chrono-node/dist/esm/locales/en/parsers/ENRelativeDateFormatParser.js

A natural language date parser in Javascript

import { TIME_UNIT_DICTIONARY } from "../constants.js";
import { ParsingComponents } from "../../../results.js";
import dayjs from "dayjs";
import { AbstractParserWithWordBoundaryChecking } from "../../../common/parsers/AbstractParserWithWordBoundary.js";
import { matchAnyPattern } from "../../../utils/pattern.js";
const PATTERN = new RegExp(`(this|last|past|next|after\\s*this)\\s*(${matchAnyPattern(TIME_UNIT_DICTIONARY)})(?=\\s*)` + "(?=\\W|$)", "i");
const MODIFIER_WORD_GROUP = 1;
const RELATIVE_WORD_GROUP = 2;
export default class ENRelativeDateFormatParser extends AbstractParserWithWordBoundaryChecking {
    innerPattern() {
        return PATTERN;
    }
    innerExtract(context, match) {
        const modifier = match[MODIFIER_WORD_GROUP].toLowerCase();
        const unitWord = match[RELATIVE_WORD_GROUP].toLowerCase();
        const timeunit = TIME_UNIT_DICTIONARY[unitWord];
        if (modifier == "next" || modifier.startsWith("after")) {
            const timeUnits = {};
            timeUnits[timeunit] = 1;
            return ParsingComponents.createRelativeFromReference(context.reference, timeUnits);
        }
        if (modifier == "last" || modifier == "past") {
            const timeUnits = {};
            timeUnits[timeunit] = -1;
            return ParsingComponents.createRelativeFromReference(context.reference, timeUnits);
        }
        const components = context.createParsingComponents();
        let date = dayjs(context.reference.instant);
        if (unitWord.match(/week/i)) {
            date = date.add(-date.get("d"), "d");
            components.imply("day", date.date());
            components.imply("month", date.month() + 1);
            components.imply("year", date.year());
        }
        else if (unitWord.match(/month/i)) {
            date = date.add(-date.date() + 1, "d");
            components.imply("day", date.date());
            components.assign("year", date.year());
            components.assign("month", date.month() + 1);
        }
        else if (unitWord.match(/year/i)) {
            date = date.add(-date.date() + 1, "d");
            date = date.add(-date.month(), "month");
            components.imply("day", date.date());
            components.imply("month", date.month() + 1);
            components.assign("year", date.year());
        }
        return components;
    }
}
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