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"""Tests for the :class:`Pattern` composition surface."""
import pytest
from edify import Pattern, RegexBuilder
from edify.errors.input import MustBeInstanceError
def test_pattern_builds_the_same_element_tree_as_a_builder():
pattern = Pattern().between(3, 20).word()
builder = RegexBuilder().between(3, 20).word()
assert pattern._state == builder._state
def test_pattern_has_no_to_regex_terminal():
pattern = Pattern().digit()
assert not hasattr(pattern, "to_regex")
def test_pattern_has_no_to_regex_string_terminal():
pattern = Pattern().digit()
assert not hasattr(pattern, "to_regex_string")
def test_pattern_supports_nested_use_composition():
inner = Pattern().one_or_more().digit()
outer = Pattern().string("v").use(inner)
embedded = RegexBuilder().use(outer)
assert embedded.to_regex_string() == "v\\d+"
def test_subexpression_still_accepts_a_pattern():
pattern = Pattern().at_least(3).word()
embedded = RegexBuilder().subexpression(pattern)
assert embedded.to_regex_string() == "\\w{3,}"
def test_subexpression_rejects_non_builder_input():
with pytest.raises(MustBeInstanceError):
RegexBuilder().subexpression("not a pattern")
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