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952 BJavaScriptView Raw
1/**
2 * @fileoverview Rule to flag comparison where left part is the same as the right
3 * part.
4 * @author Ilya Volodin
5 */
6
7"use strict";
8
9//------------------------------------------------------------------------------
10// Rule Definition
11//------------------------------------------------------------------------------
12
13module.exports = function(context) {
14
15 return {
16
17 "BinaryExpression": function(node) {
18 var operators = ["===", "==", "!==", "!=", ">", "<", ">=", "<="];
19 if (operators.indexOf(node.operator) > -1 &&
20 (node.left.type === "Identifier" && node.right.type === "Identifier" && node.left.name === node.right.name ||
21 node.left.type === "Literal" && node.right.type === "Literal" && node.left.value === node.right.value)) {
22 context.report(node, "Comparing to itself is potentially pointless.");
23 }
24 }
25 };
26
27};
28
29module.exports.schema = [];