locutus/php/strings/htmlspecialchars_decode.js

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

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.htmlspecialchars_decode = htmlspecialchars_decode;
function htmlspecialchars_decode(string, quoteStyle) {
    //       discuss at: https://locutus.io/php/htmlspecialchars_decode/
    //  parity verified: PHP 8.3
    //      original by: Mirek Slugen
    //      improved by: Kevin van Zonneveld (https://kvz.io)
    //      bugfixed by: Mateusz "loonquawl" Zalega
    //      bugfixed by: Onno Marsman (https://twitter.com/onnomarsman)
    //      bugfixed by: Brett Zamir (https://brett-zamir.me)
    //      bugfixed by: Brett Zamir (https://brett-zamir.me)
    //         input by: ReverseSyntax
    //         input by: Slawomir Kaniecki
    //         input by: Scott Cariss
    //         input by: Francois
    //         input by: Ratheous
    //         input by: Mailfaker (https://www.weedem.fr/)
    //       revised by: Kevin van Zonneveld (https://kvz.io)
    // reimplemented by: Brett Zamir (https://brett-zamir.me)
    //        example 1: htmlspecialchars_decode("<p>this -&gt; &quot;</p>", 'ENT_NOQUOTES')
    //        returns 1: '<p>this -> &quot;</p>'
    //        example 2: htmlspecialchars_decode("&amp;quot;")
    //        returns 2: '&quot;'
    let optTemp = 0;
    let noquotes = false;
    let quoteStyleValue = quoteStyle;
    if (typeof quoteStyleValue === 'undefined') {
        quoteStyleValue = 2;
    }
    let decoded = string.toString().replace(/&lt;/g, '<').replace(/&gt;/g, '>');
    const OPTS = {
        ENT_NOQUOTES: 0,
        ENT_HTML_QUOTE_SINGLE: 1,
        ENT_HTML_QUOTE_DOUBLE: 2,
        ENT_COMPAT: 2,
        ENT_QUOTES: 3,
        ENT_IGNORE: 4,
    };
    const isOptKey = (value) => Object.hasOwn(OPTS, value);
    if (quoteStyleValue === 0) {
        noquotes = true;
    }
    if (typeof quoteStyleValue !== 'number') {
        // Allow for a single string or an array of string flags
        const quoteStyleFlags = (Array.isArray(quoteStyleValue) ? quoteStyleValue : [quoteStyleValue]).map((flag) => String(flag));
        for (const flag of quoteStyleFlags) {
            // Resolve string input to bitwise e.g. 'PATHINFO_EXTENSION' becomes 4
            if (flag === 'ENT_NOQUOTES') {
                noquotes = true;
            }
            else if (isOptKey(flag) && OPTS[flag]) {
                optTemp |= OPTS[flag];
            }
        }
        quoteStyleValue = optTemp;
    }
    const resolvedQuoteStyle = typeof quoteStyleValue === 'number' ? quoteStyleValue : optTemp;
    if (resolvedQuoteStyle & OPTS.ENT_HTML_QUOTE_SINGLE) {
        // PHP doesn't currently escape if more than one 0, but it should:
        decoded = decoded.replace(/&#0*39;/g, "'");
        // This would also be useful here, but not a part of PHP:
        // string = string.replace(/&apos;|&#x0*27;/g, "'");
    }
    if (!noquotes) {
        decoded = decoded.replace(/&quot;/g, '"');
    }
    // Put this in last place to avoid escape being double-decoded
    decoded = decoded.replace(/&amp;/g, '&');
    return decoded;
}