@Override
public boolean unify() {
ProvaLiteral[] sourceLiterals = source.getBody();
// TODO: throw something
// if( sourceLiterals.length==0 )
// throw
ProvaLiteral sourceLiteral = sourceLiterals[source.getOffset()];
if (!matchMetadata(sourceLiteral, target)) return false;
ProvaLiteral targetLiteral = target.getHead();
ProvaPredicate sourcePredicate = sourceLiteral.getPredicate();
ProvaPredicate targetPredicate = targetLiteral.getPredicate();
return sourcePredicate.equals(targetPredicate) && sourceLiteral.unify(targetLiteral, this);
}
@Override
// TODO: recursive expressions as operands
public boolean process(
ProvaReagent prova,
ProvaDerivationNode node,
ProvaGoal goal,
List<ProvaLiteral> newLiterals,
ProvaRule query) {
ProvaLiteral literal = goal.getGoal();
List<ProvaVariable> variables = query.getVariables();
ProvaList terms = (ProvaList) literal.getTerms().cloneWithVariables(variables);
ProvaObject[] data = terms.getFixed();
if (data.length != 3) return false;
ProvaObject lt = data[0];
if (lt instanceof ProvaVariablePtr) {
ProvaVariablePtr varPtr = (ProvaVariablePtr) lt;
lt = variables.get(varPtr.getIndex()).getRecursivelyAssigned();
}
if (!((lt instanceof ProvaVariable) || (lt instanceof ProvaConstant))) return false;
ProvaObject a1 = data[1];
if (a1 instanceof ProvaVariablePtr) {
ProvaVariablePtr varPtr = (ProvaVariablePtr) a1;
a1 = variables.get(varPtr.getIndex()).getRecursivelyAssigned();
}
if (!(a1 instanceof ProvaConstant)) return false;
Object oa1 = ((ProvaConstant) a1).getObject();
if (!(oa1 instanceof Number)) return false;
ProvaObject a2 = data[2];
if (a2 instanceof ProvaVariablePtr) {
ProvaVariablePtr varPtr = (ProvaVariablePtr) a2;
a2 = variables.get(varPtr.getIndex()).getRecursivelyAssigned();
}
if (!(a2 instanceof ProvaConstant)) return false;
Object oa2 = ((ProvaConstant) a2).getObject();
if (!(oa2 instanceof Number)) return false;
Number na1 = (Number) oa1;
Number na2 = (Number) oa2;
Number result;
if (na1 instanceof Double || na2 instanceof Double)
result = na1.doubleValue() * na2.doubleValue();
else if (na1 instanceof Float || na2 instanceof Float)
result = na1.floatValue() * na2.floatValue();
else if (na1 instanceof Long || na2 instanceof Long) result = na1.longValue() * na2.longValue();
else if (na1 instanceof Integer || na2 instanceof Integer)
result = na1.intValue() * na2.intValue();
else result = na1.byteValue() * na2.byteValue();
if (lt instanceof ProvaConstant) return ((ProvaConstant) lt).getObject() == result;
((ProvaVariable) lt).setAssigned(ProvaConstantImpl.create(result));
return true;
}
@Override
public boolean process(
ProvaReagent prova,
ProvaDerivationNode node,
ProvaGoal goal,
List<ProvaLiteral> newLiterals,
ProvaRule query) {
ProvaLiteral literal = goal.getGoal();
List<ProvaVariable> variables = query.getVariables();
ProvaList terms = (ProvaList) literal.getTerms().cloneWithVariables(variables);
ProvaObject[] data = terms.getFixed();
if (data.length != 1 || !(data[0] instanceof ProvaList)) return false;
String symbol = ((ProvaConstant) ((ProvaList) data[0]).getFixed()[0]).getObject().toString();
ProvaLiteral lit = kb.generateLiteral(symbol, ((ProvaList) data[0]).getFixed(), 1);
// This automatically adds the rule to the respective predicate in the knowledge base
kb.generateRuleA(lit, new ProvaLiteral[] {});
return true;
}
private boolean matchMetadata(final ProvaLiteral sourceLiteral, final ProvaRule target) {
Map<String, List<Object>> sourceMetadata = sourceLiteral.getMetadata();
if (sourceMetadata == null || sourceMetadata.size() == 0)
// No source metadata or only line number
return true;
Map<String, List<Object>> targetMetadata = target.getMetadata();
if (targetMetadata == null) return false;
// All requested metadata must be found in the target
for (Entry<String, List<Object>> s : sourceMetadata.entrySet()) {
List<Object> value = targetMetadata.get(s.getKey());
List<Object> sValue = s.getValue();
if (value == null) return false;
boolean matched = false;
// Either of values in the source must be present in the list of values in the target
for (Object vo : value) {
if (!(vo instanceof String)) continue;
String v = (String) vo;
for (Object sVo : sValue) {
if (!(sVo instanceof String)) continue;
String sV = (String) sVo;
if (sV.length() != 0 && Character.isUpperCase(sV.charAt(0))) {
if (meta == null)
// Should not normally happen
return false;
for (ProvaList m : meta) {
ProvaObject[] mo = m.getFixed();
String varName = (String) ((ProvaConstant) mo[0]).getObject();
ProvaObject var = mo[1];
if (varName.equals(sV)) {
if (mo[1] instanceof ProvaVariablePtr) {
ProvaVariablePtr varPtr = (ProvaVariablePtr) var;
var = sourceVariables.get(varPtr.getIndex()).getRecursivelyAssigned();
}
if (var instanceof ProvaVariable) {
((ProvaVariable) var).setAssigned(ProvaConstantImpl.create(v));
matched = true;
break;
} else if (var instanceof ProvaConstant) {
// This allows for dynamic instantiation of metadata values from bound variables
sV = (String) ((ProvaConstant) var).getObject();
break;
}
}
}
}
if (matched) break;
if (v.equals(sV)) {
matched = true;
break;
}
}
if (matched) break;
}
if (!matched) return false;
}
return true;
}
