/// <summary>Records a replacement to be applied to the inputs
/// stream. Whenever <code>singleMatch</code> occurs in
/// the input, it will be replaced with
/// <code>replacement</code>.
///
/// </summary>
/// <param name="singleMatch">input String to be replaced
/// </param>
/// <param name="replacement">output String
/// </param>
public virtual void Add(System.String singleMatch, System.String replacement)
{
NormalizeCharMap currMap = this;
for (int i = 0; i < singleMatch.Length; i++)
{
char c = singleMatch[i];
if (currMap.submap == null)
{
currMap.submap = new System.Collections.Hashtable(1);
}
NormalizeCharMap map = (NormalizeCharMap)currMap.submap[CharacterCache.ValueOf(c)];
if (map == null)
{
map = new NormalizeCharMap();
currMap.submap[c] = map;
}
currMap = map;
}
if (currMap.normStr != null)
{
throw new System.SystemException("MappingCharFilter: there is already a mapping for " + singleMatch);
}
currMap.normStr = replacement;
currMap.diff = singleMatch.Length - replacement.Length;
}
private NormalizeCharMap Match(NormalizeCharMap map)
{
NormalizeCharMap result = null;
if (map.submap != null)
{
int chr = NextChar();
if (chr != -1)
{
NormalizeCharMap subMap = (NormalizeCharMap)map.submap[CharacterCache.ValueOf((char)chr)];
if (subMap != null)
{
result = Match(subMap);
}
if (result == null)
{
PushChar(chr);
}
}
}
if (result == null && map.normStr != null)
{
result = map;
}
return(result);
}
public override int Read()
{
while (true)
{
if (replacement != null && charPointer < replacement.Length)
{
return(replacement[charPointer++]);
}
int firstChar = NextChar();
if (firstChar == -1)
{
return(-1);
}
NormalizeCharMap nm = normMap.submap != null?(NormalizeCharMap)normMap.submap[CharacterCache.ValueOf((char)firstChar)]:null;
if (nm == null)
{
return(firstChar);
}
NormalizeCharMap result = Match(nm);
if (result == null)
{
return(firstChar);
}
replacement = result.normStr;
charPointer = 0;
if (result.diff != 0)
{
int prevCumulativeDiff = GetLastCumulativeDiff();
if (result.diff < 0)
{
for (int i = 0; i < -result.diff; i++)
{
AddOffCorrectMap(nextCharCounter + i - prevCumulativeDiff, prevCumulativeDiff - 1 - i);
}
}
else
{
AddOffCorrectMap(nextCharCounter - result.diff - prevCumulativeDiff, prevCumulativeDiff + result.diff);
}
}
}
}