attempt to get function to use attributes in Drupal

.gitignore

@@ -7,3 +7,5 @@ pattern-lab
 # NPM
 node_modules
 npm-debug.log
+
+.DS_Store

components/_patterns/01-atoms/02-text/00-headings/heading-1/heading-1.twig

@@ -10,9 +10,8 @@
  * - heading_link_blockname - override the link block name
  */
 #}
-{% set heading_base_class_var = heading_base_class|default('heading-1') %}
 
-<h1 class="{{ heading_base_class_var }}{% for modifier in heading_modifiers %} {{ heading_base_class_var }}--{{ modifier }}{% endfor %}{% if heading_blockname %} {{ heading_blockname }}__{{ heading_base_class_var }}{% endif %}">
+<h1{{ bem('heading-1', (heading_1_modifiers), heading_1_blockname)|raw }}>
   {% if heading_url %}
     {% include "@atoms/01-links/link/link.twig"
       with {

components/_patterns/02-molecules/_block.twig

@@ -25,7 +25,7 @@
  * @see template_preprocess_block()
  */
 #}
-<div{{ attributes }}>
+<div{{ bem('block') }}>
   {{ title_prefix }}
   {% if label %}
     <h2{{ title_attributes.addClass('heading-2') }}>{{ label }}</h2>

components/_twig-components/filters/clean_class.filter.php → components/_twig-components/filters/d_clean_class.filter.php

@@ -6,6 +6,8 @@
  * Bring Drupal filters in just so Pattern Lab doesn't bork.
  */
 
-$filter = new Twig_SimpleFilter('clean_class', function ($string) {
-  return $string;
-});
+if (!class_exists('Drupal')) {
+  $filter = new Twig_SimpleFilter('clean_class', function ($string) {
+    return $string;
+  });
+}

components/_twig-components/filters/safe_join.filter.php → components/_twig-components/filters/d_safe_join.filter.php

@@ -6,6 +6,8 @@
  * Bring Drupal filters in just so Pattern Lab doesn't bork.
  */
 
-$filter = new Twig_SimpleFilter('safe_join', function ($string) {
-  return $string;
-});
+if (!class_exists('Drupal')) {
+  $filter = new Twig_SimpleFilter('safe_join', function ($string) {
+    return $string;
+  });
+}

components/_twig-components/filters/d_t.filter.php

@@ -0,0 +1,19 @@
+<?php
+/**
+ * @file
+ * Add "t" filter for Pattern Lab.
+ *
+ * Bring Drupal filters in just so Pattern Lab doesn't bork.
+ */
+
+if (!class_exists('Drupal')) {
+  $filter = new Twig_SimpleFilter('t', function ($string, $array = array()) {
+    if (is_string($string) && is_array($array)) {
+      $haystack = $string;
+      foreach ($array as $needle => $replace) {
+        $haystack = str_replace($needle, $replace, $haystack);
+      }
+      return $haystack;
+    }
+  });
+}

components/_twig-components/filters/without.filter.php → components/_twig-components/filters/d_without.filter.php

@@ -6,6 +6,8 @@
  * Bring Drupal filters in just so Pattern Lab doesn't bork.
  */
 
-$filter = new Twig_SimpleFilter('without', function ($string) {
-  return $string;
-});
+if (!class_exists('Drupal')) {
+  $filter = new Twig_SimpleFilter('without', function ($string) {
+    return $string;
+  });
+}

components/_twig-components/functions/bem.function.php

@@ -0,0 +1,44 @@
+<?php
+/**
+ * @file
+ * Add "bem" function for Pattern Lab & Drupal
+ */
+
+$function = new Twig_SimpleFunction('bem', function ($base_class, $modifiers = array(), $blockname = '') {
+  $classes = array();
+  // If using a blockname to override default class.
+  if ($blockname) {
+    // Set blockname class.
+    $classes[] = $blockname . '__' . $base_class;
+    // Set blockname--modifier classes for each modifier.
+    if (isset($modifiers) && is_array($modifiers)) {
+      foreach ($modifiers as $modifier) {
+        $classes[] = $blockname . '__' . $base_class . '--' . $modifier;
+      };
+    }
+  }
+  // If not overriding base class.
+  else {
+    // Set base class.
+    $classes[] = $base_class;
+    // Set base--modifier class for each modifier
+    if (isset($modifiers) && is_array($modifiers)) {
+      foreach ($modifiers as $modifier) {
+        $classes[] = $base_class . '--' . $modifier;
+      };
+    }
+  }
+
+  if (class_exists('Drupal')) {
+    $classLoader = new ClassLoader();
+    $classLoader.loadClass("Attribute");
+    $attributes = new Attribute();
+    $attributes['class'][] = $classes;
+  }
+  else {
+    $classString = implode(' ', $classes);
+    $classesSafe = ' class="' . $classString . '"';
+    return $classesSafe;
+  }
+
+});

components/_twig-components/functions/d_kint.function.php

@@ -0,0 +1,11 @@
+<?php
+/**
+ * @file
+ * Add "kint" function for Pattern Lab.
+ */
+
+if (!class_exists('Drupal')) {
+  $function = new Twig_SimpleFunction('kint', function ($string) {
+    return $string;
+  });
+}

components/_twig-components/functions/d_link.function.php

@@ -0,0 +1,11 @@
+<?php
+/**
+ * @file
+ * Add "link" function for Pattern Lab.
+ */
+
+if (!class_exists('Drupal')) {
+  $function = new Twig_SimpleFunction('link', function ($string) {
+    return $string;
+  });
+}

templates/content/page-title.html.twig

@@ -18,6 +18,9 @@
   {% include "@atoms/02-text/00-headings/heading-1/heading-1.twig"
     with {
       "heading": title,
+      "heading_1_modifiers": {
+        1: "drupal-test"
+      }
     }
   %}
 {% endif %}