/**
* Organized the Applications of "d" into a leveled data structure based on their dependance among
* each other
*
* @return exactly the same Application instances in a leveled data structure
*/
private final List<Set<Rule.Match>> getTopology(List<Rule.Match> l) {
List<Set<Occurrence>> levels = new ArrayList<Set<Occurrence>>();
Occurrence initialWord = new Occurrence();
initialWord.setSymbol(l.get(0).rule.getLeftHandSide().get(0));
initialWord.setSource(null);
initialWord.setPosition(0);
ensureCapacity(1, levels);
levels.get(0).add(initialWord);
List<Occurrence> currentWord = new ArrayList<Occurrence>();
currentWord.add(initialWord);
for (int i = 0; i < l.size(); i++) {
Rule.Match a = l.get(i);
List<Occurrence> depSeq = dependingSubsequence(currentWord, a);
List<Occurrence> newWord = apply(currentWord, a);
List<Occurrence> prodSeq = producedSubsequence(newWord, a);
int myLevel = getMaxLevel(depSeq, levels) + 1;
ensureCapacity(myLevel + 1, levels);
Set<Occurrence> myLevelSet = levels.get(myLevel);
myLevelSet.addAll(prodSeq);
currentWord = newWord;
}
List<Set<Rule.Match>> result = new ArrayList<Set<Rule.Match>>();
for (Set<Occurrence> level : levels) {
Set<Rule.Match> set = new HashSet<Rule.Match>();
result.add(set);
for (Occurrence o : level) {
set.add(o.getSource());
}
}
return result;
}
/**
* applies "a" to the "word".
*
* @return the resulting word
*/
private final List<Occurrence> apply(List<Occurrence> word, Rule.Match a) {
Rule r = a.rule;
int length = word.size() - r.getLeftHandSide().length() + r.getRightHandSide().length();
int pos = a.leftHandSideStart;
List<Occurrence> result = new ArrayList<Occurrence>(length);
int rp = 0;
for (; rp < pos; rp++) {
result.add(word.get(rp));
}
Occurrence sourceOcc = word.get(rp + 1);
for (int i = 0; rp < pos + r.getRightHandSide().length(); rp++, i++) {
Occurrence o = new Occurrence();
o.setSymbol(r.getRightHandSide().get(i));
o.setSourceOccurrence(sourceOcc);
o.setPosition(rp);
o.setSource(a);
result.add(o);
}
for (int sp = pos + r.getLeftHandSide().length(); sp < word.size(); rp++, sp++) {
result.add(word.get(sp));
}
return result;
}
