[apex] Add parser support for EmptyReferenceExpression

pmd-apex/src/main/java/net/sourceforge/pmd/lang/apex/ast/ASTEmptyReferenceExpression.java

@@ -0,0 +1,22 @@
+/*
+ * BSD-style license; for more info see http://pmd.sourceforge.net/license.html
+ */
+
+package net.sourceforge.pmd.lang.apex.ast;
+
+import apex.jorje.semantic.ast.expression.EmptyReferenceExpression;
+
+public class ASTEmptyReferenceExpression extends AbstractApexNode<EmptyReferenceExpression> {
+
+
+    ASTEmptyReferenceExpression(EmptyReferenceExpression node) {
+        super(node);
+    }
+
+
+    @Override
+    public Object jjtAccept(ApexParserVisitor visitor, Object data) {
+        return visitor.visit(this, data);
+    }
+
+}

pmd-apex/src/main/java/net/sourceforge/pmd/lang/apex/ast/ApexParserVisitor.java

@@ -203,4 +203,6 @@ public interface ApexParserVisitor {
     Object visit(ASTLiteralCase node, Object data);
 
     Object visit(ASTIdentifierCase node, Object data);
+
+    Object visit(ASTEmptyReferenceExpression node, Object data);
 }

pmd-apex/src/main/java/net/sourceforge/pmd/lang/apex/ast/ApexParserVisitorAdapter.java

@@ -498,4 +498,9 @@ public class ApexParserVisitorAdapter implements ApexParserVisitor {
     public Object visit(ASTLiteralCase node, Object data) {
         return visit((ApexNode<?>) node, data);
     }
+
+    @Override
+    public Object visit(ASTEmptyReferenceExpression node, Object data) {
+        return visit((ApexNode<?>) node, data);
+    }
 }

pmd-apex/src/main/java/net/sourceforge/pmd/lang/apex/ast/ApexTreeBuilder.java

@@ -40,6 +40,7 @@ import apex.jorje.semantic.ast.expression.BindExpressions;
 import apex.jorje.semantic.ast.expression.BooleanExpression;
 import apex.jorje.semantic.ast.expression.CastExpression;
 import apex.jorje.semantic.ast.expression.ClassRefExpression;
+import apex.jorje.semantic.ast.expression.EmptyReferenceExpression;
 import apex.jorje.semantic.ast.expression.Expression;
 import apex.jorje.semantic.ast.expression.IllegalStoreExpression;
 import apex.jorje.semantic.ast.expression.InstanceOfExpression;
@@ -221,6 +222,7 @@ public final class ApexTreeBuilder extends AstVisitor<AdditionalPassScope> {
         register(ValueWhenBlock.class, ASTValueWhenBlock.class);
         register(LiteralCase.class, ASTLiteralCase.class);
         register(IdentifierCase.class, ASTIdentifierCase.class);
+        register(EmptyReferenceExpression.class, ASTEmptyReferenceExpression.class);
     }
 
     private static <T extends AstNode> void register(Class<T> nodeType,
@@ -849,4 +851,9 @@ public final class ApexTreeBuilder extends AstVisitor<AdditionalPassScope> {
     public boolean visit(IdentifierCase node, AdditionalPassScope scope) {
         return visit(node);
     }
+
+    @Override
+    public boolean visit(EmptyReferenceExpression node, AdditionalPassScope scope) {
+        return visit(node);
+    }
 }

pmd-apex/src/main/java/net/sourceforge/pmd/lang/apex/rule/AbstractApexRule.java

@@ -37,6 +37,7 @@ import net.sourceforge.pmd.lang.apex.ast.ASTDmlUpdateStatement;
 import net.sourceforge.pmd.lang.apex.ast.ASTDmlUpsertStatement;
 import net.sourceforge.pmd.lang.apex.ast.ASTDoLoopStatement;
 import net.sourceforge.pmd.lang.apex.ast.ASTElseWhenBlock;
+import net.sourceforge.pmd.lang.apex.ast.ASTEmptyReferenceExpression;
 import net.sourceforge.pmd.lang.apex.ast.ASTExpression;
 import net.sourceforge.pmd.lang.apex.ast.ASTExpressionStatement;
 import net.sourceforge.pmd.lang.apex.ast.ASTField;
@@ -640,4 +641,9 @@ public abstract class AbstractApexRule extends AbstractRule
     public Object visit(ASTLiteralCase node, Object data) {
         return visit((ApexNode<?>) node, data);
     }
+
+    @Override
+    public Object visit(ASTEmptyReferenceExpression node, Object data) {
+        return visit((ApexNode<?>) node, data);
+    }
 }

pmd-apex/src/test/java/net/sourceforge/pmd/lang/apex/ast/ApexParserTest.java

@@ -179,7 +179,7 @@ public class ApexParserTest extends ApexParserTestBase {
         Assert.assertNotNull(rootNode);
 
         int count = visitPosition(rootNode, 0);
-        Assert.assertEquals(427, count);
+        Assert.assertEquals(487, count);
     }
 
     private int visitPosition(Node node, int count) {