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"""Property — ``Pattern.from_dict(pattern.to_dict())`` roundtrips every generated pattern."""
from hypothesis import given
from hypothesis import strategies as strategy
from edify import Pattern
_LITERAL_ALPHABET = "abcdefghijklmnopqrstuvwxyz0123456789"
def _string_pattern(text: str) -> Pattern:
return Pattern().string(text)
def _any_of_chars_pattern(body: str) -> Pattern:
return Pattern().any_of_chars(body)
def _pattern_strategy() -> strategy.SearchStrategy[Pattern]:
text_strategy = strategy.text(alphabet=_LITERAL_ALPHABET, min_size=1, max_size=6)
class_body_strategy = strategy.text(alphabet=_LITERAL_ALPHABET, min_size=1, max_size=4)
leaves = strategy.one_of(
text_strategy.map(_string_pattern),
strategy.builds(lambda: Pattern().digit()),
strategy.builds(lambda: Pattern().word()),
strategy.builds(lambda: Pattern().letter()),
class_body_strategy.map(_any_of_chars_pattern),
)
return strategy.recursive(
leaves,
lambda children: strategy.one_of(
children.map(_wrap_in_capture),
children.map(_wrap_in_group),
children.map(_wrap_in_one_or_more),
children.map(_wrap_in_optional),
),
max_leaves=4,
)
def _wrap_in_capture(inner: Pattern) -> Pattern:
return Pattern().capture().subexpression(inner).end()
def _wrap_in_group(inner: Pattern) -> Pattern:
return Pattern().group().subexpression(inner).end()
def _wrap_in_one_or_more(inner: Pattern) -> Pattern:
return Pattern().one_or_more().subexpression(inner)
def _wrap_in_optional(inner: Pattern) -> Pattern:
return Pattern().optional().subexpression(inner)
@given(_pattern_strategy())
def test_dict_roundtrip_preserves_the_emitted_regex_string(original_pattern: Pattern):
document = original_pattern.to_dict()
reconstructed_pattern = Pattern.from_dict(document)
assert reconstructed_pattern.to_regex_string() == original_pattern.to_regex_string()
@given(_pattern_strategy())
def test_json_roundtrip_preserves_the_emitted_regex_string(original_pattern: Pattern):
payload = original_pattern.to_json()
reconstructed_pattern = Pattern.from_json(payload)
assert reconstructed_pattern.to_regex_string() == original_pattern.to_regex_string()
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