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"""Tests that exercise every element kind through the subexpression merge path.
Each subexpression is built with one particular element kind and merged
into a parent; the resulting regex string is asserted byte-for-byte so the
per-type branches in :mod:`edify.builder.merge` all get exercised.
"""
from edify import RegexBuilder
def _merge(sub: RegexBuilder) -> str:
return RegexBuilder().subexpression(sub).to_regex_string()
def test_subexpression_with_capture():
sub = RegexBuilder().capture().digit().end()
assert _merge(sub) == "(\\d)"
def test_subexpression_with_named_capture():
sub = RegexBuilder().named_capture("token").digit().end()
assert _merge(sub) == "(?P<token>\\d)"
def test_subexpression_with_back_reference():
sub = RegexBuilder().capture().digit().end().back_reference(1)
assert _merge(sub) == "(\\d)\\1"
def test_subexpression_with_named_back_reference():
sub = RegexBuilder().named_capture("token").digit().end().named_back_reference("token")
assert _merge(sub) == "(?P<token>\\d)(?P=token)"
def test_subexpression_with_group():
sub = RegexBuilder().group().digit().end()
assert _merge(sub) == "(?:\\d)"
def test_subexpression_with_any_of():
sub = RegexBuilder().any_of().char("a").char("b").end()
assert _merge(sub) == "[ab]"
def test_subexpression_with_nested_subexpression():
inner = RegexBuilder().digit()
middle = RegexBuilder().subexpression(inner)
assert _merge(middle) == "\\d"
def test_subexpression_with_assert_ahead():
sub = RegexBuilder().assert_ahead().digit().end()
assert _merge(sub) == "(?=\\d)"
def test_subexpression_with_assert_not_ahead():
sub = RegexBuilder().assert_not_ahead().digit().end()
assert _merge(sub) == "(?!\\d)"
def test_subexpression_with_assert_behind():
sub = RegexBuilder().assert_behind().digit().end()
assert _merge(sub) == "(?<=\\d)"
def test_subexpression_with_assert_not_behind():
sub = RegexBuilder().assert_not_behind().digit().end()
assert _merge(sub) == "(?<!\\d)"
def test_subexpression_with_optional():
sub = RegexBuilder().optional().digit()
assert _merge(sub) == "\\d?"
def test_subexpression_with_zero_or_more():
sub = RegexBuilder().zero_or_more().digit()
assert _merge(sub) == "\\d*"
def test_subexpression_with_zero_or_more_lazy():
sub = RegexBuilder().zero_or_more_lazy().digit()
assert _merge(sub) == "\\d*?"
def test_subexpression_with_one_or_more():
sub = RegexBuilder().one_or_more().digit()
assert _merge(sub) == "\\d+"
def test_subexpression_with_one_or_more_lazy():
sub = RegexBuilder().one_or_more_lazy().digit()
assert _merge(sub) == "\\d+?"
def test_subexpression_with_exactly():
sub = RegexBuilder().exactly(3).digit()
assert _merge(sub) == "\\d{3}"
def test_subexpression_with_at_least():
sub = RegexBuilder().at_least(2).digit()
assert _merge(sub) == "\\d{2,}"
def test_subexpression_with_between():
sub = RegexBuilder().between(1, 4).digit()
assert _merge(sub) == "\\d{1,4}"
def test_subexpression_with_between_lazy():
sub = RegexBuilder().between_lazy(1, 4).digit()
assert _merge(sub) == "\\d{1,4}?"
def test_subexpression_with_start_of_input_collapses_to_noop():
sub = RegexBuilder().start_of_input().digit()
assert _merge(sub) == "\\d"
def test_subexpression_with_end_of_input_collapses_to_noop():
sub = RegexBuilder().digit().end_of_input()
assert _merge(sub) == "\\d"
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