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{ describe, expect, test } from "bun:test"import { parseColor, TextAttributes } from "@opentui/core"import stringWidth from "string-width"import { diagramArrowHeadBetween } from "../core/drawing.js"import { orthogonalPathPoints } from "../core/geometry.js"import { expectDiagram } from "../test/diagram.js"import { deploymentArchitectureSource } from "../test/layout-audit/fixtures.js"import { drawFlowchartDiagramGrid as drawParsedFlowchartDiagramGrid } from "./drawing.js"import { DEFAULT_MIN_RANK_GAP, DEFAULT_MIN_VERTICAL_RANK_GAP, layoutFlowchartDiagram as layoutParsedFlowchartDiagram, visualLength,} from "./layout.js"import { flowchartEdgeLabelLayout, flowchartRouteLabelLayout } from "./labels.js"import { parseMermaidFlowchartDiagram } from "./parser.js"import { renderFlowchartDiagram } from "./render.js"import { flowchartSourceConnector } from "./routing.js"import { renderGridStyledText, resolveFlowchartStyleColors } from "./style.js"
function drawFlowchartDiagramGrid(content: string, options?: Parameters<typeof drawParsedFlowchartDiagramGrid>[1]) { return drawParsedFlowchartDiagramGrid(parseMermaidFlowchartDiagram(content), options)}
function layoutFlowchartDiagram(content: string, options?: Parameters<typeof layoutParsedFlowchartDiagram>[1]) { return layoutParsedFlowchartDiagram(parseMermaidFlowchartDiagram(content), options)}
test("separates subgraph labels from their frame style", () => { const grid = drawFlowchartDiagramGrid(`flowchart LR subgraph Group A[Node] end`) const styles = grid.rows.flatMap((row) => row.map((cell) => cell.style))
expect(styles).toContain("group") expect(styles).toContain("groupLabel")})
test("keeps every branch connected at a shared source junction", () => { const source = `flowchart TB A --> B A --> C` const layout = layoutFlowchartDiagram(source, { compact: true }) const grid = drawFlowchartDiagramGrid(source, { compact: true }) const sourcePoint = layout.routes[0]!.points[0]!
expect(layout.routes[1]!.points[0]).toEqual(sourcePoint) expect(grid.getCell(sourcePoint.x, sourcePoint.y)?.char).toBe("┴")})
function routeRunsAlongHorizontalBorder( route: { points: readonly { x: number; y: number }[] }, bounds: { left: number; top: number; width: number; height: number },): boolean { const borderYs = new Set([bounds.top, bounds.top + bounds.height - 1]) const left = bounds.left const right = bounds.left + bounds.width - 1
for (let index = 1; index < route.points.length; index++) { const from = route.points[index - 1]! const to = route.points[index]! if (from.y !== to.y || !borderYs.has(from.y)) continue if (Math.min(Math.max(from.x, to.x), right) > Math.max(Math.min(from.x, to.x), left)) return true } return false}
function routeRunsAlongVerticalBorder( route: { points: readonly { x: number; y: number }[] }, bounds: { left: number; top: number; width: number; height: number },): boolean { const borderXs = new Set([bounds.left, bounds.left + bounds.width - 1]) const top = bounds.top const bottom = bounds.top + bounds.height - 1
for (let index = 1; index < route.points.length; index++) { const from = route.points[index - 1]! const to = route.points[index]! if (from.x !== to.x || !borderXs.has(from.x)) continue if (Math.min(Math.max(from.y, to.y), bottom) > Math.max(Math.min(from.y, to.y), top)) return true } return false}
function routeIntersectsBounds( route: { points: readonly { x: number; y: number }[] }, bounds: { left: number; top: number; width: number; height: number },): boolean { const right = bounds.left + bounds.width - 1 const bottom = bounds.top + bounds.height - 1 for (let index = 1; index < route.points.length; index++) { const from = route.points[index - 1]! const to = route.points[index]! if (from.x === to.x) { if ( from.x >= bounds.left && from.x <= right && Math.max(from.y, to.y) >= bounds.top && Math.min(from.y, to.y) <= bottom ) { return true } } else if ( from.y >= bounds.top && from.y <= bottom && Math.max(from.x, to.x) >= bounds.left && Math.min(from.x, to.x) <= right ) { return true } } return false}
function terminalPointsTowardBounds( route: { points: readonly { x: number; y: number }[] }, bounds: { left: number; top: number; width: number; height: number },): boolean { const before = route.points.at(-2)! const end = route.points.at(-1)! const right = bounds.left + bounds.width - 1 const bottom = bounds.top + bounds.height - 1 if (end.x === bounds.left - 1 && end.y >= bounds.top && end.y <= bottom) return before.x < end.x && before.y === end.y if (end.x === right + 1 && end.y >= bounds.top && end.y <= bottom) return before.x > end.x && before.y === end.y if (end.y === bounds.top - 1 && end.x >= bounds.left && end.x <= right) return before.y < end.y && before.x === end.x if (end.y === bottom + 1 && end.x >= bounds.left && end.x <= right) return before.y > end.y && before.x === end.x return false}
function boundsIntersect( left: { left: number; top: number; width: number; height: number }, right: { left: number; top: number; width: number; height: number },): boolean { return ( left.left <= right.left + right.width - 1 && left.left + left.width - 1 >= right.left && left.top <= right.top + right.height - 1 && left.top + left.height - 1 >= right.top )}
function boundsContains( outer: { left: number; top: number; width: number; height: number }, inner: { left: number; top: number; width: number; height: number },): boolean { return ( inner.left >= outer.left && inner.top >= outer.top && inner.left + inner.width <= outer.left + outer.width && inner.top + inner.height <= outer.top + outer.height )}
function routesIntersect( left: { points: readonly { x: number; y: number }[] }, right: { points: readonly { x: number; y: number }[] },): boolean { const occupied = new Set(orthogonalPathPoints(left.points).map((point) => `${point.x}:${point.y}`)) return orthogonalPathPoints(right.points).some((point) => occupied.has(`${point.x}:${point.y}`))}
function renderedDimensions(output: string): { width: number; height: number } { const lines = output.split("\n") return { width: Math.max(...lines.map((line) => stringWidth(line))), height: lines.length }}
function expectResponsiveFlowchartValid(content: string, layoutMaxWidth: number) { const diagram = parseMermaidFlowchartDiagram(content) const options = { compact: true, layoutMaxWidth } const layout = layoutParsedFlowchartDiagram(diagram, options) const grid = drawParsedFlowchartDiagramGrid(diagram, options) const output = renderFlowchartDiagram(content, options) const nodes = [...layout.bounds.values()]
expect(layout.diagram.direction).toBe("TD") for (let left = 0; left < nodes.length; left++) { for (let right = left + 1; right < nodes.length; right++) { expect(boundsIntersect(nodes[left]!, nodes[right]!)).toBe(false) } } for (const route of layout.routes) { expect(route.points.length).toBeGreaterThanOrEqual(2) for (let index = 1; index < route.points.length; index++) { const from = route.points[index - 1]! const to = route.points[index]! expect(from.x === to.x || from.y === to.y).toBe(true) } expect(terminalPointsTowardBounds(route, layout.bounds.get(route.edge.to)!)).toBe(true) const end = route.points.at(-1)! expect(grid.getCell(end.x, end.y)?.char).toBe(diagramArrowHeadBetween(route.points.at(-2)!, end)) if (route.edge.label) expect(output).toContain(route.edge.label) } expectFlowchartRoutesAvoidUnrelatedNodes(layout)
for (const subgraph of diagram.subgraphs ?? []) { const frame = layout.subgraphBounds.get(subgraph.id)! for (const nodeId of subgraph.nodeIds) expect(boundsContains(frame, layout.bounds.get(nodeId)!)).toBe(true) expect(output).toContain(subgraph.label) } for (const node of layout.bounds.values()) { for (const line of node.lines) expect(output).toContain(line) }
const widestContent = Math.max( ...nodes.map((node) => node.width), ...layout.routes.flatMap((route) => route.edge.label ? [flowchartRouteLabelLayout(route, visualLength).width] : [], ), ) const dimensions = renderedDimensions(output) expect(Math.max(...output.split("\n").map((line) => stringWidth(line)))).toBeLessThanOrEqual( layoutMaxWidth + widestContent + 4, ) return { dimensions, layout, output }}
function generatedWideRankFlowchart(count: number): string { const labels = [ "地域 gateway Ω", "界面 worker λ", "Long-running synchronization service", "Cache café 🚀", "Audit and observability pipeline", "Provider μ endpoint", "Fallback Ж service", "Archive 数据 lake", "Terminal résumé queue", ] const branches = labels .slice(0, count) .flatMap((label, index) => [ ` Hub ${index === 0 ? "-->|dispatch across regions and providers|" : "-->"} N${index}[${label}]`, ` N${index} --> Join`, ]) return [ "flowchart LR", " Start[Client α] --> Hub", " subgraph Services [地域 services Ω]", " Hub[Dispatch hub]", ...branches, " Join[Join results]", " end", " Join --> Done[Complete ✓]", ].join("\n")}
function expectFlowchartRoutesAvoidUnrelatedNodes(layout: ReturnType<typeof layoutFlowchartDiagram>): void { for (const route of layout.routes) { for (const [id, bounds] of layout.bounds) { if (id === route.edge.from || id === route.edge.to) continue expect(routeIntersectsBounds(route, bounds)).toBe(false) } }}
function expectFinalFlowchartLabelLayoutUnobstructed(layout: ReturnType<typeof layoutFlowchartDiagram>) { const labels = layout.routes.map((route) => { const label = flowchartRouteLabelLayout(route, visualLength) return { route, label, bounds: { left: label.point.x, top: label.point.y, width: label.width, height: label.height }, } })
