def test_pickle(protocol):
"""Ensure that parsers can be pickled"""
source = importlib_resources.read_text("bootpeg.grammars", "bpeg.bpeg")
parser = boot.boot_parser
for _ in range(2):
parser = pickle.loads(pickle.dumps(parser, protocol=protocol))
parser = create_parser(source, parser, actions)
def test_unparse():
"""Test that unparsing produces valid grammars"""
parser = bpeg.parse
for _ in range(3):
prev_gram = bpeg.unparse(parser)
parser = create_parser(prev_gram, parser, actions)
assert prev_gram == bpeg.unparse(parser)
def test_parse_reference():
"""Parse the PEG reference grammar"""
parse = create_parser(peg_grammar, dialect=peg)
# reference PEG does not understand results, but bootpeg requires them
parse = Parser(
Rule(parse.rules[0].name, Transform(parse.rules[0].sub_clause, "()")),
*parse.rules[1:],
)
assert parse(peg_grammar) == ()
def test_unparse():
"""Test that unparsing produces valid grammars"""
parser = peg.parse
for i in range(3):
prev_gram = peg.unparse(parser)
parser = create_parser(prev_gram, parser, {
**actions, "unescape": peg.unescape
})
# grammar is not optimal for peg when coming from bpeg
assert i == 0 or prev_gram == peg.unparse(parser)
def test_bootstrap():
source = importlib_resources.read_text("bootpeg.grammars", "bpeg.bpeg")
parser = boot.boot_parser
# ensure each parser handles itself
for _ in range(5):
parser = create_parser(source, parser, actions)
def test_not_anything():
"""Test that ``Any`` does not match after the end"""
not_anything_parse = create_parser("top:\n | a=(.) !. { (a) }\n", bpeg)
assert not_anything_parse("b") == "b"
with pytest.raises(ParseFailure):
not_anything_parse("bb")
def test_multiuse_actions(source):
"""Test that using the same capture multiple times is valid"""
multiuse_parse = create_parser("top:\n | a=(.*) { (a, a) }\n", bpeg)
result = multiuse_parse(source)
assert result == (source, source)