From b128aad311dab536382c6f86ede78320576780f4 Mon Sep 17 00:00:00 2001
From: Faris Ansari <netchamp.faris@gmail.com>
Date: Wed, 1 Nov 2017 22:33:19 +0530
Subject: [PATCH] add method removeCSSRule with test

---
 src/utils.js       | 13 +++++++++++++
 test/utils.spec.js | 13 ++++++++++++-
 2 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/src/utils.js b/src/utils.js
index 654aa59..2284a0e 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -180,6 +180,18 @@ function buildCSSRule(rule, styleMap, cssRulesString = '') {
   return `${cssRulesString}${getCSSRuleBlock(rule, styleMap)}`;
 }
 
+function removeCSSRule(rule, cssRulesString = '') {
+  const rulePatternStr = `${escapeRegExp(rule)} {([^}]*)}`;
+  const rulePattern = new RegExp(rulePatternStr, 'g');
+  let output = cssRulesString;
+
+  if (cssRulesString && cssRulesString.match(rulePattern)) {
+    output = cssRulesString.replace(rulePattern, '');
+  }
+
+  return output.trim();
+}
+
 export default {
   getHeaderHTML,
   getBodyHTML,
@@ -191,6 +203,7 @@ export default {
   namespaceSelector,
   getCSSString,
   buildCSSRule,
+  removeCSSRule,
   makeDataAttributeString,
   getDefault,
   escapeRegExp
diff --git a/test/utils.spec.js b/test/utils.spec.js
index 2362607..3d61164 100644
--- a/test/utils.spec.js
+++ b/test/utils.spec.js
@@ -4,7 +4,8 @@ import chai from 'chai';
 import {
 	makeDataAttributeString,
 	getCSSString,
-	buildCSSRule,
+  buildCSSRule,
+  removeCSSRule
 } from '../src/utils.js';
 
 chai.expect();
@@ -67,4 +68,14 @@ describe('#utils', () => {
         .to.be.equal('.test { width: 5px; height: 19px; margin-top: 3px; }.test2 { height: 45px; }');
     });
   });
+
+  describe('removeCSSRule', () => {
+    it('should remove the css rule based on the selector', () => {
+      const rule = '.test';
+      const cssRuleString = `.test {margin-top: 2px;} .test2 {color: blue;}`;
+
+      expect(removeCSSRule(rule, cssRuleString))
+        .to.be.equal('.test2 {color: blue;}');
+    })
+  })
 });