Support for php namespaces, static methods and yii widgets for Twig

[ofat]

Here is example of using:

in yii we do:

<?php
use yii\bootstrap\Nav;
use yii\bootstrap\NavBar;
use yii\widgets\Breadcrumbs;
use frontend\assets\AppAsset;
use frontend\widgets\Alert;

AppAsset::register($this);
?>
...
<?php
            NavBar::begin([
                'brandLabel' => 'My Company',
                'brandUrl' => Yii::$app->homeUrl,
                'options' => [
                    'class' => 'navbar-inverse navbar-fixed-top',
                ],
            ]);
...
            echo Nav::widget([
                'options' => ['class' => 'navbar-nav navbar-right'],
                'items' => [...],
            ]);
            NavBar::end();
        ?>
        <div class="container">
        <?= Breadcrumbs::widget([
            'links' => $this->params['breadcrumbs']
        ]) ?>
        <?= Alert::widget() ?>
        </div>

With these functions we can do:

{{ use([
    'yii\\bootstrap\\Nav',
    'yii\\bootstrap\\NavBar',    
    'frontend\\assets\\AppAsset',
    'frontend\\widgets\\Alert'
]) }}
{{ static('AppAsset', 'register', this) }}
...
{{ widget_begin('NavBar', { brandLabel: app.name, brandUrl: app.homeUrl, options: { class: 'navbar-inverse navbar-fixed-top' } }) }}            
...
{{ widget('Nav', {options: { class: 'navbar-nav navbar-right' }, items: ...) }}
...
{{ widget_end('NavBar') }}
...
<div class="container">
    {{ widget('yii\\widgets\\Breadcrumbs', {links: this.params['breadcrumbs']}) }}

    {{ widget('Alert') }}
</div>

Also we can define namespaces globally in config files:

'namespaces' => [
    '\yii\bootstrap\NavBar',    
],

[samdark]

Interesting additions. Need to think about it a bit more.

[samdark]

Is it required? PHP returns null by default.

[grachov]

What do you think about such extension? It allows to work with widgets similar to existing form_begin and form_end functions but does not require creating a functions for each widget.

[samdark]

@grachov I wasn't aware of * usage in such way. Looks interesting. Also I like how everything was moved to a separate class. Looks cleaner.

[grachov]

@samdark As I remember in documentation it's described only for filters, but it's working for functions too. There is also a possibility to register a callback that will be called for each unknown function.
I've updated code a little to simplify the usage.

[samdark]

@grachov may I use your code for Yii core? I'll attribute it properly, of course.

[grachov]

Yes, sure. It would be great if you find that code useful :)

[samdark]

@ofat I've used @grachov's code with some enhancements. That should cover your needs. Please test it and create more issues if anything's missing. Thanks!