locutus
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Locutus other languages' standard libraries to JavaScript for fun and educational purposes
69 lines (68 loc) • 2.94 kB
JavaScript
export 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 -> "</p>", 'ENT_NOQUOTES')
// returns 1: '<p>this -> "</p>'
// example 2: htmlspecialchars_decode("&quot;")
// returns 2: '"'
let optTemp = 0;
let noquotes = false;
let quoteStyleValue = quoteStyle;
if (typeof quoteStyleValue === 'undefined') {
quoteStyleValue = 2;
}
let decoded = string.toString().replace(/</g, '<').replace(/>/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(/�*39;/g, "'");
// This would also be useful here, but not a part of PHP:
// string = string.replace(/'|�*27;/g, "'");
}
if (!noquotes) {
decoded = decoded.replace(/"/g, '"');
}
// Put this in last place to avoid escape being double-decoded
decoded = decoded.replace(/&/g, '&');
return decoded;
}