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Every retrieved // chunk is placed on x by RANK (highest similarity leftmost, 1fr per column) // and on y by SCORE relative to the cutoff. A chunk whose score clears the // cutoff RESTS ON the rule as a solid hairline card — mono doc id, char span, // a 34px score bar — lifted (score − cutoff) × 240px above it. A chunk that // misses FALLS THROUGH: a bare 1px stub at 0.38 alpha, only its doc id, sunk // (cutoff − score) × 300px below the rule and tapering 1fr → 40% wide as it // falls. So the resting composition is one hard boundary with the ink packed // against it: six solid rows above, a thin dust of ghosts below, most of the // lower frame empty. // // The second, harder question a retrieval panel usually hides is which of the // retained chunks the answer actually USED. An ANSWER RAIL (1px --border) runs // above the retained zone; a chunk with used:true draws a 1px connector from // its right edge up to the rail, ending in a 3px filled square. A retained but // uncited chunk draws NOTHING. "Retrieved and never cited" — the real RAG // failure mode — is therefore visible as absence, with no badge and no color. // // The rule is the control: it is a real role="slider", and a vertical drag on // it maps 1px = 0.004 score. Chunks crossing the new cutoff reflow between the // two zones on one shared 240ms transform+opacity transition — the reflow IS // the feedback, there is no separate readout animation. // // Ink is --foreground / --border / --ns-muted throughout; --ns-accent is spent only // on focus rings. DOM + CSS only, no canvas, no SVG, no measurement pass. // --------------------------------------------------------------------------- export interface SieveChunk { id: string; /** Short source identifier, e.g. "runbook.md". Rendered in mono. */ doc: string; /** Character offsets of the chunk inside its document: [start, end]. */ span: [number, number]; /** Similarity score, 0…1. Drives both zone and height. */ score: number; /** True when the generated answer actually cited this chunk. */ used?: boolean; /** Chunk text, shown in the strip pinned to the frame's bottom edge on hover. */ preview: string; } export interface ChunkSieveProps { /** Retrieved chunks. Rank on screen is derived from score, not array order. */ chunks: SieveChunk[]; /** Controlled similarity cutoff, 0…1. */ cutoff?: number; /** Initial cutoff when uncontrolled. @default 0.5 */ defaultCutoff?: number; /** Fires on release / keypress with the value snapped to 3 decimals. */ onCutoffChange?: (cutoff: number) => void; /** Frame height in px — the sieve's geometry is absolute, not fluid. @default 440 */ height?: number; /** Accessible name for the cutoff slider. @default "Similarity cutoff" */ label?: string; /** extra classes merged onto the rendered root element */ className?: string; } const LINE_PCT = 0.42; // the sieve rule's height in the frame const LIFT_PER_SCORE = 240; // px of lift per 1.0 of score above the cutoff const DROP_PER_SCORE = 300; // px of fall per 1.0 of score below the cutoff const CARD_H = 52; // retained card height (fixed, so connectors need no measuring) const RAIL_TOP = 24; // answer rail, px from the frame's inner top const RAIL_GAP = 14; // minimum clearance between a lifted card and the rail const SCORE_BAR_W = 34; const PX_PER_SCORE = 0.004; // drag sensitivity: 1px = 0.004 score const STUB_MIN_W = 40; // % width a stub tapers to at the bottom of its fall // Stub alpha. 0.38 is the floor at which a 1px --foreground hairline and 9px // mono are still legible in BOTH themes (~2.6:1 light, ~3.0:1 dark); the // original 0.14 composited to ~1.35:1 in both, i.e. not rendered — which // deleted the "falls through" half of the sieve from the resting frame. const STUB_ALPHA = 0.38; const STUB_ALPHA_DIM = 0.15; // a stub while some other chunk is hovered function clamp01(v: number): number { return v < 0 ? 0 : v > 1 ? 1 : v; } function round3(v: number): number { return Math.round(v * 1000) / 1000; } function fmt3(v: number): string { return v.toFixed(3); } export function ChunkSieve({ chunks, cutoff, defaultCutoff = 0.5, onCutoffChange, height = 440, label = "Similarity cutoff", className = "", }: ChunkSieveProps) { const isControlled = cutoff !== undefined; const [internal, setInternal] = useState(() => clamp01(defaultCutoff)); // Live drag value overrides both, so a controlled consumer still sees the // reflow while the pointer is down even though onCutoffChange fires on release. const [live, setLive] = useState(null); const committed = clamp01(isControlled ? cutoff! : internal); const value = live ?? committed; const [hovered, setHovered] = useState(null); const [arrived, setArrived] = useState([]); const prevRetained = useRef | null>(null); const dragRef = useRef<{ y: number; from: number } | null>(null); const arriveTimer = useRef(null); const ordered = [...chunks].sort((a, b) => b.score - a.score); const retainedCount = ordered.filter((c) => c.score >= value).length; const lineY = height * LINE_PCT; const maxLift = Math.max(0, lineY - CARD_H - RAIL_TOP - RAIL_GAP); const maxDrop = Math.max(1, height - lineY - 28); // Newly retained chunks pulse once on arrival. useEffect(() => { const now = new Set( chunks.filter((c) => c.score >= value).map((c) => c.id) ); const prev = prevRetained.current; prevRetained.current = now; if (!prev) return; const fresh: string[] = []; now.forEach((id) => { if (!prev.has(id)) fresh.push(id); }); if (fresh.length === 0) return; setArrived(fresh); // The timer lives in a ref, not in the effect's cleanup: `value` changes on // every frame of a drag, and an effect-scoped cleanup would cancel the // pending clear on the very next frame, leaving `arrived` stuck with stale // ids so those chunks could never pulse again on re-entry. if (arriveTimer.current !== null) window.clearTimeout(arriveTimer.current); arriveTimer.current = window.setTimeout(() => { arriveTimer.current = null; setArrived([]); }, 900); }, [value, chunks]); useEffect( () => () => { if (arriveTimer.current !== null) window.clearTimeout(arriveTimer.current); }, [] ); const commit = (next: number) => { const v = round3(clamp01(next)); if (!isControlled) setInternal(v); if (v !== round3(committed)) onCutoffChange?.(v); }; const onPointerDown = (e: React.PointerEvent) => { dragRef.current = { y: e.clientY, from: value }; e.currentTarget.setPointerCapture(e.pointerId); setLive(value); }; const onPointerMove = (e: React.PointerEvent) => { const d = dragRef.current; if (!d) return; // Dragging the rule DOWN lowers the bar: more chunks clear it. setLive(clamp01(d.from - (e.clientY - d.y) * PX_PER_SCORE)); }; const endDrag = () => { const d = dragRef.current; if (!d) return; dragRef.current = null; const v = live; setLive(null); if (v !== null) commit(v); }; const onKeyDown = (e: React.KeyboardEvent) => { let next: number | null = null; if (e.key === "ArrowUp" || e.key === "ArrowRight") next = value + 0.01; else if (e.key === "ArrowDown" || e.key === "ArrowLeft") next = value - 0.01; else if (e.key === "PageUp") next = value + 0.1; else if (e.key === "PageDown") next = value - 0.1; else if (e.key === "Home") next = 0; else if (e.key === "End") next = 1; else return; e.preventDefault(); setLive(null); commit(next); }; const hoveredChunk = hovered ? chunks.find((c) => c.id === hovered) : undefined; const readout = `cutoff ${fmt3(value)} · ${retainedCount}/${chunks.length} retained`; return (

