1 | 'use strict';
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2 | var uncurryThis = require('../internals/function-uncurry-this');
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3 | var toObject = require('../internals/to-object');
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4 |
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5 | var floor = Math.floor;
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6 | var charAt = uncurryThis(''.charAt);
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7 | var replace = uncurryThis(''.replace);
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8 | var stringSlice = uncurryThis(''.slice);
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9 |
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10 | var SUBSTITUTION_SYMBOLS = /\$([$&'`]|\d{1,2}|<[^>]*>)/g;
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11 | var SUBSTITUTION_SYMBOLS_NO_NAMED = /\$([$&'`]|\d{1,2})/g;
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12 |
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13 |
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14 |
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15 | module.exports = function (matched, str, position, captures, namedCaptures, replacement) {
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16 | var tailPos = position + matched.length;
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17 | var m = captures.length;
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18 | var symbols = SUBSTITUTION_SYMBOLS_NO_NAMED;
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19 | if (namedCaptures !== undefined) {
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20 | namedCaptures = toObject(namedCaptures);
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21 | symbols = SUBSTITUTION_SYMBOLS;
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22 | }
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23 | return replace(replacement, symbols, function (match, ch) {
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24 | var capture;
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25 | switch (charAt(ch, 0)) {
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26 | case '$': return '$';
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27 | case '&': return matched;
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28 | case '`': return stringSlice(str, 0, position);
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29 | case "'": return stringSlice(str, tailPos);
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30 | case '<':
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31 | capture = namedCaptures[stringSlice(ch, 1, -1)];
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32 | break;
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33 | default:
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34 | var n = +ch;
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35 | if (n === 0) return match;
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36 | if (n > m) {
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37 | var f = floor(n / 10);
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38 | if (f === 0) return match;
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39 | if (f <= m) return captures[f - 1] === undefined ? charAt(ch, 1) : captures[f - 1] + charAt(ch, 1);
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40 | return match;
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41 | }
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42 | capture = captures[n - 1];
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43 | }
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44 | return capture === undefined ? '' : capture;
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45 | });
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46 | };
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