bpo-33306: Improve SyntaxError messages for unbalanced parentheses. (GH-6516)
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@ -1004,10 +1004,14 @@ non-important content
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self.assertEqual('{d[0]}'.format(d=d), 'integer')
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def test_invalid_expressions(self):
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self.assertAllRaise(SyntaxError, 'invalid syntax',
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[r"f'{a[4)}'",
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r"f'{a(4]}'",
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])
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self.assertAllRaise(SyntaxError,
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r"closing parenthesis '\)' does not match "
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r"opening parenthesis '\[' \(<fstring>, line 1\)",
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[r"f'{a[4)}'"])
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self.assertAllRaise(SyntaxError,
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r"closing parenthesis '\]' does not match "
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r"opening parenthesis '\(' \(<fstring>, line 1\)",
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[r"f'{a(4]}'"])
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def test_errors(self):
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# see issue 26287
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@ -133,7 +133,7 @@ class HelperFunctionsTests(unittest.TestCase):
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def test_addpackage_import_bad_syntax(self):
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# Issue 10642
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pth_dir, pth_fn = self.make_pth("import bad)syntax\n")
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pth_dir, pth_fn = self.make_pth("import bad-syntax\n")
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with captured_stderr() as err_out:
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site.addpackage(pth_dir, pth_fn, set())
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self.assertRegex(err_out.getvalue(), "line 1")
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@ -143,7 +143,7 @@ class HelperFunctionsTests(unittest.TestCase):
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# order doesn't matter. The next three could be a single check
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# but my regex foo isn't good enough to write it.
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self.assertRegex(err_out.getvalue(), 'Traceback')
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self.assertRegex(err_out.getvalue(), r'import bad\)syntax')
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self.assertRegex(err_out.getvalue(), r'import bad-syntax')
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self.assertRegex(err_out.getvalue(), 'SyntaxError')
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def test_addpackage_import_bad_exec(self):
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@ -0,0 +1 @@
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Improved syntax error messages for unbalanced parentheses.
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@ -1842,12 +1842,44 @@ tok_get(struct tok_state *tok, char **p_start, char **p_end)
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case '(':
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case '[':
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case '{':
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#ifndef PGEN
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if (tok->level >= MAXLEVEL) {
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return syntaxerror(tok, "too many nested parentheses");
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}
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tok->parenstack[tok->level] = c;
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tok->parenlinenostack[tok->level] = tok->lineno;
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#endif
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tok->level++;
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break;
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case ')':
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case ']':
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case '}':
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#ifndef PGEN
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if (!tok->level) {
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return syntaxerror(tok, "unmatched '%c'", c);
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}
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#endif
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tok->level--;
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#ifndef PGEN
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int opening = tok->parenstack[tok->level];
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if (!((opening == '(' && c == ')') ||
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(opening == '[' && c == ']') ||
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(opening == '{' && c == '}')))
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{
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if (tok->parenlinenostack[tok->level] != tok->lineno) {
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return syntaxerror(tok,
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"closing parenthesis '%c' does not match "
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"opening parenthesis '%c' on line %d",
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c, opening, tok->parenlinenostack[tok->level]);
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}
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else {
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return syntaxerror(tok,
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"closing parenthesis '%c' does not match "
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"opening parenthesis '%c'",
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c, opening);
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}
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}
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#endif
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break;
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}
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@ -11,6 +11,7 @@ extern "C" {
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#include "token.h" /* For token types */
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#define MAXINDENT 100 /* Max indentation level */
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#define MAXLEVEL 200 /* Max parentheses level */
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enum decoding_state {
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STATE_INIT,
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@ -39,14 +40,16 @@ struct tok_state {
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int lineno; /* Current line number */
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int level; /* () [] {} Parentheses nesting level */
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/* Used to allow free continuations inside them */
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/* Stuff for checking on different tab sizes */
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#ifndef PGEN
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char parenstack[MAXLEVEL];
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int parenlinenostack[MAXLEVEL];
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/* pgen doesn't have access to Python codecs, it cannot decode the input
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filename. The bytes filename might be kept, but it is only used by
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indenterror() and it is not really needed: pgen only compiles one file
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(Grammar/Grammar). */
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PyObject *filename;
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#endif
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/* Stuff for checking on different tab sizes */
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int altindstack[MAXINDENT]; /* Stack of alternate indents */
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/* Stuff for PEP 0263 */
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enum decoding_state decoding_state;
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