@Override
public void seekExact(long ord) throws IOException {
// TODO: would be better to make this simpler and faster.
// but we dont want to introduce a bug that corrupts our enum state!
bytesReader.setPosition(0);
fst.getFirstArc(firstArc);
IntsRef output = Util.getByOutput(fst, ord, bytesReader, firstArc, scratchArc, scratchInts);
BytesRefBuilder scratchBytes = new BytesRefBuilder();
scratchBytes.clear();
Util.toBytesRef(output, scratchBytes);
// TODO: we could do this lazily, better to try to push into FSTEnum though?
in.seekExact(scratchBytes.get());
}
private Long lookupPrefix(BytesRef scratch, Arc<Long> arc) throws /*Bogus*/ IOException {
assert 0 == fst.outputs.getNoOutput().longValue();
long output = 0;
BytesReader bytesReader = fst.getBytesReader(0);
fst.getFirstArc(arc);
byte[] bytes = scratch.bytes;
int pos = scratch.offset;
int end = pos + scratch.length;
while (pos < end) {
if (fst.findTargetArc(bytes[pos++] & 0xff, arc, arc, bytesReader) == null) {
return null;
} else {
output += arc.output.longValue();
}
}
return output;
}
static <T> void walk(FST<T> fst) throws IOException {
final ArrayList<FST.Arc<T>> queue = new ArrayList<>();
final BitSet seen = new BitSet();
final FST.BytesReader reader = fst.getBytesReader();
final FST.Arc<T> startArc = fst.getFirstArc(new FST.Arc<T>());
queue.add(startArc);
while (!queue.isEmpty()) {
final FST.Arc<T> arc = queue.remove(0);
final long node = arc.target;
// System.out.println(arc);
if (FST.targetHasArcs(arc) && !seen.get((int) node)) {
seen.set((int) node);
fst.readFirstRealTargetArc(node, arc, reader);
while (true) {
queue.add(new FST.Arc<T>().copyFrom(arc));
if (arc.isLast()) {
break;
} else {
fst.readNextRealArc(arc, reader);
}
}
}
}
}
/** Load frame for start arc(node) on fst */
Frame loadFirstFrame(Frame frame) throws IOException {
frame.fstArc = fst.getFirstArc(frame.fstArc);
frame.fsaState = fsa.getInitialState();
return frame;
}
private void parse() throws IOException {
// System.out.println("\nS: parse");
assert inputSkipCount == 0;
int curNextRead = nextRead;
// Holds the longest match we've seen so far:
BytesRef matchOutput = null;
int matchInputLength = 0;
int matchEndOffset = -1;
BytesRef pendingOutput = fst.outputs.getNoOutput();
fst.getFirstArc(scratchArc);
assert scratchArc.output == fst.outputs.getNoOutput();
int tokenCount = 0;
byToken:
while (true) {
// Pull next token's chars:
final char[] buffer;
final int bufferLen;
// System.out.println(" cycle nextRead=" + curNextRead + " nextWrite=" + nextWrite);
int inputEndOffset = 0;
if (curNextRead == nextWrite) {
// We used up our lookahead buffer of input tokens
// -- pull next real input token:
if (finished) {
break;
} else {
// System.out.println(" input.incrToken");
assert futureInputs[nextWrite].consumed;
// Not correct: a syn match whose output is longer
// than its input can set future inputs keepOrig
// to true:
// assert !futureInputs[nextWrite].keepOrig;
if (input.incrementToken()) {
buffer = termAtt.buffer();
bufferLen = termAtt.length();
final PendingInput input = futureInputs[nextWrite];
lastStartOffset = input.startOffset = offsetAtt.startOffset();
lastEndOffset = input.endOffset = offsetAtt.endOffset();
inputEndOffset = input.endOffset;
// System.out.println(" new token=" + new String(buffer, 0, bufferLen));
if (nextRead != nextWrite) {
capture();
} else {
input.consumed = false;
}
} else {
// No more input tokens
// System.out.println(" set end");
finished = true;
break;
}
}
} else {
// Still in our lookahead
buffer = futureInputs[curNextRead].term.chars();
bufferLen = futureInputs[curNextRead].term.length();
inputEndOffset = futureInputs[curNextRead].endOffset;
// System.out.println(" old token=" + new String(buffer, 0, bufferLen));
}
tokenCount++;
// Run each char in this token through the FST:
int bufUpto = 0;
while (bufUpto < bufferLen) {
final int codePoint = Character.codePointAt(buffer, bufUpto, bufferLen);
if (fst.findTargetArc(
ignoreCase ? Character.toLowerCase(codePoint) : codePoint,
scratchArc,
scratchArc,
fstReader)
== null) {
// System.out.println(" stop");
break byToken;
}
// Accum the output
pendingOutput = fst.outputs.add(pendingOutput, scratchArc.output);
// System.out.println(" char=" + buffer[bufUpto] + " output=" + pendingOutput + "
// arc.output=" + scratchArc.output);
bufUpto += Character.charCount(codePoint);
}
// OK, entire token matched; now see if this is a final
// state:
if (scratchArc.isFinal()) {
matchOutput = fst.outputs.add(pendingOutput, scratchArc.nextFinalOutput);
matchInputLength = tokenCount;
matchEndOffset = inputEndOffset;
// System.out.println(" found matchLength=" + matchInputLength + " output=" + matchOutput);
}
// See if the FST wants to continue matching (ie, needs to
// see the next input token):
if (fst.findTargetArc(SynonymMap.WORD_SEPARATOR, scratchArc, scratchArc, fstReader) == null) {
// No further rules can match here; we're done
// searching for matching rules starting at the
// current input position.
break;
} else {
// More matching is possible -- accum the output (if
// any) of the WORD_SEP arc:
pendingOutput = fst.outputs.add(pendingOutput, scratchArc.output);
if (nextRead == nextWrite) {
capture();
}
}
curNextRead = rollIncr(curNextRead);
}
if (nextRead == nextWrite && !finished) {
// System.out.println(" skip write slot=" + nextWrite);
nextWrite = rollIncr(nextWrite);
}
if (matchOutput != null) {
// System.out.println(" add matchLength=" + matchInputLength + " output=" + matchOutput);
inputSkipCount = matchInputLength;
addOutput(matchOutput, matchInputLength, matchEndOffset);
} else if (nextRead != nextWrite) {
// Even though we had no match here, we set to 1
// because we need to skip current input token before
// trying to match again:
inputSkipCount = 1;
} else {
assert finished;
}
// System.out.println(" parse done inputSkipCount=" + inputSkipCount + " nextRead=" + nextRead
// + " nextWrite=" + nextWrite);
}