ee3cd3faab
- fallback links: - select the last matching link rather than the first - use `innerText` rather than `textContent` - use a single regex for each pattern rather than an array - fix markup typo in test
78 lines
1.9 KiB
JavaScript
78 lines
1.9 KiB
JavaScript
const REL_PATTERN = {
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prev: /^(?:prev(?:ious)?|older)\b|\u2039|\u2190|\xab|\u226a|<</i,
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next: /^(?:next|newer)\b|\u203a|\u2192|\xbb|\u226b|>>/i,
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};
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// Return the last element in the document matching the supplied selector
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// and the optional filter, or null if there are no matches.
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const selectLast = (win, selector, filter) => {
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let nodes = win.document.querySelectorAll(selector);
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if (filter) {
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nodes = Array.from(nodes).filter(filter);
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}
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return nodes.length ? nodes[nodes.length - 1] : null;
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};
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const historyPrev = (win) => {
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win.history.back();
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};
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const historyNext = (win) => {
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win.history.forward();
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};
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// Code common to linkPrev and linkNext which navigates to the specified page.
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const linkRel = (win, rel) => {
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let link = selectLast(win, `link[rel~=${rel}][href]`);
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if (link) {
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win.location = link.href;
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return;
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}
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const pattern = REL_PATTERN[rel];
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link = selectLast(win, `a[rel~=${rel}][href]`) ||
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// `innerText` is much slower than `textContent`, but produces much better
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// (i.e. less unexpected) results
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selectLast(win, 'a[href]', lnk => pattern.test(lnk.innerText));
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if (link) {
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link.click();
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}
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};
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const linkPrev = (win) => {
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linkRel(win, 'prev');
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};
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const linkNext = (win) => {
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linkRel(win, 'next');
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};
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const parent = (win) => {
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const loc = win.location;
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if (loc.hash !== '') {
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loc.hash = '';
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return;
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} else if (loc.search !== '') {
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loc.search = '';
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return;
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}
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const basenamePattern = /\/[^/]+$/;
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const lastDirPattern = /\/[^/]+\/$/;
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if (basenamePattern.test(loc.pathname)) {
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loc.pathname = loc.pathname.replace(basenamePattern, '/');
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} else if (lastDirPattern.test(loc.pathname)) {
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loc.pathname = loc.pathname.replace(lastDirPattern, '/');
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}
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};
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const root = (win) => {
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win.location = win.location.origin;
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};
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export { historyPrev, historyNext, linkPrev, linkNext, parent, root };
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