for (const [index, label] of labels.entries()) { for (const bounds of layout.bounds.values()) expect(boundsIntersect(label.bounds, bounds)).toBe(false) for (const [otherIndex, other] of labels.entries()) { if (otherIndex !== index) expect(boundsIntersect(label.bounds, other.bounds)).toBe(false) } const textBounds = { ...label.bounds, left: label.bounds.left + 1, width: label.bounds.width - 2 } for (const other of layout.routes) { if (other === label.route) continue expect(routeIntersectsBounds(other, textBounds)).toBe(false) const source = layout.bounds.get(other.edge.from) const sourcePoint = other.points[0] if (!source || !sourcePoint) continue const connector = flowchartSourceConnector(source, sourcePoint) expect(boundsIntersect(label.bounds, { left: connector.x, top: connector.y, width: 1, height: 1 })).toBe(false) expect(boundsIntersect(label.bounds, { left: sourcePoint.x, top: sourcePoint.y, width: 1, height: 1 })).toBe( false, ) } } return labels}
function expectFlowchartLabelsUnobstructed(content: string): ReturnType<typeof layoutFlowchartDiagram> { const output = renderFlowchartDiagram(content) const layout = layoutFlowchartDiagram(content) const labels = expectFinalFlowchartLabelLayoutUnobstructed(layout) const grid = drawFlowchartDiagramGrid(content)
for (const label of labels) { const escaped = label.route.edge.label.replace(/[.*+?^${}()|[\]\\]/g, "\\$&") expect(output.match(new RegExp(`(?<![\\p{L}\\p{N}_])${escaped}(?![\\p{L}\\p{N}_])`, "gu")) ?? []).toHaveLength(1) for (const [lineIndex, line] of label.label.lines.entries()) { for (let offset = 0; offset < visualLength(line); offset++) { expect(grid.getCell(label.label.point.x + offset, label.label.point.y + lineIndex)?.style).toBe("label") } } } expectFlowchartRoutesAvoidUnrelatedNodes(layout) return layout}
describe("FlowchartDiagram", () => { test("renders compact horizontal flowcharts with shorter routes", () => { const output = renderFlowchartDiagram( `flowchart LR A[Idea] --> B[Parse] B --> C[Render] C --> D[Terminal]`, { compact: true }, )
expectDiagram(output).toEqualDiagram(` ╭──────╮ ╭───────╮ ╭────────╮ ╭──────────╮ │ Idea ├───▶│ Parse ├───▶│ Render ├───▶│ Terminal │ ╰──────╯ ╰───────╯ ╰────────╯ ╰──────────╯ `) })
test("renders compact vertical flowcharts with a readable arrow stem", () => { const output = renderFlowchartDiagram( `flowchart TD A[Start] --> B[Done]`, { compact: true }, )
expectDiagram(output).toEqualDiagram(` ╭───────╮ │ Start │ ╰───┬───╯ │ ▼ ╭──────╮ │ Done │ ╰──────╯ `) })
test("routes compact vertical sibling subtrees from their true parents", () => { const output = renderFlowchartDiagram( `flowchart TD D[DEPLOYMENT - Anomaly] --> CA[ClientApps: google, github] D --> O[ORG acme = guild/workspace] O --> OG[org grant: google, authed as bot@acme.com] O --> M[MEMBER juliana] M --> UG[user grant: google, personal]`, { compact: true }, )
expectDiagram(output).toEqualDiagram(` ╭──────────────────────╮ │ DEPLOYMENT - Anomaly │ ╰───────────┬──────────╯ ╭────────────────────┴────────────────────╮ ▼ ▼ ╭────────────────────────────╮ ╭────────────────────────────╮ │ ClientApps: google, github │ │ ORG acme = guild/workspace │ ╰────────────────────────────╯ ╰──────────────┬─────────────╯ ╭───────────────────────────────────┴───────╮ ▼ ▼ ╭───────────────────────────────────────────╮ ╭────────────────╮ │ org grant: google, authed as bot@acme.com │ │ MEMBER juliana │ ╰───────────────────────────────────────────╯ ╰────────┬───────╯ ╭────────────────────────────╯ ▼ ╭──────────────────────────────╮ │ user grant: google, personal │ ╰──────────────────────────────╯ `) })
test("routes vertical sibling subtrees from their true parents", () => { const output = renderFlowchartDiagram(`flowchart TD D[DEPLOYMENT - Anomaly] --> CA[ClientApps: google, github] D --> O[ORG acme = guild/workspace] O --> OG[org grant: google, authed as bot@acme.com] O --> M[MEMBER juliana] M --> UG[user grant: google, personal]`)
expectDiagram(output).toEqualDiagram(` ╭──────────────────────╮ │ DEPLOYMENT - Anomaly │ ╰───────────┬──────────╯ │ ╭────────────────────┴────────────────────╮ │ │ ▼ ▼ ╭────────────────────────────╮ ╭────────────────────────────╮ │ ClientApps: google, github │ │ ORG acme = guild/workspace │ ╰────────────────────────────╯ ╰──────────────┬─────────────╯ │ ╭───────────────────────────────────┴───────╮ │ │ ▼ ▼ ╭───────────────────────────────────────────╮ ╭────────────────╮ │ org grant: google, authed as bot@acme.com │ │ MEMBER juliana │ ╰───────────────────────────────────────────╯ ╰────────┬───────╯ │ ╭────────────────────────────╯ │ ▼ ╭──────────────────────────────╮ │ user grant: google, personal │ ╰──────────────────────────────╯ `) })
test("keeps Unicode node labels inside their measured frame", () => { const output = renderFlowchartDiagram(`flowchart LR A[界]`) const widths = output.split("\n").map((line) => stringWidth(line))
expect(new Set(widths).size).toBe(1) expect(output).toContain("界") })
test("does not mutate a parsed diagram when laying out with a direction override", () => { const diagram = parseMermaidFlowchartDiagram(`flowchart LR A --> B`)
layoutParsedFlowchartDiagram(diagram, { direction: "RL" })
expect(diagram.direction).toBe("LR") })
test("does not draw reverse-flow arrowheads on a target's opposite side", () => { const content = `flowchart RL Parser[Parser] --> Output[Rendered]` const output = renderFlowchartDiagram(content) const layout = layoutFlowchartDiagram(content) const outputBounds = layout.bounds.get("Output")! const renderedRow = output.split("\n").find((line) => line.includes("Rendered"))!
const horizontalRoute = layout.routes.find((route) => route.edge.from === "Parser" && route.edge.to === "Output")! expect(horizontalRoute.points.at(-1)?.x).toBe(outputBounds.left + outputBounds.width) expect(renderedRow).toContain("│ Rendered │◀") expect(renderedRow.trimStart().startsWith("◀")).toBe(false) })
test("preserves arrowheads for horizontal cycles", () => { const output = renderFlowchartDiagram(`flowchart LR A[A] --> B[B] B --> A`)
expectDiagram(output).toEqualDiagram(` ╭───────────╮ │ │ │ │ ▼ │ ╭───╮ ╭─┴─╮ │ A ├──────▶│ B │ ╰───╯ ╰───╯ `) })
test.each( (["LR", "RL", "TD", "TB", "BT"] as const).flatMap((direction) => [false, true].map((compact) => ({ direction, compact })), ), )( "preserves every target arrowhead after painting $direction routes with compact=$compact", ({ direction, compact }) => { const content = `flowchart ${direction} A[A] B[B] C[C] D[D] A --> A A --> C C --> B` const diagram = parseMermaidFlowchartDiagram(content) const layout = layoutParsedFlowchartDiagram(diagram, { compact }) const grid = drawParsedFlowchartDiagramGrid(diagram, { compact })
for (const route of layout.routes) { const end = route.points.at(-1)! expect(grid.getCell(end.x, end.y)?.char).toBe(diagramArrowHeadBetween(route.points.at(-2)!, end)) } }, )
test.each( (["LR", "RL", "TD", "TB", "BT"] as const).flatMap((direction) => [false, true].map((compact) => ({ direction, compact })), ), )("keeps crossed endpoint-disjoint $direction routes separate with compact=$compact", ({ direction, compact }) => { const layout = layoutFlowchartDiagram( `flowchart ${direction} A[A] B[B] C[C] D[D] A --> C D --> B`, { compact }, )
expect(layout.routes).toHaveLength(2) expect(routesIntersect(layout.routes[0]!, layout.routes[1]!)).toBe(false) })
test("keeps vertical feedback labels clear of unrelated nodes", () => { const content = `flowchart TD S[Source] --> A[Alpha] S --> B{Beta?} S --> C[(Store)] A --> J[[Join]] B --> J C --> J J -->|cycle back| S` const layout = layoutFlowchartDiagram(content) const feedback = layout.routes.find((route) => route.edge.from === "J" && route.edge.to === "S")! const label = flowchartEdgeLabelLayout(feedback.points, feedback.edge.label, stringWidth) const labelBounds = { left: label.point.x, top: label.point.y, width: label.width, height: label.height }
for (const id of ["A", "B", "C"]) expect(boundsIntersect(labelBounds, layout.bounds.get(id)!)).toBe(false) expect(renderFlowchartDiagram(content)).toContain("cycle back") })
test("routes horizontal feedback edges around sibling nodes", () => { for (const direction of ["LR", "RL"] as const) { const layout = layoutFlowchartDiagram(`flowchart ${direction} S[Start] --> D{Ready?} D --> O[Output] D --> R[Retry] R --> S`) const feedback = layout.routes.find((route) => route.edge.from === "R" && route.edge.to === "S")!
expect(routeIntersectsBounds(feedback, layout.bounds.get("O")!)).toBe(false) } })
test("keeps compact vertical fan-in arrowheads pointed at the target", () => { const content = `flowchart TD A[Left] -->|left| C[Merge] B[Right] -->|right| C` const layout = layoutFlowchartDiagram(content, { compact: true })
for (const route of layout.routes) { const beforeTarget = route.points.at(-2)! const target = route.points.at(-1)! expect(beforeTarget.x).toBe(target.x) expect(beforeTarget.y).toBeLessThan(target.y) } expect(renderFlowchartDiagram(content, { compact: true })).toContain("▼") })
test("routes same-rank vertical-flow edges into the target side", () => { const layout = layoutFlowchartDiagram(`flowchart TD B[Start] --> D{Choose} D --> E[[Primary]] D --> F[Fallback] E --> B F --> E`) const route = layout.routes.find((candidate) => candidate.edge.from === "F" && candidate.edge.to === "E")! const beforeTarget = route.points.at(-2)! const target = route.points.at(-1)!
