# all files / lighthouse-core/driver/gatherers/ accessibility.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';

    /* global document, __returnResults */

    const Gather = require('./gather');
    const fs = require('fs');
    const axe = fs.readFileSync(
      require.resolve('axe-core/axe.min.js')
    );

    // This is run in the page, not Lighthouse itself.
    /* istanbul ignore next */
    function runA11yChecks() {
      axe.a11yCheck(document, function(results) {
        // __returnResults is magically inserted by driver.evaluateAsync
        __returnResults(results);
      });
    }

    class Accessibility extends Gather {
      static _errorAccessibility(errorString) {
        return {
          raw: undefined,
          value: undefined,
          debugString: errorString
        };
      }

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

        return driver
            .evaluateAsync(`${axe};(${runA11yChecks.toString()}())`)
            .then(returnedValue => {
              if (!returnedValue) {
                this.artifact = Accessibility._errorAccessibility('Unable to parse axe results');
                return;
              }

              if (returnedValue.error) {
                this.artifact = Accessibility._errorAccessibility(returnedValue.error);
              } else {
                this.artifact = returnedValue;
              }
            }, _ => {
              this.artifact = Accessibility._errorAccessibility('Axe results timed out');
            });
      }
    }

    module.exports = Accessibility;