| 21 | */ |
| 22 | public class FnSlice extends StandardFunc { |
| 23 | @Override |
| 24 | public Value value(final QueryContext qc) throws QueryException { |
| 25 | Value input = arg(0).value(qc); |
| 26 | |
| 27 | final Slice slice = slice(input.size(), qc); |
| 28 | if(slice.length == 0) return Empty.VALUE; |
| 29 | if(slice.reverse) input = input.reverse(qc); |
| 30 | if(slice.step == 1) return input.subsequence(slice.start - 1, slice.length, qc); |
| 31 | |
| 32 | final ValueBuilder vb = new ValueBuilder(qc); |
| 33 | for(long i = slice.start; i <= slice.end; i += slice.step) { |
| 34 | vb.add(input.itemAt(i - 1)); |
| 35 | } |
| 36 | return vb.value(); |
| 37 | } |
| 38 | |
| 39 | @Override |
| 40 | protected Expr opt(final CompileContext cc) throws QueryException { |