node/tools/eslint/lib/rules/no-lonely-if.js

/**
 * @fileoverview Rule to disallow if as the only statmenet in an else block
 * @author Brandon Mills
 */
"use strict";

//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------

module.exports = function(context) {

    return {
        "IfStatement": function(node) {
            var ancestors = context.getAncestors(),
                parent = ancestors.pop(),
                grandparent = ancestors.pop();

            if (parent && parent.type === "BlockStatement" &&
                    parent.body.length === 1 && grandparent &&
                    grandparent.type === "IfStatement" &&
                    parent === grandparent.alternate) {
                context.report(node, "Unexpected if as the only statement in an else block.");
            }
        }
    };

};

module.exports.schema = [];