nnk-js/index.mjs

Converts written numbers into their numerical values.

class NoNumbersKeyboard {
    constructor() {
        return new Proxy(this, {
            get: (target, prop) => {
                if (typeof prop === 'string') {
                    return () => this.#parseMethodName(prop);
                }
                return target[prop];
            }
        });
    }

    #parseMethodName(methodName) {
        const wordsToDigits = {
            zero: 0,
            one: 1,
            two: 2,
            three: 3,
            four: 4,
            five: 5,
            six: 6,
            seven: 7,
            eight: 8,
            nine: 9,
            ten: 10,
            eleven: 11,
            twelve: 12,
            thirteen: 13,
            fourteen: 14,
            fifteen: 15,
            sixteen: 16,
            seventeen: 17,
            eighteen: 18,
            nineteen: 19,
            twenty: 20,
            thirty: 30,
            forty: 40,
            fifty: 50,
            sixty: 60,
            seventy: 70,
            eighty: 80,
            ninety: 90,
            hundred: 100,
            thousand: 1000,
            million: 1000000,
        };
        let parts = [];
        let currentWord = '';
        let index = 0;

        while (index < methodName.length) {
            currentWord += methodName[index].toLowerCase();
            if (Object.keys(wordsToDigits).includes(currentWord)) {
                parts.push(currentWord);
                currentWord = '';
            }
            index++;
        }

        if (currentWord !== '') {
            throw new Error(`Invalid method name: '${methodName}'. Failed to parse '${currentWord}'.`);
        }

        if (!parts.length) {
            throw new Error(`Invalid method name: '${methodName}'. No recognizable number words found.`);
        }

        return this.#convertPartsToNumber(parts, wordsToDigits);
    }

    #convertPartsToNumber(parts, wordsToDigits) {
        let total = 0;
        let segment = 0;

        parts.forEach(part => {
            let value = wordsToDigits[part];
            if (value < 100) {
                segment += value;
            } else {
                segment = segment === 0 ? value : segment * value;
                if (part === 'thousand' || part === 'million') {
                    total += segment;
                    segment = 0;
                }
            }
        });

        return total + segment;
    }
}

module.exports = {
    NoNumbersKeyboard: NoNumbersKeyboard,
    Ltn: NoNumbersKeyboard
};