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ReflectionLanguageConstruct.php
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ReflectionLanguageConstruct.php
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<?php
/*
* This file is part of Psy Shell.
*
* (c) 2012-2023 Justin Hileman
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Psy\Reflection;
/**
* A fake ReflectionFunction but for language constructs.
*/
class ReflectionLanguageConstruct extends \ReflectionFunctionAbstract
{
public $keyword;
/**
* Language construct parameter definitions.
*/
private const LANGUAGE_CONSTRUCTS = [
'isset' => [
'var' => [],
'...' => [
'isOptional' => true,
'defaultValue' => null,
],
],
'unset' => [
'var' => [],
'...' => [
'isOptional' => true,
'defaultValue' => null,
],
],
'empty' => [
'var' => [],
],
'echo' => [
'arg1' => [],
'...' => [
'isOptional' => true,
'defaultValue' => null,
],
],
'print' => [
'arg' => [],
],
'die' => [
'status' => [
'isOptional' => true,
'defaultValue' => 0,
],
],
'exit' => [
'status' => [
'isOptional' => true,
'defaultValue' => 0,
],
],
];
/**
* Construct a ReflectionLanguageConstruct object.
*
* @param string $keyword
*/
public function __construct(string $keyword)
{
if (!self::isLanguageConstruct($keyword)) {
throw new \InvalidArgumentException('Unknown language construct: '.$keyword);
}
$this->keyword = $keyword;
}
/**
* This can't (and shouldn't) do anything :).
*
* @throws \RuntimeException
*/
public static function export($name)
{
throw new \RuntimeException('Not yet implemented because it\'s unclear what I should do here :)');
}
/**
* Get language construct name.
*/
public function getName(): string
{
return $this->keyword;
}
/**
* None of these return references.
*/
public function returnsReference(): bool
{
return false;
}
/**
* Get language construct params.
*
* @return array
*/
public function getParameters(): array
{
$params = [];
foreach (self::LANGUAGE_CONSTRUCTS[$this->keyword] as $parameter => $opts) {
$params[] = new ReflectionLanguageConstructParameter($this->keyword, $parameter, $opts);
}
return $params;
}
/**
* Gets the file name from a language construct.
*
* (Hint: it always returns false)
*
* @todo remove \ReturnTypeWillChange attribute after dropping support for PHP 7.x (when we can use union types)
*
* @return string|false (false)
*/
#[\ReturnTypeWillChange]
public function getFileName()
{
return false;
}
/**
* To string.
*/
public function __toString(): string
{
return $this->getName();
}
/**
* Check whether keyword is a (known) language construct.
*
* @param string $keyword
*/
public static function isLanguageConstruct(string $keyword): bool
{
return \array_key_exists($keyword, self::LANGUAGE_CONSTRUCTS);
}
}

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