/**
* *****************************************************************
*
* @return true if a quantifiers in a quantifier list is not found in the body of the statement.
*/
private static boolean quantifierNotInStatement(Formula f) {
if (f.theFormula == null || f.theFormula.length() < 1 || !f.listP() || f.empty()) return false;
if (!Arrays.asList("forall", "exists").contains(f.car())) {
Formula f1 = new Formula();
f1.read(f.car());
Formula f2 = new Formula();
f2.read(f.cdr());
return (quantifierNotInStatement(f1) || quantifierNotInStatement(f2));
}
Formula form = new Formula();
form.read(f.theFormula);
if (form.car() != null && form.car().length() > 0) { // This test shouldn't be needed.
String rest = form.cdr(); // Quantifier list plus rest of statement
Formula quant = new Formula();
quant.read(rest);
String q = quant.car(); // Now just the quantifier list.
String body = quant.cdr();
quant.read(q);
ArrayList<String> qList =
quant.argumentsToArrayList(0); // Put all the quantified variables into a list.
if (rest.indexOf("exists") != -1 || rest.indexOf("forall") != -1) { // nested quantifiers
Formula restForm = new Formula();
restForm.read(rest);
restForm.read(restForm.cdr());
if (quantifierNotInStatement(restForm)) return true;
}
for (int i = 0; i < qList.size(); i++) {
String var = (String) qList.get(i);
if (body.indexOf(var) == -1) return true;
}
}
return false;
}
/**
* ***************************************************************** Return a list of terms (for a
* given argument position) that do not have a specified relation.
*
* @param kb the knowledge base
* @param rel the relation name
* @param argnum the argument position of the term
* @param limit the maximum number of results to return, or -1 if all
* @param letter the first letter of the term name
*/
public static ArrayList<String> termsWithoutRelation(
KB kb, String rel, int argnum, int limit, char letter) {
ArrayList<String> result = new ArrayList<String>();
Iterator<String> it = kb.getTerms().iterator();
while (it.hasNext()) {
String term = it.next();
if (LOG_OPS.contains(term)
|| StringUtil.isNumeric(term)) // Exclude the logical operators and numbers
continue;
ArrayList<Formula> forms = kb.ask("arg", argnum, term);
if (forms == null || forms.isEmpty()) {
if (letter < 'A' || term.charAt(0) == letter) result.add(term);
} else {
boolean found = false;
Iterator<Formula> it2 = forms.iterator();
while (it2.hasNext()) {
Formula formula = (Formula) it2.next();
if (formula != null) {
String pred = formula.car();
if (pred.equals(rel)) {
found = true;
break;
}
} else
System.out.println(
"Error in Diagnostics.termsWithoutRelation(): null formula for: " + term);
}
if (!found) {
if (letter < 'A' || term.charAt(0) == letter) result.add(term);
}
}
if (limit > 0 && result.size() > limit) {
result.add("limited to " + limit + " results");
break;
}
}
return result;
}