react-typeahead-component/utils/get_text_direction.js

Typeahead, written using the React.js library.

'use strict';

var RTLCharactersRegExp = require('./rtl_chars_regexp'),
    NeutralCharactersRegExp = require('./neutral_chars_regexp'),
    startsWithRTL = new RegExp('^(?:' + NeutralCharactersRegExp + ')*(?:' + RTLCharactersRegExp + ')'),
    neutralText = new RegExp('^(?:' + NeutralCharactersRegExp + ')*$');

module.exports = function(text) {
    var dir = 'ltr';

    if (startsWithRTL.test(text)) {
        dir = 'rtl';
    } else if (neutralText.test(text)) {
        dir = null;
    }

    return dir;
};