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Refactor tag sorting algorithm

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closes flarum/core#325
This commit is contained in:
Toby Zerner 2015-10-14 17:04:17 +10:30
parent eb49e1d4e8
commit 76eaf8cb2d
1 changed files with 27 additions and 11 deletions
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38
extensions/tags/js/lib/utils/sortTags.js
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@ -3,22 +3,38 @@ export default function sortTags(tags) {
const aPos = a.position();
const bPos = b.position();
// If they're both secondary tags, sort them by their discussions count,
// descending.
if (aPos === null && bPos === null)
return b.discussionsCount() - a.discussionsCount();
// If just one is a secondary tag, then the primary tag should
// come first.
if (bPos === null) return -1;
if (aPos === null) return 1;
// If we've made it this far, we know they're both primary tags. So we'll
// need to see if they have parents.
const aParent = a.parent();
const bParent = b.parent();
if (aPos === null && bPos === null) {
return b.discussionsCount() - a.discussionsCount();
} else if (bPos === null) {
return -1;
} else if (aPos === null) {
return 1;
} else if (aParent === bParent) {
return aPos - bPos;
} else if (aParent) {
// If they both have the same parent, then their positions are local,
// so we can compare them directly.
if (aParent === bParent) return aPos - bPos;
// If they are both child tags, then we will compare the positions of their
// parents.
else if (aParent && bParent)
return aParent.position() - bParent.position();
// If we are comparing a child tag with its parent, then we let the parent
// come first. If we are comparing an unrelated parent/child, then we
// compare both of the parents.
else if (aParent)
return aParent === b ? 1 : aParent.position() - bPos;
} else if (bParent) {
else if (bParent)
return bParent === a ? -1 : aPos - bParent.position();
}
return 0;
});