CSS: Fixed @-rules not accounting for strings (#3438)

components/prism-css.js

@@ -5,7 +5,7 @@
 	Prism.languages.css = {
 		'comment': /\/\*[\s\S]*?\*\//,
 		'atrule': {
-			pattern: /@[\w-](?:[^;{\s]|\s+(?![\s{]))*(?:;|(?=\s*\{))/,
+			pattern: RegExp('@[\\w-](?:' + /[^;{\s"']|\s+(?!\s)/.source + '|' + string.source + ')*?' + /(?:;|(?=\s*\{))/.source),
 			inside: {
 				'rule': /^@[\w-]+/,
 				'selector-function-argument': {

prism.js

@@ -1468,7 +1468,7 @@ Prism.languages.rss = Prism.languages.xml;
 	Prism.languages.css = {
 		'comment': /\/\*[\s\S]*?\*\//,
 		'atrule': {
-			pattern: /@[\w-](?:[^;{\s]|\s+(?![\s{]))*(?:;|(?=\s*\{))/,
+			pattern: RegExp('@[\\w-](?:' + /[^;{\s"']|\s+(?!\s)/.source + '|' + string.source + ')*?' + /(?:;|(?=\s*\{))/.source),
 			inside: {
 				'rule': /^@[\w-]+/,
 				'selector-function-argument': {

tests/languages/css/atrule_feature.test

@@ -4,6 +4,7 @@
 @supports (top: 50vmax)
 	or (top: 50vw) {}
 @main-color: red;
+@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');
 
 ----------------------------------------------------
 
@@ -18,12 +19,14 @@
 		]],
 		["punctuation", ";"]
 	]],
+
 	["atrule", [
 		["rule", "@media"],
 		" print"
 	]],
 	["punctuation", "{"],
 	["punctuation", "}"],
+
 	["atrule", [
 		["rule", "@media"],
 		["punctuation", "("],
@@ -40,13 +43,15 @@
 	]],
 	["punctuation", "{"],
 	["punctuation", "}"],
+
 	["atrule", [
 		["rule", "@supports"],
 		["punctuation", "("],
 		["property", "top"],
 		["punctuation", ":"],
 		" 50vmax",
 		["punctuation", ")"],
+
 		["keyword", "or"],
 		["punctuation", "("],
 		["property", "top"],
@@ -56,11 +61,23 @@
 	]],
 	["punctuation", "{"],
 	["punctuation", "}"],
+
 	["atrule", [
 		["rule", "@main-color"],
 		["punctuation", ":"],
 		" red",
 		["punctuation", ";"]
+	]],
+
+	["atrule", [
+		["rule", "@import"],
+		["url", [
+			["function", "url"],
+			["punctuation", "("],
+			["string", "'https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap'"],
+			["punctuation", ")"]
+		]],
+		["punctuation", ";"]
 	]]
 ]