eslint-plugin-sonarjs
Version:
SonarJS rules for ESLint
89 lines (88 loc) • 3.67 kB
JavaScript
;
/*
* SonarQube JavaScript Plugin
* Copyright (C) 2011-2025 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 Sonar Source-Available License Version 1, as published by SonarSource SA.
*
* 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 Sonar Source-Available License for more details.
*
* You should have received a copy of the Sonar Source-Available License
* along with this program; if not, see https://sonarsource.com/license/ssal/
*/
// https://sonarsource.github.io/rspec/#/rspec/S2757
Object.defineProperty(exports, "__esModule", { value: true });
exports.rule = void 0;
const index_js_1 = require("../helpers/index.js");
const meta_js_1 = require("./meta.js");
exports.rule = {
meta: (0, index_js_1.generateMeta)(meta_js_1.meta, {
messages: {
useExistingOperator: 'Was "{{operator}}=" meant instead?',
suggestExistingOperator: 'Replace with "{{operator}}" operator',
},
hasSuggestions: true,
}),
create(context) {
return {
AssignmentExpression(assignmentExpression) {
if (assignmentExpression.operator === '=') {
checkOperator(context, assignmentExpression.right);
}
},
VariableDeclarator(variableDeclarator) {
checkOperator(context, variableDeclarator.init);
},
};
},
};
function checkOperator(context, unaryNode) {
if (unaryNode &&
unaryNode.type === 'UnaryExpression' &&
isUnaryOperatorOfInterest(unaryNode.operator)) {
const { sourceCode } = context;
const assignmentOperatorToken = sourceCode.getTokenBefore(unaryNode, token => token.value === '=');
const unaryOperatorToken = sourceCode.getFirstToken(unaryNode);
const expressionFirstToken = sourceCode.getFirstToken(unaryNode.argument);
if (assignmentOperatorToken != null &&
unaryOperatorToken != null &&
expressionFirstToken != null &&
areAdjacent(assignmentOperatorToken, unaryOperatorToken) &&
!areAdjacent(unaryOperatorToken, expressionFirstToken)) {
const suggest = [];
if (unaryNode.parent?.type === 'AssignmentExpression') {
const range = [
assignmentOperatorToken.range[0],
unaryOperatorToken.range[1],
];
const invertedOperators = unaryOperatorToken.value + assignmentOperatorToken.value;
suggest.push({
messageId: 'suggestExistingOperator',
data: {
operator: invertedOperators,
},
fix: fixer => fixer.replaceTextRange(range, invertedOperators),
});
}
context.report({
messageId: 'useExistingOperator',
data: {
operator: unaryNode.operator,
},
loc: { start: assignmentOperatorToken.loc.start, end: unaryOperatorToken.loc.end },
suggest,
});
}
}
}
function isUnaryOperatorOfInterest(operator) {
return operator === '-' || operator === '+' || operator === '!';
}
function areAdjacent(first, second) {
return (first.loc.end.column === second.loc.start.column && first.loc.end.line === second.loc.start.line);
}