var graphemeSplitter = require("grapheme-splitter")
const splitter = new graphemeSplitter()
var chineseSymbol = ['，', '：', '——', '……'];
var emojiRex = /(\ud83c[\udf00-\udfff])|(\ud83d[\udc00-\ude4f\ude80-\udeff])|[\u2600-\u2B55]/g
function handleStr(title) {
var arr = splitter.splitGraphemes(title);
var firstDashIdx = arr.indexOf('—');
if (
firstDashIdx > -1 &&
arr.length - 1 > firstDashIdx &&
arr[firstDashIdx + 1] === '—'
) {
arr[firstDashIdx] = '——';
arr.splice(firstDashIdx + 1, 1);
}
var firstEllIdx = arr.indexOf('…');
if (
firstEllIdx > -1 &&
arr.length - 1 > firstEllIdx &&
arr[firstEllIdx + 1] === '…'
) {
arr[firstEllIdx] = '……';
arr.splice(firstEllIdx + 1, 1);
}
if (arr.length < 15) return title;
var length = arr.length;
var half = Math.floor(length / 2);
var start = length % 2 === 0 ? half - 1 : half;
var end = half;
var handleLeft = true;
while (start + length - end - 1 > 12) {
if (handleLeft) {
start -= 1;
if (
emojiRex.test(arr[start - 1]) ||
chineseSymbol.indexOf(arr[start - 1]) > -1
) {
start -= 1;
end -= 1;
} else {
handleLeft = false;
}
} else {
end += 1;
if (
emojiRex.test(arr[end + 1]) ||
chineseSymbol.indexOf(arr[end + 1]) > -1
) {
start += 1;
end += 1;
} else {
handleLeft = true;
}
}
}
return arr
.slice(0, start)
.concat('...', arr.slice(end + 1))
.join('');
}
// 👩❤️💋👩 🏳️🌈🚀🌷
console.log(handleStr('🎅🎄🎁❤️🚀🌷圣诞快乐，系列有9了'));
console.log(handleStr('🎅🎄🎁❤️大家圣诞快乐，系列有9了'));
console.log(handleStr('在这里祝大家圣诞快乐系列有9！'));
Created from: https://npm.runkit.com/grapheme-splitter