From ca28f5f41467fa412469ad6107929be4ab9aaa4c Mon Sep 17 00:00:00 2001
From: Dennis Ushakov <dennis.ushakov@gmail.com>
Date: Tue, 24 Nov 2015 20:53:40 +0300
Subject: [PATCH] cache itemscope tag #WEB-19192 fixed

---
 .../html/impl/util/MicrodataUtil.java         | 40 +++++++++++--------
 1 file changed, 24 insertions(+), 16 deletions(-)

diff --git a/xml/xml-psi-impl/src/com/intellij/html/impl/util/MicrodataUtil.java b/xml/xml-psi-impl/src/com/intellij/html/impl/util/MicrodataUtil.java
index b34326477307..37b7af269afc 100644
--- a/xml/xml-psi-impl/src/com/intellij/html/impl/util/MicrodataUtil.java
+++ b/xml/xml-psi-impl/src/com/intellij/html/impl/util/MicrodataUtil.java
@@ -24,6 +24,8 @@ import com.intellij.psi.PsiReference;
 import com.intellij.psi.XmlRecursiveElementVisitor;
 import com.intellij.psi.impl.source.resolve.reference.impl.providers.DependentNSReference;
 import com.intellij.psi.impl.source.resolve.reference.impl.providers.URLReference;
+import com.intellij.psi.util.CachedValueProvider;
+import com.intellij.psi.util.CachedValuesManager;
 import com.intellij.psi.xml.XmlAttribute;
 import com.intellij.psi.xml.XmlAttributeValue;
 import com.intellij.psi.xml.XmlFile;
@@ -66,27 +68,33 @@ public class MicrodataUtil {
     return null;
   }
 
-  private static Map<String, XmlTag> findScopesWithItemRef(@Nullable PsiFile file) {
+  private static Map<String, XmlTag> findScopesWithItemRef(@Nullable final PsiFile file) {
     if (!(file instanceof XmlFile)) return Collections.emptyMap();
-    final Map<String, XmlTag> result = new THashMap<String, XmlTag>();
-    file.accept(new XmlRecursiveElementVisitor() {
+    return CachedValuesManager.getCachedValue(file, new CachedValueProvider<Map<String, XmlTag>>() {
+      @Nullable
       @Override
-      public void visitXmlTag(final XmlTag tag) {
-        super.visitXmlTag(tag);
-        XmlAttribute refAttr = tag.getAttribute(ITEM_REF);
-        if (refAttr != null && tag.getAttribute(ITEM_SCOPE) != null) {
-          getReferencesForAttributeValue(refAttr.getValueElement(), new PairFunction<String, Integer, PsiReference>() {
-            @Nullable
-            @Override
-            public PsiReference fun(String t, Integer v) {
-              result.put(t, tag);
-              return null;
+      public Result<Map<String, XmlTag>> compute() {
+        final Map<String, XmlTag> result = new THashMap<String, XmlTag>();
+        file.accept(new XmlRecursiveElementVisitor() {
+          @Override
+          public void visitXmlTag(final XmlTag tag) {
+            super.visitXmlTag(tag);
+            XmlAttribute refAttr = tag.getAttribute(ITEM_REF);
+            if (refAttr != null && tag.getAttribute(ITEM_SCOPE) != null) {
+              getReferencesForAttributeValue(refAttr.getValueElement(), new PairFunction<String, Integer, PsiReference>() {
+                @Nullable
+                @Override
+                public PsiReference fun(String t, Integer v) {
+                  result.put(t, tag);
+                  return null;
+                }
+              });
             }
-          });
-        }
+          }
+        });
+        return Result.create(result, file);
       }
     });
-    return result;
   }
 
   public static List<String> extractProperties(PsiFile file, String type) {