Fix 3 or more pairs

Closes GH-11.
Closes GH-12.

Co-authored-by: trueberryless <[email protected]>

Author: wooorm

lib/index.js

@@ -112,7 +112,7 @@ export default function retextQuotes(options) {
           expected = preferred === 'smart' ? '’' : "'"
         } else {
           const markers = preferred === 'smart' ? smart : straight
-          expected = markers[(stack.length + 1) % markers.length]
+          expected = markers[(stack.length - 1) % markers.length]
 
           if (expected.length > 1) {
             expected = expected.charAt(style.type === 'open' ? 0 : 1)

test.js

@@ -196,6 +196,14 @@ test('retextQuotes', async function (t) {
     }
   )
 
+  await t.test('should detect nesting correctly w/ 3 pairs', async function () {
+    const file = await retext()
+      .use(retextQuotes, {smart: ['“”', '‘’', '«»']})
+      .process('A sentence “with ‘multiple «nested “quotes”»’”.')
+
+    assert.deepEqual(file.messages.map(String), [])
+  })
+
   await t.test('should deal with funky nesting', async function () {
     const file = await retext().use(retextQuotes).process(soManyOpenings)