From b8e53176d42b496f84eaa520d9067c87e9080469 Mon Sep 17 00:00:00 2001
From: Romain Menke <11521496+romainmenke@users.noreply.github.com>
Date: Tue, 4 Jul 2023 14:42:17 +0200
Subject: [PATCH] Fix `selector-type-case` performance (#7041)

* Fix `selector-type-case` performance

* Create friendly-candles-deny.md

* update STARTS_A_TAG_NAME_REGEX

Co-authored-by: Masafumi Koba <473530+ybiquitous@users.noreply.github.com>

---------

Co-authored-by: Masafumi Koba <473530+ybiquitous@users.noreply.github.com>
---
 .changeset/friendly-candles-deny.md         |  5 +++++
 lib/rules/selector-type-case/index.js       | 17 +++++++++++++----
 lib/rules/selector-type-no-unknown/index.js |  2 +-
 3 files changed, 19 insertions(+), 5 deletions(-)
 create mode 100644 .changeset/friendly-candles-deny.md

diff --git a/.changeset/friendly-candles-deny.md b/.changeset/friendly-candles-deny.md
new file mode 100644
index 0000000000..60973810d9
--- /dev/null
+++ b/.changeset/friendly-candles-deny.md
@@ -0,0 +1,5 @@
+---
+"stylelint": patch
+---
+
+Fixed: `selector-type-case` performance
diff --git a/lib/rules/selector-type-case/index.js b/lib/rules/selector-type-case/index.js
index c2fae483d6..58aa4c7e78 100644
--- a/lib/rules/selector-type-case/index.js
+++ b/lib/rules/selector-type-case/index.js
@@ -22,6 +22,10 @@ const meta = {
 	fixable: true,
 };
 
+const STARTS_A_TAG_NAME_REGEX = /(?:[^.#[:a-zA-Z-]|^)[a-zA-Z]/;
+const ANY_UPPER_CASE_REGEX = /[A-Z]/;
+const ANY_LOWER_CASE_REGEX = /[a-z]/;
+
 /** @type {import('stylelint').Rule} */
 const rule = (primary, secondaryOptions, context) => {
 	return (root, result) => {
@@ -48,11 +52,16 @@ const rule = (primary, secondaryOptions, context) => {
 		root.walkRules((ruleNode) => {
 			let hasComments = ruleNode.raws.selector && ruleNode.raws.selector.raw;
 			const selector = hasComments ? hasComments : ruleNode.selector;
-			const selectors = ruleNode.selectors;
 
-			if (!isStandardSyntaxRule(ruleNode)) {
-				return;
-			}
+			if (!STARTS_A_TAG_NAME_REGEX.test(selector)) return;
+
+			if (primary === 'lower' && !ANY_UPPER_CASE_REGEX.test(selector)) return;
+
+			if (primary === 'upper' && !ANY_LOWER_CASE_REGEX.test(selector)) return;
+
+			if (!isStandardSyntaxRule(ruleNode)) return;
+
+			const { selectors } = ruleNode;
 
 			if (selectors.some((s) => isKeyframeSelector(s))) {
 				return;
diff --git a/lib/rules/selector-type-no-unknown/index.js b/lib/rules/selector-type-no-unknown/index.js
index bb43695772..aa157cdde5 100644
--- a/lib/rules/selector-type-no-unknown/index.js
+++ b/lib/rules/selector-type-no-unknown/index.js
@@ -24,7 +24,7 @@ const meta = {
 	url: 'https://stylelint.io/user-guide/rules/selector-type-no-unknown',
 };
 
-const STARTS_A_TAG_NAME_REGEX = /(?:[^.#[:\w-]|^)\w/;
+const STARTS_A_TAG_NAME_REGEX = /(?:[^.#[:a-zA-Z-]|^)[a-zA-Z]/;
 
 /** @type {import('stylelint').Rule} */
 const rule = (primary, secondaryOptions) => {