Support Hack (PHP-like)

[fredemmott]

most files would work simply by pretending '<?hh' files are PHP - there is some extra syntax though, that would be good to also support:

XHP (XML-like literals)

$foo = <div class={$bar}>{$baz}</div>;

class :myclass extends :x:element {
  attribute string myattr @required;
/* ... */
}

$herp = <myclass myattr="myvalue" />;

More info: https://docs.hhvm.com/hack/XHP/introduction

Collection object literals

$foo = Vector { 'herp', 'derp' };
$bar = Map { 'herp' => 'derp' };

https://docs.hhvm.com/hack/collections/introduction

Short lambdas

$square_func = $x ==> $x * $x;
var_dump($square_func(2)); // outputs 4

$two_args = ($x, $y) ==> $x + $y;

nullable

function foo(?MyClass $my_class_or_null) {
}

callable types

function do_stuff((function(int $x): string) $callback) {
 // callback() takes an int and returns a string

Generics

https://docs.hhvm.com/hack/generics/introduction

class Foo<T> { ... }

async/await

There's a lot of these: pretty much needs the whole section going through: https://docs.hhvm.com/hack/async/introduction

[stale]

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[pyrmont]

Support for Hack has subsequently been added to Rouge. If there are any issues with the implementation, please let us know!