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<?php
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/**
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* @file Contains classes for data processing.
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*
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* Data processors can be used to process element arguments on evaluation time,
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* e.g. to apply input evaluators or to apply simple calculations to number
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* arguments.
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*/
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/**
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* Common base class for Rules data processors.
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*/
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abstract class RulesDataProcessor {
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/**
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* The processors' setting value.
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*/
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protected $setting = NULL;
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/**
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* Allows chaining processors. If set, the next processor to invoke.
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*/
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protected $processor = NULL;
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/**
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* Constructor.
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*/
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protected function __construct($setting, $param_info, $var_info = array(), $processor = NULL) {
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$this->setting = $setting;
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$this->processor = $processor;
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}
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/**
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* Return $this or skip this processor by returning the next processor.
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*/
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protected function getPreparedValue() {
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return isset($this->setting) && array_filter($this->setting) ? $this : $this->processor;
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}
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/**
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* Returns whether the current user has permission to edit this chain of data
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* processors.
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*/
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public function editAccess() {
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return $this->access() && (!isset($this->processor) || $this->processor->editAccess());
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}
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/**
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* Prepares the processor for parameters.
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*
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* It turns the settings into a suiting processor object, which gets invoked
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* on evaluation time.
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*
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* @param $setting
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* The processor settings which are to be prepared.
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* @param $param_info
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* The info about the parameter to prepare the processor for.
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* @param $var_info
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* An array of info about the available variables.
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*/
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public static function prepareSetting(&$setting, $param_info, $var_info = array()) {
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$processor = NULL;
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foreach (self::processors($param_info, FALSE) as $name => $info) {
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if (!empty($setting[$name])) {
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$object = new $info['class']($setting[$name], $param_info, $var_info, $processor);
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$processor = $object->getPreparedValue();
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}
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}
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$setting = $processor;
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}
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/**
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* Attaches the form of applicable data processors.
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*/
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public static function attachForm(&$form, $settings, $param_info, $var_info, $access_check = TRUE) {
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// If $settings is already prepared get the settings from the processors.
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if ($settings instanceof RulesDataProcessor) {
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$settings = $settings->getChainSettings();
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}
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foreach (self::processors($param_info, $access_check) as $name => $info) {
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$settings += array($name => array());
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$form[$name] = call_user_func(array($info['class'], 'form'), $settings[$name], $var_info);
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$form[$name]['#weight'] = $info['weight'];
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}
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}
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/**
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* Returns defined data processors applicable for the given parameter.
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* Optionally also access to the processors is checked.
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*
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* @param $param_info
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* If given, only processors valid for this parameter are returned.
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*/
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public static function processors($param_info = NULL, $access_check = TRUE, $hook = 'data_processor_info') {
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static $items = array();
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if (!isset($items[$hook]['all'])) {
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$items[$hook]['all'] = rules_fetch_data($hook);
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uasort($items[$hook]['all'], array(__CLASS__, '_item_sort'));
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}
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// Data processing isn't supported for multiple types.
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if (isset($param_info) && is_array($param_info['type'])) {
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return array();
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}
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// Filter the items by type.
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if (isset($param_info['type']) && !isset($items[$hook][$param_info['type']])) {
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$items[$hook][$param_info['type']] = array();
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foreach ($items[$hook]['all'] as $name => $info) {
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// Check whether the parameter type matches the supported types.
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$info += array('type' => 'text');
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if (RulesData::typesMatch($param_info, $info, FALSE)) {
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$items[$hook][$param_info['type']][$name] = $info;
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}
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}
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}
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// Apply the access check.
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$return = isset($param_info['type']) ? $items[$hook][$param_info['type']] : $items[$hook]['all'];
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if ($access_check) {
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foreach ($return as $base => $info) {
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if (!call_user_func(array($info['class'], 'access'))) {
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unset($return[$base]);
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}
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}
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}
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return $return;
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}
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public static function _item_sort($a, $b) {
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return $a['weight'] < $b['weight'] ? -1 : ($a['weight'] > $b['weight'] ? 1 : 0);
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}
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/**
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* Gets the settings array for this and all contained chained processors.
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*/
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public function getChainSettings() {
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foreach ($this->unchain() as $name => $processor) {
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$settings[$name] = $processor->getSetting();
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}
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return isset($settings) ? $settings : array();
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}
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/**
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* Returns an array of modules which we depend on.
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*/
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public function dependencies() {
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$used_processor_info = array_intersect_key($this->processors(), $this->unchain());
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$modules = array();
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foreach ($used_processor_info as $name => $info) {
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$modules[] = $info['module'];
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}
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return array_filter($modules);
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}
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/**
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* @return
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* An array of processors keyed by processor name.
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*/
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protected function unchain() {
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$processor = $this;
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while ($processor instanceof RulesDataProcessor) {
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$processors[get_class($processor)] = $processor;
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$processor = $processor->processor;
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}
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// Note: Don't use the static context to call processors() here as we need a
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// late binding to invoke the input evaluators version, if needed.
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$return = array();
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foreach ($this->processors() as $name => $info) {
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if (isset($processors[$info['class']])) {
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$return[$name] = $processors[$info['class']];
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}
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}
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return $return;
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}
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/**
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* Gets the settings of this processor.
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*/
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public function getSetting() {
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return $this->setting;
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}
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/**
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* Processes the value. If $this->processor is set, invoke this processor
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* first so chaining multiple processors is working.
