rangeReplaced method

PositionSeries rangeReplaced(int start, int end, Iterable<Position> replacements)

Returns a position series with positions from start (inclusive) to end (exclusive) replaced with replacements.

A returned series may point to the same position data as this (however implementations are allowed to make a copy of positions in the range).

Valid queries are such that 0 ≤ start ≤ end ≤ positionCount.

Implementation

PositionSeries rangeReplaced(
  int start,
  int end,
  Iterable<Position> replacements,
) {
  final source = positions;
  Iterable<Position>? target;
  if (start == end && replacements.isEmpty) {
    // ignore: avoid_returning_this
    return this;
  } else if (start == 0 && end == positionCount) {
    target = replacements;
  } else {
    if (start > 0) {
      target = source.take(start);
    }
    target = target != null ? target.followedBy(replacements) : replacements;
    if (end < positionCount) {
      target = target.followedBy(source.skip(end));
    }
  }
  return PositionSeries.from(target, type: coordType);
}