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<h1><a href="index.html">All files</a> layout-engine.ts</h1>
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<span class="cline-any cline-no"> </span></td><td class="text"><pre class="prettyprint lang-js">import { FileNode, MermaidDiagramConfig } from './types.js';
export interface LayoutMetrics {
width: number; // Estimated diagram width in nodes
depth: number; // Maximum depth of the tree
density: number; // Connection density (edges per node)
clusters: number; // Number of distinct clusters
}
export interface LayoutStrategy {
direction: 'TB' | 'LR' | 'RL' | 'BT';
nodeSpacing: number;
rankSeparation: number;
autoRotate: boolean;
}
/**
* Calculates the width of the graph (maximum nodes at any level)
*/
<span class="cstat-no" title="statement not covered" >function calculateGraphWidth(nodes: FileNode[], groups: Map<string, FileNode[]>): number {</span>
// For grouped nodes, count groups as single nodes plus their internal max width
<span class="cstat-no" title="statement not covered" > const groupWidths = Array.from(groups.values()).map(groupNodes => {</span>
<span class="cstat-no" title="statement not covered" > const internalWidth = Math.max(</span>
<span class="cstat-no" title="statement not covered" > 1, // Minimum width is 1 (the group itself)</span>
<span class="cstat-no" title="statement not covered" > ...findLevels(groupNodes).map(level => level.length)</span>
<span class="cstat-no" title="statement not covered" > );</span>
<span class="cstat-no" title="statement not covered" > return internalWidth;</span>
<span class="cstat-no" title="statement not covered" > });</span>
// Also consider ungrouped nodes
<span class="cstat-no" title="statement not covered" > const ungroupedNodes = nodes.filter(node => </span>
<span class="cstat-no" title="statement not covered" > !Array.from(groups.values()).some(group => group.includes(node))</span>
<span class="cstat-no" title="statement not covered" > );</span>
<span class="cstat-no" title="statement not covered" > return Math.max(</span>
<span class="cstat-no" title="statement not covered" > ...groupWidths,</span>
<span class="cstat-no" title="statement not covered" > ungroupedNodes.length</span>
<span class="cstat-no" title="statement not covered" > );</span>
<span class="cstat-no" title="statement not covered" >}</span>
/**
* Calculates the maximum depth of the graph
*/
<span class="cstat-no" title="statement not covered" >function calculateGraphDepth(nodes: FileNode[], groups: Map<string, FileNode[]>): number {</span>
// For grouped nodes, count group as one level plus maximum internal depth
<span class="cstat-no" title="statement not covered" > const groupDepths = Array.from(groups.values()).map(groupNodes => {</span>
<span class="cstat-no" title="statement not covered" > return 1 + findLevels(groupNodes).length; // 1 for the group itself</span>
<span class="cstat-no" title="statement not covered" > });</span>
// Also consider paths through ungrouped nodes
<span class="cstat-no" title="statement not covered" > const ungroupedNodes = nodes.filter(node => </span>
<span class="cstat-no" title="statement not covered" > !Array.from(groups.values()).some(group => group.includes(node))</span>
<span class="cstat-no" title="statement not covered" > );</span>
<span class="cstat-no" title="statement not covered" > return Math.max(</span>
<span class="cstat-no" title="statement not covered" > ...groupDepths,</span>
<span class="cstat-no" title="statement not covered" > findLevels(ungroupedNodes).length</span>
<span class="cstat-no" title="statement not covered" > );</span>
<span class="cstat-no" title="statement not covered" >}</span>
/**
* Organizes nodes into levels based on dependencies
*/
<span class="cstat-no" title="statement not covered" >function findLevels(nodes: FileNode[]): FileNode[][] {</span>
<span class="cstat-no" title="statement not covered" > const levels: FileNode[][] = [];</span>
<span class="cstat-no" title="statement not covered" > const visited = new Set<string>();</span>
<span class="cstat-no" title="statement not covered" > function getNodeLevel(node: FileNode): number {</span>
<span class="cstat-no" title="statement not covered" > if (visited.has(node.path)) {</span>
// Return the existing level for this node
<span class="cstat-no" title="statement not covered" > return levels.findIndex(level => level.includes(node));</span>
<span class="cstat-no" title="statement not covered" > }</span>
<span class="cstat-no" title="statement not covered" > visited.add(node.path);</span>
// If no dependencies, this is a root node (level 0)
<span class="cstat-no" title="statement not covered" > if (!node.dependencies || node.dependencies.length === 0) {</span>
<span class="cstat-no" title="statement not covered" > if (!levels[0]) levels[0] = [];</span>
<span class="cstat-no" title="statement not covered" > levels[0].push(node);</span>
<span class="cstat-no" title="statement not covered" > return 0;</span>
<span class="cstat-no" title="statement not covered" > }</span>
// Find the maximum level of dependencies
<span class="cstat-no" title="statement not covered" > let maxDepLevel = -1;</span>
<span class="cstat-no" title="statement not covered" > for (const dep of node.dependencies) {</span>
<span class="cstat-no" title="statement not covered" > const depNode = nodes.find(n => n.path === dep);</span>
<span class="cstat-no" title="statement not covered" > if (depNode) {</span>
<span class="cstat-no" title="statement not covered" > maxDepLevel = Math.max(maxDepLevel, getNodeLevel(depNode));</span>
<span class="cstat-no" title="statement not covered" > }</span>
<span class="cstat-no" title="statement not covered" > }</span>
// This node's level is one more than its highest dependency
<span class="cstat-no" title="statement not covered" > const nodeLevel = maxDepLevel + 1;</span>
