| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| /** |
| * truncateText('ALongText', 4) => 'ALon...' |
| * @param {number} limit |
| * @param {string} text |
| * Each Chinese character is equal to two chars |
| */ |
| const truncateText = (text: string, n: number) => { |
| const exp = /[\u4E00-\u9FA5]/ |
| let res = '' |
| let len = text.length |
| const chinese = text.match(new RegExp(exp, 'g')) |
| if (chinese) { |
| len += chinese.length |
| } |
| if (len > n) { |
| let i = 0 |
| let acc = 0 |
| while (true) { |
| const char = text[i] |
| if (exp.test(char)) { |
| acc += 2 |
| } else { |
| acc++ |
| } |
| if (acc > n) break |
| res += char |
| i++ |
| } |
| res += '...' |
| } else { |
| res = text |
| } |
| return res |
| } |
| |
| export default truncateText |
