jku-iis-project-mawen/src/helpers.js

export const handleKeyDown = (e) => {
  if(e.keyCode === 13){
    document.getElementById("input_carry").focus();
  }
};


export const afterCommaLen = (number) => {
  let noStrList = number.toString().split(".");
  if (noStrList.length > 1){
    return noStrList[1].length;
  }
  return 0;
};


export function numbersToArrOfArr(numbers) {
  let befComma = Math.max(...numbers).toString().split(".")[0].length;
  let afterComma = Math.max(...numbers.map(x => afterCommaLen(x)));
  let withComma = Math.max(...numbers.map(x => x.toString().indexOf(".")));

  let arrLength;
  if(withComma < 0){ // no comma found
    arrLength = befComma;
  }else{
    arrLength = befComma + afterComma + 1; // add comma and after comma len
  }

  let numbersArr = numbers.map(x => x.toString().split(""));
  for (let numArr of numbersArr){
    let commaIdx = numArr.indexOf(".");

    // without comma, add before
    while(commaIdx===-1 && numArr.length < befComma){
      numArr.unshift("&nbsp;"); // add " " before comma
    }
    // without comma, add after
    while(commaIdx===-1 && numArr.length < arrLength){
      numArr.push("&nbsp;"); // add " " after comma
    }
    // with comma, add before
    while(commaIdx>-1 && commaIdx!==befComma){
      numArr.unshift("&nbsp;"); // add " " before comma
      commaIdx = numArr.indexOf(".");
    }
    // with comma, add after
    while(numArr.length < arrLength){
      numArr.push("&nbsp;"); // add " " after comma
    }
    numArr.unshift("&nbsp;"); // for carry
  }
  return [numbersArr, befComma+1];
  // TODO: assert all have same length and comma at same index?
}