public HighlightMarker(string fullText, string searchText, IHighlightProcessor highlightProcessor = null, char[] searchTextDelimiters = null)
{
this.index = new List <Range>();
this.highlightProcessor = highlightProcessor;
this.FullText = fullText;
this.SearchText = searchText;
if (searchTextDelimiters != null && searchTextDelimiters.Any())
{
this.SearchTextDelimiters = searchTextDelimiters;
}
}
private static IList <Range> CreateIndex(string fulltext, string searchtext, IHighlightProcessor processor, char[] delimiters)
{
if (string.IsNullOrEmpty(searchtext))
{
return(Enumerable.Empty <Range>().ToList());
}
var index = new List <Range>();
var searchStrings = searchtext.Trim().Split(delimiters, StringSplitOptions.RemoveEmptyEntries);
var fullTextItems = new List <string>();
// Process fulltext using the configured highlight processor(s)
if (processor == null)
{
fullTextItems.Add(fulltext);
}
else
{
var processedStrings = processor.GetFulltextItems(fulltext);
if (processedStrings != null && processedStrings.Length > 0)
{
fullTextItems.AddRange(processedStrings);
}
}
// Build highlighting index
foreach (string searchString in searchStrings)
{
int length = searchString.Length;
foreach (var fullTextItem in fullTextItems.Distinct())
{
int searchStringIndex = fullTextItem.IndexOf(searchString, 0, StringComparison.CurrentCultureIgnoreCase);
while (searchStringIndex >= 0)
{
index.Add(new Range(searchStringIndex, searchStringIndex + length));
int lastIndex = searchStringIndex + length;
searchStringIndex = fullTextItem.IndexOf(searchString, lastIndex, StringComparison.CurrentCultureIgnoreCase);
}
}
}
return(index);
}
public static void SetHighlightProcessor(DependencyObject d, IHighlightProcessor value)
{
d.SetValue(HighlightProcessorProperty, value);
}
