internal EvalWorker(StringTokenizer tokenizer, object context, EvaluateFlags flags)
{
this.Tokenizer = tokenizer;
Flags = flags;
Evaluator = new TokenEvaluator(context, tokenizer);
this.Evaluator.TokenNotFound += new TokenEvaluatorEventHandler(Evaluator_TokenNotFound);
}
/// <summary>
/// Evaluates the property expansion.
/// </summary>
/// <param name="propertyName"></param>
/// <returns></returns>
public object Evaluate(string propertyName, EvaluateFlags flags)
{
TokenEvaluationResults results = this.EvaluateInternal(propertyName, flags, false);
if (results == null)
{
return(string.Format("[Fatal: {0}]", propertyName));
}
// what happened?
if (results.HasError)
{
return(string.Format("[{0}]", results.Error));
}
else
{
return(results.Value);
}
}
// mbr - 2009-04-24 - added overload to allow passing of "ignore null values" check...
public string Replace(string text, object context, EvaluateFlags flags)
{
if (context == null)
{
throw new ArgumentNullException("context");
}
// check...
if (text == null || text.Length == 0)
{
return(text);
}
// repalce....
Regex regex = new Regex(EvalRegex, RegexOptions.IgnoreCase | RegexOptions.Multiline);
EvalWorker worker = new EvalWorker(this, context, flags);
return(regex.Replace(text, new MatchEvaluator(worker.EvaluatePlaceholder)));
}
/// <summary>
/// Evaluates the property expansion, returning more details.
/// </summary>
/// <param name="propertyName"></param>
/// <returns></returns>
private TokenEvaluationResults EvaluateInternal(string propertyName, EvaluateFlags flags, bool useAdvancedMethod)
{
if (propertyName == null)
{
throw new ArgumentNullException("propertyName");
}
if (propertyName.Length == 0)
{
throw new ArgumentOutOfRangeException("'propertyName' is zero-length.");
}
// mbr - 13-06-2007 - force string?
bool forceString = false;
if ((int)(flags & EvaluateFlags.ConvertResultToString) != 0)
{
forceString = true;
}
// check...
if (Host == null)
{
throw new InvalidOperationException("'Host' is null.");
}
// walk...
try
{
// mbr - 02-02-2006 - if the context is dictionary, then go in one level...
object useObject = null;
string toEvaluate = propertyName;
if (Context is IDictionary)
{
// trim...
int index = propertyName.IndexOf(".");
string remaining = null;
if (index != -1)
{
propertyName = toEvaluate.Substring(0, index).Trim();
remaining = toEvaluate.Substring(index + 1).Trim();
}
// get...
useObject = ((IDictionary)this.Context)[propertyName];
if (useObject == null)
{
var e = new TokenEvaluatorEventArgs(propertyName);
this.OnTokenNotFound(e);
// return...
if (e.WasResultSet)
{
// mbr - 2013-06-07 - step through into the remaining items...
//return new TokenEvaluationResults(null, DoStringConversion(e.Result));
useObject = e.Result;
}
else
{
// mbr - 2009-04-24 - if we are ignoring missing values, send back an error...
if ((int)(flags & EvaluateFlags.IgnoreMissingValues) != 0)
{
return(new TokenEvaluationResults(useObject, null, null, null, string.Format("(Couldn't evaluate [{0}])", propertyName)));
}
else
{
return(null);
}
}
}
// anything else?
if (remaining == null || remaining.Length == 0)
{
if (forceString)
{
return(new TokenEvaluationResults(useObject, null, DoStringConversion(useObject)));
}
else
{
return(new TokenEvaluationResults(useObject, null, useObject));
}
}
// flip...
toEvaluate = remaining;
}
else
{
useObject = this.Context;
}
// mbr - 25-07-2008 - ok, if we have an entity and a single part expression, look for the field, otherwise use data binder...
if (useAdvancedMethod && useObject is Entity && toEvaluate.IndexOf(".") == -1)
{
// find that member!
EntityType et = EntityType.GetEntityType(useObject, OnNotFound.ThrowException);
if (et == null)
{
throw new InvalidOperationException("et is null.");
}
// we're looking for a value...
object value = null;
EntityMember usedMember = null;
// find...
EntityField field = et.Fields[toEvaluate];
if (field != null)
{
usedMember = field;
value = field.GetValue(useObject);
}
else
{
EntityProperty prop = et.Properties[toEvaluate];
if (prop != null)
{
usedMember = prop;
value = prop.GetValue(useObject);
}
else
{
// ChildToParentEntityLink link = (ChildToParentEntityLink)et.ChildLinks[toEvaluate];
// if(link != null)
// {
// usedMember = link;
// value = link.GetValue(useObject);
// }
// else
value = DataBinder.Eval(useObject, toEvaluate);
}
}
// convert...
if (forceString)
{
value = DoStringConversion(value);
}
// return the value...
return(new TokenEvaluationResults(useObject, usedMember, value));
}
else
{
// eval from there...
object value = DataBinder.Eval(useObject, toEvaluate);
if (forceString)
{
value = DoStringConversion(value);
}
// return the value...
return(new TokenEvaluationResults(useObject, null, value));
}
}
catch (Exception ex)
{
if (this.Log.IsWarnEnabled)
{
this.Log.Warn(string.Format("Failed to evaluate '{0}'.", propertyName), ex);
}
// mbr - 25-07-2008 - changed to use object...
//return string.Format("(Couldn't evaluate [{0}])", propertyName);
return(new TokenEvaluationResults(null, null, null, ex, string.Format("(Couldn't evaluate [{0}])", propertyName)));
}
}
/// <summary>
/// Evaluates the property expansion, returning more details.
/// </summary>
/// <param name="propertyName"></param>
/// <returns></returns>
public TokenEvaluationResults Evaluate2(string propertyName, EvaluateFlags flags)
{
return(this.EvaluateInternal(propertyName, flags, true));
}