From 7f307dfe8ee85cf62ef409bb64e8c1edb4fac4fb Mon Sep 17 00:00:00 2001
From: Bas Leijdekkers <basleijdekkers@gmail.com>
Date: Fri, 27 Jun 2014 15:34:22 +0200
Subject: [PATCH] EA-57372 & IDEA-126616 (Structural Search: throwable at
 com.intellij.structuralsearch.plugin.ui.SearchDialog$2.run)

---
 .../impl/matcher/compiler/PatternCompiler.java           | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/plugins/structuralsearch/source/com/intellij/structuralsearch/impl/matcher/compiler/PatternCompiler.java b/plugins/structuralsearch/source/com/intellij/structuralsearch/impl/matcher/compiler/PatternCompiler.java
index 1869f5f97ba4..8675b0a686b1 100644
--- a/plugins/structuralsearch/source/com/intellij/structuralsearch/impl/matcher/compiler/PatternCompiler.java
+++ b/plugins/structuralsearch/source/com/intellij/structuralsearch/impl/matcher/compiler/PatternCompiler.java
@@ -325,7 +325,11 @@ public class PatternCompiler {
 
     @Override
     public String getPrefix(int varIndex) {
-      return myPrefixes[varIndex];
+      try {
+        return myPrefixes[varIndex];
+      } catch (ArrayIndexOutOfBoundsException e) {
+        return null;
+      }
     }
   }
 
@@ -351,6 +355,9 @@ public class PatternCompiler {
       final String name = template.getSegmentName(i);
 
       final String prefix = prefixProvider.getPrefix(i);
+      if (prefix == null) {
+        throw new MalformedPatternException();
+      }
 
       buf.append(text.substring(prevOffset,offset));
       buf.append(prefix);