locutus/esm/php/strings/htmlentities.js

Locutus other languages' standard libraries to JavaScript for fun and educational purposes

import { get_html_translation_table as getHtmlTranslationTable } from "../strings/get_html_translation_table.js";
export function htmlentities(string, quoteStyle, charset, doubleEncode) {
    //      discuss at: https://locutus.io/php/htmlentities/
    // parity verified: PHP 8.3
    //     original by: Kevin van Zonneveld (https://kvz.io)
    //      revised by: Kevin van Zonneveld (https://kvz.io)
    //      revised by: Kevin van Zonneveld (https://kvz.io)
    //     improved by: nobbler
    //     improved by: Jack
    //     improved by: Rafał Kukawski (https://blog.kukawski.pl)
    //     improved by: Dj (https://locutus.io/php/htmlentities:425#comment_134018)
    //     bugfixed by: Onno Marsman (https://twitter.com/onnomarsman)
    //     bugfixed by: Brett Zamir (https://brett-zamir.me)
    //        input by: Ratheous
    //          note 1: function is compatible with PHP 5.2 and older
    //       example 1: htmlentities('Kevin & van Zonneveld')
    //       returns 1: 'Kevin & van Zonneveld'
    //       example 2: htmlentities("foo'bar","ENT_QUOTES")
    //       returns 2: 'foo'bar'
    const hashMap = getHtmlTranslationTable('HTML_ENTITIES', quoteStyle);
    const source = string === null ? '' : string + '';
    if (quoteStyle && quoteStyle === 'ENT_QUOTES') {
        hashMap["'"] = ''';
    }
    const shouldDoubleEncode = doubleEncode === null || !!doubleEncode;
    const regex = new RegExp('&(?:#\\d+|#x[\\da-f]+|[a-zA-Z][\\da-z]*);|[' +
        Object.keys(hashMap)
            .join('')
            // replace regexp special chars
            .replace(/([()[\]{}\-.*+?^$|/\\])/g, '\\$1') +
        ']', 'g');
    return source.replace(regex, function (ent) {
        if (ent.length > 1) {
            return shouldDoubleEncode ? hashMap['&'] + ent.substring(1) : ent;
        }
        return hashMap[ent] ?? ent;
    });
}