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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<CompiledRegex> {
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()
}