Function FormatNestedLayerGraph

internal/layergraph/format.go:175–281

FormatNestedLayerGraph renders the layer graph as a Mermaid flowchart TB with nested subgraphs.

(
	c *checker.Checker,
	layerGraph *graph.Graph[LayerGraphNodeInfo, LayerGraphEdgeInfo],
	sf *ast.SourceFile,
)

// FormatNestedLayerGraph renders the layer graph as a Mermaid flowchart TB with nested subgraphs.
func FormatNestedLayerGraph(
	c *checker.Checker,
	layerGraph *graph.Graph[LayerGraphNodeInfo, LayerGraphEdgeInfo],
	sf *ast.SourceFile,
) string {
	var result []string

	// Create subgraph boxes for each node.
	for idx, nodeInfo := range layerGraph.Nodes() {
		var subgraphDefs []string

		for _, kind := range []string{"requires", "provides"} {
			var types []*checker.Type
			if kind == "requires" {
				types = nodeInfo.Requires
			} else {
				types = nodeInfo.Provides
			}

			var typeNodes []string
			for i, t := range types {
				typeName := getTypeDisplayName(c, t)
				typeNodes = append(typeNodes, fmt.Sprintf(`%d_%s_%d["%s"]`, idx, kind, i, mermaidSafe(typeName)))
			}

			if len(typeNodes) > 0 {
				kindLabel := "Requires"
				if kind == "provides" {
					kindLabel = "Provides"
				}
				subgraphDefs = append(subgraphDefs, fmt.Sprintf("subgraph %d_%s [%s]", idx, kind, kindLabel))
				for _, tn := range typeNodes {
					subgraphDefs = append(subgraphDefs, "  "+tn)
				}
				subgraphDefs = append(subgraphDefs, "end")
				subgraphDefs = append(subgraphDefs, fmt.Sprintf("style %d_%s stroke:none", idx, kind))
			}
		}

		// Wrap in inner wrap subgraph.
		var wrapped []string
		wrapped = append(wrapped, fmt.Sprintf(`subgraph %d_wrap[" "]`, idx))
		for _, line := range subgraphDefs {
			wrapped = append(wrapped, "  "+line)
		}
		wrapped = append(wrapped, "end")
		wrapped = append(wrapped, fmt.Sprintf("style %d_wrap fill:transparent", idx))
		wrapped = append(wrapped, fmt.Sprintf("style %d_wrap stroke:none", idx))

		// Get display node text and location.
		displayNode := nodeInfo.DisplayNode
		displaySourceFile := getNodeSourceFile(displayNode)
		nodeText := getNodeText(displayNode, displaySourceFile)
		location := formatLocation(displayNode, sf)

		// Outer subgraph.
		result = append(result, fmt.Sprintf("subgraph %d [\"`%s<br/><small>_%s_</small>`\"]", idx, mermaidSafe(nodeText), mermaidSafe(location)))
		for _, line := range wrapped {