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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.fsa.segmenter;
import java.util.LinkedList;
import java.util.ListIterator;
import com.yahoo.fsa.FSA;
/**
* API for accessing the Segmenter automata.
*
* @author Peter Boros
*/
public class Segmenter {
private final FSA fsa;
public Segmenter(FSA fsa) {
this.fsa = fsa;
}
public Segmenter(String filename) {
fsa = new FSA(filename, "utf-8");
}
public Segmenter(String filename, String charsetname) {
fsa = new FSA(filename, charsetname);
}
public boolean isOk() {
return fsa.isOk();
}
public Segments segment(String input) {
String[] tokens = input.split("\\s");
return segment(tokens);
}
private class Detector {
final FSA.State state;
final int index;
public Detector(FSA.State s, int i) {
state = s;
index = i;
}
public FSA.State state()
{
return state;
}
public int index()
{
return index;
}
}
public Segments segment(String[] tokens) {
Segments segments = new Segments(tokens);
LinkedList<Detector> detectors = new LinkedList<>();
int i=0;
while(i<tokens.length){
detectors.add(new Detector(fsa.getState(), i));
ListIterator<Detector> det_it = detectors.listIterator();
while(det_it.hasNext()){
Detector d = det_it.next();
d.state().deltaWord(tokens[i]);
if(d.state().isFinal()){
segments.add(new Segment(d.index(),i+1,d.state().data().getInt(0)));
}
if(!d.state().isValid()){
det_it.remove();
}
}
i++;
}
return segments;
}
}
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