mirror of https://github.com/lukechilds/node.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
48 lines
1.9 KiB
48 lines
1.9 KiB
/** Used to compose unicode character classes. */
|
|
var rsAstralRange = '\\ud800-\\udfff',
|
|
rsComboMarksRange = '\\u0300-\\u036f\\ufe20-\\ufe23',
|
|
rsComboSymbolsRange = '\\u20d0-\\u20f0',
|
|
rsVarRange = '\\ufe0e\\ufe0f';
|
|
|
|
/** Used to compose unicode capture groups. */
|
|
var rsAstral = '[' + rsAstralRange + ']',
|
|
rsCombo = '[' + rsComboMarksRange + rsComboSymbolsRange + ']',
|
|
rsFitz = '\\ud83c[\\udffb-\\udfff]',
|
|
rsModifier = '(?:' + rsCombo + '|' + rsFitz + ')',
|
|
rsNonAstral = '[^' + rsAstralRange + ']',
|
|
rsRegional = '(?:\\ud83c[\\udde6-\\uddff]){2}',
|
|
rsSurrPair = '[\\ud800-\\udbff][\\udc00-\\udfff]',
|
|
rsZWJ = '\\u200d';
|
|
|
|
/** Used to compose unicode regexes. */
|
|
var reOptMod = rsModifier + '?',
|
|
rsOptVar = '[' + rsVarRange + ']?',
|
|
rsOptJoin = '(?:' + rsZWJ + '(?:' + [rsNonAstral, rsRegional, rsSurrPair].join('|') + ')' + rsOptVar + reOptMod + ')*',
|
|
rsSeq = rsOptVar + reOptMod + rsOptJoin,
|
|
rsSymbol = '(?:' + [rsNonAstral + rsCombo + '?', rsCombo, rsRegional, rsSurrPair, rsAstral].join('|') + ')';
|
|
|
|
/** Used to match [string symbols](https://mathiasbynens.be/notes/javascript-unicode). */
|
|
var reComplexSymbol = RegExp(rsFitz + '(?=' + rsFitz + ')|' + rsSymbol + rsSeq, 'g');
|
|
|
|
/** Used to detect strings with [zero-width joiners or code points from the astral planes](http://eev.ee/blog/2015/09/12/dark-corners-of-unicode/). */
|
|
var reHasComplexSymbol = RegExp('[' + rsZWJ + rsAstralRange + rsComboMarksRange + rsComboSymbolsRange + rsVarRange + ']');
|
|
|
|
/**
|
|
* Gets the number of symbols in `string`.
|
|
*
|
|
* @private
|
|
* @param {string} string The string to inspect.
|
|
* @returns {number} Returns the string size.
|
|
*/
|
|
function stringSize(string) {
|
|
if (!(string && reHasComplexSymbol.test(string))) {
|
|
return string.length;
|
|
}
|
|
var result = reComplexSymbol.lastIndex = 0;
|
|
while (reComplexSymbol.test(string)) {
|
|
result++;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
module.exports = stringSize;
|
|
|