/**
* This function obtains a list with the subexpressions of a given expressions
*
* @param expr The original expresion
* @return the list with all the subexpressions
*/
public static List<Expr> getListExpr(Expr expr) throws IllegalArgumentException {
List<Expr> list = new ArrayList<Expr>();
if (expr instanceof NumExpr) {
list.add(expr);
} else if (expr instanceof RefExpr) {
RefExpr refExpr = (RefExpr) expr;
String strRefExpr = refExpr.getZName().getWord();
// The \emptyset expression will be ignored
if (!strRefExpr.equals(UtilSymbols.emptySetSymbol())) list.add(expr);
} else if (expr instanceof SetExpr) {
list = ((SetExpr) expr).getZExprList();
} else if (expr instanceof TupleExpr) {
list = ((TupleExpr) expr).getZExprList();
} else if (expr instanceof ApplExpr) {
if (((ApplExpr) expr).getMixfix()) { // es una secuencia
ZExprListImpl applList =
(ZExprListImpl) ((SetExpr) (((ApplExpr) expr).getRightExpr())).getZExprList();
for (int i = 0; i < applList.size(); i++) {
Expr elem = (((TupleExpr) (applList.get(i))).getZExprList()).get(1);
list.add(elem);
}
} else { // es un valor negativo
list.add(expr);
}
} else {
throw new IllegalArgumentException();
}
return list;
}
public Boolean visitZName(ZName zName) {
String zNameWord = zName.toString();
return zNameWord.endsWith("!") || zNameWord.endsWith(UtilSymbols.primeSymbol());
}