package org.basex.query.func;
import static org.basex.query.QueryText.*;
import java.io.IOException;
import org.basex.io.serial.Serializer;
import org.basex.query.QueryContext;
import org.basex.query.QueryException;
import org.basex.query.expr.Expr;
import org.basex.query.item.FuncItem;
import org.basex.query.item.FuncType;
import org.basex.query.item.SeqType;
import org.basex.query.item.Value;
import org.basex.query.iter.Iter;
import org.basex.query.util.Var;
import org.basex.util.InputInfo;
import org.basex.util.Token;
import org.basex.util.Util;
/**
* Inline function.
*
* @author BaseX Team 2005-12, BSD License
* @author Leo Woerteler
*/
public final class InlineFunc extends UserFunc {
/**
* Constructor.
* @param ii input info
* @param r return type
* @param argv arguments
* @param body function body
*/
public InlineFunc(final InputInfo ii, final SeqType r, final Var[] argv,
final Expr body) {
super(ii, null, argv, r, true);
expr = body;
}
@Override
public Expr comp(final QueryContext ctx) throws QueryException {
comp(ctx, false);
// only evaluate if the closure is empty, so we don't lose variables
return expr.hasFreeVars(ctx) ? this : optPre(item(ctx, input), ctx);
}
@Override
public FuncItem item(final QueryContext ctx, final InputInfo ii) {
final FuncType ft = FuncType.get(this);
final boolean c = ft.ret != null && !expr.type().instance(ft.ret);
return new FuncItem(args, expr, ft, ctx.vars.locals(), c);
}
@Override
public Value value(final QueryContext ctx) {
return item(ctx, input);
}
@Override
public Iter iter(final QueryContext ctx) {
return value(ctx).iter();
}
@Override
public boolean uses(final Use u) {
return u == Use.X30 || super.uses(u);
}
@Override
public boolean removable(final Var v) {
return false;
}
@Override
public Expr remove(final Var v) {
throw Util.notexpected(v);
}
@Override
public void plan(final Serializer ser) throws IOException {
ser.openElement(this);
for(int i = 0; i < args.length; ++i) {
ser.attribute(Token.token(ARG + i), args[i].name.string());
}
expr.plan(ser);
ser.closeElement();
}
@Override
public String toString() {
final StringBuilder sb = new StringBuilder(FUNCTION).append(PAR1);
for(int i = 0; i < args.length; i++) {
if(i > 0) sb.append(", ");
sb.append(args[i].toString());
}
sb.append(PAR2).append(' ');
if(ret != null) sb.append("as ").append(ret.toString()).append(' ');
return sb.append("{ ").append(expr).append(" }").toString();
}
@Override
boolean tco() {
return false;
}
}