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