Ensure to not declare a strongly typed variable more than once.

Sébastien Geiser · Sébastien Geiser · commit 6fbea306ab8b · 2019-09-30T10:52:56.000+02:00
diff --git a/CodingSeb.ExpressionEvaluator/ExpressionEvaluator.cs b/CodingSeb.ExpressionEvaluator/ExpressionEvaluator.cs
@@ -2121,6 +2121,9 @@ protected virtual bool EvaluateVarOrFunc(string expression, Stack<object> stack,
                         {
                             if (stack.Count == 1 && stack.Peek() is ClassOrEnumType classOrEnum)
                             {
+                                if (Variables.ContainsKey(varFuncName))
+                                    throw new ExpressionEvaluatorSyntaxErrorException($"Can not declare a new variable named [{varFuncName}]. A variable with this name already exists");
+
                                 stack.Pop();
 
                                 Variables[varFuncName] = new StronglyTypedVariable

Original file line number	Diff line number	Diff line change
`@@ -2121,6 +2121,9 @@ protected virtual bool EvaluateVarOrFunc(string expression, Stack<object> stack,`
`2121`	`2121`	`{`
`2122`	`2122`	`if (stack.Count == 1 && stack.Peek() is ClassOrEnumType classOrEnum)`
`2123`	`2123`	`{`
	`2124`	`+ if (Variables.ContainsKey(varFuncName))`
	`2125`	`+ throw new ExpressionEvaluatorSyntaxErrorException($"Can not declare a new variable named [{varFuncName}]. A variable with this name already exists");`
	`2126`	`+`
`2124`	`2127`	`stack.Pop();`
`2125`	`2128`
`2126`	`2129`	`Variables[varFuncName] = new StronglyTypedVariable`