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generator-without-yield.ts
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generator-without-yield.ts
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/*
* eslint-plugin-sonarjs
* Copyright (C) 2018-2021 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.
*/
import { TSESTree } from '@typescript-eslint/experimental-utils';
import { getMainFunctionTokenLocation } from '../utils/locations';
import { Rule } from '../utils/types';
import docsUrl from '../utils/docs-url';
const MESSAGE = 'Add a "yield" statement to this generator.';
const rule: Rule.RuleModule = {
meta: {
type: 'problem',
docs: {
description: 'Generators should "yield" something',
category: 'Possible Errors',
recommended: 'error',
url: docsUrl(__filename),
},
},
create(context: Rule.RuleContext) {
const yieldStack: number[] = [];
function enterFunction() {
yieldStack.push(0);
}
function exitFunction(node: TSESTree.Node) {
const functionNode = node as TSESTree.FunctionExpression | TSESTree.FunctionDeclaration;
const countYield = yieldStack.pop();
if (countYield === 0 && functionNode.body.body.length > 0) {
context.report({
message: MESSAGE,
loc: getMainFunctionTokenLocation(functionNode, node.parent, context),
});
}
}
return {
':function[generator=true]': enterFunction,
':function[generator=true]:exit': exitFunction,
YieldExpression() {
if (yieldStack.length > 0) {
yieldStack[yieldStack.length - 1] += 1;
}
},
};
},
};
export = rule;