623 lines
22 KiB
Rust
623 lines
22 KiB
Rust
//! The event taxonomy and the event arena (Chapter 5 §"The Event Arena").
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//!
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//! Events are the rhythmic atoms of the score. All events of all kinds live in
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//! a single flat [`EventArena`] owned by the score; voices, cross-cutting
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//! structures, and analysis layers hold [`EventId`]s, not events (Chapter 5
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//! §"Design Principles": "Arena storage"). Every event carries its own
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//! identifier, its voice membership, and its position, stored on the event so
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//! operations can resolve context without traversing parents.
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//!
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//! ## Storage backend (QUICKSTART decision 2)
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//!
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//! The arena is a [`slotmap::SlotMap`] of events plus a hash index from
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//! [`EventId`] to the slot key. The slotmap gives generation-checked
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//! stale-handle detection (matching the spec's identifier-stability
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//! requirement) and the index gives the required `O(1)`-amortized lookup by
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//! `EventId` (Chapter 5 §"The Event Arena"). Canonical iteration is by
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//! ascending `EventId` (Appendix D §"Ordered Iteration").
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//!
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//! ## Forward-declared engraving types
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//!
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//! The decoration payloads on events (articulations, dynamics, ornaments, stem
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//! configuration, staff positions) are *introduced informally here and fully
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//! defined in Chapter 7* (the spec says so explicitly); they belong to Agent E
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//! (`epiphany-layout-ir`). This module carries minimal placeholders for them so
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//! the event records have their Chapter 5 shape without pre-empting Chapter 7.
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use std::collections::HashMap;
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use slotmap::{new_key_type, SlotMap};
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use crate::ids::{EventId, GraphicObjectId, VoiceId};
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use crate::pitch::IdentifiedPitch;
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use crate::time::{DurationBounds, EventDuration, EventPosition, MusicalDuration};
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// --- Forward-declared engraving placeholders (Chapter 7 / Agent E). ---------
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/// A staff line/space position for unpitched events and explicitly-placed
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/// rests (Chapter 5). Placeholder: the full vertical model is Chapter 7's.
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#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug, Default)]
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pub struct StaffPosition(pub i16);
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/// Reference to an unpitched instrument member (snare, kick, …) for sound
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/// mapping (Chapter 5). Placeholder for the audio-engine mapping.
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#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug, Default)]
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pub struct UnpitchedMemberId(pub u32);
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/// An articulation attached to an event. Placeholder (Chapter 7).
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#[derive(Clone, PartialEq, Eq, Hash, Debug, Default)]
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pub struct ArticulationMark;
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/// A single-event dynamic marking. Placeholder (Chapter 7).
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#[derive(Clone, PartialEq, Eq, Hash, Debug, Default)]
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pub struct DynamicMark;
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/// An ornament attached to an event. Placeholder (Chapter 7).
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#[derive(Clone, PartialEq, Eq, Hash, Debug, Default)]
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pub struct OrnamentMark;
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/// Stem configuration (direction, length adjustment, hidden). Placeholder
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/// (Chapter 7).
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#[derive(Clone, PartialEq, Eq, Hash, Debug, Default)]
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pub struct StemConfiguration;
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/// Hints constraining an indeterminate event. Placeholder for the full hint
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/// model; carries the duration bounds and alternative-event references, which
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/// are structural.
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#[derive(Clone, PartialEq, Eq, Hash, Debug, Default)]
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pub struct IndeterminacyHints {
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pub duration_bounds: Option<DurationBounds>,
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pub alternatives: Vec<EventId>,
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pub textual_instruction: Option<String>,
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}
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/// Visual representation of a trajectory. Placeholder (Chapter 7).
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#[derive(Clone, PartialEq, Eq, Hash, Debug, Default)]
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pub struct TrajectoryDisplay;
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/// A playback parameter binding for graphic content. Placeholder (audio
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/// engine).
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#[derive(Clone, PartialEq, Eq, Hash, Debug, Default)]
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pub struct PlaybackBinding;
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/// Rendering hints for a cue. Placeholder (Chapter 7).
