Don't strip pseudo classes that are preceded by a backslash

Addresses Munter/subfont#173

lib/stripPseudoClassesFromSelector.js

@@ -1,5 +1,5 @@
 const multiPseudoClassMatcher =
-  /(?::(?:active|any|checked|default|empty|enabled|fullscreen|focus|hover|indeterminate|in-range|invalid|link|optional|out-of-range|read-only|read-write|scope|target|valid|visited))+/gi;
+  /(?<!\\)(?::(?:active|any|checked|default|empty|enabled|fullscreen|focus|hover|indeterminate|in-range|invalid|link|optional|out-of-range|read-only|read-write|scope|target|valid|visited))+/gi;
 
 const cssCombinators = [' ', '>', '+', '~', '/'];
 

test/fontTracer.js

@@ -252,6 +252,25 @@ describe('fontTracer', function () {
     ]);
   });
 
+  // https://github.com/Munter/subfont/issues/173
+  it('should foo', function () {
+    const htmlText = [
+      '<style>.font-family\\:default {font-family: foo;}</style>',
+      '<h1 class="font-family:default">text</h1>',
+    ].join('');
+
+    return expect(htmlText, 'to satisfy computed font properties', [
+      {
+        text: 'text',
+        props: {
+          'font-family': 'foo',
+          'font-weight': 'bold',
+          'font-style': 'normal',
+        },
+      },
+    ]);
+  });
+
   it('should return font-weight as a string', function () {
     const htmlText = '<style>body { font-weight: 500; }</style>text';
 

test/stripPseudoClassesFromSelector.js

@@ -39,4 +39,8 @@ describe('stripPseudoClassesFromSelector', function () {
   it('should replace multiple consecutive pseudo class selectors directly following a selector with nothing', function () {
     expect(strip('div:hover:focus:visited'), 'to be', 'div');
   });
+
+  it('should not strip when the colon is escaped by a backslash', function () {
+    expect(strip('div\\:hover'), 'to be', 'div\\:hover');
+  });
 });