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

A natural language date parser in Javascript

import { WEEKDAY_DICTIONARY } from "../constants.js";
import { matchAnyPattern } from "../../../utils/pattern.js";
import { AbstractParserWithWordBoundaryChecking } from "../../../common/parsers/AbstractParserWithWordBoundary.js";
import { createParsingComponentsAtWeekday } from "../../../common/calculation/weekdays.js";
import { Weekday } from "../../../types.js";
const PATTERN = new RegExp("(?:(?:\\,|\\(|\\（)\\s*)?" +
    "(?:on\\s*?)?" +
    "(?:(this|last|past|next)\\s*)?" +
    `(${matchAnyPattern(WEEKDAY_DICTIONARY)}|weekend|weekday)` +
    "(?:\\s*(?:\\,|\\)|\\）))?" +
    "(?:\\s*(this|last|past|next)\\s*week)?" +
    "(?=\\W|$)", "i");
const PREFIX_GROUP = 1;
const WEEKDAY_GROUP = 2;
const POSTFIX_GROUP = 3;
export default class ENWeekdayParser extends AbstractParserWithWordBoundaryChecking {
    innerPattern() {
        return PATTERN;
    }
    innerExtract(context, match) {
        const prefix = match[PREFIX_GROUP];
        const postfix = match[POSTFIX_GROUP];
        let modifierWord = prefix || postfix;
        modifierWord = modifierWord || "";
        modifierWord = modifierWord.toLowerCase();
        let modifier = null;
        if (modifierWord == "last" || modifierWord == "past") {
            modifier = "last";
        }
        else if (modifierWord == "next") {
            modifier = "next";
        }
        else if (modifierWord == "this") {
            modifier = "this";
        }
        const weekday_word = match[WEEKDAY_GROUP].toLowerCase();
        let weekday;
        if (WEEKDAY_DICTIONARY[weekday_word] !== undefined) {
            weekday = WEEKDAY_DICTIONARY[weekday_word];
        }
        else if (weekday_word == "weekend") {
            weekday = modifier == "last" ? Weekday.SUNDAY : Weekday.SATURDAY;
        }
        else if (weekday_word == "weekday") {
            const refWeekday = context.reference.getDateWithAdjustedTimezone().getDay();
            if (refWeekday == Weekday.SUNDAY || refWeekday == Weekday.SATURDAY) {
                weekday = modifier == "last" ? Weekday.FRIDAY : Weekday.MONDAY;
            }
            else {
                weekday = refWeekday - 1;
                weekday = modifier == "last" ? weekday - 1 : weekday + 1;
                weekday = (weekday % 5) + 1;
            }
        }
        else {
            return null;
        }
        return createParsingComponentsAtWeekday(context.reference, weekday, modifier);
    }
}
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