public static object EvaluateUntypedExpression(string p_expression, IParameterResolver p_resolver, IAttributeDataCollection p_collection, bool p_referenced)
{
hasErrorInEvaluation = false;
if (_cachedExpressions == null)
{
_cachedExpressions = new Dictionary <string, Expression>();
}
Expression cachedExpression;
if (!_cachedExpressions.ContainsKey(p_expression))
{
cachedExpression = new Expression(p_expression);
_cachedExpressions.Add(p_expression, cachedExpression);
}
else
{
cachedExpression = _cachedExpressions[p_expression];
}
EvaluateFunctionHandler evalFunction = (name, args) => EvaluateFunction(name, args);
cachedExpression.EvaluateFunction += evalFunction;
EvaluateParameterHandler evalParam = (name, args) => EvaluateParameter(name, args, p_resolver, p_collection, p_referenced);
cachedExpression.EvaluateParameter += evalParam;
object obj = null;
try
{
obj = cachedExpression.Evaluate();
}
catch (Exception e)
{
// Only set if we didn't already encounter error in evaluation otherwise this may be unspecified exception as a result of the already logged error so we don't want to overwrite it
if (!hasErrorInEvaluation)
{
errorMessage = e.Message;
hasErrorInEvaluation = true;
}
}
cachedExpression.EvaluateFunction -= evalFunction;
cachedExpression.EvaluateParameter -= evalParam;
return(obj);
}
public static T EvaluateExpression <T>(string p_expression, IParameterResolver p_resolver, IAttributeDataCollection p_collection, bool p_referenced)
{
hasErrorInEvaluation = false;
if (_cachedExpressions == null)
{
_cachedExpressions = new Dictionary <string, Expression>();
}
Expression cachedExpression;
if (!_cachedExpressions.ContainsKey(p_expression))
{
// We cache before macro replacement so runtime macro changes are not possible for performance reasons
cachedExpression = new Expression(ReplaceMacros(p_expression));
_cachedExpressions.Add(p_expression, cachedExpression);
}
else
{
cachedExpression = _cachedExpressions[p_expression];
}
EvaluateFunctionHandler evalFunction = (name, args) => EvaluateFunction <T>(name, args);
cachedExpression.EvaluateFunction += evalFunction;
EvaluateParameterHandler evalParam = (name, args) => EvaluateParameter(name, args, p_resolver, p_collection, p_referenced);
cachedExpression.EvaluateParameter += evalParam;
object obj = null;
//try
{
obj = cachedExpression.Evaluate();
}
// catch (Exception e)
// {
// // Only set if we didn't already encounter error in evaluation otherwise this may be unspecified exception as a result of the already logged error so we don't want to overwrite it
// if (!hasErrorInEvaluation)
// {
// errorMessage = e.Message;
// hasErrorInEvaluation = true;-+
// }
// }
cachedExpression.EvaluateFunction -= evalFunction;
cachedExpression.EvaluateParameter -= evalParam;
if (obj != null)
{
Type returnType = obj.GetType();
if (typeof(T).IsAssignableFrom(returnType))
{
return((T)obj);
}
// Explicit numeric type casting at cost of precision/overflow
if (typeof(T).IsNumericType() && returnType.IsNumericType())
{
return((T)Convert.ChangeType(obj, typeof(T)));
}
if (typeof(T).IsImplicitlyAssignableFrom(returnType))
{
return((T)Convert.ChangeType(obj, typeof(T)));
}
if (typeof(T) == typeof(string))
{
return((T)(object)obj.ToString());
}
Debug.LogWarning("Invalid expression casting " + obj.GetType() + " and " + typeof(T));
}
return(default(T));
}
