Function removeChars

lib/internal/data_url.js:330–343

* @param {string} str * @param {boolean} leading * @param {boolean} trailing * @param {(charCode: number) => boolean} predicate * @returns {string}

(str, leading, trailing, predicate)

 * @returns {string}
 */
function removeChars(str, leading, trailing, predicate) {
  let lead = 0;
  let trail = str.length - 1;

  if (leading) {
    while (lead < str.length && predicate(StringPrototypeCharCodeAt(str, lead))) lead++;
  }

  if (trailing) {
    while (trail > 0 && predicate(StringPrototypeCharCodeAt(str, trail))) trail--;
  }

  return lead === 0 && trail === str.length - 1 ? str : StringPrototypeSlice(str, lead, trail + 1);
}

/**
 * @see https://infra.spec.whatwg.org/#isomorphic-decode