chrono-node/dist/esm/common/refiners/ExtractTimezoneAbbrRefiner.js

A natural language date parser in Javascript

import { toTimezoneOffset } from "../../timezone.js";
const TIMEZONE_NAME_PATTERN = new RegExp("^\\s*,?\\s*\\(?([A-Z]{2,4})\\)?(?=\\W|$)", "i");
export default class ExtractTimezoneAbbrRefiner {
    constructor(timezoneOverrides) {
        this.timezoneOverrides = timezoneOverrides;
    }
    refine(context, results) {
        const timezoneOverrides = context.option.timezones ?? {};
        results.forEach((result) => {
            const suffix = context.text.substring(result.index + result.text.length);
            const match = TIMEZONE_NAME_PATTERN.exec(suffix);
            if (!match) {
                return;
            }
            const timezoneAbbr = match[1].toUpperCase();
            const refDate = result.start.date() ?? result.refDate ?? new Date();
            const tzOverrides = { ...this.timezoneOverrides, ...timezoneOverrides };
            const extractedTimezoneOffset = toTimezoneOffset(timezoneAbbr, refDate, tzOverrides);
            if (extractedTimezoneOffset == null) {
                return;
            }
            context.debug(() => {
                console.log(`Extracting timezone: '${timezoneAbbr}' into: ${extractedTimezoneOffset} for: ${result.start}`);
            });
            const currentTimezoneOffset = result.start.get("timezoneOffset");
            if (currentTimezoneOffset !== null && extractedTimezoneOffset != currentTimezoneOffset) {
                if (result.start.isCertain("timezoneOffset")) {
                    return;
                }
                if (timezoneAbbr != match[1]) {
                    return;
                }
            }
            if (result.start.isOnlyDate()) {
                if (timezoneAbbr != match[1]) {
                    return;
                }
            }
            result.text += match[0];
            if (!result.start.isCertain("timezoneOffset")) {
                result.start.assign("timezoneOffset", extractedTimezoneOffset);
            }
            if (result.end != null && !result.end.isCertain("timezoneOffset")) {
                result.end.assign("timezoneOffset", extractedTimezoneOffset);
            }
        });
        return results;
    }
}
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