feuerwerk/tests/core/pattern.test.ts

import { describe, expect, it } from 'vitest';
import { CreateAssetCommand, SetAssetPropertyCommand } from '../../src/core/commands/assetCommands';
import { SetPatternLoopCommand, SetPatternNotesCommand } from '../../src/core/commands/patternCommands';
import { namedNotes } from '../../src/core/instrument/compile';
import { starterInstrumentGraph } from '../../src/core/instrument/nodes';
import type { PatternAsset } from '../../src/core/model/Asset';
import {
  DEFAULT_GRID,
  gridTicks,
  heldPatternNotes,
  patternGrid,
  patternLength,
  patternLoop,
  patternMeter,
  type PatternNote,
  patternSequence,
  patternTempo,
} from '../../src/core/music/pattern';
import { schemaForAsset } from '../../src/core/properties/PropertySchema';
import { makeProject, roundTrip } from '../helpers';

function makePattern() {
  const f = makeProject();
  const create = new CreateAssetCommand('pattern', 'Beat');
  f.stack.execute(create);
  const asset = create.asset;
  const pattern = () => f.project.assets.find((a) => a.id === asset.id) as PatternAsset;
  const set = (key: string, value: string | number) =>
    f.stack.execute(new SetAssetPropertyCommand(asset.id, key, value));
  return { ...f, id: asset.id, pattern, set };
}

const note = (id: string, tick: number, length: number, n = 60, velocity = 0.8): PatternNote => ({
  id,
  tick,
  length,
  note: n,
  velocity,
});

describe('pattern asset (#333)', () => {
  it('starts empty: four bars of 4/4 at 120 BPM on a 1/16 grid, no instrument', () => {
    const f = makePattern();
    const p = f.pattern();
    expect(p.notes).toEqual([]);
    expect(p.loop).toBeUndefined();
    expect(patternMeter(p.props)).toEqual({ beats: 4, unit: 4 });
    expect(patternTempo(p.props)).toBe(120);
    expect(patternGrid(p.props)).toBe(120);
    expect(patternLength(p)).toBe(4 * 1920);
    expect(schemaForAsset(f.project, p).map((d) => d.key)).toEqual([
      'instrument',
      'bars',
      'grid',
      'beats',
      'beat',
      'tempo',
      'fx',
      'bus',
    ]);
  });

  it('counts its grids in whole ticks, triplets too', () => {
    expect(['1/1', '1/4', '1/16', '1/32', '1/4T', '1/8T', '1/16T', '1/32T'].map(gridTicks)).toEqual([
      1920, 480, 120, 60, 320, 160, 80, 40,
    ]);
    expect(gridTicks('nonsense')).toBe(gridTicks(DEFAULT_GRID));
  });

  it('measures its length in bars of its meter: 3 bars of 6/8 are 4320 ticks', () => {
    const f = makePattern();
    f.set('bars', 3);
    f.set('beats', 6);
    f.set('beat', '8');
    expect(patternLength(f.pattern())).toBe(3 * 6 * 240);
  });

  it('holds notes to whole ticks, a tick at least, the keyboard and 0 to 1, sorted, ids unique', () => {
    const held = heldPatternNotes([
      { id: 'b', tick: 480.4, length: 0.2, note: 64, velocity: 2 },
      { id: 'a', tick: 0, length: 240, note: 60, velocity: 0.5 },
      { id: 'a', tick: 0, length: 240, note: 67, velocity: 0.5 },
      { id: 'c', tick: -10, length: 240, note: 60 },
      { id: 'd', tick: 0, length: 240, note: 128 },
      'junk',
    ]);
    expect(held.map((n) => [n.tick, n.length, n.note, n.velocity])).toEqual([
      [0, 240, 60, 0.5],
      [0, 240, 67, 0.5],
      [480, 1, 64, 1],
    ]);
    expect(new Set(held.map((n) => n.id)).size).toBe(3);
    expect(held[0]!.id).toBe('a');
  });

  it('plays nothing without an instrument; with one, the notes before its end, cut off there', () => {
    const f = makePattern();
    f.set('bars', 1);
    f.stack.execute(
      new SetPatternNotesCommand(f.id, [
        note('a', 0, 480),
        note('b', 1800, 480, 62),
        note('c', 1920, 240, 64),
      ]),
    );
    expect(patternSequence(f.pattern()).notes).toEqual([]);
    const ins = new CreateAssetCommand('instrument', 'Piano');
    f.stack.execute(ins);
    f.set('instrument', ins.asset.id);
    expect(patternSequence(f.pattern()).notes).toEqual([
      { tick: 0, length: 480, note: 60, velocity: 0.8, instrument: ins.asset.id },
      { tick: 1800, length: 120, note: 62, velocity: 0.8, instrument: ins.asset.id },
    ]);
  });

  it('writes the notes in one undo step, and none when they read the same', () => {
    const f = makePattern();
    const notes = [note('a', 0, 120)];
    f.stack.execute(new SetPatternNotesCommand(f.id, notes, 'Draw note'));
    expect(f.pattern().notes).toEqual(notes);
    expect(SetPatternNotesCommand.changes(f.pattern(), notes)).toBe(false);
    expect(SetPatternNotesCommand.changes(f.pattern(), [note('a', 120, 120)])).toBe(true);
    f.stack.undo();
    expect(f.pattern().notes).toEqual([]);
  });

  it('loops the whole pattern until a loop is set, and a loop is cut at its end', () => {
    const f = makePattern();
    expect(patternLoop(f.pattern())).toEqual({ start: 0, end: 7680 });
    f.stack.execute(new SetPatternLoopCommand(f.id, { start: 1920, end: 9600 }));
    expect(f.pattern().loop).toEqual({ start: 1920, end: 9600 });
    expect(patternLoop(f.pattern())).toEqual({ start: 1920, end: 7680 });
    f.set('bars', 1);
    expect(patternLoop(f.pattern())).toEqual({ start: 0, end: 1920 });
    f.stack.execute(new SetPatternLoopCommand(f.id, null));
    expect(f.pattern().loop).toBeUndefined();
    f.stack.undo();
    expect(f.pattern().loop).toEqual({ start: 1920, end: 9600 });
  });

  it('survives a round trip with its notes and its loop', () => {
    const f = makePattern();
    f.stack.execute(
      new SetPatternNotesCommand(f.id, [note('a', 0, 120, 36, 1), note('b', 240, 60, 38, 0.25)]),
    );
    f.stack.execute(new SetPatternLoopCommand(f.id, { start: 0, end: 960 }));
    f.set('grid', '1/8T');
    const back = roundTrip(f.project).assets.find((a) => a.id === f.id) as PatternAsset;
    expect(back.notes).toEqual(f.pattern().notes);
    expect(back.loop).toEqual({ start: 0, end: 960 });
    expect(patternGrid(back.props)).toBe(160);
  });

  it('reads the names a drum kit gives its notes, for the keys of the roll', () => {
    const graph = starterInstrumentGraph();
    const notes = graph.nodes.find((n) => n.type === 'InstrumentNotes')!;
    Object.assign(notes.params, { from: 36, to: 38, singleNotes: true, name36: 'Kick', name38: ' Snare ' });
    expect([...namedNotes(graph)]).toEqual([
      [36, 'Kick'],
      [38, 'Snare'],
    ]);
    notes.params.singleNotes = false;
    expect(namedNotes(graph).size).toBe(0);
  });
});