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bpo-40334: Avoid collisions between parser variables and grammar variables #19987

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merged 2 commits into from May 10, 2020
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bpo-40334: Avoid collisions between parser variables and grammar variables #19987

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bpo-40334: Avoid collisions between parser variables and grammar vari…
pablogsal May 8, 2020
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pablogsal May 10, 2020
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27 changes: 27 additions & 0 deletions Lib/test/test_peg_generator/test_pegen.py
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Expand Up @@ -540,6 +540,33 @@ def test_missing_start(self) -> None:
with self.assertRaises(GrammarError):
parser_class = make_parser(grammar)

def test_invalid_rule_name(self) -> None:
grammar = """
start: a b
_a: 'a'
b: 'b'
"""
with self.assertRaises(GrammarError):
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parser_class = make_parser(grammar)

def test_invalid_variable_name(self) -> None:
grammar = """
start: a b
a: _x='a'
b: 'b'
"""
with self.assertRaises(GrammarError):
parser_class = make_parser(grammar)

def test_invalid_variable_name_in_temporal_rule(self) -> None:
grammar = """
start: a b
a: (_x='a' | 'b') | 'c'
b: 'b'
"""
with self.assertRaises(GrammarError):
parser_class = make_parser(grammar)


class TestGrammarVisitor:
class Visitor(GrammarVisitor):
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