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gh-133555: Allow to regenerate the parser with Python < 3.14 #133557

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Merged
merged 5 commits into from
May 8, 2025
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gh-133555: Allow to regenerate the parser with Python < 3.14 #133557

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f56a805
gh-133555: allow to regenerate the parser with Python < 3.14
alexprengere May 7, 2025
bc0ffe8
Update Tools/peg_generator/pegen/parser_generator.py
alexprengere May 7, 2025
5043a30
Add comment regarding updating the peg generator when adding tokens
alexprengere May 7, 2025
e336531
Update Grammar/Tokens
alexprengere May 7, 2025
68066fd
Update Grammar/Tokens
alexprengere May 7, 2025
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5 changes: 5 additions & 0 deletions Grammar/Tokens
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Original file line number Diff line number Diff line change
@@ -1,3 +1,8 @@
# When adding new tokens, remember to update the PEG generator in
# Tools/peg_generator/pegen/parser_generator.py
# This will ensure that older versions of Python can generate a Python parser
# using "python -m pegen python <GRAMMAR FILE>".

ENDMARKER
NAME
NUMBER
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5 changes: 5 additions & 0 deletions Tools/peg_generator/pegen/parser_generator.py
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Expand Up @@ -81,6 +81,11 @@ def __init__(self, rules: Dict[str, Rule], tokens: Set[str]):
self.tokens.add("FSTRING_START")
self.tokens.add("FSTRING_END")
self.tokens.add("FSTRING_MIDDLE")
# If python < 3.14 add the virtual tstring tokens
if sys.version_info < (3, 14, 0, 'beta', 1):
self.tokens.add("TSTRING_START")
self.tokens.add("TSTRING_END")
self.tokens.add("TSTRING_MIDDLE")

def visit_NameLeaf(self, node: NameLeaf) -> None:
if node.value not in self.rules and node.value not in self.tokens:
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