"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.LazyObjectsSerializer = undefined;

var _slicedToArray = function () { function sliceIterator(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"]) _i["return"](); } finally { if (_d) throw _e; } } return _arr; } return function (arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { return sliceIterator(arr, i); } else { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } }; }();

var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();

var _get = function get(object, property, receiver) { if (object === null) object = Function.prototype; var desc = Object.getOwnPropertyDescriptor(object, property); if (desc === undefined) { var parent = Object.getPrototypeOf(object); if (parent === null) { return undefined; } else { return get(parent, property, receiver); } } else if ("value" in desc) { return desc.value; } else { var getter = desc.get; if (getter === undefined) { return undefined; } return getter.call(receiver); } };

var _realm = require("../realm.js");

var _index = require("../values/index.js");

var _babelTypes = require("babel-types");

var t = _interopRequireWildcard(_babelTypes);

var _invariant = require("../invariant.js");

var _invariant2 = _interopRequireDefault(_invariant);

var _types = require("./types.js");

var _logger = require("./logger.js");

var _modules = require("./modules.js");

var _ResidualHeapInspector = require("./ResidualHeapInspector.js");

var _ResidualHeapValueIdentifiers = require("./ResidualHeapValueIdentifiers.js");

var _ResidualHeapSerializer = require("./ResidualHeapSerializer.js");

var _utils = require("./utils.js");

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

function _possibleConstructorReturn(self, call) { if (!self) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return call && (typeof call === "object" || typeof call === "function") ? call : self; }

function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function, not " + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; } /**
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                * Copyright (c) 2017-present, Facebook, Inc.
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                * All rights reserved.
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                *
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                * This source code is licensed under the BSD-style license found in the
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                * LICENSE file in the root directory of this source tree. An additional grant
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                * of patent rights can be found in the PATENTS file in the same directory.
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                */

var LAZY_OBJECTS_SERIALIZER_BODY_TYPE = "LazyObjectInitializer";

/**
 * Serialize objects in lazy mode by leveraging the JS runtime that support this feature.
 * Objects are serialized into two parts:
 * 1. All lazy objects are created via lightweight LazyObjectsRuntime.createLazyObject() call.
 * 2. Lazy objects' property assignments are delayed in a callback function which is registered with the runtime.
 *    lazy objects runtime will execute this callback to hydrate the lazy objects.
 *
 * Currently only the raw objects are taking part in the lazy objects feature.
 * TODO: support for other objects, like array, regex etc...
 */

var LazyObjectsSerializer = exports.LazyObjectsSerializer = function (_ResidualHeapSerializ) {
  _inherits(LazyObjectsSerializer, _ResidualHeapSerializ);

  function LazyObjectsSerializer(realm, logger, modules, residualHeapValueIdentifiers, residualHeapInspector, residualValues, residualFunctionInstances, residualFunctionInfos, options, referencedDeclaredValues, additionalFunctionValuesAndEffects, additionalFunctionValueInfos, declarativeEnvironmentRecordsBindings, statistics, react) {
    _classCallCheck(this, LazyObjectsSerializer);

    var _this = _possibleConstructorReturn(this, (LazyObjectsSerializer.__proto__ || Object.getPrototypeOf(LazyObjectsSerializer)).call(this, realm, logger, modules, residualHeapValueIdentifiers, residualHeapInspector, residualValues, residualFunctionInstances, residualFunctionInfos, options, referencedDeclaredValues, additionalFunctionValuesAndEffects, additionalFunctionValueInfos, declarativeEnvironmentRecordsBindings, statistics, react));

    _this._lazyObjectIdSeed = 1;
    _this._valueLazyIds = new Map();
    _this._lazyObjectInitializers = new Map();
    _this._callbackLazyObjectParam = t.identifier("obj");
    (0, _invariant2.default)(_this._options.lazyObjectsRuntime != null);
    _this._lazyObjectJSRuntimeName = t.identifier(_this._options.lazyObjectsRuntime);
    _this._initializationCallbackName = t.identifier("__initializerCallback");
    return _this;
  }
  // Holds object's lazy initializer bodies.
  // These bodies will be combined into a well-known callback after generator serialization is done and registered with the runtime.


  _createClass(LazyObjectsSerializer, [{
    key: "_getValueLazyId",
    value: function _getValueLazyId(obj) {
      var _this2 = this;

      return (0, _utils.getOrDefault)(this._valueLazyIds, obj, function () {
        return _this2._lazyObjectIdSeed++;
      });
    }

    // TODO: change to use _getTarget() to get the lazy objects initializer body.

