/// <summary>
/// Get the ordering priority of the previous contracting character in the
/// string. </summary>
/// <param name="ch"> the starting character of a contracting character token </param>
/// <returns> the next contracting character's ordering. Returns NULLORDER
/// if the end of string is reached. </returns>
private int PrevContractChar(int ch)
{
// This function is identical to nextContractChar(), except that we've
// switched things so that the next() and previous() calls on the Normalizer
// are switched and so that we skip entry pairs with the fwd flag turned on
// rather than off. Notice that we still use append() and startsWith() when
// working on the fragment. This is because the entry pairs that are used
// in reverse iteration have their names reversed already.
List <EntryPair> list = Ordering.GetContractValues(ch);
EntryPair pair = list[0];
int order = pair.Value;
pair = list[list.Count - 1];
int maxLength = pair.EntryName.Length();
NormalizerBase tempText = (NormalizerBase)Text_Renamed.clone();
tempText.next();
Key.Length = 0;
int c = tempText.previous();
while (maxLength > 0 && c != NormalizerBase.DONE)
{
if (Character.IsSupplementaryCodePoint(c))
{
Key.Append(Character.ToChars(c));
maxLength -= 2;
}
else
{
Key.Append((char)c);
--maxLength;
}
c = tempText.previous();
}
String fragment = Key.ToString();
maxLength = 1;
for (int i = list.Count - 1; i > 0; i--)
{
pair = list[i];
if (pair.Fwd)
{
continue;
}
if (fragment.StartsWith(pair.EntryName) && pair.EntryName.Length() > maxLength)
{
maxLength = pair.EntryName.Length();
order = pair.Value;
}
}
while (maxLength > 1)
{
c = Text_Renamed.previous();
maxLength -= Character.CharCount(c);
}
return(order);
}
/// <summary>
/// Get the ordering priority of the next contracting character in the
/// string. </summary>
/// <param name="ch"> the starting character of a contracting character token </param>
/// <returns> the next contracting character's ordering. Returns NULLORDER
/// if the end of string is reached. </returns>
private int NextContractChar(int ch)
{
// First get the ordering of this single character,
// which is always the first element in the list
List <EntryPair> list = Ordering.GetContractValues(ch);
EntryPair pair = list[0];
int order = pair.Value;
// find out the length of the longest contracting character sequence in the list.
// There's logic in the builder code to make sure the longest sequence is always
// the last.
pair = list[list.Count - 1];
int maxLength = pair.EntryName.Length();
// (the Normalizer is cloned here so that the seeking we do in the next loop
// won't affect our real position in the text)
NormalizerBase tempText = (NormalizerBase)Text_Renamed.clone();
// extract the next maxLength characters in the string (we have to do this using the
// Normalizer to ensure that our offsets correspond to those the rest of the
// iterator is using) and store it in "fragment".
tempText.previous();
Key.Length = 0;
int c = tempText.next();
while (maxLength > 0 && c != NormalizerBase.DONE)
{
if (Character.IsSupplementaryCodePoint(c))
{
Key.Append(Character.ToChars(c));
maxLength -= 2;
}
else
{
Key.Append((char)c);
--maxLength;
}
c = tempText.next();
}
String fragment = Key.ToString();
// now that we have that fragment, iterate through this list looking for the
// longest sequence that matches the characters in the actual text. (maxLength
// is used here to keep track of the length of the longest sequence)
// Upon exit from this loop, maxLength will contain the length of the matching
// sequence and order will contain the collation-element value corresponding
// to this sequence
maxLength = 1;
for (int i = list.Count - 1; i > 0; i--)
{
pair = list[i];
if (!pair.Fwd)
{
continue;
}
if (fragment.StartsWith(pair.EntryName) && pair.EntryName.Length() > maxLength)
{
maxLength = pair.EntryName.Length();
order = pair.Value;
}
}
// seek our current iteration position to the end of the matching sequence
// and return the appropriate collation-element value (if there was no matching
// sequence, we're already seeked to the right position and order already contains
// the correct collation-element value for the single character)
while (maxLength > 1)
{
c = Text_Renamed.next();
maxLength -= Character.CharCount(c);
}
return(order);
}
