60 lines
1.5 KiB
JavaScript
60 lines
1.5 KiB
JavaScript
import {isParenthesized} from '@eslint-community/eslint-utils';
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const MESSAGE_ID_TOO_DEEP = 'too-deep';
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const MESSAGE_ID_SHOULD_PARENTHESIZED = 'should-parenthesized';
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const messages = {
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[MESSAGE_ID_TOO_DEEP]: 'Do not nest ternary expressions.',
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[MESSAGE_ID_SHOULD_PARENTHESIZED]: 'Nested ternary expression should be parenthesized.',
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};
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/** @param {import('eslint').Rule.RuleContext} context */
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const create = context => ({
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ConditionalExpression(node) {
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if ([
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node.test,
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node.consequent,
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node.alternate,
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].some(node => node.type === 'ConditionalExpression')) {
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return;
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}
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const {sourceCode} = context;
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const ancestors = sourceCode.getAncestors(node).toReversed();
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const nestLevel = ancestors.findIndex(node => node.type !== 'ConditionalExpression');
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if (nestLevel === 1 && !isParenthesized(node, sourceCode)) {
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return {
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node,
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messageId: MESSAGE_ID_SHOULD_PARENTHESIZED,
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fix: fixer => [
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fixer.insertTextBefore(node, '('),
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fixer.insertTextAfter(node, ')'),
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],
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};
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}
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// Nesting more than one level not allowed
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if (nestLevel > 1) {
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return {
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node: nestLevel > 2 ? ancestors[nestLevel - 3] : node,
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messageId: MESSAGE_ID_TOO_DEEP,
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};
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}
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},
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});
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/** @type {import('eslint').Rule.RuleModule} */
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const config = {
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create,
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meta: {
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type: 'suggestion',
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docs: {
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description: 'Disallow nested ternary expressions.',
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recommended: true,
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},
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fixable: 'code',
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messages,
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},
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};
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export default config;
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