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"""Tests for the ``+`` and ``|`` operators on :class:`Pattern`."""
from edify import DIGIT, END, START, WORD, Pattern
def test_plus_concatenates_two_patterns():
combined = Pattern().string("hello") + Pattern().string("world")
assert combined.to_regex_string() == "helloworld"
def test_plus_preserves_anchors_from_both_operands():
combined = START + Pattern().exactly(4).digit() + END
assert combined.to_regex_string() == "^\\d{4}$"
def test_plus_returns_a_new_pattern_and_leaves_operands_untouched():
left = Pattern().digit()
right = Pattern().word()
combined = left + right
assert combined is not left
assert combined is not right
assert left.to_regex_string() == "\\d"
assert right.to_regex_string() == "\\w"
def test_plus_using_module_constants_produces_expected_string():
combined = DIGIT + WORD
assert combined.to_regex_string() == "\\d\\w"
def test_or_produces_alternation_between_two_patterns():
combined = Pattern().string("http") | Pattern().string("https")
assert combined.to_regex_string() == "(?:http|https)"
def test_or_returns_a_new_pattern_and_leaves_operands_untouched():
left = Pattern().string("cat")
right = Pattern().string("dog")
combined = left | right
assert combined is not left
assert combined is not right
assert left.to_regex_string() == "cat"
assert right.to_regex_string() == "dog"
def test_or_chaining_produces_three_way_alternation():
combined = Pattern().string("cat") | Pattern().string("dog") | Pattern().string("fish")
assert combined.to_regex_string() == "(?:(?:cat|dog)|fish)"
def test_plus_composes_with_or_to_form_a_realistic_pattern():
scheme = Pattern().string("http") | Pattern().string("https")
combined = scheme + Pattern().string("://")
assert combined.to_regex_string() == "(?:http|https)://"
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