private static void ThrowDataMissException(string name, bool skipRecursiveLookup)
{
var ex = new StubbleDataMissException($"'{name}' is undefined.");
ex.Data["Name"] = name;
ex.Data["SkipRecursiveLookup"] = skipRecursiveLookup;
throw ex;
}
/// <summary>
/// Looks up a value by name from the context
/// </summary>
/// <param name="name">The name of the value to lookup</param>
/// <exception cref="StubbleDataMissException">If ThrowOnDataMiss set then thrown on value not found</exception>
/// <returns>The value if found or null if not</returns>
public Expression Lookup(string name)
{
var instance = SourceData;
Expression value = null;
if (cache.TryGetValue(name, out var outValue))
{
value = outValue;
}
else
{
var context = this;
var lookupHit = false;
while (context != null)
{
var type = context.View;
if (name.IndexOf('.') > 0)
{
var names = name.Split('.');
for (var i = 0; i < names.Length; i++)
{
var tempValue = GetValueFromRegistry(type, instance, names[i]);
if (tempValue.Expression != null && tempValue.Type != null)
{
if (i == names.Length - 1)
{
lookupHit = true;
}
type = tempValue.Type;
instance = tempValue.Expression;
value = tempValue.Expression;
}
else if (i > 0)
{
return(null);
}
else
{
break;
}
}
}
else if (type != null)
{
var tempValue = GetValueFromRegistry(type, instance, name);
if (tempValue.Expression != null)
{
lookupHit = true;
value = tempValue.Expression;
}
}
if (lookupHit || CompilationSettings.SkipRecursiveLookup)
{
break;
}
context = context.ParentContext;
instance = context?.SourceData;
}
value = TryEnumerationConversionIfRequired(value);
cache[name] = value;
}
if (!CompilationSettings.ThrowOnDataMiss || value != null)
{
return(value);
}
var ex = new StubbleDataMissException($"'{name}' is undefined.");
ex.Data["Name"] = name;
ex.Data["SkipRecursiveLookup"] = CompilationSettings.SkipRecursiveLookup;
throw ex;
}