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Granting a permission punches a clean // circular hole through the card stock; revoking never un-punches — it pastes // a visible patch over the hole instead, leaving the hole's rim peeking 1px // around the patch and its torn corners permanent for the session. Re-granting // punches straight through the existing patch (a smaller hole cut through its // centre), so a cell that was ever revoked stays visibly distinct from one // that was never touched, forever, regardless of its current state. Inherited // grants render as sealed eyelets — solid rim + inner ring, non-interactive, // with a tooltip naming the parent role. Dependencies (grant X requires Y) // share one punch-bar motion across both cells instead of two animations run // back to back. Pure DOM + SVG, tokens only, reduced motion swaps instantly. // --------------------------------------------------------------------------- export interface PunchPatchRole { id: string; name: string; } export interface PunchPatchPermission { id: string; name: string; /** id of another permission in the same set this one depends on; granting * this one cascades a grant of the dependency first, if it isn't held. */ requires?: string; } export interface PunchPatchGrant { roleId: string; permissionId: string; } export interface PunchPatchInherited extends PunchPatchGrant { /** name of the parent role this grant is inherited from */ from: string; } export interface PunchPatchProps { /** accessible name for the whole matrix */ label?: string; /** row headers */ roles: PunchPatchRole[]; /** column headers */ permissions: PunchPatchPermission[]; /** cells punched (granted) at mount */ defaultGranted?: PunchPatchGrant[]; /** cells with a punch-then-patch history at mount: currently off, previously granted */ defaultRevoked?: PunchPatchGrant[]; /** cells granted via role inheritance — rendered as sealed, non-interactive eyelets */ inherited?: PunchPatchInherited[]; /** fires with the current directly-held (non-inherited) grants after any toggle */ onChange?: (grants: PunchPatchGrant[]) => void; /** extra classes merged onto the rendered root element */ className?: string; } interface CellState { granted: boolean; /** sticky for the session once true: this cell has been revoked at least once */ patched: boolean; } const key = (roleId: string, permId: string) => `${roleId}::${permId}`; function useReducedMotion() { return useRef( typeof window !== "undefined" && window.matchMedia("(prefers-reduced-motion: reduce)").matches, ).current; } function buildInitialCells( granted: PunchPatchGrant[], revoked: PunchPatchGrant[], ): Map { const m = new Map(); for (const g of granted) m.set(key(g.roleId, g.permissionId), { granted: true, patched: false }); for (const r of revoked) m.set(key(r.roleId, r.permissionId), { granted: false, patched: true }); return m; } interface PunchBar { id: number; left: number; top: number; width: number; } export function PunchPatch({ label = "Role permissions", roles, permissions, defaultGranted = [], defaultRevoked = [], inherited = [], onChange, className = "", }: PunchPatchProps) { const reduced = useReducedMotion(); const baseId = useId(); const patchedDescId = `${baseId}-patched-desc`; const [cells, setCells] = useState>(() => buildInitialCells(defaultGranted, defaultRevoked), ); const [focusedR, setFocusedR] = useState(0); const [focusedP, setFocusedP] = useState(0); const [punchBar, setPunchBar] = useState(null); const chadEverRef = useRef>(new Set()); const gridWrapRef = useRef(null); const cellRefs = useRef>(new Map()); const liveRef = useRef(null); const barIdRef = useRef(0); const barTimeoutRef = useRef(null); const inheritedMap = useMemo(() => { const m = new Map(); for (const i of inherited) m.set(key(i.roleId, i.permissionId), i.from); return m; }, [inherited]); const permById = useMemo(() => { const m = new Map(); for (const p of permissions) m.set(p.id, p); return m; }, [permissions]); const announce = (text: string) => { if (liveRef.current) liveRef.current.textContent = text; }; const emitChange = (next: Map) => { if (!onChange) return; const out: PunchPatchGrant[] = []; for (const role of roles) { for (const perm of permissions) { if (next.get(key(role.id, perm.id))?.granted) { out.push({ roleId: role.id, permissionId: perm.id }); } } } onChange(out); }; const triggerPunchBar = (roleId: string, fromPermId: string, toPermId: string) => { if (reduced) return; const wrap = gridWrapRef.current; const fromEl = cellRefs.current.get(key(roleId, fromPermId)); const toEl = cellRefs.current.get(key(roleId, toPermId)); if (!wrap || !fromEl || !toEl) return; const wr = wrap.getBoundingClientRect(); const fr = fromEl.getBoundingClientRect(); const tr = toEl.getBoundingClientRect(); const left = Math.min(fr.left, tr.left) - wr.left; const right = Math.max(fr.right, tr.right) - wr.left; if (barTimeoutRef.current) window.clearTimeout(barTimeoutRef.current); barIdRef.current += 1; setPunchBar({ id: barIdRef.current, left, top: fr.top - wr.top + fr.height / 2 - 1.5, width: right - left, }); barTimeoutRef.current = window.setTimeout(() => setPunchBar(null), 340); }; // Reads `cells` from the render closure rather than a functional setState // updater on purpose: toggle only ever runs from a discrete click/keydown, // one at a time, each committed before the next can fire — so there's no // batching hazard here. That keeps onChange/announce/triggerPunchBar (each // itself a state update) out of the updater function, where React would // otherwise double-invoke them under StrictMode and warn about setState // during another component's render. const toggle = (roleId: string, roleName: string, permId: string) => { const k = key(roleId, permId); if (inheritedMap.has(k)) return; const cur = cells.get(k) ?? { granted: false, patched: false }; const next = new Map(cells); const perm = permById.get(permId); const permName = perm?.name ?? permId; if (cur.granted) { next.set(k, { granted: false, patched: true }); setCells(next); announce(`${permName} revoked for ${roleName}. Previously granted.`); emitChange(next); return; } next.set(k, { granted: true, patched: cur.patched }); chadEverRef.current.add(k); let cascadeName: string | null = null; let cascadeReqId: string | null = null; const reqId = perm?.requires; if (reqId) { const reqKey = key(roleId, reqId); const reqCur = cells.get(reqKey) ?? { granted: false, patched: false }; if (!reqCur.granted) { next.set(reqKey, { granted: true, patched: reqCur.patched }); chadEverRef.current.add(reqKey); cascadeName = permById.get(reqId)?.name ?? reqId; cascadeReqId = reqId; } } setCells(next); if (cascadeReqId) triggerPunchBar(roleId, permId, cascadeReqId); announce( cascadeName ? `${permName} granted for ${roleName}. Also granted: ${cascadeName}.` : `${permName} granted for ${roleName}.`, ); emitChange(next); }; const colTemplate = `10rem repeat(${permissions.length}, minmax(3.25rem, 1fr))`; const moveFocus = (nr: number, np: number) => { const r = Math.min(Math.max(nr, 0), roles.length - 1); const p = Math.min(Math.max(np, 0), permissions.length - 1); setFocusedR(r); setFocusedP(p); cellRefs.current.get(key(roles[r].id, permissions[p].id))?.focus(); }; const onGridKeyDown = (e: ReactKeyboardEvent) => { switch (e.key) { case "ArrowRight": e.preventDefault(); moveFocus(focusedR, focusedP + 1); return; case "ArrowLeft": e.preventDefault(); moveFocus(focusedR, focusedP - 1); return; case "ArrowDown": e.preventDefault(); moveFocus(focusedR + 1, focusedP); return; case "ArrowUp": e.preventDefault(); moveFocus(focusedR - 1, focusedP); return; case "Home": e.preventDefault(); moveFocus(focusedR, 0); return; case "End": e.preventDefault(); moveFocus(focusedR, permissions.length - 1); return; default: return; } }; return (

{label}

{punchBar && (

)}

Role

{permissions.map((perm) => (

{perm.name}

))}

{roles.map((role, r) => (

{role.name}

{permissions.map((perm, p) => { const k = key(role.id, perm.id); const from = inheritedMap.get(k); const isInherited = from !== undefined; const cell = cells.get(k) ?? { granted: false, patched: false }; const isTabbable = r === focusedR && p === focusedP; const tipId = `${baseId}-tip-${role.id}-${perm.id}`; const showChad = !reduced && cell.granted && chadEverRef.current.has(k); if (isInherited) { return (

); } const describedBy = !cell.granted && cell.patched ? patchedDescId : undefined; return (

); })}

))}

Previously granted, later revoked.

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