Merge branch 'pr-2321'

[apex] Support switch statements correctly in Cognitive Complexity

docs/pages/release_notes.md

@@ -180,6 +180,7 @@ methods on {% jdoc apex::lang.apex.ast.ApexParserVisitor %} and its implementati
 *   [#2280](https://github.com/pmd/pmd/pull/2280): \[cs] CPD: Replace C# tokenizer by an Antlr-based one - [Maikel Steneker](https://github.com/maikelsteneker)
 *   [#2297](https://github.com/pmd/pmd/pull/2297): \[apex] Cognitive complexity metrics - [Gwilym Kuiper](https://github.com/gwilymatgearset)
 *   [#2317](https://github.com/pmd/pmd/pull/2317): \[apex] New Rule - Test Methods Must Be In Test Classes - [Brian Nørremark](https://github.com/noerremark)
+*   [#2321](https://github.com/pmd/pmd/pull/2321): \[apex] Support switch statements correctly in Cognitive Complexity - [Gwilym Kuiper](https://github.com/gwilymatgearset)
 
 {% endtocmaker %}
 

pmd-apex/src/main/java/net/sourceforge/pmd/lang/apex/metrics/impl/visitors/CognitiveComplexityVisitor.java

@@ -16,6 +16,7 @@ import net.sourceforge.pmd.lang.apex.ast.ASTIfElseBlockStatement;
 import net.sourceforge.pmd.lang.apex.ast.ASTMethod;
 import net.sourceforge.pmd.lang.apex.ast.ASTMethodCallExpression;
 import net.sourceforge.pmd.lang.apex.ast.ASTPrefixExpression;
+import net.sourceforge.pmd.lang.apex.ast.ASTSwitchStatement;
 import net.sourceforge.pmd.lang.apex.ast.ASTTernaryExpression;
 import net.sourceforge.pmd.lang.apex.ast.ASTWhileLoopStatement;
 import net.sourceforge.pmd.lang.apex.ast.ApexNode;
@@ -231,4 +232,15 @@ public class CognitiveComplexityVisitor extends ApexParserVisitorAdapter {
         state.methodCall(node.getNode().getMethodName());
         return super.visit(node, data);
     }
+
+    @Override
+    public Object visit(ASTSwitchStatement node, Object data) {
+        State state = (State) data;
+
+        state.increaseNestingLevel();
+        super.visit(node, data);
+        state.decreaseNestingLevel();
+
+        return state;
+    }
 }

pmd-apex/src/test/resources/net/sourceforge/pmd/lang/apex/metrics/impl/xml/CognitiveComplexityTest.xml

@@ -359,4 +359,35 @@
             ]]>
         </code>
     </test-code>
+
+    <test-code>
+        <description>Switch statements only gain 1 complexity regardless of the number of cases</description>
+        <expected-problems>1</expected-problems>
+        <expected-messages>
+            <message>'c__Foo#foo(Integer)' has value 3.</message>
+        </expected-messages>
+        <code>
+            <![CDATA[
+            class Foo {
+              void foo(Integer n) {
+                switch on n {                       // +1
+                  when 1 {
+                    System.debug('when block 1');
+                  }
+                  when 2, 3, 4, 5 {
+                    if (n <= 3) {                   // +2
+                      System.debug('n <= 3');
+                    }
+
+                    System.debug('when block 2');
+                  }
+                  when else {
+                    System.debug('default');
+                  }
+                }
+              }
+            }
+            ]]>
+        </code>
+    </test-code>
 </test-data>