From b0f98711a0845d80a29f9a622650372997c700b7 Mon Sep 17 00:00:00 2001
From: Stepan Koltsov <stepan.koltsov@jetbrains.com>
Date: Sun, 17 Jun 2012 05:55:24 +0400
Subject: [PATCH] idea: do not call prefix matcher in loop if prefix is empty

---
 .../completion/JetCompletionContributor.java   | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/idea/src/org/jetbrains/jet/plugin/completion/JetCompletionContributor.java b/idea/src/org/jetbrains/jet/plugin/completion/JetCompletionContributor.java
index 172bf2ea97c..82f329bf01e 100644
--- a/idea/src/org/jetbrains/jet/plugin/completion/JetCompletionContributor.java
+++ b/idea/src/org/jetbrains/jet/plugin/completion/JetCompletionContributor.java
@@ -349,15 +349,23 @@ public class JetCompletionContributor extends CompletionContributor {
                 (JetFile)reference.getExpression().getContainingFile())
                 .getBindingContext();
 
-        class PrefixMatcherNamePredicate extends NamePredicate {
-            @Override
-            public boolean matches(@NotNull Name name) {
-                return result.getPrefixMatcher().prefixMatches(name.getName());
+        final PrefixMatcher prefixMatcher = result.getPrefixMatcher();
+
+        NamePredicate namePredicate;
+        if (prefixMatcher.getPrefix().length() == 0) {
+            namePredicate = NamePredicate.all();
+        } else {
+            class PrefixMatcherNamePredicate extends NamePredicate {
+                @Override
+                public boolean matches(@NotNull Name name) {
+                    return prefixMatcher.prefixMatches(name.getName());
+                }
             }
+            namePredicate = new PrefixMatcherNamePredicate();
         }
 
         Collection<DeclarationDescriptor> descriptors = TipsManager.getReferenceVariants(
-                reference.getExpression(), bindingContext, new PrefixMatcherNamePredicate());
+                reference.getExpression(), bindingContext, namePredicate);
 
         Collection<DeclarationDescriptor> checkedDescriptors = Collections2.filter(descriptors, new Predicate<DeclarationDescriptor>() {
             @Override