[ticket/13717] Set the assets after rendering the whole template

The goal being to be able to call INCLUDECSS/JS from anywhere in any tempalte or event

PHPBB3-13717

phpBB/phpbb/template/assets_bag.php

@@ -0,0 +1,95 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\template;
+
+class assets_bag
+{
+	/** @var asset[] */
+	protected $stylesheets = [];
+
+	/** @var asset[] */
+	protected $scripts = [];
+
+	/**
+	 * Add a css asset to the bag
+	 *
+	 * @param asset $asset
+	 */
+	public function add_stylesheet(asset $asset)
+	{
+		$this->stylesheets[] = $asset;
+	}
+
+	/**
+	 * Add a js script asset to the bag
+	 *
+	 * @param asset $asset
+	 */
+	public function add_script(asset $asset)
+	{
+		$this->scripts[] = $asset;
+	}
+
+	/**
+	 * Returns all css assets
+	 *
+	 * @return asset[]
+	 */
+	public function get_stylesheets()
+	{
+		return $this->stylesheets;
+	}
+
+	/**
+	 * Returns all js assets
+	 *
+	 * @return asset[]
+	 */
+	public function get_scripts()
+	{
+		return $this->scripts;
+	}
+
+	/**
+	 * Returns the HTML code to includes all css assets
+	 *
+	 * @return string
+	 */
+	public function get_stylesheets_content()
+	{
+		$output = '';
+		foreach ($this->stylesheets as $stylesheet)
+		{
+			$output .= "<link href=\"{$stylesheet->get_url()}\" rel=\"stylesheet\" type=\"text/css\" media=\"screen\" />\n";
+		}
+
+		return $output;
+	}
+
+	/**
+	 * Returns the HTML code to includes all js assets
+	 *
+	 * @return string
+	 */
+	public function get_scripts_content()
+	{
+		$output = '';
+		foreach ($this->scripts as $script)
+		{
+			$output .= "<script type=\"text/javascript\" src=\"{$script->get_url()}\"></script>\n";
+		}
+
+		return $output;
+	}
+}