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devel:overview
Core Overview
This is a walk through the source code during a request for /doku.php?id=start&do=show to explain the basics of DokuWiki. You should have the full source available when reading this to fully enjoy this journey. Use the XRef links to obtain a browsable version of the source. There is also a more detailed callgraph page available including the rendering process. A lot of detail is left out of this description to make it simpler.
| Filename | Code snippet | Description |
|---|---|---|
| doku.php | if(!defined('DOKU_INC')) | Everything starts here by defining the base code directory |
$ACT = $_REQUEST['do'] | next we determine which action is requested a.k.a. do modes | |
require_once('init.php') | over to init.php, initialize core | |
| inc/init.php | include('preload.php') | preload make it possible to override directories and configuration cascade |
if(!defined('DOKU_CONF') | create environment defines for code location | |
include(DOKU_INC. 'inc/config_cascade.php') | prepare and load the global configuration file(s) | |
global $lang; | load and prepare the language files using English for all missing entries | |
if(!defined('DOKU_REL') | create all environment defines not already defined, which might be dependent of the config settings | |
if(!headers_sent() && .. | init session and set cookie | |
require_once (DOKU_INC.'inc/load.php') | autoload all libraries | |
… | initialize plugin controller, event handling system, authentication and exit after setting up mail | |
| doku.php | $ID = getID() | back from init.php, sanitize and turn request into global variables |
$INFO = pageinfo() | add page metadata into a global variable, this includes calling auth_quickaclcheck() and p_get_metadata(). The later causing a rendering of page metadata if it isn't cached. | |
if(!$INFO['exists'] … | send 404 for missing pages | |
trigger_event(DOKUWIKI_STARTED) | call action plugins subscribing the DOKUWIKI_STARTED event | |
| inc/actions.php | act_dispatch($ACT) | do the work depending on action |
if ($evt->advise_before()) ... | allow plugins to override default behavior using ACTION_ACT_PREPROCESS event | |
$ACT = act_clean($ACT) | sanitize and redirect disabled actions into do=show |
|
… | call processing code for requested action(s) while checking needed ACL permissions. The $ACT might change during act_dispatch(). | |
global $INFO | make global variables accessible to template code | |
trigger_event(ACTION_HEADERS_SEND) | call action plugins subscribing the ACTION_HEADERS_SEND event | |
include(template('main.php')) | over to the selected template main script | |
| lib/tpl/default/main.php | … | the template main script consist of HTML design elements calling on php methods for content like metaheaders, buttons, breadcrumb navigation elements etc. all available in the inc/template.php file |
tpl_content() | here the actual wiki page is created | |
| inc/template.php | ||
trigger_event(TPL_ACT_RENDER) | call to tpl_content_core() using TPL_ACT_RENDER event | |
switch($ACT) | select content based on action, the basic do=show calls html_show() |
|
| inc/html.php | $html = p_wiki_xhtml(…) | which uses a cached XHTML version of the page OR triggers the renderer to render cached instructions as XHTML OR use the parser to turn wiki text into instructions first. |
| inc/template.php | trigger_event(TPL_CONTENT_DISPLAY) | back in tpl_content() action plugin's have a last chance to edit raw HTML before output by using TPL_CONTENT_DISPLAY event |
| doku.php | trigger_event(DOKUWIKI_DONE) | finish by calling action plugins subscribing the DOKUWIKI_DONE event when the template main script has ended |
devel/overview.txt · Last modified: 2016-11-03 02:20 by ach
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