eslint/lib/rules/no-label-var.js

/**
 * @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 = [];