unified-query/dist/parsers/utility.js

Composable search input with autocompletion and a rich query-language parser for the Unified Data System

const TODAY_RE = /^(today|yesterday)$/i;
const LAST_RE = /^last(\d+)(days|weeks|months|years)$/i;
export const utilityDateParser = (word, pos) => {
    let op;
    if (word[0] === '<' || word[0] === '>') {
        op = word[0];
        word = word.slice(1);
        pos += 1;
    }
    let m = TODAY_RE.exec(word);
    if (m) {
        const value = { util: m[1].toLowerCase() };
        return { kind: 'dateutil', op, value, raw: word, from: pos, to: pos + word.length };
    }
    m = LAST_RE.exec(word);
    if (m) {
        const value = {
            util: 'last',
            n: +m[1],
            unit: m[2],
        };
        return { kind: 'dateutil', op, value, raw: word, from: pos, to: pos + word.length };
    }
    return null;
};