support plugin

nexus/Plugin/Hook.php

@@ -0,0 +1,71 @@
+<?php
+
+namespace Nexus\Plugin;
+
+class Hook
+{
+    private static array $callbacks = [];
+
+    public function addFilter($name, $function, $priority, $argc)
+    {
+        $id = $this->buildUniqueId($function);
+        $isPriorityExists = isset(self::$callbacks[$priority]);
+        self::$callbacks[$name][$priority][$id] = ['function' => $function, 'argc' => $argc];
+        if (!$isPriorityExists && count(self::$callbacks) > 1) {
+            krsort(self::$callbacks, SORT_NUMERIC);
+        }
+    }
+
+    private function buildUniqueId($function): string
+    {
+        if (is_string($function)) {
+            return $function;
+        } elseif (is_object($function) && ($function instanceof \Closure)) {
+            //Closure
+            return spl_object_hash($function);
+        } elseif (is_array($function)) {
+            if (is_object($function[0])) {
+                return spl_object_hash($function[0]).$function[1];
+            } elseif (is_string($function[0])) {
+                return $function[0].'::'.$function[1];
+            }
+        }
+        throw new \InvalidArgumentException("Invalid function, type: " . gettype($function));
+    }
+
+    public function applyFilter($name, $value = '')
+    {
+        if (!isset(self::$callbacks[$name])) {
+            do_log("No this hook: $name");
+            return null;
+        }
+        $args = func_get_args();
+        reset(self::$callbacks[$name]);
+        do_log("name: $name, args: " . json_encode($args));
+        do {
+            foreach ((array)current(self::$callbacks[$name]) as $callback) {
+                $args[1] = $value;
+                $value = call_user_func_array($callback['function'], array_slice($args, 1, $callback['argc']));
+            }
+        }
+        while (next(self::$callbacks[$name]) !== false);
+        return $value;
+    }
+
+    public function addAction($name, $function, $priority, $argc)
+    {
+        return $this->addFilter($name, $function, $priority, $argc);
+    }
+
+    public function doAction($name, ...$args)
+    {
+        $this->applyFilter(...func_get_args());
+    }
+
+    public function dump()
+    {
+        echo '<pre>';
+        var_dump(self::$callbacks);
+        echo '</pre>';
+    }
+}