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use {
anyhow::Result,
regex_automata::{
meta::{self, Regex},
util::syntax,
MatchKind, PatternSet,
},
regex_test::{
CompiledRegex, Match, RegexTest, SearchKind, Span, TestResult,
TestRunner,
},
};
use crate::{create_input, suite, testify_captures};
const BLACKLIST: &[&str] = &[
// These 'earliest' tests are blacklisted because the meta searcher doesn't
// give the same offsets that the test expects. This is legal because the
// 'earliest' routines don't guarantee a particular match offset other
// than "the earliest the regex engine can report a match." Some regex
// engines will quit earlier than others. The backtracker, for example,
// can't really quit before finding the full leftmost-first match. Many of
// the literal searchers also don't have the ability to quit fully or it's
// otherwise not worth doing. (A literal searcher not quitting as early as
// possible usually means looking at a few more bytes. That's no biggie.)
"earliest/",
];
/// Tests the default configuration of the meta regex engine.
#[test]
fn default() -> Result<()> {
let builder = Regex::builder();
let mut runner = TestRunner::new()?;
runner
.expand(&["is_match", "find", "captures"], |test| test.compiles())
.blacklist_iter(BLACKLIST)
.test_iter(suite()?.iter(), compiler(builder))
.assert();
Ok(())
}
/// Tests the default configuration minus the full DFA.
#[test]
fn no_dfa() -> Result<()> {
let mut builder = Regex::builder();
builder.configure(Regex::config().dfa(false));
let mut runner = TestRunner::new()?;
runner
.expand(&["is_match", "find", "captures"], |test| test.compiles())
.blacklist_iter(BLACKLIST)
.test_iter(suite()?.iter(), compiler(builder))
.assert();
Ok(())
}
/// Tests the default configuration minus the full DFA and lazy DFA.
#[test]
fn no_dfa_hybrid() -> Result<()> {
let mut builder = Regex::builder();
builder.configure(Regex::config().dfa(false).hybrid(false));
let mut runner = TestRunner::new()?;
runner
.expand(&["is_match", "find", "captures"], |test| test.compiles())
.blacklist_iter(BLACKLIST)
.test_iter(suite()?.iter(), compiler(builder))
.assert();
Ok(())
}
/// Tests the default configuration minus the full DFA, lazy DFA and one-pass
/// DFA.
#[test]
fn no_dfa_hybrid_onepass() -> Result<()> {
let mut builder = Regex::builder();
builder.configure(Regex::config().dfa(false).hybrid(false).onepass(false));
let mut runner = TestRunner::new()?;
runner
.expand(&["is_match", "find", "captures"], |test| test.compiles())
.blacklist_iter(BLACKLIST)
.test_iter(suite()?.iter(), compiler(builder))
.assert();
Ok(())
}
/// Tests the default configuration minus the full DFA, lazy DFA, one-pass
/// DFA and backtracker.
#[test]
fn no_dfa_hybrid_onepass_backtrack() -> Result<()> {
let mut builder = Regex::builder();
builder.configure(
Regex::config()
.dfa(false)
.hybrid(false)
.onepass(false)
.backtrack(false),
);
let mut runner = TestRunner::new()?;
runner
.expand(&["is_match", "find", "captures"], |test| test.compiles())
.blacklist_iter(BLACKLIST)
.test_iter(suite()?.iter(), compiler(builder))
.assert();
Ok(())
}
fn compiler(
mut builder: meta::Builder,
) -> impl FnMut(&RegexTest, &[String]) -> Result<CompiledRegex> {
move |test, regexes| {
if !configure_meta_builder(test, &mut builder) {
return Ok(CompiledRegex::skip());
}
let re = builder.build_many(®exes)?;
Ok(CompiledRegex::compiled(move |test| -> TestResult {
run_test(&re, test)
}))
}
}
fn run_test(re: &Regex, test: &RegexTest) -> TestResult {
let input = create_input(test);
match test.additional_name() {
"is_match" => TestResult::matched(re.is_match(input)),
"find" => match test.search_kind() {
SearchKind::Earliest => TestResult::matches(
re.find_iter(input.earliest(true))
.take(test.match_limit().unwrap_or(std::usize::MAX))
.map(|m| Match {
id: m.pattern().as_usize(),
span: Span { start: m.start(), end: m.end() },
}),
),
SearchKind::Leftmost => TestResult::matches(
re.find_iter(input)
.take(test.match_limit().unwrap_or(std::usize::MAX))
.map(|m| Match {
id: m.pattern().as_usize(),
span: Span { start: m.start(), end: m.end() },
}),
),
SearchKind::Overlapping => {
let mut patset = PatternSet::new(re.pattern_len());
re.which_overlapping_matches(&input, &mut patset);
TestResult::which(patset.iter().map(|p| p.as_usize()))
}
},
"captures" => match test.search_kind() {
SearchKind::Earliest => {
let it = re
.captures_iter(input.earliest(true))
.take(test.match_limit().unwrap_or(std::usize::MAX))
.map(|caps| testify_captures(&caps));
TestResult::captures(it)
}
SearchKind::Leftmost => {
let it = re
.captures_iter(input)
.take(test.match_limit().unwrap_or(std::usize::MAX))
.map(|caps| testify_captures(&caps));
TestResult::captures(it)
}
SearchKind::Overlapping => {
// There is no overlapping regex API that supports captures.
TestResult::skip()
}
},
name => TestResult::fail(&format!("unrecognized test name: {}", name)),
}
}
/// Configures the given regex builder with all relevant settings on the given
/// regex test.
///
/// If the regex test has a setting that is unsupported, then this returns
/// false (implying the test should be skipped).
fn configure_meta_builder(
test: &RegexTest,
builder: &mut meta::Builder,
) -> bool {
let match_kind = match test.match_kind() {
regex_test::MatchKind::All => MatchKind::All,
regex_test::MatchKind::LeftmostFirst => MatchKind::LeftmostFirst,
regex_test::MatchKind::LeftmostLongest => return false,
};
let meta_config = Regex::config()
.match_kind(match_kind)
.utf8_empty(test.utf8())
.line_terminator(test.line_terminator());
builder.configure(meta_config).syntax(config_syntax(test));
true
}
/// Configuration of the regex parser from a regex test.
fn config_syntax(test: &RegexTest) -> syntax::Config {
syntax::Config::new()
.case_insensitive(test.case_insensitive())
.unicode(test.unicode())
.utf8(test.utf8())
.line_terminator(test.line_terminator())
}
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