export class NumberValidators {

    static integer(maxDigits: number = 22){

        return this.decimal(22, 0);
    }

    static decimal(maxDigits: number = 22, maxDecimals: number = 22){

        return (control: AbstractControl): ValidationErrors | null => {

            let value:string = control.value;

            if(isEmpty(value)) return null;

            let matches = String(value).match(FLOAT_REGEX);

            if(matches === null) return {'float': true};

            if(matches[2] !== undefined) {

                if((matches[1].length + matches[2].length) > maxDigits) return
                {'float': true};

                if(matches[2].length > maxDecimals) return {'float': true};

            } else {

                if((matches[1].length) > maxDigits) return {'float': true};

            }

            return null;
        };
    }
}

rowIndexControl = new FormControl('', [NumberValidators.integer()]);
positionIndexControl = new FormControl('', [NumberValidators.integer()]);
rowDistanceControl = new FormControl('', [NumberValidators.integer()]);
colDistanceControl = new FormControl('', [NumberValidators.integer()]);

Validators.pattern(/^[0-9]+$/)