build(rust): vendor googletest crate

third_party/crates/regex-1.13.1/tests/suite_string_set.rs

@@ -0,0 +1,78 @@
+use {
+    anyhow::Result,
+    regex::{RegexSet, RegexSetBuilder},
+    regex_test::{CompiledRegex, RegexTest, TestResult, TestRunner},
+};
+
+/// Tests the default configuration of the hybrid NFA/DFA.
+#[test]
+fn default() -> Result<()> {
+    let mut runner = TestRunner::new()?;
+    runner
+        .expand(&["is_match", "which"], |test| test.compiles())
+        .blacklist_iter(super::BLACKLIST)
+        .test_iter(crate::suite()?.iter(), compiler)
+        .assert();
+    Ok(())
+}
+
+fn run_test(re: &RegexSet, 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)),
+        "which" => TestResult::which(re.matches(hay).iter()),
+        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());
+
+    // The top-level RegexSet API only supports "overlapping" semantics.
+    if !matches!(test.search_kind(), regex_test::SearchKind::Overlapping) {
+        return skip;
+    }
+    // The top-level RegexSet API only supports "all" semantics.
+    if !matches!(test.match_kind(), regex_test::MatchKind::All) {
+        return skip;
+    }
+    // The top-level RegexSet API always runs unanchored searches.
+    if test.anchored() {
+        return skip;
+    }
+    // We don't support tests with explicit search bounds.
+    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 = RegexSetBuilder::new(test.regexes())
+        .case_insensitive(test.case_insensitive())
+        .unicode(test.unicode())
+        .line_terminator(test.line_terminator())
+        .build()?;
+    Ok(CompiledRegex::compiled(move |test| run_test(&re, test)))
+}