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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <[email protected]>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\VarExporter\Internal;
use Symfony\Component\VarExporter\Exception\NotInstantiableTypeException;
/**
* @author Nicolas Grekas <[email protected]>
*
* @internal
*/
class Exporter
{
/**
* Prepares an array of values for VarExporter.
*
* For performance this method is public and has no type-hints.
*
* @param array &$values
* @param \SplObjectStorage $objectsPool
* @param array &$refsPool
* @param int &$objectsCount
* @param bool &$valuesAreStatic
*
* @throws NotInstantiableTypeException When a value cannot be serialized
*/
public static function prepare($values, $objectsPool, &$refsPool, &$objectsCount, &$valuesAreStatic): array
{
$refs = $values;
foreach ($values as $k => $value) {
if (\is_resource($value)) {
throw new NotInstantiableTypeException(get_resource_type($value).' resource');
}
$refs[$k] = $objectsPool;
if ($isRef = !$valueIsStatic = $values[$k] !== $objectsPool) {
$values[$k] = &$value; // Break hard references to make $values completely
unset($value); // independent from the original structure
$refs[$k] = $value = $values[$k];
if ($value instanceof Reference && 0 > $value->id) {
$valuesAreStatic = false;
++$value->count;
continue;
}
$refsPool[] = [&$refs[$k], $value, &$value];
$refs[$k] = $values[$k] = new Reference(-\count($refsPool), $value);
}
if (\is_array($value)) {
if ($value) {
$value = self::prepare($value, $objectsPool, $refsPool, $objectsCount, $valueIsStatic);
}
goto handle_value;
} elseif (!\is_object($value) || $value instanceof \UnitEnum) {
goto handle_value;
}
$valueIsStatic = false;
if (isset($objectsPool[$value])) {
++$objectsCount;
$value = new Reference($objectsPool[$value][0]);
goto handle_value;
}
$class = \get_class($value);
$reflector = Registry::$reflectors[$class] ?? Registry::getClassReflector($class);
if ($reflector->hasMethod('__serialize')) {
if (!$reflector->getMethod('__serialize')->isPublic()) {
throw new \Error(sprintf('Call to %s method "%s::__serialize()".', $reflector->getMethod('__serialize')->isProtected() ? 'protected' : 'private', $class));
}
if (!\is_array($properties = $value->__serialize())) {
throw new \TypeError($class.'::__serialize() must return an array');
}
goto prepare_value;
}
$properties = [];
$sleep = null;
$proto = Registry::$prototypes[$class];
if (($value instanceof \ArrayIterator || $value instanceof \ArrayObject) && null !== $proto) {
// ArrayIterator and ArrayObject need special care because their "flags"
// option changes the behavior of the (array) casting operator.
[$arrayValue, $properties] = self::getArrayObjectProperties($value, $proto);
// populates Registry::$prototypes[$class] with a new instance
Registry::getClassReflector($class, Registry::$instantiableWithoutConstructor[$class], Registry::$cloneable[$class]);
} elseif ($value instanceof \SplObjectStorage && Registry::$cloneable[$class] && null !== $proto) {
// By implementing Serializable, SplObjectStorage breaks
// internal references; let's deal with it on our own.
