// Concat rules (deduced)
// - ItemRef can concat only with a string ';' or PropertyRef ending in ';'
// - MetadataRef can concat with anything other than ItemRef
// - PropertyRef cannot be right after a ItemRef
// PropertyRef concats if it doesn't end in ';'
// - string cannot concat with ItemRef unless it is ';'.
// string concats if it ends in ';'
ITaskItem[] ConvertToITaskItemArray(Project project, ExpressionOptions options)
{
List <ITaskItem> finalItems = new List <ITaskItem> ();
object prev = null;
bool prev_can_concat = false;
foreach (object o in objects)
{
bool can_concat = prev_can_concat;
string str = o as string;
if (str != null)
{
string trimmed_str = str.Trim();
if (!IsSemicolon(str) && trimmed_str.Length > 0 && prev != null && prev is ItemReference)
{
// non-empty, non-semicolon string after item ref
ThrowCantConcatError(prev, str);
}
if (trimmed_str.Length == 0 && prev is string && IsSemicolon((string)prev))
{
// empty string after a ';', ignore it
continue;
}
// empty string _after_ a itemref, not an error
prev_can_concat = !(str.Length > 0 && str [str.Length - 1] == ';') && trimmed_str.Length > 0;
AddItemsToArray(finalItems,
ConvertToITaskItemArrayFromString(str),
can_concat);
prev = o;
continue;
}
IReference br = o as IReference;
if (br == null)
{
throw new Exception("BUG: Invalid type in objects collection.");
}
if (o is ItemReference)
{
if (prev != null && !(prev is string && (string)prev == ";"))
{
ThrowCantConcatError(prev, br);
}
prev_can_concat = true;
}
else if (o is MetadataReference)
{
if (prev != null && prev is ItemReference)
{
ThrowCantConcatError(prev, br);
}
prev_can_concat = true;
}
else if (o is PropertyReference)
{
if (prev != null && prev is ItemReference)
{
ThrowCantConcatError(prev, br);
}
string value = ((PropertyReference)o).GetValue(project);
prev_can_concat = !(value.Length > 0 && value [value.Length - 1] == ';');
}
AddItemsToArray(finalItems, br.ConvertToITaskItemArray(project, options), can_concat);
prev = o;
}
// Trim and Remove empty items
List <ITaskItem> toRemove = new List <ITaskItem> ();
for (int i = 0; i < finalItems.Count; i++)
{
string s = ((ITaskItem2)finalItems [i]).EvaluatedIncludeEscaped.Trim();
if (s.Length == 0)
{
toRemove.Add(finalItems [i]);
}
else
{
((ITaskItem2)finalItems [i]).EvaluatedIncludeEscaped = s;
}
}
foreach (ITaskItem ti in toRemove)
{
finalItems.Remove(ti);
}
return(finalItems.ToArray());
}
