From 3f0118c88c9df28787a1f21c122ed328b0bb9458 Mon Sep 17 00:00:00 2001
From: Yan Zhulanow <yan.zhulanow@jetbrains.com>
Date: Fri, 24 Oct 2014 14:58:26 +0400
Subject: [PATCH] KotlinIsReferenceToExtension extracted

---
 .../KotlinIsReferenceToExtension.kt           | 31 +++++++++++++
 .../idea/references/JetSimpleNameReference.kt | 44 ++++++++++---------
 idea/src/META-INF/extensions/common.xml       |  3 ++
 3 files changed, 58 insertions(+), 20 deletions(-)
 create mode 100644 idea/idea-analysis/src/org/jetbrains/jet/plugin/references/KotlinIsReferenceToExtension.kt

diff --git a/idea/idea-analysis/src/org/jetbrains/jet/plugin/references/KotlinIsReferenceToExtension.kt b/idea/idea-analysis/src/org/jetbrains/jet/plugin/references/KotlinIsReferenceToExtension.kt
new file mode 100644
index 00000000000..ec2da34fc6b
--- /dev/null
+++ b/idea/idea-analysis/src/org/jetbrains/jet/plugin/references/KotlinIsReferenceToExtension.kt
@@ -0,0 +1,31 @@
+/*
+ * Copyright 2010-2014 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.jet.plugin.findUsages.handlers
+
+import com.intellij.openapi.extensions.ExtensionPointName
+import com.intellij.psi.PsiElement
+import org.jetbrains.jet.plugin.references.JetSimpleNameReference
+import org.jetbrains.jet.lang.psi.JetPsiFactory
+
+public trait KotlinIsReferenceToExtension {
+    class object {
+        public val EP_NAME: ExtensionPointName<KotlinIsReferenceToExtension> = ExtensionPointName.create("org.jetbrains.kotlin.isReferenceToExtension")!!
+    }
+
+    fun isReferenceTo(reference: JetSimpleNameReference, element: PsiElement): Boolean?
+    fun handleElementRename(reference: JetSimpleNameReference, psiFactory: JetPsiFactory, newElementName: String): PsiElement?
+}
\ No newline at end of file
diff --git a/idea/idea-analysis/src/org/jetbrains/kotlin/idea/references/JetSimpleNameReference.kt b/idea/idea-analysis/src/org/jetbrains/kotlin/idea/references/JetSimpleNameReference.kt
index a50124c04ed..61bf3e221ed 100644
--- a/idea/idea-analysis/src/org/jetbrains/kotlin/idea/references/JetSimpleNameReference.kt
+++ b/idea/idea-analysis/src/org/jetbrains/kotlin/idea/references/JetSimpleNameReference.kt
@@ -36,28 +36,27 @@ import org.jetbrains.kotlin.resolve.dataClassUtils.isComponentLike
 import org.jetbrains.kotlin.idea.caches.resolve.analyze
 import org.jetbrains.kotlin.psi.psiUtil.*
 import com.intellij.psi.impl.light.LightElement
+import com.intellij.openapi.extensions.Extensions
+import org.jetbrains.jet.plugin.findUsages.handlers.KotlinIsReferenceToExtension
 
 public class JetSimpleNameReference(
         jetSimpleNameExpression: JetSimpleNameExpression
 ) : JetSimpleReference<JetSimpleNameExpression>(jetSimpleNameExpression) {
 
     override fun isReferenceTo(element: PsiElement?): Boolean {
-       val resolvedElement = resolve()
-       if (resolvedElement == null || element == null) {
-           return false
-       }
-       if (isAndroidSyntheticElement(resolvedElement)) {
-           if (element is ValueResourceElementWrapper) {
-               val resource = element.getValue()!!
-               return (resolvedElement as JetProperty).getName() == resource.substring(resource.indexOf('/')+1)
-           }
+        if (element != null) {
+            val extensions = Extensions.getArea(element.getProject()).getExtensionPoint(
+                    KotlinIsReferenceToExtension.EP_NAME).getExtensions()
+            for (extension in extensions) {
+                val value = extension.isReferenceTo(this, element)
+                if (value != null) {
+                    return value
+                }
+            }
+        }
 
-       }
-       else if (resolvedElement is LightElement && element is JetProperty) {
-           return resolvedElement.getName() == element.getName()
-       }
-       return super.isReferenceTo(element)
-   }
+        return super.isReferenceTo(element)
+    }
 
     override fun getRangeInElement(): TextRange = TextRange(0, getElement().getTextLength())
 
@@ -87,12 +86,17 @@ public class JetSimpleNameReference(
             JetTokens.FIELD_IDENTIFIER -> psiFactory.createFieldIdentifier(newElementName)
             JetTokens.LABEL_IDENTIFIER -> psiFactory.createClassLabel(newElementName)
             else -> {
-                if (newElementName.startsWith("@+id/")) {
-                    psiFactory.createNameIdentifier(newElementName.substring(newElementName.indexOf('/')+1))
-                }
-                else {
-                    psiFactory.createNameIdentifier(newElementName)
+                val extensions = Extensions.getArea(expression.getProject()).getExtensionPoint(
+                        KotlinIsReferenceToExtension.EP_NAME).getExtensions()
+
+                var handled: PsiElement? = null
+                for (extension in extensions) {
+                    handled = extension.handleElementRename(this, psiFactory, newElementName)
+                    if (handled != null) {
+                        break
+                    }
                 }
+                handled ?: psiFactory.createNameIdentifier(newElementName)
             }
         }
 
diff --git a/idea/src/META-INF/extensions/common.xml b/idea/src/META-INF/extensions/common.xml
index 1a893f802ce..8d95e053068 100644
--- a/idea/src/META-INF/extensions/common.xml
+++ b/idea/src/META-INF/extensions/common.xml
@@ -17,5 +17,8 @@
         <extensionPoint name="findUsagesHandlerDecorator"
                         interface="org.jetbrains.jet.plugin.findUsages.handlers.KotlinFindUsagesHandlerDecorator"
                         area="IDEA_PROJECT"/>
+        <extensionPoint name="isReferenceToExtension"
+                        interface="org.jetbrains.jet.plugin.findUsages.handlers.KotlinIsReferenceToExtension"
+                        area="IDEA_PROJECT"/>
     </extensionPoints>
 </idea-plugin>