40 lines
1011 B
JavaScript
40 lines
1011 B
JavaScript
'use strict';
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var $ = require('../internals/export');
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var fromCharCode = String.fromCharCode;
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var hex2 = /^[\da-f]{2}$/i;
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var hex4 = /^[\da-f]{4}$/i;
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// `unescape` method
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// https://tc39.es/ecma262/#sec-unescape-string
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$({ global: true }, {
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unescape: function unescape(string) {
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var str = String(string);
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var result = '';
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var length = str.length;
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var index = 0;
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var chr, slice;
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while (index < length) {
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chr = str.charAt(index++);
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if (chr === '%') {
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if (str.charAt(index) === 'u') {
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slice = str.slice(index + 1, index + 5);
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if (hex4.test(slice)) {
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result += fromCharCode(parseInt(slice, 16));
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index += 5;
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continue;
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}
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} else {
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slice = str.slice(index, index + 2);
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if (hex2.test(slice)) {
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result += fromCharCode(parseInt(slice, 16));
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index += 2;
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continue;
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}
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}
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}
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result += chr;
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} return result;
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}
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});
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