private static void preTerminals(Tree t, List<Tree> l) {
if (t.isPreTerminal()) {
l.add(t);
} else {
Tree[] kids = t.children();
for (int j = 0, n = kids.length; j < n; j++) {
preTerminals(kids[j], l);
}
}
}
private static void taggedLeafLabels(Tree t, List<CoreLabel> l) {
if (t.isPreTerminal()) {
CoreLabel fl = (CoreLabel) t.getChild(0).label();
fl.set(TagLabelAnnotation.class, t.label());
l.add(fl);
} else {
Tree[] kids = t.children();
for (int j = 0, n = kids.length; j < n; j++) {
taggedLeafLabels(kids[j], l);
}
}
}
static Tree getPreTerminal(Tree tree, MutableInteger i, int n) {
if (i.intValue() == n) {
if (tree.isPreTerminal()) {
return tree;
} else {
return getPreTerminal(tree.children()[0], i, n);
}
} else {
if (tree.isPreTerminal()) {
i.set(i.intValue() + tree.yield().size());
return null;
} else {
Tree[] kids = tree.children();
for (int j = 0; j < kids.length; j++) {
Tree result = getPreTerminal(kids[j], i, n);
if (result != null) {
return result;
}
}
return null;
}
}
}
public Tree transformTree(Tree tree) {
TreeFactory tf = tree.treeFactory();
String tag = tree.label().value();
if (tree.isPreTerminal()) {
String word = tree.firstChild().label().value();
List<Tree> newPreterms = new ArrayList<>();
for (int i = 0, size = word.length(); i < size; i++) {
String singleCharLabel = new String(new char[] {word.charAt(i)});
Tree newLeaf = tf.newLeaf(singleCharLabel);
String suffix;
if (useTwoCharTags) {
if (word.length() == 1 || i == 0) {
suffix = "_S";
} else {
suffix = "_M";
}
} else {
if (word.length() == 1) {
suffix = "_S";
} else if (i == 0) {
suffix = "_B";
} else if (i == word.length() - 1) {
suffix = "_E";
} else {
suffix = "_M";
}
}
newPreterms.add(tf.newTreeNode(tag + suffix, Collections.<Tree>singletonList(newLeaf)));
}
return tf.newTreeNode(tag, newPreterms);
} else {
List<Tree> newChildren = new ArrayList<>();
for (int i = 0; i < tree.children().length; i++) {
Tree child = tree.children()[i];
newChildren.add(transformTree(child));
}
return tf.newTreeNode(tag, newChildren);
}
}
