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* @license Apache-2.0
*
* Copyright (c) 2024 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' );
var format = require( '@stdlib/string/format' );
var isWellFormed = require( '@stdlib/assert/is-well-formed-string' );
// VARIABLES //
var RE_UTF16_LOW_SURROGATE = /[\uDC00-\uDFFF]/;
var RE_UTF16_HIGH_SURROGATE = /[\uD800-\uDBFF]/;
// MAIN //
/**
* Replaces all lone surrogates in order to create a new string which is well formed.
*
* @param {string} str - string to convert
* @throws {TypeError} must provide a string
* @returns {string} new string which does not contain any lone surrogates
*
* @example
* var str = str2wellformed( 'ab\uD800' );
* // returns 'ab�'
*/
function str2wellformed( str ) {
var modifiedString;
var i;
modifiedString = '';
if ( !isString( str ) ) {
throw new TypeError( format( 'invalid argument. Must provide a string. Value: `%s`.', str ) );
}
if ( isWellFormed( str ) ) {
for ( i = 0; i < str.length; i++ ) {
modifiedString += str[i];
}
return modifiedString;
}
for ( i = 0; i < str.length; i++ ) {
if ( RE_UTF16_HIGH_SURROGATE.test( str[ i ] ) ) {
// Check whether the high surrogate is paired with a low surrogate...
if ( i < str.length-1 && RE_UTF16_LOW_SURROGATE.test( str[ i+1 ] ) ) {
// We found a surrogate pair:
modifiedString += str[ i ] + str[ i+1 ];
i += 1;
}
else {
modifiedString += '\uFFFD';
}
}
else if ( RE_UTF16_LOW_SURROGATE.test( str[ i ] ) ) {
modifiedString += '\uFFFD';
}
else {
modifiedString += str[ i ];
}
}
return modifiedString;
}
// EXPORTS //
module.exports = str2wellformed;
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