feuerwerk/tests/core/fonts.test.ts

/**
 * A font is an asset holding an uploaded typeface, worn by a text object through its `font`
 * property the way a sprite wears a texture. Empty, or dangling, means the editor's own typeface.
 */
import { describe, expect, it } from 'vitest';
import {
  buildAsset,
  CreateAssetCommand,
  CreateFontCommand,
  SetAssetPropertyCommand,
} from '../../src/core/commands/assetCommands';
import type { FontAsset } from '../../src/core/model/Asset';
import { isPlaceableType } from '../../src/core/model/AssetTypes';
import { fontFamilyOf, fontFileOf, isFontFile } from '../../src/core/model/font';
import { assetRefChoices } from '../../src/core/properties/assetRef';
import { FONT_KEY, fontOf } from '../../src/core/properties/fonts';
import { schemaFor } from '../../src/core/properties/PropertySchema';
import { deserializeProject } from '../../src/core/store/serialize';
import { makeProject, roundTrip } from '../helpers';

const FILE = `${'a1'.repeat(32)}.ttf`;

function makeFont(name = 'Serif', file = FILE) {
  const fixture = makeProject();
  const command = new CreateFontCommand(name, file);
  fixture.stack.execute(command);
  return { ...fixture, font: command.asset };
}

describe('font files', () => {
  it('accepts only a content-addressed name in a supported format', () => {
    expect(isFontFile(FILE)).toBe(true);
    expect(isFontFile(`${'b3'.repeat(32)}.woff2`)).toBe(true);
    expect(isFontFile(`${'a1'.repeat(32)}.png`)).toBe(false);
    expect(isFontFile(`${'a1'.repeat(32)}.TTF`)).toBe(false);
    expect(isFontFile('DejaVuSerif.ttf')).toBe(false);
    expect(isFontFile('')).toBe(false);
  });

  it('names one family per file, and never two for the same bytes', () => {
    expect(fontFamilyOf(FILE)).toBe(fontFamilyOf(FILE));
    expect(fontFamilyOf(FILE)).not.toBe(fontFamilyOf(`${'b3'.repeat(32)}.ttf`));
    // A CSS family, so it has to survive being written into a font shorthand unquoted.
    expect(fontFamilyOf(FILE)).toMatch(/^[A-Za-z][\w-]*$/);
  });
});

describe('the font asset', () => {
  it('is not placeable and starts without a file', () => {
    expect(isPlaceableType('font')).toBe(false);
    expect(buildAsset('font', 'Font')).toMatchObject({ type: 'font', file: '' });
  });

  it('refuses a file name the server could not have produced', () => {
    const fixture = makeProject();
    // The stack lets the error through; the editor turns it into the notice the importer reports.
    expect(() => fixture.stack.execute(new CreateFontCommand('Bad', 'DejaVuSerif.ttf'))).toThrow(
      'is not a stored font file',
    );
    expect(fixture.project.assets).toHaveLength(0);
  });

  it('survives a round trip and drops a file name it cannot trust', () => {
    const f = makeFont();
    expect(roundTrip(f.project)).toEqual(f.project);

    const repaired = deserializeProject({
      name: 'P',
      assets: [
        { id: 'f1', type: 'font', name: 'Local', file: '../../etc/passwd' },
        { id: 'f2', type: 'font', name: 'Gone' },
      ],
    });
    expect(repaired.assets.map((a) => (a as FontAsset).file)).toEqual(['', '']);
  });
});

describe('the Font row on a text', () => {
  it('offers font assets and nothing else', () => {
    const f = makeFont();
    f.stack.execute(new CreateAssetCommand('text', 'Title'));
    const row = schemaFor('text').find((def) => def.key === FONT_KEY);
    expect(row).toMatchObject({ kind: 'asset', default: '', assetTypes: ['font'] });
    expect(assetRefChoices(f.project, ['font']).map((a) => a.id)).toEqual([f.font.id]);
  });

  it('resolves to a file, and to none when the id is unset or dangling', () => {
    const f = makeFont();
    const text = new CreateAssetCommand('text', 'Title');
    f.stack.execute(text);
    expect(fontOf(text.asset.props)).toBe('');
    expect(fontFileOf(f.project, '')).toBe('');

    f.stack.execute(new SetAssetPropertyCommand(text.asset.id, FONT_KEY, f.font.id));
    expect(fontFileOf(f.project, fontOf(text.asset.props))).toBe(FILE);

    expect(fontFileOf(f.project, 'no-such-asset')).toBe('');
    // A text asset is not a font asset: an id pointing at the wrong type wears nothing.
    expect(fontFileOf(f.project, text.asset.id)).toBe('');
  });
});