mirror of
https://github.com/musix-org/musix-oss
synced 2025-10-31 21:01:36 +00:00
105 lines
2.7 KiB
Markdown
105 lines
2.7 KiB
Markdown
# ISO8601-duration
|
|
Node/Js-module for parsing and making sense of ISO8601-durations
|
|
|
|
[][1]
|
|
[][2]
|
|
[][3]
|
|
|
|
## The ISO8601 duration format
|
|
|
|
Durations in ISO8601 comes in two formats:
|
|
* **`PnYnMnDTnHnMnS`** - `P<date>T<time>`
|
|
The `n` is replaced by the value for each of the date and time elements that follow the `n`.
|
|
Leading zeros are not required
|
|
* **`PnW`** - the week format
|
|
|
|
|
|
Check out the details on [Wikipedia](https://en.wikipedia.org/wiki/ISO_8601#Durations)
|
|
|
|
## Install
|
|
|
|
```
|
|
$ npm install iso8601-duration
|
|
```
|
|
|
|
## Usage
|
|
Most noteworthy of the interface is the ability to provide a `date` for `toSeconds`-calculations.
|
|
Why becomes evident when working with durations that span dates as all months are not equally long.
|
|
E.g January of 2016 is **744 hours** compared to the **696 hours** of February 2016.
|
|
|
|
If a date is not provided for `toSeconds` the timestamp `Date.now()` is used as baseline.
|
|
|
|
### Interface
|
|
|
|
```js
|
|
export const toSeconds; // fn = (obj, date?) => number
|
|
export const pattern; // ISO8601 RegExp
|
|
export const parse; // fn = string => obj
|
|
export default {
|
|
toSeconds,
|
|
pattern,
|
|
parse
|
|
}
|
|
```
|
|
|
|
### Example
|
|
Simple usage
|
|
```js
|
|
import {parse, end, toSeconds, pattern} from 'iso8601-duration';
|
|
|
|
console.log(parse('P1Y2M4DT20H44M12.67S'));
|
|
/* outputs =>
|
|
{
|
|
years: 1,
|
|
months: 2,
|
|
days: 4,
|
|
hours: 20,
|
|
minutes: 44,
|
|
seconds: 12.67
|
|
}
|
|
*/
|
|
|
|
console.log( toSeconds( parse('PT1H30M10.5S') ) );
|
|
// outputs => 5410.5
|
|
|
|
console.log ( end( parse('P1D') ) );
|
|
// outputs => DateObj 2017-10-04T10:14:50.190Z
|
|
|
|
```
|
|
|
|
A more complete usecase / example
|
|
```js
|
|
import {parse, toSeconds, pattern} from 'iso8601-duration';
|
|
|
|
// convert iso8601 duration-strings to total seconds from some api
|
|
const getWithSensibleDurations = someApiEndpoint => {
|
|
// return promise, like fetch does
|
|
return new Promise(resolve => {
|
|
// fetch text
|
|
fetch(someApiEndpoint)
|
|
.then(res => res.text())
|
|
.then(jsonString => {
|
|
|
|
// create new pattern that matches on surrounding double-quotes
|
|
// so we can replace the string with an actual number
|
|
const replacePattern = new RegExp(`\\"${pattern.source}\\"`, 'g');
|
|
jsonString = jsonString.replace(replacePattern, m => {
|
|
return toSeconds(parse(m));
|
|
});
|
|
// resolve original request with sensible durations in object
|
|
resolve( JSON.parse(jsonString) );
|
|
});
|
|
});
|
|
}
|
|
|
|
```
|
|
|
|
|
|
## License
|
|
|
|
MIT @ https://tolu.mit-license.org/
|
|
|
|
[1]: https://github.com/sindresorhus/xo "xo on github"
|
|
[2]: https://travis-ci.org/tolu/ISO8601-duration "travis build status"
|
|
[3]: https://www.npmjs.com/package/iso8601-duration "npm package"
|