json8-pointer/lib/escape.js

JSON Pointer toolkit for JavaScript

"use strict";

/**
 * Escape a token for use in JSON Pointer
 *
 * @param  {String} token      - array of tokens
 * @param  {String} separator  - separator to use, defaults to /
 * @return {String}            - escaped token
 */
module.exports = function escape(token, separator) {
  const sep =
    typeof separator === "string" && separator.length > 0 ? separator : "/";
  let escaped = "";
  if (typeof token === "number") token = token.toString();
  for (let i = 0, length = token.length; i < length; i++) {
    const l = token.charAt(i);
    if (l === "~") escaped += "~0";
    else if (l === sep) escaped += "~1";
    else escaped += l;
  }
  return escaped;
};