<span class="cstat-no" title="statement not covered" > if (!levels[nodeLevel]) levels[nodeLevel] = [];</span>
<span class="cstat-no" title="statement not covered" > levels[nodeLevel].push(node);</span>
<span class="cstat-no" title="statement not covered" > return nodeLevel;</span>
<span class="cstat-no" title="statement not covered" > }</span>
// Process all nodes
<span class="cstat-no" title="statement not covered" > nodes.forEach(node => getNodeLevel(node));</span>
<span class="cstat-no" title="statement not covered" > return levels;</span>
<span class="cstat-no" title="statement not covered" >}</span>
/**
* Calculates connection density (edges per node)
*/
<span class="cstat-no" title="statement not covered" >function calculateDensity(nodes: FileNode[]): number {</span>
<span class="cstat-no" title="statement not covered" > const totalEdges = nodes.reduce((count, node) => {</span>
<span class="cstat-no" title="statement not covered" > return count + (node.dependencies?.length || 0);</span>
<span class="cstat-no" title="statement not covered" > }, 0);</span>
<span class="cstat-no" title="statement not covered" > return totalEdges / nodes.length;</span>
<span class="cstat-no" title="statement not covered" >}</span>
/**
* Determines the optimal layout strategy based on graph metrics
*/
<span class="cstat-no" title="statement not covered" >export function determineOptimalLayout(</span>
<span class="cstat-no" title="statement not covered" > nodes: FileNode[],</span>
<span class="cstat-no" title="statement not covered" > groups: Map<string, FileNode[]>,</span>
<span class="cstat-no" title="statement not covered" > config?: Partial<MermaidDiagramConfig></span>
<span class="cstat-no" title="statement not covered" >): LayoutStrategy {</span>
// Calculate graph metrics
<span class="cstat-no" title="statement not covered" > const metrics: LayoutMetrics = {</span>
<span class="cstat-no" title="statement not covered" > width: calculateGraphWidth(nodes, groups),</span>
<span class="cstat-no" title="statement not covered" > depth: calculateGraphDepth(nodes, groups),</span>
<span class="cstat-no" title="statement not covered" > density: calculateDensity(nodes),</span>
<span class="cstat-no" title="statement not covered" > clusters: groups.size</span>
<span class="cstat-no" title="statement not covered" > };</span>
// Start with default values
<span class="cstat-no" title="statement not covered" > const strategy: LayoutStrategy = {</span>
<span class="cstat-no" title="statement not covered" > direction: 'TB',</span>
<span class="cstat-no" title="statement not covered" > nodeSpacing: 50,</span>
<span class="cstat-no" title="statement not covered" > rankSeparation: 50,</span>
<span class="cstat-no" title="statement not covered" > autoRotate: true</span>
<span class="cstat-no" title="statement not covered" > };</span>
// Adjust based on metrics
<span class="cstat-no" title="statement not covered" > if (metrics.width > metrics.depth * 2) {</span>
// Wide graph: use top-to-bottom layout
<span class="cstat-no" title="statement not covered" > strategy.direction = 'TB';</span>
<span class="cstat-no" title="statement not covered" > strategy.nodeSpacing = Math.max(30, Math.min(80, 150 / metrics.width));</span>
<span class="cstat-no" title="statement not covered" > strategy.rankSeparation = Math.max(40, Math.min(100, 200 / metrics.depth));</span>
<span class="cstat-no" title="statement not covered" > } else if (metrics.depth > metrics.width * 1.5) {</span>
// Deep graph: use left-to-right layout
<span class="cstat-no" title="statement not covered" > strategy.direction = 'LR';</span>
<span class="cstat-no" title="statement not covered" > strategy.nodeSpacing = Math.max(40, Math.min(100, 200 / metrics.depth));</span>
<span class="cstat-no" title="statement not covered" > strategy.rankSeparation = Math.max(30, Math.min(80, 150 / metrics.width));</span>
<span class="cstat-no" title="statement not covered" > } else {</span>
// Balanced graph: use density to decide
<span class="cstat-no" title="statement not covered" > if (metrics.density > 2) {</span>
// Dense connections: use more space
<span class="cstat-no" title="statement not covered" > strategy.nodeSpacing = 70;</span>
<span class="cstat-no" title="statement not covered" > strategy.rankSeparation = 70;</span>
<span class="cstat-no" title="statement not covered" > }</span>
<span class="cstat-no" title="statement not covered" > }</span>
// Override with any user-specified config
<span class="cstat-no" title="statement not covered" > if (config?.layout) {</span>
<span class="cstat-no" title="statement not covered" > if (config.layout.direction) strategy.direction = config.layout.direction;</span>
<span class="cstat-no" title="statement not covered" > if (config.layout.nodeSpacing) strategy.nodeSpacing = config.layout.nodeSpacing;</span>
<span class="cstat-no" title="statement not covered" > if (config.layout.rankSpacing) strategy.rankSeparation = config.layout.rankSpacing;</span>
<span class="cstat-no" title="statement not covered" > }</span>
<span class="cstat-no" title="statement not covered" > return strategy;</span>
<span class="cstat-no" title="statement not covered" >}</span>
// Export helper functions for testing
<span class="cstat-no" title="statement not covered" >export const layoutUtils = {</span>
<span class="cstat-no" title="statement not covered" > calculateGraphWidth,</span>
<span class="cstat-no" title="statement not covered" > calculateGraphDepth,</span>
<span class="cstat-no" title="statement not covered" > calculateDensity,</span>
<span class="cstat-no" title="statement not covered" > findLevels</span>
<span class="cstat-no" title="statement not covered" >}; </span></pre></td></tr></table></pre>
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at 2025-06-10T18:57:32.383Z
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