/**
* Applies aggregation to two NLGElements e1 and e2, succeeding only if they
* are clauses (that is, e1.getCategory() == e2.getCategory ==
* {@link simplenlg.framework.PhraseCategory#CLAUSE}).
*/
public override NLGElement apply(NLGElement previous, NLGElement next)
{
NLGElement aggregated = null;
if (previous.Category == PhraseCategory.PhraseCategoryEnum.CLAUSE && next.Category == PhraseCategory.PhraseCategoryEnum.CLAUSE && PhraseChecker.nonePassive(previous, next) && !PhraseChecker.expletiveSubjects(previous, next))
{
if (PhraseChecker.sameSentences(previous, next))
{ // case 1: identical sentences: remove the current
aggregated = previous;
}
else if (PhraseChecker.sameFrontMods(previous, next) && PhraseChecker.sameSubjects(previous, next) && PhraseChecker.samePostMods(previous, next))
{ // case 2: subjects identical: coordinate VPs
aggregated = factory.createClause();
aggregated.setFeature(InternalFeature.SUBJECTS, previous.getFeatureAsElementList(InternalFeature.SUBJECTS));
aggregated.setFeature(InternalFeature.FRONT_MODIFIERS, previous.getFeatureAsElement(InternalFeature.FRONT_MODIFIERS));
aggregated.setFeature(Feature.CUE_PHRASE, previous.getFeatureAsElement(Feature.CUE_PHRASE));
aggregated.setFeature(InternalFeature.POSTMODIFIERS, previous.getFeatureAsElementList(InternalFeature.POSTMODIFIERS));
NLGElement vp;
if (!PhraseChecker.sameVPArgs(previous, next) && PhraseChecker.sameVPHead(previous, next) && PhraseChecker.sameVPModifiers(previous, next))
{ // case 2.1: VPs have different arguments but same head & mods
NLGElement vp1 = previous.getFeatureAsElement(InternalFeature.VERB_PHRASE);
vp = factory.createVerbPhrase();
vp.setFeature(InternalFeature.HEAD, vp1.getFeatureAsElement(InternalFeature.HEAD));
vp.setFeature(InternalFeature.COMPLEMENTS, vp1.getFeatureAsElementList(InternalFeature.COMPLEMENTS));
vp.setFeature(InternalFeature.PREMODIFIERS, vp1.getFeatureAsElementList(InternalFeature.PREMODIFIERS));
vp.setFeature(InternalFeature.POSTMODIFIERS, vp1.getFeatureAsElementList(InternalFeature.POSTMODIFIERS));
}
else
{ // case 2.2: just create a coordinate vP
NLGElement vp1 = previous.getFeatureAsElement(InternalFeature.VERB_PHRASE);
NLGElement vp2 = next.getFeatureAsElement(InternalFeature.VERB_PHRASE);
vp = factory.createCoordinatedPhrase(vp1, vp2);
}
// case 2.3: expletive subjects
aggregated.setFeature(InternalFeature.VERB_PHRASE, vp);
}
else if (PhraseChecker.sameFrontMods(previous, next) && PhraseChecker.sameVP(previous, next) && PhraseChecker.samePostMods(previous, next))
{ // case 3: identical VPs: conjoin subjects and front modifiers
aggregated = factory.createClause();
aggregated.setFeature(InternalFeature.FRONT_MODIFIERS, previous.getFeatureAsElementList(InternalFeature.FRONT_MODIFIERS));
CoordinatedPhraseElement subjects = factory.createCoordinatedPhrase();
subjects.Category = new PhraseCategory(PhraseCategory.PhraseCategoryEnum.NOUN_PHRASE);
IList <NLGElement> allSubjects = previous.getFeatureAsElementList(InternalFeature.SUBJECTS);
((List <NLGElement>)allSubjects).AddRange(next.getFeatureAsElementList(InternalFeature.SUBJECTS));
foreach (NLGElement subj in allSubjects)
{
subjects.addCoordinate(subj);
}
aggregated.setFeature(InternalFeature.SUBJECTS, subjects);
aggregated.setFeature(InternalFeature.POSTMODIFIERS, previous.getFeatureAsElementList(InternalFeature.POSTMODIFIERS));
aggregated.setFeature(InternalFeature.VERB_PHRASE, previous.getFeature(InternalFeature.VERB_PHRASE));
}
}
return(aggregated);
}
/**
* Applies backward conjunction reduction to two NLGElements e1 and e2,
* succeeding only if they are clauses (that is, e1.getCategory() ==
* e2.getCategory == {@link simplenlg.framework.PhraseCategory#CLAUSE}).
*
* @param previous
* the first phrase
* @param next
* the second phrase
* @return a coordinate phrase if aggregation is successful,
* <code>null</code> otherwise
*/
public override NLGElement apply(NLGElement previous, NLGElement next)
{
bool success = false;
if (previous.Category == PhraseCategory.PhraseCategoryEnum.CLAUSE && next.Category == PhraseCategory.PhraseCategoryEnum.CLAUSE && PhraseChecker.nonePassive(previous, next))
{
IList <PhraseSet> rightPeriphery = PhraseChecker.rightPeriphery(previous, next);
foreach (PhraseSet pair in rightPeriphery)
{
if (pair.lemmaIdentical())
{
pair.elideLeftmost();
success = true;
}
}
}
return(success ? factory.createCoordinatedPhrase(previous, next) : null);
}
