Twig Constant Resolver Extension

, _(*1)

Simple Twig plugin to resolve constant on template cache build., _(*2)

Why

For example we have something like this:, _(*3)

{% if usertype == constant('Users::TYPE_TROLL') %}
    Bye-bye
{% else %}
    Hello!
{% endif %}

Without this extension Twig will compile it in something like this:, _(*4)

if (((isset($context["usertype"]) ? $context["usertype"] : null) == twig_constant("Users::TYPE_TROLL"))) {
    // twig_constant will be evaluated in runtime
    echo "Bye-bye";
} else {
    echo "Hello";
}

It will be compiled even if you have no constant with that name. So you will get an error in production., _(*5)

With this extension you can avoid this types of errors cause it will evaluate constants at the build step, so this template will be compiled in something like this:, _(*6)

if (((isset($context["usertype"]) ? $context["usertype"] : null) == Users::TYPE_TROLL)) {
    // constant is resolved at the build step (Users::TYPE_TROLL)
    echo "Bye-bye";
} else {
    echo "Hello";
}

Also in evaluation mode it can be compiled in something like this:, _(*7)

if (((isset($context["usertype"]) ? $context["usertype"] : null) == 2)) {
    // constant is resolved and evaluated at the build step (Users::TYPE_TROLL => 2)
    echo "Bye-bye";
} else {
    echo "Hello";
}

Installation

The extension is installable via composer:, _(*8)

{
    "require": {
        "silent/twig-const-resolver": "~1.1"
    }
}

Setup

$twig->addExtension(
    /**
     * @param $evaluate bool Evaluate consts (default: false)
     */
    new \silent\Twig\ConstantResolverExtension\Extension()
);