fix crash : rename class

Author: tangzx

src/main/java/com/tang/intellij/lua/comment/psi/LuaDocPsiImplUtil.kt

@@ -54,7 +54,7 @@ fun getName(identifierOwner: PsiNameIdentifierOwner): String? {
 fun setName(identifierOwner: PsiNameIdentifierOwner, newName: String): PsiElement {
     val oldId = identifierOwner.nameIdentifier
     if (oldId != null) {
-        val newId = LuaElementFactory.createIdentifier(identifierOwner.project, newName)
+        val newId = LuaElementFactory.createDocIdentifier(identifierOwner.project, newName)
         oldId.replace(newId)
         return newId
     }
@@ -160,13 +160,7 @@ fun getPresentation(classDef: LuaDocClassDef): ItemPresentation {
 
 fun getType(classDef: LuaDocClassDef): ITyClass {
     val stub = classDef.stub
-    val luaType: ITyClass
-    if (stub != null) {
-        luaType = stub.classType
-    } else {
-        luaType = TyPsiDocClass(classDef)
-    }
-    return luaType
+    return stub?.classType ?: TyPsiDocClass(classDef)
 }
 
 /**

src/main/java/com/tang/intellij/lua/psi/LuaElementFactory.java

@@ -20,6 +20,7 @@
 import com.intellij.psi.PsiElement;
 import com.intellij.psi.PsiFileFactory;
 import com.intellij.psi.util.PsiTreeUtil;
+import com.tang.intellij.lua.comment.psi.LuaDocFieldDef;
 import com.tang.intellij.lua.lang.LuaLanguage;
 import org.jetbrains.annotations.NotNull;
 
@@ -65,4 +66,11 @@ public static PsiElement createWith(Project project, String code) {
         LuaFile file = createFile(project, code);
         return file.getFirstChild();
     }
+
+    public static PsiElement createDocIdentifier(Project project, String name) {
+        PsiElement element = createWith(project, "---@field " + name + " string");
+        LuaDocFieldDef fieldDef = PsiTreeUtil.findChildOfType(element, LuaDocFieldDef.class);
+        assert fieldDef != null;
+        return fieldDef.getId();
+    }
 }