/** {@inheritDoc} */
@Override
public void toString(StringBuilder out, int indent) {
if (indent < 0) {
out.append(fun.label);
if (args.size() == 0) return;
out.append('[');
for (int i = 0; i < args.size(); i++) {
if (i > 0) out.append(", ");
args.get(i).toString(out, -1);
}
out.append(']');
} else {
for (int i = 0; i < indent; i++) {
out.append(' ');
}
out.append("call ")
.append(fun)
.append(" at position <")
.append(fun.pos)
.append("> with type=")
.append(type)
.append('\n');
for (Expr a : args) {
a.toString(out, indent + 2);
}
}
}
/**
* Returns true if we can determine the two expressions are equivalent; may sometimes return
* false.
*/
@Override
public boolean isSame(Expr obj) {
while (obj instanceof ExprUnary && ((ExprUnary) obj).op == ExprUnary.Op.NOOP)
obj = ((ExprUnary) obj).sub;
if (obj == this) return true;
if (!(obj instanceof ExprCall)) return false;
ExprCall x = (ExprCall) obj;
if (fun != x.fun || args.size() != x.args.size()) return false;
for (int i = 0; i < args.size(); i++) if (!args.get(i).isSame(x.args.get(i))) return false;
return true;
}
/** {@inheritDoc} */
@Override
public List<? extends Browsable> getSubnodes() {
if (args.size() == 0) {
Expr b = fun.getBody();
return Util.asList(make(b.pos(), b.span(), b.getHTML(), b.getSubnodes()));
}
Pos p = pos;
if (p == Pos.UNKNOWN) p = span();
Browsable f =
make(p, p, (fun.isPred ? "<b>pred</b> " : "<b>fun</b> ") + fun.label, fun.getSubnodes());
Browsable a =
make(
span(),
span(),
"<b>" + args.size() + " argument" + (args.size() == 1 ? "</b>" : "s</b>"),
args);
return Util.asList(f, a);
}
/**
* Constructs an ExprCall node with the given predicate/function "fun" and the list of arguments
* "args".
*/
public static Expr make(
Pos pos, Pos closingBracket, Func fun, List<Expr> args, long extraPenalty) {
if (extraPenalty < 0) extraPenalty = 0;
if (args == null) args = ConstList.make();
long weight = extraPenalty;
boolean ambiguous = false;
JoinableList<Err> errs = emptyListOfErrors;
TempList<Expr> newargs = new TempList<Expr>(args.size());
if (args.size() != fun.count()) {
errs =
errs.make(
new ErrorSyntax(
pos,
""
+ fun
+ " has "
+ fun.count()
+ " parameters but is called with "
+ args.size()
+ " arguments."));
}
for (int i = 0; i < args.size(); i++) {
final int a = (i < fun.count()) ? fun.get(i).type.arity() : 0;
final Expr x = args.get(i).typecheck_as_set();
ambiguous = ambiguous || x.ambiguous;
errs = errs.make(x.errors);
weight = weight + x.weight;
if (x.mult != 0)
errs = errs.make(new ErrorSyntax(x.span(), "Multiplicity expression not allowed here."));
if (a > 0 && x.errors.isEmpty() && !x.type.hasArity(a))
errs =
errs.make(
new ErrorType(
x.span(),
"This should have arity "
+ a
+ " but instead its possible type(s) are "
+ x.type));
newargs.add(x);
}
Type t = Type.FORMULA;
if (!fun.isPred && errs.size() == 0) {
final Type tt = fun.returnDecl.type;
try {
// This provides a limited form of polymorphic function,
// by using actual arguments at each call site to derive a tighter bound on the return
// value.
DeduceType d = new DeduceType();
for (int i = 0; i < args.size(); i++) {
ExprVar param = fun.get(i);
d.env.put(param, newargs.get(i).type.extract(param.type.arity()));
}
t = fun.returnDecl.accept(d);
if (t == null || t.is_int() || t.is_bool || t.arity() != tt.arity())
t = tt; // Just in case an error occurred...
} catch (Throwable ex) {
t = tt; // Just in case an error occurred...
}
}
return new ExprCall(
pos, closingBracket, ambiguous, t, fun, newargs.makeConst(), extraPenalty, weight, errs);
}