polygerrit-ui/app/behaviors/gr-url-encoding-behavior/gr-url-encoding-behavior.html

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<script>
(function(window) {
  'use strict';

  window.Gerrit = window.Gerrit || {};

  /** @polymerBehavior Gerrit.URLEncodingBehavior */
  Gerrit.URLEncodingBehavior = {
    /**
     * Pretty-encodes a URL. Double-encodes the string, and then replaces
     *   benevolent characters for legibility.
     *
     * @param {string} url
     * @param {boolean=} replaceSlashes
     * @return {string}
     */
    encodeURL(url, replaceSlashes) {
      // @see Issue 4255 regarding double-encoding.
      let output = encodeURIComponent(encodeURIComponent(url));
      // @see Issue 4577 regarding more readable URLs.
      output = output.replace(/%253A/g, ':');
      output = output.replace(/%2520/g, '+');
      if (replaceSlashes) {
        output = output.replace(/%252F/g, '/');
      }
      return output;
    },

    /**
     * Single decode for URL components. Will decode plus signs ('+') to spaces.
     * Note: because this function decodes once, it is not the inverse of
     * encodeURL.
     *
     * @param {string} url
     * @return {string}
     */
    singleDecodeURL(url) {
      const withoutPlus = url.replace(/\+/g, '%20');
      return decodeURIComponent(withoutPlus);
    },
  };

  // eslint-disable-next-line no-unused-vars
  function defineEmptyMixin() {
    // This is a temporary function.
    // Polymer linter doesn't process correctly the following code:
    // class MyElement extends Polymer.mixinBehaviors([legacyBehaviors], ...) {...}
    // To workaround this issue, the mock mixin is declared in this method.
    // In the following changes, legacy behaviors will be converted to mixins.

    /**
     * @polymer
     * @mixinFunction
     */
    Gerrit.URLEncodingMixin = base =>
      class extends base {
      };
  }
})(window);
</script>