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paginator.js
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paginator.js
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'use strict';
const { htmlTag, url_for } = require('hexo-util');
const createLink = (options, ctx) => {
const { base, format } = options;
return i => url_for.call(ctx, i === 1 ? base : base + format.replace('%d', i));
};
const createPageTag = (options, ctx) => {
const link = createLink(options, ctx);
const { current, escape, transform } = options;
return i => {
if (i === current) {
return htmlTag('span', { class: 'page-number current' }, transform ? transform(i) : i, escape);
}
return htmlTag('a', { class: 'page-number', href: link(i) }, transform ? transform(i) : i, escape);
};
};
const showAll = (tags, options, ctx) => {
const { total } = options;
const pageLink = createPageTag(options, ctx);
for (let i = 1; i <= total; i++) {
tags.push(pageLink(i));
}
};
// It's too complicated. May need refactor.
const pagenasionPartShow = (tags, options, ctx) => {
const {
current,
total,
space,
end_size: endSize,
mid_size: midSize
} = options;
const leftEnd = current <= endSize ? current - 1 : endSize;
const rightEnd = total - current <= endSize ? current + 1 : total - endSize + 1;
const leftMid = current - midSize <= endSize ? leftEnd + 1 : current - midSize;
const rightMid = current + midSize + endSize > total ? rightEnd - 1 : current + midSize;
const spaceHtml = htmlTag('span', { class: 'space' }, space, false);
const pageTag = createPageTag(options, ctx);
// Display pages on the left edge
for (let i = 1; i <= leftEnd; i++) {
tags.push(pageTag(i));
}
// Display spaces between edges and middle pages
if (space && current - endSize - midSize > 1) {
tags.push(spaceHtml);
}
// Display left middle pages
if (leftMid > leftEnd) {
for (let i = leftMid; i < current; i++) {
tags.push(pageTag(i));
}
}
// Display the current page
tags.push(pageTag(current));
// Display right middle pages
if (rightMid < rightEnd) {
for (let i = current + 1; i <= rightMid; i++) {
tags.push(pageTag(i));
}
}
// Display spaces between edges and middle pages
if (space && total - endSize - midSize > current) {
tags.push(spaceHtml);
}
// Display pages on the right edge
for (let i = rightEnd; i <= total; i++) {
tags.push(pageTag(i));
}
};
function paginatorHelper(options = {}) {
options = Object.assign({
base: this.page.base || '',
current: this.page.current || 0,
format: `${this.config.pagination_dir}/%d/`,
total: this.page.total || 1,
end_size: 1,
mid_size: 2,
space: '…',
next_text: 'Next',
prev_text: 'Prev',
prev_next: true,
escape: true
}, options);
const {
current,
total,
prev_text: prevText,
next_text: nextText,
prev_next: prevNext,
escape
} = options;
if (!current) return '';
const link = createLink(options, this);
const tags = [];
// Display the link to the previous page
if (prevNext && current > 1) {
tags.push(htmlTag('a', { class: 'extend prev', rel: 'prev', href: link(current - 1)}, prevText, escape));
}
if (options.show_all) {
showAll(tags, options, this);
} else {
pagenasionPartShow(tags, options, this);
}
// Display the link to the next page
if (prevNext && current < total) {
tags.push(htmlTag('a', { class: 'extend next', rel: 'next', href: link(current + 1) }, nextText, escape));
}
return tags.join('');
}
module.exports = paginatorHelper;