eslint-plugin-sonarjs
Version:
SonarJS rules for ESLint
66 lines (65 loc) • 2.59 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/S6019/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 => {
return {
onRegExpLiteralEnter: (node) => {
node.pattern.alternatives.forEach(({ elements }) => checkElements(elements, context));
},
};
}, (0, index_js_1.generateMeta)(meta_js_1.meta));
function report(quantifier, context) {
const ending = quantifier.min === 1 ? '' : 's';
const message = `Fix this reluctant quantifier that will only ever match ${quantifier.min} repetition${ending}.`;
context.reportRegExpNode({
message,
regexpNode: quantifier,
node: context.node,
});
}
function checkElements(elements, context) {
if (elements.length === 0) {
return;
}
const lastElement = elements[elements.length - 1];
if (lastElement.type === 'Quantifier' && !lastElement.greedy) {
report(lastElement, context);
return;
}
if (elements.length === 1) {
return;
}
const lastButOneElement = elements[elements.length - 2];
if (lastButOneElement.type === 'Quantifier' && !lastButOneElement.greedy) {
if (lastElement.type === 'Assertion' && lastElement.kind === 'end') {
context.reportRegExpNode({
message: `Remove the '?' from this unnecessarily reluctant quantifier.`,
regexpNode: lastButOneElement,
node: context.node,
});
}
else if (lastElement.type === 'Quantifier' && lastElement.min === 0) {
report(lastButOneElement, context);
}
}
}