From 3fba5870446fd7f0d84688507b065b38e5de2ec0 Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@freecad.org>
Date: Sat, 1 Mar 2025 08:31:39 +0100
Subject: [PATCH] App: In ExpressionParser::parse add the failing expression
 text to the error message

---
 src/App/Expression.cpp | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/src/App/Expression.cpp b/src/App/Expression.cpp
index d87d381dae..1afb5ec56e 100644
--- a/src/App/Expression.cpp
+++ b/src/App/Expression.cpp
@@ -41,6 +41,7 @@
 #include <sstream>
 #include <stack>
 #include <string>
+#include <fmt/format.h>
 
 #include <App/Application.h>
 #include <App/DocumentObject.h>
@@ -3786,14 +3787,17 @@ Expression * App::ExpressionParser::parse(const App::DocumentObject *owner, cons
     // run the parser
     int result = ExpressionParser::ExpressionParser_yyparse ();
 
-    if (result != 0)
-        throw ParserError("Failed to parse expression.");
+    if (result != 0) {
+        throw ParserError(fmt::format("Failed to parse expression '{}'", buffer));
+    }
 
-    if (!ScanResult)
-        throw ParserError("Unknown error in expression");
+    if (!ScanResult) {
+        throw ParserError(fmt::format("Unknown error in expression '{}'", buffer));
+    }
 
-    if (valueExpression)
+    if (valueExpression) {
         return ScanResult;
+    }
     else {
         delete ScanResult;
         throw Expression::Exception("Expression can not evaluate to a value.");