zent/es/mention/findMentionAtCaretPosition.js

一套前端设计语言和基于React的实现

import { isWhiteSpace } from './utils';
import { MENTION_NOT_FOUND, MENTION_FOUND } from './constants';
import findLastIndex from '../utils/findLastIndex';
import findIndex from '../utils/findIndex';
var NOT_FOUND = {
    code: MENTION_NOT_FOUND,
};
export function findMentionAtCaretPosition(_a) {
    var input = _a.input, value = _a.value, triggerText = _a.triggerText;
    var selectionEnd = input.selectionEnd;
    var mentionStartIndex = findLastIndex(value, isWhiteSpace, selectionEnd - 1);
    if (mentionStartIndex + 1 === selectionEnd) {
        return NOT_FOUND;
    }
    var mentionEndIndex = findIndex(value, isWhiteSpace, selectionEnd);
    var i = mentionStartIndex === -1
        ? 0
        : Math.min(mentionStartIndex + 1, value.length - 1);
    var caretMeasureStart = i;
    var end = mentionEndIndex === -1
        ? value.length - 1
        : Math.max(mentionEndIndex - 1, 0);
    var j = 0;
    var triggerEnd = triggerText.length - 1;
    var foundTrigger = true;
    while (j <= triggerEnd) {
        if (i > end || value[i] !== triggerText[j]) {
            foundTrigger = false;
            break;
        }
        i++;
        j++;
    }
    if (!foundTrigger) {
        return NOT_FOUND;
    }
    return {
        code: MENTION_FOUND,
        caretMeasureStart: caretMeasureStart,
        searchStart: i,
        searchEnd: end,
        placeholderStart: caretMeasureStart + triggerText.length,
        placeholderEnd: end,
    };
}