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| author | Pablo Galindo <Pablogsal@gmail.com> | 2021-02-02 19:54:22 +0000 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2021-02-02 19:54:22 +0000 |
| commit | 58fb156edda1a0e924a38bfed494bd06cb09c9a3 (patch) | |
| tree | 6d09348120225209479d011aa83be95d488e3380 /Doc/tools/extensions/peg_highlight.py | |
| parent | 802b645e81a72399a7ef47ef000d468c775dcd3e (diff) | |
| download | cpython-git-58fb156edda1a0e924a38bfed494bd06cb09c9a3.tar.gz | |
bpo-42997: Improve error message for missing : before suites (GH-24292)
* 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.
Diffstat (limited to 'Doc/tools/extensions/peg_highlight.py')
| -rw-r--r-- | Doc/tools/extensions/peg_highlight.py | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Doc/tools/extensions/peg_highlight.py b/Doc/tools/extensions/peg_highlight.py index 9a2acb7f32..4ade1bfeaa 100644 --- a/Doc/tools/extensions/peg_highlight.py +++ b/Doc/tools/extensions/peg_highlight.py @@ -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)), |