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FullyQualifiedGlobalStructuralElement.php
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FullyQualifiedGlobalStructuralElement.php
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<?php
declare(strict_types=1);
namespace Phan\Language\FQSEN;
use AssertionError;
use Exception;
use Phan\Exception\EmptyFQSENException;
use Phan\Exception\FQSENException;
use Phan\Exception\InvalidFQSENException;
use Phan\Language\Context;
use function array_slice;
/**
* A Fully-Qualified Global Structural Element
*/
abstract class FullyQualifiedGlobalStructuralElement extends AbstractFQSEN
{
use \Phan\Language\FQSEN\Alternatives;
use \Phan\Memoize;
/**
* @var string
* The namespace in this elements scope
* @readonly
*/
protected $namespace = '\\';
/**
* @param string $namespace
* The namespace in this element's scope
*
* @param string $name
* The name of this structural element
*
* @param int $alternate_id
* An alternate ID for the element for use when
* there are multiple definitions of the element
*
* @throws EmptyFQSENException
* if the name component of this FullyQualifiedGlobalStructuralElement is empty
*
* @throws EmptyFQSENException
* if the namespace of this FullyQualifiedGlobalStructuralElement is empty
*
* @throws InvalidFQSENException
* if the namespace begins with an invalid character
*/
protected function __construct(
string $namespace,
string $name,
int $alternate_id = 0
) {
if ($name === '') {
throw new EmptyFQSENException("The name of an FQSEN cannot be empty", \rtrim($namespace, '\\') . '\\');
}
if ($namespace === '') {
throw new EmptyFQSENException("The namespace cannot be empty", $name);
}
if ($namespace[0] !== '\\') {
throw new InvalidFQSENException("The first character of a namespace must be \\", $namespace . "\\" . $name);
}
parent::__construct($name);
$this->namespace = $namespace;
$this->alternate_id = $alternate_id;
}
/** @internal */
public const VALID_STRUCTURAL_ELEMENT_REGEX = '/^\\\\?[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*(\\\\[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)*$/D';
/** @internal */
public const VALID_STRUCTURAL_ELEMENT_REGEX_PART = '/^[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*$/D';
/**
* Construct a fully-qualified global structural element from a namespace and name.
*
* @param string $namespace
* The namespace in this element's scope
*
* @param string $name
* The name of this structural element (additional namespace prefixes here are properly handled)
*
* @param int $alternate_id
* An alternate ID for the element for use when
* there are multiple definitions of the element
*
* @return static
*
* @throws FQSENException on invalid/empty FQSEN
*/
public static function make(
string $namespace,
string $name,
int $alternate_id = 0
) {
// Transfer any relative namespace stuff from the
// name to the namespace.
$name_parts = \explode('\\', $name);
$name = (string)\array_pop($name_parts);
if ($name === '') {
throw new EmptyFQSENException(
"Empty name of fqsen",
\rtrim($namespace, "\\") . "\\" . \implode("\\", \array_merge($name_parts, [$name]))
);
}
foreach ($name_parts as $i => $part) {
if ($part === '') {
if ($i > 0) {
throw new InvalidFQSENException(
"Invalid part '' of fqsen",
\rtrim($namespace, "\\") . "\\" . \implode('\\', \array_merge(array_slice($name_parts, $i), [$name]))
);
}
continue;
}
if (!\preg_match(self::VALID_STRUCTURAL_ELEMENT_REGEX_PART, $part)) {
throw new InvalidFQSENException(
"Invalid part '$part' of fqsen",
\rtrim($namespace, "\\") . "\\$part\\" . \implode('\\', \array_merge(array_slice($name_parts, $i), [$name]))
);
}
if ($namespace === '\\') {
$namespace = '\\' . $part;
} else {
$namespace .= '\\' . $part;
}
}
$namespace = self::cleanNamespace($namespace);
if (!\preg_match(self::VALID_STRUCTURAL_ELEMENT_REGEX, \rtrim($namespace, '\\') . '\\' . $name)) {
throw new InvalidFQSENException("Invalid namespaced name", \rtrim($namespace, '\\') . '\\' . $name);
}
// use the canonicalName for $name instead of strtolower - Some subclasses(constants) are case-sensitive.
