[Pmwiki-users] Hook object

[Christian Ridderström]

Hi

I decided to implement hooks using a class object instead, using a 
class I call 'Hook'. In the beginning of my config.php I now do this:

	$customHook = new Hook();
	$customHook->add('addCurrentGroupToSearchBox');

and then after including stdconfig.php I run the hook like this:

	$customHook->run();

/Christian


PS. Here's the implementation.

/** Class: Hook                                                                 
Implements a 'hook', i.e. the user can 'append' or 'prepend' names of
functions to a list, and then a at a later time 'run the hook'.

!!Usage

Create a hook object like this:

	$customHook = new Hook(); // Create a Hook object

Then append a function called 'helloWorld' like this:

	$customHook->append('helloWorld');

as an alias for @@append()@@, you can also use @@add()@@. To prepend a
function to the hook use @@prepend()@@ instead. Finally, the hook is
run like this:

	$customHook->run();

!!Tip

The function @@create_function()@@ is useful to create temporary
functions, e.g. like this:
	$customHook->add(create_function('', 'echo "Hello World\n";'));

*/
 class Hook {
  var $hooks_;
  function Hook() { $this->hooks_ = array(); }
  function hooks(){ return $this->$hooks_; }
  function append($fcn){ array_push($this->hooks_, $fcn); }
  function prepend($fcn){ array_splice($this->hooks_,0,0,array($fcn)); }
  function add($fcn){ $this->append($fcn); }
  function run(){
    array_map('call_user_func',
              array_filter($this->hooks_, 'function_exists'));
  }
  function show(){
    echo "<pre>hooks_=\n";
    foreach($this->hooks_ as $k=>$v)
      printf("%s => '%s'\n", $k, $v[0] == "\0" ? "\\0".substr($v, 1) : $v);
    echo "</pre>";
  }
}

-- 
Christian Ridderstr?m                           http://www.md.kth.se/~chr