1/** Used to compose unicode character classes. */
2var rsAstralRange = '\\ud800-\\udfff',
3    rsComboMarksRange = '\\u0300-\\u036f',
4    reComboHalfMarksRange = '\\ufe20-\\ufe2f',
5    rsComboSymbolsRange = '\\u20d0-\\u20ff',
6    rsComboRange = rsComboMarksRange + reComboHalfMarksRange + rsComboSymbolsRange,
7    rsVarRange = '\\ufe0e\\ufe0f';
8
9/** Used to compose unicode capture groups. */
10var rsAstral = '[' + rsAstralRange + ']',
11    rsCombo = '[' + rsComboRange + ']',
12    rsFitz = '\\ud83c[\\udffb-\\udfff]',
13    rsModifier = '(?:' + rsCombo + '|' + rsFitz + ')',
14    rsNonAstral = '[^' + rsAstralRange + ']',
15    rsRegional = '(?:\\ud83c[\\udde6-\\uddff]){2}',
16    rsSurrPair = '[\\ud800-\\udbff][\\udc00-\\udfff]',
17    rsZWJ = '\\u200d';
18
19/** Used to compose unicode regexes. */
20var reOptMod = rsModifier + '?',
21    rsOptVar = '[' + rsVarRange + ']?',
22    rsOptJoin = '(?:' + rsZWJ + '(?:' + [rsNonAstral, rsRegional, rsSurrPair].join('|') + ')' + rsOptVar + reOptMod + ')*',
23    rsSeq = rsOptVar + reOptMod + rsOptJoin,
24    rsSymbol = '(?:' + [rsNonAstral + rsCombo + '?', rsCombo, rsRegional, rsSurrPair, rsAstral].join('|') + ')';
25
26/** Used to match [string symbols](https://mathiasbynens.be/notes/javascript-unicode). */
27var reUnicode = RegExp(rsFitz + '(?=' + rsFitz + ')|' + rsSymbol + rsSeq, 'g');
28
29/**
30 * Gets the size of a Unicode `string`.
31 *
32 * @private
33 * @param {string} string The string inspect.
34 * @returns {number} Returns the string size.
35 */
36function unicodeSize(string) {
37  var result = reUnicode.lastIndex = 0;
38  while (reUnicode.test(string)) {
39    ++result;
40  }
41  return result;
42}
43
44module.exports = unicodeSize;
45