public static bool IsValid(string expression, VariableChecking variableChecking, List <IConstant> constants, ref HashSet <string> initializedVariables, out HashSet <string> uninitializedVariables, out string error)
{
uninitializedVariables = new HashSet <string>();
string _error = null;
var ne = new NumericExpression();
if (constants != null)
{
ne.Constants.AddRange(constants);
}
ne.UndefinedVariableFound += (s, e) => e.Handled = true; // variables are allowed
ne.UndefinedFunctionFound += (s, e) => e.Handled = true; // functions are allowed
try
{
var pe = ne.Parse(expression);
TraverseTree(pe.ExpressionTree, initializedVariables, uninitializedVariables);
if (variableChecking == VariableChecking.None)
{
uninitializedVariables.Clear();
}
if (uninitializedVariables.Count > 0)
{
error = "Uninitialized variables used in expression.";
return(false);
}
else
{
error = null;
return(true);
}
}
catch (ArgumentException e)
{
if (_error == null)
{
_error = string.Format("Error parsing expression. {0}", e.Message);
}
}
catch (Exception e)
{
_error = string.Format("Unexpected error while parsing expression. {0}", e.Message);
}
error = _error;
return(false);
}
public static bool IsValid(string expression, VariableChecking variableChecking, List<IConstant> constants, ref HashSet<string> initializedVariables, out HashSet<string> uninitializedVariables, out string error)
{
uninitializedVariables = new HashSet<string>();
string _error = null;
var ne = new NumericExpression();
if (constants != null)
{
ne.Constants.AddRange(constants);
}
ne.UndefinedVariableFound += (s, e) => e.Handled = true; // variables are allowed
ne.UndefinedFunctionFound += (s, e) => e.Handled = true; // functions are allowed
try
{
var pe = ne.Parse(expression);
TraverseTree(pe.ExpressionTree, initializedVariables, uninitializedVariables);
if (variableChecking == VariableChecking.None)
{
uninitializedVariables.Clear();
}
if (uninitializedVariables.Count > 0)
{
error = "Uninitialized variables used in expression.";
return false;
}
else
{
error = null;
return true;
}
}
catch (ArgumentException e)
{
if (_error == null)
{
_error = string.Format("Error parsing expression. {0}", e.Message);
}
}
catch (Exception e)
{
_error = string.Format("Unexpected error while parsing expression. {0}", e.Message);
}
error = _error;
return false;
}
