason + ); + xfailed.push(kind); + } + None => assert!( + value <= threshold, + "{id}: {kind:?} = {value} exceeds its Minimal threshold {threshold}" + ), + } + } + + EntryOutcome { + id: entry.id, + title: entry.title, + status: report.status, + metrics: report.metric_vector, + xfailed, + } +} + +/// One aligned report row per outcome, for the printed metric table (run the +/// integration test with `--nocapture` to see it). +pub fn table(outcomes: &[EntryOutcome]) -> String { + let mut out = String::new(); + out.push_str(&format!( + "{:<5} {:<24} {:>9} {:>9} {:>9} {:>9} {:>9} {:>9} {:>9} {:>9} {:>9}\n", + "entry", + "title", + "collision", + "spacing", + "slur", + "beam", + "vertical", + "sysbreak", + "pagefill", + "castoff", + "density" + )); + for outcome in outcomes { + let value = |kind: QualityMetricKind| { + let v = outcome.metrics.axis(kind).0; + if outcome.xfailed.contains(&kind) { + format!("{v:.4}*") + } else { + format!("{v:.4}") + } + }; + out.push_str(&format!( + "{:<5} {:<24} {:>9} {:>9} {:>9} {:>9} {:>9} {:>9} {:>9} {:>9} {:>9}\n", + outcome.id, + outcome.title, + value(QualityMetricKind::Collision), + value(QualityMetricKind::Spacing), + value(QualityMetricKind::SlurShape), + value(QualityMetricKind::BeamSlope), + value(QualityMetricKind::VerticalDensity), + value(QualityMetricKind::SystemBreak), + value(QualityMetricKind::PageFill), + value(QualityMetricKind::CastingOff), + value(QualityMetricKind::SymbolDensity), + )); + } + out.push_str("(* = documented Minimal xfail row, asserted to still miss)\n"); + out +} diff --git a/crates/epiphany-testkit/tests/multisystem_click.rs b/crates/epiphany-testkit/tests/multisystem_click.rs new file mode 100644 index 0000000..fa4a161 --- /dev/null +++ b/crates/epiphany-testkit/tests/multisystem_click.rs @@ -0,0 +1,255 @@ +//! Regression: **multi-system click-to-insert** over the real casting-off +//! engraver. +//! +//! Casting-off wraps the ten-measure QUICKSTART fixture into two stacked +//! systems, each baked back to the page's left margin. The editor's click +//! resolution predated casting-off and assumed one flat system, which broke in +//! two ways: the horizontal inverse gathered a region's anchors across *every* +//! system (an x-non-monotonic list, mapping system-2 clicks to system-1 times), +//! and the vertical inverse always found the staff's *first* line segment (the +//! only one that keeps the manifestation stable id), reading system-2 clicks +//! against system 1's origin. These tests pin the system-aware resolution end +//! to end — `EditorSession` over `Engraver::default()` — where the editor-core +//! unit tests use hand-built geometry. + +use std::collections::BTreeMap; + +use epiphany_core::{ + CmnNominal, EventPosition, IdentifiedPitch, MusicalDuration, MusicalPosition, PitchId, + RationalTime, Score, TypedObjectId, +}; +use epiphany_editor_core::{EditorSession, GridResolution}; +use epiphany_engrave::Engraver; +use epiphany_layout_ir::{Point, Rect, ResolvedSystem}; +use epiphany_testkit::fixtures::ten_measure_single_staff; + +/// Every pitch's metric onset, from the score graph (the fixture is 40 quarter +/// notes at `k/4`, one pitch per event — the ground truth a click must recover). +fn pitch_onsets(score: &Score) -> BTreeMap { + let mut onsets = BTreeMap::new(); + let mut pitches: Vec<&IdentifiedPitch> = Vec::new(); + for (_, _, voice) in score.voices() { + for eid in &voice.events { + let Some(event) = score.events.get(*eid) else { + continue; + }; + let EventPosition::Musical(at) = event.position() else { + continue; + }; + pitches.clear(); + event.collect_identified_pitches(&mut pitches); + for ip in &pitches { + onsets.insert(ip.id, at.clone()); + } + } + } + onsets +} + +/// Whether `point` lies within `rect`, edges included. +fn rect_contains(rect: &Rect, point: Point) -> bool { + point.x.0 >= rect.origin.x.0 + && point.x.0 <= rect.origin.x.0 + rect.size.width.0 + && point.y.0 >= rect.origin.y.0 + && point.y.0 <= rect.origin.y.0 + rect.size.height.0 +} + +/// The noteheads rendered inside `bounds`, as `(x, pitch)` in ascending x — the +/// non-synthesized pitch-sourced glyphs the horizontal inverse anchors on. +fn noteheads_within(session: &EditorSession, bounds: &Rect) -> Vec<(f32, PitchId)> { + let mut heads: Vec<(f32, PitchId)> = session + .resolved() + .glyphs + .iter() + .filter(|g| g.provenance.synthesis.is_none() && rect_contains(bounds, g.position)) + .filter_map(|g| match g.provenance.source { + TypedObjectId::Pitch(pid) => Some((g.position.x.0, pid)), + _ => None, + }) + .collect(); + heads.sort_by(|a, b| a.0.total_cmp(&b.0)); + heads +} + +/// A system's staff step origin: the bottom line of its (single) staff **in this +/// system**. The staff record's provenance is that line segment's — the exact +/// world y the vertical inverse must measure from. +fn system_origin_y(session: &EditorSession, system: &ResolvedSystem) -> f32 { + let staff = system + .staves + .first() + .expect("a cast system records its staff"); + session + .resolved() + .strokes + .iter() + .find(|s| s.provenance.stable_id == staff.provenance.stable_id) + .map(|s| s.from.y.0) + .expect("the staff record's bottom line renders") +} + +fn open_two_system_session() -> (EditorSession, BTreeMap) { + let score = ten_measure_single_staff(1); + let onsets = pitch_onsets(&score); + let session = + EditorSession::open(score, Box::new(Engraver::default())).expect("the fixture renders"); + (session, onsets) +} + +fn quarter() -> GridResolution { + GridResolution::quarter() +} + +fn eighth() -> GridResolution { + GridResolution { + step: MusicalDuration(RationalTime::new(1, 8).expect("1/8 is a valid duration")), + } +} + +/// The two systems the A4 default geometry casts the fixture into (the +/// documented `PageGeometry::default` behavior), page 1 top-first. +fn two_systems(session: &EditorSession) -> (Rect, Rect) { + let page = session + .resolved() + .pages + .first() + .expect("the engraver emits a page"); + assert_eq!( + page.systems.len(), + 2, + "A4 default geometry wraps the ten-measure fixture into two systems" + ); + (page.systems[0].bounding_box, page.systems[1].bounding_box) +} + +#[test] +fn a_system_2_click_resolves_to_its_own_time_and_pitch() { + let (session, onsets) = open_two_system_session(); + let (sys1, sys2) = two_systems(&session); + + let sys1_heads = noteheads_within(&session, &sys1); + let sys2_heads = noteheads_within(&session, &sys2); + assert!(!sys1_heads.is_empty() && !sys2_heads.is_empty()); + // Sanity: casting really split the run — system 2 carries strictly later music. + let sys1_max = sys1_heads.iter().map(|(_, p)| &onsets[p]).max().unwrap(); + let sys2_min = sys2_heads.iter().map(|(_, p)| &onsets[p]).min().unwrap(); + assert!(sys2_min > sys1_max, "system 2 renders later onsets"); + + let system2 = &session.resolved().pages[0].systems[1]; + let origin = system_origin_y(&session, system2); + + // (b)+(c): a known system-2 notehead — click its x, one staff space above the + // *system-2* bottom line, and the horizontal inverse must answer that note's + // onset (not the system-1 time the flat x-scale would give, since system 2 + // restarts at the left margin under system 1's x range). + let (x, pid) = sys2_heads[0]; + let expected = onsets[&pid].clone(); + let click = Point::new(x, origin + 1.0); + let gp = session + .position_at(click, &quarter()) + .expect("a metric position under the click"); + assert_eq!( + gp.position, expected, + "a system-2 notehead click snaps to that note's onset" + ); + + // The vertical inverse measures from system 2's own bottom line: one staff + // space above it under the fixture's default treble clef is G4. (Against + // system 1's origin — the regression — the same point is ~20 staff spaces + // below the staff.) + let pitch = session + .staff_pitch_at(click) + .expect("a staff under the click"); + assert_eq!( + (pitch.nominal, pitch.octave), + (CmnNominal::G, 4), + "one staff space above the system-2 bottom line is G4 under treble" + ); + + // A click in the inter-system gutter (just above system 2's box) still + // resolves — the nearest system by vertical distance — and inverts on + // system 2's x-scale. + let gutter = Point::new(x, sys2.origin.y.0 + sys2.size.height.0 + 0.25); + assert!( + gutter.y.0 < sys1.origin.y.0 - 0.25, + "the gutter point is outside both boxes, nearer system 2" + ); + let from_gutter = session + .position_at(gutter, &quarter()) + .expect("a between-systems click still resolves"); + assert_eq!(from_gutter.position, expected); +} + +#[test] +fn a_system_1_click_still_resolves_as_before() { + let (session, onsets) = open_two_system_session(); + let (sys1, _) = two_systems(&session); + let system1 = &session.resolved().pages[0].systems[0]; + let origin = system_origin_y(&session, system1); + + // (e): every system-1 notehead resolves exactly as in the flat layout — its + // own onset, and G4 one staff space above the bottom line. + for (x, pid) in noteheads_within(&session, &sys1) { + let click = Point::new(x, origin + 1.0); + let gp = session + .position_at(click, &quarter()) + .expect("a metric position under the click"); + assert_eq!(gp.position, onsets[&pid], "the click snaps to the onset"); + let pitch = session + .staff_pitch_at(click) + .expect("a staff under the click"); + assert_eq!((pitch.nominal, pitch.octave), (CmnNominal::G, 4)); + } +} + +#[test] +fn insert_into_system_2_empty_space_lands_on_the_clicked_slot() { + let (mut session, onsets) = open_two_system_session(); + let (_, sys2) = two_systems(&session); + + // (d): the fixture fills every quarter, so the empty space inside system 2 is + // the off-beat between two of its noteheads. Click halfway between two + // adjacent system-2 anchors on an eighth grid: the inverse interpolates to + // the half-beat, and the insert must land there — a system-1 inversion would + // put it four-plus measures early. + let (click_x, origin, expected) = { + let heads = noteheads_within(&session, &sys2); + assert!(heads.len() >= 2, "system 2 renders adjacent noteheads"); + let (ax, a_pid) = heads[0]; + let (bx, _) = heads[1]; + let system2 = &session.resolved().pages[0].systems[1]; + let expected = onsets[&a_pid].clone() + + MusicalDuration(RationalTime::new(1, 8).expect("1/8 is a valid duration")); + ( + (ax + bx) / 2.0, + system_origin_y(&session, system2), + expected, + ) + }; + let click = Point::new(click_x, origin + 1.0); + let placed = session + .position_at(click, &eighth()) + .expect("a metric position under the click"); + assert_eq!( + placed.position, expected, + "the click names the off-beat slot" + ); + + let outcome = session + .insert_note_at(click, &eighth()) + .expect("the insert applies (make-room splits the covered quarter)"); + assert!(outcome.graph_changed); + + // The new eighth note exists at the clicked musical position. + let eighth_dur = MusicalDuration(RationalTime::new(1, 8).expect("1/8 is a valid duration")); + let landed = session.score().voices().any(|(_, _, voice)| { + voice.events.iter().any(|eid| { + session.score().events.get(*eid).is_some_and(|event| { + event.position() == &EventPosition::Musical(expected.clone()) + && event.duration() + == &epiphany_core::EventDuration::Musical(eighth_dur.clone()) + }) + }) + }); + assert!(landed, "the inserted eighth note sits at the clicked slot"); +} diff --git a/crates/epiphany-testkit/tests/reference_suite.rs b/crates/epiphany-testkit/tests/reference_suite.rs new file mode 100644 index 0000000..bbd9a4c --- /dev/null +++ b/crates/epiphany-testkit/tests/reference_suite.rs @@ -0,0 +1,113 @@ +//! The Reference Suite companion's v0.1 entry set, asserted against the real +//! engraver: one test per entry (so a failure names its entry), the entry-set +//! shape, the declared solve configuration, and the printed metric table +//! (visible with `--nocapture`). +//! +//! The harness machinery lives in `epiphany_testkit::reference_suite` +//! (library-module-per-harness, DECISIONS F0); this file binds it to +//! `epiphany_engrave::Engraver` — the crate's dev-only dependency — under the +//! companion's declared default A4 geometry and default solver configuration. + +use epiphany_engrave::Engraver; +use epiphany_testkit::reference_suite::{entries, evaluate_minimal, rs2_cited_builder, table}; + +/// The suite's solver under test: the reference engraver at its documented +/// default geometry — which `default_geometry_is_the_declared_a4_configuration` +/// pins to the companion's declared numbers. +fn solver() -> Engraver { + Engraver::default() +} + +fn run(id: &str) { + let entry_set = entries(); + let entry = entry_set + .iter() + .find(|entry| entry.id == id) + .expect("entry id"); + let outcome = evaluate_minimal(&solver(), entry); + print!("{}", table(std::slice::from_ref(&outcome))); +} + +#[test] +fn the_v01_entry_set_is_the_companions_six() { + // Reference Suite companion, Table "entries": exactly RS-1..RS-6, all + // required at Minimal (the harness evaluates every one; none is optional). + let ids: Vec<&str> = entries().iter().map(|entry| entry.id).collect(); + assert_eq!(ids, ["RS-1", "RS-2", "RS-3", "RS-4", "RS-5", "RS-6"]); +} + +#[test] +fn default_geometry_is_the_declared_a4_configuration() { + // The companion's solve-configuration requirement declares every v0.1 + // entry solved at A4 portrait / 8 mm staff: page 105 x 148.5 staff spaces, + // 7.5-staff-space margins, hence a 90 x 133.5 content area. The reference + // engraver's default *is* that geometry; the suite runs on it. + let geometry = solver().geometry(); + assert_eq!