Created
May 1, 2013 19:17
-
-
Save zmughal/5497614 to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
#!/usr/bin/env perl6 | |
use Test; | |
class Promise { | |
enum State <PENDING FULFILLED REJECTED>; | |
has State $.state = PENDING; | |
has @.fulfill-queue; | |
has @.reject-queue; | |
has $.value; | |
has $.reason; | |
method fulfill($value) { | |
return if $!state != PENDING; | |
$!state = FULFILLED; | |
while my $cb = @!fulfill-queue.shift { | |
$cb( $value ); | |
} | |
} | |
method reject($reason) { | |
return if $!state != PENDING; | |
$!state = REJECTED; | |
while my $cb = @!reject-queue.shift { | |
$cb( $reason ) | |
} | |
} | |
method then(&onFulfilled, &onRejected?) { | |
if $!state == PENDING { | |
@!fulfill-queue.push: &onFulfilled; | |
@!reject-queue.push: &onRejected if &onRejected; | |
} elsif $!state == FULFILLED { | |
&onFulfilled($!value); | |
} elsif $!state == REJECTED { | |
&onRejected($!reason); | |
} | |
return self; | |
} | |
} | |
{ | |
my $promise = Promise.new; | |
my $value = 0; | |
$promise.then(sub ( $arg ) { $value = $arg }); | |
ok !$value, "Hasn't been fulfilled yet"; | |
$promise.fulfill("OH HAI"); | |
is $promise.state, Promise::State::FULFILLED, "Correct state"; | |
is $value, "OH HAI", "Code has been run"; | |
} | |
{ | |
my $promise = Promise.new(state => Promise::State::FULFILLED, value => "yay!"); | |
is $promise.state, Promise::State::FULFILLED, "Already correct state"; | |
my $value = 0; | |
$promise.then( sub ( $arg ) { $value = $arg }); | |
is $value, "yay!", "Code ran immediately"; | |
} | |
{ | |
my $promise = Promise.new; | |
my $value = 0; | |
my $reason = 0; | |
$promise.then( sub ( $arg ) { $value = $arg }, sub ( $arg ) { $reason = $arg }); | |
ok !$reason, "Hasn't been rejected yet"; | |
$promise.reject("OH NOES"); | |
is $promise.state, "REJECTED", "Correct state"; | |
ok !$value, "Fulfill code didn't run"; | |
is $reason, "OH NOES", "Reject code has been run"; | |
} | |
{ | |
my $promise = Promise.new; | |
my $value = 0; | |
$promise.then(sub ( $arg ) { $value++ }); | |
$promise.then(sub ( $arg ) { $value++ }); | |
$promise.then(sub ( $arg ) { $value++ }); | |
ok !$value, "Hasn't been fulfilled yet"; | |
$promise.fulfill("OH HAI"); | |
is $promise.state, Promise::State::FULFILLED, "Correct state"; | |
is $value, 3, "Code has been run"; | |
} | |
done; |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment