no-label-var.js
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/**
* @fileoverview Rule to flag labels that are the same as an identifier
* @author Ian Christian Myers
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
var astUtils = require("../ast-utils");
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = function(context) {
//--------------------------------------------------------------------------
// Helpers
//--------------------------------------------------------------------------
/**
* Check if the identifier is present inside current scope
* @param {object} scope current scope
* @param {string} name To evaluate
* @returns {boolean} True if its present
* @private
*/
function findIdentifier(scope, name) {
return astUtils.getVariableByName(scope, name) !== null;
}
//--------------------------------------------------------------------------
// Public API
//--------------------------------------------------------------------------
return {
"LabeledStatement": function(node) {
// Fetch the innermost scope.
var scope = context.getScope();
// Recursively find the identifier walking up the scope, starting
// with the innermost scope.
if (findIdentifier(scope, node.label.name)) {
context.report(node, "Found identifier with same name as label.");
}
}
};
};
module.exports.schema = [];