(geometry.size.width.0, 105.0); + assert_eq!(geometry.size.height.0, 148.5); + for margin in [ + geometry.margins.top, + geometry.margins.right, + geometry.margins.bottom, + geometry.margins.left, + ] { + assert_eq!(margin.0, 7.5); + } + assert_eq!(geometry.content_width(), 90.0); + assert_eq!(geometry.content_height(), 133.5); +} + +#[test] +fn rs2_construction_reproduces_the_cited_builder() { + // The companion cites `generators::valid_score_rich(0xF302)` and says the + // corpus entry `gen_valid_score_rich` pins the same seed: the two must + // reproduce the same score graph bit-for-bit (builder-and-seed + // referencing, `req:refsuite:referencing`). + let via_corpus = (entries()[1].build)(); + assert_eq!( + via_corpus.canonical_bytes(), + rs2_cited_builder().canonical_bytes() + ); +} + +#[test] +fn rs1_ten_measure_single_staff_passes_minimal() { + run("RS-1"); +} + +#[test] +fn rs2_rich_multi_region_score_passes_minimal() { + run("RS-2"); +} + +#[test] +fn rs3_b_flat_major_scale_passes_minimal() { + run("RS-3"); +} + +#[test] +fn rs4_two_voice_counterpoint_passes_minimal() { + run("RS-4"); +} + +#[test] +fn rs5_notes_and_rests_passes_minimal() { + run("RS-5"); +} + +#[test] +fn rs6_meter_three_four_passes_minimal() { + run("RS-6"); +} + +#[test] +fn minimal_suite_metric_table() { + // The whole suite in one aligned table (run with --nocapture): the + // measured per-entry metric values behind the per-entry passes above. + let solver = solver(); + let outcomes: Vec<_> = entries() + .iter() + .map(|entry| evaluate_minimal(&solver, entry)) + .collect(); + print!("{}", table(&outcomes)); +} diff --git a/spec/PASS12_BATCH.md b/spec/PASS12_BATCH.md index f49bb2f..7935d4c 100644 --- a/spec/PASS12_BATCH.md +++ b/spec/PASS12_BATCH.md @@ -66,6 +66,8 @@ code instead is the failure mode this batch exists to prevent. | P12-I8 | `epiphany-engrave` I | Break-constraint satisfaction predicate: implemented as "a `SystemBreakAt`/`PageBreakAt` is satisfied iff the final layout starts a system/page at that slot" (a region-first slot is trivially satisfied). Ch7/Ch9 never define satisfaction for break constraints; ratify the predicate. | G / Pass 12 (solver) | | P12-I9 | `epiphany-layout-ir` I | Honouring a user break must attribute the decision to its override (`DecisionSource::UserOverride(id)`), but constraints carry no override identity; implemented via a `ConstrainedLayoutIR.break_origins` sidecar populated by `to_constrained`. Bless the sidecar or widen the normalized constraint record. | G / Pass 12 (solver) | | P12-I10 | `epiphany-layout-ir` I | System-spanning strokes split at system boundaries need synthesized provenance for continuation segments; implemented as `SynthesisKind::Registered(SYSTEM_CONTINUATION_SYNTHESIS)` with a deterministic `(original, ordinal)` instance key. Add a first-class continuation synthesis kind or bless the registered id. | G / Pass 12 (provenance) | +| P12-I11 | `epiphany-engrave` I | RS-1 honestly fails the Minimal casting-off threshold under the reference engraver (measured 1.0 vs 0.90): greedy first-fit leaves a two-measure stub last system (width CV 0.6145 ≥ the 0.5 anchor). Resolutions: an engrave-side casting-off balance pass (golden regeneration + solver version bump), or a Quality Metric Catalog minor revision (anchor rescale / Minimal relaxation / RS-1 per-entry override). Tracked bidirectionally by the suite harness's asserted Xfail row. | G / Pass 12 (quality) | +| P12-I12 | `epiphany-engrave` I | The Standard-tier spacing floor warns on short healthy scores: 3–8-column entries with a wide clef/key lead measure spacing CV 0.36–0.41 > the 0.32 Standard floor. Consider a lead-aware or duration-aware refinement of the spacing_distortion raw measurement (the catalog's optical-spacing open question). | G / Pass 12 (quality) | ## Not yet open elsewhere @@ -76,6 +78,9 @@ spec-compliance audit follow-up, alongside K3/K4). The 2026-07 Push-3 wiring work added C1..C4 (re-anchoring), D1 (bundle operation index), and E1..E5 (edit barriers). The Phase-3 first tranche (casting-off + K1 schema-fill + value-restoring undo, 2026-07-02) added C5, K8..K11, and I7..I10. +The second tranche (Quality Metric Catalog 0.1.0 + Reference Suite 0.1.0 + +real engraver metrics + the suite harness + the multi-system click fix, +2026-07-03) added I11..I12. Agent J's Binary Format companion now exists (`spec/binary_format.tex`, v0.1.0): it ratified the P12-D1/E1/E2/E3 inputs (struck through above) and discharged the crates' provisional-codec notes diff --git a/spec/quality_metric_catalog.pdf b/spec/quality_metric_catalog.pdf new file mode 100644 index 0000000..2eb9ade Binary files /dev/null and b/spec/quality_metric_catalog.pdf differ diff --git a/spec/quality_metric_catalog.tex b/spec/quality_metric_catalog.tex new file mode 100644 index 0000000..87904bf --- /dev/null +++ b/spec/quality_metric_catalog.tex @@ -0,0 +1,1308 @@ +% !TEX program = xelatex +% +% Epiphany --- Quality Metric Catalog (companion specification) +% Companion to the Core Specification. Compile with XeLaTeX. +% +% This document is versioned independently of the Core Specification +% (independent semver; see the Versioning note in the front matter). Its preamble +% is intentionally a self-contained copy of the core specification's preamble so +% the two documents build independently; factoring a shared preamble file is a +% later cleanup, not a v0.1 deliverable. + +\documentclass[11pt,letterpaper]{report} + +% --------------------------------------------------------------------------- +% Packages +% --------------------------------------------------------------------------- +\usepackage{fontspec} +\usepackage{geometry} +\geometry{ + letterpaper, + top=1.05in, + bottom=1.05in, + left=1.15in, + right=1.15in, + headheight=15pt +} + +\usepackage[english]{babel} +\usepackage{microtype} +\usepackage{parskip} +\usepackage{xcolor} +\usepackage{hyperref} +\usepackage{enumitem} +\usepackage{titlesec} +\usepackage{fancyhdr} +\usepackage{booktabs} +\usepackage{array} +\usepackage{longtable} +\usepackage{listings} +\usepackage{amsmath} +\usepackage{amssymb} +\usepackage{tcolorbox} +\tcbuselibrary{breakable, skins} + +% --------------------------------------------------------------------------- +% Color palette (shared with the core specification) +% --------------------------------------------------------------------------- +\definecolor{epiphanyteal}{HTML}{1A4044} +\definecolor{epiphanygold}{HTML}{8E6E2E} +\definecolor{epiphanyink}{HTML}{1F1B16} +\definecolor{epiphanyslate}{HTML}{6B6660} +\definecolor{epiphanycream}{HTML}{F8F4ED} +\definecolor{epiphanymist}{HTML}{ECE8E0} +\definecolor{epiphanycode}{HTML}{2A2520} +\definecolor{epiphanycrimson}{HTML}{7A2424} + +\hypersetup{ + colorlinks=true, + linkcolor=epiphanyteal, + citecolor=epiphanyteal, + urlcolor=epiphanygold, + pdftitle={Epiphany --- Quality Metric Catalog}, + pdfauthor={The Epiphany Project}, + pdfsubject={Quality Metric Catalog companion for the Epiphany music notation platform}, + pdfkeywords={music notation, engraving, quality metrics, normalization, conformance tiers, solver profiles}, + bookmarksnumbered=true, + bookmarksopen=true +} + +% --------------------------------------------------------------------------- +% Typography (shared with the core specification) +% --------------------------------------------------------------------------- +\setmainfont{TeX Gyre Pagella}[Numbers={OldStyle, Proportional}, Ligatures={TeX, Common}] +\setsansfont{TeX Gyre Heros}[Scale=0.94, Ligatures={TeX, Common}] +\setmonofont{TeX Gyre Cursor}[Scale=0.88, Ligatures={TeX}] +\newfontfamily\titlefont{TeX Gyre Pagella}[Numbers={OldStyle}, Ligatures={TeX, Common}] +\newcommand{\tablenums}[1]{{\addfontfeatures{Numbers={Lining,Tabular}}#1}} +\newcommand{\sectionsc}[1]{{\addfontfeatures{Letters=SmallCaps}#1}} + +% --------------------------------------------------------------------------- +% Section styling (shared with the core specification) +% --------------------------------------------------------------------------- +\titleformat{\chapter}[display] + {\normalfont\filright} + {\raggedright\color{epiphanygold}\fontsize{14pt}{16pt}\selectfont + \scshape Chapter\ \thechapter} + {16pt} + {\raggedright\color{epiphanyteal}\fontsize{32pt}{36pt}\selectfont\bfseries} + [\vspace{4pt}{\color{epiphanygold}\rule{2in}{0.6pt}}] +\titlespacing*{\chapter}{0pt}{-20pt}{30pt} +\titleformat{\section} + {\normalfont\Large\bfseries\color{epiphanyteal}} + {\color{epiphanygold}\thesection}{1em}{} +\titleformat{\subsection} + {\normalfont\large\bfseries\color{epiphanyteal}} + {\color{epiphanygold}\thesubsection}{1em}{} +\titleformat{\subsubsection} + {\normalfont\normalsize\bfseries\color{epiphanyink}} + {\thesubsubsection}{1em}{} + +% --------------------------------------------------------------------------- +% Headers and footers (shared with the core specification) +% --------------------------------------------------------------------------- +\pagestyle{fancy} +\fancyhf{} +\renewcommand{\headrulewidth}{0pt} +\renewcommand{\footrulewidth}{0pt} +\fancyhead[L]{\small\scshape\color{epiphanyslate}Epiphany --- Quality Metric Catalog} +\fancyhead[R]{\small\itshape\color{epiphanyslate}\leftmark} +\fancyfoot[C]{\small\color{epiphanyslate}\thepage} +\renewcommand{\headrule}{ + \color{epiphanygold!50}\hrule width\headwidth height 0.4pt + \vspace{1pt} + \color{epiphanygold!30}\hrule width\headwidth height 0.2pt +} + +% --------------------------------------------------------------------------- +% Code listing style (shared with the core specification) +% --------------------------------------------------------------------------- +\lstdefinelanguage{Rust}{ + keywords={fn,let,mut,pub,struct,enum,impl,trait,for,in,if,else,match,return, + use,mod,crate,self,Self,as,where,move,async,await,const,static, + ref,type,unsafe,extern,dyn,box,break,continue,loop,while}, + keywordstyle=\color{epiphanyteal}\bfseries, + ndkeywords={i8,i16,i32,i64,i128,u8,u16,u32,u64,u128,f32,f64,bool,char,str, + String,Vec,Option,Result,Box,Rc,Arc,HashMap,BTreeMap, + NonZeroU16,NonZeroU32,NonZeroU64,Duration,Timestamp}, + ndkeywordstyle=\color{epiphanygold}\bfseries, + sensitive=true, + comment=[l]{//}, + morecomment=[s]{/*}{*/}, + commentstyle=\color{epiphanyslate}\itshape, + stringstyle=\color{epiphanycrimson}, + morestring=[b]", + morestring=[b]' +} +\lstset{ + basicstyle=\ttfamily\small\color{epiphanycode}, + backgroundcolor=\color{epiphanycream}, + frame=leftline, + rulecolor=\color{epiphanygold!60}, + framesep=8pt, + framerule=1.5pt, + xleftmargin=10pt, + xrightmargin=4pt, + breaklines=true, + showstringspaces=false, + numberstyle=\tiny\color{epiphanyslate}, + numbersep=10pt, + captionpos=b, + aboveskip=10pt, + belowskip=10pt, + language=Rust +} + +% --------------------------------------------------------------------------- +% Custom environments (shared with the core specification) +% --------------------------------------------------------------------------- +\newtcolorbox{openquestion}[1][]{ + enhanced, breakable, + colback=epiphanymist, colframe=epiphanycrimson, + fonttitle=\bfseries\color{white}, title={\scshape\hspace{2pt}Open Question}, + coltitle=white, colbacktitle=epiphanycrimson, + arc=1pt, boxrule=0pt, leftrule=2pt, + left=10pt, right=10pt, top=8pt, bottom=8pt, + attach boxed title to top left={xshift=0pt, yshift=0pt}, + boxed title style={arc=0pt, sharp corners, boxrule=0pt, left=6pt, right=8pt, top=2pt, bottom=2pt}, + #1 +} +\newtcolorbox{rationale}[1][]{ + enhanced, breakable, + colback=epiphanymist, colframe=epiphanyteal, + fonttitle=\bfseries\color{white}, title={\scshape\hspace{2pt}Rationale}, + coltitle=white, colbacktitle=epiphanyteal, + arc=1pt, boxrule=0pt, leftrule=2pt, + left=10pt, right=10pt, top=8pt, bottom=8pt, + attach boxed title to top left={xshift=0pt, yshift=0pt}, + boxed title style={arc=0pt, sharp corners, boxrule=0pt, left=6pt, right=8pt, top=2pt, bottom=2pt}, + #1 +} +\newtcolorbox{requirement}[1][]{ + enhanced, breakable, + colback=white, colframe=epiphanygold, + fonttitle=\bfseries\color{white}, title={\scshape\hspace{2pt}Requirement}, + coltitle=white, colbacktitle=epiphanygold, + arc=1pt, boxrule=0pt, leftrule=2pt, + left=10pt, right=10pt, top=8pt, bottom=8pt, + attach boxed title to top left={xshift=0pt, yshift=0pt}, + boxed title style={arc=0pt, sharp corners, boxrule=0pt, left=6pt, right=8pt, top=2pt, bottom=2pt}, + #1 +} +\newtcolorbox{nongoal}[1][]{ + enhanced, breakable, + colback=epiphanymist, colframe=epiphanyslate, + fonttitle=\bfseries\color{white}, title={\scshape\hspace{2pt}Non-Goal}, + coltitle=white, colbacktitle=epiphanyslate, + arc=1pt, boxrule=0pt, leftrule=2pt, + left=10pt, right=10pt, top=8pt, bottom=8pt, + attach boxed title to top left={xshift=0pt, yshift=0pt}, + boxed title style={arc=0pt, sharp corners, boxrule=0pt, left=6pt, right=8pt, top=2pt, bottom=2pt}, + #1 +} + +\newcommand{\MUST}{\textbf{MUST}} +\newcommand{\MUSTNOT}{\textbf{MUST}\nobreak\ \textbf{NOT}} +\newcommand{\SHOULD}{\textbf{SHOULD}} +\newcommand{\SHOULDNOT}{\textbf{SHOULD}\nobreak\ \textbf{NOT}} +\newcommand{\MAY}{\textbf{MAY}} + +\setlist[itemize]{topsep=2pt, itemsep=3pt, parsep=0pt} +\setlist[enumerate]{topsep=2pt, itemsep=3pt, parsep=0pt} +\setlist[description]{topsep=2pt, itemsep=5pt, parsep=0pt} +\AtBeginDocument{\color{epiphanyink}} + +% --------------------------------------------------------------------------- +% Document +% --------------------------------------------------------------------------- +\begin{document} + +\begin{titlepage} + \thispagestyle{empty} + \centering + \vspace*{2.2in} + {\color{epiphanygold}\rule{3in}{0.8pt}}\\[18pt] + {\titlefont\fontsize{34pt}{38pt}\selectfont\color{epiphanyteal}\bfseries Epiphany}\\[10pt] + {\Large\scshape\color{epiphanyslate}Quality Metric Catalog}\\[6pt] + {\large\itshape\color{epiphanyslate}A companion to the Core Specification}\\[14pt] + {\color{epiphanygold}\rule{3in}{0.8pt}}\\[24pt] + {\normalsize\color{epiphanyink}Version 0.1.0 --- Phase 3 (the normative metric set: formal definitions, normalization, weights, tier thresholds, profile registry)}\\[4pt] + {\small\color{epiphanyslate}Normative for the metrics and thresholds it defines} + \vfill +\end{titlepage} + +\tableofcontents + +% =========================================================================== +\chapter{About This Companion} +\label{ch:about} + +The \emph{Quality Metric Catalog} is a companion to the Epiphany Core +Specification. It fulfils the delegation of the core specification's +\sectionsc{Companion Specifications} appendix --- the section labeled +\texttt{sec:deferred:companions} --- which charters this document to +deliver ``per-metric normalization functions mapping raw measurements to +\texttt{NormalizedMetric} values, default tie-breaking weights, per-tier +metric thresholds, and the formal definition of each quality metric in the +normative metric set.'' + +This release (v0.1.0) delivers all four chartered items, plus two small +registries the core specification names but defers here: + +\begin{itemize} + \item the formal definition of each of the \textbf{nine normative metric + axes} --- the measured phenomenon, the raw measurement over resolved + layout geometry, and the normalization function with its pinned anchor + constant (Chapter~\ref{ch:metrics}); + \item the \textbf{default tie-breaking weights} + (Chapter~\ref{ch:weights}); + \item the \textbf{per-tier metric thresholds} for the Minimal and + Standard conformance tiers, the Advanced-tier extension rule, and the + \texttt{QualityFloorApproached} warning trigger + (Chapter~\ref{ch:thresholds}); + \item the \texttt{QualityMetricKind} enumeration, which the core + specification references (as the payload of the + \texttt{QualityFloorApproached} solver warning) but never lists + (Section~\ref{sec:model:kind}); + \item the \textbf{registered \texttt{SolverProfile} catalog}, which the + core specification's vocabulary appendix explicitly defers to this + companion (Chapter~\ref{ch:profiles}); + \item the \textbf{Standard-tier constraint family} declaration, which the + core specification's Standard-tier requirement points at this companion + (Section~\ref{sec:thresholds:families}). +\end{itemize} + +This document does \emph{not} cover: + +\begin{itemize} + \item the reference suite's test scores, per-tier entry inclusion, and any + per-entry threshold overrides --- those are the \emph{Reference Suite} + companion's; + \item performance conformance (edit traces, frame budgets) --- the + \emph{Performance Reference Suite} companion's; + \item the reference solving algorithm --- the non-normative + \emph{Reference Algorithm} companion's. +\end{itemize} + +\section{Relationship to the Core Specification} +\label{sec:about:relationship} + +This companion does not restate the metric framework; it \emph{references} +it. The framework --- the \texttt{NormalizedMetric} validity rules (finite, +in $[0.0, 1.0]$, lower is better), the \texttt{QualityMetricVector} field +set, extension metrics, the \texttt{TieBreakingWeights} structure, the +Pareto-frontier design target, the conformance-tier ladder, and the +suite-based conformance model --- is the core specification's Chapter~9 +(\sectionsc{The Constraint Solver Interface}, the \texttt{ch:solver} +chapter), in particular its \sectionsc{Quality Metrics}, +\sectionsc{Conformance Tiers}, and \sectionsc{Conformance: The Reference +Suite} sections (\texttt{sec:solver:quality}, +\texttt{sec:solver:tiers}, \texttt{sec:solver:conformance}). + +Two core requirements bind this document into the conformance story: + +\begin{itemize} + \item The core \sectionsc{Quality Metrics} normalization requirement: + ``Per-metric normalization functions (mapping raw measurements to + $[0.0,1.0]$) are specified in the Quality Metric Catalog companion + document. Implementations \MUST{} use the catalog's normalization; + arbitrary normalization is non-conforming.'' Chapter~\ref{ch:metrics} + is that normalization. + \item The core tie-breaking requirement: ``Tie-breaking weights \MUST{} + have normative defaults specified in the Quality Metric Catalog.'' + Chapter~\ref{ch:weights} is those defaults. +\end{itemize} + +Where this document and a ratified core requirement disagree, \textbf{the +core requirement governs} and the discrepancy is a defect in this document. +Graph types, the layout IR pipeline +(\texttt{LogicalLayoutIR} $\rightarrow$ \texttt{ConstrainedLayoutIR} +$\rightarrow$ \texttt{ResolvedLayoutIR}), +the spring-slot and vertical-band models, and the built-in +\texttt{LayoutConstraint} kinds are the core specification's Chapter~7 +(\texttt{ch:layout-ir}); this document's formulas range over those +structures without redefining them. + +\begin{rationale} +\textbf{Versioning.} This companion is versioned independently of the core +specification (independent semver), like the Operation Catalog and the +Binary Format companions. Metric definitions and thresholds are expected to +be tuned on a faster cadence than the solver framework: threshold revisions +informed by reference-suite experience are \textsc{minor} revisions here and +require no core-spec change, while a change to the metric \emph{field set} +(a new normative axis) is a core-spec change first, mirrored here. +\end{rationale} + +\section{Conformance} +\label{sec:about:conformance} + +The metric definitions, normalization functions, default weights, threshold +tables, and profile registry in this document are \textbf{normative}. A +solver that reports a \texttt{QualityMetricVector} computed by any function +other than the ones defined here is non-conforming, per the core +\sectionsc{Quality Metrics} requirement quoted above. + +Conformance \emph{claims} are evaluated on the Reference Suite companion's +entry set: a solver claiming tier $T$ must keep every normative metric +within tier $T$'s threshold (Chapter~\ref{ch:thresholds}) on every suite +entry required at tier $T$. This document defines \emph{what is measured +and how much is tolerable}; the Reference Suite companion defines +\emph{on which scores}. + +Two boundaries of that claim, developed in Chapter~\ref{ch:model}: + +\begin{itemize} + \item Metric values are \emph{diagnostic}, never canonical state + (Section~\ref{sec:model:diagnostic}). No byte of canonical document + state depends on them. + \item Numeric agreement across implementations is \emph{not} required + (Section~\ref{sec:model:determinism}). The cross-implementation + contract is threshold conformance, not value equality. +\end{itemize} + +% =========================================================================== +\chapter{The Metric Model} +\label{ch:model} + +\section{Diagnostic Status} +\label{sec:model:diagnostic} + +The quality metric vector rides on the \texttt{SolveReport} (core +specification Chapter~9, \sectionsc{The Solver Report}: +\texttt{SolveReport.metric\_vector}). It describes the layout; it is not +part of the layout. The solver's canonical output --- +\texttt{ResolvedLayoutIR} --- carries no metric field, and the core +specification's observational-equivalence rule is stated over +\texttt{ResolvedLayoutIR} bytes alone. + +\begin{requirement} +\label{req:qmc:diagnostic} +Quality metrics are \textbf{diagnostic output}, never canonical state. + +\begin{itemize} + \item A \texttt{QualityMetricVector} appears only on the + \texttt{SolveReport}. The canonical serialized form of + \texttt{ResolvedLayoutIR} \MUSTNOT{} contain quality-metric values, + and a \texttt{NormalizedMetric} value \MUSTNOT{} enter canonical + document bytes by any other path. + \item Two solves whose \texttt{ResolvedLayoutIR} values are + byte-identical under canonical serialization are observationally + equivalent regardless of their metric vectors. A metric value + \MUSTNOT{} be an input to any canonical-state decision. +\end{itemize} +\end{requirement} + +\begin{rationale} +Keeping metrics off the canonical path is what makes them safely +improvable. A solver revision that measures more honestly (or a catalog +revision that tunes a formula) changes reports, warnings, and conformance +verdicts --- but not one byte of any document. The reference implementation +already has this shape: \texttt{ResolvedLayoutIR} has no metric field, the +\texttt{SolveReport} is never serialized, and no consumer reads the vector +to make a state decision. +\end{rationale} + +\section{Determinism and Numeric Agreement} +\label{sec:model:determinism} + +\begin{requirement} +\label{req:qmc:determinism} +Within one implementation version, metric computation \MUST{} be +deterministic: identical solve inputs (the same +\texttt{ConstrainedLayoutIR}, configuration, and declared page geometry) +\MUST{} yield bitwise-identical \texttt{QualityMetricVector} values. + +Across implementations (and across versions of one implementation), +numeric agreement is \textbf{not} required. Two conforming solvers \MAY{} +report different metric values for the same score; the +cross-implementation contract is the core specification's four +suite-conformance conditions --- in particular, that every metric is within +the claimed tier's threshold on every required suite entry --- not value +equality. + +Metric values are ordinary IEEE~754 \texttt{f64} values subject to the +core \texttt{NormalizedMetric} validity rules (finite, in $[0.0, 1.0]$). +This document imposes no additional quantization, rounding, or evaluation- +order discipline on their computation. +\end{requirement} + +\begin{rationale} +Different conforming solvers legitimately produce different layouts, so +their metric values differ even under identical formulas; demanding numeric +agreement would smuggle cross-implementation layout equality in through the +diagnostics. Within-implementation determinism, by contrast, is load- +bearing: reproducible reports are what make threshold conformance testable +and regressions attributable. +\end{rationale} + +\section{The Normative Metric Set and \texttt{QualityMetricKind}} +\label{sec:model:kind} + +The nine normative metric axes are the nine non-extension fields of the +core specification's \texttt{QualityMetricVector}. The core references a +\texttt{QualityMetricKind} enumeration (the payload of +\texttt{SolverWarningKind::QualityFloorApproached}) without listing it; +this catalog pins it. + +\begin{requirement} +\label{req:qmc:kind} +The \texttt{QualityMetricKind} enumeration is exactly: + +\begin{lstlisting}[language=Rust] +pub enum QualityMetricKind { + Collision, + Spacing, + SlurShape, + BeamSlope, + VerticalDensity, + SystemBreak, + PageFill, + CastingOff, + SymbolDensity, +} +\end{lstlisting} + +Each kind names exactly one \texttt{QualityMetricVector} field and exactly +one \texttt{TieBreakingWeights} field, per +Table~\ref{tab:kind-mapping}. Extension metrics are not +\texttt{QualityMetricKind} values; they are identified by +\texttt{ExtensionMetricId}. +\end{requirement} + +\begin{table}[h] +\centering +\small +\begin{tabular}{lll} +\toprule +\textbf{Kind} & \textbf{Vector field} & \textbf{Weight field} \\ +\midrule +\texttt{Collision} & \texttt{collision\_penalty} & \texttt{collision} \\ +\texttt{Spacing} & \texttt{spacing\_distortion} & \texttt{spacing} \\ +\texttt{SlurShape} & \texttt{slur\_shape\_penalty} & \texttt{slur\_shape} \\ +\texttt{BeamSlope} & \texttt{beam\_slope\_penalty} & \texttt{beam\_slope} \\ +\texttt{VerticalDensity} & \texttt{vertical\_density\_penalty} & \texttt{vertical\_density} \\ +\texttt{SystemBreak} & \texttt{system\_break\_penalty} & \texttt{system\_break} \\ +\texttt{PageFill} & \texttt{page\_fill\_efficiency} & \texttt{page\_fill} \\ +\texttt{CastingOff} & \texttt{casting\_off\_quality} & \texttt{casting\_off} \\ +\texttt{SymbolDensity} & \texttt{symbol\_density\_uniformity} & \texttt{symbol\_density} \\ +\bottomrule +\end{tabular} +\caption{The nine normative axes: kind, vector field, tie-breaking weight.