'use strict';
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var $ = require('../internals/export');
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var uncurryThis = require('../internals/function-uncurry-this');
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var toString = require('../internals/to-string');
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var fromCharCode = String.fromCharCode;
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var charAt = uncurryThis(''.charAt);
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var exec = uncurryThis(/./.exec);
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var stringSlice = uncurryThis(''.slice);
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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 = toString(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, part;
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while (index < length) {
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chr = charAt(str, index++);
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if (chr === '%') {
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if (charAt(str, index) === 'u') {
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part = stringSlice(str, index + 1, index + 5);
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if (exec(hex4, part)) {
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result += fromCharCode(parseInt(part, 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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part = stringSlice(str, index, index + 2);
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if (exec(hex2, part)) {
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result += fromCharCode(parseInt(part, 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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