/// <summary>
/// Searches the automaton for a symbol sequence equal to <paramref name="word"/>,
/// followed by a separator. The result is a stem (decompressed accordingly
/// to the dictionary's specification) and an optional tag data.
/// </summary>
public IList <WordData> Lookup(ICharSequence word)
{
byte separator = dictionaryMetadata.Separator;
#pragma warning disable 612, 618
int prefixBytes = sequenceEncoder.PrefixBytes;
#pragma warning restore 612, 618
if (dictionaryMetadata.InputConversionPairs.Any())
{
word = ApplyReplacements(word, dictionaryMetadata.InputConversionPairs);
}
// Reset the output list to zero length.
formsList.Wrap(forms, 0, 0);
// Encode word characters into bytes in the same encoding as the FSA's.
charBuffer = BufferUtils.ClearAndEnsureCapacity(charBuffer, word.Length);
for (int i = 0; i < word.Length; i++)
{
char chr = word[i];
if (chr == separatorChar)
{
// No valid input can contain the separator.
return(formsList);
}
charBuffer.Put(chr);
}
charBuffer.Flip();
try
{
byteBuffer = BufferUtils.CharsToBytes(encoder, charBuffer, byteBuffer);
}
catch (UnmappableInputException)
{
// This should be a rare occurrence, but if it happens it means there is no way
// the dictionary can contain the input word.
return(formsList);
}
// Try to find a partial match in the dictionary.
MatchResult match = matcher.Match(matchResult, byteBuffer
.Array, 0, byteBuffer.Remaining, rootNode);
if (match.Kind == MatchResult.SequenceIsAPrefix)
{
/*
* The entire sequence exists in the dictionary. A separator should
* be the next symbol.
*/
int arc = fsa.GetArc(match.Node, separator);
/*
* The situation when the arc points to a final node should NEVER
* happen. After all, we want the word to have SOME base form.
*/
if (arc != 0 && !fsa.IsArcFinal(arc))
{
// There is such a word in the dictionary. Return its base forms.
int formsCount = 0;
finalStatesIterator.RestartFrom(fsa.GetEndNode(arc));
while (finalStatesIterator.MoveNext())
{
ByteBuffer bb = finalStatesIterator.Current;
byte[] ba = bb.Array;
int bbSize = bb.Remaining;
if (formsCount >= forms.Length)
{
//forms = Arrays.CopyOf(forms, forms.Length + EXPAND_SIZE);
Array.Resize(ref forms, forms.Length + ExpandSize);
for (int k = 0; k < forms.Length; k++)
{
if (forms[k] == null)
{
forms[k] = new WordData(decoder);
}
}
}
/*
* Now, expand the prefix/ suffix 'compression' and store
* the base form.
*/
WordData wordData = forms[formsCount++];
if (!dictionaryMetadata.OutputConversionPairs.Any())
{
wordData.Update(byteBuffer, word);
}
else
{
wordData.Update(byteBuffer, ApplyReplacements(word, dictionaryMetadata.OutputConversionPairs));
}
/*
* Find the separator byte's position splitting the inflection instructions
* from the tag.
*/
Debug.Assert(prefixBytes <= bbSize, sequenceEncoder.GetType() + " >? " + bbSize);
int sepPos;
for (sepPos = prefixBytes; sepPos < bbSize; sepPos++)
{
if (ba[sepPos] == separator)
{
break;
}
}
/*
* Decode the stem into stem buffer.
*/
wordData.stemBuffer = sequenceEncoder.Decode(wordData.stemBuffer,
byteBuffer,
ByteBuffer.Wrap(ba, 0, sepPos));
// Skip separator character.
sepPos++;
/*
* Decode the tag data.
*/
int tagSize = bbSize - sepPos;
if (tagSize > 0)
{
wordData.tagBuffer = BufferUtils.ClearAndEnsureCapacity(wordData.tagBuffer, tagSize);
wordData.tagBuffer.Put(ba, sepPos, tagSize);
wordData.tagBuffer.Flip();
}
}
formsList.Wrap(forms, 0, formsCount);
}
}
else
{
/*
* this case is somewhat confusing: we should have hit the separator
* first... I don't really know how to deal with it at the time
* being.
*/
}
return(formsList);
}