enhance: オブジェクトリテラルのキーに文字列を書けるように

src/parser/syntaxes/expressions.ts

@@ -565,7 +565,10 @@ function parseObject(s: ITokenStream, isStatic: boolean): Ast.Obj {
 
 	const map = new Map<string, Ast.Expression>();
 	while (!s.is(TokenKind.CloseBrace)) {
-		s.expect(TokenKind.Identifier);
+		const keyTokenKind = s.getTokenKind();
+		if (keyTokenKind !== TokenKind.Identifier && keyTokenKind !== TokenKind.StringLiteral) {
+			throw unexpectedTokenError(keyTokenKind, s.getPos());
+		}
 		const k = s.getTokenValue();
 		s.next();
 

test/index.ts

@@ -198,6 +198,8 @@ describe('Object', () => {
 	});
 
 	/* 未実装
+	 * see also: test/literals.ts > literal > obj (string key)
+	 * issue: https://github.com/aiscript-dev/aiscript/issues/62
 	test.concurrent('string key', async () => {
 		const res = await exe(`
 		let obj = {

test/literals.ts

@@ -130,6 +130,15 @@ describe('literal', () => {
 		eq(res, OBJ(new Map([['a', NUM(1)], ['b', NUM(2)], ['c', NUM(3)]])));
 	});
 
+	test.concurrent('obj (string key)', async () => {
+		const res = await exe(`
+		<: {
+			"藍": 42,
+		}
+		`);
+		eq(res, OBJ(new Map([['藍', NUM(42)]])));
+	});
+
 	test.concurrent('obj and arr (separated by line break)', async () => {
 		const res = await exe(`
 		<: {

unreleased/object-key-string.md

@@ -0,0 +1 @@
+- オブジェクトリテラルのキーに文字列リテラルを記述できるようになりました。