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THE // mechanic that separates this from a picture: clicking a node ISOLATES it — // every ancestor (any node with a path leading into it) and every descendant // (any node reachable from it) stays, everything else disappears — and the // remaining nodes/bands don't just get left at their old size with everyone // else dimmed: each surviving stage re-stacks from scratch using ONLY the // isolated subset's values, so the visible nodes and bands genuinely GROW to // fill the same vertical space the full graph used to occupy. Undoing the // isolation (Escape, or the "Show all" control) re-expands back to the full // graph. Pure DOM text + CSS, zero dependencies. // --------------------------------------------------------------------------- export interface SankeyNode { id: string; label: string; stage: number; value: number; } export interface SankeyLink { from: string; to: string; value: number; } export interface AsciiSankeyFlowProps { /** the diagram's nodes */ nodes?: SankeyNode[]; /** the flows between nodes */ links?: SankeyLink[]; /** extra classes merged onto the rendered root element */ className?: string; } const ASCII_RAMP = " .:-=+*#%@"; const STAGE_COUNT = 3; const NODE_W = 3; const BAND_W = 10; const ROWS_STAGE = 16; const CELL_W = 12; const CELL_H = 15; const TOP_PAD = 1; const COLS = STAGE_COUNT * NODE_W + (STAGE_COUNT - 1) * BAND_W + 2; const ROWS = ROWS_STAGE + TOP_PAD + 1; const DEFAULT_NODES: SankeyNode[] = [ { id: "search", label: "Search", stage: 0, value: 100 }, { id: "social", label: "Social", stage: 0, value: 60 }, { id: "referral", label: "Referral", stage: 0, value: 40 }, { id: "onboarded", label: "Onboarded", stage: 1, value: 125 }, { id: "bounced", label: "Bounced", stage: 1, value: 75 }, { id: "converted", label: "Converted", stage: 2, value: 100 }, { id: "churned", label: "Churned", stage: 2, value: 100 }, ]; const DEFAULT_LINKS: SankeyLink[] = [ { from: "search", to: "onboarded", value: 70 }, { from: "search", to: "bounced", value: 30 }, { from: "social", to: "onboarded", value: 30 }, { from: "social", to: "bounced", value: 30 }, { from: "referral", to: "onboarded", value: 25 }, { from: "referral", to: "bounced", value: 15 }, { from: "onboarded", to: "converted", value: 90 }, { from: "onboarded", to: "churned", value: 35 }, { from: "bounced", to: "converted", value: 10 }, { from: "bounced", to: "churned", value: 65 }, ]; interface Span { top: number; bottom: number; } // Cumulative-rounded 1D stacking — same technique as treemap-ascii-partition's // layoutSlice, collapsed to one axis: every boundary derives from the running // total so far, so adjacent spans always share an exact edge. function stackSpans(items: T[], top: number, bottom: number): Span[] { const total = items.reduce((s, i) => s + Math.max(0, i.value), 0) || 1; const height = bottom - top; let acc = 0; let cursor = top; return items.map((item) => { acc += Math.max(0, item.value); const next = top + Math.round((acc / total) * height); const span = { top: cursor, bottom: Math.max(cursor + 1, next) }; cursor = span.bottom; return span; }); } function stageCol(stage: number): number { return 1 + stage * (NODE_W + BAND_W); } // This used to read --foreground/--background/etc via getComputedStyle at // mount, hold them in state, and apply the result as raw hex through inline // `style` — a real bug, not a style choice, see diagram-ascii-flow's // component.tsx for the full story. Short version: SSR always renders with // no `document`, so the FIRST markup bakes in the light-theme fallback hex, // and because the client-computed value never CHANGES across renders (this // component recomputes the same "correct" dark hex every time), React never // patches it into the DOM — it only writes an attribute when the new // render's value differs from the PREVIOUS render's, not from what's // actually painted. Confirmed live here too: on a fresh load with dark mode // already saved (the anti-flash script sets `.dark` on `` before // hydration), every node rendered background rgb(255,255,255) against a // rgb(10,10,10) page. Tailwind classes bound to the same custom properties // sidestep the whole bug class: the cascade resolves --background per theme // at PAINT time, no JS or hydration step involved. // Every node reachable from `id` by walking edges backward (ancestors) or // forward (descendants) — the "isolate" set is {id} union both directions, // which is what makes it a real subgraph isolation rather than a 1-hop // highlight. function reachable(id: string, links: SankeyLink[], direction: "forward" | "backward"): Set { const out = new Set(); const frontier = [id]; while (frontier.length) { const cur = frontier.pop()!; for (const link of links) { const next = direction === "forward" ? (link.from === cur ? link.to : null) : link.to === cur ? link.from : null; if (next && !out.has(next)) { out.add(next); frontier.push(next); } } } return out; } export function AsciiSankeyFlow({ nodes = DEFAULT_NODES, links = DEFAULT_LINKS, className = "", }: AsciiSankeyFlowProps) { const [selectedId, setSelectedId] = useState(null); const [hoverId, setHoverId] = useState(null); const isolatedIds = useMemo(() => { if (!selectedId) return null; const ancestors = reachable(selectedId, links, "backward"); const descendants = reachable(selectedId, links, "forward"); return new Set([selectedId, ...ancestors, ...descendants]); }, [selectedId, links]); const visibleNodes = useMemo( () => (isolatedIds ? nodes.filter((n) => isolatedIds.has(n.id)) : nodes), [nodes, isolatedIds] ); const visibleLinks = useMemo( () => isolatedIds ? links.filter((l) => isolatedIds.has(l.from) && isolatedIds.has(l.to)) : links, [links, isolatedIds] ); // per-stage vertical spans, restacked from ONLY the currently visible // nodes' values — this is the re-weight: an isolated subset's nodes claim // the full ROWS_STAGE height among just themselves, not a subset of the // full graph's original spans. const nodeSpan = useMemo(() => { const map = new Map(); for (let stage = 0; stage < STAGE_COUNT; stage++) { const stageNodes = visibleNodes.filter((n) => n.stage === stage); const spans = stackSpans(stageNodes, TOP_PAD, TOP_PAD + ROWS_STAGE); stageNodes.forEach((n, i) => map.set(n.id, spans[i])); } return map; }, [visibleNodes]); // per-node, per-link sub-spans (outgoing sub-spans partition the node's // own span for bands leaving it; incoming sub-spans partition it for bands // arriving) — same cumulative stacking, one level down. const linkSpan = useMemo(() => { const outMap = new Map(); // keyed by `${link.from}->${link.to}` const inMap = new Map(); for (const node of visibleNodes) { const outgoing = visibleLinks.filter((l) => l.from === node.id); const incoming = visibleLinks.filter((l) => l.to === node.id); const span = nodeSpan.get(node.id); if (!span) continue; const outSpans = stackSpans(outgoing, span.top, span.bottom); outgoing.forEach((l, i) => outMap.set(`${l.from}->${l.to}`, outSpans[i])); const inSpans = stackSpans(incoming, span.top, span.bottom); incoming.forEach((l, i) => inMap.set(`${l.from}->${l.to}`, inSpans[i])); } return { outMap, inMap }; }, [visibleNodes, visibleLinks, nodeSpan]); const maxLinkValue = useMemo(() => Math.max(1, ...visibleLinks.map((l) => l.value)), [visibleLinks]); const rows = useMemo(() => { const cells: string[][] = Array.from({ length: ROWS }, () => Array(COLS).fill(" ")); for (const link of visibleLinks) { const srcNode = visibleNodes.find((n) => n.id === link.from); const dstNode = visibleNodes.find((n) => n.id === link.to); if (!srcNode || !dstNode) continue; const srcSpan = linkSpan.outMap.get(`${link.from}->${link.to}`); const dstSpan = linkSpan.inMap.get(`${link.from}->${link.to}`); if (!srcSpan || !dstSpan) continue; const srcRight = stageCol(srcNode.stage) + NODE_W; const dstLeft = stageCol(dstNode.stage) - 1; const level = Math.max(1, Math.round((link.value / maxLinkValue) * (ASCII_RAMP.length - 1))); const ch = ASCII_RAMP[level]; for (let x = srcRight; x <= dstLeft; x++) { const t = dstLeft > srcRight ? (x - srcRight) / (dstLeft - srcRight) : 0; const top = srcSpan.top + (dstSpan.top - srcSpan.top) * t; const bottom = srcSpan.bottom + (dstSpan.bottom - srcSpan.bottom) * t; for (let y = Math.round(top); y < Math.round(bottom); y++) { if (y >= 0 && y < ROWS && x >= 0 && x < COLS) cells[y][x] = ch; } } } return cells.map((r) => r.join("")); }, [visibleLinks, visibleNodes, linkSpan, maxLinkValue]); const connectionsCount = (id: string) => links.filter((l) => l.from === id || l.to === id).length; return (

{/* Each character is its own fixed-width span rather than one flowing text string per row: a browser's real monospace glyph advance almost never equals CELL_W exactly, and the bands must land on the SAME px grid the absolutely-positioned node buttons use — a flowing string drifts column alignment cumulatively across the row until bands land under the wrong node entirely. */}

{rows.map((line, y) => (

{line.split("").map((ch, x) => ( {ch} ))}

))}

{visibleNodes.map((n) => { const span = nodeSpan.get(n.id); if (!span) return null; const selected = selectedId === n.id; const hovered = hoverId === n.id; const col = stageCol(n.stage); return ( ); })}

{selectedId ? ( Isolated: {nodes.find((n) => n.id === selectedId)?.label} —{" "} {visibleNodes.length} of {nodes.length} nodes ) : ( Click a node to isolate its upstream and downstream flow. )}

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