protected static string SubstituteKownValue(string transformValue, RegularExpressions.Regex patternRegex, string patternPrefix, GetValueCallback getValueDelegate )
{
int position = 0;
List<RegularExpressions.Match> matchsExpr = new List<RegularExpressions.Match>();
do
{
position = transformValue.IndexOf(patternPrefix, position, StringComparison.OrdinalIgnoreCase);
if (position > -1)
{
RegularExpressions.Match match = patternRegex.Match(transformValue, position);
// Add the successful match to collection
if (match.Success)
{
matchsExpr.Add(match);
position = match.Index + match.Length;
}
else
{
position++;
}
}
} while (position > -1);
System.Text.StringBuilder strbuilder = new StringBuilder(transformValue.Length);
if (matchsExpr.Count > 0)
{
strbuilder.Remove(0, strbuilder.Length);
position = 0;
int index = 0;
foreach (RegularExpressions.Match match in matchsExpr)
{
strbuilder.Append(transformValue.Substring(position, match.Index - position));
RegularExpressions.Capture captureTagName = match.Groups["tagname"];
string attributeName = captureTagName.Value;
string newValue = getValueDelegate(attributeName);
if (newValue != null) // null indicate that the attribute is not exist
{
strbuilder.Append(newValue);
}
else
{
// keep original value
strbuilder.Append(match.Value);
}
position = match.Index + match.Length;
index++;
}
strbuilder.Append(transformValue.Substring(position));
transformValue = strbuilder.ToString();
}
return transformValue;
}
/**
* Helper method for extracting multiple matches from Tweet text.
*
* @param pattern to match and use for extraction
* @param text of the Tweet to extract from
* @param groupNumber the capturing group of the pattern that should be added to the list.
* @return list of extracted values, or an empty list if there were none.
*/
private List<String> ExtractList(TRE.Regex pattern, String text, int groupNumber)
{
List<String> extracted = new List<String>();
TRE.Match matcher = pattern.Match(text);
while (matcher.Success)
{
extracted.Add(matcher.Groups[groupNumber].Value);
matcher = matcher.NextMatch();
}
return extracted;
}