/**
* Returns the specified function.
*
* @param name function qname
* @param args optional arguments
* @param ii input info
* @return function instance
* @throws QueryException query exception
*/
public StandardFunc get(final QNm name, final Expr[] args, final InputInfo ii)
throws QueryException {
final int id = id(name.id());
if (id == 0) return null;
// create function
final Function fl = funcs[id];
if (!eq(fl.uri(), name.uri())) return null;
final StandardFunc f = fl.get(ii, args);
// check number of arguments
if (args.length < fl.min || args.length > fl.max) XPARGS.thrw(ii, fl);
return f;
}
/**
* Throws an error if one of the pre-defined functions is similar to the specified function name.
*
* @param name function name
* @param ii input info
* @throws QueryException query exception
*/
public void error(final QNm name, final InputInfo ii) throws QueryException {
// compare specified name with names of predefined functions
final byte[] ln = name.local();
final Levenshtein ls = new Levenshtein();
for (int k = 1; k < size; ++k) {
final int i = indexOf(keys[k], '}');
final byte[] u = substring(keys[k], 2, i);
final byte[] l = substring(keys[k], i + 1);
if (eq(ln, l)) {
final byte[] ur = name.uri();
FUNSIMILAR.thrw(
ii,
new TokenBuilder(NSGlobal.prefix(ur)).add(':').add(l),
new TokenBuilder(NSGlobal.prefix(u)).add(':').add(l));
} else if (ls.similar(ln, l, 0)) {
FUNSIMILAR.thrw(ii, name.string(), l);
}
}
}
@Override
public void compile(final QueryContext ctx) throws QueryException {
if (compiled) return;
compiled = true;
if (check) {
final StaticFunc sf = ctx.funcs.get(name, args.length, info);
if (sf == null) throw Err.FUNCUNKNOWN.thrw(info, name.string());
type = sf.funcType().seqType();
}
final int fp = scope.enter(ctx);
try {
expr = expr.compile(ctx, scope);
expr.markTailCalls();
} finally {
scope.cleanUp(this);
scope.exit(ctx, fp);
}
}
/**
* Returns an instance of a with the specified name and number of arguments, or {@code null}.
*
* @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 static TypedFunc get(
final QNm name,
final Expr[] args,
final boolean dyn,
final QueryContext ctx,
final InputInfo ii)
throws QueryException {
// get namespace and local name
// parse data type constructors
if (eq(name.uri(), XSURI)) {
final byte[] ln = name.local();
final AtomType type = AtomType.find(name, false);
if (type == null) {
final Levenshtein ls = new Levenshtein();
for (final AtomType t : AtomType.values()) {
if (t.par != null
&& t != AtomType.NOT
&& t != AtomType.AAT
&& t != AtomType.BIN
&& ls.similar(lc(ln), lc(t.string()), 0))
FUNSIMILAR.thrw(ii, name.string(), t.string());
}
}
// no constructor function found, or abstract type specified
if (type == null || type == AtomType.NOT || type == AtomType.AAT) {
FUNCUNKNOWN.thrw(ii, name.string());
}
if (args.length != 1) FUNCTYPE.thrw(ii, name.string());
final SeqType to = SeqType.get(type, Occ.ZERO_ONE);
return TypedFunc.constr(new Cast(ii, args[0], to), to);
}
// pre-defined functions
final StandardFunc fun = Functions.get().get(name, args, ii);
if (fun != null) {
if (!ctx.sc.xquery3 && fun.xquery3()) FEATURE30.thrw(ii);
for (final Function f : Function.UPDATING) {
if (fun.sig == f) {
ctx.updating(true);
break;
}
}
return new TypedFunc(fun, fun.sig.type(args.length));
}
// user-defined function
final TypedFunc tf = ctx.funcs.get(name, args, ii);
if (tf != null) return tf;
// Java function (only allowed with administrator permissions)
final JavaMapping jf = JavaMapping.get(name, args, ctx, ii);
if (jf != null) return TypedFunc.java(jf);
// add user-defined function that has not been declared yet
if (!dyn && FuncType.find(name) == null) return ctx.funcs.add(name, args, ii, ctx);
// no function found
return null;
}
@Override
public String toString() {
return new TokenBuilder(name.string()).add('#').addExt(args.length).toString();
}
/**
* Returns the module namespace URI.
*
* @return URI
*/
public byte[] uri() {
return name.uri();
}
/**
* Checks if the specified item is a string or element.
*
* @param it item to be checked
* @return item
* @throws QueryException query exception
*/
private Item checkElmStr(final Item it) throws QueryException {
if (it instanceof AStr || TEST.eq(it)) return it;
throw ELMSTRTYPE.thrw(info, Q_ENTRY.string(), it.type);
}