} +\label{tab:kind-mapping} +\end{table} + +A naming caution: three field names read as higher-is-better words --- +\begin{center} +\texttt{page\_fill\_efficiency},\ \texttt{casting\_off\_quality},\ \texttt{symbol\_density\_uniformity} +\end{center} +--- but they are not. The core specification fixes the orientation of +\emph{every} normative metric ($0.0$ best, $1.0$ worst tolerable), and +the definitions in Chapter~\ref{ch:metrics} follow it: each of the three +measures a \emph{deficiency} (unfilled page area, uneven casting-off, +uneven density). + +\section{The Measurement Domain} +\label{sec:model:domain} + +Every raw measurement in Chapter~\ref{ch:metrics} is a deterministic +function of three inputs, all of which exist at the moment the solver +assembles its \texttt{SolveReport}: + +\begin{enumerate} + \item the solve's resolved output $L$ (a \texttt{ResolvedLayoutIR}: + positioned glyphs with bounding boxes, strokes, and the page/system + tree); + \item the solve's constrained input $C$ (a \texttt{ConstrainedLayoutIR}: + horizontal spring slots, vertical bands, declared constraints); + \item the declared page geometry the solve was configured with: the + content width $W$ and content height $H$, in staff spaces. (The score + graph has no home for page geometry yet --- the core names + \texttt{Canvas.layout\_defaults} without defining it, tracked as + Pass-12 row P12-I7 --- so the geometry is a solver parameter, and the + Reference Suite companion requires each suite entry to declare it.) +\end{enumerate} + +Notation used throughout Chapter~\ref{ch:metrics}: + +\begin{itemize} + \item $G$ is the set of resolved glyphs of $L$. For $g \in G$, the + \emph{ink box} $B(g) = [l_g, r_g] \times [b_g, t_g]$ is the glyph's + bounding box translated to its resolved position. Strokes (staff + lines, ledger lines, stems, barline strokes) are not members of $G$. + \item $\mathit{sys}(g)$ is the system that positioned $g$ under the + solve's casting-off; every system belongs to exactly one region, and + every page carries an ordered list of systems. A glyph positioned by + no system belongs to no collision pair and to no per-system + aggregate. + \item $\mathit{slot}(g)$ is the horizontal spring slot of $g$'s source + glyph in $C$ --- the musical time column that groups a chord's + noteheads with their accidentals, dots, and same-column symbols. + \item For a system $s$: its \emph{columns} are the ascending sequence of + distinct resolved baseline $x$-coordinates + $x^s_1 < \dots < x^s_{m_s}$ of the glyph-bearing slots realized in + $s$; its \emph{advances} are $a^s_i = x^s_{i+1} - x^s_i$ for + $i = 1, \dots, m_s - 1$ (equivalently, the spacing pass's per-slot + advances); $w_s$ is the width of $s$'s content extent (the horizontal + span of the ink boxes assigned to $s$); $n_s$ is the number of glyphs + assigned to $s$. + \item $\mathrm{CV}(v_1, \dots, v_k)$, defined for $k \ge 2$ with + $\operatorname{mean} > 0$, is the population standard deviation + divided by the arithmetic mean. + \item The arithmetic mean over an \emph{empty} index set is defined as + $0$ (this is the vacuous-geometry rule of + Section~\ref{sec:model:vacuous} in aggregate form). +\end{itemize} + +Because numeric agreement across implementations is not required +(Requirement~\ref{req:qmc:determinism}), a formula may reference the +solve's \emph{own} internal assignments --- which glyph landed in which +system, which columns a system realizes --- without threatening +conformance: the assignments are deterministic within an implementation +version, which is all the metric contract needs. No formula in this +catalog requires an optical-spacing model, font metrics beyond glyph +bounding boxes, or any geometry class the layout pipeline does not +produce. + +\section{The Vacuous-Geometry Rule} +\label{sec:model:vacuous} + +Each axis in Chapter~\ref{ch:metrics} names its \emph{contributing units}: +the glyph pairs, systems, pages, gaps, slurs, or beams the raw measurement +ranges over. A layout may simply not contain a metric's geometry class --- +no drawn slurs, no beams, a single system, a single page. + +\begin{requirement} +\label{req:qmc:vacuous} +When a normative metric's contributing-unit set is empty for a given +layout, the metric \MUST{} evaluate to exactly $0.0$: where there is +nothing to penalize, the penalty is zero. In particular: + +\begin{itemize} + \item a layout containing no drawn slur geometry has + $\texttt{slur\_shape\_penalty} = 0.0$; + \item a layout containing no drawn beam geometry has + $\texttt{beam\_slope\_penalty} = 0.0$; + \item a region cast onto a single system contributes no units to + \texttt{system\_break\_penalty}, \texttt{casting\_off\_quality}, or + \texttt{symbol\_density\_uniformity}, and a single-page layout + contributes no units to \texttt{page\_fill\_efficiency} --- each axis + degenerates exactly as its per-axis definition states; + \item a solve configured without positive finite content bounds ($W$ or + $H$) has an empty contributing set for every axis defined over that + bound. +\end{itemize} + +An implementation \MUSTNOT{} report a sentinel (such as $1.0$) for a +metric whose contributing-unit set is empty. The all-worst placeholder +vector remains correct only for a solver that \emph{computes no metrics at +all} and claims no conformance tier (the core's \texttt{Stub} tier). +\end{requirement} + +\begin{openquestion} +\textbf{The notated-but-unrendered honesty edge.} A score whose +\emph{source} notates slurs, engraved by a solver that draws no slur +geometry, scores $\texttt{slur\_shape\_penalty} = 0.0$ under this rule --- +the axis sees no drawn slurs and finds nothing to penalize, even though +the output is arguably \emph{worse} than a badly-drawn slur. v0.1 +deliberately pins vacuous-$0.0$: the metric axes evaluate the geometry the +solver produced, and \emph{rendering completeness} --- whether notated +content is realized at all --- is governed by constraint families and +visual acceptance testing, not by the quality metrics. Should a future +revision instead score notated-but-unrendered geometry classes at the +worst value, so that the metric vector cannot flatter an incomplete +renderer? Resolving this requires a normative definition of ``notated +content that demands drawn geometry,'' which does not exist yet. +\end{openquestion} + +\section{Normalization Form} +\label{sec:model:normalization} + +Every normative axis uses the same one-parameter normalization shape, so +that anchors --- not curve families --- are the entire tuning surface. + +\begin{requirement} +\label{req:qmc:normalization-form} +Each normative metric defines a raw measurement +$\mathit{raw} \ge 0$ (dimensionless, per its axis definition) and a pinned +anchor constant $R_{\mathrm{worst}} > 0$. The normalized value is the +clamped-linear map +\[ + n \;=\; \min\!\left(1,\; \frac{\mathit{raw}}{R_{\mathrm{worst}}}\right), +\] +so that $\mathit{raw} = 0$ (the ideal) normalizes to $0.0$ and +$\mathit{raw} \ge R_{\mathrm{worst}}$ (the worst-tolerable anchor and +beyond) normalizes to $1.0$. Implementations \MUST{} use the per-axis raw +measurements and anchors of Chapter~\ref{ch:metrics} exactly; per the core +specification, arbitrary normalization is non-conforming. Extension +metrics \MAY{} use other normalization shapes but \MUSTNOT{} change +orientation or range. +\end{requirement} + +% =========================================================================== +\chapter{The Nine Normative Metrics} +\label{ch:metrics} + +Each section below defines one axis under a fixed template: the +\emph{phenomenon} (what an engraver would point at), the \emph{contributing +units} (what the raw measurement ranges over --- the set whose emptiness +triggers Requirement~\ref{req:qmc:vacuous}), the \emph{raw measurement}, +and the \emph{normalization anchor} with a brief justification. All +lengths are in staff spaces; all raw measurements are dimensionless +ratios. + +Four axes measure horizontal-distribution phenomena at different +granularities, and the boundaries are deliberate: + +\begin{itemize} + \item \texttt{spacing\_distortion} is \emph{within-system} advance + regularity; + \item \texttt{system\_break\_penalty} is the \emph{per-break} absolute + cost of each chosen system break (looseness or overflow of + non-final systems); + \item \texttt{casting\_off\_quality} is \emph{across-system} width + evenness, including the final system (the stub-last-line failure); + \item \texttt{symbol\_density\_uniformity} is \emph{across-system} + crowding evenness (equal widths can hide very different symbol + densities). +\end{itemize} + +\section{\texttt{collision\_penalty}} +\label{sec:metrics:collision} + +\textbf{Phenomenon.} Overlapping ink between symbols that belong to +different musical time columns: a notehead striking the previous column's +accidental, a chord symbol over a barline, any cross-column ink contact. +Professional engraving contains none. + +\begin{requirement} +\label{req:qmc:collision} +\textbf{Contributing units:} unordered glyph pairs $\{g, h\} \subseteq G$ +with $\mathit{sys}(g) = \mathit{sys}(h)$ and +$\mathit{slot}(g) \ne \mathit{slot}(h)$. + +A pair \emph{collides} when its ink boxes intersect with positive area in +both axes: +\[ +\begin{gathered} + \min(r_g, r_h) - \max(l_g, l_h) > 0 + \quad\text{and}\\ + \min(t_g, t_h) - \max(b_g, b_h) > 0 . +\end{gathered} +\] +Edge-touching boxes do not collide. Pairs sharing a horizontal spring slot +are \textbf{excluded}: a column's internal cluster --- a chord's noteheads, +their accidentals, dots, and other same-slot symbols --- is arranged by the +constrained stage, and its legitimate internal ink contact is not a +spacing failure of the solver. Strokes are not glyphs and join no pair: +staff lines legitimately cross every notehead. + +\textbf{Raw measurement:} with $P$ the set of colliding pairs, +\[ + \mathit{raw} \;=\; \frac{|P|}{|G|} + \qquad (\mathit{raw} = 0 \text{ when } G = \emptyset). +\] + +\textbf{Normalization:} $R_{\mathrm{worst}} = 0.05$; +$n = \min(1, \mathit{raw} / 0.05)$. +\end{requirement} + +\begin{rationale} +The anchor says: one cross-column collision per twenty glyphs is +unmistakably broken layout --- the worst a report should be able to +distinguish. The count is divided by the glyph population, not by the pair +population, so that the measure does not vanish quadratically on large +scores: a score with one collision per page stays visible. The reference +pipeline evaluates overlap today only for \emph{declared} +\texttt{NoCollision} constraints; this axis is the full pairwise +same-system sweep over ink boxes, which is new but cheap work over data +the resolved layout already carries. +\end{rationale} + +\section{\texttt{spacing\_distortion}} +\label{sec:metrics:spacing} + +\textbf{Phenomenon.} Uneven horizontal distribution within a system: +columns bunched together here and stretched apart there, where the +underlying spring model asked for near-uniform advances. + +\begin{requirement} +\label{req:qmc:spacing} +\textbf{Contributing units:} systems $s$ with $m_s \ge 3$ (at least two +advances). + +\textbf{Raw measurement:} per unit, +$\mathit{raw}_s = \mathrm{CV}(a^s_1, \dots, a^s_{m_s - 1})$; the axis raw +value is the arithmetic mean of $\mathit{raw}_s$ over contributing units. + +\textbf{Normalization:} $R_{\mathrm{worst}} = 1.0$; +$n = \min(1, \mathit{raw})$. +\end{requirement} + +\begin{rationale} +A coefficient of variation of $1.0$ means the typical column advance +deviates from the mean by the whole mean --- spacing with no discernible +regularity. v0.1 defines \emph{geometric} regularity deliberately: the +reference spring model's preferred widths are uniform, so regular advances +are exactly what its ideal output looks like, and the collision minima +(accidental overhangs, wide columns) that legitimately perturb advances +are modest on realistic scores. +\end{rationale} + +\begin{openquestion} +\textbf{Optical spacing at the Standard tier.} Mature engraving spaces +columns proportionally to musical duration (with an optical correction), +not uniformly; under a duration-proportional model, this axis's ideal +would be ``advances proportional to the column's duration share,'' and a +perfectly optically-spaced line would score \emph{worse} than a uniform +one under the v0.1 definition. When the layout pipeline gains +duration-aware preferred widths, should the Standard tier redefine +$\mathit{raw}_s$ as deviation from the duration-proportional ideal while +Minimal keeps geometric regularity? v0.1 defines geometric regularity +only. +\end{openquestion} + +\section{\texttt{slur\_shape\_penalty}} +\label{sec:metrics:slur} + +\textbf{Phenomenon.} Badly-shaped slur arcs: flat, tape-like slurs or +bulging semicircles, measured against the shallow-arc norm of engraving +practice. + +\begin{requirement} +\label{req:qmc:slur} +\textbf{Contributing units:} drawn slur curves in $L$ with chord length +$c > 0$, where the \emph{chord} is the segment between the curve's +endpoints and the \emph{apex height} $h \ge 0$ is the maximum +perpendicular distance from the curve to its chord. + +\textbf{Raw measurement:} per unit, with arc ratio $\rho = h / c$, +\[ + \mathit{raw}_u \;=\; \max\bigl(0,\;\; 0.08 - \rho,\;\; \rho - 0.25\bigr), +\] +i.e.\ the shortfall below the ideal band $[0.08, 0.25]$ or the excess +above it; the axis raw value is the arithmetic mean over contributing +units. + +\textbf{Normalization:} $R_{\mathrm{worst}} = 0.25$; +$n = \min(1, \mathit{raw} / 0.25)$. +\end{requirement} + +\begin{rationale} +The band $[0.08, 0.25]$ brackets the shallow arcs engraving practice +prefers: an arc rising less than about $1/12$ of its span reads as a +straight line; one rising more than a quarter of its span begins to bulge. +The anchor makes a semicircular slur ($\rho = 0.5$, $\mathit{raw}_u = +0.25$) exactly worst-tolerable, and a completely flat slur ($\rho = 0$, +$\mathit{raw}_u = 0.08$) roughly a third of the way to failing. + +The v0.1 reference pipeline draws no slur geometry (slurs exist logically, +not as curves), so this axis evaluates to $0.0$ today under the +vacuous-geometry rule --- the definition is pinned now so that the first +implementation to draw slurs is measured from its first release. +\end{rationale} + +\section{\texttt{beam\_slope\_penalty}} +\label{sec:metrics:beam} + +\textbf{Phenomenon.