2 files changed, 43 insertions, 0 deletions
diff --git a/sonar-css-plugin/src/main/java/org/sonar/css/plugin/rules/SelectorPseudoElementNoUnknown.java b/sonar-css-plugin/src/main/java/org/sonar/css/plugin/rules/SelectorPseudoElementNoUnknown.java
index c26dfc2..8682859 100644
--- a/sonar-css-plugin/src/main/java/org/sonar/css/plugin/rules/SelectorPseudoElementNoUnknown.java
+++ b/sonar-css-plugin/src/main/java/org/sonar/css/plugin/rules/SelectorPseudoElementNoUnknown.java
@@ -19,13 +19,41 @@
  */
 package org.sonar.css.plugin.rules;
 
+import java.util.Arrays;
+import java.util.List;
 import org.sonar.check.Rule;
+import org.sonar.check.RuleProperty;
+
+import static org.sonar.css.plugin.rules.RuleUtils.splitAndTrim;
 
 @Rule(key = "S4660")
 public class SelectorPseudoElementNoUnknown implements CssRule {
 
+  private static final String DEFAULT_IGNORE_PSEUDO_ELEMENTS = "ng-deep";
+
   @Override
   public String stylelintKey() {
     return "selector-pseudo-element-no-unknown";
   }
+
+  @RuleProperty(
+    key = "ignorePseudoElements",
+    description = "Comma-separated list of regular expressions or strings to ignore (e.g. /^custom-/).",
+    defaultValue = "" + DEFAULT_IGNORE_PSEUDO_ELEMENTS)
+  String ignorePseudoElements = DEFAULT_IGNORE_PSEUDO_ELEMENTS;
+
+  @Override
+  public List<Object> stylelintOptions() {
+    return Arrays.asList(true, new StylelintIgnorePseudoElementsOption(splitAndTrim(ignorePseudoElements)));
+  }
+
+  private static class StylelintIgnorePseudoElementsOption {
+    // Used by GSON serialization
+    private final List<String> ignorePseudoElements;
+
+    StylelintIgnorePseudoElementsOption(List<String> ignorePseudoElements) {
+      this.ignorePseudoElements = ignorePseudoElements;
+    }
+  }
+
 }
diff --git a/sonar-css-plugin/src/test/java/org/sonar/css/plugin/rules/CssRuleTest.java b/sonar-css-plugin/src/test/java/org/sonar/css/plugin/rules/CssRuleTest.java
index e7945b7..bd18c4b 100644
--- a/sonar-css-plugin/src/test/java/org/sonar/css/plugin/rules/CssRuleTest.java
+++ b/sonar-css-plugin/src/test/java/org/sonar/css/plugin/rules/CssRuleTest.java
@@ -46,6 +46,7 @@ public class CssRuleTest {
       DeclarationBlockNoDuplicateProperties.class,
       PropertyNoUnknown.class,
       SelectorPseudoClassNoUnknown.class,
+      SelectorPseudoElementNoUnknown.class,
       SelectorTypeNoUnknown.class,
       UnitNoUnknown.class);
 
@@ -86,6 +87,20 @@ public class CssRuleTest {
   }
 
   @Test
+  public void selector_pseudo_element_no_unknown_default() {
+    String optionsAsJson = new Gson().toJson(new SelectorPseudoElementNoUnknown().stylelintOptions());
+    assertThat(optionsAsJson).isEqualTo("[true,{\"ignorePseudoElements\":[\"ng-deep\"]}]");
+  }
+
+  @Test
+  public void selector_pseudo_element_no_unknown_custom() {
+    SelectorPseudoElementNoUnknown selectorPseudoElementNoUnknown = new SelectorPseudoElementNoUnknown();
+    selectorPseudoElementNoUnknown.ignorePseudoElements =  "ng-deep, /^custom-/";
+    String optionsAsJson = new Gson().toJson(selectorPseudoElementNoUnknown.stylelintOptions());
+    assertThat(optionsAsJson).isEqualTo("[true,{\"ignorePseudoElements\":[\"ng-deep\",\"/^custom-/\"]}]");
+  }
+
+  @Test
   public void units_no_unknown_options() {
     String optionsAsJson = new Gson().toJson(new UnitNoUnknown().stylelintOptions());
     assertThat(optionsAsJson).isEqualTo("[true,{\"ignoreUnits\":[\"x\"]}]");