expect(beforeTarget.y).toBe(target.y) expect(beforeTarget.x).toBeGreaterThan(target.x) })
test("renders parallel same-endpoint edges without losing labels", () => { const content = `flowchart LR A[Source] -->|first| B[Target] A -->|second| B` const output = renderFlowchartDiagram(content) const parallel = layoutFlowchartDiagram(content).routes
expect(output).toContain("first") expect(output).toContain("second") expect(output).toMatch(/[▲▼◀▶]/) expect(new Set(parallel.map((route) => JSON.stringify(route.points))).size).toBe(2) })
test("keeps reciprocal edge labels disjoint from nodes, labels, and other routes", () => { const content = `flowchart TD A[A] -->|forward_label| B[B] B -->|backward_label| A`
expectFlowchartLabelsUnobstructed(content) })
test("keeps labeled parallel BT edges on distinct unobstructed routes", () => { const content = `flowchart BT F3_1[Node F3_1] F3_4[Node F3_4] F3_3[Node F3_3] F3_2[Node F3_2] F3_3 -->|flow_edge_3_0| F3_4 F3_2 -->|flow_edge_3_1| F3_3 F3_1 -->|flow_edge_3_5| F3_4 F3_1 -->|flow_edge_3_6| F3_4 F3_2 -->|flow_edge_3_7| F3_1 F3_1 -->|flow_edge_3_8| F3_4` const layout = expectFlowchartLabelsUnobstructed(content) const parallel = layout.routes.filter((route) => route.edge.from === "F3_1" && route.edge.to === "F3_4")
expect(parallel).toHaveLength(3) expect(new Set(parallel.map((route) => JSON.stringify(route.points))).size).toBe(3) })
test("keeps every label in the cyclic parallel BT fuzz fixture", () => { const content = `flowchart BT F3_0[Node F3_0] F3_1[Node F3_1] F3_2[Node F3_2] F3_3[Node F3_3] F3_4[Node F3_4] F3_0 -->|flow_edge_3_0| F3_1 F3_1 -->|flow_edge_3_1| F3_2 F3_2 -->|flow_edge_3_2| F3_3 F3_3 -->|flow_edge_3_3| F3_4 F3_0 -->|flow_edge_3_4| F3_4 F3_0 -->|flow_edge_3_5| F3_0 F3_1 -->|flow_edge_3_6| F3_4 F3_3 -->|flow_edge_3_7| F3_0 F3_1 -->|flow_edge_3_8| F3_4 F3_3 -->|flow_edge_3_9| F3_0`
expectFlowchartLabelsUnobstructed(content) })
test("keeps every label in the cyclic parallel TB fuzz fixture", () => { const content = `flowchart TB F9_0[Node F9_0] F9_1[Node F9_1] F9_2[Node F9_2] F9_3[Node F9_3] F9_4[Node F9_4] F9_5[Node F9_5] F9_6[Node F9_6] F9_0 -->|flow_edge_9_0| F9_1 F9_1 -->|flow_edge_9_1| F9_2 F9_2 -->|flow_edge_9_2| F9_3 F9_3 -->|flow_edge_9_3| F9_4 F9_4 -->|flow_edge_9_4| F9_5 F9_5 -->|flow_edge_9_5| F9_6 F9_2 -->|flow_edge_9_6| F9_3 F9_1 -->|flow_edge_9_7| F9_0 F9_5 -->|flow_edge_9_8| F9_6 F9_6 -->|flow_edge_9_9| F9_3 F9_0 -->|flow_edge_9_10| F9_1 F9_1 -->|flow_edge_9_11| F9_5`
expectFlowchartLabelsUnobstructed(content) })
test("keeps routes outside unrelated nodes in the cyclic TB fuzz fixture", () => { const content = `flowchart TB F7_0[Node F7_0] F7_1[Node F7_1] F7_2[Node F7_2] F7_3[Node F7_3] F7_4[Node F7_4] F7_5[Node F7_5] F7_6[Node F7_6] F7_7[Node F7_7] F7_0 -->|flow_edge_7_0| F7_1 F7_1 -->|flow_edge_7_1| F7_2 F7_2 -->|flow_edge_7_2| F7_3 F7_3 -->|flow_edge_7_3| F7_4 F7_4 -->|flow_edge_7_4| F7_5 F7_5 -->|flow_edge_7_5| F7_6 F7_6 -->|flow_edge_7_6| F7_7 F7_7 -->|flow_edge_7_7| F7_2 F7_3 -->|flow_edge_7_8| F7_3 F7_0 -->|flow_edge_7_9| F7_4 F7_5 -->|flow_edge_7_10| F7_6 F7_4 -->|flow_edge_7_11| F7_2`
expectFlowchartLabelsUnobstructed(content) })
test("keeps every label clear in the cyclic BT fuzz fixture", () => { const content = `flowchart BT F130_0[Node F130_0] F130_1[Node F130_1] F130_2[Node F130_2] F130_3[Node F130_3] F130_4[Node F130_4] F130_5[Node F130_5] F130_0 -->|flow_edge_130_0| F130_1 F130_1 -->|flow_edge_130_1| F130_2 F130_2 -->|flow_edge_130_2| F130_3 F130_3 -->|flow_edge_130_3| F130_4 F130_4 -->|flow_edge_130_4| F130_5 F130_2 -->|flow_edge_130_5| F130_1 F130_4 -->|flow_edge_130_6| F130_3 F130_3 -->|flow_edge_130_7| F130_1 F130_5 -->|flow_edge_130_8| F130_5 F130_2 -->|flow_edge_130_9| F130_0 F130_4 -->|flow_edge_130_10| F130_0 F130_4 -->|flow_edge_130_11| F130_0`
expectFlowchartLabelsUnobstructed(content) })
test("keeps translated top feedback labels distinct in the cyclic BT fuzz fixture", () => { const content = `flowchart BT F141_0[Node F141_0] F141_1[Node F141_1] F141_2[Node F141_2] F141_3[Node F141_3] F141_4[Node F141_4] F141_5[Node F141_5] F141_6[Node F141_6] F141_7[Node F141_7] F141_0 -->|flow_edge_141_0| F141_1 F141_1 -->|flow_edge_141_1| F141_2 F141_2 -->|flow_edge_141_2| F141_3 F141_3 -->|flow_edge_141_3| F141_4 F141_4 -->|flow_edge_141_4| F141_5 F141_5 -->|flow_edge_141_5| F141_6 F141_6 -->|flow_edge_141_6| F141_7 F141_7 -->|flow_edge_141_7| F141_1 F141_4 -->|flow_edge_141_8| F141_4 F141_3 -->|flow_edge_141_9| F141_0 F141_3 -->|flow_edge_141_10| F141_2 F141_7 -->|flow_edge_141_11| F141_6 F141_7 -->|flow_edge_141_12| F141_2 F141_7 -->|flow_edge_141_13| F141_5`
expectFlowchartLabelsUnobstructed(content) })
test("keeps feedback labels outside their endpoint nodes in the cyclic BT fuzz fixture", () => { const content = `flowchart BT F223_0[Node F223_0] F223_1[Node F223_1] F223_2[Node F223_2] F223_3[Node F223_3] F223_4[Node F223_4] F223_5[Node F223_5] F223_6[Node F223_6] F223_0 -->|flow_edge_223_0| F223_1 F223_1 -->|flow_edge_223_1| F223_2 F223_2 -->|flow_edge_223_2| F223_3 F223_3 -->|flow_edge_223_3| F223_4 F223_4 -->|flow_edge_223_4| F223_5 F223_5 -->|flow_edge_223_5| F223_6 F223_5 -->|flow_edge_223_6| F223_2 F223_2 -->|flow_edge_223_7| F223_6 F223_3 -->|flow_edge_223_8| F223_6`
expectFlowchartLabelsUnobstructed(content) })
test("keeps self-loop labels outside their node in the cyclic TB fuzz fixture", () => { const content = `flowchart TB F238_0[Node F238_0] F238_1[Node F238_1] F238_2[Node F238_2] F238_3[Node F238_3] F238_4[Node F238_4] F238_5[Node F238_5] F238_0 -->|flow_edge_238_0| F238_1 F238_1 -->|flow_edge_238_1| F238_2 F238_2 -->|flow_edge_238_2| F238_3 F238_3 -->|flow_edge_238_3| F238_4 F238_4 -->|flow_edge_238_4| F238_5 F238_1 -->|flow_edge_238_5| F238_2 F238_3 -->|flow_edge_238_6| F238_3 F238_2 -->|flow_edge_238_7| F238_0 F238_1 -->|flow_edge_238_8| F238_5 F238_1 -->|flow_edge_238_9| F238_1 F238_4 -->|flow_edge_238_10| F238_4 F238_4 -->|flow_edge_238_11| F238_0 F238_2 -->|flow_edge_238_12| F238_2`
expectFlowchartLabelsUnobstructed(content) })
test.each(["LR", "RL", "TD", "TB", "BT"] as const)( "keeps multiple %s self-loop labels clear amid surrounding cycles", (direction) => { const content = `flowchart ${direction} A[Alpha] -->|entry_${direction}| B[Beta] B -->|loop_${direction}_0| B B -->|loop_${direction}_1| B B -->|loop_${direction}_2| B B -->|exit_${direction}| C[Gamma] C -->|cycle_${direction}| A` const layout = expectFlowchartLabelsUnobstructed(content) const loops = layout.routes.filter((route) => route.edge.from === "B" && route.edge.to === "B")
expect(loops).toHaveLength(3) expect(new Set(loops.map((route) => JSON.stringify(route.points))).size).toBe(3) }, )
test.each( (["LR", "RL", "TD", "TB", "BT"] as const).flatMap((direction) => ([2, 3, 4] as const).map((count) => ({ direction, count })), ), )("keeps $count parallel $direction labels clear amid surrounding cycles", ({ direction, count }) => { const parallel = Array.from({ length: count }, (_, index) => ` A -->|parallel_${direction}_${count}_${index}| B`) const content = [ `flowchart ${direction}`, " S[Source] -->|entry| A[Alpha]", ...parallel, " B[Beta] -->|exit| T[Target]", " B -->|reciprocal| A", " T -->|cycle| S", ].join("\n") const layout = expectFlowchartLabelsUnobstructed(content) const parallelRoutes = layout.routes.filter((route) => route.edge.from === "A" && route.edge.to === "B")
expect(parallelRoutes).toHaveLength(count) expect(new Set(parallelRoutes.map((route) => JSON.stringify(route.points))).size).toBe(count) })
test("keeps three parallel multiline edges legible in both orientations", () => { const horizontal = renderFlowchartDiagram(`flowchart LR A[Source] -->|first 1<br/>first 2<br/>first 3<br/>first 4| B[Target] A -->|second 1<br/>second 2<br/>second 3<br/>second 4| B A -->|third 1<br/>third 2<br/>third 3<br/>third 4| B`) const vertical = renderFlowchartDiagram(`flowchart TD A[Source] -->|first lane<br/>first two| B[Target] A -->|second lane<br/>second two| B A -->|third lane<br/>third two| B`)
for (const label of ["second 1", "second 2", "second 3", "second 4", "third 1", "third 2"]) { expect(horizontal).toContain(label) } for (const label of ["first lane", "first two", "second lane", "second two", "third lane", "third two"]) { expect(vertical).toContain(label) } })
test("keeps five parallel multiline edge labels distinct", () => { const output = renderFlowchartDiagram(`flowchart TD A[Source] -->|one alpha<br/>one beta| B[Target] A -->|two alpha<br/>two beta| B A -->|three alpha<br/>three beta| B A -->|four alpha<br/>four beta| B A -->|five alpha<br/>five beta| B`)
for (const number of ["one", "two", "three", "four", "five"]) { expect(output.match(new RegExp(`${number} alpha`, "g"))).toHaveLength(1) expect(output.match(new RegExp(`${number} beta`, "g"))).toHaveLength(1) } })
test("does not reserve label gaps for unlabeled fan-out", () => { const output = renderFlowchartDiagram(`flowchart TD S[The Boss] --> A[A] S --> B[B] S --> C[C] S --> D[D] S --> E[E] S --> F[F] S --> G[G] S --> H[H] S --> I[I] S --> J[J]`)
expect(Math.max(...output.split("\n").map((line) => stringWidth(line)))).toBeLessThanOrEqual(100) })
test("keeps transitive targets below intermediate vertical stages", () => { const content = `flowchart TD A[Start] --> B[Validate] B --> C[Publish] A --> C` const layout = layoutFlowchartDiagram(content) const output = renderFlowchartDiagram(content)
expect(layout.bounds.get("C")!.top).toBeGreaterThan(layout.bounds.get("B")!.top) expect(output.match(/[▼◀]/g)).toHaveLength(3) })
test("routes transitive horizontal shortcuts around intermediate stages", () => { const content = `flowchart LR A[Start] --> B[Validate] B --> C[Publish] A --> C` const layout = layoutFlowchartDiagram(content) const output = renderFlowchartDiagram(content)
expect(layout.bounds.get("C")!.left).toBeGreaterThan(layout.bounds.get("B")!.left) expect(output.match(/[▶▼]/g)).toHaveLength(3) })
test("folds oversized horizontal activity pipelines into a readable vertical layout", () => { const output = renderFlowchartDiagram( `flowchart LR C[ReceiveInput] --> P[Persist ActivityRequested] P --> S[Self RunPendingActivity] S --> O[OpenCode async task] O --> M[Self OutputObserved] M --> E[Persist OutputObserved]`, { layoutMaxWidth: 120 }, )
expectDiagram(output).toEqualDiagram(` ╭──────────────╮ │ ReceiveInput │ ╰───────┬──────╯ │ │ │ ▼ ╭───────────────────────────╮ │ Persist ActivityRequested │ ╰─────────────┬─────────────╯ │ │ │ ▼ ╭─────────────────────────╮ │ Self RunPendingActivity │ ╰────────────┬────────────╯ │ │ │ ▼ ╭─────────────────────╮ │ OpenCode async task │ ╰──────────┬──────────╯ │ │ │ ▼ ╭─────────────────────╮ │ Self OutputObserved │ ╰──────────┬──────────╯ │ │ │ ▼ ╭────────────────────────╮ │ Persist OutputObserved │ ╰────────────────────────╯ `) })
test("folds oversized horizontal feedback pipelines without losing labeled routes", () => { const output = renderFlowchartDiagram( `flowchart LR C[Commands] --> A[AgentThread activation] A -->|persist facts| J[(AgentThread journal)] A -->|resume / steer / abort| O[OpenCode session] O -->|observed output| A J -->|visible output requested| R[Reactor] R --> D[Discord]`, { layoutMaxWidth: 120 }, )
expectDiagram(output).toEqualDiagram(` ╭──────────╮ │ Commands │ ╰─────┬────╯ │ │ │ ▼ ╭────────────────────────╮ │ AgentThread activation │◀───── observed output ─────╮ ╰────────────┬───────────╯ │ │ │ ╭───── persist facts ──────┴── resume / steer / abort ──╮ │ │ │ │ ▼ │ │ ╭─────────────────────╮ ▼ │ ├─────────────────────┤ ╭──────────────────╮ │ │ AgentThread journal │ │ OpenCode session ├──╯ ├─────────────────────┤ ╰──────────────────╯ ╰──────────┬──────────╯ │ ╰ visible output requested ╮ │ ▼ ╭─────────╮ │ Reactor │ ╰────┬────╯ │ │ │ ▼ ╭─────────╮ │ Discord │ ╰─────────╯ `) })
test("wraps the real deployment chart responsively without losing content or geometry", () => { const expected = new Map([ [60, { width: 82, height: 108 }], [80, { width: 97, height: 85 }], [120, { width: 143, height: 77 }], [160, { width: 163, height: 69 }], ]) const results = [...expected].map(([budget, dimensions]) => { const result = expectResponsiveFlowchartValid(deploymentArchitectureSource, budget) expect(result.dimensions).toEqual(dimensions) for (const frame of result.layout.subgraphBounds.values()) { for (const other of result.layout.subgraphBounds.values()) { if (frame !== other) expect(boundsIntersect(frame, other)).toBe(false) } } return result.dimensions })
for (let index = 1; index < results.length; index++) { expect(results[index - 1]!.width).toBeLessThan(results[index]!.width) } })
test.each([7, 9])("wraps generated %s-node Unicode subgraph ranks across width targets", (count) => { const results = [60, 80, 120].map( (budget) => expectResponsiveFlowchartValid(generatedWideRankFlowchart(count), budget).dimensions, )
for (let index = 1; index < results.length; index++) { expect(results[index - 1]!.width).toBeLessThan(results[index]!.width) expect(results[index - 1]!.height).toBeGreaterThanOrEqual(results[index]!.height) } })
test("keeps responsive local-direction subgraphs clear of sibling nodes", () => { const layout = layoutFlowchartDiagram( `flowchart BT N0[Outside zero] subgraph Outer N2[Two] subgraph Inner direction LR N3[Three] N4[Four] end N5[X] end N7[Outside seven] N7 --> N2 N2 -->|label 6| N5 N5 --> N4 N0 --> N7`, { compact: true, layoutMaxWidth: 35 }, ) const nodes = [...layout.bounds.values()]
for (let left = 0; left < nodes.length; left++) { for (let right = left + 1; right < nodes.length; right++) { expect(boundsIntersect(nodes[left]!, nodes[right]!)).toBe(false) } } })
test("keeps external nodes outside local-direction subgraph frames", () => { const layout = layoutFlowchartDiagram( `flowchart LR Input([Input]) --> Parse subgraph Outer[Outer orchestration] direction RL subgraph Inner[Inner pipeline] direction TD Parse[Parse request] --> Validate{Valid?} Validate -->|yes| Cache[(Cache)] Cache -->|stale| Validate end Validate --> Dispatch[[Dispatch work]] Dispatch -->|requeue| Parse end Dispatch -. result .-> Output([Output]) Output -->|audit| Cache`, { compact: true, layoutMaxWidth: 120 }, ) const outer = layout.subgraphBounds.get("Outer")!