foreach (clone $value as $v) {
$properties[] = $v;
$properties[] = $value[$v];
}
$properties = ['SplObjectStorage' => ["\0" => $properties]];
$arrayValue = (array) $value;
} elseif ($value instanceof \Serializable || $value instanceof \__PHP_Incomplete_Class) {
++$objectsCount;
$objectsPool[$value] = [$id = \count($objectsPool), serialize($value), [], 0];
$value = new Reference($id);
goto handle_value;
} else {
if (method_exists($class, '__sleep')) {
if (!\is_array($sleep = $value->__sleep())) {
trigger_error('serialize(): __sleep should return an array only containing the names of instance-variables to serialize', \E_USER_NOTICE);
$value = null;
goto handle_value;
}
$sleep = array_flip($sleep);
}
$arrayValue = (array) $value;
}
$proto = (array) $proto;
foreach ($arrayValue as $name => $v) {
$i = 0;
$n = (string) $name;
if ('' === $n || "\0" !== $n[0]) {
$c = 'stdClass';
} elseif ('*' === $n[1]) {
$n = substr($n, 3);
$c = $reflector->getProperty($n)->class;
if ('Error' === $c) {
$c = 'TypeError';
} elseif ('Exception' === $c) {
$c = 'ErrorException';
}
} else {
$i = strpos($n, "\0", 2);
$c = substr($n, 1, $i - 1);
$n = substr($n, 1 + $i);
}
if (null !== $sleep) {
if (!isset($sleep[$n]) || ($i && $c !== $class)) {
continue;
}
$sleep[$n] = false;
}
if (!\array_key_exists($name, $proto) || $proto[$name] !== $v || "\x00Error\x00trace" === $name || "\x00Exception\x00trace" === $name) {
$properties[$c][$n] = $v;
}
}
if ($sleep) {
foreach ($sleep as $n => $v) {
if (false !== $v) {
trigger_error(sprintf('serialize(): "%s" returned as member variable from __sleep() but does not exist', $n), \E_USER_NOTICE);
}
}
}
prepare_value:
$objectsPool[$value] = [$id = \count($objectsPool)];
$properties = self::prepare($properties, $objectsPool, $refsPool, $objectsCount, $valueIsStatic);
++$objectsCount;
$objectsPool[$value] = [$id, $class, $properties, method_exists($class, '__unserialize') ? -$objectsCount : (method_exists($class, '__wakeup') ? $objectsCount : 0)];
$value = new Reference($id);
handle_value:
if ($isRef) {
unset($value); // Break the hard reference created above
} elseif (!$valueIsStatic) {
$values[$k] = $value;
}
$valuesAreStatic = $valueIsStatic && $valuesAreStatic;
}
return $values;
}
public static function export($value, string $indent = '')
{
switch (true) {
case \is_int($value) || \is_float($value) || $value instanceof \UnitEnum: return var_export($value, true);
case [] === $value: return '[]';
case false === $value: return 'false';
case true === $value: return 'true';
case null === $value: return 'null';
case '' === $value: return "''";
}
if ($value instanceof Reference) {
if (0 <= $value->id) {
return '$o['.$value->id.']';
}
if (!$value->count) {
return self::export($value->value, $indent);
}
$value = -$value->id;
return '&$r['.$value.']';
}
$subIndent = $indent.' ';
if (\is_string($value)) {
$code = sprintf("'%s'", addcslashes($value, "'\\"));
$code = preg_replace_callback("/((?:[\\0\\r\\n]|\u{202A}|\u{202B}|\u{202D}|\u{202E}|\u{2066}|\u{2067}|\u{2068}|\u{202C}|\u{2069})++)(.)/", function ($m) use ($subIndent) {
$m[1] = sprintf('\'."%s".\'', str_replace(
["\0", "\r", "\n", "\u{202A}", "\u{202B}", "\u{202D}", "\u{202E}", "\u{2066}", "\u{2067}", "\u{2068}", "\u{202C}", "\u{2069}", '\n\\'],
['\0', '\r', '\n', '\u{202A}', '\u{202B}', '\u{202D}', '\u{202E}', '\u{2066}', '\u{2067}', '\u{2068}', '\u{202C}', '\u{2069}', '\n"'."\n".$subIndent.'."\\'],
$m[1]
));
if ("'" === $m[2]) {
return substr($m[1], 0, -2);
}
if ('n".\'' === substr($m[1], -4)) {
return substr_replace($m[1], "\n".$subIndent.".'".$m[2], -2);
}
return $m[1].$m[2];
}, $code, -1, $count);
if ($count && str_starts_with($code, "''.")) {
$code = substr($code, 3);
}
return $code;
}
if (\is_array($value)) {
$j = -1;
$code = '';
foreach ($value as $k => $v) {
$code .= $subIndent;
if (!\is_int($k) || 1 !== $k - $j) {
$code .= self::export($k, $subIndent).' => ';
}
if (\is_int($k) && $k > $j) {
$j = $k;
}
$code .= self::export($v, $subIndent).",\n";
}
return "[\n".$code.$indent.']';
}
if ($value instanceof Values) {
$code = $subIndent."\$r = [],\n";
foreach ($value->values as $k => $v) {