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#[derive(Clone, PartialEq, Eq, Hash, Debug, Default)]
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pub struct CueRendering;
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// --- The event taxonomy (Chapter 5 §"The Event Type"). ----------------------
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/// Whether a note is a grace note, and of what kind (Chapter 5).
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#[derive(Clone, PartialEq, Eq, Hash, Debug)]
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pub enum GraceKind {
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Acciaccatura,
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Appoggiatura,
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Unmeasured,
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MeasuredFraction(MusicalDuration),
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}
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/// A pitched event: one or more identified pitches sounding together
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/// (Chapter 5 §"Pitched Events"). A single pitch is a note; multiple pitches
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/// are a chord.
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#[derive(Clone, PartialEq, Eq, Debug)]
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pub struct PitchedEvent {
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pub id: EventId,
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pub voice: VoiceId,
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pub position: EventPosition,
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pub duration: EventDuration,
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/// One or more identified pitches. Must be non-empty (use [`Rest`] for the
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/// no-pitch case); enforced by [`PitchedEvent::is_well_formed`].
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pub pitches: Vec<IdentifiedPitch>,
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pub articulations: Vec<ArticulationMark>,
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pub dynamic: Option<DynamicMark>,
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pub ornaments: Vec<OrnamentMark>,
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pub stem: StemConfiguration,
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pub grace: Option<GraceKind>,
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}
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impl PitchedEvent {
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/// A pitched event must have at least one pitch (Chapter 5: "Empty pitch
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/// lists are forbidden").
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pub fn is_well_formed(&self) -> bool {
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!self.pitches.is_empty()
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}
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}
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/// An unpitched percussion event (Chapter 5 §"Unpitched Events").
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#[derive(Clone, PartialEq, Eq, Debug)]
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pub struct UnpitchedEvent {
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pub id: EventId,
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pub voice: VoiceId,
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pub position: EventPosition,
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pub duration: EventDuration,
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pub staff_position: StaffPosition,
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pub instrument_member: UnpitchedMemberId,
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pub articulations: Vec<ArticulationMark>,
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pub dynamic: Option<DynamicMark>,
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pub stem: StemConfiguration,
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pub grace: Option<GraceKind>,
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}
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/// A rest: a duration without a sounding event (Chapter 5 §"Rests").
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#[derive(Clone, PartialEq, Eq, Debug)]
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pub struct Rest {
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pub id: EventId,
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pub voice: VoiceId,
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pub position: EventPosition,
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pub duration: EventDuration,
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pub vertical_position: Option<StaffPosition>,
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pub visible: bool,
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}
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/// What aspect of an indeterminate event is indeterminate (Chapter 5).
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#[derive(Clone, PartialEq, Eq, Hash, Debug)]
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pub enum IndeterminacyKind {
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Pitch,
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Duration,
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Choice,
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Compound(Vec<IndeterminacyKind>),
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}
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/// An event whose pitch, duration, or choice is deliberately indeterminate
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/// (Chapter 5 §"Indeterminate Events").
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#[derive(Clone, PartialEq, Eq, Debug)]
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pub struct IndeterminateEvent {
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pub id: EventId,
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pub voice: VoiceId,
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pub position: EventPosition,
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pub duration: EventDuration,
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pub indeterminacy: IndeterminacyKind,
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pub hints: IndeterminacyHints,
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}
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/// An endpoint of a trajectory: a reference to another event's pitch, or an
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/// explicit pitch local to the trajectory (Chapter 5 §"Trajectory Events").
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#[derive(Clone, PartialEq, Eq, Debug)]
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pub enum TrajectoryEndpoint {
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/// A pitch belonging to another event.
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EventPitch(crate::ids::PitchId),
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/// An explicit identified pitch local to this trajectory; participates in
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/// spelling and identity like an embedded pitch.
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ExplicitPitch(IdentifiedPitch),
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}
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/// The shape of a trajectory between its endpoints (Chapter 5).
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#[derive(Clone, PartialEq, Eq, Debug)]
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pub enum TrajectoryShape {
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Linear,
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Exponential,
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/// Control points (placeholder geometry; full type in Chapter 7).
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Curve,
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/// A stepwise sequence of identified pitches.
