Terrific Twig

Extension to embrace the Terrific frontend methodology in Twig.

Adds a custom component tag to Twig which mimics the Nitro handlebars helper.

Installation

Using composer:

$ composer require namics/terrific-twig

Requirements

The following versions of PHP are currently supported.

• 8.0
• 8.1

Setup

Step 1: Implement TemplateInformationProvider

class TemplateInformationProvider implements TemplateInformationProviderInterface
{
    public function getPaths() {
    /* List of path where Terrific Components can be found, e.g.
      @code
      [
        '/var/www/example.com/frontend/src/atoms',
        '/var/www/example.com/frontend/src/molecules',
        '/var/www/example.com/frontend/src/organisms'
      ]
      @endcode */
      return [];
    }
}

Step 2: Implement ContextProviderInterface

class ContextProvider implements ContextProviderInterface
{
    public function compile(\Twig\Compiler $compiler, \Twig\Node\Node $component, \Twig\Node\Node $dataVariant, $only) {
        // ...
    }
}

Step 3: Add TerrificLoader

$loader = ...;
$chain = new \Twig\Loader\ChainLoader([$loader, new TerrificLoader(new TemplateInformationProvider)]);
$twig = new \Twig\Environment($chain);

Step 4: Add TerrificExtension

$twig = new \Twig\Environment($chain);
$twig->addExtension(new TerrificExtension(new ContextProvider));

Step 5: Profit!

Usage

{# Includes the component, data object is merged with the context #}
{% component 'Example' { title: 'Inject an Object' } %}

{# Includes the component, data object is injected as a child context #}
{% component 'Example' { title: 'Inject an Object' } only %}

{# Includes the component, object variable data is merged with the context #}
{% set fooComponentData = { title: 'Inject an Object' } %}
{% component 'Example' fooComponentData %}

{# Includes the component with name contained by string variable, data object is merged with the context #}
{% set fooComponentName = 'Example' %}
{% component fooComponentName { title: 'Inject an Object' } %}

{# Includes the component with name contained by string variable, object variable data is merged with the context #}
{% set fooComponentName = 'Example' %}
{% set fooComponentData = { title: 'Inject an Object' } %}
{% component fooComponentName fooComponentData %}

Documentation

Extension

The extension provides terrific extensions to Twig. Currently, the extension provides the ComponentTokenParser.

Token Parser

The token parser contains the parsing step for the component tag. It tokenizes the stream to different nodes (component, data) and an attribute (only).

The functionality is based on the fantastic Twig_TokenParser_Include.

Node

The Node compiles the tokenized tag to PHP. To see some of the output, check the ComponentTest.

Loader

The TerrificLoader loads templates contained inside the given paths. An implementation of TemplateLocatorInterface provides the paths where the loader should search for templates. Recursively loads any directories contained inside the given directories.

Template Information Provider

An implementation of TemplateInformationProviderInterface should return a list of paths where templates live. These should be in the form of ['frontend/components/atoms', 'frontend/components/molecules', 'frontend/components/organisms']. The component directory will be provided by the TerrificLoader (Example/example.[ext]).

Context Provider

This is the tricky part. An implementation of ContextProviderInterface decides which data will be made available to Twig templates. TODO: More on that.

ConfigReader

Reads nitro's config.json and parses essential information such as the component paths and file extension.

Tests

Tests can be run by using the following command:

composer run-scrip tests

CI

This project uses GitHub actions.

Run locally

• Install nektos/act.
• Open terminal, go to project directory.
• Run act -P ubuntu-latest=shivammathur/node:latest as described here.

Credits

• Twig Template Engine
• Terrific
• Terrific Micro
• Terrific Micro Twig
• Nitro

This project is partially sponsored by Namics.