SSR: fix exception on invalid search template (IDEA-259106)

GitOrigin-RevId: 2baa413344e36389a2614407417f18f8a913f765

java/structuralsearch-java/src/com/intellij/structuralsearch/impl/matcher/handlers/StatementHandler.java

@@ -1,13 +1,10 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package com.intellij.structuralsearch.impl.matcher.handlers;
 
 import com.intellij.psi.*;
 import com.intellij.structuralsearch.impl.matcher.MatchContext;
 import org.jetbrains.annotations.NotNull;
 
-/**
- * Handler for statement search
- */
 public class StatementHandler extends MatchingHandler {
 
   @Override
@@ -16,6 +13,9 @@ public class StatementHandler extends MatchingHandler {
       // typed statement matches statements (including block statements) and comments
       return false;
     }
+    if (!(patternNode instanceof PsiExpressionStatement)) {
+      return false;
+    }
 
     final PsiExpression expression = ((PsiExpressionStatement)patternNode).getExpression();
     return context.getMatcher().match(expression, matchedNode);

platform/structuralsearch/testSource/com/intellij/structuralsearch/StructuralSearchTest.java

@@ -2591,6 +2591,16 @@ public class StructuralSearchTest extends StructuralSearchTestCase {
                "}";
     assertEquals("don't throw exception during matching", 0,
                  findMatchesCount(s, "void '_Method('_ParameterType '_Parameter*, '_LastType[] '_lastParameter);"));
+
+    String s2 = "class X {" +
+                "  void x() {" +
+                "    x();" +
+                "  }" +
+                "}";
+    assertEquals("don't throw exception during matching", 0,
+                 findMatchesCount(s2, "void '_x() {\n" +
+                                     "  '_x;\n" +
+                                     "}"));
   }
 
   public void testNoUnexpectedException() {