# all files / lighthouse-core/formatters/ 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';

    const path = require('path');
    const fs = require('fs');
    const Formatter = require('./formatter');
    const html = fs.readFileSync(path.join(__dirname, 'partials/accessibility.html'), 'utf8');

    class Accessibilty extends Formatter {
      static getFormatter(type) {
        switch (type) {
          case 'pretty':
            return function(info) {
              if (info === null ||
                  typeof info === 'undefined' ||
                  typeof info.impact === 'undefined' ||
                  typeof info.helpUrl === 'undefined' ||
                  typeof info.nodes === 'undefined' ||
                  !Array.isArray(info.nodes)) {
                return '';
              }

              const output = `      - Rating: ${info.impact}\n` +
              `      - See: ${info.helpUrl}\n` +
              `      - Nodes: ${info.nodes.length} nodes identified (see HTML output for details)\n`;
              return output;
            };

          case 'html':
            // Returns a handlebars string to be used by the Report.
            return html;

          default:
            throw new Error('Unknown formatter type');
        }
      }
    }

    module.exports = Accessibilty;