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Stepwise(Vec<IdentifiedPitch>),
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}
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/// A continuous pitch motion: glissando, portamento, or pitch bend
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/// (Chapter 5 §"Trajectory Events").
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#[derive(Clone, PartialEq, Eq, Debug)]
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pub struct TrajectoryEvent {
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pub id: EventId,
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pub voice: VoiceId,
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pub position: EventPosition,
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pub duration: EventDuration,
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pub start: TrajectoryEndpoint,
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pub end: TrajectoryEndpoint,
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pub shape: TrajectoryShape,
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pub display: TrajectoryDisplay,
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}
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/// An event whose primary content is graphic (Chapter 5 §"Graphic Events").
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#[derive(Clone, PartialEq, Eq, Debug)]
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pub struct GraphicEvent {
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pub id: EventId,
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pub voice: VoiceId,
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pub position: EventPosition,
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pub duration: EventDuration,
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pub graphics: Vec<GraphicObjectId>,
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pub playback_bindings: Vec<PlaybackBinding>,
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}
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/// A small-print rendering of music from another voice/instrument
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/// (Chapter 5 §"Cue Events").
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#[derive(Clone, PartialEq, Eq, Debug)]
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pub struct CueEvent {
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pub id: EventId,
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pub voice: VoiceId,
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pub position: EventPosition,
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pub duration: EventDuration,
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pub source: Vec<EventId>,
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pub rendering: CueRendering,
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}
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/// A rhythmic event of any kind (Chapter 5 §"The Event Type").
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#[derive(Clone, PartialEq, Eq, Debug)]
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pub enum Event {
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Pitched(PitchedEvent),
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Unpitched(UnpitchedEvent),
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Rest(Rest),
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Indeterminate(IndeterminateEvent),
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Trajectory(TrajectoryEvent),
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Graphic(GraphicEvent),
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Cue(CueEvent),
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}
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impl Event {
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/// The event's identifier.
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pub fn id(&self) -> EventId {
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match self {
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Event::Pitched(e) => e.id,
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Event::Unpitched(e) => e.id,
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Event::Rest(e) => e.id,
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Event::Indeterminate(e) => e.id,
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Event::Trajectory(e) => e.id,
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Event::Graphic(e) => e.id,
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Event::Cue(e) => e.id,
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}
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}
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/// The voice that owns this event.
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pub fn voice(&self) -> VoiceId {
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match self {
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Event::Pitched(e) => e.voice,
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Event::Unpitched(e) => e.voice,
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Event::Rest(e) => e.voice,
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Event::Indeterminate(e) => e.voice,
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Event::Trajectory(e) => e.voice,
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Event::Graphic(e) => e.voice,
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Event::Cue(e) => e.voice,
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}
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}
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/// The event's position within its voice and region.
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pub fn position(&self) -> &EventPosition {
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match self {
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Event::Pitched(e) => &e.position,
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Event::Unpitched(e) => &e.position,
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Event::Rest(e) => &e.position,
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Event::Indeterminate(e) => &e.position,
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Event::Trajectory(e) => &e.position,
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Event::Graphic(e) => &e.position,
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Event::Cue(e) => &e.position,
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}
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}
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/// The event's duration.
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pub fn duration(&self) -> &EventDuration {
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match self {
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Event::Pitched(e) => &e.duration,
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Event::Unpitched(e) => &e.duration,
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Event::Rest(e) => &e.duration,
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Event::Indeterminate(e) => &e.duration,
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Event::Trajectory(e) => &e.duration,
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Event::Graphic(e) => &e.duration,
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Event::Cue(e) => &e.duration,
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}
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}
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/// Sets the voice membership (used by generators and edit operations).
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pub fn set_voice(&mut self, voice: VoiceId) {
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match self {
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Event::Pitched(e) => e.voice = voice,
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Event::Unpitched(e) => e.voice = voice,
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Event::Rest(e) => e.voice = voice,
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Event::Indeterminate(e) => e.voice = voice,
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Event::Trajectory(e) => e.voice = voice,
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Event::Graphic(e) => e.voice = voice,
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Event::Cue(e) => e.voice = voice,
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}
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}
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/// Sets the event's region-local position (used by time-model migration
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/// during canonical operation reduction).
