private void split(Sentence s, Interval clause, Intervals out) {
Interval pre = null, verb = null, post = null;
for (Interval phrase : s.get(Features.PHRASES).in(clause)) {
if (verb == null) {
if (phrase.get(Features.PHRASE_TYPE) == PhraseType.VerbPhrase)
verb = new Interval(phrase.low(), phrase.high());
else pre = expand(pre, phrase);
} else post = expand(post, phrase);
}
boolean preFocus = anyFocused(s, pre);
boolean verbFocus = anyFocused(s, verb);
boolean postFocus = anyFocused(s, post);
// heuristics from Hiyakumoto, Prevost and Cassell
if (!preFocus && !verbFocus && !postFocus) { // case 1
maybeAdd(out, Theme, pre);
maybeAdd(out, Rheme, verb, post);
} else if (preFocus && verbFocus && !postFocus) { // case 2
maybeAdd(out, Theme, pre);
maybeAdd(out, Rheme, verb, post);
} else if (preFocus && !verbFocus && postFocus) { // case 3
maybeAdd(out, Theme, pre, verb);
maybeAdd(out, Rheme, post);
} else if (!preFocus && verbFocus && postFocus) { // case 4
maybeAdd(out, Theme, pre, verb);
maybeAdd(out, Rheme, post);
} else if (preFocus && verbFocus && postFocus) { // case 5
maybeAdd(out, Theme, pre, verb);
maybeAdd(out, Rheme, post);
} else if (preFocus && !verbFocus && !postFocus) { // case 6
maybeAdd(out, Rheme, pre);
maybeAdd(out, Theme, verb, post);
} else if (!preFocus && verbFocus && !postFocus) { // case 7
maybeAdd(out, Theme, pre);
maybeAdd(out, Rheme, verb, post);
} else if (!preFocus && !verbFocus && postFocus) { // case 8
maybeAdd(out, Theme, pre, verb);
maybeAdd(out, Rheme, post);
}
}
public void process(Context c, Sentence s) {
Intervals infoStruct = new Intervals();
for (Interval clause : s.get(Features.CLAUSES)) split(s, clause, infoStruct);
s.set(Features.INFORMATION_STRUCTURE, infoStruct);
}
private boolean anyFocused(Sentence s, Interval i) {
return (i != null) && any(s.tokensIn(i), is_(Features.NEW));
}