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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 isString = require( '@stdlib/assert/is-string' ).isPrimitive;
var isNonNegativeInteger = require( '@stdlib/assert/is-nonnegative-integer' ).isPrimitive;
var isPlainObject = require( '@stdlib/assert/is-plain-object' );
var hasOwnProp = require( '@stdlib/assert/has-own-property' );
var contains = require( '@stdlib/array/base/assert/contains' ).factory;
var format = require( '@stdlib/string/format' );
var truncateMiddleCodeUnit = require( '@stdlib/string/base/truncate-middle' );
var truncateMiddleCodePoints = require( '@stdlib/string/base/truncate-middle-code-points' );
var truncateMiddleGraphemeClusters = require( '@stdlib/string/base/truncate-middle-grapheme-clusters' );
// VARIABLES //
var MODES = [ 'grapheme', 'code_point', 'code_unit' ];
var FCNS = {
'grapheme': truncateMiddleGraphemeClusters,
'code_point': truncateMiddleCodePoints,
'code_unit': truncateMiddleCodeUnit
};
var isMode = contains( MODES );
// MAIN //
/**
* Truncates a string in the middle to a specified length.
*
* @param {string} str - input string
* @param {integer} len - output string length (including sequence)
* @param {string} [seq='...'] - custom replacement sequence
* @param {Options} [options] - options
* @param {string} [options.mode="grapheme"] - type of "character" to return (must be either `grapheme`, `code_point`, or `code_unit`)
* @throws {TypeError} first argument must be a string
* @throws {TypeError} second argument must be a nonnegative integer
* @throws {TypeError} third argument must be a string
* @throws {TypeError} options argument must be an object
* @throws {TypeError} must provide valid options
* @returns {string} truncated string
*
* @example
* var str = 'beep boop';
* var out = truncateMiddle( str, 5 );
* // returns 'b...p'
*
* @example
* var str = 'beep boop';
* var out = truncateMiddle( str, 5, '>>>' );
* // returns 'b>>>p'
*
* @example
* var str = 'beep boop';
* var out = truncateMiddle( str, 10 );
* // returns 'beep boop'
*
* @example
* var str = 'beep boop';
* var out = truncateMiddle( str, 0 );
* // returns ''
*
* @example
* var str = 'beep boop';
* var out = truncateMiddle( str, 2 );
* // returns '..'
*
* @example
* var str = '🐺 Wolf Brothers 🐺';
* var out = truncateMiddle( str, 7 );
* // returns '🐺 ... 🐺'
*/
function truncateMiddle( str, len ) {
var options;
var nargs;
var opts;
var seq;
if ( !isString( str ) ) {
throw new TypeError( format( 'invalid argument. First argument must be a string. Value: `%s`.', str ) );
}
if ( !isNonNegativeInteger( len ) ) {
throw new TypeError( format( 'invalid argument. Second argument must be a nonnegative integer. Value: `%s`.', len ) );
}
nargs = arguments.length;
if ( nargs > 2 ) {
if ( isPlainObject( arguments[ 2 ] ) ) {
options = arguments[ 2 ];
} else {
seq = arguments[ 2 ];
if ( !isString( seq ) ) {
throw new TypeError( format( 'invalid argument. Third argument must be a string. Value: `%s`.', seq ) );
}
if ( nargs > 3 ) {
options = arguments[ 3 ];
if ( !isPlainObject( options ) ) {
throw new TypeError( format( 'invalid argument. Options argument must be an object. Value: `%s`.', options ) );
}
}
}
}
seq = seq || '...';
opts = {
'mode': 'grapheme'
};
if ( options ) {
if ( hasOwnProp( options, 'mode' ) ) {
opts.mode = options.mode;
if ( !isMode( opts.mode ) ) {
throw new TypeError( format( 'invalid option. `%s` option must be one of the following: "%s". Value: `%s`.', 'mode', MODES.join( '", "' ), opts.mode ) );
}
}
}
return FCNS[ opts.mode ]( str, len, seq );
}
// EXPORTS //
module.exports = truncateMiddle;
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