protected override object DoEvaluate(ScriptingContext context)
{
F.Expression resolved = Expression.Resolve(context);
if (resolved == null)
{
throw new ScriptingException(
"Cannot resolve expression `{0}'", Name);
}
return(resolved.Evaluate(context));
}
public string EvaluateExpression(ScriptingContext context, string text,
DisplayFormat format)
{
F.Expression expression = context.ParseExpression(text);
try {
expression = expression.Resolve(context);
} catch (ScriptingException ex) {
throw new ScriptingException("Cannot resolve expression `{0}': {1}",
text, ex.Message);
} catch {
throw new ScriptingException("Cannot resolve expression `{0}'.", text);
}
try {
object retval = expression.Evaluate(context);
return(context.FormatObject(retval, format));
} catch (ScriptingException ex) {
throw new ScriptingException("Cannot evaluate expression `{0}': {1}",
text, ex.Message);
} catch {
throw new ScriptingException("Cannot evaluate expression `{0}'.", text);
}
}