no-mixed-operators.js

/**
 * Copyright 2018 The AMP HTML Authors. 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';

module.exports = {
  meta: {
    fixable: 'code',
  },

  create(context) {
    const oror = 'LogicalExpression[operator="||"]';
    const andand = 'LogicalExpression[operator="&&"]';

    return {
      [`${oror} > ${andand}`](node) {
        const sourceCode = context.getSourceCode();
        const before = sourceCode.getTokenBefore(node);
        const after = sourceCode.getTokenAfter(node);
        if (before && before.value === '(' && after && after.value === ')') {
          return;
        }

        context.report({
          node,
          message:
            'Detected mixed use of "&&" with "||" without' +
            ' parenthesizing "(a && b)".',
          fix(fixer) {
            return [
              fixer.insertTextAfter(node, ')'),
              fixer.insertTextBefore(node, '('),
            ];
          },
        });
      },
    };
  },
};