Event::trigger() - Code Metrics - Inspection of "Avoid processing events before the Event System is..." - splitbrain/dokuwiki - Measure and Improve Code Quality continuously with Scrutinizer

Failed Conditions

Push — psr2-pluginredux ( 89614c )

by Andreas

created 2019-04-20 20:00 UTC

Event::trigger() B

↳ Parent: Event

Complexity

Conditions	6
Paths	9

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	6
nc	9
nop	2
dl	0
loc	27
rs	8.8657
c	0
b	0
f	0

<?php

namespace dokuwiki\Extension;

/**
 * The Action plugin event
 */
class Event
{

    // public properties
    public $name = '';                // READONLY  event name, objects must register against this name to see the event
    public $data = null;              // READWRITE data relevant to the event, no standardised format (YET!)
    public $result = null;            // READWRITE the results of the event action, only relevant in "_AFTER" advise
    //    event handlers may modify this if they are preventing the default action
    //    to provide the after event handlers with event results
    public $canPreventDefault = true; // READONLY  if true, event handlers can prevent the events default action

    // private properties, event handlers can effect these through the provided methods
    protected $_default = true;     // whether or not to carry out the default action associated with the event
    protected $_continue = true;    // whether or not to continue propagating the event to other handlers

    /**
     * event constructor
     *
     * @param string $name
     * @param mixed $data
     */
    public function __construct($name, &$data)
    {

        $this->name = $name;
        $this->data =& $data;

    }

    /**
     * @return string
     */
    public function __toString()
    {
        return $this->name;
    }

    /**
     * advise functions
     *
     * advise all registered handlers of this event
     *
     * if these methods are used by functions outside of this object, they must
     * properly handle correct processing of any default action and issue an
     * advise_after() signal. e.g.
     *    $evt = new dokuwiki\Plugin\Doku_Event(name, data);
     *    if ($evt->advise_before(canPreventDefault) {
     *      // default action code block
     *    }
     *    $evt->advise_after();
     *    unset($evt);
     *
     * @param bool $enablePreventDefault
     * @return bool results of processing the event, usually $this->_default
     */
    public function advise_before($enablePreventDefault = true)
    {
        global $EVENT_HANDLER;

        $this->canPreventDefault = $enablePreventDefault;
        if($EVENT_HANDLER !== null) {
            $EVENT_HANDLER->process_event($this, 'BEFORE');
        } else {
            dbglog($this->name.':BEFORE event triggered before event system was initialized');
        }

        return (!$enablePreventDefault || $this->_default);
    }

    public function advise_after()
    {
        global $EVENT_HANDLER;

        $this->_continue = true;

        if($EVENT_HANDLER !== null) {
            $EVENT_HANDLER->process_event($this, 'AFTER');
        } else {
            dbglog($this->name.':AFTER event triggered before event system was initialized');
        }
    }

    /**
     * trigger
     *
     * - advise all registered (<event>_BEFORE) handlers that this event is about to take place
     * - carry out the default action using $this->data based on $enablePrevent and
     *   $this->_default, all of which may have been modified by the event handlers.
     * - advise all registered (<event>_AFTER) handlers that the event has taken place
     *
     * @param null|callable $action
     * @param bool $enablePrevent
     * @return  mixed $event->results
     *          the value set by any <event>_before or <event> handlers if the default action is prevented
     *          or the results of the default action (as modified by <event>_after handlers)
     *          or NULL no action took place and no handler modified the value
     */
    public function trigger($action = null, $enablePrevent = true)
    {

        if (!is_callable($action)) {
            $enablePrevent = false;
            if (!is_null($action)) {
                trigger_error(
                    'The default action of ' . $this .
                    ' is not null but also not callable. Maybe the method is not public?',
                    E_USER_WARNING
                );
            }
        }

        if ($this->advise_before($enablePrevent) && is_callable($action)) {
            if (is_array($action)) {
                list($obj, $method) = $action;
                $this->result = $obj->$method($this->data);
            } else {
                $this->result = $action($this->data);
            }
        }

        $this->advise_after();

        return $this->result;
    }

    /**
     * stopPropagation
     *
     * stop any further processing of the event by event handlers
     * this function does not prevent the default action taking place
     */
    public function stopPropagation()
    {
        $this->_continue = false;
    }

    /**
     * may the event propagate to the next handler?
     *
     * @return bool
     */
    public function mayPropagate()
    {
        return $this->_continue;
    }

    /**
     * preventDefault
     *
     * prevent the default action taking place
     */
    public function preventDefault()
    {
        $this->_default = false;
    }

    /**
     * should the default action be executed?
     *
     * @return bool
     */
    public function mayRunDefault()
    {
        return $this->_default;
    }

    /**
     * Convenience method to trigger an event
     *
     * Creates, triggers and destroys an event in one go
     *
     * @param  string   $name               name for the event
     * @param  mixed    $data               event data
     * @param  callable $action             (optional, default=NULL) default action, a php callback function
     * @param  bool     $canPreventDefault  (optional, default=true) can hooks prevent the default action
     *
     * @return mixed                        the event results value after all event processing is complete
     *                                      by default this is the return value of the default action however
     *                                      it can be set or modified by event handler hooks
     */
    static public function createAndTrigger($name, &$data, $action=null, $canPreventDefault=true) {
        $evt = new Event($name, $data);
        return $evt->trigger($action, $canPreventDefault);
    }
}


