Fix error on loose quotes

Closes GH-13.

Author: wooorm

lib/index.js

@@ -87,6 +87,7 @@ export default function retextQuotes(options) {
       /** @type {Array<Marker>} */
       const stack = []
 
+      // eslint-disable-next-line complexity
       visit(paragraph, 'PunctuationNode', function (node, index, parent) {
         const actual = toString(node)
         const style = check(actual, straight, smart)
@@ -112,7 +113,14 @@ export default function retextQuotes(options) {
           expected = preferred === 'smart' ? '’' : "'"
         } else {
           const markers = preferred === 'smart' ? smart : straight
-          expected = markers[(stack.length - 1) % markers.length]
+
+          // Loose closing quote, looks like an apostrophe.
+          if (stack.length === 0 && (actual === '’' || actual === "'")) return
+
+          expected =
+            markers[
+              (stack.length === 0 ? 0 : stack.length - 1) % markers.length
+            ]
 
           if (expected.length > 1) {
             expected = expected.charAt(style.type === 'open' ? 0 : 1)

test.js

@@ -196,17 +196,75 @@ test('retextQuotes', async function (t) {
     }
   )
 
-  await t.test('should detect nesting correctly w/ 3 pairs', async function () {
+  await t.test('should detect nesting correctly w/ 1 pair', async function () {
     const file = await retext()
-      .use(retextQuotes, {smart: ['“”', '‘’', '«»']})
-      .process('A sentence “with ‘multiple «nested “quotes”»’”.')
+      .use(retextQuotes, {smart: ['“”']})
+      .process(
+        `A sentence with “quotes”.
+
+A sentence with “nested “quotes””.
+
+A sentence with “multiple “nested “quotes”””.
+
+Mismatched closing” quotes.
+
+Mismatched closing’ quotes.
+
+Mismatched “opening quotes.
+
+Mismatched ‘opening quotes.
+`
+      )
 
     assert.deepEqual(file.messages.map(String), [])
   })
 
+  await t.test('should detect nesting correctly w/ 2 pairs', async function () {
+    const file = await retext().use(retextQuotes, {smart: ['“”', '‘’']})
+      .process(`A sentence with “quotes”.
+
+A sentence with “nested ‘quotes’”.
+
+A sentence with “multiple ‘nested “quotes”’”.
+
+Mismatched closing” quotes.
+
+Mismatched closing’ quotes.
+
+Mismatched “opening quotes.
+
+Mismatched ‘opening quotes.
+`)
+
+    assert.deepEqual(file.messages.map(String), [
+      '13:12-13:13: Unexpected `‘` at this level of nesting, expected `“`'
+    ])
+  })
+
+  await t.test('should detect nesting correctly w/ 3 pairs', async function () {
+    const file = await retext().use(retextQuotes, {smart: ['“”', '‘’', '«»']})
+      .process(`A sentence with “quotes”.
+
+A sentence with “nested ‘quotes’”.
+
+A sentence with “multiple ‘nested «quotes»’”.
+
+Mismatched closing” quotes.
+
+Mismatched closing’ quotes.
+
+Mismatched “opening quotes.
+
+Mismatched ‘opening quotes.
+`)
+
+    assert.deepEqual(file.messages.map(String), [
+      '13:12-13:13: Unexpected `‘` at this level of nesting, expected `“`'
+    ])
+  })
+
   await t.test('should deal with funky nesting', async function () {
     const file = await retext().use(retextQuotes).process(soManyOpenings)
-
     assert.deepEqual(file.messages.map(String), [])
   })