use { anyhow::Result, regex::{Regex, RegexBuilder}, regex_test::{ CompiledRegex, Match, RegexTest, Span, TestResult, TestRunner, }, }; /// Tests the default configuration of the hybrid NFA/DFA. #[test] fn default() -> Result<()> { let mut runner = TestRunner::new()?; runner .expand(&["is_match", "find", "captures"], |test| test.compiles()) .blacklist_iter(super::BLACKLIST) .test_iter(crate::suite()?.iter(), compiler) .assert(); Ok(()) } fn run_test(re: &Regex, test: &RegexTest) -> TestResult { let hay = match std::str::from_utf8(test.haystack()) { Ok(hay) => hay, Err(err) => { return TestResult::fail(&format!( "haystack is not valid UTF-8: {}", err )); } }; match test.additional_name() { "is_match" => TestResult::matched(re.is_match(hay)), "find" => TestResult::matches( re.find_iter(hay) .take(test.match_limit().unwrap_or(std::usize::MAX)) .map(|m| Match { id: 0, span: Span { start: m.start(), end: m.end() }, }), ), "captures" => { let it = re .captures_iter(hay) .take(test.match_limit().unwrap_or(std::usize::MAX)) .map(|caps| testify_captures(&caps)); TestResult::captures(it) } name => TestResult::fail(&format!("unrecognized test name: {}", name)), } } /// Converts the given regex test to a closure that searches with a /// `bytes::Regex`. If the test configuration is unsupported, then a /// `CompiledRegex` that skips the test is returned. fn compiler( test: &RegexTest, _patterns: &[String], ) -> anyhow::Result { let skip = Ok(CompiledRegex::skip()); // We're only testing bytes::Regex here, which supports one pattern only. let pattern = match test.regexes().len() { 1 => &test.regexes()[0], _ => return skip, }; // We only test is_match, find_iter and captures_iter. All of those are // leftmost searches. if !matches!(test.search_kind(), regex_test::SearchKind::Leftmost) { return skip; } // The top-level single-pattern regex API always uses leftmost-first. if !matches!(test.match_kind(), regex_test::MatchKind::LeftmostFirst) { return skip; } // The top-level regex API always runs unanchored searches. ... But we can // handle tests that are anchored but have only one match. if test.anchored() && test.match_limit() != Some(1) { return skip; } // We don't support tests with explicit search bounds. We could probably // support this by using the 'find_at' (and such) APIs. let bounds = test.bounds(); if !(bounds.start == 0 && bounds.end == test.haystack().len()) { return skip; } // The Regex API specifically does not support disabling UTF-8 mode because // it can only search &str which is always valid UTF-8. if !test.utf8() { return skip; } // If the test requires Unicode but the Unicode feature isn't enabled, // skip it. This is a little aggressive, but the test suite doesn't // have any easy way of communicating which Unicode features are needed. if test.unicode() && !cfg!(feature = "unicode") { return skip; } let re = RegexBuilder::new(pattern) .case_insensitive(test.case_insensitive()) .unicode(test.unicode()) .line_terminator(test.line_terminator()) .build()?; Ok(CompiledRegex::compiled(move |test| run_test(&re, test))) } /// Convert `Captures` into the test suite's capture values. fn testify_captures(caps: ®ex::Captures<'_>) -> regex_test::Captures { let spans = caps.iter().map(|group| { group.map(|m| regex_test::Span { start: m.start(), end: m.end() }) }); // This unwrap is OK because we assume our 'caps' represents a match, and // a match always gives a non-zero number of groups with the first group // being non-None. regex_test::Captures::new(0, spans).unwrap() }