fix: Function with dot inside name

Author: niksy

lib/nodes/Func.js

@@ -123,7 +123,7 @@ class Func extends Container {
 
     // fixes #92
     // eslint-disable-next-line no-useless-escape
-    if (!reFunctions.test(node.name) && !/^[a-zA-Z\-]+$/.test(node.name)) {
+    if (!reFunctions.test(node.name) && !/^[a-zA-Z\-\.]+$/.test(node.name)) {
       const nameTokens = getTokens(node.name);
       tokens.unshift(...nameTokens, brackets);
       parser.back(tokens);

test/fixtures/func.js

@@ -47,7 +47,8 @@ module.exports = {
     '1em/var(--line-height)',
     'local(foo),local(bar)',
     'bat-man(#000)',
-    'conic-gradient()'
+    'conic-gradient()',
+    'color.red(#6b717f)'
   ],
 
   throws: ['url( /gfx/img/bg.jpg ']

test/snapshots/atword.test.js.md

@@ -28,11 +28,9 @@ Generated by [AVA](https://avajs.dev).
         source: {
           input: Input {
             css: '  @word ',
+            fromOffset: Function {},
             hasBOM: false,
             id: '<input css 1>',
-            [Symbol(fromOffset cache)]: [
-              0,
-            ],
           },
           start: {
             column: 3,
@@ -41,6 +39,7 @@ Generated by [AVA](https://avajs.dev).
           },
         },
         type: 'atword',
+        [Symbol(isComplete)]: false,
         [Symbol(isClean)]: false,
       },
     ]