prepack/lib/intrinsics/ecma262/Date.js

Execute a JS bundle, serialize global state and side effects to a snapshot that can be quickly restored.

"use strict";

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

exports.default = function (realm) {
  let lastNow;
  let offsetGenerator;
  function getCurrentTime() {
    if (realm.useAbstractInterpretation) {
      return _index.AbstractValue.createTemporalFromTemplate(realm, buildDateNow, _index.NumberValue, [], {
        isPure: true,
        skipInvariant: true
      });
    } else {
      let newNow = Date.now();
      if (realm.strictlyMonotonicDateNow && lastNow >= newNow) {
        if (!offsetGenerator) offsetGenerator = (0, _seedrandom2.default)(0);
        // certain behaviors in the test262 test suite can only be (reliably) triggered if Date.now() is strictly monotonically increasing
        // TODO #1004: Set the strictlyMonotonicDateNow option on the realm in the test262 test runner, fix the issues that will come up in the tests, and remove this comment.
        newNow = lastNow + 1 + Math.floor(offsetGenerator() * 500);
      }
      lastNow = newNow;
      return new _index.NumberValue(realm, newNow);
    }
  }

  // ECMA262 20.3.2
  let func = new _index.NativeFunctionValue(realm, "Date", "Date", 7, (context, args, argCount, NewTarget) => {
    if (argCount >= 2) {
      // ECMA262 20.3.2.1
      let [year, month, date, hours, minutes, seconds, ms] = args;

      // 1. Let numberOfArgs be the number of arguments passed to this function call.
      let numberOfArgs = argCount;

      // 2. Assert: numberOfArgs ≥ 2.
      (0, _invariant2.default)(numberOfArgs >= 2, "expected two or more arguments");

      // 3. If NewTarget is not undefined, then
      if (NewTarget) {
        // a. Let y be ? ToNumber(year).
        let y = _singletons.To.ToNumber(realm, year);

        // b. Let m be ? ToNumber(month).
        let m = _singletons.To.ToNumber(realm, month);

        // c. If date is supplied, let dt be ? ToNumber(date); else let dt be 1.
        let dt = argCount >= 3 ? _singletons.To.ToNumber(realm, date) : 1;

        // d. If hours is supplied, let h be ? ToNumber(hours); else let h be 0.
        let h = argCount >= 4 ? _singletons.To.ToNumber(realm, hours) : 0;

        // e. If minutes is supplied, let min be ? ToNumber(minutes); else let min be 0.
        let min = argCount >= 5 ? _singletons.To.ToNumber(realm, minutes) : 0;

        // f. If seconds is supplied, let s be ? ToNumber(seconds); else let s be 0.
        let s = argCount >= 6 ? _singletons.To.ToNumber(realm, seconds) : 0;

        // g. If ms is supplied, let milli be ? ToNumber(ms); else let milli be 0.
        let milli = argCount >= 7 ? _singletons.To.ToNumber(realm, ms) : 0;

        // h. If y is not NaN and 0 ≤ ToInteger(y) ≤ 99, let yr be 1900+ToInteger(y); otherwise, let yr be y.
        let yr;
        if (!isNaN(y) && _singletons.To.ToInteger(realm, y) >= 0 && _singletons.To.ToInteger(realm, y) <= 99) {
          yr = 1900 + _singletons.To.ToInteger(realm, new _index.NumberValue(realm, y));
        } else {
          yr = y;
        }

        // i. Let finalDate be MakeDate(MakeDay(yr, m, dt), MakeTime(h, min, s, milli)).
        let finalDate = (0, _date.MakeDate)(realm, (0, _date.MakeDay)(realm, yr, m, dt), (0, _date.MakeTime)(realm, h, min, s, milli));

        // j. Let O be ? OrdinaryCreateFromConstructor(NewTarget, "%DatePrototype%", « [[DateValue]] »).
        let O = _singletons.Create.OrdinaryCreateFromConstructor(realm, NewTarget, "DatePrototype", { $DateValue: undefined });

        // k. Set the [[DateValue]] internal slot of O to TimeClip(UTC(finalDate)).
        O.$DateValue = (0, _date.TimeClip)(realm, (0, _date.UTC)(realm, finalDate));

        // l. Return O.
        return O;
      } else {
        // 4. Else,
        // a. Let now be the Number that is the time value (UTC) identifying the current time.
        let now = getCurrentTime().throwIfNotConcreteNumber().value;

        // b. Return ToDateString(now).
        return new _index.StringValue(realm, (0, _date.ToDateString)(realm, now));
      }
    } else if (argCount === 1) {
      // ECMA262 20.3.2.2
      let [value_] = args;
      let value = value_.throwIfNotConcrete();

      // 1. Let numberOfArgs be the number of arguments passed to this function call.
      let numberOfArgs = argCount;

      // 2. Assert: numberOfArgs = 1.
      (0, _invariant2.default)(numberOfArgs === 1, "expected number of arguments to equal 1");

      // 3. If NewTarget is not undefined, then
      if (NewTarget) {
        let tv;

        // a. If Type(value) is Object and value has a [[DateValue]] internal slot, then
        if (value instanceof _index.ObjectValue && value.$DateValue !== undefined) {
          // i. Let tv be thisTimeValue(value).
          tv = (0, _date.thisTimeValue)(realm, value);
        } else {
          // b. Else,
          // i. Let v be ? ToPrimitive(value)
          let v = _singletons.To.ToPrimitive(realm, value);