1			<?php
2
3			namespace dokuwiki\Extension;
4
5			/**
6			* The Action plugin event
7			*/
8			class Event
9			{
10
11			// public properties
12			public $name = ''; // READONLY event name, objects must register against this name to see the event
13			public $data = null; // READWRITE data relevant to the event, no standardised format (YET!)
14			public $result = null; // READWRITE the results of the event action, only relevant in "_AFTER" advise
15			// event handlers may modify this if they are preventing the default action
16			// to provide the after event handlers with event results
17			public $canPreventDefault = true; // READONLY if true, event handlers can prevent the events default action
18
19			// private properties, event handlers can effect these through the provided methods
20			protected $_default = true; // whether or not to carry out the default action associated with the event
21			protected $_continue = true; // whether or not to continue propagating the event to other handlers
22
23			/**
24			* event constructor
25			*
26			* @param string $name
27			* @param mixed $data
28			*/
29			public function __construct($name, &$data)
30			{
31
32			$this->name = $name;
33			$this->data =& $data;
34
35			}
36
37			/**
38			* @return string
39			*/
40			public function __toString()
41			{
42			return $this->name;
43			}
44
45			/**
46			* advise functions
47			*
48			* advise all registered handlers of this event
49			*
50			* if these methods are used by functions outside of this object, they must
51			* properly handle correct processing of any default action and issue an
52			* advise_after() signal. e.g.
53			* $evt = new dokuwiki\Plugin\Doku_Event(name, data);
54			* if ($evt->advise_before(canPreventDefault) {
55			* // default action code block
56			* }
57			* $evt->advise_after();
58			* unset($evt);
59			*
60			* @param bool $enablePreventDefault
61			* @return bool results of processing the event, usually $this->_default
62			*/
63			public function advise_before($enablePreventDefault = true)
64			{
65			global $EVENT_HANDLER;
66
67			$this->canPreventDefault = $enablePreventDefault;
68			if($EVENT_HANDLER !== null) {
69			$EVENT_HANDLER->process_event($this, 'BEFORE');
70			} else {
71			dbglog($this->name.':BEFORE event triggered before event system was initialized');
72			}
73
74			return (!$enablePreventDefault \|\| $this->_default);
75			}
76
77			public function advise_after()
78			{
79			global $EVENT_HANDLER;
80
81			$this->_continue = true;
82
83			if($EVENT_HANDLER !== null) {
84			$EVENT_HANDLER->process_event($this, 'AFTER');
85			} else {
86			dbglog($this->name.':AFTER event triggered before event system was initialized');
87			}
88			}
89
90			/**
91			* trigger
92			*
93			* - advise all registered (<event>_BEFORE) handlers that this event is about to take place
94			* - carry out the default action using $this->data based on $enablePrevent and
95			* $this->_default, all of which may have been modified by the event handlers.
96			* - advise all registered (<event>_AFTER) handlers that the event has taken place
97			*
98			* @param null\|callable $action
99			* @param bool $enablePrevent
100			* @return mixed $event->results
101			* the value set by any <event>_before or <event> handlers if the default action is prevented
102			* or the results of the default action (as modified by <event>_after handlers)
103			* or NULL no action took place and no handler modified the value
104			*/
105			public function trigger($action = null, $enablePrevent = true)
106			{
107
108			if (!is_callable($action)) {
109			$enablePrevent = false;
110			if (!is_null($action)) {
111			trigger_error(
112			'The default action of ' . $this .
113			' is not null but also not callable. Maybe the method is not public?',
114			E_USER_WARNING
115			);
116			}
117			}
118
119			if ($this->advise_before($enablePrevent) && is_callable($action)) {
120			if (is_array($action)) {
121			list($obj, $method) = $action;
122			$this->result = $obj->$method($this->data);
123			} else {
124			$this->result = $action($this->data);
125			}
126			}
127
128			$this->advise_after();
129
130			return $this->result;
131			}
132
133			/**
134			* stopPropagation
135			*
136			* stop any further processing of the event by event handlers
137			* this function does not prevent the default action taking place
138			*/
139			public function stopPropagation()
140			{
141			$this->_continue = false;
142			}
143
144			/**
145			* may the event propagate to the next handler?
146			*
147			* @return bool
148			*/
149			public function mayPropagate()
150			{
151			return $this->_continue;
152			}
153
154			/**
155			* preventDefault
156			*
157			* prevent the default action taking place
158			*/
159			public function preventDefault()
160			{
161			$this->_default = false;
162			}
163
164			/**
165			* should the default action be executed?
166			*
167			* @return bool
168			*/
169			public function mayRunDefault()
170			{
171			return $this->_default;
172			}
173
174			/**
175			* Convenience method to trigger an event
176			*
177			* Creates, triggers and destroys an event in one go
178			*
179			* @param string $name name for the event
180			* @param mixed $data event data
181			* @param callable $action (optional, default=NULL) default action, a php callback function
182			* @param bool $canPreventDefault (optional, default=true) can hooks prevent the default action
183			*
184			* @return mixed the event results value after all event processing is complete
185			* by default this is the return value of the default action however
186			* it can be set or modified by event handler hooks
187			*/
188			static public function createAndTrigger($name, &$data, $action=null, $canPreventDefault=true) {
189			$evt = new Event($name, $data);
190			return $evt->trigger($action, $canPreventDefault);
191			}
192			}
193

splitbrain / dokuwiki

Push — psr2-pluginredux ( 89614c )

Event::trigger() B

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