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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>(
win: Window,
selector: string,
filter?: (e: E) => boolean,
): E | null {
let nodes = Array.from(
win.document.querySelectorAll(selector) as NodeListOf<E>
);
if (filter) {
nodes = nodes.filter(filter);
}
return nodes.length ? nodes[nodes.length - 1] : null;
}
const historyPrev = (win: Window): void => {
win.history.back();
};
const historyNext = (win: Window): void => {
win.history.forward();
};
// Code common to linkPrev and linkNext which navigates to the specified page.
const linkRel = (win: Window, rel: string): void => {
let link = selectLast<HTMLLinkElement>(win, `link[rel~=${rel}][href]`);
if (link) {
win.location.href = link.href;
return;
}
const pattern = REL_PATTERN[rel];
let a = selectLast<HTMLAnchorElement>(win, `a[rel~=${rel}][href]`) ||
// `innerText` is much slower than `textContent`, but produces much better
// (i.e. less unexpected) results
selectLast(win, 'a[href]', lnk => pattern.test(lnk.innerText));
if (a) {
a.click();
}
};
const linkPrev = (win: Window): void => {
linkRel(win, 'prev');
};
const linkNext = (win: Window): void => {
linkRel(win, 'next');
};
const parent = (win: Window): void => {
const loc = win.location;
if (loc.hash !== '') {
loc.hash = '';
return;
} else if (loc.search !== '') {
loc.search = '';
return;
}
const basenamePattern = /\/[^/]+$/;
const lastDirPattern = /\/[^/]+\/$/;
if (basenamePattern.test(loc.pathname)) {
loc.pathname = loc.pathname.replace(basenamePattern, '/');
} else if (lastDirPattern.test(loc.pathname)) {
loc.pathname = loc.pathname.replace(lastDirPattern, '/');
}
};
const root = (win: Window): void => {
win.location.href = win.location.origin;
};
export { historyPrev, historyNext, linkPrev, linkNext, parent, root };
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