/** supports chains only */
public boolean hasOpposite(Formula formula) {
LispTree tree = formula.toLispTree();
if (tree.isLeaf()) {
String fbProperty =
FreebaseInfo.isReverseProperty(tree.value) ? tree.value.substring(1) : tree.value;
return freebaseInfo.fbPropertyHasOpposite(fbProperty);
} else {
// Un-reverse everything.
String binary1 = tree.child(2).child(0).value;
binary1 = FreebaseInfo.isReverseProperty(binary1) ? binary1.substring(1) : binary1;
String binary2 = tree.child(2).child(1).child(0).value;
binary2 = FreebaseInfo.isReverseProperty(binary2) ? binary2.substring(1) : binary2;
return freebaseInfo.fbPropertyHasOpposite(binary1)
&& freebaseInfo.fbPropertyHasOpposite(binary2);
}
}
public Formula equivalentFormula(LispTree tree) {
if (tree.isLeaf()) {
boolean rev = FreebaseInfo.isReverseProperty(tree.value);
String fbProperty = rev ? tree.value.substring(1) : tree.value;
String oppositeProperty = freebaseInfo.getOppositeFbProperty(fbProperty);
return rev
? Formulas.newNameFormula(oppositeProperty)
: Formulas.newNameFormula("!" + oppositeProperty);
} else {
String binary1 = tree.child(2).child(0).value;
binary1 = FreebaseInfo.isReverseProperty(binary1) ? binary1.substring(1) : binary1;
String binary2 = tree.child(2).child(1).child(0).value;
binary2 = FreebaseInfo.isReverseProperty(binary2) ? binary2.substring(1) : binary2;
String oppositeBinary1 = freebaseInfo.getOppositeFbProperty(binary1);
String oppositeBinary2 = freebaseInfo.getOppositeFbProperty(binary2);
boolean rev = FreebaseInfo.isReverseProperty(tree.child(2).child(0).value);
return buildLambdaFormula(oppositeBinary1, oppositeBinary2, !rev);
}
}
private void dumpExample(LispTree tree) {
out.println("(example");
for (LispTree subtree : tree.children.subList(1, tree.children.size())) {
if (!subtree.isLeaf() && "derivations".equals(subtree.children.get(0).value)) {
if (subtree.children.size() == 1) {
out.println(" (derivations)");
} else {
out.println(" (derivations");
for (LispTree derivation : subtree.children.subList(1, subtree.children.size())) {
out.write(" ");
derivation.print(Integer.MAX_VALUE, Integer.MAX_VALUE, out);
out.write("\n");
}
out.println(" )");
}
} else {
out.write(" ");
subtree.print(Integer.MAX_VALUE, Integer.MAX_VALUE, out);
out.write("\n");
}
}
out.println(")");
}
/** supports chains only */
public boolean isReversed(Formula formula) {
LispTree tree = formula.toLispTree();
if (tree.isLeaf()) return FreebaseInfo.isReverseProperty(tree.value);
else return FreebaseInfo.isReverseProperty(tree.child(2).child(0).value);
}