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pub fn set_position(&mut self, position: EventPosition) {
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match self {
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Event::Pitched(e) => e.position = position,
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Event::Unpitched(e) => e.position = position,
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Event::Rest(e) => e.position = position,
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Event::Indeterminate(e) => e.position = position,
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Event::Trajectory(e) => e.position = position,
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Event::Graphic(e) => e.position = position,
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Event::Cue(e) => e.position = position,
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}
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}
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/// Appends references to every [`IdentifiedPitch`] this event embeds:
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/// chord pitches for [`Event::Pitched`], and explicit/stepwise pitches for
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/// [`Event::Trajectory`]. Used by the pitch-uniqueness invariant.
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pub fn collect_identified_pitches<'a>(&'a self, out: &mut Vec<&'a IdentifiedPitch>) {
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match self {
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Event::Pitched(e) => out.extend(e.pitches.iter()),
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Event::Trajectory(e) => {
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for ep in [&e.start, &e.end] {
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if let TrajectoryEndpoint::ExplicitPitch(ip) = ep {
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out.push(ip);
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}
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}
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if let TrajectoryShape::Stepwise(ps) = &e.shape {
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out.extend(ps.iter());
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}
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}
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_ => {}
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}
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}
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}
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new_key_type! {
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/// A generation-checked handle into the [`EventArena`]'s slot storage.
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/// Stale handles are detected by the slotmap rather than silently aliasing
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/// a recycled slot (the identifier-stability discipline of Chapter 5).
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pub struct EventKey;
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}
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/// Why an arena insertion failed.
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#[derive(Copy, Clone, PartialEq, Eq, Debug)]
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pub enum ArenaError {
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/// An event with this identifier already exists. Identifiers are unique
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/// within a score (Chapter 5 invariant 11) and never reused.
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DuplicateId(EventId),
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/// A [`PitchedEvent`] was inserted with no pitches. "A `PitchedEvent` MUST
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/// have at least one pitch. Empty pitch lists are forbidden; use `Rest` for
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/// the no-pitch case." (Chapter 5 §"Pitched Events".) Enforced at the
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/// construction boundary so a malformed pitched event never enters the
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/// arena in the first place.
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EmptyPitchedEvent(EventId),
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}
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impl core::fmt::Display for ArenaError {
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fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
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match self {
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ArenaError::DuplicateId(id) => write!(f, "duplicate EventId {id:?} in arena"),
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ArenaError::EmptyPitchedEvent(id) => {
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write!(f, "pitched event {id:?} has no pitches (Chapter 5)")
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}
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}
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}
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}
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impl std::error::Error for ArenaError {}
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/// The flat arena of all events in a score (Chapter 5 §"The Event Arena").
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///
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/// Observable contract: `O(1)`-amortized lookup by [`EventId`] and stable
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/// handles for the lifetime of the event. Canonical iteration
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/// ([`EventArena::iter_canonical`]) is by ascending `EventId`.
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#[derive(Clone, Debug, Default)]
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pub struct EventArena {
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slots: SlotMap<EventKey, Event>,
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by_id: HashMap<EventId, EventKey>,
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}
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impl PartialEq for EventArena {
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fn eq(&self, other: &Self) -> bool {
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let ids = self.ids_canonical();
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ids == other.ids_canonical() && ids.into_iter().all(|id| self.get(id) == other.get(id))
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}
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}
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impl Eq for EventArena {}
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impl EventArena {
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/// An empty arena.
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pub fn new() -> Self {
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EventArena {
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slots: SlotMap::with_key(),
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by_id: HashMap::new(),
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}
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}
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/// Inserts an event, rejecting a duplicate identifier (invariant 11) and a
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/// pitched event with no pitches (Chapter 5 §"Pitched Events"). Enforcing
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/// the latter here keeps `PitchedEvent::is_well_formed` from being merely
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/// advisory: an empty pitched event cannot enter the arena.
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pub fn insert(&mut self, event: Event) -> Result<EventKey, ArenaError> {
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let id = event.id();
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if let Event::Pitched(p) = &event {
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if !p.is_well_formed() {
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return Err(ArenaError::EmptyPitchedEvent(id));
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}
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}
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if self.by_id.contains_key(&id) {
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return Err(ArenaError::DuplicateId(id));
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}
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let key = self.slots.insert(event);
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self.by_id.insert(id, key);
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Ok(key)
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}
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/// `O(1)`-amortized lookup by identifier.
