mirror of
https://github.com/status-im/react-native.git
synced 2025-01-17 21:11:45 +00:00
9c8c597000
Reviewed By: adiphos, mantong01 Differential Revision: D7198155 fbshipit-source-id: 360955de7ed686170a23b9883058e3137e17b277
48 lines
1.2 KiB
JavaScript
48 lines
1.2 KiB
JavaScript
/**
|
|
* Copyright (c) 2015-present, Facebook, Inc.
|
|
*
|
|
* This source code is licensed under the MIT license found in the
|
|
* LICENSE file in the root directory of this source tree.
|
|
*
|
|
* @providesModule truncate
|
|
* @flow
|
|
*/
|
|
'use strict';
|
|
|
|
type truncateOptions = {
|
|
breakOnWords: boolean,
|
|
minDelta: number,
|
|
elipsis: string,
|
|
}
|
|
|
|
const defaultOptions = {
|
|
breakOnWords: true,
|
|
minDelta: 10, // Prevents truncating a tiny bit off the end
|
|
elipsis: '...',
|
|
};
|
|
|
|
// maxChars (including ellipsis)
|
|
const truncate = function(
|
|
str: ?string,
|
|
maxChars: number,
|
|
options?: truncateOptions
|
|
): ?string {
|
|
options = Object.assign({}, defaultOptions, options);
|
|
if (str && str.length &&
|
|
str.length - options.minDelta + options.elipsis.length >= maxChars) {
|
|
// If the slice is happening in the middle of a wide char, add one more char
|
|
var extraChar = str.charCodeAt(maxChars - options.elipsis.length) > 255
|
|
? 1
|
|
: 0;
|
|
str = str.slice(0, maxChars - options.elipsis.length + 1 + extraChar);
|
|
if (options.breakOnWords) {
|
|
var ii = Math.max(str.lastIndexOf(' '), str.lastIndexOf('\n'));
|
|
str = str.slice(0, ii);
|
|
}
|
|
str = str.trim() + options.elipsis;
|
|
}
|
|
return str;
|
|
};
|
|
|
|
module.exports = truncate;
|