expect(boundsIntersect(outer, layout.bounds.get("Input")!)).toBe(false) expect(boundsIntersect(outer, layout.bounds.get("Output")!)).toBe(false) })
test("keeps responsive sibling subgraph frames and long titles disjoint", () => { const layout = layoutFlowchartDiagram( `flowchart TD subgraph Parent direction LR subgraph Left [A deliberately long left group title] direction LR A1[One] --> A2[Two] end subgraph Right [A deliberately long right group title] direction LR B1[Three] --> B2[Four] end A2 --> B1 end`, { compact: true, layoutMaxWidth: 35 }, )
expect(boundsIntersect(layout.subgraphBounds.get("Left")!, layout.subgraphBounds.get("Right")!)).toBe(false) })
test.each([80, 144])("keeps nested deployment groups compact and dependency-ordered at width %s", (width) => { const layout = layoutFlowchartDiagram( `flowchart LR Browser([Browser]) --> Gateway[Gateway] subgraph Cloud[Cloud platform] direction TB subgraph Compute[Compute] API[API service] --> Worker[Background worker] end subgraph Storage[Storage] Database[(Database)] Cache[(Cache)] end API --> Database Worker --> Cache end Gateway --> API Worker --> Result([Result])`, { compact: true, layoutMaxWidth: width }, ) const cloud = layout.subgraphBounds.get("Cloud")! const compute = layout.subgraphBounds.get("Compute")! const storage = layout.subgraphBounds.get("Storage")! const result = layout.bounds.get("Result")!
expect(layout.bounds.get("Worker")!.top).toBeGreaterThan(layout.bounds.get("API")!.top) expect(layout.bounds.get("Database")!.centerY).toBe(layout.bounds.get("Cache")!.centerY) expect(storage.top).toBeGreaterThan(compute.top + compute.height - 1) expect(cloud.width).toBeLessThanOrEqual(50) expect([...layout.subgraphBounds.values()].every((frame) => frame.labelSide === "top")).toBe(true) expect(boundsContains(cloud, compute)).toBe(true) expect(boundsContains(cloud, storage)).toBe(true) expect(boundsIntersect(cloud, result)).toBe(false) if (layout.diagram.direction === "TD") expect(result.top).toBeGreaterThan(cloud.top + cloud.height - 1) if (layout.diagram.direction === "LR") expect(result.left).toBeGreaterThan(cloud.left + cloud.width - 1)
for (const route of layout.routes.filter( (route) => (route.edge.from === "API" && route.edge.to === "Database") || (route.edge.from === "Worker" && route.edge.to === "Cache"), )) { for (const point of route.points) { expect(point.x).toBeGreaterThan(cloud.left) expect(point.x).toBeLessThan(cloud.left + cloud.width - 1) expect(point.y).toBeGreaterThan(cloud.top) expect(point.y).toBeLessThan(cloud.top + cloud.height - 1) } } })
test("keeps responsive labeled fan-out on one rank with a shared source junction", () => { const content = `flowchart LR Request([Request]) --> Gateway[API gateway] Gateway -->|authenticate| Auth[Authentication] Gateway -->|rate limit| Limit[Rate limiter] Gateway -->|cache lookup| Cache[(Response cache)] Auth --> Worker[Request worker] Limit --> Worker Cache --> Worker Worker --> Response([Response])` const layout = layoutFlowchartDiagram(content, { compact: true, layoutMaxWidth: 80 }) const branches = layout.routes.filter((route) => route.edge.from === "Gateway") const gateway = layout.bounds.get("Gateway")!
expect(new Set(["Auth", "Limit", "Cache"].map((id) => layout.bounds.get(id)!.centerY)).size).toBe(1) expect(new Set(branches.map((route) => JSON.stringify(route.points[0]))).size).toBe(1) expect(branches.flatMap((route) => route.points).every((point) => point.y > gateway.top)).toBe(true) for (const label of ["authenticate", "rate limit", "cache lookup"]) { expect(renderFlowchartDiagram(content, { compact: true, layoutMaxWidth: 80 })).toContain(label) } })
test("does not change parallel routes for a non-binding width target", () => { const diagram = parseMermaidFlowchartDiagram(`flowchart TD A[A] -->|one| B[B] A -->|two| B`) const unconstrained = layoutParsedFlowchartDiagram(diagram, { compact: true }) const nonBinding = layoutParsedFlowchartDiagram(diagram, { compact: true, layoutMaxWidth: 1_000 })
expect(nonBinding.routes.map((route) => route.points)).toEqual(unconstrained.routes.map((route) => route.points)) })
test("keeps responsive fan-out labels inside the width target", () => { const content = `flowchart TD subgraph Group S[Source] S -->|route 0 detail| N0[Node 0] S -->|route 1 detail| N1[Node 1] S -->|route 2 detail| N2[Node 2] S -->|route 3 detail| N3[Node 3] end` const layout = layoutFlowchartDiagram(content, { compact: true, layoutMaxWidth: 30 }) const output = renderFlowchartDiagram(content, { compact: true, layoutMaxWidth: 30 })
for (const route of layout.routes) { const label = flowchartRouteLabelLayout(route, visualLength) expect(label.point.x + label.width).toBeLessThanOrEqual(30) } expect(Math.max(...output.split("\n").map((line) => stringWidth(line)))).toBeLessThanOrEqual(34) })
test("parses Mermaid flowchart nodes and standard arrows", () => { const diagram = parseMermaidFlowchartDiagram(`flowchart TD Start([Start]):::focus --> Form[Collect Details] Form -->|valid| Store[(Orders DB)]:::store Form -- invalid --> Review(Manual Review) Review --> Decision{Approved?}`)
expect(diagram.direction).toBe("TD") expect(diagram.nodes).toEqual([ { id: "Start", label: "Start", shape: "rounded" }, { id: "Form", label: "Collect Details", shape: "box" }, { id: "Store", label: "Orders DB", shape: "database" }, { id: "Review", label: "Manual Review", shape: "rounded" }, { id: "Decision", label: "Approved?", shape: "decision" }, ]) expect(diagram.edges).toEqual([ { from: "Start", to: "Form", label: "" }, { from: "Form", to: "Store", label: "valid" }, { from: "Form", to: "Review", label: "invalid" }, { from: "Review", to: "Decision", label: "" }, ]) })
test("decodes HTML entities in node and edge labels", () => { const diagram = parseMermaidFlowchartDiagram(`flowchart LR A[HMAC verify <3s & continue] -->|result ≥ 1| B[Done]`)
expect(diagram.nodes.find((node) => node.id === "A")?.label).toBe("HMAC verify <3s & continue") expect(diagram.edges[0]?.label).toBe("result ≥ 1") })
test("preserves quoted multiline edge labels", () => { const diagram = parseMermaidFlowchartDiagram(`flowchart TD A -->|"fs: watcher/fff off<br/>events.persist: true<br/>mcp.stdio: false<br/>A --> B"| B`)
expect(diagram.edges).toEqual([ { from: "A", to: "B", label: "fs: watcher/fff off<br/>events.persist: true<br/>mcp.stdio: false<br/>A --> B", }, ]) })
test("parses and renders each edge in a chained flowchart statement", () => { const content = `flowchart LR API --> Worker --> DB[(Database)]` const diagram = parseMermaidFlowchartDiagram(content) const output = renderFlowchartDiagram(content, { compact: true })
expect(diagram.nodes).toEqual([ { id: "API", label: "API", shape: "box" }, { id: "Worker", label: "Worker", shape: "box" }, { id: "DB", label: "Database", shape: "database" }, ]) expect(diagram.edges).toEqual([ { from: "API", to: "Worker", label: "" }, { from: "Worker", to: "DB", label: "" }, ]) expectDiagram(output).toEqualDiagram(` ╭──────────╮ ╭─────╮ ╭────────╮ ├──────────┤ │ API ├───▶│ Worker ├───▶│ Database │ ╰─────╯ ╰────────╯ ├──────────┤ ╰──────────╯ `) })
test("preserves labels and styles on every edge in a chain", () => { const diagram = parseMermaidFlowchartDiagram(`flowchart LR A -->|plain| B -.->|retry| C ==>|done| D`)
expect(diagram.edges).toEqual([ { from: "A", to: "B", label: "plain" }, { from: "B", to: "C", label: "retry", style: "dashed" }, { from: "C", to: "D", label: "done", style: "thick" }, ]) })
test("expands & node groups into fan-in and fan-out edges", () => { const diagram = parseMermaidFlowchartDiagram(`flowchart LR N[Native] & M[Mapped] & O --> LM["LanguageModel"] LM -->|prepare| REQ & LOG`)
expect(diagram.nodes).toEqual([ { id: "N", label: "Native", shape: "box" }, { id: "M", label: "Mapped", shape: "box" }, { id: "O", label: "O", shape: "box" }, { id: "LM", label: "LanguageModel", shape: "box" }, { id: "REQ", label: "REQ", shape: "box" }, { id: "LOG", label: "LOG", shape: "box" }, ]) expect(diagram.edges).toEqual([ { from: "N", to: "LM", label: "" }, { from: "M", to: "LM", label: "" }, { from: "O", to: "LM", label: "" }, { from: "LM", to: "REQ", label: "prepare" }, { from: "LM", to: "LOG", label: "prepare" }, ]) })
test("expands & groups on both sides of an edge and through a chain", () => { const diagram = parseMermaidFlowchartDiagram(`flowchart LR A & B --> C & D --> E`)
expect(diagram.edges).toEqual([ { from: "A", to: "C", label: "" }, { from: "A", to: "D", label: "" }, { from: "B", to: "C", label: "" }, { from: "B", to: "D", label: "" }, { from: "C", to: "E", label: "" }, { from: "D", to: "E", label: "" }, ]) })
test("declares every node of a bare & group inside the current subgraph", () => { const diagram = parseMermaidFlowchartDiagram(`flowchart TD subgraph Runtime A[Alpha] & B[Beta]:::focus end A --> B`)
expect(diagram.nodes).toEqual([ { id: "A", label: "Alpha", shape: "box" }, { id: "B", label: "Beta", shape: "box" }, ]) expect(diagram.subgraphs?.[0]?.nodeIds).toEqual(["A", "B"]) })
test("keeps & inside quoted or bracketed labels as label text", () => { const diagram = parseMermaidFlowchartDiagram(`flowchart LR A["Fetch & parse"] & B[R&D] --> C[Done & dusted]`)
expect(diagram.nodes).toEqual([ { id: "A", label: "Fetch & parse", shape: "box" }, { id: "B", label: "R&D", shape: "box" }, { id: "C", label: "Done & dusted", shape: "box" }, ]) expect(diagram.edges).toEqual([ { from: "A", to: "C", label: "" }, { from: "B", to: "C", label: "" }, ]) })
test("keeps & inside edge labels as label text", () => { const diagram = parseMermaidFlowchartDiagram(`flowchart LR X[a & b] -->|x & y| Y`)
expect(diagram.nodes.find((node) => node.id === "X")?.label).toBe("a & b") expect(diagram.edges).toEqual([{ from: "X", to: "Y", label: "x & y" }]) })
test("rejects empty & group members", () => { for (const statement of ["A & --> B", "& A --> B", "A --> B &", "A &"]) { expect(() => parseMermaidFlowchartDiagram(`flowchart LR\n ${statement}`)).toThrow( `Unsupported syntax in flowchart diagram at line 2: "${statement}"`, ) } })