} Over-steep beams. Engraving practice keeps beam +slants gentle regardless of the melodic interval they span. + +\begin{requirement} +\label{req:qmc:beam} +\textbf{Contributing units:} drawn beam segments in $L$ with horizontal +run $\Delta x > 0$ (endpoint-to-endpoint). + +\textbf{Raw measurement:} per unit, with absolute slope +$\sigma = |\Delta y| / \Delta x$, +\[ + \mathit{raw}_u \;=\; \max\bigl(0,\; \sigma - 0.25\bigr); +\] +the axis raw value is the arithmetic mean over contributing units. + +\textbf{Normalization:} $R_{\mathrm{worst}} = 0.25$; +$n = \min(1, \mathit{raw} / 0.25)$. +\end{requirement} + +\begin{rationale} +Slopes up to $0.25$ (about $14^\circ$) are penalty-free --- within the +range engraving manuals tolerate for short, wide-interval beams --- and the +anchor places $\sigma = 0.5$ (about $27^\circ$, roughly double any +published maximum) at worst-tolerable. Like the slur axis, this is pinned +ahead of implementation: the v0.1 reference pipeline draws no beam +geometry, so the axis evaluates to $0.0$ under the vacuous-geometry rule. +\end{rationale} + +\section{\texttt{vertical\_density\_penalty}} +\label{sec:metrics:vertical} + +\textbf{Phenomenon.} Vertical crowding or sprawl: inter-staff and +inter-system gaps realized far from the spacing the band model asked for. + +\begin{requirement} +\label{req:qmc:vertical} +\textbf{Contributing units:} vertical bands of $C$ of kind +\texttt{InterStaffGap} or \texttt{InterSystemGap} with preferred height +$p > 0$ that are realized in $L$ (the adjacent content they separate was +laid out). + +\textbf{Raw measurement:} per unit, with $r \ge 0$ the realized vertical +separation between the adjacent content extents the band separates +(measured in resolved coordinates), +\[ + \mathit{raw}_u \;=\; \frac{|r - p|}{p}; +\] +the axis raw value is the arithmetic mean over contributing units. + +\textbf{Normalization:} $R_{\mathrm{worst}} = 1.0$; +$n = \min(1, \mathit{raw})$. +\end{requirement} + +\begin{rationale} +A gap off by its own preferred size --- staves twice as far apart as asked, +or fully collapsed --- is unambiguous vertical failure; proportional +deviation makes one anchor serve both tight inter-staff gaps and wide +inter-system gaps. The v0.1 reference pipeline preserves constrained $y$ +verbatim (the vertical spring solve is deferred), so realized gaps equal +preferred gaps wherever bands are realized and the axis reports its +honest near-zero; the definition is what makes a future vertical solve +measurable. +\end{rationale} + +\section{\texttt{system\_break\_penalty}} +\label{sec:metrics:system-break} + +\textbf{Phenomenon.} Bad break choices, one system at a time: a non-final +system left loose (broken far short of the available width) or overfull +(content past the content width). + +\begin{requirement} +\label{req:qmc:system-break} +\textbf{Contributing units:} non-final systems --- for each region, every +system the casting-off produced except the region's last --- defined only +when the declared content width $W$ is finite and positive. + +\textbf{Raw measurement:} per unit, +\[ + \mathit{raw}_s \;=\; \frac{|W - w_s|}{W}, +\] +penalizing looseness ($w_s < W$) and overflow ($w_s > W$) alike; the axis +raw value is the arithmetic mean over contributing units. + +\textbf{Normalization:} $R_{\mathrm{worst}} = 0.5$; +$n = \min(1, \mathit{raw} / 0.5)$. + +A region cast onto a single system contributes no units (the break axis +degenerates to nothing-to-penalize, per +Requirement~\ref{req:qmc:vacuous}); the final system of each region is +never a unit, because a short last line is not a break failure. +\end{requirement} + +\begin{rationale} +Non-final systems half-empty on average --- or overflowing by half the +content width --- mark casting-off that has effectively failed, hence the +$0.5$ anchor. The raw quantities are exactly what the reference +casting-off pass already computes: per-system content extents against the +declared content width, with breaks chosen among barline candidates. +\end{rationale} + +\section{\texttt{page\_fill\_efficiency}} +\label{sec:metrics:page-fill} + +\textbf{Phenomenon.} Underfilled non-final pages: vertical white space a +better page-break policy would have used. Despite the field's name, the +metric follows the fixed orientation --- it measures \emph{unfilled} +fraction, so $0.0$ is best. + +\begin{requirement} +\label{req:qmc:page-fill} +\textbf{Contributing units:} non-final pages of $L$, defined only when +the declared content height $H$ is finite and positive. + +\textbf{Raw measurement:} per unit, with $\mathit{span}_p$ the vertical +extent of page $p$'s content (from the top of its first system's content +extent to the bottom of its last system's content extent) and fill +fraction $f_p = \min(1, \mathit{span}_p / H)$, +\[ + \mathit{raw}_p \;=\; 1 - f_p; +\] +the axis raw value is the arithmetic mean over contributing units. + +\textbf{Normalization:} $R_{\mathrm{worst}} = 0.75$; +$n = \min(1, \mathit{raw} / 0.75)$. + +A single-page layout contributes no units; the final page is never a +unit, because a short last page is not a fill failure. +\end{requirement} + +\begin{rationale} +A non-final page three-quarters empty is a page break with no plausible +justification --- worst-tolerable. The span-based fill fraction is +computable directly from the casting-off pass's vertical cursor walk and +per-system extents, and clamping $f_p$ at $1$ keeps slight margin +overshoot from producing a negative raw value. +\end{rationale} + +\section{\texttt{casting\_off\_quality}} +\label{sec:metrics:casting-off} + +\textbf{Phenomenon.} Uneven casting-off across a region's systems taken as +a whole: some lines full, others sparse --- including the classic failure +this axis exists to catch, a stub final system carrying one straggling +measure. Despite the field's name, $0.0$ is best. + +\begin{requirement} +\label{req:qmc:casting-off} +\textbf{Contributing units:} regions whose casting-off produced at least +two systems, each with content-extent width $w_s > 0$. + +\textbf{Raw measurement:} per unit region $R$, +\[ + \mathit{raw}_R \;=\; \mathrm{CV}\bigl(\, w_s : s \in \mathrm{systems}(R) \,\bigr), +\] +over \emph{all} of the region's systems, the final system included; the +axis raw value is the arithmetic mean over contributing units. + +\textbf{Normalization:} $R_{\mathrm{worst}} = 0.5$; +$n = \min(1, \mathit{raw} / 0.5)$. + +A single-system region contributes no units. +\end{requirement} + +\begin{rationale} +Including the final system is the deliberate difference from +\texttt{system\_break\_penalty} (which exempts it): a lone stub last line +drags the width spread up and is penalized \emph{here}, as a global +casting-off failure rather than a per-break one. The anchor: per-system +widths whose standard deviation is half their mean describe a page where +line lengths visibly disagree. +\end{rationale} + +\section{\texttt{symbol\_density\_uniformity}} +\label{sec:metrics:symbol-density} + +\textbf{Phenomenon.} Uneven crowding across systems: one line crammed with +symbols, the next sparse --- even when the lines' widths agree. Despite the +field's name, $0.0$ is best. + +\begin{requirement} +\label{req:qmc:symbol-density} +\textbf{Contributing units:} regions whose casting-off produced at least +two systems with $w_s > 0$. + +\textbf{Raw measurement:} per unit region $R$, with per-system symbol +density $\rho_s = n_s / w_s$ (glyphs per staff space of content width), +\[ + \mathit{raw}_R \;=\; \mathrm{CV}\bigl(\, \rho_s : s \in \mathrm{systems}(R),\ w_s > 0 \,\bigr); +\] +the axis raw value is the arithmetic mean over contributing units. + +\textbf{Normalization:} $R_{\mathrm{worst}} = 0.5$; +$n = \min(1, \mathit{raw} / 0.5)$. + +A single-system region contributes no units. +\end{requirement} + +\begin{rationale} +Width evenness (\texttt{casting\_off\_quality}) and density evenness are +independent failures: equal-width systems can still alternate between +sixteenth-note walls and whole-note deserts when break choices ignore +content weight. Density varying by half its mean across systems reads as +visibly uneven engraving, hence the shared $0.5$ anchor. +\end{rationale} + +% =========================================================================== +\chapter{Default Tie-Breaking Weights} +\label{ch:weights} + +The core specification requires normative default +\texttt{TieBreakingWeights}: they select among Pareto-equivalent layouts, +deterministically, and are ``the basis for reference-suite conformance.'' + +\begin{requirement} +\label{req:qmc:weights} +The normative default tie-breaking weights are $1.0$ for every one of the +nine fields of \texttt{TieBreakingWeights}: + +\begin{center} +\small +\begin{tabular}{lc@{\hspace{2.5em}}lc} +\toprule +\textbf{Weight} & \textbf{Default} & \textbf{Weight} & \textbf{Default} \\ +\midrule +\texttt{collision} & \tablenums{1.0} & \texttt{system\_break} & \tablenums{1.0} \\ +\texttt{spacing} & \tablenums{1.0} & \texttt{page\_fill} & \tablenums{1.0} \\ +\texttt{slur\_shape} & \tablenums{1.0} & \texttt{casting\_off} & \tablenums{1.0} \\ +\texttt{beam\_slope} & \tablenums{1.0} & \texttt{symbol\_density} & \tablenums{1.0} \\ +\texttt{vertical\_density} & \tablenums{1.0} & & \\ +\bottomrule +\end{tabular} +\end{center} + +Implementations \MAY{} let users customize weights, per the core +specification; conformance evaluation on the reference suite uses these +defaults. +\end{requirement} + +\begin{rationale} +No aesthetic priority ordering among the nine axes has been ratified, and +inventing one ahead of measurement experience would encode a preference no +evidence supports. Uniform weights are the honest neutral default --- they +make tie-breaking deterministic (the core's actual requirement) without +pretending to a house style. They also bless the reference +implementation's existing \texttt{Default} for \texttt{TieBreakingWeights} +(every field $1.0$). Revisions of this catalog are expected to tune the +defaults once reference-suite experience shows which axes dominate +perceived quality. +\end{rationale} + +% =========================================================================== +\chapter{Per-Tier Metric Thresholds} +\label{ch:thresholds} + +\section{The Default Threshold Table} +\label{sec:thresholds:table} + +A tier's threshold for an axis is the maximum permitted +\texttt{NormalizedMetric} value on a reference-suite entry evaluated at +that tier. The core specification fixes the relationship: Minimal-tier +thresholds are relaxed relative to Standard; the Standard tier corresponds +to professional engraving quality. + +\begin{table}[h] +\centering +\small +\begin{tabular}{lcc} +\toprule +\textbf{Axis} & \textbf{Minimal (max)} & \textbf{Standard (max)} \\ +\midrule +\texttt{collision\_penalty} & \tablenums{0.90} & \tablenums{0.25} \\ +\texttt{spacing\_distortion} & \tablenums{0.90} & \tablenums{0.40} \\ +\texttt{slur\_shape\_penalty} & \tablenums{0.90} & \tablenums{0.30} \\ +\texttt{beam\_slope\_penalty} & \tablenums{0.90} & \tablenums{0.30} \\ +\texttt{vertical\_density\_penalty} & \tablenums{0.90} & \tablenums{0.40} \\ +\texttt{system\_break\_penalty} & \tablenums{0.90} & \tablenums{0.35} \\ +\texttt{page\_fill\_efficiency} & \tablenums{0.90} & \tablenums{0.40} \\ +\texttt{casting\_off\_quality} & \tablenums{0.90} & \tablenums{0.35} \\ +\texttt{symbol\_density\_uniformity} & \tablenums{0.90} & \tablenums{0.40} \\ +\bottomrule +\end{tabular} +\caption{Default per-tier maximum \texttt{NormalizedMetric} values. +Minimal is uniformly more permissive than Standard on every axis.} +\label{tab:tier-thresholds} +\end{table} + +\begin{requirement} +\label{req:qmc:thresholds} +The default per-tier thresholds are given by +Table~\ref{tab:tier-thresholds}. A solver claiming a tier \MUST{} keep +every normative metric at or below the tier's threshold on every +reference-suite entry required at that tier, per the core specification's +suite-conformance conditions. The Reference Suite companion \MAY{} +override these defaults for individual entries; absent an override, the +values of Table~\ref{tab:tier-thresholds} govern. +\end{requirement} + +\begin{rationale} +\textbf{Minimal = 0.90 everywhere: relaxed but non-vacuous.} A Minimal +solver may be aesthetically mediocre --- the core says so --- but it must +not be \emph{pathological}, and its metric vectors must be accurate. A +uniform $0.90$ admits every honestly-mediocre layout while excluding two +things: layouts at an axis's worst-tolerable anchor, and the all-worst +placeholder vector of a solver that computes nothing. That second +exclusion is deliberate --- a solver reporting the unmeasured $1.0$ +placeholder cannot pass the Minimal suite, which is exactly the +honest-tier discipline: measuring is part of the Minimal claim. + +\textbf{Standard = 0.25--0.40 per axis: professional quality.