/**
* Maps provided context values from the plugin to the Rules state.
*
* @param ContextProviderInterface $plugin
* The plugin where the context values are extracted.
* @param \Drupal\rules\Engine\RulesStateInterface $state
* The Rules state where the context variables are added.
*/
protected function mapProvidedContext(ContextProviderInterface $plugin, RulesStateInterface $state)
{
$provides = $plugin->getProvidedContextDefinitions();
foreach ($provides as $name => $provided_definition) {
// Avoid name collisions in the rules state: provided variables can be
// renamed.
if (isset($this->configuration['provides_mapping'][$name])) {
$state->addVariable($this->configuration['provides_mapping'][$name], $plugin->getProvidedContext($name));
} else {
$state->addVariable($name, $plugin->getProvidedContext($name));
}
}
}
/**
* {@inheritdoc}
*/
public function process($value, RulesStateInterface $rules_state)
{
$replacements = [];
// The Token API requires this metadata object, but it is useless for us
// here so we just always pass the same instance and ignore it.
$bubbleable_metdata = new BubbleableMetadata();
// We only use the token service to scan for tokens in the text. The
// replacements are done by using the data selector logic.
foreach ($this->tokenService->scan($value) as $var_name => $tokens) {
foreach ($tokens as $token) {
// Remove the opening and closing bracket to form a data selector.
$data_selector = substr($token, 1, -1);
try {
$replacement_data = $rules_state->applyDataSelector($data_selector);
$replacements[$token] = $replacement_data->getString();
} catch (RulesEvaluationException $exception) {
// Data selector is invalid, so try to resolve the token with the
// token service.
if ($rules_state->hasVariable($var_name)) {
$variable = $rules_state->getVariable($var_name);
$token_type = $variable->getContextDefinition()->getDataType();
// The Token system does not know about "enity:" data type prefixes,
// so we have to remove them.
$token_type = str_replace('entity:', '', $token_type);
$data = [$token_type => $variable->getContextValue()];
$replacements += $this->tokenService->generate($token_type, $tokens, $data, ['sanitize' => FALSE], $bubbleable_metdata);
} else {
$replacements += $this->tokenService->generate($var_name, $tokens, [], ['sanitize' => FALSE], $bubbleable_metdata);
}
// Remove tokens if no replacement value is found.
$replacements += array_fill_keys($tokens, '');
}
}
}
// Apply the replacements now.
$tokens = array_keys($replacements);
$values = array_values($replacements);
return str_replace($tokens, $values, $value);
}