userdiff: support Java sealed classes

A new kind of class was added in Java 17 -- sealed classes.[1]  This
feature includes several new keywords that may appear in a declaration
of a class.  New modifiers before name of the class: "sealed" and
"non-sealed", and a clause after name of the class marked by keyword
"permits".

The current set of regular expressions in userdiff.c already allows the
modifier "sealed" and the "permits" clause, but not the modifier
"non-sealed", which is the first hyphenated keyword in Java.[2]  Allow
hyphen in the words that precede the name of type to match the
"non-sealed" modifier.

In new input file "java-sealed" for the test t4018-diff-funcname.sh, use
a Java code comment for the marker "RIGHT".  This workaround is needed,
because the name of the sealed class appears on the line of code that
has the "ChangeMe" marker.

[1] Detailed description in "JEP 409: Sealed Classes"
    https://openjdk.org/jeps/409
[2] "JEP draft: Keyword Management for the Java Language"
    https://openjdk.org/jeps/8223002

Signed-off-by: Andrei Rybak <rybak.a.v@gmail.com>
Reviewed-by: Johannes Sixt <j6t@kdbg.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

7 files changed, 40 insertions, 1 deletions

diff --git a/t/t4018/java-non-sealed b/t/t4018/java-non-sealed
new file mode 100644
index 0000000000..069087c1c6
--- /dev/null
+++ b/t/t4018/java-non-sealed
@@ -0,0 +1,8 @@
+public abstract sealed class SealedClass {
+    public static non-sealed class RIGHT extends SealedClass {
+        static int ONE;
+        static int TWO;
+        static int THREE;
+        private int ChangeMe;
+    }
+}
diff --git a/t/t4018/java-sealed b/t/t4018/java-sealed
new file mode 100644
index 0000000000..785fbc62bc
--- /dev/null
+++ b/t/t4018/java-sealed
@@ -0,0 +1,7 @@
+public abstract sealed class Sealed { // RIGHT
+    static int ONE;
+    static int TWO;
+    static int THREE;
+    public final class ChangeMe extends Sealed {
+    }
+}
diff --git a/t/t4018/java-sealed-permits b/t/t4018/java-sealed-permits
new file mode 100644
index 0000000000..18dd4894cf
--- /dev/null
+++ b/t/t4018/java-sealed-permits
@@ -0,0 +1,6 @@
+public abstract sealed class RIGHT permits PermittedA, PermittedB {
+    static int ONE;
+    static int TWO;
+    static int THREE;
+    private int ChangeMe;
+}
diff --git a/t/t4018/java-sealed-type-parameters b/t/t4018/java-sealed-type-parameters
new file mode 100644
index 0000000000..e6530c47c3
--- /dev/null
+++ b/t/t4018/java-sealed-type-parameters
@@ -0,0 +1,6 @@
+public abstract sealed class RIGHT<A, B> {
+    static int ONE;
+    static int TWO;
+    static int THREE;
+    private int ChangeMe;
+}
diff --git a/t/t4018/java-sealed-type-parameters-implements-permits b/t/t4018/java-sealed-type-parameters-implements-permits
new file mode 100644
index 0000000000..bd6e6d3582
--- /dev/null
+++ b/t/t4018/java-sealed-type-parameters-implements-permits
@@ -0,0 +1,6 @@
+public abstract sealed class RIGHT<A, B> implements List<A> permits PermittedA, PermittedB {
+    static int ONE;
+    static int TWO;
+    static int THREE;
+    private int ChangeMe;
+}
diff --git a/t/t4018/java-sealed-type-parameters-permits b/t/t4018/java-sealed-type-parameters-permits
new file mode 100644
index 0000000000..25a0da6442
--- /dev/null
+++ b/t/t4018/java-sealed-type-parameters-permits
@@ -0,0 +1,6 @@
+public abstract sealed class RIGHT<A, B> permits PermittedA, PermittedB {
+    static int ONE;
+    static int TWO;
+    static int THREE;
+    private int ChangeMe;
+}
diff --git a/userdiff.c b/userdiff.c
index 37ac98e177..94cca1a2a8 100644
--- a/userdiff.c
+++ b/userdiff.c
@@ -171,7 +171,7 @@ PATTERNS("html",
 PATTERNS("java",
 	 "!^[ \t]*(catch|do|for|if|instanceof|new|return|switch|throw|while)\n"
 	 /* Class, enum, interface, and record declarations */
-	 "^[ \t]*(([a-z]+[ \t]+)*(class|enum|interface|record)[ \t]+.*)$\n"
+	 "^[ \t]*(([a-z-]+[ \t]+)*(class|enum|interface|record)[ \t]+.*)$\n"
 	 /* Method definitions; note that constructor signatures are not */
 	 /* matched because they are indistinguishable from method calls. */
 	 "^[ \t]*(([A-Za-z_<>&][][?&<>.,A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$",