private static Relation constructGeneralTransitionRelation(Node node, List<String> ivc) {
Lustre2Sexp visitor = new Lustre2Sexp(1);
List<Sexp> conjuncts = new ArrayList<>();
LinkedBiMap<String, Symbol> ivcMap = createIvcMap(ivc);
for (Equation eq : node.equations) {
Sexp body = eq.expr.accept(visitor);
Sexp head = eq.lhs.get(0).accept(visitor);
Sexp sexp = new Cons("=", head, body);
String id = eq.lhs.get(0).id;
if (ivcMap.containsKey(id)) {
sexp = new Cons("=>", ivcMap.get(id), sexp);
}
conjuncts.add(sexp);
}
for (Expr assertion : node.assertions) {
conjuncts.add(assertion.accept(visitor));
}
List<VarDecl> inputs = new ArrayList<>();
inputs.add(new VarDecl(INIT.str, NamedType.BOOL));
inputs.addAll(visitor.pre(Util.getVarDecls(node)));
inputs.addAll(visitor.curr(Util.getVarDecls(node)));
return new Relation(Relation.T, inputs, SexpUtil.conjoin(conjuncts));
}
private static boolean propertiesExist(Program program) {
boolean exist = true;
for (Node node : program.nodes) {
Set<String> variables = new HashSet<>(Util.getIds(Util.getVarDecls(node)));
for (String prop : node.properties) {
if (!variables.contains(prop)) {
System.out.println(
"Error: property '" + prop + "' does not exist in node '" + node.id + "'");
exist = false;
}
}
}
return exist;
}
private static Set<String> getBooleans(Node node) {
Set<String> booleans = new HashSet<>();
for (VarDecl varDecl : Util.getVarDecls(node)) {
if (varDecl.type == NamedType.BOOL) {
booleans.add(varDecl.id);
}
}
return booleans;
}
private static boolean assignmentsSound(Node node) {
Set<String> toAssign = new HashSet<>();
toAssign.addAll(Util.getIds(node.outputs));
toAssign.addAll(Util.getIds(node.locals));
Set<String> assigned = new HashSet<>();
boolean sound = true;
for (Equation eq : node.equations) {
for (IdExpr idExpr : eq.lhs) {
if (toAssign.contains(idExpr.id)) {
toAssign.remove(idExpr.id);
assigned.add(idExpr.id);
} else if (assigned.contains(idExpr.id)) {
System.out.println(
"Error at line "
+ idExpr.location
+ " variable '"
+ idExpr.id
+ "' cannot be reassigned");
sound = false;
} else {
System.out.println(
"Error at line "
+ idExpr.location
+ " variable '"
+ idExpr.id
+ "' cannot be assigned");
sound = false;
}
}
}
if (!toAssign.isEmpty()) {
System.out.println("Error in node '" + node.id + "' variables must be assigned: " + toAssign);
sound = false;
}
return sound;
}
private static boolean variablesUnique(Node node) {
boolean unique = true;
Set<String> seen = new HashSet<>();
for (VarDecl decl : Util.getVarDecls(node)) {
if (seen.contains(decl.id)) {
System.out.println(
"Error at line " + decl.location + " variable " + decl.id + " already declared");
unique = false;
} else {
seen.add(decl.id);
}
}
return unique;
}