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<?php
/**
* Hooks.php -- a tool for running hook functions
* Copyright 2004, 2005 Evan Prodromou <evan@wikitravel.org>.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* @author Evan Prodromou <evan@wikitravel.org>
* @package MediaWiki
* @see hooks.txt
*/
if (defined('MEDIAWIKI')) {
/**
* Because programmers assign to $wgHooks, we need to be very
* careful about its contents. So, there's a lot more error-checking
* in here than would normally be necessary.
*/
function wfRunHooks($event, $args = null) {
global $wgHooks;
if (!is_array($wgHooks)) {
wfDebugDieBacktrace("Global hooks array is not an array!\n");
return false;
}
if (!array_key_exists($event, $wgHooks)) {
return true;
}
if (!is_array($wgHooks[$event])) {
wfDebugDieBacktrace("Hooks array for event '$event' is not an array!\n");
return false;
}
foreach ($wgHooks[$event] as $hook) {
$object = NULL;
$method = NULL;
$func = NULL;
$data = NULL;
$have_data = false;
/* $hook can be: a function, an object, an array of $function and $data,
* an array of just a function, an array of object and method, or an
* array of object, method, and data.
*/
if (is_array($hook)) {
if (count($hook) < 1) {
wfDebugDieBacktrace("Empty array in hooks for " . $event . "\n");
} else if (is_object($hook[0])) {
$object = $hook[0];
if (count($hook) < 2) {
$method = "on" . $event;
} else {
$method = $hook[1];
if (count($hook) > 2) {
$data = $hook[2];
$have_data = true;
}
}
} else if (is_string($hook[0])) {
$func = $hook[0];
if (count($hook) > 1) {
$data = $hook[1];
$have_data = true;
}
} else {
wfDebugDieBacktrace("Unknown datatype in hooks for " . $event . "\n");
}
} else if (is_string($hook)) { # functions look like strings, too
$func = $hook;
} else if (is_object($hook)) {
$object = $hook;
$method = "on" . $event;
} else {
wfDebugDieBacktrace("Unknown datatype in hooks for " . $event . "\n");
}
/* We put the first data element on, if needed. */
if ($have_data) {
$hook_args = array_merge(array($data), $args);
} else {
$hook_args = $args;
}
/* Call the hook. */
if ($object) {
$retval = call_user_func_array(array($object, $method), $hook_args);
} else {
$retval = call_user_func_array($func, $hook_args);
}
/* String return is an error; false return means stop processing. */
if (is_string($retval)) {
global $wgOut;
$wgOut->fatalError($retval);
return false;
} else if (!$retval) {
return false;
}
}
return true;
}
} /* if defined(MEDIAWIKI) */
?>
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