[3.12] pythongh-105042: Disable unmatched parens syntax error in pyth…

…on tokenize (pythonGH-105061) (python#105120)

pythongh-105042: Disable unmatched parens syntax error in python tokenize (pythonGH-105061)
(cherry picked from commit 70f315c)

Co-authored-by: Lysandros Nikolaou <lisandrosnik@gmail.com>

Lib/test/inspect_fodder.py

@@ -113,3 +113,8 @@ async def asyncf(self):
        # after asyncf - line 113
     # end of WhichComments - line 114
   # after WhichComments - line 115
+
+# Test that getsource works on a line that includes
+# a closing parenthesis with the opening paren being in another line
+(
+); after_closing = lambda: 1

Lib/test/test_inspect.py

@@ -557,7 +557,8 @@ def test_getclasses(self):
 
     def test_getfunctions(self):
         functions = inspect.getmembers(mod, inspect.isfunction)
-        self.assertEqual(functions, [('eggs', mod.eggs),
+        self.assertEqual(functions, [('after_closing', mod.after_closing),
+                                     ('eggs', mod.eggs),
                                      ('lobbest', mod.lobbest),
                                      ('spam', mod.spam)])
 
@@ -641,6 +642,7 @@ def test_getsource(self):
         self.assertSourceEqual(git.abuse, 29, 39)
         self.assertSourceEqual(mod.StupidGit, 21, 51)
         self.assertSourceEqual(mod.lobbest, 75, 76)
+        self.assertSourceEqual(mod.after_closing, 120, 120)
 
     def test_getsourcefile(self):
         self.assertEqual(normcase(inspect.getsourcefile(mod.spam)), modfile)

Lib/test/test_tokenize.py

@@ -1100,6 +1100,13 @@ def test_newline_after_parenthesized_block_with_comment(self):
     NEWLINE    '\\n'          (4, 1) (4, 2)
     """)
 
+    def test_closing_parenthesis_from_different_line(self):
+        self.check_tokenize("); x", """\
+    OP         ')'           (1, 0) (1, 1)
+    OP         ';'           (1, 1) (1, 2)
+    NAME       'x'           (1, 3) (1, 4)
+    """)
+
 class GenerateTokensTest(TokenizeTest):
     def check_tokenize(self, s, expected):
         # Format the tokens in s in a table format.

Parser/tokenizer.c

@@ -2496,41 +2496,42 @@ tok_get_normal_mode(struct tok_state *tok, tokenizer_mode* current_tok, struct t
     case ')':
     case ']':
     case '}':
-        if (!tok->level) {
-            if (INSIDE_FSTRING(tok) && !current_tok->curly_bracket_depth && c == '}') {
-                return MAKE_TOKEN(syntaxerror(tok, "f-string: single '}' is not allowed"));
-            }
+        if (INSIDE_FSTRING(tok) && !current_tok->curly_bracket_depth && c == '}') {
+            return MAKE_TOKEN(syntaxerror(tok, "f-string: single '}' is not allowed"));
+        }
+        if (!tok->tok_extra_tokens && !tok->level) {
             return MAKE_TOKEN(syntaxerror(tok, "unmatched '%c'", c));
         }
-        tok->level--;
-        int opening = tok->parenstack[tok->level];
-        if (!((opening == '(' && c == ')') ||
-              (opening == '[' && c == ']') ||
-              (opening == '{' && c == '}')))
-        {
-            /* If the opening bracket belongs to an f-string's expression
-               part (e.g. f"{)}") and the closing bracket is an arbitrary
-               nested expression, then instead of matching a different
-               syntactical construct with it; we'll throw an unmatched
-               parentheses error. */
-            if (INSIDE_FSTRING(tok) && opening == '{') {
-                assert(current_tok->curly_bracket_depth >= 0);
-                int previous_bracket = current_tok->curly_bracket_depth - 1;
-                if (previous_bracket == current_tok->curly_bracket_expr_start_depth) {
-                    return MAKE_TOKEN(syntaxerror(tok, "f-string: unmatched '%c'", c));
+        if (tok->level > 0) {
+            tok->level--;
+            int opening = tok->parenstack[tok->level];
+            if (!tok->tok_extra_tokens && !((opening == '(' && c == ')') ||
+                                            (opening == '[' && c == ']') ||
+                                            (opening == '{' && c == '}'))) {
+                /* If the opening bracket belongs to an f-string's expression
+                part (e.g. f"{)}") and the closing bracket is an arbitrary
+                nested expression, then instead of matching a different
+                syntactical construct with it; we'll throw an unmatched
+                parentheses error. */
+                if (INSIDE_FSTRING(tok) && opening == '{') {
+                    assert(current_tok->curly_bracket_depth >= 0);
+                    int previous_bracket = current_tok->curly_bracket_depth - 1;
+                    if (previous_bracket == current_tok->curly_bracket_expr_start_depth) {
+                        return MAKE_TOKEN(syntaxerror(tok, "f-string: unmatched '%c'", c));
+                    }
+                }
+                if (tok->parenlinenostack[tok->level] != tok->lineno) {
+                    return MAKE_TOKEN(syntaxerror(tok,
+                            "closing parenthesis '%c' does not match "
+                            "opening parenthesis '%c' on line %d",
+                            c, opening, tok->parenlinenostack[tok->level]));
+                }
+                else {
+                    return MAKE_TOKEN(syntaxerror(tok,
+                            "closing parenthesis '%c' does not match "
+                            "opening parenthesis '%c'",
+                            c, opening));
                 }
-            }
-            if (tok->parenlinenostack[tok->level] != tok->lineno) {
-                return MAKE_TOKEN(syntaxerror(tok,
-                        "closing parenthesis '%c' does not match "
-                        "opening parenthesis '%c' on line %d",
-                        c, opening, tok->parenlinenostack[tok->level]));
-            }
-            else {
-                return MAKE_TOKEN(syntaxerror(tok,
-                        "closing parenthesis '%c' does not match "
-                        "opening parenthesis '%c'",
-                        c, opening));
             }
         }
 

Python/Python-tokenize.c

@@ -82,7 +82,7 @@ _tokenizer_error(struct tok_state *tok)
             msg = "invalid token";
             break;
         case E_EOF:
-            if (tok->level) {
+            if (tok->level > 0) {
                     PyErr_Format(PyExc_SyntaxError,
                                  "parenthesis '%c' was never closed",
                                 tok->parenstack[tok->level-1]);