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bpo-42997: Improve error message for missing : before suites (GH-24292)

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* Add to the peg generator a new directive ('&&') that allows to expect
  a token and hard fail the parsing if the token is not found. This
  allows to quickly emmit syntax errors for missing tokens.

* Use the new grammar element to hard-fail if the ':' is missing before
  suites.
This commit is contained in:
Pablo Galindo 2021-02-02 19:54:22 +00:00 • committed by GitHub
parent 802b645e81
commit 58fb156edd
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11 changed files with 1219 additions and 428 deletions
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6
Doc/tools/extensions/peg_highlight.py
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@ -27,6 +27,12 @@ class PEGLexer(RegexLexer):
tokens = {
"ws": [(r"\n", Text), (r"\s+", Text), (r"#.*$", Comment.Singleline),],
"lookaheads": [
# Forced tokens
(r"(&&)(?=\w+\s?)", bygroups(None)),
(r"(&&)(?='.+'\s?)", bygroups(None)),
(r'(&&)(?=".+"\s?)', bygroups(None)),
(r"(&&)(?=\(.+\)\s?)", bygroups(None)),
(r"(?<=\|\s)(&\w+\s?)", bygroups(None)),
(r"(?<=\|\s)(&'.+'\s?)", bygroups(None)),
(r'(?<=\|\s)(&".+"\s?)', bygroups(None)),