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expose cobie utilities for browser

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Kiyomichi Kosaka
2025-06-15 00:29:36 +02:00
parent fcb49b2f97
commit 76e9bab8e6
4 changed files with 35 additions and 281 deletions
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clock.js
+8 -59
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@@ -1,66 +1,15 @@
// Minimal CoBiE analog clock logic wrapped in its own scope to
// avoid clashes with variables from other scripts on the page.
(function () {
const COBIE_EPOCH = 0;
const COBIE_UNITS = {
second: 1,
xenocycle: 0x10,
quantic: 0x100,
chronon: 0x1000,
eonstrip: 0x10000,
megasequence: 0x100000,
cosmocycle: 0x1000000,
};
const {
COBIE_EPOCH,
COBIE_UNITS,
floorDiv,
getTAIOffsetAt,
toCobiets
} = window.Cobie;
function floorDiv(a, b) {
return Math.trunc(a / b);
}
function getTAIOffsetAt(date) {
const taiEpoch = new Date('1958-01-01T00:00:00Z');
if (date < taiEpoch) return 0;
const leapSeconds = [
{ date: '1972-01-01T00:00:00Z', offset: 10 },
{ date: '1972-07-01T00:00:00Z', offset: 11 },
{ date: '1973-01-01T00:00:00Z', offset: 12 },
{ date: '1974-01-01T00:00:00Z', offset: 13 },
{ date: '1975-01-01T00:00:00Z', offset: 14 },
{ date: '1976-01-01T00:00:00Z', offset: 15 },
{ date: '1977-01-01T00:00:00Z', offset: 16 },
{ date: '1978-01-01T00:00:00Z', offset: 17 },
{ date: '1979-01-01T00:00:00Z', offset: 18 },
{ date: '1980-01-01T00:00:00Z', offset: 19 },
{ date: '1981-07-01T00:00:00Z', offset: 20 },
{ date: '1982-07-01T00:00:00Z', offset: 21 },
{ date: '1983-07-01T00:00:00Z', offset: 22 },
{ date: '1985-07-01T00:00:00Z', offset: 23 },
{ date: '1988-01-01T00:00:00Z', offset: 24 },
{ date: '1990-01-01T00:00:00Z', offset: 25 },
{ date: '1991-01-01T00:00:00Z', offset: 26 },
{ date: '1992-07-01T00:00:00Z', offset: 27 },
{ date: '1993-07-01T00:00:00Z', offset: 28 },
{ date: '1994-07-01T00:00:00Z', offset: 29 },
{ date: '1996-01-01T00:00:00Z', offset: 30 },
{ date: '1997-07-01T00:00:00Z', offset: 31 },
{ date: '1999-01-01T00:00:00Z', offset: 32 },
{ date: '2006-01-01T00:00:00Z', offset: 33 },
{ date: '2009-01-01T00:00:00Z', offset: 34 },
{ date: '2012-07-01T00:00:00Z', offset: 35 },
{ date: '2015-07-01T00:00:00Z', offset: 36 },
{ date: '2017-01-01T00:00:00Z', offset: 37 },
];
for (let i = 0; i < leapSeconds.length; i++) {
const d = new Date(leapSeconds[i].date);
if (date < d) return i === 0 ? 10 : leapSeconds[i - 1].offset;
}
return 37;
}
function toCobiets(date) {
const utcSec = floorDiv(date.getTime(), 1000);
const taiSec = utcSec + getTAIOffsetAt(date);
return taiSec - COBIE_EPOCH;
}
// CoBiE helpers pulled from cobie.js
function placeMarkers() {
const clock = document.getElementById('clock');