eslint-plugin-sonarjs
Version:
SonarJS rules for ESLint
60 lines • 2.22 kB
JavaScript
;
/*
* eslint-plugin-sonarjs
* Copyright (C) 2018 SonarSource SA
* mailto:info AT sonarsource DOT com
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
// https://jira.sonarsource.com/browse/RSPEC-1940
const nodes_1 = require("../utils/nodes");
const MESSAGE = "Use the opposite operator ({{invertedOperator}}) instead.";
const invertedOperators = {
"==": "!=",
"!=": "==",
"===": "!==",
"!==": "===",
">": "<=",
"<": ">=",
">=": "<",
"<=": ">",
};
const rule = {
meta: {
fixable: "code",
type: "suggestion",
},
create(context) {
return { UnaryExpression: (node) => visitUnaryExpression(node, context) };
},
};
function visitUnaryExpression(unaryExpression, context) {
if (unaryExpression.operator === "!" && nodes_1.isBinaryExpression(unaryExpression.argument)) {
const condition = unaryExpression.argument;
const invertedOperator = invertedOperators[condition.operator];
if (invertedOperator) {
const left = context.getSourceCode().getText(condition.left);
const right = context.getSourceCode().getText(condition.right);
context.report({
message: MESSAGE,
data: { invertedOperator },
node: unaryExpression,
fix: fixer => fixer.replaceText(unaryExpression, `${left} ${invertedOperator} ${right}`),
});
}
}
}
module.exports = rule;
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