} Collisions +get the tightest bound ($0.25$: at most one cross-column collision per +eighty glyphs) because they are the most jarring single defect. The +break-family axes ($0.35$) sit slightly tighter than the distribution and +vertical axes ($0.40$), whose v0.1 definitions are coarser proxies +(geometric spacing regularity; a not-yet-solved vertical dimension). Slurs +and beams ($0.30$) allow modest shape deviation across a piece. All values +are round v0.1 defaults chosen to be defensible, not optimal; the tuning +open question below owns their evolution. +\end{rationale} + +\section{The Advanced Tier} +\label{sec:thresholds:advanced} + +\begin{requirement} +\label{req:qmc:advanced} +The Advanced tier imposes the Standard-tier thresholds of +Table~\ref{tab:tier-thresholds} on the nine normative axes, \emph{plus} +per-extension thresholds on extension metrics: a registered extension +whose layout requirements are part of the Advanced reference suite +\MUST{} declare, in its extension declaration, a maximum +\texttt{NormalizedMetric} value for each extension metric it contributes, +and an Advanced-tier solver \MUST{} meet each declared threshold on every +Advanced suite entry that exercises that extension. An extension metric +with no declared threshold imposes no Advanced-tier obligation. +\end{requirement} + +\section{The \texttt{QualityFloorApproached} Warning} +\label{sec:thresholds:floor} + +The core specification gives \texttt{SolverWarningKind} a +\texttt{QualityFloorApproached} variant carrying a +\texttt{QualityMetricKind} payload, without defining its trigger. This +catalog pins it. + +\begin{requirement} +\label{req:qmc:floor-warning} +A solver \SHOULD{} emit a \texttt{QualityFloorApproached} warning for +metric kind $k$ when the computed value of $k$'s axis exceeds +$\mathbf{0.8}$ times the applicable threshold for that axis. The +applicable threshold is the one selected by the solve's +\texttt{SolverProfile} (Chapter~\ref{ch:profiles}); +the warning fraction is pinned at $0.8$ exactly. The warning is +diagnostic: emitting it does not change the solve's status, and a value +\emph{over} the threshold still warns (it exceeds $0.8$ of it a +fortiori) --- threshold \emph{enforcement} exists only in reference-suite +evaluation, not in ordinary solves. +\end{requirement} + +\section{Standard-Tier Constraint Families} +\label{sec:thresholds:families} + +The core specification's Standard-tier requirement obliges a Standard +solver to ``support every Standard-tier constraint family declared in the +Quality Metric Catalog.'' This section is that declaration. + +\begin{requirement} +\label{req:qmc:standard-families} +The Standard-tier constraint families are the core specification's +built-in layout-constraint surface (Chapter~7, +\sectionsc{ConstrainedLayoutIR}): + +\begin{itemize} + \item the \textbf{spring families}: horizontal spring slots and vertical + bands, with their min/preferred/max and stretch/compress parameters; + \item the five built-in \texttt{LayoutConstraint} kinds: + \texttt{NoCollision}, \texttt{Align}, \texttt{PositionWithin}, + \texttt{SystemBreakAt}, and \texttt{PageBreakAt} (both + \texttt{Hard} and \texttt{Soft} break kinds). +\end{itemize} + +These same families constitute ``the standard constraint families'' of +the core's Minimal-tier requirement: Minimal and Standard support the +same family set and differ in metric thresholds and incremental-solving +obligations, not in constraint vocabulary. +\texttt{LayoutConstraint::Registered} (extension-contributed) families +are per-extension obligations of the Advanced tier only. +\end{requirement} + +\begin{openquestion} +\textbf{Threshold tuning.} Every number in +Table~\ref{tab:tier-thresholds} and every anchor constant in +Chapter~\ref{ch:metrics} is a v0.1 default pinned ahead of measurement +experience: no implementation has yet reported real vectors across the +reference suite. Once the reference implementation computes real metrics +on the v0.1 entry set, are the Standard columns achievable-but-meaningful +(neither trivially passed nor unreachable), and do any anchors need +rescaling? Threshold and anchor revisions are \textsc{minor} versions of +this catalog and are expected. +\end{openquestion} + +% =========================================================================== +\chapter{The Registered Profile Catalog} +\label{ch:profiles} + +The core specification's vocabulary appendix defines +\texttt{SolverProfile} as a registered profile identifier that ``selects +the solver's hard-constraint set, normalized-metric thresholds, +tie-breaking weights, and active extension catalog,'' and defers the +registry to this companion. + +\begin{requirement} +\label{req:qmc:profiles} +The registered \texttt{SolverProfile} catalog is exactly three profiles: +\texttt{Draft}, \texttt{Standard}, and \texttt{Publication}. Their +selections: + +\begin{center} +\small +\begin{tabular}{lllll} +\toprule +\textbf{Profile} & \textbf{Constraint families} & \textbf{Threshold column} & +\textbf{Weights} & \textbf{Extensions} \\ +\midrule +\texttt{Draft} & Standard-tier set & Minimal + & defaults & none required \\ +\texttt{Standard} & Standard-tier set & Standard + & defaults & none required \\ +\texttt{Publication} & Standard-tier set & Standard + & defaults & none required \\ +\bottomrule +\end{tabular} +\end{center} + +\begin{itemize} + \item \emph{Constraint families}: all three profiles activate the + Standard-tier constraint families of + Requirement~\ref{req:qmc:standard-families}; hard constraints are + never traded away by any profile (the core's + hard-constraints-are-inviolable rule). + \item \emph{Threshold column}: the column of + Table~\ref{tab:tier-thresholds} the profile selects --- the thresholds + against which Requirement~\ref{req:qmc:floor-warning}'s warning + fraction is evaluated during ordinary solves. \texttt{Draft} selects + the Minimal column (few warnings, fast iteration); + \texttt{Standard} and \texttt{Publication} select the Standard + column. In v0.1 no column tighter than Standard is ratified; + \texttt{Publication} is registered now so that documents and + configurations can name it, and a future revision \MAY{} give it a + tighter column without a schema change. + \item \emph{Weights}: all three profiles use the default tie-breaking + weights of Requirement~\ref{req:qmc:weights}. + \item \emph{Extensions}: no profile requires an active extension + catalog; extensions activate by document declaration, not by + profile. +\end{itemize} + +\texttt{Standard} is the default profile. +\end{requirement} + +\begin{rationale} +\textbf{Profiles are configuration; tiers are claims.} A +\texttt{SolverProfile} is a runtime input (\texttt{SolverConfig.profile}) +that any solver may be asked to run under; a conformance tier is a claim +about the solver evaluated on the reference suite. The two meet in +exactly one place: the profile's threshold column determines which +thresholds the solver's own \texttt{QualityFloorApproached} diagnostics +reference during ordinary solves. Suite evaluation at a claimed tier +always uses that \emph{tier's} column, whatever profile the solver runs +under day to day. The three-profile registry matches the reference +implementation's existing \texttt{SolverProfile} enum +(\texttt{Draft} / \texttt{Standard} / \texttt{Publication}, default +\texttt{Standard}) so that registration blesses shipped reality rather +than inventing a parallel one. +\end{rationale} + +% =========================================================================== +\chapter{Revision History} +\label{ch:history} + +\begin{longtable}{p{2cm} p{2.5cm} p{9cm}} + \toprule + \textbf{Date} & \textbf{Section} & \textbf{Change} \\ + \midrule + \endhead + \today & All & 0.1.0 --- Initial companion: pins the diagnostic-only + status of quality metrics, within-implementation determinism without + cross-implementation numeric agreement, the \texttt{QualityMetricKind} + enumeration, the measurement domain, and the vacuous-geometry rule; + defines all nine normative axes (phenomenon, raw measurement over + resolved geometry, clamped-linear normalization with pinned anchors); + sets the default tie-breaking weights (all $1.0$); establishes the + Minimal/Standard threshold table, the Advanced extension rule, the + \texttt{QualityFloorApproached} trigger ($0.8\times$ threshold), and + the Standard-tier constraint family declaration; registers the + \texttt{Draft}/\texttt{Standard}/\texttt{Publication} profile catalog. + Open questions: the notated-but-unrendered honesty edge, optical + spacing at the Standard tier, threshold tuning pending reference-suite + experience. \\ +\bottomrule +\end{longtable} + +\end{document} diff --git a/spec/reference_suite.pdf b/spec/reference_suite.pdf new file mode 100644 index 0000000..4cac66a Binary files /dev/null and b/spec/reference_suite.pdf differ diff --git a/spec/reference_suite.tex b/spec/reference_suite.tex new file mode 100644 index 0000000..26e0964 --- /dev/null +++ b/spec/reference_suite.tex @@ -0,0 +1,756 @@ +% !TEX program = xelatex +% +% Epiphany --- Reference Suite (companion specification) +% Companion to the Core Specification. Compile with XeLaTeX. +% +% This document is versioned independently of the Core Specification +% (independent semver; see the Versioning note in the front matter). Its preamble +% is intentionally a self-contained copy of the core specification's preamble so +% the two documents build independently; factoring a shared preamble file is a +% later cleanup, not a v0.1 deliverable. + +\documentclass[11pt,letterpaper]{report} + +% --------------------------------------------------------------------------- +% Packages +% --------------------------------------------------------------------------- +\usepackage{fontspec} +\usepackage{geometry} +\geometry{ + letterpaper, + top=1.05in, + bottom=1.05in, + left=1.15in, + right=1.15in, + headheight=15pt +} + +\usepackage[english]{babel} +\usepackage{microtype} +\usepackage{parskip} +\usepackage{xcolor} +\usepackage{hyperref} +\usepackage{enumitem} +\usepackage{titlesec} +\usepackage{fancyhdr} +\usepackage{booktabs} +\usepackage{array} +\usepackage{longtable} +\usepackage{listings} +\usepackage{amsmath} +\usepackage{amssymb} +\usepackage{tcolorbox} +\tcbuselibrary{breakable, skins} + +% --------------------------------------------------------------------------- +% Color palette (shared with the core specification) +% --------------------------------------------------------------------------- +\definecolor{epiphanyteal}{HTML}{1A4044} +\definecolor{epiphanygold}{HTML}{8E6E2E} +\definecolor{epiphanyink}{HTML}{1F1B16} +\definecolor{epiphanyslate}{HTML}{6B6660} +\definecolor{epiphanycream}{HTML}{F8F4ED} +\definecolor{epiphanymist}{HTML}{ECE8E0} +\definecolor{epiphanycode}{HTML}{2A2520} +\definecolor{epiphanycrimson}{HTML}{7A2424} + +\hypersetup{ + colorlinks=true, + linkcolor=epiphanyteal, + citecolor=epiphanyteal, + urlcolor=epiphanygold, + pdftitle={Epiphany --- Reference Suite}, + pdfauthor={The Epiphany Project}, + pdfsubject={Reference Suite companion for the Epiphany music notation platform}, + pdfkeywords={music notation, engraving, reference suite, conformance, solver tiers, test scores}, + bookmarksnumbered=true, + bookmarksopen=true +} + +% --------------------------------------------------------------------------- +% Typography (shared with the core specification) +% --------------------------------------------------------------------------- +\setmainfont{TeX Gyre Pagella}[Numbers={OldStyle, Proportional}, Ligatures={TeX, Common}] +\setsansfont{TeX Gyre Heros}[Scale=0.94, Ligatures={TeX, Common}] +\setmonofont{TeX Gyre Cursor}[Scale=0.88, Ligatures={TeX}] +\newfontfamily\titlefont{TeX Gyre Pagella}[Numbers={OldStyle}, Ligatures={TeX, Common}] +\newcommand{\tablenums}[1]{{\addfontfeatures{Numbers={Lining,Tabular}}#1}} +\newcommand{\sectionsc}[1]{{\addfontfeatures{Letters=SmallCaps}#1}} + +% --------------------------------------------------------------------------- +% Section styling (shared with the core specification) +% --------------------------------------------------------------------------- +\titleformat{\chapter}[display] + {\normalfont\filright} + {\raggedright\color{epiphanygold}\fontsize{14pt}{16pt}\selectfont 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+\fancyhead[R]{\small\itshape\color{epiphanyslate}\leftmark} +\fancyfoot[C]{\small\color{epiphanyslate}\thepage} +\renewcommand{\headrule}{ + \color{epiphanygold!50}\hrule width\headwidth height 0.4pt + \vspace{1pt} + \color{epiphanygold!30}\hrule width\headwidth height 0.2pt +} + +% --------------------------------------------------------------------------- +% Code listing style (shared with the core specification) +% --------------------------------------------------------------------------- +\lstdefinelanguage{Rust}{ + keywords={fn,let,mut,pub,struct,enum,impl,trait,for,in,if,else,match,return, + use,mod,crate,self,Self,as,where,move,async,await,const,static, + ref,type,unsafe,extern,dyn,box,break,continue,loop,while}, + keywordstyle=\color{epiphanyteal}\bfseries, + ndkeywords={i8,i16,i32,i64,i128,u8,u16,u32,u64,u128,f32,f64,bool,char,str, + String,Vec,Option,Result,Box,Rc,Arc,HashMap,BTreeMap, + NonZeroU16,NonZeroU32,NonZeroU64,Duration,Timestamp}, + ndkeywordstyle=\color{epiphanygold}\bfseries, + sensitive=true, + comment=[l]{//}, + morecomment=[s]{/*}{*/}, + commentstyle=\color{epiphanyslate}\itshape, + stringstyle=\color{epiphanycrimson}, + morestring=[b]", + morestring=[b]' +} +\lstset{ + basicstyle=\ttfamily\small\color{epiphanycode}, + backgroundcolor=\color{epiphanycream}, + frame=leftline, + rulecolor=\color{epiphanygold!60}, + framesep=8pt, + framerule=1.5pt, + xleftmargin=10pt, + xrightmargin=4pt, + breaklines=true, + showstringspaces=false, + numberstyle=\tiny\color{epiphanyslate}, + numbersep=10pt, + captionpos=b, + aboveskip=10pt, + belowskip=10pt, + language=Rust +} + +% --------------------------------------------------------------------------- +% Custom environments (shared with the core specification) +% --------------------------------------------------------------------------- +\newtcolorbox{openquestion}[1][]{ + enhanced, breakable, + colback=epiphanymist, colframe=epiphanycrimson, + fonttitle=\bfseries\color{white}, title={\scshape\hspace{2pt}Open Question}, + coltitle=white, colbacktitle=epiphanycrimson, + arc=1pt, boxrule=0pt, leftrule=2pt, + left=10pt, right=10pt, top=8pt, bottom=8pt, + attach