[TwigComponent] Add dynamic component name support

[seb-jean]

Q	A
Bug fix?	no
New feature?	yes
Deprecations?	no
Documentation?	yes
Issues	Fix #2905 / #3395
License	MIT

Add support for dynamic component names in the {% component %} tag, in the HTML-like syntax using <twig:component>, and in the component() function.

{% component %} tag syntax

{# Dynamic variable (must be wrapped in parentheses) #}
{% component (componentName) %}{% endcomponent %}

{# Dynamic expression #}
{% set prefix = 'DynamicNameComponent' %}
{% for i in 1..2 %}
    {% component (prefix ~ i) %}{% endcomponent %}
{% endfor %}

{# Component object #}
{% component (componentObject) %}{% endcomponent %}

HTML-like syntax

{# Static component name #}
<twig:component is="Alert" type="success" />

{# Dynamic component name #}
<twig:component :is="componentName" type="success" />

{# Dynamic with content (paired tag) #}
<twig:component :is="componentName" type="success">
    Content here
</twig:component>

{# Dynamic in a loop #}
{% set prefix = 'DynamicNameComponent' %}
{% for i in 1..2 %}
    <twig:component :is="prefix ~ i" />
{% endfor %}

component() function

{{ component(componentName, {type: 'success'}) }}

[Kocal]

The syntax for the component tag already exists no? Or the PR adding that behavior is still opened?

[seb-jean]

Yes, I'm referring to this PR: #3395, which is still open.