48 lines
1.2 KiB
JavaScript
48 lines
1.2 KiB
JavaScript
'use strict';
|
|
const {isParenthesized} = require('@eslint-community/eslint-utils');
|
|
|
|
const MESSAGE_ID_TOO_DEEP = 'too-deep';
|
|
const MESSAGE_ID_SHOULD_PARENTHESIZED = 'should-parenthesized';
|
|
const messages = {
|
|
[MESSAGE_ID_TOO_DEEP]: 'Do not nest ternary expressions.',
|
|
[MESSAGE_ID_SHOULD_PARENTHESIZED]: 'Nest ternary expression should be parenthesized.',
|
|
};
|
|
|
|
const nestTernarySelector = level => `:not(ConditionalExpression)${' > ConditionalExpression'.repeat(level)}`;
|
|
|
|
/** @param {import('eslint').Rule.RuleContext} context */
|
|
const create = context => {
|
|
const sourceCode = context.getSourceCode();
|
|
|
|
return {
|
|
[nestTernarySelector(3)]: node =>
|
|
// Nesting more than one level not allowed.
|
|
({node, messageId: MESSAGE_ID_TOO_DEEP}),
|
|
[nestTernarySelector(2)](node) {
|
|
if (!isParenthesized(node, sourceCode)) {
|
|
return {
|
|
node,
|
|
messageId: MESSAGE_ID_SHOULD_PARENTHESIZED,
|
|
fix: fixer => [
|
|
fixer.insertTextBefore(node, '('),
|
|
fixer.insertTextAfter(node, ')'),
|
|
],
|
|
};
|
|
}
|
|
},
|
|
};
|
|
};
|
|
|
|
/** @type {import('eslint').Rule.RuleModule} */
|
|
module.exports = {
|
|
create,
|
|
meta: {
|
|
type: 'suggestion',
|
|
docs: {
|
|
description: 'Disallow nested ternary expressions.',
|
|
},
|
|
fixable: 'code',
|
|
messages,
|
|
},
|
|
};
|