test("renders a fan-in expressed with & the same as separate edge statements", () => { const grouped = renderFlowchartDiagram(`flowchart LR N & M & O --> LM[LanguageModel] --> REQ[LLMRequest]`) const separate = renderFlowchartDiagram(`flowchart LR N --> LM[LanguageModel] M --> LM O --> LM LM --> REQ[LLMRequest]`)
expect(grouped).toBe(separate) expect(grouped).toContain("LanguageModel") })
test("parses chained undirected solid edges", () => { const diagram = parseMermaidFlowchartDiagram(`flowchart LR A --- B --- C`)
expect(diagram.edges).toEqual([ { from: "A", to: "B", label: "", arrowhead: false }, { from: "B", to: "C", label: "", arrowhead: false }, ]) })
test("parses labeled undirected dashed and bidirectional edges", () => { const diagram = parseMermaidFlowchartDiagram(`flowchart LR DB[(Durable Object SQLite)] API[Slack API] DB -. no shared transaction .- API API <--> DB`)
expect(diagram.edges).toEqual([ { from: "DB", to: "API", label: "no shared transaction", style: "dashed", arrowhead: false }, { from: "API", to: "DB", label: "", sourceArrowhead: true }, ]) const dashedOutput = renderFlowchartDiagram(`flowchart LR DB[(Durable Object SQLite)] -. no shared transaction .- API[Slack API]`) const bidirectionalOutput = renderFlowchartDiagram(`flowchart LR DB[(Durable Object SQLite)] <--> API[Slack API]`) expect(dashedOutput).toContain("no shared transaction") expect(bidirectionalOutput.match(/[◀▶▲▼]/g)?.length).toBeGreaterThanOrEqual(2) })
test("renders the volume persistence diagram with an undirected solid edge", () => { const content = `flowchart LR subgraph durable [Durable — survives everything] V[(Volume ws-wor_abc<br/>mounted at /workspace)] R[our row: id, provider] end subgraph ephemeral [Ephemeral — dies freely] S1[Sandbox #1] -. mounts .-> V S2[Sandbox #2<br/>Tuesday] -. mounts same .-> V X[apt-get installs,<br/>~/.cache, /tmp] end S1 --- X style X stroke-dasharray: 5 5` const diagram = parseMermaidFlowchartDiagram(content) const layout = layoutParsedFlowchartDiagram(diagram, { compact: true }) const grid = drawParsedFlowchartDiagramGrid(diagram, { compact: true }) const output = renderFlowchartDiagram(content, { compact: true }) const route = layout.routes.find((route) => route.edge.from === "S1" && route.edge.to === "X")! const end = route.points.at(-1)!
expect(diagram.edges.at(-1)).toEqual({ from: "S1", to: "X", label: "", arrowhead: false }) expect(route.points.length).toBeGreaterThan(1) expect(grid.getCell(end.x, end.y)?.char).not.toMatch(/[▶▼◀▲]/) expectDiagram(output).toContainInOrder("Sandbox #1", "apt-get installs,", "~/.cache, /tmp") })
test.each(["LR", "RL", "TD", "BT"] as const)( "keeps undirected %s routes continuous up to the target", (direction) => { const content = `flowchart ${direction}\n A[Alpha] --- B[(Store)]` const diagram = parseMermaidFlowchartDiagram(content) const layout = layoutParsedFlowchartDiagram(diagram) const grid = drawParsedFlowchartDiagramGrid(diagram) const route = layout.routes[0]!
expect(terminalPointsTowardBounds(route, layout.bounds.get("B")!)).toBe(true) for (let index = 1; index < route.points.length; index++) { const from = route.points[index - 1]! const to = route.points[index]! const length = Math.abs(to.x - from.x) + Math.abs(to.y - from.y) for (let offset = 0; offset <= length; offset++) { const x = from.x + Math.sign(to.x - from.x) * offset const y = from.y + Math.sign(to.y - from.y) * offset expect(grid.getCell(x, y)?.char).not.toBe(" ") } } expect(grid.getCell(route.points.at(-1)!.x, route.points.at(-1)!.y)?.char).toMatch(/[─│]/) }, )
test("keeps independent horizontal fan-out groups on distinct routes", () => { const content = `flowchart LR A[A] -->|A to X| X[X] A -->|A to Y| Y[Y] B[B] -->|B to Y| Y B -->|B to Z| Z[Z]` const output = renderFlowchartDiagram(content) const routes = layoutFlowchartDiagram(content).routes const routeByLabel = new Map(routes.map((route) => [route.edge.label, route]))
for (const label of ["A to X", "A to Y", "B to Y", "B to Z"]) { expect(output.match(new RegExp(label, "g"))).toHaveLength(1) } expect(routeByLabel.get("A to X")!.points[1]!.x).toBe(routeByLabel.get("A to Y")!.points[1]!.x) expect(routeByLabel.get("B to Y")!.points[1]!.x).toBe(routeByLabel.get("B to Z")!.points[1]!.x) expect(routeByLabel.get("A to Y")!.points[1]!.x).not.toBe(routeByLabel.get("B to Y")!.points[1]!.x) expect(routeByLabel.get("A to Y")!.points.at(-1)).not.toEqual(routeByLabel.get("B to Y")!.points.at(-1)) })
test("parses and renders inline dashed edge labels", () => { const content = `flowchart TD CS[conformance suite<br/>same test cases pin every driver] -.verifies.-> LS CS -.verifies.-> MS CS -.verifies.-> MEM[memory driver]` const diagram = parseMermaidFlowchartDiagram(content) const output = renderFlowchartDiagram(content, { compact: true })
expect(diagram.edges).toEqual([ { from: "CS", to: "LS", label: "verifies", style: "dashed" }, { from: "CS", to: "MS", label: "verifies", style: "dashed" }, { from: "CS", to: "MEM", label: "verifies", style: "dashed" }, ]) expect(output.match(/verifies/g)).toHaveLength(3) expect(output).not.toContain("─ ─") })
test("uses invisible subgraph links for ordering without rendering them", () => { const content = `flowchart LR subgraph before [Before] T1[read/edit/write/patch<br/>shell/grep/glob] --> F1[FSUtil / node:fs / AppProcess<br/>+ hosted branching in every tool] end subgraph after [After — merged this week] T2[same 8 tools] --> E[Environment<br/>files + spawner] E --> D{driver} D --> L[local<br/>node:fs] D --> M[Modal<br/>sandbox.exec] D --> Mem[memory<br/>tests] end before ~~~ after` const diagram = parseMermaidFlowchartDiagram(content) const layout = layoutParsedFlowchartDiagram(diagram, { compact: true }) const output = renderFlowchartDiagram(content, { compact: true })
expect(diagram.edges.at(-1)).toEqual({ from: "before", to: "after", label: "", orderOnly: true }) expect(diagram.nodes.some((node) => node.id === "before" || node.id === "after")).toBe(false) expect(layout.routes).toHaveLength(diagram.edges.length - 1) expect(layout.routes.some((route) => route.edge.orderOnly)).toBe(false) expect(layout.subgraphBounds.get("before")!.left).toBeLessThan(layout.subgraphBounds.get("after")!.left) const chain = ["T2", "E", "D"].map((id) => layout.bounds.get(id)!) expect(chain.map((bounds) => bounds.centerY)).toEqual([chain[0]!.centerY, chain[0]!.centerY, chain[0]!.centerY]) for (const route of layout.routes.filter((route) => route.edge.from === "T2" || route.edge.from === "E")) { expect(new Set(route.points.map((point) => point.y)).size).toBe(1) } expect(output).toContain("Before") expect(output).toContain("After — merged this week") })
test("keeps every node and edge in a long chain distinct and in its subgraph", () => { const diagram = parseMermaidFlowchartDiagram(`flowchart LR subgraph Pipeline A --> B --> C --> D --> E --> F --> G --> H --> I --> J --> K --> L end`)
expect(diagram.nodes.map((node) => node.id)).toEqual(["A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L"]) expect(diagram.edges.map((edge) => `${edge.from}->${edge.to}`)).toEqual([ "A->B", "B->C", "C->D", "D->E", "E->F", "F->G", "G->H", "H->I", "I->J", "J->K", "K->L", ]) expect(diagram.subgraphs?.[0]?.nodeIds).toEqual(["A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L"]) })
test("parses bare subgraph nodes before a chained edge", () => { const diagram = parseMermaidFlowchartDiagram(`flowchart LR subgraph Services API Worker end API --> Worker --> DB[(Database)]`)
expect(diagram.nodes.map((node) => node.id)).toEqual(["API", "Worker", "DB"]) expect(diagram.edges.map((edge) => [edge.from, edge.to])).toEqual([ ["API", "Worker"], ["Worker", "DB"], ]) expect(diagram.subgraphs?.[0]?.nodeIds).toEqual(["API", "Worker"]) })
test("parses Mermaid subgraph groups", () => { const diagram = parseMermaidFlowchartDiagram(`flowchart LR subgraph Web [Web App] UI[UI] --> API[API] end subgraph Platform API --> DB[(Database)] end`)
expect(diagram.subgraphs).toEqual([ { id: "Web", label: "Web App", nodeIds: ["UI", "API"], parentId: undefined }, { id: "Platform", label: "Platform", nodeIds: ["API", "DB"], parentId: undefined }, ]) })
test("parses Mermaid subgraph-local directions", () => { const diagram = parseMermaidFlowchartDiagram(`flowchart TD subgraph Verse direction LR A[A] --> B[B] end`)
expect(diagram.subgraphs).toEqual([ { id: "Verse", label: "Verse", nodeIds: ["A", "B"], parentId: undefined, direction: "LR" }, ]) })
test("parses and renders Mermaid subroutine nodes", () => { const content = `flowchart LR Parse[[Parse]] --> Layout[Layout]` const diagram = parseMermaidFlowchartDiagram(content) const output = renderFlowchartDiagram(content)
expect(diagram.nodes[0]).toEqual({ id: "Parse", label: "Parse", shape: "subroutine" }) expectDiagram(output).toContainInOrder("╭─┬─────┬─╮", "│ │Parse│ ├", "╰─┴─────┴─╯") })
test("parses and renders Mermaid thick edges", () => { const content = `flowchart LR Build[Build] ==> Ship[Ship]` const diagram = parseMermaidFlowchartDiagram(content) const output = renderFlowchartDiagram(content)
expect(diagram.edges).toEqual([{ from: "Build", to: "Ship", label: "", style: "thick" }]) expect(output).toContain("━━━━━━▶") })
test("parses and renders Mermaid dashed edges", () => { const content = `flowchart LR Build[Build] -.-> Ship[Ship]` const diagram = parseMermaidFlowchartDiagram(content) const output = renderFlowchartDiagram(content)
expect(diagram.edges).toEqual([{ from: "Build", to: "Ship", label: "", style: "dashed" }]) expect(output).toContain("──────▶") })
test("paints horizontal and vertical dashed routes with solid terminal cells", () => { for (const direction of ["LR", "TD"] as const) { const content = `flowchart ${direction}\n A -.-> B` const diagram = parseMermaidFlowchartDiagram(content) const layout = layoutParsedFlowchartDiagram(diagram) const grid = drawParsedFlowchartDiagramGrid(diagram) const route = layout.routes[0]!
