// HELP ROUTINES CALLED BY EVALUATOR TREE WALKER
/// <summary>
/// For names,phones:{n,p | ...} treat the names, phones as lists
/// to be walked in lock step as n=names[i], p=phones[i].
/// </summary>
public virtual Object applyTemplateToListOfAttributes(StringTemplate self, IList attributes, StringTemplate templateToApply)
{
if ( attributes==null || templateToApply==null || attributes.Count==0 )
{
return null; // do not apply if missing templates or empty values
}
IDictionary argumentContext = null;
IList results = new ArrayList();
// convert all attributes to iterators even if just one value
for (int a = 0; a < attributes.Count; a++)
{
Object o = attributes[a];
o = convertAnythingToIterator(o);
attributes[a] = o;
}
int numAttributes = attributes.Count;
// ensure arguments line up
IDictionary formalArguments = templateToApply.getFormalArguments();
if ( formalArguments==null || formalArguments.Count==0 )
{
self.error("missing arguments in anonymous"+
" template in context "+self.getEnclosingInstanceStackString());
return null;
}
ICollection keys = formalArguments.Keys;
Object[] formalArgumentNames = new object[keys.Count];
keys.CopyTo(formalArgumentNames,0);
if ( formalArgumentNames.Length!=numAttributes )
{
self.error("number of arguments "+SupportClass.CollectionToString(formalArguments.Keys)+
" mismatch between attribute list and anonymous"+
" template in context "+self.getEnclosingInstanceStackString());
// truncate arg list to match smaller size
int shorterSize = Math.Min(formalArgumentNames.Length, numAttributes);
numAttributes = shorterSize;
Object[] newFormalArgumentNames = new Object[shorterSize];
System.Array.Copy(formalArgumentNames, 0,
newFormalArgumentNames, 0,
shorterSize);
formalArgumentNames = newFormalArgumentNames;
}
// keep walking while at least one attribute has values
while ( true )
{
argumentContext = new Hashtable();
// get a value for each attribute in list; put into arg context
// to simulate template invocation of anonymous template
int numEmpty = 0;
for (int a = 0; a < numAttributes; a++)
{
IEnumerator it = (IEnumerator)attributes[a];
if ( it.MoveNext() )
{
String argName = (String)formalArgumentNames[a];
Object iteratedValue = it.Current;
argumentContext[argName] = iteratedValue;
}
else
{
numEmpty++;
}
}
if ( numEmpty==numAttributes )
{
break;
}
StringTemplate embedded = templateToApply.getInstanceOf();
embedded.setEnclosingInstance(self);
embedded.setArgumentContext(argumentContext);
results.Add(embedded);
}
return results;
}
