public object GetAttributeValue(int attribute)
{
// Lazy load mappings
if (attr_to_val_handler == null)
{
PopulateAttributeDictionary();
}
if (!attr_to_val_handler.ContainsKey(attribute))
{
throw new ArgumentException();
}
TagDataValueHandler val_handler = attr_to_val_handler[attribute];
Line line;
LineTag tag;
int pos;
List <TagData> tags = new List <TagData> ();
Document d = textboxbase.document;
int point = normalizer.StartPoint;
while (point < normalizer.EndPoint)
{
d.CharIndexToLineTag(point, out line,
out tag, out pos);
tags.Add(new TagData(tag, line));
point += tag.Length;
}
IEnumerable <TagData> results
= tags.Distinct(new LineTagComparer(val_handler));
int count = results.Count();
if (count == 1)
{
return(val_handler(results.First()));
}
else if (count > 1)
{
return(TextPattern.MixedAttributeValue);
}
return(null);
}
public LineTagComparer(TagDataValueHandler h)
{
this.val_handler = h;
}
public ITextRangeProvider FindAttribute(int attribute, object @value,
bool backward)
{
// Lazy load mappings
if (attr_to_val_handler == null)
{
PopulateAttributeDictionary();
}
if (!attr_to_val_handler.ContainsKey(attribute))
{
return(null);
}
Line line;
LineTag tag;
int pos;
TagDataValueHandler val_handler = attr_to_val_handler[attribute];
Document d = textboxbase.document;
TextRangeProvider range = null;
if (!backward)
{
for (int i = StartPoint; i < EndPoint; i += tag.Length)
{
d.CharIndexToLineTag(i, out line, out tag, out pos);
if (val_handler(new TagData(tag, line)).Equals(@value))
{
if (range == null)
{
range = new TextRangeProvider(provider, textboxbase,
i, i + tag.Length);
}
else
{
range.EndPoint += tag.Length;
}
}
else if (range != null)
{
break;
}
}
}
else
{
for (int i = EndPoint - 1; i >= StartPoint; i -= tag.Length)
{
d.CharIndexToLineTag(i, out line, out tag, out pos);
if (val_handler(new TagData(tag, line)).Equals(@value))
{
if (range == null)
{
int start = i - tag.Length + 1;
range = new TextRangeProvider(provider, textboxbase,
start, start + tag.Length);
}
else
{
range.StartPoint -= tag.Length;
}
}
else if (range != null)
{
break;
}
}
}
return(range);
}