combo/action/snippets.php

<?php

use ComboStrap\DokuPath;
use ComboStrap\LogUtility;
use ComboStrap\PluginUtility;
use ComboStrap\Resources;
use ComboStrap\Site;
use dokuwiki\Cache\CacheRenderer;

if (!defined('DOKU_INC')) die();

/**
 *
 *
 * Add the snippet needed by the components
 *
 */
class action_plugin_combo_snippets extends DokuWiki_Action_Plugin
{

    const COMBO_CACHE_PREFIX = "combo:cache:";

    /**
     * @var bool - to trace if the header output was called
     */
    private $headerOutputWasCalled = false;

    function __construct()
    {
        // enable direct access to language strings
        // ie $this->lang
        $this->setupLocale();
    }

    public function register(Doku_Event_Handler $controller)
    {

        /**
         * To add the snippets in the header
         */
        $controller->register_hook('TPL_METAHEADER_OUTPUT', 'BEFORE', $this, 'componentSnippetHead', array());

        /**
         * To add the snippets in the content
         * if they have not been added to the header
         *
         * Not https://www.dokuwiki.org/devel:event:tpl_content_display TPL_ACT_RENDER
         * or https://www.dokuwiki.org/devel:event:tpl_act_render
         * because it works only for the main content
         * in {@link tpl_content()}
         *
         * We use
         * https://www.dokuwiki.org/devel:event:renderer_content_postprocess
         * that is in {@link p_render()} and takes into account also the slot page.
         */
        $controller->register_hook('RENDERER_CONTENT_POSTPROCESS', 'AFTER', $this, 'componentSnippetContent', array());

        /**
         * To reset the value
         */
        $controller->register_hook('DOKUWIKI_DONE', 'BEFORE', $this, 'close', array());


        /**
         * To log the cache used by bar
         */
        $controller->register_hook('PARSER_CACHE_USE', 'AFTER', $this, 'barParsed', array());

    }

    /**
     * Reset variable
     * Otherwise in test, when we call it two times, it just fail
     */
    function close()
    {

        $this->headerOutputWasCalled = false;

        /**
         * Fighting the fact that in 7.2,
         * there is still a cache
         */
        PluginUtility::initSnippetManager();

    }

    /**
     * Dokuwiki has already a canonical methodology
     * https://www.dokuwiki.org/canonical
     *
     * @param $event
     */
    function componentSnippetHead($event)
    {


        global $ID;
        if (empty($ID)) {

            global $_SERVER;
            $scriptName = $_SERVER['SCRIPT_NAME'];

            /**
             * If this is an ajax call, return
             * only if this not from webcode
             */
            if (strpos($scriptName, "/lib/exe/ajax.php") !== false) {
                global $_REQUEST;
                $call = $_REQUEST['call'];
                if ($call != action_plugin_combo_webcode::CALL_ID) {
                    return;
                }
            } else if (!(strpos($scriptName, "/lib/exe/detail.php") !== false)) {
                /**
                 * Image page has an header and footer that may needs snippet
                 * We return only if this is not a image/detail page
                 */
                return;
            }
        }

        /**
         * Advertise that the header output was called
         * If the user is using another template
         * than strap that does not put the component snippet
         * in the head
         * Used in
         */
        $this->headerOutputWasCalled = true;

        $snippetManager = PluginUtility::getSnippetManager();

        /**
         * For each processed bar in the page
         *   * retrieve the snippets from the cache or store the process one
         *   * add the cache information in meta
         */
        $bars = $snippetManager->getBarsOfPage();
        foreach ($bars as $barId => $servedFromCache) {

            // Add cache information into the head meta
            // to test
            $event->data["meta"][] = array("name" => self::COMBO_CACHE_PREFIX . $barId, "content" => var_export($servedFromCache, true));

            // Get or store the data
            $cache = new \dokuwiki\Cache\Cache($barId, "snippet");
            $barFileSystemPath = DokuPath::createPagePathFromPath(DokuPath::PATH_SEPARATOR . $barId)->getFileSystemPath();
            $dependencies = array(
                "files" => [
                    $barFileSystemPath,
                    Resources::getComboHome() . "/plugin.info.txt"
                ]
            );

            // if the bar was served from the cache
            if ($servedFromCache && $cache->useCache($dependencies)) {

                // Retrieve snippets from previous run
                $data = $cache->retrieveCache();

                if (!empty($data)) {
                    $snippets = unserialize($data);
                    $snippetManager->addSnippetsFromCacheForBar($barId, $snippets);

                    if (Site::debugIsOn()) {
                        LogUtility::log2file("Snippet cache file {$cache->cache} used", LogUtility::LVL_MSG_DEBUG);
                        $event->data['script'][] = array(
                            "type" => "application/json",
                            "_data" => json_encode($snippets),
                            "class" => "combo-snippet-cache-" . str_replace(":", "-", $barId));
                    }

                }
            } else {
                $snippets = $snippetManager->getSnippetsForBar($barId);
                if (!empty($snippets)) {
                    $cache->storeCache(serialize($snippets));
                }
            }

        }

        /**
         * Snippets
         */
        foreach ($snippetManager->getSnippets() as $tagType => $tags) {

            foreach ($tags as $tag) {
                $event->data[$tagType][] = $tag;
            }

        }


        $snippetManager->close();

    }

    /**
     * Used if the template does not run the content
     * before the calling of the header as strap does.
     *
     * In this case, the {@link \ComboStrap\SnippetManager::close()} has
     * not run, and the snippets are still in memory.
     *
     * We store them in the HTML and they
     * follows then the HTML cache of DokuWiki
     * @param $event
     */
    function componentSnippetContent($event)
    {

        $format = $event->data[0];
        if ($format !== "xhtml") {
            return;
        }

        /**
         * Run only if the header output was already called
         */
        if ($this->headerOutputWasCalled) {

            $snippetManager = PluginUtility::getSnippetManager();

            $xhtmlContent = &$event->data[1];
            $snippets = $snippetManager->getSnippets();
            foreach ($snippets as $tagType => $tags) {

                foreach ($tags as $tag) {
                    $xhtmlContent .= DOKU_LF . "<$tagType";
                    $attributes = "";
                    $content = null;
                    foreach ($tag as $attributeName => $attributeValue) {
                        if ($attributeName != "_data") {
                            $attributes .= " $attributeName=\"$attributeValue\"";
                        } else {
                            $content = $attributeValue;
                        }
                    }
                    $xhtmlContent .= "$attributes>";
                    if (!empty($content)) {
                        $xhtmlContent .= $content;
                    }
                    $xhtmlContent .= "</$tagType>" . DOKU_LF;
                }

            }

            $snippetManager->close();

        }

    }


    /**
     *
     * @param $event
     */
    function barParsed($event)
    {
        $data = $event->data;
        if ($data->mode == "xhtml") {

            /* @var CacheRenderer $data */
            $pageId = $data->page;
            $cached = $event->result;
            PluginUtility::getSnippetManager()->addBar($pageId, $cached);

        }


    }


}