Breadcrumbs Max Width

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import { createContext, useContext } from "react";
import type {
  AnchorHTMLAttributes,
  HTMLAttributes,
  LiHTMLAttributes,
  ReactNode,
} from "react";

/**
 * DevSnips React Breadcrumbs — Max Width.
 *
 * Long labels are truncated inside a bounded max-width so a single verbose
 * level never breaks the trail. Truncation uses `truncate` on the label
 * span — the full label stays available through the `title` attribute
 * (auto-filled from string children, or pass `title` explicitly for
 * ReactNode labels), so the meaning is never lost to clipping. On narrow
 * screens the list wraps instead of overflowing the page.
 */
function cx(...parts: Array<string | false | null | undefined>): string {
  return parts.filter(Boolean).join(" ");
}

const LIST_CLASSES =
  "m-0 flex max-w-full list-none flex-wrap items-center gap-x-1 gap-y-0.5 p-0 text-sm leading-5";
const ITEM_CLASSES = "inline-flex min-w-0 items-center gap-1.5";
const LINK_CLASSES =
  "inline-flex min-w-0 max-w-[9rem] items-center gap-1.5 rounded-[var(--ds-radius-xs)] text-[var(--ds-color-muted-foreground)] underline-offset-4 sm:max-w-[14rem] transition-colors duration-150 ease-out hover:text-[var(--ds-color-foreground)] hover:underline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-[var(--ds-color-focus-ring)] motion-reduce:transition-none";
const CURRENT_CLASSES =
  "inline-flex min-w-0 max-w-[9rem] items-center gap-1.5 font-medium text-[var(--ds-color-foreground)] sm:max-w-[14rem]";
const SEPARATOR_CLASSES =
  "inline-flex shrink-0 select-none items-center justify-center text-[var(--ds-color-muted-foreground)] [&_svg]:size-3.5";
const ICON_CLASSES = "inline-flex shrink-0 text-[14px] [&_svg]:size-3.5";

const DEFAULT_SEPARATOR = (
  <svg
    viewBox="0 0 24 24"
    fill="none"
    stroke="currentColor"
    strokeWidth={1.75}
    strokeLinecap="round"
    strokeLinejoin="round"
    aria-hidden="true"
    focusable="false"
  >
    <path d="m9 6 6 6-6 6" />
  </svg>
);

interface BreadcrumbsContextValue {
  separator: ReactNode;
}

const BreadcrumbsContext = createContext<BreadcrumbsContextValue | null>(null);

function useBreadcrumbs(component: string): BreadcrumbsContextValue {
  const context = useContext(BreadcrumbsContext);
  if (!context) {
    throw new Error(`<${component}> must be rendered inside <Breadcrumbs>.`);
  }
  return context;
}

export interface BreadcrumbsProps extends HTMLAttributes<HTMLElement> {
  /** Accessible label for the navigation landmark. */
  label?: string;
  /** Default separator content used by every `<BreadcrumbSeparator>` without children. */
  separator?: ReactNode;
  className?: string;
  children?: ReactNode;
}

export function Breadcrumbs({
  label = "Breadcrumb",
  separator,
  className,
  children,
  ...rest
}: BreadcrumbsProps) {
  return (
    <BreadcrumbsContext.Provider value={{ separator: separator ?? DEFAULT_SEPARATOR }}>
      <nav aria-label={label} className={className} {...rest}>
        {children}
      </nav>
    </BreadcrumbsContext.Provider>
  );
}

export interface BreadcrumbListProps extends HTMLAttributes<HTMLOListElement> {
  className?: string;
  children?: ReactNode;
}

export function BreadcrumbList({ className, children, ...rest }: BreadcrumbListProps) {
  return (
    <ol className={cx(LIST_CLASSES, className)} {...rest}>
      {children}
    </ol>
  );
}

export interface BreadcrumbItemProps extends LiHTMLAttributes<HTMLLIElement> {
  className?: string;
  children?: ReactNode;
}

