liquidex/treehouse
liquidex/treehouse
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Code Issues 39 Activity

add ulid timestamp extraction script

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liquidex 2024-02-06 20:12:37 +01:00
parent 4524623697
commit 8c91bb3d34
2 changed files with 33 additions and 0 deletions
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32
static/js/ulid.js Normal file
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@ -0,0 +1,32 @@
let canonicalBase32 = "0123456789ABCDEFGHJKMNPQRSTVWXYZ";
let canonicalBase32Rev = {};
for (let i = 0; i < canonicalBase32.length; ++i) {
canonicalBase32Rev[canonicalBase32.charAt(i)] = i;
}
// Works on BigInt to support numbers larger than (1 << 31).
function decodeCanonicalBase32(string) {
let result = 0n;
let cursor = 0b1n;
for (let i = string.length - 1; i >= 0; --i) {
result += cursor * BigInt(canonicalBase32Rev[string[i]]);
cursor <<= 5n;
}
return result;
}
export function getTimestamp(ulid) {
return new Date(Number(decodeCanonicalBase32(ulid.substring(0, 10))));
}
export function isCanonicalUlid(id) {
if (id.length != 26) {
return false;
}
for (let i = 0; i < id.length; ++i) {
if (!canonicalBase32.includes(id.charAt(i))) {
return false;
}
}
return true;
}

1
template/tree.hbs
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@ -24,6 +24,7 @@
<script>const TREEHOUSE_SITE = `{{ config.site }}`;</script>
<script type="module" src="{{ config.site }}/navmap.js"></script>
<script type="module" src="{{ config.site }}/static/js/ulid.js"></script>
<script type="module" src="{{ config.site }}/static/js/usability.js"></script>
<script type="module" src="{{ config.site }}/static/js/tree.js"></script>
<script type="module" src="{{ config.site }}/static/js/emoji.js"></script>