Support for var in record patterns (#1312)

Author: emandirola

changelog/@unreleased/pr-1312.v2.yml

@@ -0,0 +1,5 @@
+type: fix
+fix:
+  description: Support for var in record patterns
+  links:
+  - https://github.com/palantir/palantir-java-format/pull/1312

palantir-java-format/src/main/java/com/palantir/javaformat/java/java14/Java14InputAstVisitor.java

@@ -120,7 +120,11 @@ private void visitBindingPattern(ModifiersTree modifiers, Tree type, Name name)
         if (modifiers != null) {
             builder.addAll(visitModifiers(modifiers, Direction.HORIZONTAL, Optional.empty()));
         }
-        scan(type, null);
+        if (type == null) {
+            token("var");
+        } else {
+            scan(type, null);
+        }
         builder.breakOp(" ");
         if (name.isEmpty()) {
             token("_");

palantir-java-format/src/test/java/com/palantir/javaformat/java/FileBasedTests.java

@@ -50,7 +50,14 @@ public final class FileBasedTests {
                     .putAll(15, "I603")
                     .putAll(16, "I588")
                     .putAll(17, "I683", "I684", "I696")
-                    .putAll(21, "SwitchGuardClause", "SwitchRecord", "SwitchDouble", "SwitchUnderscore", "I880")
+                    .putAll(
+                            21,
+                            "SwitchGuardClause",
+                            "SwitchRecord",
+                            "SwitchDouble",
+                            "SwitchUnderscore",
+                            "I880",
+                            "I1309")
                     .build();
 
     private final Class<?> testClass;

palantir-java-format/src/test/resources/com/palantir/javaformat/java/testdata/I1309.input

@@ -0,0 +1,9 @@
+public class I1309 {
+  void x(Object o) {
+    if (o instanceof Record(Nested(var i), var j)) {}
+    switch (o) {
+      case Record(Nested(var i), var j, int k, char l, java.lang.String m, var n, var o, var p, var q, var r, var s, var t, var u, var v, var w, var x, var y, var z):
+      default:
+    }
+  }
+}

palantir-java-format/src/test/resources/com/palantir/javaformat/java/testdata/I1309.output

@@ -0,0 +1,27 @@
+public class I1309 {
+    void x(Object o) {
+        if (o instanceof Record(Nested(var i), var j)) {}
+        switch (o) {
+            case Record(
+                    Nested(var i),
+                    var j,
+                    int k,
+                    char l,
+                    java.lang.String m,
+                    var n,
+                    var o,
+                    var p,
+                    var q,
+                    var r,
+                    var s,
+                    var t,
+                    var u,
+                    var v,
+                    var w,
+                    var x,
+                    var y,
+                    var z):
+            default:
+        }
+    }
+}