Generator comprehensions

[hikari-no-yume]

Like list comprehensions, but produces a generator. Python has these.

I know @gosukiwi stated that we don't want to require PHP 5.5+, but it wouldn't stop people with 5.4 using Blueberry, they just couldn't use generator comprehensions.

Ideal syntax:

• [2 * i for i in [1..10] where i % 2 == 0] - list comprehension
• (2 * i for i in [1..10] where i % 2 == 0) - generator comprehension

[gosukiwi]

I love lazy collections. Generator comprehensions could easily be implemented on PHP 5.5+ using yield.

result = function($collection) {
    foreach($collection as $item) {
         yield $item;
    }
}

Something I really like of PHP 5.4 is Traits, which would be an elegant way to implement Ruby-like modules. I'll leave this pull request open so anyone willing to implement Generator Comprehensions can submit a pull request :smile:

[hikari-no-yume]

Generators are a 5.5 thing, not 5.4.

[gosukiwi]

My bad. Fixed it.

[hikari-no-yume]

Well, Traits are a 5.4 thing. ;)

[gosukiwi]

Them PHP versions :stuck_out_tongue: