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bpo-40847: Consider a line with only a LINECONT a blank line (GH-20769)

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A line with only a line continuation character should be considered
a blank line at tokenizer level so that only a single NEWLINE token
gets emitted. The old parser was working around the issue, but the
new parser threw a `SyntaxError` for valid input. For example,
an empty line following a line continuation character was interpreted
as a `SyntaxError`.

Co-authored-by: Pablo Galindo <Pablogsal@gmail.com>
This commit is contained in:
Lysandros Nikolaou 2020-06-11 02:56:08 +03:00 • committed by GitHub
parent 7f888c7ef9
commit 896f4cf63f
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4 changed files with 27 additions and 1 deletions
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Parser/tokenizer.c
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@ -1203,8 +1203,9 @@ tok_get(struct tok_state *tok, const char **p_start, const char **p_end)
}
}
tok_backup(tok, c);
if (c == '#' || c == '\n') {
if (c == '#' || c == '\n' || c == '\\') {
/* Lines with only whitespace and/or comments
and/or a line continuation character
shouldn't affect the indentation and are
not passed to the parser as NEWLINE tokens,
except *totally* empty lines in interactive