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[3.9] Backport GH-20370 and GH-20436: Soft keywords (GH-20458)

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Lysandros Nikolaou 2020-05-27 23:20:07 +03:00 • committed by GitHub
parent 788d7bfe18
commit 1bfe659ee5
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4 changed files with 105 additions and 6 deletions
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42
Lib/test/test_peg_generator/test_c_parser.py
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@ -402,3 +402,45 @@ class TestCParser(TempdirManager, unittest.TestCase):
parse.parse_string("a", mode=0)
"""
self.run_test(grammar_source, test_source)
def test_no_soft_keywords(self) -> None:
grammar_source = """
start: expr+ NEWLINE? ENDMARKER
expr: 'foo'
"""
grammar = parse_string(grammar_source, GrammarParser)
parser_source = generate_c_parser_source(grammar)
assert "expect_soft_keyword" not in parser_source
def test_soft_keywords(self) -> None:
grammar_source = """
start: expr+ NEWLINE? ENDMARKER
expr: "foo"
"""
grammar = parse_string(grammar_source, GrammarParser)
parser_source = generate_c_parser_source(grammar)
assert "expect_soft_keyword" in parser_source
def test_soft_keywords_parse(self) -> None:
grammar_source = """
start: "if" expr '+' expr NEWLINE
expr: NAME
"""
test_source = """
valid_cases = ["if if + if"]
invalid_cases = ["if if"]
self.check_input_strings_for_grammar(valid_cases, invalid_cases)
"""
self.run_test(grammar_source, test_source)
def test_soft_keywords_lookahead(self) -> None:
grammar_source = """
start: &"if" "if" expr '+' expr NEWLINE
expr: NAME
"""
test_source = """
valid_cases = ["if if + if"]
invalid_cases = ["if if"]
self.check_input_strings_for_grammar(valid_cases, invalid_cases)
"""
self.run_test(grammar_source, test_source)