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bpo-40267: Fix message when last input character produces a SyntaxError (GH-19521)

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When there is a SyntaxError after reading the last input character from
the tokenizer and if no newline follows it, the error message used to be
`unexpected EOF while parsing`, which is wrong.
This commit is contained in:
Lysandros Nikolaou 2020-04-15 21:22:10 +03:00 • committed by GitHub
parent 574547a75c
commit 9a4b38f66b
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GPG key ID: 4AEE18F83AFDEB23
5 changed files with 13 additions and 1 deletions
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4
Include/token.h generated
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@ -78,6 +78,10 @@ extern "C" {
#define ISTERMINAL(x) ((x) < NT_OFFSET)
#define ISNONTERMINAL(x) ((x) >= NT_OFFSET)
#define ISEOF(x) ((x) == ENDMARKER)
#define ISWHITESPACE(x) ((x) == ENDMARKER || \
(x) == NEWLINE || \
(x) == INDENT || \
(x) == DEDENT)
PyAPI_DATA(const char * const) _PyParser_TokenNames[]; /* Token names */

2
Lib/test/test_fstring.py
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@ -713,7 +713,7 @@ def test_lambda(self):
# lambda doesn't work without parens, because the colon
# makes the parser think it's a format_spec
self.assertAllRaise(SyntaxError, 'unexpected EOF while parsing',
self.assertAllRaise(SyntaxError, 'invalid syntax',
["f'{lambda x:x}'",
])

1
Misc/NEWS.d/next/Core and Builtins/2020-04-14-18-54-50.bpo-40267.Q2N6Bw.rst Normal file
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@ -0,0 +1 @@
Fix the tokenizer to display the correct error message, when there is a SyntaxError on the last input character and no newline follows. It used to be `unexpected EOF while parsing`, while it should be `invalid syntax`.

3
Parser/parsetok.c
View file

@ -332,6 +332,9 @@ parsetok(struct tok_state *tok, grammar *g, int start, perrdetail *err_ret,
PyParser_AddToken(ps, (int)type, str,
lineno, col_offset, tok->lineno, end_col_offset,
&(err_ret->expected))) != E_OK) {
if (tok->done == E_EOF && !ISWHITESPACE(type)) {
tok->done = E_SYNTAX;
}
if (err_ret->error != E_DONE) {
PyObject_FREE(str);
err_ret->token = type;

4
Tools/scripts/generate_token.py
View file

@ -69,6 +69,10 @@ def update_file(file, content):
#define ISTERMINAL(x) ((x) < NT_OFFSET)
#define ISNONTERMINAL(x) ((x) >= NT_OFFSET)
#define ISEOF(x) ((x) == ENDMARKER)
#define ISWHITESPACE(x) ((x) == ENDMARKER || \\
(x) == NEWLINE || \\
(x) == INDENT || \\
(x) == DEDENT)
PyAPI_DATA(const char * const) _PyParser_TokenNames[]; /* Token names */