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pub fn get(&self, id: EventId) -> Option<&Event> {
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self.by_id.get(&id).and_then(|k| self.slots.get(*k))
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}
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/// Mutable lookup by identifier.
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pub fn get_mut(&mut self, id: EventId) -> Option<&mut Event> {
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match self.by_id.get(&id) {
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Some(k) => self.slots.get_mut(*k),
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None => None,
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}
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}
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/// Whether an event with this identifier is live in the arena.
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pub fn contains(&self, id: EventId) -> bool {
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self.by_id.contains_key(&id)
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}
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/// Removes an event by identifier (the live-storage side of a tombstone;
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/// tombstone *tracking* is `epiphany-ops`, Chapter 6). The identifier is
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/// never re-minted, so re-inserting the same id is a caller error.
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pub fn remove(&mut self, id: EventId) -> Option<Event> {
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let key = self.by_id.remove(&id)?;
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self.slots.remove(key)
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}
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/// Identifiers whose index entry is inconsistent: the `by_id` key no longer
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/// resolves, or resolves to an event whose own `id()` differs from the key.
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/// This catches post-insertion corruption via [`EventArena::get_mut`] (e.g.
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/// mutating an event's id), which the safe [`EventArena::insert`] path
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/// cannot produce. Empty for a well-formed arena.
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pub fn index_inconsistencies(&self) -> Vec<EventId> {
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self.by_id
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.iter()
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.filter(|(id, key)| self.slots.get(**key).map(|e| e.id()) != Some(**id))
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.map(|(id, _)| *id)
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.collect()
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}
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/// Live pitched events that are malformed (no pitches). [`EventArena::insert`]
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/// rejects these, but [`EventArena::get_mut`] could clear a chord's pitches
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/// after insertion; this re-checks (Chapter 5 §"Pitched Events").
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pub fn malformed_pitched_events(&self) -> Vec<EventId> {
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self.slots
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.values()
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.filter_map(|e| match e {
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Event::Pitched(p) if !p.is_well_formed() => Some(p.id),
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_ => None,
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})
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.collect()
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}
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/// Number of live events.
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pub fn len(&self) -> usize {
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self.slots.len()
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}
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/// Whether the arena holds no live events.
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pub fn is_empty(&self) -> bool {
|
|
self.slots.is_empty()
|
|
}
|
|
|
|
/// Iterates live events in unspecified (storage) order. Use
|
|
/// [`EventArena::iter_canonical`] where canonical output depends on order.
|
|
pub fn iter(&self) -> impl Iterator<Item = &Event> {
|
|
self.slots.values()
|
|
}
|
|
|
|
/// Live event identifiers, ascending (Appendix D §"Ordered Iteration":
|
|
/// lexicographic on the identifier's canonical byte form, which for these
|
|
/// identifiers is numeric order).
|
|
pub fn ids_canonical(&self) -> Vec<EventId> {
|
|
let mut ids: Vec<EventId> = self.by_id.keys().copied().collect();
|
|
ids.sort();
|
|
ids
|
|
}
|
|
|
|
/// Iterates live events in canonical [`EventId`] order.
