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Viewing file:     core.js (4.71 KB)      -rwxrwxrwx

'use strict';

var asap = require('asap');

function noop() {}

// States:
//
// 0 - pending
// 1 - fulfilled with _value
// 2 - rejected with _value
// 3 - adopted the state of another promise, _value
//
// once the state is no longer pending (0) it is immutable

// All `_` prefixed properties will be reduced to `_{random number}`
// at build time to obfuscate them and discourage their use.
// We don't use symbols or Object.defineProperty to fully hide them
// because the performance isn't good enough.


// to avoid using try/catch inside critical functions, we
// extract them to here.
var LAST_ERROR = null;
var IS_ERROR = {};
function getThen(obj) {
  try {
    return obj.then;
  } catch (ex) {
    LAST_ERROR = ex;
    return IS_ERROR;
  }
}

function tryCallOne(fn, a) {
  try {
    return fn(a);
  } catch (ex) {
    LAST_ERROR = ex;
    return IS_ERROR;
  }
}
function tryCallTwo(fn, a, b) {
  try {
    fn(a, b);
  } catch (ex) {
    LAST_ERROR = ex;
    return IS_ERROR;
  }
}

module.exports = Promise;

function Promise(fn) {
  if (typeof this !== 'object') {
    throw new TypeError('Promises must be constructed via new');
  }
  if (typeof fn !== 'function') {
    throw new TypeError('Promise constructor\'s argument is not a function');
  }
  this._1 = 0;
  this._2 = 0;
  this._3 = null;
  this._4 = null;
  if (fn === noop) return;
  doResolve(fn, this);
}
Promise._5 = null;
Promise._6 = null;
Promise._7 = noop;

Promise.prototype.then = function(onFulfilled, onRejected) {
  if (this.constructor !== Promise) {
    return safeThen(this, onFulfilled, onRejected);
  }
  var res = new Promise(noop);
  handle(this, new Handler(onFulfilled, onRejected, res));
  return res;
};

function safeThen(self, onFulfilled, onRejected) {
  return new self.constructor(function (resolve, reject) {
    var res = new Promise(noop);
    res.then(resolve, reject);
    handle(self, new Handler(onFulfilled, onRejected, res));
  });
}
function handle(self, deferred) {
  while (self._2 === 3) {
    self = self._3;
  }
  if (Promise._5) {
    Promise._5(self);
  }
  if (self._2 === 0) {
    if (self._1 === 0) {
      self._1 = 1;
      self._4 = deferred;
      return;
    }
    if (self._1 === 1) {
      self._1 = 2;
      self._4 = [self._4, deferred];
      return;
    }
    self._4.push(deferred);
    return;
  }
  handleResolved(self, deferred);
}

function handleResolved(self, deferred) {
  asap(function() {
    var cb = self._2 === 1 ? deferred.onFulfilled : deferred.onRejected;
    if (cb === null) {
      if (self._2 === 1) {
        resolve(deferred.promise, self._3);
      } else {
        reject(deferred.promise, self._3);
      }
      return;
    }
    var ret = tryCallOne(cb, self._3);
    if (ret === IS_ERROR) {
      reject(deferred.promise, LAST_ERROR);
    } else {
      resolve(deferred.promise, ret);
    }
  });
}
function resolve(self, newValue) {
  // Promise Resolution Procedure: https://github.com/promises-aplus/promises-spec#the-promise-resolution-procedure
  if (newValue === self) {
    return reject(
      self,
      new TypeError('A promise cannot be resolved with itself.')
    );
  }
  if (
    newValue &&
    (typeof newValue === 'object' || typeof newValue === 'function')
  ) {
    var then = getThen(newValue);
    if (then === IS_ERROR) {
      return reject(self, LAST_ERROR);
    }
    if (
      then === self.then &&
      newValue instanceof Promise
    ) {
      self._2 = 3;
      self._3 = newValue;
      finale(self);
      return;
    } else if (typeof then === 'function') {
      doResolve(then.bind(newValue), self);
      return;
    }
  }
  self._2 = 1;
  self._3 = newValue;
  finale(self);
}

function reject(self, newValue) {
  self._2 = 2;
  self._3 = newValue;
  if (Promise._6) {
    Promise._6(self, newValue);
  }
  finale(self);
}
function finale(self) {
  if (self._1 === 1) {
    handle(self, self._4);
    self._4 = null;
  }
  if (self._1 === 2) {
    for (var i = 0; i < self._4.length; i++) {
      handle(self, self._4[i]);
    }
    self._4 = null;
  }
}

function Handler(onFulfilled, onRejected, promise){
  this.onFulfilled = typeof onFulfilled === 'function' ? onFulfilled : null;
  this.onRejected = typeof onRejected === 'function' ? onRejected : null;
  this.promise = promise;
}

/**
 * Take a potentially misbehaving resolver function and make sure
 * onFulfilled and onRejected are only called once.
 *
 * Makes no guarantees about asynchrony.
 */
function doResolve(fn, promise) {
  var done = false;
  var res = tryCallTwo(fn, function (value) {
    if (done) return;
    done = true;
    resolve(promise, value);
  }, function (reason) {
    if (done) return;
    done = true;
    reject(promise, reason);
  });
  if (!done && res === IS_ERROR) {
    done = true;
    reject(promise, LAST_ERROR);
  }
}