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