export function BreadcrumbItem({ className, children, ...rest }: BreadcrumbItemProps) {
  return (
    <li className={cx(ITEM_CLASSES, className)} {...rest}>
      {children}
    </li>
  );
}

export interface BreadcrumbLinkProps extends AnchorHTMLAttributes<HTMLAnchorElement> {
  /** Destination URL — rendered as a real anchor with normal browser navigation. */
  href: string;
  /** Meaningful leading icon (rendered aria-hidden). */
  icon?: ReactNode;
  className?: string;
  children?: ReactNode;
}

export function BreadcrumbLink({ href, icon, className, children, title, ...rest }: BreadcrumbLinkProps) {
  const fullLabel = title ?? (typeof children === "string" ? children : undefined);
  return (
    <a href={href} title={fullLabel} className={cx(LINK_CLASSES, className)} {...rest}>
      {icon ? (
        <span aria-hidden="true" className={ICON_CLASSES}>
          {icon}
        </span>
      ) : null}
      <span className="min-w-0 truncate">{children}</span>
    </a>
  );
}

export interface BreadcrumbCurrentProps extends HTMLAttributes<HTMLSpanElement> {
  /** Meaningful leading icon (rendered aria-hidden). */
  icon?: ReactNode;
  className?: string;
  children?: ReactNode;
}

export function BreadcrumbCurrent({ icon, className, children, title, ...rest }: BreadcrumbCurrentProps) {
  const fullLabel = title ?? (typeof children === "string" ? children : undefined);
  return (
    <span aria-current="page" title={fullLabel} className={cx(CURRENT_CLASSES, className)} {...rest}>
      {icon ? (
        <span aria-hidden="true" className={ICON_CLASSES}>
          {icon}
        </span>
      ) : null}
      <span className="min-w-0 truncate">{children}</span>
    </span>
  );
}

export interface BreadcrumbSeparatorProps extends LiHTMLAttributes<HTMLLIElement> {
  className?: string;
  children?: ReactNode;
}

export function BreadcrumbSeparator({ className, children, ...rest }: BreadcrumbSeparatorProps) {
  const context = useBreadcrumbs("BreadcrumbSeparator");
  return (
    <li
      role="presentation"
      aria-hidden="true"
      className={cx(SEPARATOR_CLASSES, className)}
      {...rest}
    >
      {children ?? context.separator}
    </li>
  );
}

export default Breadcrumbs;

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/* DevSnips React — JavaScript parity build.
 * Same API, behavior, and classes as code.tsx; TypeScript types removed.
 * Regenerated from code.tsx — edit code.tsx and re-run the generator.
 */

