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bpo-41044: Generate valid PEG python parsers for opt+seq rules (GH-20995)

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Co-authored-by: Pablo Galindo <Pablogsal@gmail.com>
(cherry picked from commit 55460ee6dc)

Co-authored-by: Batuhan Taskaya <isidentical@gmail.com>
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Miss Islington (bot) 2020-06-20 10:59:32 -07:00 • committed by GitHub
parent c9f83c173b
commit 9862181750
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2 changed files with 15 additions and 1 deletions
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8
Tools/peg_generator/pegen/python_generator.py
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@ -93,7 +93,13 @@ class PythonCallMakerVisitor(GrammarVisitor):
def visit_Opt(self, node: Opt) -> Tuple[str, str]:
name, call = self.visit(node.node)
return "opt", f"{call}," # Note trailing comma!
# Note trailing comma (the call may already have one comma
# at the end, for example when rules have both repeat0 and optional
# markers, e.g: [rule*])
if call.endswith(","):
return "opt", call
else:
return "opt", f"{call},"
def visit_Repeat0(self, node: Repeat0) -> Tuple[str, str]:
if node in self.cache: