fix: support animation percents

Author: dhlolo

.gitignore

@@ -3,3 +3,4 @@ coverage
 node_modules
 dist
 .idea
+.vscode

src/__tests__/tags.js

@@ -36,3 +36,8 @@ test('tag with attribute', 'label[for="email"]', (t, tree) => {
     t.deepEqual(tree.nodes[0].nodes[1].type, 'attribute');
     t.deepEqual(tree.nodes[0].nodes[1].quoteMark, '"');
 });
+
+test('keyframes animation tag selector', '0.00%', (t, tree) => {
+    t.deepEqual(tree.nodes[0].nodes[0].value, '0.00%');
+    t.deepEqual(tree.nodes[0].nodes[0].type, 'tag');
+});

src/parser.js

@@ -836,7 +836,13 @@ export default class Parser {
             }
             nextToken = this.nextToken;
         }
-        const hasClass = indexesOf(word, '.').filter(i => word[i - 1] !== '\\');
+        const hasClass = indexesOf(word, '.').filter(i => {
+            // Allow escaped dot within class name
+            const escapedDot = word[i - 1] === '\\';
+            // Allow decimal numbers percent in @keyframes
+            const isKeyframesPercent = /^\d+\.\d+%$/.test(word);
+            return !escapedDot && !isKeyframesPercent;
+        });
         let hasId = indexesOf(word, '#').filter(i => word[i - 1] !== '\\');
         // Eliminate Sass interpolations from the list of id indexes
         const interpolations = indexesOf(word, '#{');