feat: better supported hybrid units

lib/measurements/__tests__/plugin.test.js

@@ -244,4 +244,83 @@ describe('tools section scaling', () => {
     // Both should exist in countScalables
     expect(countScalables.length).toBeGreaterThanOrEqual(1);
   });
+});
+
+// ─── Hybrid Weight/Volume Measurements ───────────────────
+
+function getHybridAttrs(html) {
+  const matches = [];
+  const re = /data-hybrid="true"[^>]*data-volume-default="([^"]*)"[^>]*data-volume-alt="([^"]*)"(?:[^>]*data-volume-scalable="([^"]*)")?/g;
+  let m;
+  while ((m = re.exec(html)) !== null) {
+    matches.push({
+      volumeDefault: decodeHtmlEntities(m[1]),
+      volumeAlt: decodeHtmlEntities(m[2]),
+      volumeScalable: m[3] ? JSON.parse(decodeHtmlEntities(m[3])) : null,
+    });
+  }
+  return matches;
+}
+
+describe('hybrid weight/volume measurements', () => {
+  it('adds hybrid data attributes for weight with volume alt', () => {
+    const md = '- unsalted butter 80g (6 tablespoons)';
+    const html = render(md);
+    expect(html).toContain('data-hybrid="true"');
+    expect(html).toContain('data-volume-default=');
+    expect(html).toContain('data-volume-alt=');
+    expect(html).toContain('data-volume-scalable=');
+  });
+
+  it('does NOT add hybrid attributes for weight-to-weight alt', () => {
+    const md = '- butter 227g (8 oz)';
+    const html = render(md);
+    expect(html).not.toContain('data-hybrid');
+  });
+
+  it('generates correct volume texts for simple hybrid', () => {
+    const md = '- unsalted butter 80g (6 tablespoons)';
+    const html = render(md);
+    const hybrids = getHybridAttrs(html);
+    expect(hybrids.length).toBe(1);
+    // 6 tbsp = 6 * 14.787 = 88.722ml -> metric: "88.7ml"
+    expect(hybrids[0].volumeDefault).toBe('88.7ml');
+    expect(hybrids[0].volumeAlt).toBe('6 tbsp');
+  });
+
+  it('handles nested hybrid with intermediate', () => {
+    const md = '- milk 860g (800mL (3 1/3 cups))';
+    const html = render(md);
+    const hybrids = getHybridAttrs(html);
+    expect(hybrids.length).toBe(1);
+    expect(hybrids[0].volumeDefault).toBe('800ml');
+  });
+
+  it('includes volume scalable data with base in ml', () => {
+    const md = '- unsalted butter 80g (6 tablespoons)';
+    const html = render(md);
+    const hybrids = getHybridAttrs(html);
+    expect(hybrids.length).toBe(1);
+    expect(hybrids[0].volumeScalable).toBeDefined();
+    expect(hybrids[0].volumeScalable.type).toBe('volume');
+    // 6 tablespoons = 6 * 14.787 = 88.722 ml
+    expect(hybrids[0].volumeScalable.base).toBeCloseTo(88.722, 0);
+  });
+
+  it('includes volume scalable data for nested hybrid', () => {
+    const md = '- milk 860g (800mL (3 1/3 cups))';
+    const html = render(md);
+    const hybrids = getHybridAttrs(html);
+    expect(hybrids.length).toBe(1);
+    expect(hybrids[0].volumeScalable.type).toBe('volume');
+    expect(hybrids[0].volumeScalable.base).toBeCloseTo(800, 0);
+  });
+
+  it('still has weight data attributes alongside hybrid attrs', () => {
+    const md = '- unsalted butter 80g (6 tablespoons)';
+    const html = render(md);
+    // Should still have the weight default/alt
+    expect(html).toContain('data-default="80g"');
+    expect(html).toContain('data-measurement-type="weight"');
+  });
 });