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// @flow
import { MENTIONS } from './regexps';
export const getMentions = (text: string): Array<string> => {
const matchedMentions = text.match(MENTIONS);
const mentions = matchedMentions
? matchedMentions.filter(mention => !mention.startsWith('/'))
: [];
if (!mentions || mentions.length === 0) return [];
// " @Mxstbr" => "@Mxstbr"
const trimmed = mentions.map(
mention => (typeof mention === 'string' ? mention.trim() : mention)
);
// "@Mxstbr" => "Mxstbr"
const cleaned = removeAtSymbol(trimmed);
// "Mxstbr" => "mxstbr"
const lowercase = makeLowercase(cleaned);
// ["mxstbr", "mxstbr"] => ["mxstbr"]
const distinct = getDistinctMentions(lowercase);
return distinct;
};
const makeLowercase = (usernames: Array<string>): Array<string> => {
return usernames.map(u => u.toLowerCase());
};
const removeAtSymbol = (usernames: Array<string>): Array<string> => {
return usernames.map(u => u.substr(1));
};
export const getDistinctMentions = (
usernames: Array<string>
): Array<string> => {
return usernames.filter((v, i, a) => a.indexOf(v) === i);
};
export default getMentions;
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