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*
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* @param $value
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* The value to process.
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* @param $info
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* Info about the parameter for which we process the value.
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* @param $state RulesState
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* The rules evaluation state.
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* @param $element RulesPlugin
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* The element for which we process the value.
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* @return
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* The processed value.
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*/
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abstract public function process($value, $info, RulesState $state, RulesPlugin $element);
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/**
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* Return whether the current user has permission to use the processor.
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*/
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public static function access() {
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return TRUE;
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}
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/**
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* Defines the processor form element.
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*
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* @param $settings
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* The settings of the processor.
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* @param $var_info
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* An array of info about the available variables.
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*
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* @return
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* A form element structure.
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*/
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protected static function form($settings, $var_info) {
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return array();
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}
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}
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/**
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* A base processor for use as input evaluators. Input evaluators are not listed
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* in hook_rules_data_processor_info(). Instead they use
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* hook_rules_evaluator_info() and get attached to input forms.
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*/
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abstract class RulesDataInputEvaluator extends RulesDataProcessor {
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/**
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* Overridden to invoke prepare().
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*/
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protected function __construct($setting, $param_info, $var_info = array(), $processor = NULL) {
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$this->setting = TRUE;
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$this->processor = $processor;
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$this->prepare($setting, $var_info, $param_info);
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}
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/**
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* Overridden to generate evaluator $options and invoke evaluate().
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*/
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public function process($value, $info, RulesState $state, RulesPlugin $element, $options = NULL) {
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$options = isset($options) ? $options : $this->getEvaluatorOptions($info, $state, $element);
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$value = isset($this->processor) ? $this->processor->process($value, $info, $state, $element, $options) : $value;
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return $this->evaluate($value, $options, $state);
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}
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/**
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* Generates the evaluator $options.
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*/
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protected function getEvaluatorOptions($info, $state, $element) {
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$cache = rules_get_cache();
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$languages = language_list();
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$info += array(
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'cleaning callback' => isset($cache['data info'][$info['type']]['cleaning callback']) ? $cache['data info'][$info['type']]['cleaning callback'] : FALSE,
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'sanitize' => FALSE,
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);
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$options = array_filter(array(
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'language' => $info['#langcode'] != LANGUAGE_NONE && isset($languages[$info['#langcode']]) ? $languages[$info['#langcode']] : NULL,
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'callback' => $info['cleaning callback'],
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'sanitize' => $info['sanitize'],
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));
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return $options;
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}
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/**
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* Overriden to prepare input evaluator processors. The setting is expected
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* to be the input value to be evaluated later on and is replaced by the
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* suiting processor.
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*/
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public static function prepareSetting(&$setting, $param_info, $var_info = array()) {
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$processor = NULL;
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foreach (self::evaluators($param_info, FALSE) as $name => $info) {
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$object = new $info['class']($setting, $param_info, $var_info, $processor);
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$processor = $object->getPreparedValue();
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}
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$setting = $processor;
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}
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protected function getPreparedValue() {
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return isset($this->setting) ? $this : $this->processor;
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}
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/**
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* Overriden to just attach the help() of evaluators.
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*/
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public static function attachForm(&$form, $settings, $param_info, $var_info, $access_check = TRUE) {
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foreach (self::evaluators($param_info, $access_check) as $name => $info) {
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$form['help'][$name] = call_user_func(array($info['class'], 'help'), $var_info, $param_info);
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$form['help'][$name]['#weight'] = $info['weight'];
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}
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}
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/**
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* Returns all input evaluators that can be applied to the parameters needed
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* type.
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*/
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public static function evaluators($param_info = NULL, $access_check = TRUE) {
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return parent::processors($param_info, $access_check, 'evaluator_info');
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}
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/**
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* Overridden to default to our hook, thus being equivalent to
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* self::evaluators().
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*/
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public static function processors($param_info = NULL, $access_check = TRUE, $hook = 'evaluator_info') {
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return parent::processors($param_info, $access_check, $hook);
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}
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/**
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* Prepares the evalution, e.g. to determine whether the input evaluator has
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* been used. If this evaluator should be skipped just unset $this->setting.
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*
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* @param $text
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* The text to evaluate later on.
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* @param $variables
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* An array of info about available variables.
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* @param $param_info
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* (optional) An array of information about the handled parameter value.
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* For backward compatibility, this parameter is not required.
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*/
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abstract public function prepare($text, $variables);
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/**
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* Apply the input evaluator.
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*
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* @param $text
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* The text to evaluate.
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* @param $options
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* A keyed array of settings and flags to control the processing.
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* Supported options are:
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* - language: A language object to be used when processing.
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* - callback: A callback function that will be used to post-process
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* replacements that might be incorporated, so they can be cleaned in a
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* certain way.
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* - sanitize: A boolean flag indicating whether incorporated replacements
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* should be sanitized.
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* @param RulesState
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* The rules evaluation state.
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*
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* @return
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* The evaluated text.
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*/
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abstract public function evaluate($text, $options, RulesState $state);
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/**
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* Provide some usage help for the evaluator.
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*
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* @param $variables
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* An array of info about available variables.
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* @param $param_info
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* (optional) An array of information about the handled parameter value.
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* For backward compatibility, this parameter is not required.
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*
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* @return
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* A renderable array.
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*/
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public static function help($variables) {
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return array();
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}
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}
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