pmd: fix #1118 ClassCastException in pmd.lang.ecmascript.ast.ASTElementGet

pmd/etc/changelog.txt

@@ -25,6 +25,7 @@ CPD Command Line Changes:
 
 Fixed bug  991: AvoidSynchronizedAtMethodLevel for static methods
 Fixed bug 1114: CPD - Tokenizer not initialized with requested properties
+Fixed bug 1118: ClassCastException in pmd.lang.ecmascript.ast.ASTElementGet
 
 
 May 1, 2013 - 5.0.4:

pmd/src/main/java/net/sourceforge/pmd/lang/ecmascript/ast/ASTElementGet.java

@@ -19,10 +19,10 @@ public class ASTElementGet extends AbstractEcmascriptNode<ElementGet> {
     }
 
     public EcmascriptNode getTarget() {
-	return (EcmascriptNode) node.getTarget();
+        return EcmascriptTreeBuilder.createNodeAdapter(node.getTarget());
     }
 
     public EcmascriptNode getElement() {
-	return (EcmascriptNode) node.getElement();
+        return EcmascriptTreeBuilder.createNodeAdapter(node.getElement());
     }
 }

pmd/src/main/java/net/sourceforge/pmd/lang/ecmascript/ast/EcmascriptTreeBuilder.java

@@ -146,7 +146,7 @@ public final class EcmascriptTreeBuilder implements NodeVisitor {
 	this.parseProblems = parseProblems;
     }
 
-    private <T extends AstNode> EcmascriptNode<T> createNodeAdapter(T node) {
+    static <T extends AstNode> EcmascriptNode<T> createNodeAdapter(T node) {
 	try {
 	    @SuppressWarnings("unchecked") // the register function makes sure only EcmascriptNode<T> can be added,
 	    // where T is "T extends AstNode".

pmd/src/test/java/net/sourceforge/pmd/lang/ecmascript/ast/EcmascriptParserTest.java

@@ -7,6 +7,7 @@ import static org.junit.Assert.assertEquals;
 
 import java.io.Reader;
 import java.io.StringReader;
+import java.util.List;
 
 import net.sourceforge.pmd.PMD;
 import net.sourceforge.pmd.lang.ast.Node;
@@ -17,13 +18,15 @@ import org.mozilla.javascript.ast.AstRoot;
 
 public class EcmascriptParserTest {
 
+    private EcmascriptNode<AstRoot> parse(String code) {
+        EcmascriptParser parser = new EcmascriptParser(new EcmascriptParserOptions());
+        Reader sourceCode = new StringReader(code);
+        return parser.parse(sourceCode);
+    }
+
     @Test
     public void testLineNumbers() {
-	
-	EcmascriptParser parser = new EcmascriptParser(new EcmascriptParserOptions());
-	Reader sourceCode = new StringReader(SOURCE_CODE);
-	EcmascriptNode<AstRoot> node = parser.parse(sourceCode);
-
+    EcmascriptNode<AstRoot> node = parse(SOURCE_CODE);
 	assertEquals(1, node.getBeginLine());
 	assertEquals(1, node.getBeginColumn());
 	assertEquals(3, node.getEndLine());
@@ -42,6 +45,19 @@ public class EcmascriptParserTest {
 	assertEquals(16, child.getEndColumn());
     }
 
+    /**
+     * Test bug https://sourceforge.net/p/pmd/bugs/1118/
+     */
+    @Test
+    public void testArrayAccess() {
+        EcmascriptNode<AstRoot> node = parse("function a() { b['a'] = 1; c[1] = 2; }");
+        List<ASTElementGet> arrays = node.findDescendantsOfType(ASTElementGet.class);
+        assertEquals("b", arrays.get(0).getTarget().getImage());
+        assertEquals("a", arrays.get(0).getElement().getImage());
+        assertEquals("c", arrays.get(1).getTarget().getImage());
+        assertEquals("1", arrays.get(1).getElement().getImage());
+    }
+
     private static final String SOURCE_CODE =
 	    "function a() {" + PMD.EOL
 	  + "  alert('hello');" + PMD.EOL