boxed title to top left={xshift=0pt, yshift=0pt}, + boxed title style={arc=0pt, sharp corners, boxrule=0pt, left=6pt, right=8pt, top=2pt, bottom=2pt}, + #1 +} +\newtcolorbox{rationale}[1][]{ + enhanced, breakable, + colback=epiphanymist, colframe=epiphanyteal, + fonttitle=\bfseries\color{white}, title={\scshape\hspace{2pt}Rationale}, + coltitle=white, colbacktitle=epiphanyteal, + arc=1pt, boxrule=0pt, leftrule=2pt, + left=10pt, right=10pt, top=8pt, bottom=8pt, + attach boxed title to top left={xshift=0pt, yshift=0pt}, + boxed title style={arc=0pt, sharp corners, boxrule=0pt, left=6pt, right=8pt, top=2pt, bottom=2pt}, + #1 +} +\newtcolorbox{requirement}[1][]{ + enhanced, breakable, + colback=white, colframe=epiphanygold, + fonttitle=\bfseries\color{white}, title={\scshape\hspace{2pt}Requirement}, + coltitle=white, colbacktitle=epiphanygold, + arc=1pt, boxrule=0pt, leftrule=2pt, + left=10pt, right=10pt, top=8pt, bottom=8pt, + attach boxed title to top left={xshift=0pt, yshift=0pt}, + boxed title style={arc=0pt, sharp corners, boxrule=0pt, left=6pt, right=8pt, top=2pt, bottom=2pt}, + #1 +} +\newtcolorbox{nongoal}[1][]{ + enhanced, breakable, + colback=epiphanymist, colframe=epiphanyslate, + fonttitle=\bfseries\color{white}, title={\scshape\hspace{2pt}Non-Goal}, + coltitle=white, colbacktitle=epiphanyslate, + arc=1pt, boxrule=0pt, leftrule=2pt, + left=10pt, right=10pt, top=8pt, bottom=8pt, + attach boxed title to top left={xshift=0pt, yshift=0pt}, + boxed title style={arc=0pt, sharp corners, boxrule=0pt, left=6pt, right=8pt, top=2pt, bottom=2pt}, + #1 +} + +\newcommand{\MUST}{\textbf{MUST}} +\newcommand{\MUSTNOT}{\textbf{MUST}\nobreak\ \textbf{NOT}} +\newcommand{\SHOULD}{\textbf{SHOULD}} +\newcommand{\SHOULDNOT}{\textbf{SHOULD}\nobreak\ \textbf{NOT}} +\newcommand{\MAY}{\textbf{MAY}} + +\setlist[itemize]{topsep=2pt, itemsep=3pt, parsep=0pt} +\setlist[enumerate]{topsep=2pt, itemsep=3pt, parsep=0pt} +\setlist[description]{topsep=2pt, itemsep=5pt, parsep=0pt} +\AtBeginDocument{\color{epiphanyink}} + +% --------------------------------------------------------------------------- +% Document +% --------------------------------------------------------------------------- +\begin{document} + +\begin{titlepage} + \thispagestyle{empty} + \centering + \vspace*{2.2in} + {\color{epiphanygold}\rule{3in}{0.8pt}}\\[18pt] + {\titlefont\fontsize{34pt}{38pt}\selectfont\color{epiphanyteal}\bfseries Epiphany}\\[10pt] + {\Large\scshape\color{epiphanyslate}Reference Suite}\\[6pt] + {\large\itshape\color{epiphanyslate}A companion to the Core Specification}\\[14pt] + {\color{epiphanygold}\rule{3in}{0.8pt}}\\[24pt] + {\normalsize\color{epiphanyink}Version 0.1.0 --- Phase 3 (the initial entry set: six scores, required at Minimal, declared for Standard)}\\[4pt] + {\small\color{epiphanyslate}Normative for solver conformance claims} + \vfill +\end{titlepage} + +\tableofcontents + +% =========================================================================== +\chapter{About This Companion} +\label{ch:about} + +The \emph{Reference Suite} is a companion to the Epiphany Core +Specification. It fulfils the core specification's delegation in its +\sectionsc{Companion Specifications} appendix (the +\texttt{sec:deferred:companions} section), which charters this document as +``the collection of test scores against which solver conformance is +established, with per-tier inclusion, per-tier metric thresholds, and any +fixed-expectation tests. Versioned with this specification.'' + +This release (v0.1.0) delivers: + +\begin{itemize} + \item the \textbf{suite entry model} --- how entries name their test + scores, how each solve is configured, what passing an entry and + passing the suite mean, and how fixed-expectation tests work + (Chapter~\ref{ch:model}); + \item the \textbf{v0.1 entry set}: six scores, every one required for + Minimal-tier conformance and the same six constituting the + Standard-tier subset (Chapter~\ref{ch:entries}); + \item a non-normative note on the reference implementation's suite + harness (Chapter~\ref{ch:harness}). +\end{itemize} + +This document does \emph{not} cover: + +\begin{itemize} + \item the definition, normalization, and default thresholds of the + quality metrics --- those are the \emph{Quality Metric Catalog} + companion's, and this document consumes them; + \item performance conformance (edit traces, frame budgets) --- the + \emph{Performance Reference Suite} companion's, per the core + specification's explicit boundary; + \item the reference solving algorithm --- the non-normative + \emph{Reference Algorithm} companion's. +\end{itemize} + +\section{Relationship to the Core Specification} +\label{sec:about:relationship} + +The suite's charter is the core specification's Chapter~9 +(\sectionsc{The Constraint Solver Interface}, the \texttt{ch:solver} +chapter), \sectionsc{Conformance: The Reference Suite} section +(\texttt{sec:solver:conformance}). That section's suite-entry requirement +fixes what every entry consists of --- a test score in canonical +\texttt{.musc} form; per-tier inclusion; per-tier metric thresholds; and +optional fixed-expectation tests, used sparingly --- and fixes the pass +rule: ``A solver claiming a given tier \MUST{} pass every entry required +at that tier. Failure on any single entry is conformance failure at the +claimed tier.'' + +Three more core anchors bind this document: + +\begin{itemize} + \item The \sectionsc{Cross-Implementation Conformance} requirement (in + the core's solver-determinism section) enumerates the four conditions + a conforming solver meets across the suite; this document's + per-entry evaluation rule (Section~\ref{sec:model:pass}) is those + conditions applied entry-by-entry. + \item The \sectionsc{Reference Algorithm} section makes + fixed-expectation tests the \emph{only} place the suite may force a + particular layout; everywhere else, any algorithm within thresholds + conforms. Section~\ref{sec:model:fixed} inherits that discipline. + \item The \emph{Quality Metric Catalog} companion defines every metric, + its normalization, and the default per-tier thresholds this suite's + entries reference. This document never restates a threshold; it + names the catalog's defaults and records per-entry overrides (v0.1: + none). +\end{itemize} + +Where this document and a ratified core requirement disagree, \textbf{the +core requirement governs} and the discrepancy is a defect in this +document. One deliberate v0.1 deviation from the charter's letter --- +naming scores by deterministic builder rather than shipping +\texttt{.musc} bundles --- is called out as such, with its open question, +in Section~\ref{sec:model:referencing}. + +\section{Conformance} +\label{sec:about:conformance} + +The entry set, entry construction rules, solve configurations, and tier +inclusions in this document are \textbf{normative}. A solver conformance +claim at a tier is a claim about \emph{this} suite at \emph{this} +version: + +\begin{itemize} + \item claiming tier $T$ means passing every entry + (Section~\ref{sec:model:pass}) that Chapter~\ref{ch:entries} requires + at tier $T$ --- failure on any single entry is conformance failure at + the claimed tier; + \item per the core specification, suite versions are tied to + specification versions, and a conforming implementation \MUST{} + declare which suite version it passes + (Section~\ref{sec:model:versioning}). +\end{itemize} + +% =========================================================================== +\chapter{The Suite Entry Model} +\label{ch:model} + +\section{Score Referencing} +\label{sec:model:referencing} + +\begin{requirement} +\label{req:refsuite:referencing} +A v0.1 suite entry names its test score by \textbf{reference-implementation +builder and seed}: a deterministic constructor exported by the reference +implementation's test kit (the \texttt{epiphany-testkit} crate), together +with any seed argument, reproduces the score graph bit-for-bit. Two +referencing forms are used: + +\begin{itemize} + \item a \textbf{seeded builder}: a public function taking a \texttt{u64} + seed (e.g.\ \texttt{fixtures::ten\_measure\_single\_staff}, or a + generator re-exported through the test kit), with the entry pinning + the exact seed value; + \item a \textbf{corpus name}: the \texttt{name} string of an entry of + the test kit's tagged corpus (\texttt{corpus()}), whose builder takes + no arguments and is deterministic by construction. +\end{itemize} + +The constructed score graph --- not any serialized artifact of it --- is +the entry's test score. Implementations under test \MUST{} evaluate the +entry against a score graph identical to the one the named builder +produces with the named seed. +\end{requirement} + +\begin{rationale} +The core charter describes each entry as ``a test score in canonical +\texttt{.musc} form.'' v0.1 deliberately references builders instead of +shipping bundles, because today \emph{the builders are the canonical +definition}: they are versioned, reviewed, deterministic (seeded +\texttt{SplitMix64} identity minting), asserted invariant-clean, and +reproducible bit-for-bit by anyone building the reference crates --- while +the \texttt{.musc} byte format is still absorbing schema-major evolution, +so a shipped bundle would rot faster than the builder that made it. A +corpus caution: the test kit tags corpus fixtures with an +\emph{eligibility-taxonomy} tier (\texttt{Common} / \texttt{Edge} / +\texttt{Torture}); that taxonomy is unrelated to solver conformance tiers +(Minimal / Standard / Advanced) and carries no normative weight in this +suite. +\end{rationale} + +\begin{openquestion} +\textbf{Builder references versus shipped \texttt{.musc} bundles.} The +charter's letter --- entries in canonical \texttt{.musc} form --- is not met +by v0.1: builder-plus-seed is implementation-anchored, which makes the +suite awkward for an independent implementation that does not link the +reference test kit (it must re-derive the score graphs from the builders' +sources). A future revision \MAY{} ship canonical \texttt{.musc} bundles +for every entry, exactly as the charter describes, once schema-major +bytes are stable enough that shipped bundles do not rot; at that point +builder references would remain as the bundles' provenance record. Until +then, the deviation is deliberate and this open question owns it. +\end{openquestion} + +\section{Solve Configuration} +\label{sec:model:solve-config} + +A suite entry is only reproducible if the solve it prescribes is fully +specified: the same score under a different page geometry casts off into +different systems, and several metric axes are defined over the declared +content bounds. + +\begin{requirement} +\label{req:refsuite:solve-config} +Each suite entry declares the full solve configuration it is evaluated +under: + +\begin{itemize} + \item the \textbf{page geometry}: page size and margins, in staff + spaces. In v0.1 every entry uses the reference implementation's + documented default --- A4 portrait at an 8\,mm staff height: page + $105 \times 148.5$ staff spaces, margins $7.5$ staff spaces on all + four sides, hence a content area of $90 \times 133.5$ staff spaces. + (The score graph has no home for page geometry yet: the core names + \texttt{Canvas.layout\_defaults} without defining a type, tracked as + Pass-12 row P12-I7, so geometry is declared per entry as a solver + parameter.) + \item the \textbf{solver configuration}: the \texttt{SolverConfig} + fields. In v0.1 every entry uses the default configuration --- the + \texttt{Standard} profile, an unbounded deterministic budget, and + the Quality Metric Catalog's default tie-breaking weights. +\end{itemize} + +An implementation \MUSTNOT{} substitute its own defaults for a declared +configuration when evaluating an entry. +\end{requirement} + +\section{Passing an Entry, Passing the Suite} +\label{sec:model:pass} + +\begin{requirement} +\label{req:refsuite:pass} +A solver \textbf{passes an entry at tier $T$} when, solving the entry's +score under the entry's declared configuration, all four of the core +specification's cross-implementation conformance conditions hold for that +solve: + +\begin{enumerate} + \item every hard constraint of the solve is satisfied; + \item the result is internally deterministic per the core's + within-implementation rule (byte-identical + \texttt{ResolvedLayoutIR} for repeated identical solves within one + implementation version); + \item the \texttt{SolveReport} is well-formed and diagnostically + accurate --- in particular the metric vector is computed per the + Quality Metric Catalog, never a placeholder; + \item every normative quality metric is at or below tier $T$'s + threshold for its axis --- the Quality Metric Catalog's default + per-tier threshold table, unless the entry declares a per-entry + override (no v0.1 entry does); +\end{enumerate} + +and additionally every fixed-expectation test the entry declares is +reproduced exactly (no v0.1 entry declares any). + +A solver \textbf{passes the suite at tier $T$} when it passes every entry +required at tier $T$. Per the core specification, failure on any single +entry is conformance failure at the claimed tier; a status of +\texttt{Unsatisfiable} or a budget-exhausted partial solve on a suite +entry is a failure of condition~(1) or~(3), not an exemption. +\end{requirement} + +\section{Fixed-Expectation Tests} +\label{sec:model:fixed} + +The core specification permits an entry to pin specific layout properties +--- a particular bar's