eslint-plugin-sonarjs
Version:
SonarJS rules for ESLint
54 lines (53 loc) • 2.2 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/S6323/javascript
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");
const rule_template_js_1 = require("../helpers/regex/rule-template.js");
exports.rule = (0, rule_template_js_1.createRegExpRule)(context => {
function checkAlternation(alternation) {
const { alternatives: alts } = alternation;
if (alts.length <= 1) {
return;
}
for (let i = 0; i < alts.length; i++) {
const alt = alts[i];
if (alt.elements.length === 0 && !isLastEmptyInGroup(alt)) {
context.reportRegExpNode({
message: 'Remove this empty alternative.',
regexpNode: alt,
offset: i === alts.length - 1 ? [-1, 0] : [0, 1], // we want to raise the issue on the |
node: context.node,
});
}
}
}
return {
onPatternEnter: checkAlternation,
onGroupEnter: checkAlternation,
onCapturingGroupEnter: checkAlternation,
};
}, (0, index_js_1.generateMeta)(meta_js_1.meta));
function isLastEmptyInGroup(alt) {
const group = alt.parent;
return ((group.type === 'Group' || group.type === 'CapturingGroup') &&
(0, index_js_1.last)(group.alternatives) === alt &&
group.parent.type !== 'Quantifier');
}