Add selector black list

README.md

@@ -37,6 +37,7 @@ Default:
     root_value: 16,
     unit_precision: 5,
     prop_white_list: ['font', 'font-size', 'line-height', 'letter-spacing'],
+    selector_black_list: [],
     replace: true,
     media_query: false
 }
@@ -45,6 +46,7 @@ Default:
 - `root_value` (Number) The root element font size.
 - `unit_precision` (Number) The decimal numbers to allow the REM units to grow to.
 - `prop_white_list` (Array) The properties that can change from px to rem.
+- `selector_black_list` (Array) The selectors to ignore and leave as px.
 - `replace` (Boolean) replaces rules containing rems instead of adding fallbacks.
 - `media_query` (Boolean) Allow px to be converted in media queries.
 

index.js

@@ -9,6 +9,7 @@ module.exports = postcss.plugin('postcss-pxtorem', function (options) {
         options = options || {};
         var rootValue = options.root_value || 16;
         var unitPrecision = options.unit_precision || 5;
+        var selectorBlackList = options.selector_black_list || [];
         var propWhiteList = options.prop_white_list || ['font', 'font-size', 'line-height', 'letter-spacing'];
         var replace = (options.replace === false) ? false : true;
         var mediaQuery = options.media_query || false;
@@ -22,6 +23,18 @@ module.exports = postcss.plugin('postcss-pxtorem', function (options) {
         css.eachDecl(function (decl, i) {
             if (propWhiteList.indexOf(decl.prop) === -1) return;
 
+            var selector = decl.parent.selector;
+            var match = false;
+            for (var j=0; j<selectorBlackList.length; j++) {
+                match = selector.match(selectorBlackList[j]);
+                if (match) {
+                    break;
+                }
+            }
+            if (match) {
+                return;
+            }
+
             var rule = decl.parent;
             var value = decl.value;
 

package.json

@@ -1,7 +1,7 @@
 {
   "name": "postcss-pxtorem",
   "description": "A CSS post-processor that converts px to rem.",
-  "version": "2.1.0",
+  "version": "2.2.0",
   "author": "cuth",
   "license": "MIT",
   "repository": {

spec/pxtorem-spec.js

@@ -12,6 +12,17 @@ var css = '.rule { font-size: 15px }';
 
 describe('pxtorem', function () {
 
+    it('should ignore selectors in the selector black list', function () {
+        var rules = '.rule { font-size: 15px } .rule2 { font-size: 15px }';
+        var expected = '.rule { font-size: 0.9375rem } .rule2 { font-size: 15px }';
+        var options = {
+            selector_black_list: ['.rule2']
+        };
+        var processed = postcss(pxtorem(options)).process(rules).css;
+
+        expect(processed).toBe(expected);
+    });
+
     it('should replace the px unit with rem', function () {
         var processed = postcss(pxtorem()).process(css).css;
         var expected = '.rule { font-size: 0.9375rem }';