react-bootstrap-typeahead/types/utils/getMatchBounds.js

React typeahead with Bootstrap styling

import invariant from 'invariant';
import stripDiacritics from './stripDiacritics';
const CASE_INSENSITIVE = 'i';
const COMBINING_MARKS = /[\u0300-\u036F]/;
export function escapeStringRegexp(str) {
    invariant(typeof str === 'string', '`escapeStringRegexp` expected a string.');
    return str.replace(/[|\\{}()[\]^$+*?.]/g, '\\$&').replace(/-/g, '\\x2d');
}
export default function getMatchBounds(subject, str) {
    const search = new RegExp(escapeStringRegexp(stripDiacritics(str)), CASE_INSENSITIVE);
    const matches = search.exec(stripDiacritics(subject));
    if (!matches) {
        return null;
    }
    let start = matches.index;
    let matchLength = matches[0].length;
    if (COMBINING_MARKS.test(subject)) {
        for (let ii = 0; ii <= start; ii++) {
            if (COMBINING_MARKS.test(subject[ii])) {
                start += 1;
            }
        }
        for (let ii = start; ii <= start + matchLength; ii++) {
            if (COMBINING_MARKS.test(subject[ii])) {
                matchLength += 1;
            }
        }
    }
    return {
        end: start + matchLength,
        start,
    };
}