$key = static::class . '|' .
static::toString(\strtolower($namespace), static::canonicalLookupKey($name), $alternate_id);
$fqsen = self::memoizeStatic($key, static function () use ($namespace, $name, $alternate_id): FullyQualifiedGlobalStructuralElement {
return new static(
$namespace,
$name,
$alternate_id
);
});
return $fqsen;
}
/**
* @param $fully_qualified_string
* An fully qualified string like '\Namespace\Class'
*
* @return static
*
* @throws FQSENException on failure.
*/
public static function fromFullyQualifiedString(
string $fully_qualified_string
) {
$key = static::class . '|' . $fully_qualified_string;
return self::memoizeStatic(
$key,
/**
* @throws FQSENException
*/
static function () use ($fully_qualified_string): FullyQualifiedGlobalStructuralElement {
// Split off the alternate_id
$parts = \explode(',', $fully_qualified_string);
$fqsen_string = $parts[0];
$alternate_id = (int)($parts[1] ?? 0);
$parts = \explode('\\', $fqsen_string);
if ($parts[0] === '') {
\array_shift($parts);
if (\count($parts) === 0) {
throw new EmptyFQSENException("The name cannot be empty", $fqsen_string);
}
}
$name = (string)\array_pop($parts);
if ($name === '') {
throw new EmptyFQSENException("The name cannot be empty", $fqsen_string);
}
$namespace = '\\' . \implode('\\', $parts);
if ($namespace !== '\\') {
if (!\preg_match(self::VALID_STRUCTURAL_ELEMENT_REGEX, $namespace)) {
throw new InvalidFQSENException("The namespace $namespace is invalid", $fqsen_string);
}
} elseif (\count($parts) > 0) {
// E.g. from `\\stdClass` with two backslashes
throw new InvalidFQSENException("The namespace cannot have empty parts", $fqsen_string);
}
return static::make(
$namespace,
$name,
$alternate_id
);
}
);
}
/**
* Construct a fully-qualified global structural element from a namespace and name,
* if it was already constructed.
*
* @param string $namespace
* The namespace in this element's scope
*
* @param string $name
* The name of this structural element (additional namespace prefixes here are properly handled)
*
* @return ?static the FQSEN, if it was loaded
*
* @throws FQSENException on failure.
*/
public static function makeIfLoaded(string $namespace, string $name)
{
$name_parts = \explode('\\', $name);
$name = (string)\array_pop($name_parts);
if ($name === '') {
throw new EmptyFQSENException(
"Empty name of fqsen",
\rtrim($namespace, "\\") . "\\" . \implode("\\", \array_merge($name_parts, [$name]))
);
}
foreach ($name_parts as $i => $part) {
if ($part === '') {
if ($i > 0) {
throw new InvalidFQSENException(
"Invalid part '' of fqsen",
\rtrim($namespace, "\\") . "\\" . \implode('\\', \array_merge(array_slice($name_parts, $i), [$name]))
);
}
continue;
}
if (!\preg_match(self::VALID_STRUCTURAL_ELEMENT_REGEX_PART, $part)) {
throw new InvalidFQSENException(
"Invalid part '$part' of fqsen",
\rtrim($namespace, "\\") . "\\$part\\" . \implode('\\', \array_merge(array_slice($name_parts, $i), [$name]))
);
}
if ($namespace === '\\') {
$namespace = '\\' . $part;
} else {
$namespace .= '\\' . $part;
}
}
$namespace = self::cleanNamespace($namespace);
if (!\preg_match(self::VALID_STRUCTURAL_ELEMENT_REGEX, \rtrim($namespace, '\\') . '\\' . $name)) {
throw new InvalidFQSENException("Invalid namespaced name", \rtrim($namespace, '\\') . '\\' . $name);
}
$key = static::class . '|' .
static::toString(\strtolower($namespace), static::canonicalLookupKey($name), 0);
try {
return self::memoizeStatic(
$key,
/**
* @throws FQSENException
* @return never
*/
static function (): self {
// Reuse the exception to save time generating an unused stack trace.
