fix: unknown functions hang. fixes #112 (#114)

Credit goes to @jonathantneal for identifying the offending code and cause.

Author: shellscape

lib/nodes/Func.js

@@ -14,7 +14,7 @@ const { registerWalker } = require('../walker');
 const Container = require('./Container');
 const Punctuation = require('./Punctuation');
 
-const allFunctions = [
+const cssFunctions = [
   'annotation',
   'attr',
   'blur',
@@ -85,7 +85,7 @@ const allFunctions = [
   'var'
 ];
 const vendorPrefixes = ['-webkit-', '-moz-', '-ms-', '-o-'];
-const reFunctions = new RegExp(`^(${vendorPrefixes.join('|')})?(${allFunctions.join('|')})`, 'i');
+const reFunctions = new RegExp(`^(${vendorPrefixes.join('|')})?(${cssFunctions.join('|')})`, 'i');
 const rePunctuation = new RegExp(`^(\\${Punctuation.chars.join('|\\')})`);
 const reColorFunctions = /^(hsla?|hwb|lab|lch|rgba?)$/i;
 const reVar = /^var$/i;
@@ -122,7 +122,8 @@ class Func extends Container {
     let lastToken = brackets;
 
     // fixes #92
-    if (!reFunctions.test(node.name) && !/^[a-zA-Z]+$/.test(node.name)) {
+    // eslint-disable-next-line no-useless-escape
+    if (!reFunctions.test(node.name) && !/^[a-zA-Z\-]+$/.test(node.name)) {
       const nameTokens = getTokens(node.name);
       tokens.unshift(...nameTokens, brackets);
       parser.back(tokens);

test/fixtures/func.js

@@ -45,7 +45,9 @@ module.exports = {
     'rotate(0.5grad)',
     'rotate(0.5turn)',
     '1em/var(--line-height)',
-    'local(foo),local(bar)'
+    'local(foo),local(bar)',
+    'bat-man(#000)',
+    'conic-gradient()'
   ],
 
   throws: ['url( /gfx/img/bg.jpg ']

test/snapshots/func.test.js.md

@@ -845,6 +845,78 @@ Generated by [AVA](https://avajs.dev).
       },
     ]
 
+## bat-man(#000)
+
+> Snapshot 1
+
+    'bat-man(#000)'
+
+> Snapshot 2
+
+    'bat-man(#000)'
+
+> Snapshot 3
+
+    [
+      Func {
+        isColor: false,
+        isVar: false,
+        name: 'bat-man',
+        nodes: [
+          Word {
+            isColor: true,
+            isHex: true,
+            isUrl: false,
+            isVariable: false,
+            parent: [Circular],
+            raws: {
+              after: '',
+              before: '',
+            },
+            source: {
+              end: {
+                column: 1,
+                line: 1,
+              },
+              input: Input {
+                css: '#000',
+                hasBOM: false,
+                id: '<input css 78>',
+              },
+              start: {
+                column: 1,
+                line: 1,
+              },
+            },
+            type: 'word',
+            value: '#000',
+          },
+        ],
+        params: '(#000)',
+        raws: {
+          after: '',
+          before: '',
+          semicolon: false,
+        },
+        source: {
+          end: {
+            column: 8,
+            line: 1,
+          },
+          input: Input {
+            css: 'bat-man(#000)',
+            hasBOM: false,
+            id: '<input css 77>',
+          },
+          start: {
+            column: 1,
+            line: 1,
+          },
+        },
+        type: 'func',
+      },
+    ]
+
 ## calc(((768px - 100vw) / 2) - 15px)
 
 > Snapshot 1
@@ -1475,6 +1547,48 @@ Generated by [AVA](https://avajs.dev).
       },
     ]
 
+## conic-gradient()
+
+> Snapshot 1
+
+    'conic-gradient()'
+
+> Snapshot 2
+
+    'conic-gradient()'
+
+> Snapshot 3
+
+    [
+      Func {
+        isColor: false,
+        isVar: false,
+        name: 'conic-gradient',
+        nodes: [],
+        params: '()',
+        raws: {
+          after: '',
+          before: '',
+        },
+        source: {
+          end: {
+            column: 15,
+            line: 1,
+          },
+          input: Input {
+            css: 'conic-gradient()',
+            hasBOM: false,
+            id: '<input css 79>',
+          },
+          start: {
+            column: 1,
+            line: 1,
+          },
+        },
+        type: 'func',
+      },
+    ]
+
 ## hwb(90deg 0% 0% / 0.5)
 
 > Snapshot 1