892a62f4e5
To be followed by tests and `npm run build`, obviously! Reviewed-on: #1 Co-authored-by: Jack Jackson <scubbojj@gmail.com> Co-committed-by: Jack Jackson <scubbojj@gmail.com>
59 lines
1.6 KiB
JavaScript
59 lines
1.6 KiB
JavaScript
/**
|
|
* @fileoverview Utilities to operate on strings.
|
|
* @author Stephen Wade
|
|
*/
|
|
|
|
"use strict";
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Helpers
|
|
//------------------------------------------------------------------------------
|
|
|
|
// eslint-disable-next-line no-control-regex -- intentionally including control characters
|
|
const ASCII_REGEX = /^[\u0000-\u007f]*$/u;
|
|
|
|
/** @type {Intl.Segmenter | undefined} */
|
|
let segmenter;
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Public Interface
|
|
//------------------------------------------------------------------------------
|
|
|
|
/**
|
|
* Converts the first letter of a string to uppercase.
|
|
* @param {string} string The string to operate on
|
|
* @returns {string} The converted string
|
|
*/
|
|
function upperCaseFirst(string) {
|
|
if (string.length <= 1) {
|
|
return string.toUpperCase();
|
|
}
|
|
return string[0].toUpperCase() + string.slice(1);
|
|
}
|
|
|
|
/**
|
|
* Counts graphemes in a given string.
|
|
* @param {string} value A string to count graphemes.
|
|
* @returns {number} The number of graphemes in `value`.
|
|
*/
|
|
function getGraphemeCount(value) {
|
|
if (ASCII_REGEX.test(value)) {
|
|
return value.length;
|
|
}
|
|
|
|
segmenter ??= new Intl.Segmenter("en-US"); // en-US locale should be supported everywhere
|
|
let graphemeCount = 0;
|
|
|
|
// eslint-disable-next-line no-unused-vars -- for-of needs a variable
|
|
for (const unused of segmenter.segment(value)) {
|
|
graphemeCount++;
|
|
}
|
|
|
|
return graphemeCount;
|
|
}
|
|
|
|
module.exports = {
|
|
upperCaseFirst,
|
|
getGraphemeCount
|
|
};
|