Created
November 17, 2023 14:02
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Split String on markers and transform to hit ranges
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| String value = "fdkslaöfjs fdskla öfjs{{{{}}}}fjdslkajfs{{{{}}}} fdl söaj {{{{}}}}abc{{{{}}}} fdjksö jk"; | |
| String marker = "{{{{}}}}"; | |
| String[] parts = value.split(Pattern.quote(marker)); | |
| List<Integer> lengths = List.of(parts).stream().map(String::length).collect(Collectors.toList()); | |
| int total = 0; | |
| List<Integer> lengths_agg = List.of(parts).stream().map(String::length).map(l -> {total = total + l; return total;}).collect(Collectors.toList()); | |
| // https://stackoverflow.com/a/30072617/9360161 | |
| public static <T> Stream<List<T>> batches(List<T> source, int length) { | |
| if (length <= 0) { throw new IllegalArgumentException("length = " + length); } | |
| int size = source.size(); | |
| if (size <= 0) { return Stream.empty(); } | |
| int fullChunks = (size - 1) / length; | |
| return IntStream.range(0, fullChunks + 1).mapToObj(n -> source.subList(n * length, n == fullChunks ? size : (n + 1) * length)); | |
| } | |
| List<List<Integer>> groups = batches(lens, 2).collect(Collectors.toList()); | |
| groups.remove(groups.size() - 1); | |
| // inclusive indices | |
| List<List<Integer>> ranges = groups.stream().map(l -> List.of(l.get(0) + 1, l.get(1))).collect(Collectors.toList()); | |
| List<Integer[]> ranges = groups.stream().map(l -> new int[] {l.get(0) + 1, l.get(1)}).collect(Collectors.toList()); | |
| // lengths | |
| List<Integer[]> ranges = groups.stream().map(l -> new int[] {l.get(0) + 1, l.get(1) - l.get(0)}).collect(Collectors.toList()); |
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