Function trimAsciiWhitespace

lib/internal/encoding.js:311–331

(label)

// Unfortunately, String.prototype.trim also removes non-ascii whitespace,
// so we have to do this manually
function trimAsciiWhitespace(label) {
  let s = 0;
  let e = label.length;
  while (s < e && (
    label[s] === '\u0009' ||
    label[s] === '\u000a' ||
    label[s] === '\u000c' ||
    label[s] === '\u000d' ||
    label[s] === '\u0020')) {
    s++;
  }
  while (e > s && (
    label[e - 1] === '\u0009' ||
    label[e - 1] === '\u000a' ||
    label[e - 1] === '\u000c' ||
    label[e - 1] === '\u000d' ||
    label[e - 1] === '\u0020')) {
    e--;
  }
  return StringPrototypeSlice(label, s, e);
}

function getEncodingFromLabel(label) {
  const enc = encodings.get(label);