function encode(code) {
  return code
    .replace(/%/g, "%25")
    .replace(/</g, "%3C")
    .replace(/>/g, "%3E")
    .replace(/&/g, "%26")
    .replace(/#/g, "%23")
    .replace(/{/g, "%7B")
    .replace(/}/g, "%7D");
}

function addXmlns(code) {
  if (code.indexOf("xmlns") === -1) {
    return code.replace(/<svg/g, '<svg xmlns="http://www.w3.org/2000/svg"');
  } else {
    return code;
  }
}

function normalize(code) {
  return code
    .replace(/'/g, "%22")
    .replace(/"/g, "'")
    .replace(/\s+/g, " ")
    .trim();
}

function transform(code) {
  return `"data:image/svg+xml;charset=utf-8,${normalize(code)}"`;
}

module.exports = {
  encode,
  addXmlns,
  transform
};