From 698f8c2f01ea549d77d7dc3338a12e04c11057b9 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 17 Apr 2024 14:02:58 +0200
Subject: Adding upstream version 1.64.0+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 vendor/regex-automata/src/transducer.rs | 107 ++++++++++++++++++++++++++++++++
 1 file changed, 107 insertions(+)
 create mode 100644 vendor/regex-automata/src/transducer.rs

(limited to 'vendor/regex-automata/src/transducer.rs')

diff --git a/vendor/regex-automata/src/transducer.rs b/vendor/regex-automata/src/transducer.rs
new file mode 100644
index 000000000..679c75726
--- /dev/null
+++ b/vendor/regex-automata/src/transducer.rs
@@ -0,0 +1,107 @@
+use fst::Automaton;
+
+use crate::{StateID, DFA};
+
+macro_rules! imp {
+    ($ty:ty, $id:ty) => {
+        impl<T: AsRef<[$id]>, S: StateID> Automaton for $ty {
+            type State = S;
+
+            #[inline]
+            fn start(&self) -> S {
+                self.start_state()
+            }
+
+            #[inline]
+            fn is_match(&self, state: &S) -> bool {
+                self.is_match_state(*state)
+            }
+
+            #[inline]
+            fn accept(&self, state: &S, byte: u8) -> S {
+                self.next_state(*state, byte)
+            }
+
+            #[inline]
+            fn can_match(&self, state: &S) -> bool {
+                !self.is_dead_state(*state)
+            }
+        }
+    };
+}
+
+imp!(crate::dense::DenseDFA<T, S>, S);
+imp!(crate::dense::Standard<T, S>, S);
+imp!(crate::dense::ByteClass<T, S>, S);
+imp!(crate::dense::Premultiplied<T, S>, S);
+imp!(crate::dense::PremultipliedByteClass<T, S>, S);
+imp!(crate::sparse::SparseDFA<T, S>, u8);
+imp!(crate::sparse::Standard<T, S>, u8);
+imp!(crate::sparse::ByteClass<T, S>, u8);
+
+#[cfg(test)]
+mod tests {
+    use bstr::BString;
+    use fst::{Automaton, IntoStreamer, Set, Streamer};
+
+    use crate::dense::{self, DenseDFA};
+    use crate::sparse::SparseDFA;
+
+    fn search<A: Automaton, D: AsRef<[u8]>>(
+        set: &Set<D>,
+        aut: A,
+    ) -> Vec<BString> {
+        let mut stream = set.search(aut).into_stream();
+
+        let mut results = vec![];
+        while let Some(key) = stream.next() {
+            results.push(BString::from(key));
+        }
+        results
+    }
+
+    #[test]
+    fn dense_anywhere() {
+        let set =
+            Set::from_iter(&["a", "bar", "baz", "wat", "xba", "xbax", "z"])
+                .unwrap();
+        let dfa = DenseDFA::new("ba.*").unwrap();
+        let got = search(&set, &dfa);
+        assert_eq!(got, vec!["bar", "baz", "xba", "xbax"]);
+    }
+
+    #[test]
+    fn dense_anchored() {
+        let set =
+            Set::from_iter(&["a", "bar", "baz", "wat", "xba", "xbax", "z"])
+                .unwrap();
+        let dfa = dense::Builder::new().anchored(true).build("ba.*").unwrap();
+        let got = search(&set, &dfa);
+        assert_eq!(got, vec!["bar", "baz"]);
+    }
+
+    #[test]
+    fn sparse_anywhere() {
+        let set =
+            Set::from_iter(&["a", "bar", "baz", "wat", "xba", "xbax", "z"])
+                .unwrap();
+        let dfa = SparseDFA::new("ba.*").unwrap();
+        let got = search(&set, &dfa);
+        assert_eq!(got, vec!["bar", "baz", "xba", "xbax"]);
+    }
+
+    #[test]
+    fn sparse_anchored() {
+        let set =
+            Set::from_iter(&["a", "bar", "baz", "wat", "xba", "xbax", "z"])
+                .unwrap();
+        let dfa = dense::Builder::new()
+            .anchored(true)
+            .build("ba.*")
+            .unwrap()
+            .to_sparse()
+            .unwrap();
+        let got = search(&set, &dfa);
+        assert_eq!(got, vec!["bar", "baz"]);
+    }
+}
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