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* @license Apache-2.0
*
* Copyright (c) 2026 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var numGraphemeClusters = require( '@stdlib/string/num-grapheme-clusters' );
var nextGraphemeClusterBreak = require( '@stdlib/string/next-grapheme-cluster-break' );
// MAIN //
/**
* Truncates a string to a specified length in grapheme clusters.
*
* @param {string} str - input string
* @param {NonNegativeInteger} len - output string length (including ending)
* @param {string} ending - custom ending
* @returns {string} truncated string
*
* @example
* var out = truncate( 'beep boop', 7, '...' );
* // returns 'beep...'
*
* @example
* var out = truncate( 'beep boop', 5, '>>>' );
* // returns 'be>>>'
*
* @example
* var out = truncate( 'beep boop', 10, '...' );
* // returns 'beep boop'
*
* @example
* var out = truncate( 'beep boop', 0, '...' );
* // returns ''
*
* @example
* var out = truncate( 'beep boop', 2, '...' );
* // returns '..'
*
* @example
* var out = truncate( '🐺 Wolf Brothers 🐺', 7, '...' );
* // returns '🐺 Wo...'
*/
function truncate( str, len, ending ) {
var endingLength;
var fromIndex;
var nVisual;
var idx;
endingLength = numGraphemeClusters( ending );
fromIndex = 0;
if ( len >= numGraphemeClusters( str ) ) {
return str;
}
if ( len - endingLength <= 0 ) {
// Note: when slicing the ending, we use UTF-16 code units since `slice` operates on them.
// If `ending` contains multi-code-unit graphemes, it will slice in the middle of a grapheme.
// This mimics the original truncate behavior.
return ending.slice( 0, len );
}
nVisual = 0;
while ( nVisual < len - endingLength ) {
idx = nextGraphemeClusterBreak( str, fromIndex );
fromIndex = idx;
nVisual += 1;
}
return str.substring( 0, idx ) + ending;
}
// EXPORTS //
module.exports = truncate;
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