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const PREV_LINK_PATTERNS = [
/\bprev\b/i, /\bprevious\b/i, /\bback\b/i,
/</, /\u2039/, /\u2190/, /\xab/, /\u226a/, /<</
];
const NEXT_LINK_PATTERNS = [
/\bnext\b/i,
/>/, /\u203a/, /\u2192/, /\xbb/, /\u226b/, />>/
];
const findLinkByPatterns = (win, patterns) => {
let links = win.document.getElementsByTagName('a');
return Array.prototype.find.call(links, (link) => {
return patterns.some(ptn => ptn.test(link.textContent));
});
};
const historyPrev = (win) => {
win.history.back();
};
const historyNext = (win) => {
win.history.forward();
};
const linkPrev = (win) => {
let link = win.document.querySelector('a[rel=prev]');
if (link) {
return link.click();
}
link = findLinkByPatterns(win, PREV_LINK_PATTERNS);
if (link) {
link.click();
}
};
const linkNext = (win) => {
let link = win.document.querySelector('a[rel=next]');
if (link) {
return link.click();
}
link = findLinkByPatterns(win, NEXT_LINK_PATTERNS);
if (link) {
link.click();
}
};
const parent = (win) => {
let 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, '/');
}
};
export { historyPrev, historyNext, linkPrev, linkNext, parent };
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