33 lines
1 KiB
JavaScript
33 lines
1 KiB
JavaScript
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var punycode = require('punycode');
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var entities = require('./entities.json');
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module.exports = decode;
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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 str.replace(/&(#?[^;\W]+;?)/g, function (_, match) {
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var m;
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if (m = /^#(\d+);?$/.exec(match)) {
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return punycode.ucs2.encode([ parseInt(m[1], 10) ]);
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} else if (m = /^#[Xx]([A-Fa-f0-9]+);?/.exec(match)) {
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return punycode.ucs2.encode([ parseInt(m[1], 16) ]);
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} else {
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// named entity
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var hasSemi = /;$/.test(match);
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var withoutSemi = hasSemi ? match.replace(/;$/, '') : 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 punycode.ucs2.encode([ target ]);
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} else if (typeof target === 'string') {
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return target;
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} else {
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return '&' + match;
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}
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}
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});
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}
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