[njs] Parser: fixed return statement parsing with invalid expression.

[Dmitry Volyntsev]

details:   https://hg.nginx.org/njs/rev/c081cc5377a8
branches:  
changeset: 2224:c081cc5377a8
user:      Vadim Zhestikov <v.zhestikov at f5.com>
date:      Mon Oct 23 21:19:03 2023 -0700
description:
Parser: fixed return statement parsing with invalid expression.

diffstat:

 src/njs_parser.c         |  15 +++++++++------
 src/test/njs_unit_test.c |   9 +++++++++
 2 files changed, 18 insertions(+), 6 deletions(-)

diffs (51 lines):

diff -r d83c6616f2b1 -r c081cc5377a8 src/njs_parser.c
--- a/src/njs_parser.c	Fri Oct 20 08:44:52 2023 -0700
+++ b/src/njs_parser.c	Mon Oct 23 21:19:03 2023 -0700
@@ -6347,10 +6347,12 @@ njs_parser_return_statement(njs_parser_t
 
         parser->node = NULL;
 
-        njs_parser_next(parser, njs_parser_expression);
-
-        return njs_parser_after(parser, current, node, 0,
-                                njs_parser_return_statement_after);
+        if (token->type != NJS_TOKEN_CLOSE_BRACE) {
+            njs_parser_next(parser, njs_parser_expression);
+
+            return njs_parser_after(parser, current, node, 0,
+                                    njs_parser_return_statement_after);
+        }
     }
 
     parser->node = node;
@@ -6364,8 +6366,9 @@ njs_parser_return_statement_after(njs_pa
     njs_lexer_token_t *token, njs_queue_link_t *current)
 {
     if (parser->ret != NJS_OK) {
-        parser->node = parser->target;
-        return njs_parser_stack_pop(parser);
+        njs_parser_syntax_error(parser, "Unexpected token \"%V\"",
+                                &token->text);
+        return NJS_DONE;
     }
 
     if (njs_parser_expect_semicolon(parser, token) != NJS_OK) {
diff -r d83c6616f2b1 -r c081cc5377a8 src/test/njs_unit_test.c
--- a/src/test/njs_unit_test.c	Fri Oct 20 08:44:52 2023 -0700
+++ b/src/test/njs_unit_test.c	Mon Oct 23 21:19:03 2023 -0700
@@ -10093,6 +10093,15 @@ static njs_unit_test_t  njs_test[] =
     { njs_str("\n{\nreturn;\n}"),
       njs_str("SyntaxError: Illegal return statement in 3") },
 
+    { njs_str("function f () {return a +}"),
+      njs_str("SyntaxError: Unexpected token \"}\" in 1") },
+
+    { njs_str("`${function(){return n=>}}`"),
+      njs_str("SyntaxError: Unexpected token \"}\" in 1") },
+
+    { njs_str("(function(){return a +})"),
+      njs_str("SyntaxError: Unexpected token \"}\" in 1") },
+
     { njs_str("if (1) function f(){}"),
       njs_str("SyntaxError: Functions can only be declared at top level or inside a block in 1") },