fix layer and container in scss (#371)

Author: aeschli

Diff for: src/parser/cssParser.ts

@@ -950,11 +950,10 @@ export class Parser {
 
 	public _parseLayerName(): nodes.Node | null {
 		// <layer-name> = <ident> [ '.' <ident> ]*
-		if (!this.peek(TokenType.Ident)) {
+		const node = this.createNode(nodes.NodeType.LayerName);
+		if (!node.addChild(this._parseIdent()) ) {
 			return null;
 		}
-		const node = this.createNode(nodes.NodeType.LayerName);
-		node.addChild(this._parseIdent());
 		while (!this.hasWhitespace() && this.acceptDelim('.')) {
 			if (this.hasWhitespace() || !node.addChild(this._parseIdent())) {
 				return this.finish(node, ParseError.IdentifierExpected);

Diff for: src/parser/cssScanner.ts

@@ -47,8 +47,8 @@ export enum TokenType {
 	Comment,
 	SingleLineComment,
 	EOF,
-	CustomToken,
-	ContainerQueryLength
+	ContainerQueryLength,
+	CustomToken // must be last token type
 }
 
 export interface IToken {

Diff for: src/test/scss/parser.test.ts

@@ -283,6 +283,16 @@ suite('SCSS - Parser', () => {
 		assertNode('@import url("override.css") layer;', parser, parser._parseStylesheet.bind(parser));
 	});
 
+	test('@layer', function () {
+		const parser = new SCSSParser();
+		assertNode('@layer #{$layer} { }', parser, parser._parseLayer.bind(parser));
+	});
+
+	test('@container', function () {
+		const parser = new SCSSParser();
+		assertNode(`@container (min-width: #{$minWidth}) { .scss-interpolation { line-height: 10cqh; } }`, parser, parser._parseStylesheet.bind(parser));
+	});
+
 	test('@use', function () {
 		const parser = new SCSSParser();
 		assertNode('@use "test"', parser, parser._parseUse.bind(parser));