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<?php
namespace Drupal\Component\Serialization;
use Drupal\Component\Serialization\Exception\InvalidDataTypeException;
/**
* Provides default serialization for YAML using the PECL extension.
*/
class YamlPecl implements SerializationInterface {
/**
* {@inheritdoc}
*/
public static function encode($data) {
static $init;
if (!isset($init)) {
ini_set('yaml.output_indent', 2);
// Do not break lines at 80 characters.
ini_set('yaml.output_width', -1);
$init = TRUE;
}
return yaml_emit($data, YAML_UTF8_ENCODING, YAML_LN_BREAK);
}
/**
* {@inheritdoc}
*/
public static function decode($raw) {
// yaml_parse() will error with an empty value.
if (!trim($raw)) {
return NULL;
}
// @todo Use ErrorExceptions when https://drupal.org/node/1247666 is in.
// yaml_parse() will throw errors instead of raising an exception. Until
// such time as Drupal supports native PHP ErrorExceptions as the error
// handler, we need to temporarily set the error handler as ::errorHandler()
// and then restore it after decoding has occurred. This allows us to turn
// parsing errors into a throwable exception.
// @see Drupal\Component\Serialization\Exception\InvalidDataTypeException
// @see http://php.net/manual/en/class.errorexception.php
set_error_handler([__CLASS__, 'errorHandler']);
$ndocs = 0;
$data = yaml_parse($raw, 0, $ndocs, [
YAML_BOOL_TAG => '\Drupal\Component\Serialization\YamlPecl::applyBooleanCallbacks',
]);
restore_error_handler();
return $data;
}
/**
* Handles errors for \Drupal\Component\Serialization\YamlPecl::decode().
*
* @param int $severity
* The severity level of the error.
* @param string $message
* The error message to display.
*
* @see \Drupal\Component\Serialization\YamlPecl::decode()
*/
public static function errorHandler($severity, $message) {
restore_error_handler();
throw new InvalidDataTypeException($message, $severity);
}
/**
* {@inheritdoc}
*/
public static function getFileExtension() {
return 'yml';
}
/**
* Applies callbacks after parsing to ignore 1.1 style booleans.
*
* @param mixed $value
* Value from YAML file.
* @param string $tag
* Tag that triggered the callback.
* @param int $flags
* Scalar entity style flags.
*
* @return string|bool
* FALSE, false, TRUE and true are returned as booleans, everything else is
* returned as a string.
*/
public static function applyBooleanCallbacks($value, $tag, $flags) {
// YAML 1.1 spec dictates that 'Y', 'N', 'y' and 'n' are booleans. But, we
// want the 1.2 behavior, so we only consider 'false', 'FALSE', 'true' and
// 'TRUE' as booleans.
if (!in_array(strtolower($value), ['false', 'true'], TRUE)) {
return $value;
}
$map = [
'false' => FALSE,
'true' => TRUE,
];
return $map[strtolower($value)];
}
}