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export default interface NavigationPresenter {
openHistoryPrev(): void;
openHistoryNext(): void;
openLinkPrev(): void;
openLinkNext(): void;
}
const REL_PATTERN: {[key: string]: RegExp} = {
prev: /^(?:prev(?:ious)?|older)\b|\u2039|\u2190|\xab|\u226a|<</i,
next: /^(?:next|newer)\b|\u203a|\u2192|\xbb|\u226b|>>/i,
};
// Return the last element in the document matching the supplied selector
// and the optional filter, or null if there are no matches.
// eslint-disable-next-line func-style
function selectLast<E extends Element>(
selector: string,
filter?: (e: E) => boolean,
): E | null {
let nodes = Array.from(
window.document.querySelectorAll(selector) as NodeListOf<E>
);
if (filter) {
nodes = nodes.filter(filter);
}
return nodes.length ? nodes[nodes.length - 1] : null;
}
export class NavigationPresenterImpl implements NavigationPresenter {
openHistoryPrev(): void {
window.history.back();
}
openHistoryNext(): void {
window.history.forward();
}
openLinkPrev(): void {
this.linkRel('prev');
}
openLinkNext(): void {
this.linkRel('next');
}
// Code common to linkPrev and linkNext which navigates to the specified page.
private linkRel(rel: 'prev' | 'next'): void {
let link = selectLast<HTMLLinkElement>(`link[rel~=${rel}][href]`);
if (link) {
window.location.href = link.href;
return;
}
const pattern = REL_PATTERN[rel];
let a = selectLast<HTMLAnchorElement>(`a[rel~=${rel}][href]`) ||
// `innerText` is much slower than `textContent`, but produces much better
// (i.e. less unexpected) results
selectLast('a[href]', lnk => pattern.test(lnk.innerText));
if (a) {
a.click();
}
}
}
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