chrono-node/src/common/refiners/UnlikelyFormatFilter.ts

A natural language date parser in Javascript

import { Filter } from "../abstractRefiners";
import { ParsingResult } from "../../results";

export default class UnlikelyFormatFilter extends Filter {
    constructor(private strictMode: boolean) {
        super();
    }

    isValid(context, result: ParsingResult): boolean {
        if (result.text.replace(" ", "").match(/^\d*(\.\d*)?$/)) {
            context.debug(() => {
                console.log(`Removing unlikely result '${result.text}'`);
            });

            return false;
        }

        if (!result.start.isValidDate()) {
            context.debug(() => {
                console.log(`Removing invalid result: ${result} (${result.start})`);
            });

            return false;
        }

        if (result.end && !result.end.isValidDate()) {
            context.debug(() => {
                console.log(`Removing invalid result: ${result} (${result.end})`);
            });

            return false;
        }

        if (this.strictMode) {
            return this.isStrictModeValid(context, result);
        }

        return true;
    }

    private isStrictModeValid(context, result: ParsingResult) {
        if (result.start.isOnlyWeekdayComponent()) {
            context.debug(() => {
                console.log(`(Strict) Removing weekday only component: ${result} (${result.end})`);
            });

            return false;
        }

        return true;
    }
}