(function() {
  if (
    (typeof self !== 'undefined' && !self.Prism) ||
    (typeof global !== 'undefined' && !global.Prism)
  ) {
    return;
  }

  var url = /\b([a-z]{3,7}:\/\/|tel:)[\w\-+%~/.:=&]+(?:\?[\w\-+%~/.:#=?&!$'()*,;]*)?(?:#[\w\-+%~/.:#=?&!$'()*,;]*)?/,
    email = /\b\S+@[\w.]+[a-z]{2}/,
    linkMd = /\[([^\]]+)]\(([^)]+)\)/,
    // Tokens that may contain URLs and emails
    candidates = ['comment', 'url', 'attr-value', 'string'];

  Prism.plugins.autolinker = {
    processGrammar: function(grammar) {
      // Abort if grammar has already been processed
      if (!grammar || grammar['url-link']) {
        return;
      }
      Prism.languages.DFS(grammar, function(key, def, type) {
        if (candidates.indexOf(type) > -1 && Prism.util.type(def) !== 'Array') {
          if (!def.pattern) {
            def = this[key] = {
              pattern: def,
            };
          }

          def.inside = def.inside || {};

          if (type == 'comment') {
            def.inside['md-link'] = linkMd;
          }
          if (type == 'attr-value') {
            Prism.languages.insertBefore(
              'inside',
              'punctuation',
              { 'url-link': url },
              def
            );
          } else {
            def.inside['url-link'] = url;
          }

          def.inside['email-link'] = email;
        }
      });
      grammar['url-link'] = url;
      grammar['email-link'] = email;
    },
  };

  Prism.hooks.add('before-highlight', function(env) {
    Prism.plugins.autolinker.processGrammar(env.grammar);
  });

  Prism.hooks.add('wrap', function(env) {
    if (/-link$/.test(env.type)) {
      env.tag = 'a';

      var href = env.content;

      if (env.type == 'email-link' && href.indexOf('mailto:') != 0) {
        href = 'mailto:' + href;
      } else if (env.type == 'md-link') {
        // Markdown
        var match = env.content.match(linkMd);

        href = match[2];
        env.content = match[1];
      }

      env.attributes.href = href;
    }

    // Silently catch any error thrown by decodeURIComponent (#1186)
    try {
      env.content = decodeURIComponent(env.content);
    } catch (e) {}
  });
})();
