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<?php
/**
* This file is part of the Nette Framework (https://nette.org)
* Copyright (c) 2004 David Grudl (https://davidgrudl.com)
*/
declare(strict_types=1);
namespace Nette\Utils;
use Nette;
/**
* PHP reflection helpers.
*/
final class Reflection
{
use Nette\StaticClass;
private const BUILTIN_TYPES = [
'string' => 1, 'int' => 1, 'float' => 1, 'bool' => 1, 'array' => 1, 'object' => 1,
'callable' => 1, 'iterable' => 1, 'void' => 1, 'null' => 1, 'mixed' => 1, 'false' => 1,
'never' => 1,
];
private const CLASS_KEYWORDS = [
'self' => 1, 'parent' => 1, 'static' => 1,
];
/**
* Determines if type is PHP built-in type. Otherwise, it is the class name.
*/
public static function isBuiltinType(string $type): bool
{
return isset(self::BUILTIN_TYPES[strtolower($type)]);
}
/**
* Determines if type is special class name self/parent/static.
*/
public static function isClassKeyword(string $name): bool
{
return isset(self::CLASS_KEYWORDS[strtolower($name)]);
}
/**
* Returns the type of return value of given function or method and normalizes `self`, `static`, and `parent` to actual class names.
* If the function does not have a return type, it returns null.
* If the function has union or intersection type, it throws Nette\InvalidStateException.
*/
public static function getReturnType(\ReflectionFunctionAbstract $func): ?string
{
$type = $func->getReturnType() ?? (PHP_VERSION_ID >= 80100 && $func instanceof \ReflectionMethod ? $func->getTentativeReturnType() : null);
return self::getType($func, $type);
}
/**
* @deprecated
*/
public static function getReturnTypes(\ReflectionFunctionAbstract $func): array
{
$type = Type::fromReflection($func);
return $type ? $type->getNames() : [];
}
/**
* Returns the type of given parameter and normalizes `self` and `parent` to the actual class names.
* If the parameter does not have a type, it returns null.
* If the parameter has union or intersection type, it throws Nette\InvalidStateException.
*/
public static function getParameterType(\ReflectionParameter $param): ?string
{
return self::getType($param, $param->getType());
}
/**
* @deprecated
*/
public static function getParameterTypes(\ReflectionParameter $param): array
{
$type = Type::fromReflection($param);
return $type ? $type->getNames() : [];
}
/**
* Returns the type of given property and normalizes `self` and `parent` to the actual class names.
* If the property does not have a type, it returns null.
* If the property has union or intersection type, it throws Nette\InvalidStateException.
*/
public static function getPropertyType(\ReflectionProperty $prop): ?string
{
return self::getType($prop, PHP_VERSION_ID >= 70400 ? $prop->getType() : null);
}
/**
* @deprecated
*/
public static function getPropertyTypes(\ReflectionProperty $prop): array
{
$type = Type::fromReflection($prop);
return $type ? $type->getNames() : [];
}
/**
* @param \ReflectionFunction|\ReflectionMethod|\ReflectionParameter|\ReflectionProperty $reflection
*/
private static function getType($reflection, ?\ReflectionType $type): ?string
{
if ($type === null) {
return null;
} elseif ($type instanceof \ReflectionNamedType) {
return Type::resolve($type->getName(), $reflection);
} elseif ($type instanceof \ReflectionUnionType || $type instanceof \ReflectionIntersectionType) {
throw new Nette\InvalidStateException('The ' . self::toString($reflection) . ' is not expected to have a union or intersection type.');
} else {
throw new Nette\InvalidStateException('Unexpected type of ' . self::toString($reflection));
}
}
/**
* Returns the default value of parameter. If it is a constant, it returns its value.
