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25 lines
1.0 KiB
25 lines
1.0 KiB
'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 padStart = require('../internals/string-pad').start;
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var WHITESPACES = require('../internals/whitespaces');
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var charCodeAt = uncurryThis(''.charCodeAt);
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var replace = uncurryThis(''.replace);
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var numberToString = uncurryThis(1.1.toString);
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var NEED_ESCAPING = RegExp('[!"#$%&\'()*+,\\-./:;<=>?@[\\\\\\]^`{|}~' + WHITESPACES + ']', 'g');
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// `RegExp.escape` method
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// https://github.com/tc39/proposal-regex-escaping
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$({ target: 'RegExp', stat: true, forced: true }, {
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escape: function escape(S) {
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var str = toString(S);
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var firstCode = charCodeAt(str, 0);
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// escape first DecimalDigit
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return (firstCode > 47 && firstCode < 58 ? '\\x3' : '') + replace(str, NEED_ESCAPING, function (match) {
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var hex = numberToString(charCodeAt(match, 0), 16);
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return hex.length < 3 ? '\\x' + padStart(hex, 2, '0') : '\\u' + padStart(hex, 4, '0');
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});
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}
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});
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