datetimes/src/expressions/Expression.js

Extend class of Date

function Expresion(dateRx, date, language) {
    this.dateRx = dateRx;
    this.date = date;
    this.language = languages[language];

    //methods
    this.interpret = interpret;
    this.oneDigit = null;
    this.twoDigit = null;
    this.threeDigit = null;
    this.fourDigit = null;
    this.otherDigit = null;

    //implementation
    function interpret(context) {
        if (!context.input.length) {
            return;
        }

        var sourceLength = this.dateRx.source.replace('\\b', '').length;
        
        switch (sourceLength) {
            case 1:
                if (this.oneDigit) context.input = this.oneDigit(context.input);
                break;

            case 2:
                if (this.twoDigit) context.input = this.twoDigit(context.input);
                break;

            case 3:
                if (this.threeDigit) context.input = this.threeDigit(context.input);
                break;

            case 4:
                if (this.fourDigit) context.input = this.fourDigit(context.input);
                break;
            
            default:
                if (this.otherDigit) context.input = this.otherDigit(context.input);
                break;
        }

        context.output = context.input;
    }
}