/**
* Adds a local function.
*
* @param fun function instance
* @param ii input info
* @return function id
* @throws QueryException query exception
*/
public int add(final UserFunc fun, final InputInfo ii) throws QueryException {
final QNm name = fun.name;
final byte[] uri = name.uri();
if (uri.length == 0) FUNNONS.thrw(ii, name.string());
if (NSGlobal.standard(uri)) {
if (fun.declared) NAMERES.thrw(ii, name.string());
funError(name, ii);
}
final byte[] ln = name.local();
for (int l = 0; l < func.length; ++l) {
final QNm qn = func[l].name;
final byte[] u = qn.uri();
final byte[] nm = qn.local();
if (eq(ln, nm) && eq(uri, u) && fun.args.length == func[l].args.length) {
// declare function that has been called before
if (!func[l].declared) {
func[l] = fun;
return l;
}
// duplicate declaration
FUNCDEFINED.thrw(ii, fun);
}
}
// add function skeleton
func = Array.add(func, fun);
calls = Array.add(calls, new UserFuncCall[0]);
return func.length - 1;
}
/**
* Finds similar function names and throws an error message.
*
* @param name function name
* @param ii input info
* @throws QueryException query exception
*/
public void funError(final QNm name, final InputInfo ii) throws QueryException {
// find global function
Functions.get().error(name, ii);
// find similar local function
final Levenshtein ls = new Levenshtein();
final byte[] nm = lc(name.local());
for (int n = 0; n < func.length; ++n) {
if (ls.similar(nm, lc(func[n].name.local()), 0)) {
FUNSIMILAR.thrw(ii, name.string(), func[n].name.string());
}
}
}
/**
* Returns the specified function.
*
* @param name name of the function
* @param args optional arguments
* @param dyn compile-/run-time flag
* @param ctx query context
* @param ii input info
* @return function instance
* @throws QueryException query exception
*/
public TypedFunc get(
final QNm name,
final Expr[] args,
final boolean dyn,
final QueryContext ctx,
final InputInfo ii)
throws QueryException {
// find function
final byte[] uri = name.uri();
final byte[] ln = name.local();
// parse data type constructors
if (eq(uri, XSURI)) {
final Type type = AtomType.find(name, true);
if (type == null || type == AtomType.NOT || type == AtomType.AAT) {
final Levenshtein ls = new Levenshtein();
for (final AtomType t : AtomType.values()) {
if (t.par != null && ls.similar(lc(ln), lc(t.string()), 0))
FUNSIMILAR.thrw(ii, name.string(), t.string());
}
FUNCUNKNOWN.thrw(ii, name.string());
}
if (args.length != 1) FUNCTYPE.thrw(ii, name.string());
final SeqType to = SeqType.get(type, SeqType.Occ.ZO);
return TypedFunc.constr(new Cast(ii, args[0], to), to);
}
// check Java functions - only allowed with administrator permissions
if (startsWith(uri, JAVAPRE) && ctx.context.user.perm(User.ADMIN)) {
final String c = string(substring(uri, JAVAPRE.length));
// convert dashes to upper-case initials
final TokenBuilder tb = new TokenBuilder().add(c).add('.');
boolean dash = false;
for (int p = 0; p < ln.length; p += cl(ln, p)) {
final int ch = cp(ln, p);
if (dash) {
tb.add(Character.toUpperCase(ch));
dash = false;
} else {
dash = ch == '-';
if (!dash) tb.add(ch);
}
}
final String java = tb.toString();
final int i = java.lastIndexOf(".");
final Class<?> cls = Reflect.find(java.substring(0, i));
if (cls == null) FUNCJAVA.thrw(ii, java);
final String mth = java.substring(i + 1);
return TypedFunc.java(new JavaFunc(ii, cls, mth, args));
}
// check predefined functions
final FuncCall fun = Functions.get().get(ln, uri, args, ctx, ii);
if (fun != null) {
for (final Function f : Function.UPDATING) {
if (fun.def == f) {
ctx.updating = true;
break;
}
}
return new TypedFunc(fun, fun.def.type(args.length));
}
// find local function
for (int l = 0; l < func.length; ++l) {
final QNm qn = func[l].name;
if (eq(ln, qn.local()) && eq(uri, qn.uri()) && args.length == func[l].args.length)
return new TypedFunc(add(ii, qn, l, args), FuncType.get(func[l]));
}
// add function call for function that has not been defined yet
if (!dyn && Types.find(name, false) == null) {
return new TypedFunc(
add(ii, name, add(new UserFunc(ii, name, new Var[args.length], null, false), ii), args),
FuncType.arity(args.length));
}
return null;
}