H3Error H3_EXPORT()

in h3_directedEdge.c [258:294]

• 26 lines of code
• 5 McCabe index (conditional complexity)

H3Error H3_EXPORT(directedEdgeToBoundary)(H3Index edge, CellBoundary *cb) {
    // Get the origin and neighbor direction from the edge
    Direction direction = H3_GET_RESERVED_BITS(edge);
    H3Index origin;
    H3Error originResult = H3_EXPORT(getDirectedEdgeOrigin)(edge, &origin);
    if (originResult) {
        return originResult;
    }

    // Get the start vertex for the edge
    int startVertex = vertexNumForDirection(origin, direction);
    if (startVertex == INVALID_VERTEX_NUM) {
        // This is not actually an edge (i.e. no valid direction),
        // so return no vertices.
        cb->numVerts = 0;
        return E_DIR_EDGE_INVALID;
    }

    // Get the geo boundary for the appropriate vertexes of the origin. Note
    // that while there are always 2 topological vertexes per edge, the
    // resulting edge boundary may have an additional distortion vertex if it
    // crosses an edge of the icosahedron.
    FaceIJK fijk;
    H3Error fijkResult = _h3ToFaceIjk(origin, &fijk);
    if (NEVER(fijkResult)) {
        return fijkResult;
    }
    int res = H3_GET_RESOLUTION(origin);
    int isPent = H3_EXPORT(isPentagon)(origin);

    if (isPent) {
        _faceIjkPentToCellBoundary(&fijk, res, startVertex, 2, cb);
    } else {
        _faceIjkToCellBoundary(&fijk, res, startVertex, 2, cb);
    }
    return E_SUCCESS;
}