|
|
pub fn iter_canonical(&self) -> impl Iterator<Item = &Event> + '_ {
|
|
self.ids_canonical()
|
|
.into_iter()
|
|
.map(move |id| self.get(id).expect("indexed id resolves"))
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::*;
|
|
use crate::ids::ReplicaId;
|
|
use crate::pitch::{
|
|
AcousticPitch, AcousticRealization, CmnNominal, Pitch, PitchSpaceId, PitchSpacePosition,
|
|
ScalePosition, TuningReference,
|
|
};
|
|
use crate::time::{MusicalPosition, RationalTime};
|
|
|
|
fn rest(id: EventId, voice: VoiceId, beat: i64) -> Event {
|
|
Event::Rest(Rest {
|
|
id,
|
|
voice,
|
|
position: EventPosition::Musical(MusicalPosition(RationalTime::new(beat, 4).unwrap())),
|
|
duration: EventDuration::Musical(MusicalDuration(RationalTime::new(1, 4).unwrap())),
|
|
vertical_position: None,
|
|
visible: true,
|
|
})
|
|
}
|
|
|
|
#[test]
|
|
fn arena_lookup_and_duplicate_rejection() {
|
|
let mut arena = EventArena::new();
|
|
let r = ReplicaId(1);
|
|
let v = VoiceId::new(r, 100);
|
|
let e0 = EventId::new(r, 0);
|
|
let e1 = EventId::new(r, 1);
|
|
arena.insert(rest(e0, v, 0)).unwrap();
|
|
arena.insert(rest(e1, v, 1)).unwrap();
|
|
assert_eq!(arena.len(), 2);
|
|
assert!(arena.contains(e0));
|
|
assert_eq!(arena.get(e0).unwrap().id(), e0);
|
|
// Duplicate id rejected.
|
|
assert_eq!(
|
|
arena.insert(rest(e0, v, 2)),
|
|
Err(ArenaError::DuplicateId(e0))
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn empty_pitched_event_is_rejected_at_insertion() {
|
|
let mut arena = EventArena::new();
|
|
let r = ReplicaId(1);
|
|
let v = VoiceId::new(r, 1);
|
|
let eid = EventId::new(r, 0);
|
|
let empty = Event::Pitched(PitchedEvent {
|
|
id: eid,
|
|
voice: v,
|
|
position: EventPosition::Musical(MusicalPosition::origin()),
|
|
duration: EventDuration::Musical(MusicalDuration::whole()),
|
|
pitches: vec![],
|
|
articulations: vec![],
|
|
dynamic: None,
|
|
ornaments: vec![],
|
|
stem: StemConfiguration,
|
|
grace: None,
|
|
});
|
|
assert_eq!(arena.insert(empty), Err(ArenaError::EmptyPitchedEvent(eid)));
|
|
assert!(arena.is_empty());
|
|
}
|
|
|
|
#[test]
|
|
fn canonical_iteration_is_by_ascending_id() {
|
|
let mut arena = EventArena::new();
|
|
let r = ReplicaId(1);
|
|
let v = VoiceId::new(r, 100);
|
|
// Insert out of id order.
|
|
for c in [5u64, 1, 9, 3] {
|
|
arena.insert(rest(EventId::new(r, c), v, c as i64)).unwrap();
|
|
}
|
|
let ids: Vec<u64> = arena.iter_canonical().map(|e| e.id().counter()).collect();
|
|
assert_eq!(ids, vec![1, 3, 5, 9]);
|
|
}
|
|
|
|
#[test]
|
|
fn collects_embedded_and_trajectory_pitches() {
|
|
let r = ReplicaId(1);
|
|
let v = VoiceId::new(r, 1);
|
|
let mk_ip = |c: u64| IdentifiedPitch {
|
|
id: crate::ids::PitchId::new(r, c),
|
|
pitch: Pitch {
|
|
scale_position: ScalePosition {
|
|
space: PitchSpaceId::new("cmn-12"),
|
|
position: PitchSpacePosition::Cmn {
|
|
nominal: CmnNominal::C,
|
|
alteration: 0,
|
|
octave: 4,
|
|
},
|
|
},
|
|
acoustic: AcousticPitch {
|
|
tuning: TuningReference::Inherit,
|
|
realization: AcousticRealization::Implicit,
|
|
},
|
|
},
|
|
};
|
|
let chord = Event::Pitched(PitchedEvent {
|
|
id: EventId::new(r, 0),
|
|
voice: v,
|
|
position: EventPosition::Musical(MusicalPosition::origin()),
|
|
duration: EventDuration::Musical(MusicalDuration::whole()),
|
|
pitches: vec![mk_ip(10), mk_ip(11)],
|
|
articulations: vec![],
|
|
dynamic: None,
|
|
ornaments: vec![],
|
|
stem: StemConfiguration,
|
|
grace: None,
|
|
});
|
|
let mut out = Vec::new();
|
|
chord.collect_identified_pitches(&mut out);
|
|
assert_eq!(out.len(), 2);
|
|
}
|
|
}
|