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Unified Diff: mojo/public/python/mojo_bindings/promise.py

Issue 814543006: Move //mojo/{public, edk} underneath //third_party (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Rebase Created 5 years, 11 months ago
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Index: mojo/public/python/mojo_bindings/promise.py
diff --git a/mojo/public/python/mojo_bindings/promise.py b/mojo/public/python/mojo_bindings/promise.py
deleted file mode 100644
index ebf6f85e0dcc034f3346a8a2197170012831bb2b..0000000000000000000000000000000000000000
--- a/mojo/public/python/mojo_bindings/promise.py
+++ /dev/null
@@ -1,196 +0,0 @@
-# Copyright 2014 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-"""
-Promise used by the python bindings.
-
-The API is following the ECMAScript 6 API for promises.
-"""
-
-import sys
-
-
-class Promise(object):
- """The promise object."""
-
- STATE_PENDING = 0
- STATE_FULLFILLED = 1
- STATE_REJECTED = 2
- STATE_BOUND = 3
-
- def __init__(self, generator_function):
- """
- Constructor.
-
- Args:
- generator_function: A function taking 2 arguments: resolve and reject.
- When |resolve| is called, the promise is fullfilled with the given value.
- When |reject| is called, the promise is rejected with the given value.
- A promise can only be resolved or rejected once, all following calls will
- have no effect.
- """
- self._onCatched = []
- self._onFulfilled = []
- self._onRejected = []
- self._state = Promise.STATE_PENDING
- self._result = None
- try:
- generator_function(self._Resolve, self._Reject)
- except Exception as e:
- # Adding traceback similarly to python 3.0 (pep-3134)
- e.__traceback__ = sys.exc_info()[2]
- self._Reject(e)
-
- @staticmethod
- def Resolve(value):
- """
- If value is a promise, make a promise that have the same behavior as value,
- otherwise make a promise that fulfills to value.
- """
- if isinstance(value, Promise):
- return value
- return Promise(lambda x, y: x(value))
-
- @staticmethod
- def Reject(reason):
- "Make a promise that rejects to reason."""
- return Promise(lambda x, y: y(reason))
-
- @staticmethod
- def All(*iterable):
- """
- Make a promise that fulfills when every item in the array fulfills, and
- rejects if (and when) any item rejects. Each array item is passed to
- Promise.resolve, so the array can be a mixture of promise-like objects and
- other objects. The fulfillment value is an array (in order) of fulfillment
- values. The rejection value is the first rejection value.
- """
- def GeneratorFunction(resolve, reject):
- state = {
- 'rejected': False,
- 'nb_resolved': 0,
- }
- promises = [Promise.Resolve(x) for x in iterable]
- results = [None for x in promises]
- def OnFullfilled(i):
- def OnFullfilled(res):
- if state['rejected']:
- return
- results[i] = res
- state['nb_resolved'] = state['nb_resolved'] + 1
- if state['nb_resolved'] == len(results):
- resolve(results)
- return OnFullfilled
- def OnRejected(reason):
- if state['rejected']:
- return
- state['rejected'] = True
- reject(reason)
-
- for (i, promise) in enumerate(promises):
- promise.Then(OnFullfilled(i), OnRejected)
- return Promise(GeneratorFunction)
-
- @staticmethod
- def Race(*iterable):
- """
- Make a Promise that fulfills as soon as any item fulfills, or rejects as
- soon as any item rejects, whichever happens first.
- """
- def GeneratorFunction(resolve, reject):
- state = {
- 'ended': False
- }
- def OnEvent(callback):
- def OnEvent(res):
- if state['ended']:
- return
- state['ended'] = True
- callback(res)
- return OnEvent
- for promise in [Promise.Resolve(x) for x in iterable]:
- promise.Then(OnEvent(resolve), OnEvent(reject))
- return Promise(GeneratorFunction)
-
- @property
- def state(self):
- if isinstance(self._result, Promise):
- return self._result.state
- return self._state
-
- def Then(self, onFullfilled=None, onRejected=None):
- """
- onFulfilled is called when/if this promise resolves. onRejected is called
- when/if this promise rejects. Both are optional, if either/both are omitted
- the next onFulfilled/onRejected in the chain is called. Both callbacks have
- a single parameter, the fulfillment value or rejection reason. |Then|
- returns a new promise equivalent to the value you return from
- onFulfilled/onRejected after being passed through Resolve. If an
- error is thrown in the callback, the returned promise rejects with that
- error.
- """
- if isinstance(self._result, Promise):
- return self._result.Then(onFullfilled, onRejected)
- def GeneratorFunction(resolve, reject):
- if self._state == Promise.STATE_PENDING:
- self._onFulfilled.append(_Delegate(resolve, reject, onFullfilled))
- self._onRejected.append(_Delegate(reject, reject, onRejected))
- if self._state == self.STATE_FULLFILLED:
- _Delegate(resolve, reject, onFullfilled)(self._result)
- if self._state == self.STATE_REJECTED:
- recover = reject
- if onRejected:
- recover = resolve
- _Delegate(recover, reject, onRejected)(self._result)
- return Promise(GeneratorFunction)
-
- def Catch(self, onCatched):
- """Equivalent to |Then(None, onCatched)|"""
- return self.Then(None, onCatched)
-
- def _Resolve(self, value):
- if self.state != Promise.STATE_PENDING:
- return
- self._result = value
- if isinstance(value, Promise):
- self._state = Promise.STATE_BOUND
- self._result.Then(_IterateAction(self._onFulfilled),
- _IterateAction(self._onRejected))
- return
- self._state = Promise.STATE_FULLFILLED
- for f in self._onFulfilled:
- f(value)
- self._onFulfilled = None
- self._onRejected = None
-
- def _Reject(self, reason):
- if self.state != Promise.STATE_PENDING:
- return
- self._result = reason
- self._state = Promise.STATE_REJECTED
- for f in self._onRejected:
- f(reason)
- self._onFulfilled = None
- self._onRejected = None
-
-
-def _IterateAction(iterable):
- def _Run(x):
- for f in iterable:
- f(x)
- return _Run
-
-
-def _Delegate(resolve, reject, action):
- def _Run(x):
- try:
- if action:
- resolve(action(x))
- else:
- resolve(x)
- except Exception as e:
- # Adding traceback similarly to python 3.0 (pep-3134)
- e.__traceback__ = sys.exc_info()[2]
- reject(e)
- return _Run
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