$code .= $subIndent.'$r['.$k.'] = '.self::export($v, $subIndent).",\n";
}
return "[\n".$code.$indent.']';
}
if ($value instanceof Registry) {
return self::exportRegistry($value, $indent, $subIndent);
}
if ($value instanceof Hydrator) {
return self::exportHydrator($value, $indent, $subIndent);
}
throw new \UnexpectedValueException(sprintf('Cannot export value of type "%s".', get_debug_type($value)));
}
private static function exportRegistry(Registry $value, string $indent, string $subIndent): string
{
$code = '';
$serializables = [];
$seen = [];
$prototypesAccess = 0;
$factoriesAccess = 0;
$r = '\\'.Registry::class;
$j = -1;
foreach ($value->classes as $k => $class) {
if (':' === ($class[1] ?? null)) {
$serializables[$k] = $class;
continue;
}
if (!Registry::$instantiableWithoutConstructor[$class]) {
if (is_subclass_of($class, 'Serializable') && !method_exists($class, '__unserialize')) {
$serializables[$k] = 'C:'.\strlen($class).':"'.$class.'":0:{}';
} else {
$serializables[$k] = 'O:'.\strlen($class).':"'.$class.'":0:{}';
}
if (is_subclass_of($class, 'Throwable')) {
$eol = is_subclass_of($class, 'Error') ? "\0Error\0" : "\0Exception\0";
$serializables[$k] = substr_replace($serializables[$k], '1:{s:'.(5 + \strlen($eol)).':"'.$eol.'trace";a:0:{}}', -4);
}
continue;
}
$code .= $subIndent.(1 !== $k - $j ? $k.' => ' : '');
$j = $k;
$eol = ",\n";
$c = '['.self::export($class).']';
if ($seen[$class] ?? false) {
if (Registry::$cloneable[$class]) {
++$prototypesAccess;
$code .= 'clone $p'.$c;
} else {
++$factoriesAccess;
$code .= '$f'.$c.'()';
}
} else {
$seen[$class] = true;
if (Registry::$cloneable[$class]) {
$code .= 'clone ('.($prototypesAccess++ ? '$p' : '($p = &'.$r.'::$prototypes)').$c.' ?? '.$r.'::p';
} else {
$code .= '('.($factoriesAccess++ ? '$f' : '($f = &'.$r.'::$factories)').$c.' ?? '.$r.'::f';
$eol = '()'.$eol;
}
$code .= '('.substr($c, 1, -1).'))';
}
$code .= $eol;
}
if (1 === $prototypesAccess) {
$code = str_replace('($p = &'.$r.'::$prototypes)', $r.'::$prototypes', $code);
}
if (1 === $factoriesAccess) {
$code = str_replace('($f = &'.$r.'::$factories)', $r.'::$factories', $code);
}
if ('' !== $code) {
$code = "\n".$code.$indent;
}
if ($serializables) {
$code = $r.'::unserialize(['.$code.'], '.self::export($serializables, $indent).')';
} else {
$code = '['.$code.']';
}
return '$o = '.$code;
}
private static function exportHydrator(Hydrator $value, string $indent, string $subIndent): string
{
$code = '';
foreach ($value->properties as $class => $properties) {
$code .= $subIndent.' '.self::export($class).' => '.self::export($properties, $subIndent.' ').",\n";
}
$code = [
self::export($value->registry, $subIndent),
self::export($value->values, $subIndent),
'' !== $code ? "[\n".$code.$subIndent.']' : '[]',
self::export($value->value, $subIndent),
self::export($value->wakeups, $subIndent),
];
return '\\'.\get_class($value)."::hydrate(\n".$subIndent.implode(",\n".$subIndent, $code)."\n".$indent.')';
}
/**
* @param \ArrayIterator|\ArrayObject $value
* @param \ArrayIterator|\ArrayObject $proto
*/
private static function getArrayObjectProperties($value, $proto): array
{
$reflector = $value instanceof \ArrayIterator ? 'ArrayIterator' : 'ArrayObject';
$reflector = Registry::$reflectors[$reflector] ?? Registry::getClassReflector($reflector);
$properties = [
$arrayValue = (array) $value,
$reflector->getMethod('getFlags')->invoke($value),
$value instanceof \ArrayObject ? $reflector->getMethod('getIteratorClass')->invoke($value) : 'ArrayIterator',
];
$reflector = $reflector->getMethod('setFlags');
$reflector->invoke($proto, \ArrayObject::STD_PROP_LIST);
if ($properties[1] & \ArrayObject::STD_PROP_LIST) {
$reflector->invoke($value, 0);
$properties[0] = (array) $value;
} else {
$reflector->invoke($value, \ArrayObject::STD_PROP_LIST);
$arrayValue = (array) $value;
}
$reflector->invoke($value, $properties[1]);
if ([[], 0, 'ArrayIterator'] === $properties) {
$properties = [];
} else {
if ('ArrayIterator' === $properties[2]) {
unset($properties[2]);
}
$properties = [$reflector->class => ["\0" => $properties]];
}
return [$arrayValue, $properties];
}
}
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