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'use strict';
var punycode = require('punycode/');
var $encode = punycode.ucs2.encode;
var regexTest = require('safe-regex-test');
var callBound = require('call-bound');
var $TypeError = require('es-errors/type');
var entities = require('./entities.json');
var endsInSemicolon = regexTest(/;$/);
var $replace = callBound('String.prototype.replace');
var $exec = callBound('RegExp.prototype.exec');
var $parseInt = parseInt;
module.exports = function decode(str) {
if (typeof str !== 'string') {
throw new $TypeError('Expected a String');
}
return $replace(str, /&(#?[^;\W]+;?)/g, function (_, match) {
var m = $exec(/^#(\d+);?$/, match);
if (m) {
return $encode([$parseInt(m[1], 10)]);
}
var m2 = $exec(/^#[Xx]([A-Fa-f0-9]+);?/, match);
if (m2) {
return $encode([$parseInt(m2[1], 16)]);
}
// named entity
var hasSemi = endsInSemicolon(match);
var withoutSemi = hasSemi ? $replace(match, /;$/, '') : match;
var target = entities[withoutSemi] || (hasSemi && entities[match]);
if (typeof target === 'number') {
return $encode([target]);
} else if (typeof target === 'string') {
return target;
}
return '&' + match;
});
};