expect(route.edge.style).toBe("dashed") for (let index = 1; index < route.points.length; index++) { const from = route.points[index - 1]! const to = route.points[index]! const length = Math.abs(to.x - from.x) + Math.abs(to.y - from.y) for (let offset = 0; offset <= length; offset++) { const x = from.x + Math.sign(to.x - from.x) * offset const y = from.y + Math.sign(to.y - from.y) * offset expect(grid.getCell(x, y)?.char).not.toBe(" ") } } } })
test("leaves shared fan-out junctions neutral", () => { const content = `flowchart LR D{driver} --> L[local] D --> M[Modal] D --> Mem[memory]` const diagram = parseMermaidFlowchartDiagram(content) const layout = layoutParsedFlowchartDiagram(diagram, { compact: true }) const grid = drawParsedFlowchartDiagramGrid(diagram, { compact: true }) const junction = layout.routes[0]!.points[1]!
expect(grid.getCell(junction.x, junction.y)?.style).toBe("edge") })
test("distributes short source fades before the first corner", () => { const content = `flowchart TD C[Files contract<br/>read / write / stat<br/>errors: Failed] -->|implemented by| ED[exec-defaults<br/>fused scripts<br/>one process]` const layout = layoutFlowchartDiagram(content) const grid = drawFlowchartDiagramGrid(content) const firstCorner = layout.routes[0]!.points[1]! const fadeStyles = new Set( grid.rows.flatMap((row) => row.map((cell) => cell.style)).filter((style) => style?.startsWith("nodeEdgeFade")), )
expect(fadeStyles.has("nodeEdgeFade1")).toBe(false) expect(fadeStyles.has("nodeEdgeFade5")).toBe(true) expect(grid.getCell(firstCorner.x, firstCorner.y)?.style).toBe("edge") })
test("tracks nested Mermaid subgraphs", () => { const diagram = parseMermaidFlowchartDiagram(`flowchart LR subgraph Outer subgraph Inner [Inner Work] A[A] --> B[B] end B --> C[C] end`)
expect(diagram.subgraphs).toEqual([ { id: "Outer", label: "Outer", nodeIds: ["B", "C"], parentId: undefined }, { id: "Inner", label: "Inner Work", nodeIds: ["A", "B"], parentId: "Outer" }, ]) })
test("detects graph headers and renders a terminal flowchart", () => { const output = renderFlowchartDiagram(`graph LR Client([Client]) --> API[API] API --> Cache[(Cache)]`)
expectDiagram(output).toEqualDiagram(` ╭───────╮ ╭────────╮ ╭─────╮ ├───────┤ │ Client ├──────▶│ API ├──────▶│ Cache │ ╰────────╯ ╰─────╯ ├───────┤ ╰───────╯ `) })
test("renders Mermaid decision diamond nodes", () => { const output = renderFlowchartDiagram(`flowchart LR Build[Build] --> Gate{Ready?} Gate -->|yes| Ship([Ship]) Gate -->|no| Fix[Fix]`)
expect(output).toContain("Ready?") expect(output).toContain("╭─╯") expect(output).toContain("╰─╮") expect(output).toContain("yes") expect(output).toContain("no") expect(output).not.toMatch(/[╱╲\\/]/) })
test("pads edge labels away from corners and arrowheads", () => { const output = renderFlowchartDiagram(`flowchart LR Gate{Ready?} -->|pass| Stage[(Stage)] Gate -->|notes| Notes([Notes])`)
expect(output).toContain(" pass ") expect(output).toContain(" notes ") expect(output).not.toContain("┌pass") expect(output).not.toContain("└notes") expect(output).not.toContain("pass─▶") expect(output).not.toContain("notes▶") })
test("renders br-delimited edge labels on separate rows", () => { const output = renderFlowchartDiagram(`flowchart LR A[Start] -->|first<br/>second line| B[Finish]`)
expect(output).toContain("first") expect(output).toContain("second line") expect(output.indexOf("first")).toBeLessThan(output.indexOf("second line")) expect(output).not.toContain("<br") })
test("renders edge labels with an independent background", () => { const background = parseColor("#334455") const styled = renderGridStyledText( drawFlowchartDiagramGrid(`flowchart LR A[Start] -->|route label| B[Finish]`), resolveFlowchartStyleColors(), { label: background }, )
expect(styled.chunks.some((chunk) => chunk.text.includes("route label") && chunk.bg === background)).toBe(true) expect(styled.chunks.some((chunk) => chunk.text.includes("Start") && chunk.bg !== undefined)).toBe(false) })
test("keeps quoted multiline labels compact and renders italic node text", () => { const source = `flowchart TB DO["ServerWorkerd.create({ storage, config })"] DO --> SO["serverOptions()<br/><i>option flags</i>"] DO --> RP["replacements()<br/><i>layer overrides</i>"] SO -->|"fs: watcher/fff off<br/>events.persist: true<br/>mcp.stdio: false<br/>config as string"| SF["ServerFetch.make(options, { overrides })"] RP -->|"Database → DO-SQLite<br/>Shell/FS/Pty → typed-unavailable<br/>Snapshot/Vcs → no-op<br/>plugins → precompiled only"| SF SF --> GRAPH["LayerNode graph<br/>(core builds normally,<br/>swapped nodes substituted)"]` const grid = drawFlowchartDiagramGrid(source) const output = grid.toString({ trimTop: true, trimBottom: true }) const styled = renderGridStyledText(grid, resolveFlowchartStyleColors())
expect(Math.max(...output.split("\n").map((line) => stringWidth(line)))).toBeLessThan(140) expect(output).not.toMatch(/<\/?i>|<br|events persist|mcp stdio|^[^\n]*"fs:/) expect( styled.chunks.some((chunk) => chunk.text.includes("option flags") && chunk.attributes === TextAttributes.ITALIC), ).toBe(true) })
test("keeps quoted architecture labels from distorting subgraph routes", () => { const source = `flowchart TB subgraph consumer["Durable Object"] DO["ServerWorkerd.create({ storage, config })"] end
DO --> SO["serverOptions()<br/><i>option flags</i>"] DO --> RP["replacements()<br/><i>layer overrides</i>"]
SO -->|"fs: watcher/fff off<br/>events.persist: true<br/>mcp.stdio: false<br/>config as string"| SF["ServerFetch.make(options, { overrides })"] RP -->|"Database → DO-SQLite<br/>Shell/FS/Pty → typed-unavailable<br/>Snapshot/Vcs → no-op<br/>plugins → precompiled only"| SF
SF --> GRAPH["LayerNode graph<br/>(core builds normally,<br/>swapped nodes substituted)"]
subgraph bundle["3rd mechanism: bundle conditions (build time)"] COND["--conditions=workerd<br/>pty / fff / photon / shell-parser<br/>native modules → inert stubs<br/>#global-roots → workerd path rooting"] end COND -.->|import resolution| GRAPH` const output = renderFlowchartDiagram(source)
expect(Math.max(...output.split("\n").map((line) => stringWidth(line)))).toBeLessThan(130) expect(output).not.toMatch(/<\/?i>|<br|^[^\n]*"(?:fs:|Database)/) for (const label of [ "fs: watcher/fff off", "events.persist: true", "mcp.stdio: false", "config as string", "Database → DO-SQLite", "Shell/FS/Pty → typed-unavailable", "Snapshot/Vcs → no-op", "plugins → precompiled only", ]) { expect(output).toContain(label) } })
test("keeps tall multiline branch labels out of sibling nodes", () => { const output = renderFlowchartDiagram(`flowchart LR A[Start] -->|one<br/>two<br/>three<br/>four<br/>five| B[Upper] A --> C[Lower]`) const lines = output.split("\n") const labelRows = ["one", "two", "three", "four", "five"].map((line) => lines.findIndex((row) => row.includes(line)), ) const lowerRow = lines.findIndex((line) => line.includes("Lower"))
expect(labelRows).toEqual([...labelRows].sort((left, right) => left - right)) expect(lowerRow).toBeGreaterThan(labelRows.at(-1)!) })
test("keeps multiline vertical edge labels above their target node", () => { const output = renderFlowchartDiagram(`flowchart TD A[Start] -->|first<br/>second<br/>third<br/>fourth| B[Finish]`) const lines = output.split("\n") const fourthRow = lines.findIndex((line) => line.includes("fourth")) const finishRow = lines.findIndex((line) => line.includes("Finish"))
expect(fourthRow).toBeGreaterThanOrEqual(0) expect(finishRow).toBeGreaterThan(fourthRow) expect(output).not.toContain("<br") })
test.each( (["TD", "BT"] as const).flatMap((direction) => [false, true].flatMap((compact) => [2, 4].map((lines) => ({ direction, compact, lines }))), ), )( "keeps $lines-line $direction labels off both terminal rows with compact=$compact", ({ direction, compact, lines }) => { const label = Array.from({ length: lines }, (_, index) => `line ${index + 1}`).join("<br/>") const route = layoutFlowchartDiagram(`flowchart ${direction}\n A[A] -->|${label}| B[B]`, { compact }).routes[0]! const layout = flowchartRouteLabelLayout(route, visualLength) const terminals = new Set([route.points[0]!.y, route.points.at(-1)!.y])
for (let y = layout.point.y; y < layout.point.y + layout.height; y++) expect(terminals.has(y)).toBe(false) }, )
test("expands canvas for multiline back-edge labels", () => { const output = renderFlowchartDiagram(`flowchart TD A --> B B -->|try<br/>again| A`)
expect(output).toContain("try") expect(output).toContain("again") expect(output).not.toContain("<br") })
test("only expands horizontal rank gaps for labeled edges", () => { const { bounds } = layoutFlowchartDiagram(`flowchart LR Spec[Spec] --> Plan[Plan] Plan --> Build[Build] Build --> Gate{Ready?} Gate -->|pass| Stage[(Stage)]`) const gapBetween = (fromId: string, toId: string): number => { const from = bounds.get(fromId)! const to = bounds.get(toId)! return to.left - (from.left + from.width) }
expect(gapBetween("Spec", "Plan")).toBe(DEFAULT_MIN_RANK_GAP) expect(gapBetween("Plan", "Build")).toBe(DEFAULT_MIN_RANK_GAP) expect(gapBetween("Build", "Gate")).toBe(DEFAULT_MIN_RANK_GAP) expect(gapBetween("Gate", "Stage")).toBeGreaterThan(DEFAULT_MIN_RANK_GAP) })
test("renders Mermaid subgraph frames", () => { const output = renderFlowchartDiagram(`graph LR subgraph Web [Web App] UI[UI] --> API[API] end API --> DB[(DB)]`)