import { createContext, useContext } from "react";
function cx(...parts) {
  return parts.filter(Boolean).join(" ");
}
const LIST_CLASSES = "m-0 flex max-w-full list-none flex-wrap items-center gap-x-1 gap-y-0.5 p-0 text-sm leading-5";
const ITEM_CLASSES = "inline-flex min-w-0 items-center gap-1.5";
const LINK_CLASSES = "inline-flex min-w-0 max-w-[9rem] items-center gap-1.5 rounded-[var(--ds-radius-xs)] text-[var(--ds-color-muted-foreground)] underline-offset-4 sm:max-w-[14rem] transition-colors duration-150 ease-out hover:text-[var(--ds-color-foreground)] hover:underline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-[var(--ds-color-focus-ring)] motion-reduce:transition-none";
const CURRENT_CLASSES = "inline-flex min-w-0 max-w-[9rem] items-center gap-1.5 font-medium text-[var(--ds-color-foreground)] sm:max-w-[14rem]";
const SEPARATOR_CLASSES = "inline-flex shrink-0 select-none items-center justify-center text-[var(--ds-color-muted-foreground)] [&_svg]:size-3.5";
const ICON_CLASSES = "inline-flex shrink-0 text-[14px] [&_svg]:size-3.5";
const DEFAULT_SEPARATOR = <svg
  viewBox="0 0 24 24"
  fill="none"
  stroke="currentColor"
  strokeWidth={1.75}
  strokeLinecap="round"
  strokeLinejoin="round"
  aria-hidden="true"
  focusable="false"
>
    <path d="m9 6 6 6-6 6" />
  </svg>;
const BreadcrumbsContext = createContext(null);
function useBreadcrumbs(component) {
  const context = useContext(BreadcrumbsContext);
  if (!context) {
    throw new Error(`<${component}> must be rendered inside <Breadcrumbs>.`);
  }
  return context;
}
function Breadcrumbs({
  label = "Breadcrumb",
  separator,
  className,
  children,
  ...rest
}) {
  return <BreadcrumbsContext.Provider value={{ separator: separator ?? DEFAULT_SEPARATOR }}>
      <nav aria-label={label} className={className} {...rest}>
        {children}
      </nav>
    </BreadcrumbsContext.Provider>;
}
function BreadcrumbList({ className, children, ...rest }) {
  return <ol className={cx(LIST_CLASSES, className)} {...rest}>
      {children}
    </ol>;
}
function BreadcrumbItem({ className, children, ...rest }) {
  return <li className={cx(ITEM_CLASSES, className)} {...rest}>
      {children}
    </li>;
}
function BreadcrumbLink({ href, icon, className, children, title, ...rest }) {
  const fullLabel = title ?? (typeof children === "string" ? children : undefined);
  return <a href={href} title={fullLabel} className={cx(LINK_CLASSES, className)} {...rest}>
      {icon ? <span aria-hidden="true" className={ICON_CLASSES}>
          {icon}
        </span> : null}
      <span className="min-w-0 truncate">{children}</span>
    </a>;
}
function BreadcrumbCurrent({ icon, className, children, title, ...rest }) {
  const fullLabel = title ?? (typeof children === "string" ? children : undefined);
  return <span aria-current="page" title={fullLabel} className={cx(CURRENT_CLASSES, className)} {...rest}>
      {icon ? <span aria-hidden="true" className={ICON_CLASSES}>
          {icon}
        </span> : null}
      <span className="min-w-0 truncate">{children}</span>
    </span>;
}
function BreadcrumbSeparator({ className, children, ...rest }) {
  const context = useBreadcrumbs("BreadcrumbSeparator");
  return <li
    role="presentation"
    aria-hidden="true"
    className={cx(SEPARATOR_CLASSES, className)}
    {...rest}
  >
      {children ?? context.separator}
    </li>;
}

export { Breadcrumbs, BreadcrumbList, BreadcrumbItem, BreadcrumbLink, BreadcrumbCurrent, BreadcrumbSeparator };

export default Breadcrumbs;

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# Breadcrumbs Max Width

Breadcrumb trail that bounds long labels with max-width truncation while keeping the full text available through the title attribute — no clipped, meaningless navigation.

## Usage

```tsx
import Breadcrumbs, {
  BreadcrumbList,
  BreadcrumbItem,
  BreadcrumbLink,
  BreadcrumbCurrent,
  BreadcrumbSeparator,
} from "./breadcrumbs-max-width";

<Breadcrumbs>
  <BreadcrumbList>
    <BreadcrumbItem>
      <BreadcrumbLink href="/">Home</BreadcrumbLink>
    </BreadcrumbItem>
    <BreadcrumbSeparator />
    <BreadcrumbItem>
      <BreadcrumbLink href="/documentation/design-tokens">
        Design tokens and theming guidelines
      </BreadcrumbLink>
    </BreadcrumbItem>
    <BreadcrumbSeparator />
    <BreadcrumbItem>
      <BreadcrumbCurrent>Overriding tokens for white-label themes</BreadcrumbCurrent>
    </BreadcrumbItem>
  </BreadcrumbList>
</Breadcrumbs>

// Labels truncate at 9rem (14rem from sm up). The `title` attribute is
// auto-filled from string children — pass `title` explicitly when the
// label is a ReactNode:
<BreadcrumbLink href="/glossary" title="White-label theming">
  <em>White-label</em> theming
</BreadcrumbLink>
```

