feat(directives): add expressions directive

src/flextype/core/Entries/Directives/ExpressionsDirective.php

@@ -0,0 +1,40 @@
+<?php
+
+declare(strict_types=1);
+
+ /**
+ * Flextype - Hybrid Content Management System with the freedom of a headless CMS 
+ * and with the full functionality of a traditional CMS!
+ * 
+ * Copyright (c) Sergey Romanenko (https://awilum.github.io)
+ *
+ * Licensed under The MIT License.
+ *
+ * For full copyright and license information, please see the LICENSE
+ * Redistributions of files must retain the above copyright notice.
+ */
+
+use Glowy\Arrays\Arrays as Collection;
+
+// Directive: [[  ]]
+emitter()->addListener('onEntriesFetchSingleField', static function (): void {
+
+    if (! registry()->get('flextype.settings.entries.directives.expressions.enabled')) {
+        return;
+    }
+
+    if (! registry()->get('flextype.settings.entries.directives.expressions.enabled_globally')) {
+        return;
+    }
+
+    $field = entries()->registry()->get('methods.fetch.field');
+    
+    if (is_string($field['value'])) {
+        $field['value'] = preg_replace_callback('/\[\[ (.*?) \]\]/s', function($matches) {
+            return expression()->evaluate($matches[1]);
+        }, $field['value']);
+    }
+
+    entries()->registry()->set('methods.fetch.field.key', $field['key']);
+    entries()->registry()->set('methods.fetch.field.value', $field['value']);
+});

src/flextype/settings.yaml

@@ -77,6 +77,10 @@ entries:
   vars:
     debug: false
   directives:
+    expressions:
+      enabled: true
+      enabled_globally: true
+      path: "/src/flextype/core/Entries/Directives/ExpressionsDirective.php"
     shortcodes:
       enabled: true
       enabled_globally: true
@@ -630,6 +634,7 @@ parsers:
       type:
         enabled: true
         path: "/src/flextype/core/Parsers/Shortcodes/TypeShortcode.php" 
+
 # CORS
 #
 # CORS (Cross-origin resource sharing) allows JavaScript web apps to make HTTP requests to other domains.

tests/fixtures/settings/settings.yaml

@@ -73,6 +73,10 @@ entries:
   vars:
     debug: false
   directives:
+    expressions:
+      enabled: true
+      enabled_globally: true
+      path: "/src/flextype/core/Entries/Directives/ExpressionsDirective.php"
     shortcodes:
       enabled: true
       enabled_globally: true

tests/src/flextype/core/Entries/Directives/ExpressionsDirectiveTest.php

@@ -0,0 +1,17 @@
+<?php
+
+use Flextype\Component\Filesystem\Filesystem;
+
+beforeEach(function() {
+    filesystem()->directory(PATH['project'] . '/entries')->create();
+});
+
+afterEach(function (): void {
+    filesystem()->directory(PATH['project'] . '/entries')->delete();
+});
+
+test('expressions directive', function () {
+    entries()->create('expressions', ['test' => '[[ 1+1 ]]']);
+
+    $this->assertEquals(2, entries()->fetch('expressions')['test']);
+});