Make Twig Bridge compatible with Twig 3.0

[mhujer]

Twig provides namespaced class aliases since 1.38.1 and 2.12.1, so this should work on all recently released Twig versions.

[mhujer]

This ensures that the library is not installed along with an incompatible Twig version.

[mhujer]

The non-namespaced classes were removed in 3.0

[florianeckerstorfer]

Awesome, could you update the PR with the latest changes from master and see if the tests pass?

[mhujer]

@florianeckerstorfer rebased, but the build is failing for <PHP7.0 probably because of the conflict rule. I spent some time trying to figure it out, but without success.

Either the conflict rule can be removed, or the support for long-dead PHP versions can be dropped.

[kubawerlos]

@mhujer the conflict you have added - <1.38.1||<2.12.1 works like this:

• Hey, I am Twig 1.39, can I be installed?
• Let's check: 1.39 < 1.38.1 || 1.39 < 2.12.1 => false || true => true => CONFLICT! - sorry mate, you have raised a conflict, you can't be installed

We can go 2 ways:

• bump the requirements in require as you did
• create the "proxy" class, something like https://github.com/FriendsOfPHP/PHP-CS-Fixer/blob/v2.16.1/src/Event/Event.php#L18

[mhujer]

@kubawerlos thanks for pointing that out! I didn't occur to me before.

I fixed it by specifying the ranges with lower band:

    "conflict": {
        "twig/twig": ">=1,<1.38.1|>=2,<2.12.1"
    },

(got inspiration from https://github.com/Roave/SecurityAdvisories/blob/master/composer.json - they have quite a few conflict rules there).

[florianeckerstorfer]

I have absolutely no knowledge about the conflict rules in Composer, @kubawerlos do you think this is fine now?

[kubawerlos]

@florianeckerstorfer looks fine