/**
   * @fileoverview Rule to flag assignment of the exception parameter
   * @author Stephen Murray <spmurrayzzz>
   */
  
  "use strict";
  
  var astUtils = require("../ast-utils");
  
  //------------------------------------------------------------------------------
  // Rule Definition
  //------------------------------------------------------------------------------
  
  module.exports = function(context) {
  
      /**
       * Finds and reports references that are non initializer and writable.
       * @param {Variable} variable - A variable to check.
       * @returns {void}
       */
      function checkVariable(variable) {
          astUtils.getModifyingReferences(variable.references).forEach(function(reference) {
              context.report(
                  reference.identifier,
                  "Do not assign to the exception parameter.");
          });
      }
  
      return {
          "CatchClause": function(node) {
              context.getDeclaredVariables(node).forEach(checkVariable);
          }
      };
  
  };
  
  module.exports.schema = [];