private renderLinks()

in src/sankeyDiagram.ts [1756:1817]
51 lines of code
6 McCabe index (conditional complexity)

    private renderLinks(sankeyDiagramDataView: SankeyDiagramDataView): Selection<SankeyDiagramLink> {
        let linksElements: Selection<SankeyDiagramLink> = this.main
            .select(SankeyDiagram.LinksSelector.selectorName)
            .selectAll(SankeyDiagram.LinkSelector.selectorName);

        let linksSelectionData: UpdateSelection<SankeyDiagramLink> =
            linksElements
                .data(
                    sankeyDiagramDataView.links.filter((link: SankeyDiagramLink) => {
                        return link.height > SankeyDiagram.MinSize;
                    }).sort((a: SankeyDiagramLink, b: SankeyDiagramLink) => {
                        // sort links to draw forward links in the first, backward links draw as second and selflinks as the last
                        // in this case self links will be on front side
                        return a.direction < b.direction ? -1 : a.direction > b.direction ? 1 : 0;
                    })
                );

        linksSelectionData
            .exit()
            .remove();

        let linksElementsEnter = linksSelectionData
            .enter()
            .append("path");

        let linksElementsMerged = linksElementsEnter.merge(linksElements);

        linksElementsMerged
            .classed(SankeyDiagram.LinkSelector.className, true)
            .classed(SankeyDiagram.BackwardLinkSelector.className, (link: SankeyDiagramLink) => link.direction === SankeyLinkDirrections.Backward)
            .classed(SankeyDiagram.SelftLinkSelector.className, (link: SankeyDiagramLink) => link.direction === SankeyLinkDirrections.SelfLink);


        let minHeight = d3.min(sankeyDiagramDataView.links.map(l => l.height));

        linksElementsMerged
            .attr(
                "d", (link: SankeyDiagramLink) => {
                    if (link.direction === SankeyLinkDirrections.Forward) {
                        return this.getSvgPathForForwardLink(link);
                    }
                    if (link.direction === SankeyLinkDirrections.Backward) {
                        if (link.source.x + link.source.width > link.destination.x) {
                            return this.getSvgPathForForwardLink(link);
                        }
                        return this.getSvgPathForBackwardLink(link);
                    }
                    if (link.direction === SankeyLinkDirrections.SelfLink) {
                        return this.getSvgPathForSelfLink(link, minHeight);
                    }
                }
            )
            .attr(
                "id", (link: SankeyDiagramLink) => {
                    return SankeyDiagram.createLink(link);
                }
            )
            .style("stroke", (link: SankeyDiagramLink) => link.strokeColor)
            .style("fill", (link: SankeyDiagramLink) => link.fillColor);

        return linksElementsMerged;
    }