- First commit of first draft

src/ControlStructure/SectionToken.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace Picea\ControlStructure;
+
+class SectionToken implements ControlStructure {
+
+    public string $token = "section";
+
+    public function parse(/*\Picae\Compiler\Context*/ &$context, ?string $arguments) {
+        list($name, $options) = array_pad(explode(',', $arguments), 2, null);
+
+        if ( $options ?? false ) {
+            $options = eval($options);
+        }
+
+        if ( ! ctype_alnum(str_replace([".", "\"", "'"], "", $name)) ) {
+            throw new \RuntimeException("Your section named `{$name}` contains invalid character. Allowed are only letters, numbers and dots");
+        }
+
+        $context->sections[] = [
+            'name' => $name,
+            'options' => $options,
+        ];
+
+        $action = $options['action'] ?? "default";
+
+        if (! in_array($action, ['prepend', 'append', 'default'])) {
+            throw new \RuntimeException("An unsupported action `$action` was given as an option of a {% section %} tag");
+        }
+
+        $order = $options['order'] ?? "count(\$this->__section_list[$name]['$action'])";
+
+        return "<?php \$this->__section_list[$name] ??= [ 'prepend' => [], 'append' => [], 'default' => [] ];
+                      \$this->__section_list[$name]['$action'][] = [ 'order' => $order, 'callback' => function() {
+                          extract(\$this->__variables_list); ?>";
+    }
+}