* @return mixed
* @throws \ReflectionException If the parameter does not have a default value or the constant cannot be resolved
*/
public static function getParameterDefaultValue(\ReflectionParameter $param)
{
if ($param->isDefaultValueConstant()) {
$const = $orig = $param->getDefaultValueConstantName();
$pair = explode('::', $const);
if (isset($pair[1])) {
$pair[0] = Type::resolve($pair[0], $param);
try {
$rcc = new \ReflectionClassConstant($pair[0], $pair[1]);
} catch (\ReflectionException $e) {
$name = self::toString($param);
throw new \ReflectionException("Unable to resolve constant $orig used as default value of $name.", 0, $e);
}
return $rcc->getValue();
} elseif (!defined($const)) {
$const = substr((string) strrchr($const, '\\'), 1);
if (!defined($const)) {
$name = self::toString($param);
throw new \ReflectionException("Unable to resolve constant $orig used as default value of $name.");
}
}
return constant($const);
}
return $param->getDefaultValue();
}
/**
* Returns a reflection of a class or trait that contains a declaration of given property. Property can also be declared in the trait.
*/
public static function getPropertyDeclaringClass(\ReflectionProperty $prop): \ReflectionClass
{
foreach ($prop->getDeclaringClass()->getTraits() as $trait) {
if ($trait->hasProperty($prop->name)
// doc-comment guessing as workaround for insufficient PHP reflection
&& $trait->getProperty($prop->name)->getDocComment() === $prop->getDocComment()
) {
return self::getPropertyDeclaringClass($trait->getProperty($prop->name));
}
}
return $prop->getDeclaringClass();
}
/**
* Returns a reflection of a method that contains a declaration of $method.
* Usually, each method is its own declaration, but the body of the method can also be in the trait and under a different name.
*/
public static function getMethodDeclaringMethod(\ReflectionMethod $method): \ReflectionMethod
{
// file & line guessing as workaround for insufficient PHP reflection
$decl = $method->getDeclaringClass();
if ($decl->getFileName() === $method->getFileName()
&& $decl->getStartLine() <= $method->getStartLine()
&& $decl->getEndLine() >= $method->getEndLine()
) {
return $method;
}
$hash = [$method->getFileName(), $method->getStartLine(), $method->getEndLine()];
if (($alias = $decl->getTraitAliases()[$method->name] ?? null)
&& ($m = new \ReflectionMethod($alias))
&& $hash === [$m->getFileName(), $m->getStartLine(), $m->getEndLine()]
) {
return self::getMethodDeclaringMethod($m);
}
foreach ($decl->getTraits() as $trait) {
if ($trait->hasMethod($method->name)
&& ($m = $trait->getMethod($method->name))
&& $hash === [$m->getFileName(), $m->getStartLine(), $m->getEndLine()]
) {
return self::getMethodDeclaringMethod($m);
}
}
return $method;
}
/**
* Finds out if reflection has access to PHPdoc comments. Comments may not be available due to the opcode cache.
*/
public static function areCommentsAvailable(): bool
{
static $res;
return $res ?? $res = (bool) (new \ReflectionMethod(__METHOD__))->getDocComment();
}
public static function toString(\Reflector $ref): string
{
if ($ref instanceof \ReflectionClass) {
return $ref->name;
} elseif ($ref instanceof \ReflectionMethod) {
return $ref->getDeclaringClass()->name . '::' . $ref->name . '()';
} elseif ($ref instanceof \ReflectionFunction) {
return $ref->name . '()';
} elseif ($ref instanceof \ReflectionProperty) {
return self::getPropertyDeclaringClass($ref)->name . '::$' . $ref->name;
} elseif ($ref instanceof \ReflectionParameter) {
return '$' . $ref->name . ' in ' . self::toString($ref->getDeclaringFunction());
} else {
throw new Nette\InvalidArgumentException;
}
}
/**
* Expands the name of the class to full name in the given context of given class.
* Thus, it returns how the PHP parser would understand $name if it were written in the body of the class $context.