          // ii. If Type(v) is String, then
          if (v instanceof _index.StringValue) {
            // 1. Let tv be the result of parsing v as a date, in exactly the same manner as for the parse
            //    method (20.3.3.2). If the parse resulted in an abrupt completion, tv is the Completion Record.
            tv = new _index.NumberValue(realm, new Date(v.value).getTime());

            // 2. ReturnIfAbrupt(tv).
          } else {
            // iii. Else,
            // 1. Let tv be ? ToNumber(v).
            tv = new _index.NumberValue(realm, _singletons.To.ToNumber(realm, v));
          }
        }

        // c. Let O be ? OrdinaryCreateFromConstructor(NewTarget, "%DatePrototype%", « [[DateValue]] »).
        let O = _singletons.Create.OrdinaryCreateFromConstructor(realm, NewTarget, "DatePrototype", { $DateValue: undefined });

        // d. Set the [[DateValue]] internal slot of O to TimeClip(tv).
        O.$DateValue = (0, _date.TimeClip)(realm, tv);

        // e. Return O.
        return O;
      } else {
        // 4. Else,
        // a. Let now be the Number that is the time value (UTC) identifying the current time.
        let now = getCurrentTime().throwIfNotConcreteNumber().value;

        // b. Return ToDateString(now).
        return new _index.StringValue(realm, (0, _date.ToDateString)(realm, now));
      }
    } else {
      // ECMA262 20.3.2.3

      // 1. Let numberOfArgs be the number of arguments passed to this function call.
      let numberOfArgs = argCount;

      // 2. Assert: numberOfArgs = 0.
      (0, _invariant2.default)(numberOfArgs === 0, "expected zero arguments");

      // 3. If NewTarget is not undefined, then
      if (NewTarget) {
        // a. Let O be ? OrdinaryCreateFromConstructor(NewTarget, "%DatePrototype%", « [[DateValue]] »).
        let O = _singletons.Create.OrdinaryCreateFromConstructor(realm, NewTarget, "DatePrototype", { $DateValue: undefined });

        // b. Set the [[DateValue]] internal slot of O to the time value (UTC) identifying the current time.
        O.$DateValue = getCurrentTime();

        // c. Return O.
        return O;
      } else {
        // 4. Else,
        // a. Let now be the Number that is the time value (UTC) identifying the current time.
        let now = getCurrentTime().throwIfNotConcreteNumber().value;

        // b. Return ToDateString(now).
        return new _index.StringValue(realm, (0, _date.ToDateString)(realm, now));
      }
    }
  });

  // ECMA262 20.3.3.1
  func.defineNativeMethod("now", 0, context => {
    return getCurrentTime();
  });

  // ECMA262 20.3.3.2
  func.defineNativeMethod("parse", 1, (context, [string]) => {
    if (realm.useAbstractInterpretation) {
      _index.AbstractValue.reportIntrospectionError(string);
      throw new _errors.FatalError();
    } else {
      const parsedDate = Date.parse(string.value);
      return new _index.NumberValue(realm, parsedDate);
    }
  });

  // ECMA262 20.3.3.4
  func.defineNativeMethod("UTC", 7, (context, [year, month, date, hours, minutes, seconds, ms], argCount) => {
    // 1. Let y be ? ToNumber(year).
    let y = _singletons.To.ToNumber(realm, year);

    // 2. Let m be ? ToNumber(month).
    let m = argCount >= 2 ? _singletons.To.ToNumber(realm, month) : 0;

    // 3. If date is supplied, let dt be ? ToNumber(date); else let dt be 1.
    let dt = argCount >= 3 ? _singletons.To.ToNumber(realm, date) : 1;

    // 4. If hours is supplied, let h be ? ToNumber(hours); else let h be 0.
    let h = argCount >= 4 ? _singletons.To.ToNumber(realm, hours) : 0;

    // 5. If minutes is supplied, let min be ? ToNumber(minutes); else let min be 0.
    let min = argCount >= 5 ? _singletons.To.ToNumber(realm, minutes) : 0;

    // 6. If seconds is supplied, let s be ? ToNumber(seconds); else let s be 0.
    let s = argCount >= 6 ? _singletons.To.ToNumber(realm, seconds) : 0;

    // 7. If ms is supplied, let milli be ? ToNumber(ms); else let milli be 0.
    let milli = argCount >= 7 ? _singletons.To.ToNumber(realm, ms) : 0;

    // 8. If y is not NaN and 0 ≤ ToInteger(y) ≤ 99, let yr be 1900+ToInteger(y); otherwise, let yr be y.
    let yr = !isNaN(y) && _singletons.To.ToInteger(realm, y) >= 0 && _singletons.To.ToInteger(realm, y) <= 99 ? 1900 + _singletons.To.ToInteger(realm, y) : y;

    // 9. Return TimeClip(MakeDate(MakeDay(yr, m, dt), MakeTime(h, min, s, milli))).
    return (0, _date.TimeClip)(realm, (0, _date.MakeDate)(realm, (0, _date.MakeDay)(realm, yr, m, dt), (0, _date.MakeTime)(realm, h, min, s, milli)));
  });

  return func;
};

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

var _singletons = require("../../singletons.js");

var _date = require("../../methods/date.js");

var _errors = require("../../errors.js");

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

var _invariant2 = _interopRequireDefault(_invariant);

var _builder = require("../../utils/builder.js");

var _builder2 = _interopRequireDefault(_builder);

var _seedrandom = require("seedrandom");

var _seedrandom2 = _interopRequireDefault(_seedrandom);

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

/**
 * 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.
 */

const buildDateNowSrc = "global.Date.now()";
const buildDateNow = (0, _builder2.default)(buildDateNowSrc);
//# sourceMappingURL=Date.js.map