acorde-core

Score data model and command engine for Rust and WebAssembly.

This crate has no I/O, filesystem, renderer, or async-runtime dependency. It provides Score, Part, Staff, Measure, Note, notation types, ScoreEngine, serializable Command values, undo/redo, validation, playback-event generation, score diff/patch, transposition, and music-theory helpers. Pitches preserve fractional cents, while notes and staves can carry tablature string/fret and tuning metadata with serde defaults for older score JSON. assign_tablature_positions provides deterministic capo-aware placement, while optimize_tablature_positions considers movement between notes and chord strings. SetTabPositionCmd makes explicit positions editable through the command engine.

use acorde_core::{Command, ScoreEngine, SetTempoCmd};

let mut engine = ScoreEngine::new();
engine.apply(Command::SetTempo(SetTempoCmd { bpm: 120 }))?;
engine.undo()?;

The current Score JSON schema version is 1. MIDI pitch-bend events are preserved per part as signed 14-bit values with PPQ tick and channel metadata. Add acorde-io for format conversion and acorde-layout for renderer-independent layout.

Security invariants and resource-limit ownership are documented in the security contract.

API documentation · Repository