## JavaScript

A `code.jsx` build is provided for projects that ship plain JSX. It exposes the same API and behavior as `code.tsx` — only the TypeScript types are removed.

```jsx
import Breadcrumbs, {
  BreadcrumbList,
  BreadcrumbItem,
  BreadcrumbLink,
  BreadcrumbCurrent,
  BreadcrumbSeparator,
} from "./breadcrumbs-max-width";

<Breadcrumbs>
  <BreadcrumbList>
    <BreadcrumbItem>
      <BreadcrumbLink href="/">Home</BreadcrumbLink>
    </BreadcrumbItem>
    <BreadcrumbSeparator />
    <BreadcrumbItem>
      <BreadcrumbLink href="/documentation/design-tokens">
        Design tokens and theming guidelines
      </BreadcrumbLink>
    </BreadcrumbItem>
    <BreadcrumbSeparator />
    <BreadcrumbItem>
      <BreadcrumbCurrent>Overriding tokens for white-label themes</BreadcrumbCurrent>
    </BreadcrumbItem>
  </BreadcrumbList>
</Breadcrumbs>

// Labels truncate at 9rem (14rem from sm up). The `title` attribute is
// auto-filled from string children — pass `title` explicitly when the
// label is a ReactNode:
<BreadcrumbLink href="/glossary" title="White-label theming">
  <em>White-label</em> theming
</BreadcrumbLink>
```

## Props

### `<Breadcrumbs>`

| Name | Type | Default | Description |
|---|---|---|---|
| `label` | `string` | `"Breadcrumb"` | Accessible label for the `<nav>` landmark. |
| `separator` | `ReactNode` | chevron icon | Default separator content for every `<BreadcrumbSeparator>` without children. |
| `className` | `string` | — | Extra classes on the `<nav>`. |
| `children` | `ReactNode` | — | `BreadcrumbList` composition. |

### `<BreadcrumbList>`

| Name | Type | Default | Description |
|---|---|---|---|
| `className` | `string` | — | Extra classes on the `<ol>`. |
| `children` | `ReactNode` | — | `BreadcrumbItem` + `BreadcrumbSeparator` elements. |

### `<BreadcrumbItem>`

| Name | Type | Default | Description |
|---|---|---|---|
| `className` | `string` | — | Extra classes on the `<li>`. |
| `children` | `ReactNode` | — | Usually one `BreadcrumbLink` or `BreadcrumbCurrent`. |

### `<BreadcrumbLink>`

| Name | Type | Default | Description |
|---|---|---|---|
| `href` | `string` (required) | — | Destination URL — rendered as a real anchor with normal browser navigation. |
| `icon` | `ReactNode` | — | Meaningful leading icon (rendered `aria-hidden`). |
| `className` | `string` | — | Extra classes on the anchor. |
| `children` | `ReactNode` | — | Visible label. |

All native anchor attributes (`target`, `rel`, `aria-label`, `title`, …) are forwarded.

### `<BreadcrumbCurrent>`

| Name | Type | Default | Description |
|---|---|---|---|
| `icon` | `ReactNode` | — | Meaningful leading icon (rendered `aria-hidden`). |
| `className` | `string` | — | Extra classes on the span. |
| `children` | `ReactNode` | — | Visible label (rendered with `aria-current="page"`). |

### `<BreadcrumbSeparator>`

| Name | Type | Default | Description |
|---|---|---|---|
| `className` | `string` | — | Extra classes on the list item. |
| `children` | `ReactNode` | context `separator` | Custom separator content for this position only. |

