# all files / lighthouse-core/driver/gatherers/ theme-color.js

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     /**
     * @license
     * Copyright 2016 Google Inc. All rights reserved.
     *
     * Licensed under the Apache License, Version 2.0 (the "License");
     * you may not use this file except in compliance with the License.
     * You may obtain a copy of the License at
     *
     *     http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed under the License is distributed on an "AS IS" BASIS,
     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     * See the License for the specific language governing permissions and
     * limitations under the License.
     */
    'use strict';

    const Gather = require('./gather');

    class ThemeColor extends Gather {

      afterPass(options) {
        const driver = options.driver;

        return driver.querySelector('head meta[name="theme-color"]')
          .then(node => node && node.getAttribute('content'))
          .then(themeColorMeta => {
            this.artifact = themeColorMeta;
          })
          .catch(_ => {
            // The audit should read this as a fail since -1 is not a valid color.
            this.artifact = -1;
          });
      }
    }

    module.exports = ThemeColor;