text: /**
   * @license
   * Copyright 2016 Palantir Technologies, Inc.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  "use strict";
  var __extends = (this && this.__extends) || (function () {
      var extendStatics = Object.setPrototypeOf ||
          ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
          function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
      return function (d, b) {
          extendStatics(d, b);
          function __() { this.constructor = d; }
          d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
      };
  })();
  Object.defineProperty(exports, "__esModule", { value: true });
  var tsutils_1 = require("tsutils");
  var ts = require("typescript");
  var Lint = require("../index");
  var Rule = (function (_super) {
      __extends(Rule, _super);
      function Rule() {
          return _super !== null && _super.apply(this, arguments) || this;
      }
      Rule.prototype.applyWithProgram = function (sourceFile, program) {
          return this.applyWithFunction(sourceFile, function (ctx) { return walk(ctx, program); });
      };
      return Rule;
  }(Lint.Rules.TypedRule));
  /* tslint:disable:object-literal-sort-keys */
  Rule.metadata = {
      ruleName: "restrict-plus-operands",
      description: "When adding two variables, operands must both be of type number or of type string.",
      optionsDescription: "Not configurable.",
      options: null,
      optionExamples: ["true"],
      type: "functionality",
      typescriptOnly: false,
      requiresTypeInfo: true,
  };
  /* tslint:enable:object-literal-sort-keys */
  Rule.INVALID_TYPES_ERROR = "Operands of '+' operation must either be both strings or both numbers";
  exports.Rule = Rule;
  function walk(ctx, program) {
      return ts.forEachChild(ctx.sourceFile, function cb(node) {
          if (tsutils_1.isBinaryExpression(node)) {
              var tc = program.getTypeChecker();
              var leftType = getBaseTypeOfLiteralType(tc.getTypeAtLocation(node.left));
              var rightType = getBaseTypeOfLiteralType(tc.getTypeAtLocation(node.right));
              if (leftType === "invalid" || rightType === "invalid" || leftType !== rightType) {
                  return ctx.addFailureAtNode(node, Rule.INVALID_TYPES_ERROR);
              }
          }
          return ts.forEachChild(node, cb);
      });
  }
  function getBaseTypeOfLiteralType(type) {
      if (Lint.isTypeFlagSet(type, ts.TypeFlags.StringLiteral) || Lint.isTypeFlagSet(type, ts.TypeFlags.String)) {
          return "string";
      }
      else if (Lint.isTypeFlagSet(type, ts.TypeFlags.NumberLiteral) || Lint.isTypeFlagSet(type, ts.TypeFlags.Number)) {
          return "number";
      }
      else if (isUnionType(type) && !Lint.isTypeFlagSet(type, ts.TypeFlags.Enum)) {
          var types = type.types.map(getBaseTypeOfLiteralType);
          return allSame(types) ? types[0] : "invalid";
      }
      else if (Lint.isTypeFlagSet(type, ts.TypeFlags.EnumLiteral)) {
          return getBaseTypeOfLiteralType(type.baseType);
      }
      return "invalid";
  }
  function allSame(array) {
      return array.every(function (value) { return value === array[0]; });
  }
  function isUnionType(type) {
      return Lint.isTypeFlagSet(type, ts.TypeFlags.Union);
  }
  