50 lines
1.3 KiB
JavaScript
50 lines
1.3 KiB
JavaScript
"use strict";
|
|
|
|
const ruleComposer = require('eslint-rule-composer');
|
|
const eslint = require('eslint');
|
|
const rule = new eslint.Linter().getRules().get('no-unused-expressions');
|
|
|
|
/**
|
|
* @param {ASTNode} node - any node
|
|
* @returns {boolean} whether the given node is either an IfStatement or an
|
|
* ExpressionStatement and is the last node in the body of a BlockStatement
|
|
*/
|
|
function isFinalStatementInBlockStatement(node) {
|
|
const parent = node.parent;
|
|
return /^(?:If|Expression)Statement$/.test(node.type) &&
|
|
parent.type === 'BlockStatement' &&
|
|
parent.body[parent.body.length - 1] === node;
|
|
}
|
|
|
|
/**
|
|
* @param {ASTNode} node - any node
|
|
* @returns {boolean} whether the given node represents an unbroken chain of
|
|
* tail ExpressionStatements and IfStatements within a DoExpression
|
|
*/
|
|
function isInDoStatement(node) {
|
|
if (!node) return false;
|
|
|
|
if (node.type === 'DoExpression') return true;
|
|
|
|
// this is an `else if`
|
|
if (
|
|
node.type === 'IfStatement' &&
|
|
node.parent &&
|
|
node.parent.type === 'IfStatement'
|
|
) {
|
|
return isInDoStatement(node.parent);
|
|
}
|
|
|
|
if (isFinalStatementInBlockStatement(node)) {
|
|
return isInDoStatement(node.parent.parent);
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
module.exports = ruleComposer.filterReports(
|
|
rule,
|
|
(problem, metadata) => !isInDoStatement(problem.node)
|
|
);
|
|
|