  }, {
    key: "_serializeLazyObjectInitializer",
    value: function _serializeLazyObjectInitializer(obj) {
      var initializerBody = { type: LAZY_OBJECTS_SERIALIZER_BODY_TYPE, parentBody: undefined, entries: [] };
      var oldBody = this.emitter.beginEmitting(LAZY_OBJECTS_SERIALIZER_BODY_TYPE, initializerBody);
      this._emitObjectProperties(obj);
      this.emitter.endEmitting(LAZY_OBJECTS_SERIALIZER_BODY_TYPE, oldBody);
      return initializerBody;
    }
  }, {
    key: "_serializeLazyObjectInitializerSwitchCase",
    value: function _serializeLazyObjectInitializerSwitchCase(obj, initializer) {
      // TODO: only serialize this switch case if the initializer(property assignment) is not empty.
      var caseBody = initializer.entries.concat(t.breakStatement());
      var lazyId = this._getValueLazyId(obj);
      return t.switchCase(t.numericLiteral(lazyId), caseBody);
    }
  }, {
    key: "_serializeInitializationCallback",
    value: function _serializeInitializationCallback() {
      var body = [];

      var switchCases = [];
      var _iteratorNormalCompletion = true;
      var _didIteratorError = false;
      var _iteratorError = undefined;

      try {
        for (var _iterator = this._lazyObjectInitializers[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
          var _ref = _step.value;

          var _ref2 = _slicedToArray(_ref, 2);

          var obj = _ref2[0];
          var initializer = _ref2[1];

          switchCases.push(this._serializeLazyObjectInitializerSwitchCase(obj, initializer));
        }
        // Default case.
      } catch (err) {
        _didIteratorError = true;
        _iteratorError = err;
      } finally {
        try {
          if (!_iteratorNormalCompletion && _iterator.return) {
            _iterator.return();
          }
        } finally {
          if (_didIteratorError) {
            throw _iteratorError;
          }
        }
      }

      switchCases.push(t.switchCase(null, [t.throwStatement(t.newExpression(t.identifier("Error"), [t.stringLiteral("Unknown lazy id")]))]));

      var selector = t.identifier("id");
      body.push(t.switchStatement(selector, switchCases));

      var params = [this._callbackLazyObjectParam, selector];
      var initializerCallbackFunction = t.functionExpression(null, params, t.blockStatement(body));
      // TODO: use NameGenerator.
      return t.variableDeclaration("var", [t.variableDeclarator(this._initializationCallbackName, initializerCallbackFunction)]);
    }
  }, {
    key: "_serializeRegisterInitializationCallback",
    value: function _serializeRegisterInitializationCallback() {
      return t.expressionStatement(t.callExpression(t.memberExpression(this._lazyObjectJSRuntimeName, t.identifier("setLazyObjectInitializer")), [this._initializationCallbackName]));
    }
  }, {
    key: "_serializeCreateLazyObject",
    value: function _serializeCreateLazyObject(obj) {
      var lazyId = this._getValueLazyId(obj);
      return t.callExpression(t.memberExpression(this._lazyObjectJSRuntimeName, t.identifier("createLazyObject"), /*computed*/false), [t.numericLiteral(lazyId)]);
    }

    /**
     * Check if the object currently being emitted is lazy object(inside _lazyObjectInitializers map) and
     * that its emitting body is the offspring of this lazy object's initializer body.
     * This is needed because for "lazy1.p = lazy2" case,
     * we need to replace "lazy1" with "obj" but not for "lazy2".
     * The offspring checking is needed because object may be emitting in a "ConditionalAssignmentBranch" of
     * lazy object's initializer body.
     */

  }, {
    key: "_isEmittingIntoLazyObjectInitializerBody",
    value: function _isEmittingIntoLazyObjectInitializerBody(obj) {
      var objLazyBody = this._lazyObjectInitializers.get(obj);
      return objLazyBody !== undefined && this.emitter.isCurrentBodyOffspringOf(objLazyBody);
    }

    // Override default behavior.
    // Inside lazy objects callback, the lazy object identifier needs to be replaced with the
    // parameter passed from the runtime.

  }, {
    key: "getSerializeObjectIdentifier",
    value: function getSerializeObjectIdentifier(val) {
      return val instanceof _index.ObjectValue && this._isEmittingIntoLazyObjectInitializerBody(val) ? this._callbackLazyObjectParam : _get(LazyObjectsSerializer.prototype.__proto__ || Object.getPrototypeOf(LazyObjectsSerializer.prototype), "getSerializeObjectIdentifier", this).call(this, val);
    }

    // Override default serializer with lazy mode.

  }, {
    key: "serializeValueRawObject",
    value: function serializeValueRawObject(obj) {
      this._lazyObjectInitializers.set(obj, this._serializeLazyObjectInitializer(obj));
      return this._serializeCreateLazyObject(obj);
    }

    // Override.
    // Serialize the initialization callback and its registration in prelude if there are object being lazied.

  }, {
    key: "postGeneratorSerialization",
    value: function postGeneratorSerialization() {
      if (this._lazyObjectInitializers.size > 0) {
        // Insert initialization callback at the end of prelude code.
        this.prelude.push(this._serializeInitializationCallback());
        this.prelude.push(this._serializeRegisterInitializationCallback());
      }
    }
  }]);

  return LazyObjectsSerializer;
}(_ResidualHeapSerializer.ResidualHeapSerializer);
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