ParameterType.php

<?php declare(strict_types = 1);
 
namespace DaveRandom\CallbackValidator;
 
final class ParameterType extends Type
{
    const CONTRAVARIANT = 0x01 << 8;
 
    const COVARIANT = 0x02 << 8;
 
    const VARIADIC = 0x04 << 8;
 
    const OPTIONAL = 0x08 << 8;
 
    private $parameterName;
 
    public $isVariadic;
 
    public $isOptional;
 
    public static function createFromReflectionParameter($reflection, $flags = 0)
    {
        $parameterName = $reflection->getName();
 
        if ($reflection->isPassedByReference()) {
            $flags |= self::REFERENCE;
        }
 
        if ($reflection->isVariadic()) {
            $flags |= self::VARIADIC;
        }
 
        if ($reflection->isOptional()) {
            $flags |= self::OPTIONAL;
        }
 
        $typeName = null;
        $typeReflection = $reflection->getType();
 
        if ($typeReflection instanceof \ReflectionNamedType) {
            $typeName = $typeReflection->getName();
 
            if ($typeReflection->allowsNull()) {
                $flags |= self::NULLABLE;
            }
        } elseif ($typeReflection !== null) {
            throw new \LogicException("Unsupported reflection type " . get_class($typeReflection));
        }
 
        return new self($parameterName, $typeName, $flags);
    }
 
    public function __construct($parameterName, $typeName = null, $flags = self::CONTRAVARIANT)
    {
        $flags = (int)$flags;
 
        parent::__construct($typeName, $flags, ($flags & self::COVARIANT) !== 0, ($flags & self::CONTRAVARIANT) !== 0);
 
        $this->parameterName = (string)$parameterName;
        $this->isOptional = (bool)($flags & self::OPTIONAL);
        $this->isVariadic = (bool)($flags & self::VARIADIC);
    }
 
    public function __toString()
    {
        $string = '';
 
        if ($this->typeName !== null) {
            if ($this->isNullable) {
                $string .= '?';
            }
 
            $string .= $this->typeName . ' ';
        }
 
        if ($this->isByReference) {
            $string .= '&';
        }
 
        if ($this->isVariadic) {
            $string .= '...';
        }
 
        return $string . '$' . $this->parameterName;
    }
}