Function updateSegmentGroup

packages/router/src/create_url_tree.ts:383–411

(
  segmentGroup: UrlSegmentGroup | undefined,
  startIndex: number,
  commands: readonly any[],
)

}

function updateSegmentGroup(
  segmentGroup: UrlSegmentGroup | undefined,
  startIndex: number,
  commands: readonly any[],
): UrlSegmentGroup {
  segmentGroup ??= new UrlSegmentGroup([], {});
  if (segmentGroup.segments.length === 0 && segmentGroup.hasChildren()) {
    return updateSegmentGroupChildren(segmentGroup, startIndex, commands);
  }

  const m = prefixedWith(segmentGroup, startIndex, commands);
  const slicedCommands = commands.slice(m.commandIndex);
  if (m.match && m.pathIndex < segmentGroup.segments.length) {
    const g = new UrlSegmentGroup(segmentGroup.segments.slice(0, m.pathIndex), {});
    g.children[PRIMARY_OUTLET] = new UrlSegmentGroup(
      segmentGroup.segments.slice(m.pathIndex),
      segmentGroup.children,
    );
    return updateSegmentGroupChildren(g, 0, slicedCommands);
  } else if (m.match && slicedCommands.length === 0) {
    return new UrlSegmentGroup(segmentGroup.segments, {});
  } else if (m.match && !segmentGroup.hasChildren()) {
    return createNewSegmentGroup(segmentGroup, startIndex, commands);
  } else if (m.match) {
    return updateSegmentGroupChildren(segmentGroup, 0, slicedCommands);
  } else {
    return createNewSegmentGroup(segmentGroup, startIndex, commands);
  }
}

function updateSegmentGroupChildren(
  segmentGroup: UrlSegmentGroup,