Function toASCIILower

lib/internal/mime.js:25–37

(str)

const START_ENDING_WHITESPACE = /[\r\n\t ]*$/;

function toASCIILower(str) {
  // eslint-disable-next-line no-control-regex
  if (!/[^\x00-\x7f]/.test(str)) return StringPrototypeToLowerCase(str);
  let result = '';
  for (let i = 0; i < str.length; i++) {
    const char = str[i];

    result += char >= 'A' && char <= 'Z' ?
      StringPrototypeToLowerCase(char) :
      char;
  }
  return result;
}

const SOLIDUS = '/';
const SEMICOLON = ';';