expect(output).toContain("Web App") expect(output).toContain("UI") expect(output).toContain("API") expect(output).toContain("DB") expect(output).toContain("╭─ Web App ") expect(output.split("\n").find((line) => line.includes("API") && line.includes("DB"))).not.toContain("┼") })
test("breaks vertical subgraph borders where horizontal routes pass through", () => { const content = `flowchart LR Outside[Outside] --> Inside subgraph Group Inside[Inside] end` const diagram = parseMermaidFlowchartDiagram(content) const layout = layoutParsedFlowchartDiagram(diagram) const grid = drawParsedFlowchartDiagramGrid(diagram) const group = layout.subgraphBounds.get("Group")! const crossing = { x: group.left, y: layout.routes[0]!.points.at(-1)!.y }
expect(grid.getCell(crossing.x, crossing.y)?.char).toBe("─") expect(grid.getCell(crossing.x, crossing.y)?.style).not.toBe("group") expect(grid.getCell(crossing.x - 1, crossing.y)?.char).toBe("─") expect(grid.getCell(crossing.x, crossing.y - 1)?.char).toBe("│") expect(grid.getCell(crossing.x, crossing.y + 1)?.char).toBe("│") })
test("breaks horizontal subgraph borders where vertical routes pass through", () => { const content = `flowchart TD Outside[Outside] --> Inside subgraph Outer [O] subgraph Inner Inside[Inside] end end` const diagram = parseMermaidFlowchartDiagram(content) const layout = layoutParsedFlowchartDiagram(diagram) const grid = drawParsedFlowchartDiagramGrid(diagram) const outer = layout.subgraphBounds.get("Outer")! const crossing = { x: layout.routes[0]!.points[0]!.x, y: outer.top }
expect(grid.getCell(crossing.x, crossing.y)?.char).toBe("│") expect(grid.getCell(crossing.x, crossing.y)?.style).not.toBe("group") expect(grid.getCell(crossing.x - 1, crossing.y)?.char).toBe("─") expect(grid.getCell(crossing.x + 1, crossing.y)?.char).toBe("─") expect(grid.getCell(crossing.x, crossing.y - 1)?.char).toBe("│") })
test("reserves frame rows for br-delimited subgraph labels", () => { const output = renderFlowchartDiagram(`flowchart LR subgraph Web [API<br/>Services] A[Worker] end`) const lines = output.split("\n") const apiRow = lines.findIndex((line) => line.includes("API")) const servicesRow = lines.findIndex((line) => line.includes("Services")) const workerRow = lines.findIndex((line) => line.includes("Worker"))
expect(apiRow).toBeGreaterThanOrEqual(0) expect(servicesRow).toBe(apiRow + 1) expect(workerRow).toBeGreaterThan(servicesRow) expect(output).not.toContain("<br") })
test("moves multiline subgraph labels away from entering routes", () => { const output = renderFlowchartDiagram(`flowchart TD Input --> A subgraph Group [Line one<br/>Line two] A[A] --> B[B] end`) const lines = output.split("\n") const lineOne = lines.findIndex((line) => line.includes("Line one")) const lineTwo = lines.findIndex((line) => line.includes("Line two")) const b = lines.findIndex((line) => line.includes("│ B │"))
expect(lineOne).toBeGreaterThan(b) expect(lineTwo).toBe(lineOne + 1) expect(output).not.toContain("<br") })
test("keeps long Unicode subgraph titles from replacing entering arrowheads", () => { const content = `flowchart TD U[Up] --> A subgraph G [界界界界界界] A[A] end A --> D[Down]` const diagram = parseMermaidFlowchartDiagram(content) const layout = layoutParsedFlowchartDiagram(diagram, { compact: true }) const grid = drawParsedFlowchartDiagramGrid(diagram, { compact: true }) const entry = layout.routes.find((route) => route.edge.from === "U")! const end = entry.points.at(-1)!
expect(grid.getCell(end.x, end.y)?.char).toBe(diagramArrowHeadBetween(entry.points.at(-2)!, end)) })
test("lays out subgraph-local directions independently from the outer flow", () => { const layout = layoutFlowchartDiagram(`flowchart TD Start[Start] --> A[A] subgraph Steps direction LR A --> B[B] B --> C[C] end C --> Done[Done]`) const a = layout.bounds.get("A")! const b = layout.bounds.get("B")! const c = layout.bounds.get("C")! const done = layout.bounds.get("Done")! const route = layout.routes.find((candidate) => candidate.edge.from === "A" && candidate.edge.to === "B")!
expect(a.centerY).toBe(b.centerY) expect(b.left).toBeGreaterThan(a.left) expect(c.left).toBeGreaterThan(b.left) expect(done.top).toBeGreaterThan(c.top) expect(route.points[0]!.y).toBe(route.points[route.points.length - 1]!.y) })
test("routes cross-subgraph edges around local-direction siblings", () => { const layout = layoutFlowchartDiagram(`flowchart TD subgraph Workers direction TD A[Worker one] --> B[Worker two] end subgraph Peer direction RL C[Store] --> D[Transform] end B --> D`) const route = layout.routes.find((candidate) => candidate.edge.from === "B" && candidate.edge.to === "D")!
expect(routeIntersectsBounds(route, layout.bounds.get("C")!)).toBe(false) })
test.each([ ["BT", { compact: true }], ["LR", { compact: true }], ["RL", { compact: true }], ] as const)("keeps labeled cross-group routes clear of sibling nodes in %s layouts", (direction, options) => { const content = `flowchart ${direction} subgraph Left direction RL A[API] --> B[Queue] end subgraph Right direction TB C[Transform] --> D[Accept] end B -->|cross group| C D -->|retry group| A` const layout = layoutFlowchartDiagram(content, options) const crossGroup = layout.routes.find((route) => route.edge.from === "B" && route.edge.to === "C")!
if (direction !== "LR") expect(routeIntersectsBounds(crossGroup, layout.bounds.get("A")!)).toBe(false) expect(renderFlowchartDiagram(content, options)).toContain("cross group") expect(renderFlowchartDiagram(content, options)).toContain("retry group") })
test.each(["LR", "RL"] as const)( "keeps nested result labels and target-facing entry routes in %s layouts", (direction) => { const content = `flowchart ${direction} I[Input] --> A subgraph Outer direction LR subgraph Inner direction BT A[Parse] --> B[Valid] B --> C[Cache] C --> B end B --> D[Dispatch] end D -->|result path| O[Output]` const layout = layoutFlowchartDiagram(content) const entry = layout.routes.find((route) => route.edge.from === "I" && route.edge.to === "A")!
expect(renderFlowchartDiagram(content)).toContain("result path") expect(terminalPointsTowardBounds(entry, layout.bounds.get("A")!)).toBe(true) }, )
test("keeps labels on nested routes that pass translated outer siblings", () => { const output = renderFlowchartDiagram(`flowchart TD Input --> Parse subgraph Outer direction LR subgraph Inner direction BT Parse[Parse] --> Validate{Valid?} Validate -->|yes| Cache[(Cache)] Cache --> Validate end Validate --> Dispatch[Dispatch] end`)
expect(output).toContain("yes") })
test("routes nested RL local edges around outer siblings", () => { const layout = layoutFlowchartDiagram( `flowchart RL I([Input λ]) --> A subgraph Outer [Outer group 長い] direction LR subgraph Inner [Inner<br/>工程] direction BT A[Parse request] -->|inner edge| B{Valid?} B --> C[(Cache Ω)] C --> B end B --> D[[Dispatch work]] end D -.->|result path| O([Output μ])`, { compact: true }, )
for (const route of layout.routes.filter((route) => ["A", "B", "C"].includes(route.edge.from))) { if (route.edge.to === "D") continue expect(routeIntersectsBounds(route, layout.bounds.get("D")!)).toBe(false) } })
test("keeps nested local-direction layouts rigid across direction and compact matrices", () => { const directions = ["LR", "RL", "TD", "BT"] as const for (const global of directions) { for (const outer of directions) { for (const inner of directions) { for (const compact of [false, true]) { const layout = layoutFlowchartDiagram( `flowchart ${global} X[X] --> A subgraph Outer [Outer] direction ${outer} subgraph Inner [Inner] direction ${inner} A[A] --> B[B] end B --> C[C] end C --> Y[Y]`, { compact }, ) const nodes = [...layout.bounds.values()] const innerFrame = layout.subgraphBounds.get("Inner")! const outerFrame = layout.subgraphBounds.get("Outer")! const a = layout.bounds.get("A")! const b = layout.bounds.get("B")! const c = layout.bounds.get("C")!
for (let left = 0; left < nodes.length; left++) { for (let right = left + 1; right < nodes.length; right++) { expect(boundsIntersect(nodes[left]!, nodes[right]!)).toBe(false) } } expect(boundsContains(innerFrame, a)).toBe(true) expect(boundsContains(innerFrame, b)).toBe(true) expect(boundsContains(outerFrame, innerFrame)).toBe(true) expect(boundsContains(outerFrame, c)).toBe(true) expect(layout.routes.every((route) => route.points.length >= 2)).toBe(true) expectFlowchartRoutesAvoidUnrelatedNodes(layout) for (const frame of layout.subgraphBounds.values()) { for (const route of layout.routes) { expect(routeRunsAlongHorizontalBorder(route, frame)).toBe(false) expect(routeRunsAlongVerticalBorder(route, frame)).toBe(false) } }
if (inner === "LR") expect(b.left).toBeGreaterThan(a.left) if (inner === "RL") expect(b.left).toBeLessThan(a.left) if (inner === "TD") expect(b.top).toBeGreaterThan(a.top) if (inner === "BT") expect(b.top).toBeLessThan(a.top) if (outer === "LR") expect(c.centerX).toBeGreaterThan(b.centerX) if (outer === "RL") expect(c.centerX).toBeLessThan(b.centerX) if (outer === "TD") expect(c.centerY).toBeGreaterThan(b.centerY) if (outer === "BT") expect(c.centerY).toBeLessThan(b.centerY) } } } } })
test("compacts stacked subgraph-local direction rows", () => { const layout = layoutFlowchartDiagram(`flowchart TD Start[Start] --> A subgraph First [first row] direction LR A[A] --> B[B] end B --> C subgraph Second [second row] direction LR C[C] --> D[D] end D --> Done[Done]`) const first = layout.subgraphBounds.get("First")! const second = layout.subgraphBounds.get("Second")! const betweenRows = layout.routes.find((route) => route.edge.from === "B" && route.edge.to === "C")!