{/* ---- answer rail ---- */}

{/* ---- live readout, sitting just above the rule ---- aria-hidden on purpose: the slider's aria-valuetext already carries "cutoff 0.742, 6 of 12 chunks retained", so an aria-live copy of the same string would double-announce on every arrow key and on every frame of a drag. */} {/* ---- chunk columns ---- */}

{ordered.map((c) => { const retained = c.score >= value; const isHovered = hovered === c.id; const dim = hovered !== null && !isHovered; const spanText = `[${c.span[0]}-${c.span[1]}]`; // No `border-0`/`bg-transparent` here: preflight already resets both // on

); } const drop = Math.min(maxDrop, (value - c.score) * DROP_PER_SCORE); const taper = clamp01(drop / maxDrop); return (

); })}

{/* ---- the sieve rule: the control ---- The focus ring uses a NEGATIVE outline-offset on purpose: the grab strip runs edge to edge, so an outward offset pushes its left/right caps under the frame's overflow-hidden and the ring degrades into two loose horizontal lines. */}

{/* ---- preview strip, pinned to the frame's bottom edge ---- */}

{hoveredChunk ? ( <> {hoveredChunk.doc} {" "} [{hoveredChunk.span[0]}-{hoveredChunk.span[1]}] ·{" "} {fmt3(hoveredChunk.score)} ·{" "} {hoveredChunk.score >= value ? hoveredChunk.used ? "cited" : "retained, not cited" : "below cutoff"} — {hoveredChunk.preview} ) : ( " " )}

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