@Override
public int exprSize() {
int sz = 1;
for (final Let lt : copies) sz += lt.exprSize();
for (final Expr e : expr) sz += e.exprSize();
return sz;
}
@Override
public void checkUp() throws QueryException {
for (final Let c : copies) c.checkUp();
final Expr m = expr[0];
m.checkUp();
if (!m.isVacuous() && !m.has(Flag.UPD)) throw UPMODIFY.get(info);
checkNoUp(expr[1]);
}
/**
* Tests if the specified expressions are updating or vacuous.
*
* @param ctx query context
* @param expr expression array
* @throws QueryException query exception
*/
public void checkUp(final QueryContext ctx, final Expr... expr) throws QueryException {
if (!ctx.updating) return;
int s = 0;
for (final Expr e : expr) {
if (e.vacuous()) continue;
final boolean u = e.uses(Use.UPD);
if (u && s == 2 || !u && s == 1) UPNOT.thrw(input, desc());
s = u ? 1 : 2;
}
}
@Override
public Item item(final QueryContext qc, final InputInfo ii) throws QueryException {
final QNm name = toQNm(exprs[0], qc, sc, false);
final long arity = toLong(exprs[1], qc);
if (arity < 0 || arity > Integer.MAX_VALUE) throw FUNCUNKNOWN_X.get(ii, name);
try {
final Expr lit = Functions.getLiteral(name, (int) arity, qc, sc, ii);
return lit == null ? null : lit.item(qc, ii);
} catch (final QueryException e) {
// function not found (in most cases: XPST0017)
return null;
}
}
@Override
public Expr optimize(final QueryContext ctx, final VarScope scp) throws QueryException {
final int ar = expr.length - 1;
final Expr f = expr[ar];
final Type t = f.type().type;
if (t instanceof FuncType) {
final FuncType ft = (FuncType) t;
if (ft.args != null && ft.args.length != ar) throw INVARITY.get(info, f, ar);
if (ft.ret != null) type = ft.ret;
}
if (f instanceof XQFunctionExpr) {
// maps can only contain fully evaluated Values, so this is safe
if (allAreValues() && f instanceof Map) return optPre(value(ctx), ctx);
// try to inline the function
if (!(f instanceof FuncItem && comesFrom((FuncItem) f)) && !updating) {
final Expr[] args = Arrays.copyOf(expr, expr.length - 1);
final Expr inl = ((XQFunctionExpr) f).inlineExpr(args, ctx, scp, info);
if (inl != null) return inl;
}
}
return this;
}
/**
* Checks if the specified expression yields a string or empty sequence. Returns a token
* representation or an exception.
*
* @param e expression to be evaluated
* @param ctx query context
* @return item
* @throws QueryException query exception
*/
public final byte[] checkEStr(final Expr e, final QueryContext ctx) throws QueryException {
return checkEStr(e.item(ctx, input));
}
/**
* Checks if the specified expression yields a non-empty item.
*
* @param e expression to be evaluated
* @param ctx query context
* @return item
* @throws QueryException query exception
*/
public final Item checkItem(final Expr e, final QueryContext ctx) throws QueryException {
return checkEmpty(e.item(ctx, input));
}
/**
* Checks if the specified expression is an integer. Returns a token representation or an
* exception.
*
* @param e expression to be checked
* @param ctx query context
* @return integer value
* @throws QueryException query exception
*/
public final long checkItr(final Expr e, final QueryContext ctx) throws QueryException {
return checkItr(checkNoEmpty(e.item(ctx, input), AtomType.ITR));
}
/**
* Checks if the specified expression yields a double. Returns the double or throws an exception.
*
* @param e expression to be checked
* @param ctx query context
* @return double
* @throws QueryException query exception
*/
public final double checkDbl(final Expr e, final QueryContext ctx) throws QueryException {
final Item it = checkNoEmpty(e.item(ctx, input), AtomType.DBL);
if (!it.unt() && !it.num()) Err.number(this, it);
return it.dbl(input);
}
/**
* Checks if the specified expression yields a boolean. Returns the boolean or throws an
* exception.
*
* @param e expression to be checked
* @param ctx query context
* @return boolean
* @throws QueryException query exception
*/
public final boolean checkBln(final Expr e, final QueryContext ctx) throws QueryException {
final Item it = checkNoEmpty(e.item(ctx, input), AtomType.BLN);
if (!it.unt() && it.type != AtomType.BLN) Err.type(this, AtomType.BLN, it);
return it.bool(input);
}
/**
* Checks if the specified expressions is no updating expression.
*
* @param e expression
* @param ctx query context
* @return the specified expression
* @throws QueryException query exception
*/
public final Expr checkUp(final Expr e, final QueryContext ctx) throws QueryException {
if (e != null && ctx.updating && e.uses(Use.UPD)) UPNOT.thrw(input, desc());
return e;
}
/**
* Returns a boolean equivalent for the specified expression. If the specified expression yields a
* boolean value anyway, it will be returned as is. Otherwise, it will be wrapped into a boolean
* function.
*
* @param e expression to be rewritten
* @return expression
*/
protected final Expr compBln(final Expr e) {
return e.type().eq(SeqType.BLN) ? e : Function.BOOLEAN.get(input, e);
}