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/func.test.js.md

@@ -1871,6 +1871,90 @@ Generated by [AVA](https://avajs.dev).
       },
     ]
 
+## color.red(#6b717f)
+
+> Snapshot 1
+
+    'color.red(#6b717f)'
+
+> Snapshot 2
+
+    'color.red(#6b717f)'
+
+> Snapshot 3
+
+    [
+      Func {
+        isColor: false,
+        isVar: false,
+        name: 'color.red',
+        nodes: [
+          Word {
+            isColor: true,
+            isHex: true,
+            isUrl: false,
+            isVariable: false,
+            parent: [Circular],
+            raws: {
+              after: '',
+              before: '',
+            },
+            source: {
+              end: {
+                column: 1,
+                line: 1,
+                offset: 0,
+              },
+              input: Input {
+                css: '#6b717f',
+                hasBOM: false,
+                id: '<input css 1>',
+                [Symbol(fromOffset cache)]: [
+                  0,
+                ],
+              },
+              start: {
+                column: 1,
+                line: 1,
+                offset: 0,
+              },
+            },
+            type: 'word',
+            value: '#6b717f',
+            [Symbol(isClean)]: false,
+          },
+        ],
+        params: '(#6b717f)',
+        raws: {
+          after: '',
+          before: '',
+          semicolon: false,
+        },
+        source: {
+          end: {
+            column: 10,
+            line: 1,
+            offset: 9,
+          },
+          input: Input {
+            css: 'color.red(#6b717f)',
+            hasBOM: false,
+            id: '<input css 1>',
+            [Symbol(fromOffset cache)]: [
+              0,
+            ],
+          },
+          start: {
+            column: 1,
+            line: 1,
+            offset: 0,
+          },
+        },
+        type: 'func',
+        [Symbol(isClean)]: false,
+      },
+    ]
+
 ## conic-gradient()
 
 > Snapshot 1