From 8fb05d53cbf7b30cc7ead2d27d4b4b15adbc0261 Mon Sep 17 00:00:00 2001
From: azv <azv@opencascade.com>
Date: Thu, 15 Apr 2021 16:57:45 +0300
Subject: [PATCH] Revert deletion of
 BuildPlugin_ValidatorExpressionInterpolation::isValid()

---
 src/BuildPlugin/BuildPlugin_Validators.cpp | 24 ++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/src/BuildPlugin/BuildPlugin_Validators.cpp b/src/BuildPlugin/BuildPlugin_Validators.cpp
index b7a878a3f..46163ae18 100644
--- a/src/BuildPlugin/BuildPlugin_Validators.cpp
+++ b/src/BuildPlugin/BuildPlugin_Validators.cpp
@@ -699,3 +699,27 @@ bool BuildPlugin_ValidatorBaseForVertex::isValid(const AttributePtr& theAttribut
 
   return true;
 }
+
+//=================================================================================================
+bool BuildPlugin_ValidatorExpressionInterpolation::isValid(const AttributePtr& theAttribute,
+                                                   const std::list<std::string>& /*theArguments*/,
+                                                   Events_InfoMessage& theError) const
+{
+  FeaturePtr aFeature = std::dynamic_pointer_cast<ModelAPI_Feature>(theAttribute->owner());
+
+  AttributeStringPtr aStrAttr =
+      std::dynamic_pointer_cast<ModelAPI_AttributeString>(theAttribute);
+  if (!aStrAttr->isInitialized()) {
+    theError = "Attribute \"%1\" is not initialized.";
+    theError.arg(aStrAttr->id());
+    return false;
+  }
+  bool isEmptyExpr = aStrAttr->value().empty();
+  if (isEmptyExpr) {
+    theError = "Expression is empty.";
+    return false;
+  }
+
+  theError = aFeature->string(BuildPlugin_Interpolation::EXPRESSION_ERROR_ID())->value();
+  return theError.empty();
+}
-- 
2.39.2