// Should be the same as `DIGIT_PLACEHOLDER` in `libphonenumber-metadata-generator`.
export const DIGIT_PLACEHOLDER = 'x'; // '\u2008' (punctuation space)
const DIGIT_PLACEHOLDER_MATCHER = new RegExp(DIGIT_PLACEHOLDER);

// Counts all occurences of a symbol in a string.
// Unicode-unsafe (because using `.split()`).
export function countOccurences(symbol, string) {
  let count = 0;
  // Using `.split('')` to iterate through a string here
  // to avoid requiring `Symbol.iterator` polyfill.
  // `.split('')` is generally not safe for Unicode,
  // but in this particular case for counting brackets it is safe.
  // for (const character of string)
  for (const character of string.split('')) {
    if (character === symbol) {
      count++;
    }
  }
  return count;
}

// Repeats a string (or a symbol) N times.
// http://stackoverflow.com/questions/202605/repeat-string-javascript
export function repeat(string, times) {
  if (times < 1) {
    return '';
  }
  let result = '';
  while (times > 1) {
    if (times & 1) {
      result += string;
    }
    times >>= 1;
    string += string;
  }
  return result + string;
}
export function cutAndStripNonPairedParens(string, cutBeforeIndex) {
  if (string[cutBeforeIndex] === ')') {
    cutBeforeIndex++;
  }
  return stripNonPairedParens(string.slice(0, cutBeforeIndex));
}
export function closeNonPairedParens(template, cut_before) {
  const retained_template = template.slice(0, cut_before);
  const opening_braces = countOccurences('(', retained_template);
  const closing_braces = countOccurences(')', retained_template);
  let dangling_braces = opening_braces - closing_braces;
  while (dangling_braces > 0 && cut_before < template.length) {
    if (template[cut_before] === ')') {
      dangling_braces--;
    }
    cut_before++;
  }
  return template.slice(0, cut_before);
}
export function stripNonPairedParens(string) {
  const dangling_braces = [];
  let i = 0;
  while (i < string.length) {
    if (string[i] === '(') {
      dangling_braces.push(i);
    } else if (string[i] === ')') {
      dangling_braces.pop();
    }
    i++;
  }
  let start = 0;
  let cleared_string = '';
  dangling_braces.push(string.length);
  for (const index of dangling_braces) {
    cleared_string += string.slice(start, index);
    start = index + 1;
  }
  return cleared_string;
}
export function populateTemplateWithDigits(template, position, digits) {
  // Using `.split('')` to iterate through a string here
  // to avoid requiring `Symbol.iterator` polyfill.
  // `.split('')` is generally not safe for Unicode,
  // but in this particular case for `digits` it is safe.
  // for (const digit of digits)
  for (const digit of digits.split('')) {
    // If there is room for more digits in current `template`,
    // then set the next digit in the `template`,
    // and return the formatted digits so far.
    // If more digits are entered than the current format could handle.
    if (template.slice(position + 1).search(DIGIT_PLACEHOLDER_MATCHER) < 0) {
      return;
    }
    position = template.search(DIGIT_PLACEHOLDER_MATCHER);
    template = template.replace(DIGIT_PLACEHOLDER_MATCHER, digit);
  }
  return [template, position];
}
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