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tidying up time_utils to make it faster and pretokenise better

pull/3624/head
Gordon Williams 2024-10-25 09:36:23 +01:00
parent 385d2799d5
commit 527a3c10b8
1 changed files with 12 additions and 17 deletions
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29
modules/time_utils.js
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@ -13,18 +13,13 @@
// Note that if a field is undefined then its value is zero.
//
const ONE_SECOND = 1000;
const ONE_MINUTE = 60 * ONE_SECOND;
const ONE_HOUR = 60 * ONE_MINUTE;
const ONE_DAY = 24 * ONE_HOUR;
/**
* @param {object} time {d, h, m, s}
* @returns the milliseconds contained in the passed time object
*/
exports.encodeTime = (time) => {
time = safeTime(time);
return time.d * ONE_DAY + time.h * ONE_HOUR + time.m * ONE_MINUTE + time.s * ONE_SECOND;
return time.d * 86400000 + time.h * 3600000 + time.m * 60000 + time.s * 1000;
}
// internal use, set to zero all the undefined fields
@ -38,26 +33,26 @@ function safeTime(time) {
*/
exports.decodeTime = (millis) => {
if (typeof millis !== "number") throw "Only a number can be decoded";
var d = Math.floor(millis / ONE_DAY);
millis -= d * ONE_DAY;
var h = Math.floor(millis / ONE_HOUR);
millis -= h * ONE_HOUR;
var m = Math.floor(millis / ONE_MINUTE);
millis -= m * ONE_MINUTE;
var s = Math.floor(millis / ONE_SECOND);
var d = Math.floor(millis / 86400000);
millis -= d * 86400000;
var h = Math.floor(millis / 3600000);
millis -= h * 3600000;
var m = Math.floor(millis / 60000);
millis -= m * 60000;
var s = Math.floor(millis / 1000);
return { d: d, h: h, m: m, s: s };
}
/**
/**
* @param {object|int} value {h, m} object or milliseconds
* @returns an human-readable time string like "10:25"
* @throws an exception if d != 0 or h > 23 or m > 59
*/
exports.formatTime = (value) => {
var time = safeTime(typeof value === "object" ? value : exports.decodeTime(value));
if (time.d != 0) throw "days not supported here";
if (time.h < 0 || time.h > 23) throw "Invalid value: must be 0 <= h <= 23";
if (time.m < 0 || time.m > 59) throw "Invalid value: must be 0 <= m <= 59";
time.h += time.d*24;
/*if (time.h < 0 || time.h > 23) throw "Invalid value: must be 0 <= h <= 23";
if (time.m < 0 || time.m > 59) throw "Invalid value: must be 0 <= m <= 59";*/
return time.h + ":" + ("0" + time.m).substr(-2);
}