width, a specific system-break location --- that all +conforming solvers must reproduce, and directs that they be used +sparingly. In the resolved layout such expectations are checkable against +concrete structures: a bar's width against its \texttt{ResolvedMeasure} +bounding box, a system count or break location against the +\texttt{ResolvedSystem} list and the slots at which systems begin. + +\begin{requirement} +\label{req:refsuite:fixed-expectations} +v0.1 declares \textbf{no fixed-expectation tests}. The mechanism is +deliberately unused: every v0.1 entry is evaluated by validity, +determinism, report accuracy, and thresholds alone. An entry of a future +suite revision that adds a fixed expectation \MUST{} state the expected +value, the resolved structure it is checked against, and the exact +comparison (including any tolerance). +\end{requirement} + +\begin{rationale} +A fixed expectation binds \emph{every conforming solver} to one layout +fact forever after; it is the only place the suite may force a layout, +and none is warranted yet --- no cross-implementation ambiguity has +surfaced that thresholds fail to resolve. The reference implementation's +golden files (SVG snapshots, byte-anchored layouts) are +\emph{implementation regression locks}: they pin what \emph{that} +implementation produced so its own drift is caught, and they are +deliberately not suite conformance --- promoting them to fixed +expectations would freeze the ecosystem to the reference algorithm's +choices, exactly what the core's threshold-based conformance model +exists to avoid. +\end{rationale} + +\section{Suite Versioning} +\label{sec:model:versioning} + +\begin{requirement} +\label{req:refsuite:versioning} +Per the core specification, suite versions are tied to specification +versions: each release of this companion names the core-specification +version whose conformance story it serves, and a revision of the core's +solver chapter that changes tier obligations requires a corresponding +suite revision. This v0.1.0 suite serves the pre-1.0 core working draft. +A conforming implementation \MUST{} declare which suite version it +passes; a claim without a suite version is not a conformance claim. +\end{requirement} + +This document keeps its own revision history (Chapter~\ref{ch:history}), +independent of the Quality Metric Catalog's: entry-set growth and +threshold-override changes are suite revisions, while metric definitions +and default thresholds revise in the catalog. + +% =========================================================================== +\chapter{The v0.1 Entry Set} +\label{ch:entries} + +\section{Overview} +\label{sec:entries:overview} + +\begin{requirement} +\label{req:refsuite:entries} +The v0.1 entry set is exactly the six entries of +Table~\ref{tab:entries}. Every entry is \textbf{required at the Minimal +tier}. The \textbf{Standard-tier subset is the same six entries}, +evaluated against the Quality Metric Catalog's Standard threshold +column. No entry declares a per-entry threshold override; no entry +declares a fixed-expectation test. No entry is designated +Advanced-only in v0.1 (the Advanced tier adds obligations, not +entries, until an extension's layout requirements enter the suite). +\end{requirement} + +\begin{table}[h] +\centering +\small +\begin{tabular}{lp{4.2cm}p{6.6cm}} +\toprule +\textbf{Id} & \textbf{Entry} & \textbf{Construction} \\ +\midrule +RS-1 & Ten-measure single staff & + \texttt{fixtures::ten\_measure\_single\_staff} with seed + \texttt{0x000A\_11CE} \\ +RS-2 & Rich multi-region score & + \texttt{generators::valid\_score\_rich} with seed \texttt{0xF302} + (= corpus entry \texttt{gen\_valid\_score\_rich}) \\ +RS-3 & B-flat major scale & + corpus entry \texttt{b\_flat\_major\_scale} \\ +RS-4 & Two-voice counterpoint & + corpus entry \texttt{two\_voice\_counterpoint} \\ +RS-5 & Notes and rests & + corpus entry \texttt{notes\_and\_rests} \\ +RS-6 & Three-four meter line & + corpus entry \texttt{meter\_three\_four} \\ +\bottomrule +\end{tabular} +\caption{The v0.1 entry set. All six entries are required at Minimal; +the same six constitute the Standard subset. Solve configuration for +every entry: the declared default geometry and solver configuration of +Requirement~\ref{req:refsuite:solve-config}.} +\label{tab:entries} +\end{table} + +No implementation claims Standard-tier conformance as of this suite +version; the Standard listing exists so that the first Standard claim is +made against a pre-declared bar rather than a bar negotiated after the +fact. Where an entry's layout lacks a metric's geometry class (a single +system, a single page, no drawn slurs or beams), the affected axes +evaluate to $0.0$ under the catalog's vacuous-geometry rule and the +entry's threshold on those axes is trivially met; each entry's coverage +note below says which axes it exercises non-degenerately. + +\section{RS-1: Ten-Measure Single Staff} +\label{sec:entries:rs1} + +\begin{description} + \item[Construction.] + \texttt{epiphany\_testkit::fixtures::ten\_measure\_single\_staff(0x000A\_11CE)} + --- the seed the reference implementation's engraving and rendering + acceptance goldens document. + \item[Content.] A 10-measure, single-staff, single-voice metric score: + 40 quarter notes (four per measure, all C4), plus a tie, a spanner, a + marker, and a chord symbol. Invariant-clean by construction. + \item[Coverage.] The multi-system workhorse. Under the declared + geometry the spaced line (about 99 staff spaces) exceeds the content + width of 90 staff spaces and casts off into \textbf{two systems}, + chosen among the barline break candidates --- so the + \texttt{SystemBreak}, \texttt{CastingOff}, and + \texttt{SymbolDensity} axes are exercised non-degenerately, + alongside \texttt{Collision} and \texttt{Spacing} (axis names per + the catalog's \texttt{QualityMetricKind} mapping). The + cross-cutting objects (tie, spanner, marker, chord symbol) ride + through the projection. Single page: the \texttt{PageFill} axis + degenerates. + \item[Tiers, thresholds, expectations.] Required at Minimal; in the + Standard subset. Catalog default thresholds; no overrides; no fixed + expectations. +\end{description} + +\section{RS-2: Rich Multi-Region Score} +\label{sec:entries:rs2} + +\begin{description} + \item[Construction.] + \texttt{generators::valid\_score\_rich(0xF302)} (the core crate's + generator), identically reachable as the test-kit corpus entry + \texttt{gen\_valid\_score\_rich} (the corpus pins the same seed). + \item[Content.] Three \emph{concurrent} regions on disjoint staves: a + metric region (measures, an eighth-note triplet tuplet, a tie, a + spanner, a marker, a chord symbol, a decomposition attachment), a + proportional region (wall-clock events), and an aleatoric region + (musical-discipline events) --- plus tombstoned pitch and event ids + and a spelling attachment resolving to a tombstoned pitch. Every + core graph invariant holds. + \item[Coverage.] Multi-region, multi-staff validity: concurrent + regions must each be cast off and placed without cross-region + interference. At the Minimal tier this entry demands validity and + honest diagnostics on the projection it induces --- the non-metric + regions reach the solver as ordinary constrained IR (their + decompositions deferred upstream), so the entry does \emph{not} + smuggle the Advanced tier's proportional/aleatoric layout obligation + into Minimal; it guards that a multi-region document neither breaks + hard constraints nor corrupts the report. + \item[Tiers, thresholds, expectations.] Required at Minimal; in the + Standard subset. Catalog default thresholds; no overrides; no fixed + expectations. +\end{description} + +\section{RS-3: B-flat Major Scale} +\label{sec:entries:rs3} + +\begin{description} + \item[Construction.] Corpus entry \texttt{b\_flat\_major\_scale} + (zero-argument deterministic builder). + \item[Content.] Seven quarter notes ascending through B-flat major + (B$\flat$ C D E$\flat$ F G A) in one metric region, one staff, one + voice --- accidentals inferred in a flat context. + \item[Coverage.] The accidental entry: flats produce glyph clusters + with left overhang, exercising overhang-aware spacing, the same-column + cluster of accidental and notehead (the collision axis's same-slot + exclusion), and the \texttt{Spacing} axis under uneven column + ink. Single system and page: the break-family and page axes + degenerate. + \item[Tiers, thresholds, expectations.] Required at Minimal; in the + Standard subset. Catalog default thresholds; no overrides; no fixed + expectations. +\end{description} + +\section{RS-4: Two-Voice Counterpoint} +\label{sec:entries:rs4} + +\begin{description} + \item[Construction.] Corpus builder \texttt{two\_voice\_counterpoint} + (zero-argument, deterministic). + \item[Content.] Two voices in one staff instance: an upper quarter-note + line and a lower quarter-note line two octaves beneath it, sounding + simultaneously. + \item[Coverage.] Simultaneity: both voices' notes share musical time + columns, so each spring slot carries a two-voice cluster, and the + low line sits below the staff (ledger territory). Exercises + same-column stacking, the collision sweep across a vertically spread + texture, and column-advance regularity when columns are ink-heavy. + Single system and page: the break-family and page axes degenerate. + \item[Tiers, thresholds, expectations.] Required at Minimal; in the + Standard subset. Catalog default thresholds; no overrides; no fixed + expectations. +\end{description} + +\section{RS-5: Notes and Rests} +\label{sec:entries:rs5} + +\begin{description} + \item[Construction.] Corpus entry \texttt{notes\_and\_rests} + (zero-argument deterministic builder). + \item[Content.] Note, rest, note, rest --- quarter values in one metric + region, one staff, one voice. + \item[Coverage.] Rest glyphs interleaved with noteheads: rest columns + carry different ink boxes than note columns, exercising the spacing + pass's treatment of mixed column content and the collision sweep over + non-notehead glyphs. Single system and page: the break-family and + page axes degenerate. + \item[Tiers, thresholds, expectations.] Required at Minimal; in the + Standard subset. Catalog default thresholds; no overrides; no fixed + expectations. +\end{description} + +\section{RS-6: Three-Four Meter Line} +\label{sec:entries:rs6} + +\begin{description} + \item[Construction.] Corpus entry \texttt{meter\_three\_four} + (zero-argument deterministic builder). + \item[Content.] Three quarter notes under a declared + $\tfrac{3}{4}$ time signature (three quarter-beat groups), in one + metric region, one staff, one voice. + \item[Coverage.] Meter variety: the declared time signature drives + measure length past the whole-note default, exercising the + meter-resolution path that feeds the layout projection. Guards that + a non-default meter neither breaks hard constraints nor perturbs + spacing regularity. Single system and page: the break-family and + page axes degenerate. + \item[Tiers, thresholds, expectations.] Required at Minimal; in the + Standard subset. Catalog default thresholds; no overrides; no fixed + expectations. +\end{description} + +% =========================================================================== +\chapter{Harness Binding (Non-Normative)} +\label{ch:harness} + +This chapter is informative. The reference implementation binds this +suite to executable checks in its test kit, following the test kit's +established library-module-per-harness pattern (one public module per +harness, mirroring the corpus and prepass harnesses, with an integration +test driving it). The suite harness constructs each Chapter~\ref{ch:entries} +entry from its named builder and seed, solves it under the declared +configuration, and asserts the Minimal-tier pass of +Requirement~\ref{req:refsuite:pass}; it is delivered with the reference +implementation. + +\begin{nongoal} +The harness is not part of this document's normative surface. Conformance +is defined by Chapters~\ref{ch:model} and~\ref{ch:entries} alone; an +independent implementation may bind the suite with any machinery that +evaluates the same entries under the same configurations. Likewise, the +reference implementation's golden files (SVG snapshots, byte-anchored +layouts) are that implementation's regression locks, not suite +conformance (Section~\ref{sec:model:fixed}). +\end{nongoal} + +% =========================================================================== +\chapter{Revision History} +\label{ch:history} + +\begin{longtable}{p{2cm} p{2.5cm} p{9cm}} + \toprule + \textbf{Date} & \textbf{Section} & \textbf{Change} \\ + \midrule + \endhead + \today & All & 0.1.0 --- Initial companion: pins the suite entry model + (builder-and-seed score referencing with the \texttt{.musc}-bundle open + question, per-entry solve configuration over the declared A4/8\,mm + default geometry, the four-condition per-entry pass rule, the + deliberately empty fixed-expectation set, suite-version declaration); + delivers the six-entry v0.1 set + (\texttt{ten\_measure\_single\_staff} seed \texttt{0x000A\_11CE}, + \texttt{valid\_score\_rich} seed \texttt{0xF302}, + \texttt{b\_flat\_major\_scale}, \texttt{two\_voice\_counterpoint}, + \texttt{notes\_and\_rests}, \texttt{meter\_three\_four}), all required + at Minimal and all constituting the Standard subset under the Quality + Metric Catalog's default thresholds, with no per-entry overrides. \\ +\bottomrule +\end{longtable} + +\end{document}