public /*@Nullable*/ String translate(IExpr expr) throws IVisitor.VisitorException {
Translator t = new Translator(typemap, smtConfig);
String r = expr.accept(t);
if (t.conjuncts.isEmpty()) return r;
String and = "(AND ";
for (String c : t.conjuncts) {
and = and + c + " ";
}
and = and + r + " )";
return and;
}
@Override
public IResponse get_value(IExpr... terms) {
TypeChecker tc = new TypeChecker(symTable);
try {
for (IExpr term : terms) {
term.accept(tc);
}
} catch (IVisitor.VisitorException e) {
tc.result.add(smtConfig.responseFactory.error(e.getMessage()));
} finally {
if (!tc.result.isEmpty()) return tc.result.get(0); // FIXME - report all errors?
}
// FIXME - do we really want to call get-option here? it involves going to the solver?
if (!Utils.TRUE.equals(get_option(smtConfig.exprFactory.keyword(Utils.PRODUCE_MODELS)))) {
return smtConfig.responseFactory.error(
"The get-value command is only valid if :produce-models has been enabled");
}
if (!smtConfig.responseFactory.sat().equals(checkSatStatus)
&& !smtConfig.responseFactory.unknown().equals(checkSatStatus)) {
return smtConfig.responseFactory.error(
"A get-value command is valid only after check-sat has returned sat or unknown");
}
return smtConfig.responseFactory.unsupported();
}
@Override
public String visit(IFcnExpr e) throws IVisitor.VisitorException {
boolean resultIsFormula = this.isFormula;
StringBuilder sb = new StringBuilder();
try {
Iterator<IExpr> iter = e.args().iterator();
if (!iter.hasNext())
throw new VisitorException("Did not expect an empty argument list", e.pos());
if (!(e.head() instanceof ISymbol)) {
throw new VisitorException(
"Have not yet implemented parameterized bit-vector functions", e.pos());
}
ISymbol fcn = (ISymbol) e.head();
String newName = fcn.accept(this);
// Determine if the arguments are formulas or terms
if (resultIsFormula) {
if (newName != null && logicNames.contains(newName)) {
// Propositional boolean item
this.isFormula = true;
} else if (e.args().size() <= 1) {
this.isFormula = false;
} else {
IExpr arg = e.args().get(1); // Use argument 1 for ite's sake
ISort sort = typemap.get(arg);
if (sort == null) {
throw new VisitorException(
"INTERNAL ERROR: Encountered an un-sorted expression node: "
+ smtConfig.defaultPrinter.toString(arg),
arg.pos());
}
if (sort.isBool()) {
// Some functions can take both bool and non-bool arguments:
// EQ NEQ DISTINCT ite
this.isFormula = resultIsFormula;
if ("EQ".equals(newName)) newName = "IFF";
} else {
// Arguments must be terms
this.isFormula = false;
}
}
} else {
this.isFormula = false;
}
ISort s = typemap.get(e);
if (s == null) {
throw new VisitorException(
"INTERNAL ERROR: Encountered an un-sorted expression node: "
+ smtConfig.defaultPrinter.toString(e),
e.pos());
}
if (s.isBool() && !resultIsFormula) {
throw new VisitorException(
"Use of boolean in a term position is not yet implemented in the Simplify adapter",
e.pos()); // FIXME - booleans as terms
}
if (isFormula && newName.equals("NEQ")) {
// for formulas, NEQ is (NOT (IFF p q ...))
// In simplify, IFF is not implicitly chainable
int length = e.args().size();
if ((length & 1) == 0) sb.append("(NOT ");
sb.append(leftassoc("IFF", length, iter));
if ((length & 1) == 0) sb.append(")");
} else if (newName.equals("IMPLIES")) {
// right-associative operators that need grouping
if (!iter.hasNext()) {
throw new VisitorException("implies (=>) operation without arguments", e.pos());
}
sb.append(rightassoc(newName, iter));
} else if (newName.equals("DISTINCT")) {
// in simplify, DISTINCT is just for term arguments but the result is a formula
if (isFormula) {
// arguments are formulas, result is formula
if (e.args().size() > 2) {
// More than two distinct boolean values?
sb.append("FALSE");
} else {
sb.append("(NOT (IFF");
while (iter.hasNext()) {
sb.append(" ");
sb.append(iter.next().accept(this));
}
sb.append(" ))");
}
} else if (resultIsFormula) {
// arguments are terms, result is formula - standard use in Simplify
sb.append("(DISTINCT");
while (iter.hasNext()) {
sb.append(" ");
sb.append(iter.next().accept(this));
}
sb.append(")");
} else {
// used in a term position
throw new VisitorException(
"Use of DISTINCT in a term position is not yet implemented in the Simplify adapter",
e.pos()); // FIXME - distinact as a term
}
} else if (ite_term.equals(newName)) {
if (isFormula) {
sb.append("(AND (IMPLIES ");
sb.append(e.args().get(0).accept(this));
sb.append(" ");
sb.append(e.args().get(1).accept(this));
sb.append(")");
sb.append("(IMPLIES (NOT ");
sb.append(e.args().get(0).accept(this));
sb.append(") ");
sb.append(e.args().get(2).accept(this));
sb.append("))");
}
}
if (e.args().size() > 2 && nonchainables.contains(newName)) {
Iterator<IExpr> iter2 = e.args().iterator();
sb.append("(AND ");
IExpr left = iter2.next();
while (iter2.hasNext()) {
IExpr right = iter2.next();
sb.append("(" + newName + " ");
sb.append(left.accept(this));
sb.append(" ");
sb.append(right.accept(this));
sb.append(")");
left = right;
}
sb.append(")");
}
if (e.args().size() > 2 && (newName.equals("-") || newName.equals("/"))) {
Iterator<IExpr> iter2 = e.args().iterator();
sb.append(leftassoc(newName, e.args().size(), iter2));
}
if (sb.length() == 0) {
sb.append("( ");
sb.append(newName);
while (iter.hasNext()) {
sb.append(" ");
sb.append(iter.next().accept(this));
}
sb.append(" )");
}
} finally {
this.isFormula = resultIsFormula;
}
return sb.toString();
}