/**
   * @fileoverview Rule to warn about using dot notation instead of square bracket notation when possible.
   * @author Josh Perez
   */
  "use strict";
  
  //------------------------------------------------------------------------------
  // Rule Definition
  //------------------------------------------------------------------------------
  
  var validIdentifier = /^[a-zA-Z_$][a-zA-Z0-9_$]*$/;
  var keywords = require("../util/keywords");
  
  module.exports = function(context) {
      var options = context.options[0] || {};
      var allowKeywords = options.allowKeywords === void 0 || !!options.allowKeywords;
  
      var allowPattern;
      if (options.allowPattern) {
          allowPattern = new RegExp(options.allowPattern);
      }
  
      return {
          "MemberExpression": function(node) {
              if (
                  node.computed &&
                  node.property.type === "Literal" &&
                  validIdentifier.test(node.property.value) &&
                  (allowKeywords || keywords.indexOf("" + node.property.value) === -1)
              ) {
                  if (!(allowPattern && allowPattern.test(node.property.value))) {
                      context.report(node, "[" + JSON.stringify(node.property.value) + "] is better written in dot notation.");
                  }
              }
              if (
                  !allowKeywords &&
                  !node.computed &&
                  keywords.indexOf("" + node.property.name) !== -1
              ) {
                  context.report(node, "." + node.property.name + " is a syntax error.");
              }
          }
      };
  };
  
  module.exports.schema = [
      {
          "type": "object",
          "properties": {
              "allowKeywords": {
                  "type": "boolean"
              },
              "allowPattern": {
                  "type": "string"
              }
          },
          "additionalProperties": false
      }
  ];