Fix selector-anb-no-unmatchable performance

lib/rules/selector-anb-no-unmatchable/index.js

@@ -10,6 +10,7 @@ const isStandardSyntaxRule = require('../../utils/isStandardSyntaxRule');
 const report = require('../../utils/report');
 const ruleMessages = require('../../utils/ruleMessages');
 const validateOptions = require('../../utils/validateOptions');
+const hasANPlusBNotationPseudoClasses = require('../../utils/hasANPlusBNotationPseudoClasses');
 
 const ruleName = 'selector-anb-no-unmatchable';
 
@@ -50,6 +51,8 @@ const rule = (primary) => {
 			}
 
 			ruleNode.selectors.forEach((selector) => {
+				if (!hasANPlusBNotationPseudoClasses(selector)) return;
+
 				let cssTreeSelector;
 
 				try {

lib/utils/hasANPlusBNotationPseudoClasses.js

@@ -0,0 +1,24 @@
+'use strict';
+
+const {
+	aNPlusBNotationPseudoClasses,
+	aNPlusBOfSNotationPseudoClasses,
+} = require('../reference/selectors');
+
+const HAS_A_N_PLUS_B_NOTATION_PSEUDO_CLASSES = new RegExp(
+	`\\b:(?:${[
+		...aNPlusBNotationPseudoClasses.values(),
+		...aNPlusBOfSNotationPseudoClasses.values(),
+	].join('|')})\\(`,
+	'i',
+);
+
+/**
+ * Check if a selector contains any pseudo class function that might contain an An+B notation
+ *
+ * @param {string} selector
+ * @returns {boolean}
+ */
+module.exports = function hasANPlusBNotationPseudoClasses(selector) {
+	return HAS_A_N_PLUS_B_NOTATION_PSEUDO_CLASSES.test(selector);
+};