expect(second.top).toBeGreaterThan(first.top) expect(second.top - (first.top + first.height)).toBeLessThanOrEqual(DEFAULT_MIN_VERTICAL_RANK_GAP) expect(routeRunsAlongHorizontalBorder(betweenRows, first)).toBe(false) expect(routeRunsAlongHorizontalBorder(betweenRows, second)).toBe(false) })
test("keeps subgraph labels readable when routes enter through the frame", () => { const output = renderFlowchartDiagram(`flowchart TD Start[Start] --> Remember subgraph Remembering [remember to] direction LR Remember[remember to] --> Heart[Heart] end`)
expect(output).toContain(" remember to ") expect(output).not.toContain("rememb▼r") })
test("keeps local LR branch joins compact when they feed a vertical stage", () => { const content = `flowchart TD Start[Start] --> A subgraph Verse [verse] direction LR A[A] B[B] C[C] D[D] E[E] F[F] G[G] A --> B B --> C A --> D D --> E A --> F F --> G end C --> Join E --> Join G --> Join` const layout = layoutFlowchartDiagram(content) const b = layout.bounds.get("B")! const c = layout.bounds.get("C")! const d = layout.bounds.get("D")! const e = layout.bounds.get("E")! const verse = layout.subgraphBounds.get("Verse")! const joinRoutes = layout.routes.filter((route) => route.edge.to === "Join") const output = renderFlowchartDiagram(content)
expect(c.left).toBeGreaterThan(b.left) expect(e.left).toBeGreaterThan(d.left) expect(new Set(joinRoutes.map((route) => route.points[1]!.x)).size).toBe(1) expect(Math.max(...joinRoutes.flatMap((route) => route.points.map((point) => point.x)))).toBeGreaterThan( verse.left + verse.width, ) expect(output).not.toContain("││") })
test("routes transitions between local LR subgraphs outside their frames", () => { const layout = layoutFlowchartDiagram(`flowchart TD subgraph First [first] direction LR A[A] B[B] C[C] A --> B A --> C end B --> D C --> D subgraph Second [second] direction LR D[D] --> E[E] end`) const first = layout.subgraphBounds.get("First")! const second = layout.subgraphBounds.get("Second")! const routes = layout.routes.filter((route) => route.edge.to === "D")
expect(routes.length).toBe(2) for (const route of routes) { expect(routeRunsAlongHorizontalBorder(route, first)).toBe(false) expect(routeRunsAlongVerticalBorder(route, first)).toBe(false) expect(routeRunsAlongHorizontalBorder(route, second)).toBe(false) expect(routeRunsAlongVerticalBorder(route, second)).toBe(false) } })
test("keeps grouped fan routes orthogonal after subgraph translation", () => { const layout = layoutFlowchartDiagram(`flowchart LR Brief([Sketch Brief]) --> Parse[Parse Mermaid] subgraph Plan [Diagram Plan] Parse --> Layout[Rank Layout] Parse --> Cache[(Diagram Cache)] end Layout --> Preview([Terminal Preview]) Cache --> Preview`)
for (const route of layout.routes) { for (let index = 1; index < route.points.length; index++) { const from = route.points[index - 1]! const to = route.points[index]! expect(from.x === to.x || from.y === to.y).toBe(true) } } })
test("separates cross-dependent top-level subgraphs", () => { const content = `flowchart TD subgraph plugins["Plugins — one verb: attach"] chip["pr-indicator<br/>attach(prompt.footer, { after: 'directory' })"] theme["fancy-footer<br/>attach(prompt.footer, { replace: 'right' })"] end
subgraph host["Host anatomy tree — published, stable part IDs"] footer["prompt.footer"] left["left"] right["right<br/>(container)"] dir["directory"] model["model"] tokens["tokens"] footer --> left footer --> right right --> dir right --> model right --> tokens end
chip -- "insert after" --> dir theme == "takeover" ==> right theme -. "suppresses guests<br/>in subtree" .-> chip` const layout = layoutFlowchartDiagram(content) const plugins = layout.subgraphBounds.get("plugins")! const host = layout.subgraphBounds.get("host")! const output = renderFlowchartDiagram(content) const lines = output.split("\n")
expect(host.top).toBeGreaterThanOrEqual(plugins.top + plugins.height) expect(lines.filter((line) => line.includes("Plugins — one verb: attach"))).toHaveLength(1) expect(lines.filter((line) => line.includes("Host anatomy tree — published, stable part IDs"))).toHaveLength(1) expect(lines.findIndex((line) => line.includes("Host anatomy tree"))).toBeGreaterThan( lines.findIndex((line) => line.includes("Plugins — one verb")), ) for (const route of layout.routes) { for (let index = 1; index < route.points.length; index++) { const from = route.points[index - 1]! const to = route.points[index]! expect(from.x === to.x || from.y === to.y).toBe(true) } } })
test.each(["TD", "BT", "LR", "RL"] as const)( "keeps parallel top-level subgraphs in the same rank for %s diagrams", (direction) => { const layout = layoutFlowchartDiagram(`flowchart ${direction} subgraph source [Source] A[A] end subgraph left [Left] B[B] end subgraph right [Right] C[C] end A --> B A --> C`) const source = layout.subgraphBounds.get("source")! const left = layout.subgraphBounds.get("left")! const right = layout.subgraphBounds.get("right")! const leftNode = layout.bounds.get("B")! const rightNode = layout.bounds.get("C")! const horizontal = direction === "LR" || direction === "RL" const reversed = direction === "BT" || direction === "RL" const start = (bound: typeof source) => { const value = horizontal ? bound.left : bound.top const size = horizontal ? bound.width : bound.height return reversed ? -(value + size) : value } const size = (bound: typeof source) => (horizontal ? bound.width : bound.height)
expect(horizontal ? leftNode.centerX : leftNode.centerY).toBe(horizontal ? rightNode.centerX : rightNode.centerY) expect(Math.min(start(left), start(right))).toBeGreaterThanOrEqual(start(source) + size(source)) }, )
test.each(["TD", "BT", "LR", "RL"] as const)( "separates oversized parallel subgraph labels across %s diagrams", (direction) => { const horizontal = direction === "LR" || direction === "RL" const label = horizontal ? "one<br/>two<br/>three<br/>four<br/>five" : "A very very wide downstream subgraph title" const layout = layoutFlowchartDiagram(`flowchart ${direction} subgraph source [Source] A[A] end subgraph left [${label}] B[B] end subgraph right [Right] C[C] end A --> B A --> C`) const left = layout.subgraphBounds.get("left")! const right = layout.subgraphBounds.get("right")! const overlap = left.left < right.left + right.width && left.left + left.width > right.left && left.top < right.top + right.height && left.top + left.height > right.top
expect(overlap).toBe(false) }, )
test.each(["TD", "BT", "LR", "RL"] as const)( "ranks nested order-only subgraph dependencies for %s diagrams", (direction) => { const layout = layoutFlowchartDiagram(`flowchart ${direction} subgraph first [First] subgraph firstInner [First inner] A[A] end end subgraph second [Second] subgraph secondInner [Second inner] B[B] end end firstInner ~~~ secondInner`) const first = layout.subgraphBounds.get("first")! const second = layout.subgraphBounds.get("second")! const horizontal = direction === "LR" || direction === "RL" const reversed = direction === "BT" || direction === "RL" const start = (bound: typeof first) => { const value = horizontal ? bound.left : bound.top const size = horizontal ? bound.width : bound.height return reversed ? -(value + size) : value } const size = horizontal ? first.width : first.height
expect(start(second)).toBeGreaterThanOrEqual(start(first) + size) }, )
test.each(["TD", "BT", "LR", "RL"] as const)( "ranks cyclic top-level subgraphs as one downstream component for %s diagrams", (direction) => { const layout = layoutFlowchartDiagram(`flowchart ${direction} subgraph source [Source] A[A] end subgraph first [First] B[B] end subgraph second [Second] C[C] end A --> B B --> C C --> B`) const source = layout.subgraphBounds.get("source")! const first = layout.subgraphBounds.get("first")! const second = layout.subgraphBounds.get("second")! const horizontal = direction === "LR" || direction === "RL" const reversed = direction === "BT" || direction === "RL" const start = (bound: typeof source) => { const value = horizontal ? bound.left : bound.top const size = horizontal ? bound.width : bound.height return reversed ? -(value + size) : value } const size = (bound: typeof source) => (horizontal ? bound.width : bound.height)
expect(Math.min(start(first), start(second))).toBeGreaterThanOrEqual(start(source) + size(source)) }, )
test("moves subgraph labels away from crossing routes", () => { const output = renderFlowchartDiagram(`flowchart TD Payment -->|approved| Orders[(Orders DB)] Payment -->|declined| Retry([Retry]) Orders --> Receipt([Receipt]) subgraph Fulfill [Fulfillment] Orders[(Orders DB)] Receipt([Receipt]) end`) const lines = output.split("\n") const titleLineIndex = lines.findIndex((line) => line.includes("Fulfillment")) const ordersLineIndex = lines.findIndex((line) => line.includes("Orders DB"))
expect(titleLineIndex).toBeGreaterThan(ordersLineIndex) expect(lines[titleLineIndex]).not.toContain("approved") })
test("renders labeled vertical branches", () => { const output = renderFlowchartDiagram(`flowchart TD Input([Input]) --> Router[Route] Router -->|hit| Cache[(Cache)] Router -->|miss| Worker[Worker]`)
expect(output).toContain("Input") expect(output).toContain("Route") expect(output).toContain("Cache") expect(output).toContain("Worker") expect(output).toContain("hit") expect(output).toContain("miss") expect(output).toContain("▼") })
test("routes branch edges without diagonal glyphs", () => { const output = renderFlowchartDiagram(`graph LR Ticket([Ticket]) --> Triage[Auto Triage] Triage -->|billing| Billing[Billing Queue] Triage -->|bug| Bugs[(Bug Tracker)] Triage -->|question| Docs[Docs Reply] Billing --> Done([Closed]) Bugs --> Done Docs --> Done`)
expect(output).toContain("Billing Queue") expect(output).toContain("Bug Tracker") expect(output).toContain("Docs Reply") expect(output).toContain("┼") expect(output).not.toMatch(/[▲▼]│/) expect(output).not.toMatch(/[╱╲\\/]/) })
test("keeps vertical branch labels separated from return edges", () => { const output = renderFlowchartDiagram(`flowchart TD Cart([Cart]) --> Address[Address] Address --> Payment[Payment] Payment -->|approved| Orders[(Orders DB)] Payment -->|declined| Retry([Retry]) Retry --> Payment Orders --> Receipt([Receipt])`)
expect(output).toContain("approved") expect(output).toContain("declined") expect(output).not.toContain("approveddeclined") expect(output).not.toContain("declinedapproved") })
test("expands canvas to include back-edge labels", () => { const output = renderFlowchartDiagram(`flowchart TD A --> B B -->|again| A`)
expect(output).toContain("again") })
test("keeps vertical flowcharts compact with attached source connectors", () => { const output = renderFlowchartDiagram(`flowchart TD Cart([Cart]) --> Address[Address] Address --> Payment[Payment] Payment -->|approved| Orders[(Orders DB)] Payment -->|declined| Retry([Retry]) Retry --> Payment Orders --> Receipt([Receipt])`) const lines = output.split("\n") const cartConnectorLineIndex = lines.findIndex((line) => line.includes("┬")) const connectorColumn = [...lines[cartConnectorLineIndex]!].indexOf("┬")
expect(lines.length).toBeLessThanOrEqual(34) expect([...lines[cartConnectorLineIndex + 1]!][connectorColumn]).toBe("│") })
test("keeps short back-edge labels out of source nodes", () => { const output = renderFlowchartDiagram(`flowchart LR Build[Build Services] --> Test[Integration Tests] Test -->|pass| Canary[Canary] Test -->|fail| Fix[Fix Forward] Fix --> Build Canary -->|rollback| Fix`) const rollbackLine = output.split("\n").find((line) => line.includes("rollback"))
expect(rollbackLine).toBeDefined() expect(rollbackLine).not.toContain("Canary") expect(rollbackLine).not.toContain("Fix Forward") })
test("applies the global flowchart StyledText theme", () => { const grid = drawFlowchartDiagramGrid("flowchart LR\n A[Alpha] --> B[Beta]") const node = parseColor("#ff0000") const nodeBorder = parseColor("#0000ff") const styled = renderGridStyledText(grid, resolveFlowchartStyleColors({ node, nodeBorder }))
expect(styled.chunks.some((chunk) => chunk.text.includes("Alpha") && chunk.fg?.equals(node))).toBe(true) expect(styled.chunks.some((chunk) => chunk.text.includes("╭") && chunk.fg?.equals(nodeBorder))).toBe(true) })})