diff options
| -rw-r--r-- | src/libcore/tests/pattern.rs | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/src/libcore/tests/pattern.rs b/src/libcore/tests/pattern.rs index d0fd15263b2..cfa3b7ee664 100644 --- a/src/libcore/tests/pattern.rs +++ b/src/libcore/tests/pattern.rs @@ -262,3 +262,41 @@ fn test_reverse_search_shared_bytes() { [InRange(37, 40), Rejects(34, 37), InRange(10, 13), Rejects(8, 10), Done] ); } + +#[test] +fn double_ended_regression_test() { + // https://github.com/rust-lang/rust/issues/47175 + // Ensures that double ended searching comes to a convergence + search_asserts!("abcdeabcdeabcde", 'a', "alternating double ended search", + [next_match, next_match_back, next_match, next_match_back], + [InRange(0, 1), InRange(10, 11), InRange(5, 6), Done] + ); + search_asserts!("abcdeabcdeabcde", 'a', "triple double ended search for a", + [next_match, next_match_back, next_match_back, next_match_back], + [InRange(0, 1), InRange(10, 11), InRange(5, 6), Done] + ); + search_asserts!("abcdeabcdeabcde", 'd', "triple double ended search for d", + [next_match, next_match_back, next_match_back, next_match_back], + [InRange(3, 4), InRange(13, 14), InRange(8, 9), Done] + ); + search_asserts!(STRESS, 'Ã', "Double ended search for two-byte Latin character", + [next_match, next_match_back, next_match, next_match_back], + [InRange(0, 2), InRange(32, 34), InRange(8, 10), Done] + ); + search_asserts!(STRESS, 'ę°', "Reverse double ended search for three-byte Hangul character", + [next_match_back, next_back, next_match, next, next_match_back, next_match], + [InRange(34, 37), Rejects(32, 34), InRange(19, 22), Rejects(22, 25), InRange(28, 31), Done] + ); + search_asserts!(STRESS, 'āļ', "Double ended search for three-byte Thai character", + [next_match, next_back, next, next_match_back, next_match], + [InRange(22, 25), Rejects(47, 48), Rejects(25, 28), InRange(40, 43), Done] + ); + search_asserts!(STRESS, 'ð', "Double ended search for four-byte emoji", + [next_match_back, next, next_match, next_back, next_match], + [InRange(43, 47), Rejects(0, 2), InRange(15, 19), Rejects(40, 43), Done] + ); + search_asserts!(STRESS, 'ę', "Double ended search for three-byte Yi character with repeated bytes", + [next_match, next, next_match_back, next_back, next_match], + [InRange(10, 13), Rejects(13, 14), InRange(37, 40), Rejects(34, 37), Done] + ); +} |