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import type {
RouterLinkAttributes,
RouterLinkProps,
RouterLinkResolved,
RouterLinkType
} from './types';
// Constants definition
const CSS_CLASSES = {
BASE: 'router-link',
ACTIVE: 'router-link-active',
EXACT_ACTIVE: 'router-link-exact-active'
} satisfies Record<string, string>;
/**
* Normalize navigation type with backward compatibility for deprecated replace property
*/
function normalizeNavigationType(props: RouterLinkProps): RouterLinkType {
if (props.replace) {
console.warn(
'[RouterLink] The `replace` property is deprecated and will be removed in a future version.\n' +
'Please use `type="replace"` instead.\n' +
'Before: <RouterLink replace={true} />\n' +
'After: <RouterLink type="replace" />'
);
return 'replace';
}
return props.type || 'push';
}
/**
* Get event type list - normalize and validate event types
*/
function getEventTypeList(eventType: unknown | unknown[]): string[] {
const events = Array.isArray(eventType) ? eventType : [eventType];
const validEvents = events
.filter((type): type is string => typeof type === 'string')
.map((type) => type.trim())
.filter(Boolean);
return validEvents.length ? validEvents : ['click'];
}
/**
* Navigation event handler called before navigation - determines if the router should handle the navigation
*
* Returns false: Let browser handle default behavior (normal link navigation)
* Returns true: Router takes over navigation, prevents default browser behavior
*
* This function intelligently decides when to let the browser handle clicks
* (like Ctrl+click for new tabs) vs when to use SPA routing
*/
function shouldHandleNavigation(e: Event): boolean {
if (e.defaultPrevented) return false;
if (e instanceof MouseEvent) {
if (e.metaKey || e.altKey || e.ctrlKey || e.shiftKey) return false;
if (e.button !== undefined && e.button !== 0) return false;
}
e.preventDefault?.();
return true;
}
/**
* Execute route navigation
*/
async function executeNavigation(
router: Router,
props: RouterLinkProps,
linkType: RouterLinkType
): Promise<void> {
const { to, layerOptions } = props;
switch (linkType) {
case 'push':
await router.push(to);
break;
case 'replace':
await router.replace(to);
break;
case 'pushWindow':
await router.pushWindow(to);
break;
case 'replaceWindow':
await router.replaceWindow(to);
break;
case 'pushLayer':
await router.pushLayer(
layerOptions
? typeof to === 'string'
? { path: to, layer: layerOptions }
: { ...to, layer: layerOptions }
: to
);
break;
default:
await router.push(to);
}
}
/**
* Create navigation function
*/
function createNavigateFunction(
router: Router,
props: RouterLinkProps,
navigationType: RouterLinkType
): RouterLinkResolved['navigate'] {
return async (e: Event): Promise<void> => {
if (shouldHandleNavigation(e)) {
await executeNavigation(router, props, navigationType);
}
};
}
/**
* Compute HTML attributes
*/
function computeAttributes(
href: string,
navigationType: RouterLinkType,
isExternal: boolean,
isActive: boolean,
isExactActive: boolean,
activeClass?: string
): RouterLinkAttributes {
// Only pushWindow opens in a new window, replaceWindow replaces current window
const isNewWindow = navigationType === 'pushWindow';
// Build CSS classes
const classes: string[] = [CSS_CLASSES.BASE];
if (isActive) {
classes.push(activeClass || CSS_CLASSES.ACTIVE);
}
if (isExactActive) {
classes.push(CSS_CLASSES.EXACT_ACTIVE);
}
const attributes: RouterLinkAttributes = {
href,
class: classes.join(' ')
};
// Set target for new window
if (isNewWindow) {
attributes.target = '_blank';
}
// Build rel attribute
const relParts: string[] = [];
if (isNewWindow) {
relParts.push('noopener', 'noreferrer');
}
if (isExternal) {
relParts.push('external', 'nofollow');
}
if (relParts.length > 0) {
attributes.rel = relParts.join(' ');
}
return attributes;
}
/**
* Create event handlers generator function
*/
function createEventHandlersGenerator(
router: Router,
props: RouterLinkProps,
navigationType: RouterLinkType,
eventTypes: string[]
): RouterLinkResolved['createEventHandlers'] {
return (format?: (eventType: string) => string) => {
const handlers: Record<string, (e: Event) => Promise<void>> = {};
const navigate = createNavigateFunction(router, props, navigationType);
eventTypes.forEach((eventType) => {
const eventName = format?.(eventType) ?? eventType.toLowerCase();
handlers[eventName] = (event) => {
props.beforeNavigate?.(event, eventType);
return navigate(event);
};
});
return handlers;
};
}
/**
* Framework-agnostic link resolver
*
* @param router Router instance
* @param props Link configuration
* @returns Resolution result
*/
export function createLinkResolver(
router: Router,
props: RouterLinkProps
): RouterLinkResolved {
const route = router.resolve(props.to);
const type = normalizeNavigationType(props);
const href = route.url.href;
const isActive = router.isRouteMatched(route, props.exact);
const isExactActive = router.isRouteMatched(route, 'exact');
const isExternal = route.url.origin !== router.route.url.origin;
const attributes = computeAttributes(
href,
type,
isExternal,
isActive,
isExactActive,
props.activeClass
);
const eventTypes = getEventTypeList(props.event || 'click');
const createEventHandlers = createEventHandlersGenerator(
router,
props,
type,
eventTypes
);
const navigate = createNavigateFunction(router, props, type);
return {
route,
type,
isActive,
isExactActive,
isExternal,
tag: props.tag || 'a',
attributes,
navigate,
createEventHandlers
};
}
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