Java LoC metric (#694)

* WIP of Java LoC metric

* Enables 2 passing simple tests

* Adds more individual loc tests

* Initial impl of JavaCode Getter trait

get_space_kind was needed to fix an off by one issue with ploc

* Test cleanup

* Fix test

* Fixes handling of for loops

* Adds while

* Remove println

* Ran fmt

* Reduce to handle only SLOC off by 1

* Adds ternary lloc to test

* Adds expression grammar lloc

* Removes expressions from count

* Do not count expressions in for loop

* Removes debugging lines

* Fixes for the recent Stats changes

* Defines space kinds

* Adds interface space

src/getter.rs

@@ -509,4 +509,16 @@ impl Getter for CppCode {
 
 impl Getter for PreprocCode {}
 impl Getter for CcommentCode {}
-impl Getter for JavaCode {}
+impl Getter for JavaCode {
+    fn get_space_kind(node: &Node) -> SpaceKind {
+        use Java::*;
+
+        let typ = node.object().kind_id();
+        match typ.into() {
+            InterfaceDeclaration | ClassDeclaration => SpaceKind::Class,
+            MethodDeclaration | LambdaExpression => SpaceKind::Function,
+            Program => SpaceKind::Unit,
+            _ => SpaceKind::Unknown,
+        }
+    }
+}