* @throws Nette\InvalidArgumentException
*/
public static function expandClassName(string $name, \ReflectionClass $context): string
{
$lower = strtolower($name);
if (empty($name)) {
throw new Nette\InvalidArgumentException('Class name must not be empty.');
} elseif (isset(self::BUILTIN_TYPES[$lower])) {
return $lower;
} elseif ($lower === 'self' || $lower === 'static') {
return $context->name;
} elseif ($lower === 'parent') {
return $context->getParentClass()
? $context->getParentClass()->name
: 'parent';
} elseif ($name[0] === '\\') { // fully qualified name
return ltrim($name, '\\');
}
$uses = self::getUseStatements($context);
$parts = explode('\\', $name, 2);
if (isset($uses[$parts[0]])) {
$parts[0] = $uses[$parts[0]];
return implode('\\', $parts);
} elseif ($context->inNamespace()) {
return $context->getNamespaceName() . '\\' . $name;
} else {
return $name;
}
}
/** @return array of [alias => class] */
public static function getUseStatements(\ReflectionClass $class): array
{
if ($class->isAnonymous()) {
throw new Nette\NotImplementedException('Anonymous classes are not supported.');
}
static $cache = [];
if (!isset($cache[$name = $class->name])) {
if ($class->isInternal()) {
$cache[$name] = [];
} else {
$code = file_get_contents($class->getFileName());
$cache = self::parseUseStatements($code, $name) + $cache;
}
}
return $cache[$name];
}
/**
* Parses PHP code to [class => [alias => class, ...]]
*/
private static function parseUseStatements(string $code, ?string $forClass = null): array
{
try {
$tokens = token_get_all($code, TOKEN_PARSE);
} catch (\ParseError $e) {
trigger_error($e->getMessage(), E_USER_NOTICE);
$tokens = [];
}
$namespace = $class = $classLevel = $level = null;
$res = $uses = [];
$nameTokens = PHP_VERSION_ID < 80000
? [T_STRING, T_NS_SEPARATOR]
: [T_STRING, T_NS_SEPARATOR, T_NAME_QUALIFIED, T_NAME_FULLY_QUALIFIED];
while ($token = current($tokens)) {
next($tokens);
switch (is_array($token) ? $token[0] : $token) {
case T_NAMESPACE:
$namespace = ltrim(self::fetch($tokens, $nameTokens) . '\\', '\\');
$uses = [];
break;
case T_CLASS:
case T_INTERFACE:
case T_TRAIT:
case PHP_VERSION_ID < 80100
? T_CLASS
: T_ENUM:
if ($name = self::fetch($tokens, T_STRING)) {
$class = $namespace . $name;
$classLevel = $level + 1;
$res[$class] = $uses;
if ($class === $forClass) {
return $res;
}
}
break;
case T_USE:
while (!$class && ($name = self::fetch($tokens, $nameTokens))) {
$name = ltrim($name, '\\');
if (self::fetch($tokens, '{')) {
while ($suffix = self::fetch($tokens, $nameTokens)) {
if (self::fetch($tokens, T_AS)) {
$uses[self::fetch($tokens, T_STRING)] = $name . $suffix;
} else {
$tmp = explode('\\', $suffix);
$uses[end($tmp)] = $name . $suffix;
}
if (!self::fetch($tokens, ',')) {
break;
}
}
} elseif (self::fetch($tokens, T_AS)) {
$uses[self::fetch($tokens, T_STRING)] = $name;
} else {
$tmp = explode('\\', $name);
$uses[end($tmp)] = $name;
}
if (!self::fetch($tokens, ',')) {
break;
}
}
break;
case T_CURLY_OPEN:
case T_DOLLAR_OPEN_CURLY_BRACES:
case '{':
$level++;
break;
case '}':
if ($level === $classLevel) {
$class = $classLevel = null;
}
$level--;
}
}
return $res;
}
private static function fetch(array &$tokens, $take): ?string
{
$res = null;
while ($token = current($tokens)) {
[$token, $s] = is_array($token) ? $token : [$token, $token];
if (in_array($token, (array) $take, true)) {
$res .= $s;
} elseif (!in_array($token, [T_DOC_COMMENT, T_WHITESPACE, T_COMMENT], true)) {
break;
}
next($tokens);
}
return $res;
}
}