## Composition

Breadcrumbs is a compound component. Six primitives compose the pattern:

```tsx
<Breadcrumbs>
  <BreadcrumbList>
    <BreadcrumbItem>
      <BreadcrumbLink href="/">Home</BreadcrumbLink>
    </BreadcrumbItem>
    <BreadcrumbSeparator />
    <BreadcrumbItem>
      <BreadcrumbLink href="/documentation">Documentation</BreadcrumbLink>
    </BreadcrumbItem>
    <BreadcrumbSeparator />
    <BreadcrumbItem>
      <BreadcrumbCurrent>Buttons</BreadcrumbCurrent>
    </BreadcrumbItem>
  </BreadcrumbList>
</Breadcrumbs>
```

- `Breadcrumbs` — the root `<nav aria-label="Breadcrumb">` landmark. Provides the default `separator` to every separator through context.
- `BreadcrumbList` — the ordered list (`<ol>`). Wraps onto multiple lines instead of scrolling horizontally.
- `BreadcrumbItem` — one level of the trail (`<li>`).
- `BreadcrumbLink` — a real `<a href>` for navigable levels: normal browser navigation, optional leading `icon`.
- `BreadcrumbCurrent` — the current page: plain text with `aria-current="page"`, never a link.
- `BreadcrumbSeparator` — decorative structure between levels (`role="presentation"`, `aria-hidden`); renders its own `children`, else the `separator` given to `<Breadcrumbs>`, else the default chevron.

Same six primitives — this variant bakes a bounded `max-w` + `truncate` into `BreadcrumbLink` and `BreadcrumbCurrent` and auto-fills `title` from string children, so truncation never destroys the meaning of the trail.

## Keyboard Interaction

| Key | Behavior |
|---|---|
| `Tab` / `Shift+Tab` | Move focus through the links |
| `Enter` | Follow the focused link |

## Accessibility

The structure follows the W3C Breadcrumb pattern: a `<nav aria-label="Breadcrumb">` landmark containing an ordered list (`<ol>`) whose last item is the current page marked with `aria-current="page"`.

- Every navigable level is a real `<a href>` — normal browser navigation, no click handlers faking links.
- The current page is plain text, not a link; assistive technology announces it as the current page.
- Separators are `aria-hidden` `role="presentation"` list items — never announced, never focusable.
- Icons are decorative (`aria-hidden`); the visible label always carries the accessible name.

Truncation is purely visual CSS (`truncate`) — the full label remains in the accessibility tree, so screen readers announce the complete text. The `title` attribute (auto-filled from string children, or passed explicitly for ReactNode labels) exposes the full text to sighted users on hover.

## States

- **Link** — muted foreground; hover shifts to the foreground color with an underline.
- **Current page** — foreground color at medium weight; not interactive.
- **Separator** — muted decorative glyph, hidden from assistive technology.
- **Focus-visible** — `--ds-color-focus-ring` outline on links and menu triggers in both themes.
- **Truncated label** — ends in an ellipsis inside `max-w-[9rem]` (`sm:max-w-[14rem]`); hovering reveals the native `title` tooltip with the full text.

## Responsive Behavior

Each label is capped at `max-w-[9rem]` below `sm` and `max-w-[14rem]` above, so no single verbose level can push the trail past the viewport. The list still wraps (`flex-wrap`) when several capped levels exceed the line — truncation bounds labels, wrapping handles volume. Neither creates page-level horizontal scrolling.

## Styling

Built with React, Tailwind CSS, and DevSnips design tokens. The component consumes the `--ds-*` semantic tokens via arbitrary values (for example `text-[var(--ds-color-muted-foreground)]`). Define the tokens once in your theme — no component-specific CSS file is required.

## Design Tokens

See [React/DESIGN_TOKENS.md](../../../DESIGN_TOKENS.md) for the authoritative token specification. This breadcrumb variant uses the semantic color, radius, typography, and motion tokens.

## Notes

Do not rely on `overflow-hidden` alone: without the `title` attribute and the full accessibility-tree text, clipping would destroy meaning. Tune the caps through the `LINK_CLASSES` / `CURRENT_CLASSES` constants if your density differs.