static $exception;
$exception = ($exception ?? new Exception());
throw $exception;
}
);
} catch (\Exception $_) {
return null;
}
}
/**
* @param $fqsen_string
* An FQSEN string like '\Namespace\Class'
*
* @param Context $context
* The context in which the FQSEN string was found
*
* @return static
*
* @throws FQSENException if the $fqsen_string is invalid or empty
*/
public static function fromStringInContext(
string $fqsen_string,
Context $context
) {
// Check to see if we're fully qualified
if (($fqsen_string[0] ?? '') === '\\') {
return static::fromFullyQualifiedString($fqsen_string);
}
// @phan-suppress-next-line PhanAbstractStaticMethodCallInStatic Do not call fromStringInContext directly on this abstract class
$namespace_map_type = static::getNamespaceMapType();
if ($namespace_map_type === \ast\AST_CONST && \in_array(\strtolower($fqsen_string), ['true', 'false', 'null'], true)) {
return static::fromFullyQualifiedString($fqsen_string);
}
// Split off the alternate ID
$parts = \explode(',', $fqsen_string);
$fqsen_string = $parts[0];
$alternate_id = (int)($parts[1] ?? 0);
$parts = \explode('\\', $fqsen_string);
// Split the parts into the namespace(0 or more components) and the last name.
$name = \array_pop($parts);
// @phan-suppress-next-line PhanSuspiciousTruthyString
if (!$name) {
throw new InvalidFQSENException("The name cannot be empty", $fqsen_string);
}
// Check for a name map
if ($context->hasNamespaceMapFor($namespace_map_type, $fqsen_string)) {
return $context->getNamespaceMapFor(
$namespace_map_type,
$fqsen_string
);
}
$namespace = \implode('\\', \array_filter($parts));
// n.b.: Functions must override this method because
// they don't prefix the namespace for naked
// calls
if ($namespace === '') {
$namespace = $context->getNamespace();
}
return static::make(
$namespace,
$name,
$alternate_id
);
}
/**
* @return int
* The namespace map type such as \ast\flags\USE_NORMAL or \ast\flags\USE_FUNCTION
*/
abstract protected static function getNamespaceMapType(): int;
/**
* @return string
* The namespace associated with this FQSEN
*/
public function getNamespace(): string
{
return $this->namespace;
}
/**
* @return string
* The namespace+name associated with this FQSEN.
* (e.g. 'ast\parse_code')
*/
public function getNamespacedName(): string
{
if ($this->namespace === '\\') {
return $this->name;
}
return \ltrim($this->namespace, '\\') . '\\' . $this->name;
}
/**
* @return static a copy of this global structural element with a different namespace
* @suppress PhanUnreferencedPublicMethod
*/
public function withNamespace(
string $namespace
) {
// @phan-suppress-next-line PhanThrowTypeAbsentForCall the class name was already validated
return static::make(
self::cleanNamespace($namespace),
$this->name,
$this->getAlternateId()
);
}
/**
* @return static
* A FQSEN with the given alternate_id set
*/
public function withAlternateId(
int $alternate_id
) {
if ($this->getAlternateId() === $alternate_id) {
return $this;
}
if ($alternate_id >= 1000) {
throw new AssertionError("Your alternate IDs have run away");
}
// @phan-suppress-next-line PhanThrowTypeAbsentForCall the class name was already validated
return static::make(
$this->namespace,
$this->name,
$alternate_id
);
}
/**
* @param string $namespace (can be empty)
*
* @return string
* A cleaned version of the given namespace such that
* its always prefixed with a '\' and never ends in a
* '\', and is the string "\" if there is no namespace.
*/
protected static function cleanNamespace(string $namespace): string
{
if ($namespace === ''
|| $namespace === '\\'
) {
return '\\';
}
// Ensure that the first character of the namespace
// is always a '\'
if ($namespace[0] !== '\\') {
$namespace = '\\' . $namespace;
}
// Ensure that we don't have a trailing '\' on the
// namespace
return \rtrim($namespace, '\\');
}
/**
* @return string
* A string representation of this fully-qualified
* structural element name.
*/
public static function toString(
string $namespace,
string $name,
int $alternate_id
): string {
$fqsen_string = $namespace;
if ($fqsen_string !== '' && $fqsen_string !== '\\') {
$fqsen_string .= '\\';
}
$fqsen_string .= static::canonicalName($name);
// Append an alternate ID if we need to disambiguate
// multiple definitions
if ($alternate_id) {
$fqsen_string .= ',' . $alternate_id;
}
return $fqsen_string;
}
/** @var string|null caches the value of $this->__toString() */
private $as_string = null;
/**
* @return string
* A string representation of this fully-qualified
* structural element name.
*/
public function __toString(): string
{
return $this->as_string ?? $this->as_string = static::toString(
$this->namespace,
$this->name,
$this->getAlternateId()
);
}
}

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