Press n or j to go to the next uncovered block, b, p or k for the previous block.
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* @license Apache-2.0
*
* Copyright (c) 2023 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';
// VARIABLES //
var RE_UTF16_LOW_SURROGATE = /[\uDC00-\uDFFF]/; // TODO: replace with stdlib pkg
var RE_UTF16_HIGH_SURROGATE = /[\uD800-\uDBFF]/; // TODO: replace with stdlib pkg
// MAIN //
/**
* Invokes a function for each Unicode code point in a string.
*
* @param {string} str - input string
* @param {Function} clbk - function to invoke
* @param {*} [thisArg] - execution context
* @returns {string} input string
*
* @example
* function log( value, index ) {
* console.log( '%d: %s', index, value );
* }
*
* forEach( 'Hello', log );
*/
function forEach( str, clbk, thisArg ) {
var len;
var ch1;
var ch2;
var idx;
var ch;
var i;
len = str.length;
// Process the string one Unicode code unit at a time and handle UTF-16 surrogate pairs as a single Unicode code point...
for ( i = 0; i < len; i++ ) {
ch1 = str[ i ];
idx = i;
ch = ch1;
// Check for a UTF-16 surrogate pair...
if ( i < len-1 && RE_UTF16_HIGH_SURROGATE.test( ch1 ) ) {
// Check whether the high surrogate is paired with a low surrogate...
ch2 = str[ i+1 ];
if ( RE_UTF16_LOW_SURROGATE.test( ch2 ) ) {
// We found a surrogate pair:
ch += ch2;
i += 1; // bump the index to process the next code unit
}
}
// Note: `ch` may be a lone surrogate (e.g., a low surrogate without a preceding high surrogate or a high surrogate at the end of the input string).
// Invoke the callback with the code point:
clbk.call( thisArg, ch, idx, str );
}
return str;
}
// EXPORTS //
module.exports = forEach;
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