egroupware/etemplate/inc/class.etemplate_widget_transformer.inc.php
2012-04-24 19:44:50 +00:00

233 lines
7.8 KiB
PHP

<?php
/**
* EGroupware - eTemplate serverside base widget, to define new widgets using a transformation out of existing widgets
*
* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
* @package etemplate
* @subpackage api
* @link http://www.egroupware.org
* @author Ralf Becker <RalfBecker@outdoor-training.de>
* @copyright 2002-11 by RalfBecker@outdoor-training.de
* @version $Id$
*/
/**
* eTemplate serverside base widget, to define new widgets using a transformation out of existing widgets
*/
abstract class etemplate_widget_transformer extends etemplate_widget
{
/**
* Array with a transformation description, based on attributes to modify.
*
* Exampels:
*
* * 'type' => array('some' => 'other')
* if 'type' attribute equals 'some' replace it with 'other'
*
* * 'type' => array('some' => array('type' => 'other', 'options' => 'otheroption')
* same as above, but additonally set 'options' attr to 'otheroption'
*
* --> leaf element is the action, if previous filters are matched:
* - if leaf is scalar, it just replaces the previous filter value
* - if leaf is an array, it contains assignments for (multiple) attributes: attr => value pairs
*
* * 'type' => array(
* 'some' => array(...),
* 'other' => array(...),
* '__default__' => array(...),
* )
* it's possible to have a list of filters with actions to run, plus a '__default__' which matches all not explicitly named values
*
* * 'value' => array('__callback__' => 'app.class.method' || 'class::method' || 'method')
* run value through a *serverside* callback, eg. reading an entry based on it's given id
* callback signature: mixed function(mixed $attr[, array $attrs])
*
* * 'value' => array('__js__' => 'function(value) { return value+5; }')
* run value through a *clientside* callback running in the context of the widget
*
* * 'name' => '@name[@options]'
* replace value of 'name' attribute with itself (@name) plus value of options in square brackets
* * 'value' => '@value[@options]'
* replace value array with value for key taken from value of options attribute
*
* --> attribute name prefixed with @ sign means value of given attribute
*
* @var array
*/
protected static $transformation = array();
/**
* Switching debug messages to error_log on/off
*
* @var boolean
*/
const DEBUG = false;
/**
* Rendering transformer widget serverside as an old etemplate extension
*
* This function is called before the extension gets rendered
*
* @param string $name form-name of the control
* @param mixed &$value value / existing content, can be modified
* @param array &$cell array with the widget, can be modified for ui-independent widgets
* @param array &$readonlys names of widgets as key, to be made readonly
* @param mixed &$extension_data data the extension can store persisten between pre- and post-process
* @param etemplate &$tmpl reference to the template we belong too
* @return boolean true if extra label is allowed, false otherwise
*/
function pre_process($name,&$value,&$cell,&$readonlys,&$extension_data,&$tmpl)
{
$cell['value'] =& $value;
$cell['options'] =& $cell['size']; // old engine uses 'size' instead of 'options' for legacy options
$cell['id'] =& $cell['name']; // dto for 'name' instead of 'id'
// run the transformation
foreach($this->transformation as $filter => $data)
{
$this->action($filter, $data, $cell);
}
return true;
}
/**
* Fill type options in self::$request->sel_options to be used on the client
*
* @param string $cname
*/
public function beforeSendToClient($cname)
{
$attrs = $this->attrs;
$form_name = self::form_name($cname, $this->id);
if (empty($this->id))
{
error_log(__METHOD__."() $this has no id!");
return;
}
$attrs['value'] = $value =& self::get_array(self::$request->content, $form_name);
$attrs['type'] = $this->type;
$attrs['id'] = $this->id;
$unmodified = $attrs;
// run the transformation
foreach(static::$transformation as $filter => $data)
{
$this->action($filter, $data, $attrs);
}
//echo $this; _debug_array($unmodified); _debug_array($attrs); _debug_array(array_diff_assoc($attrs, $unmodified));
// compute the difference and send it to the client as modifications
foreach(array_diff_assoc($attrs, $unmodified) as $attr => $val)
{
switch($attr)
{
case 'value':
if ($val != $value)
{
$value = $val; // $value is reference to self::$request->content
}
break;
case 'sel_options':
self::$request->sel_options[$form_name] = $val;
break;
case 'type': // not an attribute in etemplate2
default:
self::setElementAttribute($form_name, $attr, $val);
break;
}
}
}
/**
* Recursively run given action(s) on an attribute value
*
* @param string $attr attribute concerned
* @param int|string|array $action action to run
* @param array &$attrs attributes
* @throws egw_exception_wrong_parameter if $action is of wrong type
*/
function action($attr, $action, array &$attrs)
{
if (self::DEBUG) error_log(__METHOD__."('$attr', ".array2string($action).')');
// action is an assignment
if (is_scalar($action) || is_null($action))
{
// check if assignment contains placeholders --> replace them
if (strpos($action, '@') !== false)
{
$replace = array();
foreach($attrs as $a => $v)
{
if (is_scalar($v) || is_null($v)) $replace['@'.$a] = $v;
}
$action = strtr($action, $replace);
// now replace with non-scalar value, eg. if values is an array: "@value", "@value[key] or "@value[@key]"
if (($a = strstr($action, '@')))
{
$action = self::get_array($attrs, substr($a,1));
}
}
$attrs[$attr] = $action;
if (self::DEBUG) error_log(__METHOD__."('$attr', ".array2string($action).") attrs['$attr'] = ".array2string($action).', attrs='.array2string($attrs));
}
// action is a serverside callback
elseif(is_array($action) && isset($action['__callback__']))
{
if (!is_string(($callback = $action['__callback__'])))
{
throw new egw_exception_wrong_parameter(__METHOD__."('$attr', ".array2string($action).', '.array2string($attrs).') wrong datatype for callback!');
}
if (method_exists($this, $callback))
{
$attrs[$attr] = $this->$callback($attrs[$attr], $attrs);
}
elseif(count(explode('.', $callback)) == 3)
{
$attrs[$attr] = ExecMethod($callback, $attrs[$attr], $attrs);
}
elseif (is_callable($callback, false))
{
$attrs[$attr] = call_user_func($callback, $attrs[$attr], $attrs);
}
else
{
throw new egw_exception_wrong_parameter(__METHOD__."('$attr', ".array2string($action).', '.array2string($attrs).') wrong datatype for callback!');
}
}
// action is a clientside callback
elseif(is_array($action) && isset($action['__js__']))
{
// nothing to do here
}
// TODO: Might be a better way to handle when value to be set is an array
elseif(is_array($action) && $attr == 'sel_options')
{
$attrs[$attr] = $action;
}
// action is a switch --> check cases
elseif(is_array($action))
{
// case matches --> run all actions
if (isset($action[$attrs[$attr]]) || !isset($action[$attrs[$attr]]) && isset($action['__default__']))
{
$actions = isset($action[$attrs[$attr]]) ? $action[$attrs[$attr]] : $action['__default__'];
if(!is_array($actions))
{
$attrs[$attr] = $actions;
$actions = array($attr => $actions);
}
if (self::DEBUG) error_log(__METHOD__."(attr='$attr', action=".array2string($action).") attrs['$attr']=='{$attrs[$attr]}' --> running actions");
foreach($actions as $attr => $action)
{
$this->action($attr, $action, $attrs);
}
}
}
else
{
throw new egw_exception_wrong_parameter(__METHOD__."(attr='$attr', action=".array2string($action).', attrs='.array2string($attrs).') wrong datatype for action!');
}
}
}