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<?php declare(strict_types = 1); |
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namespace DaveRandom\CallbackValidator; |
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final class MatchTester |
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{ |
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/** |
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* Thou shalt not instantiate |
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*/ |
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private function __construct() { } |
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/** |
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* Lookup table of all built-in types |
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*/ |
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private static $builtInTypes = [ |
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BuiltInTypes::STRING => true, |
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BuiltInTypes::INT => true, |
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BuiltInTypes::FLOAT => true, |
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BuiltInTypes::BOOL => true, |
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BuiltInTypes::ARRAY => true, |
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BuiltInTypes::CALLABLE => true, |
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BuiltInTypes::VOID => true, |
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BuiltInTypes::ITERABLE => true, |
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]; |
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/** |
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* Lookup table of scalar types |
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*/ |
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private static $scalarTypes = [ |
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BuiltInTypes::STRING => true, |
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BuiltInTypes::INT => true, |
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BuiltInTypes::FLOAT => true, |
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BuiltInTypes::BOOL => true, |
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]; |
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/** |
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* @param string $superTypeName |
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* @param string $subTypeName |
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* @return bool |
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*/ |
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public static function isWeakScalarMatch($superTypeName, $subTypeName) |
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{ |
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// Nothing else satisfies array, callable, void or iterable |
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if (!isset(self::$scalarTypes[$superTypeName])) { |
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return false; |
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} |
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// Scalars can all cast to each other |
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if (isset(self::$scalarTypes[$subTypeName])) { |
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return true; |
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} |
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// Classes with __toString() satisfy string |
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if ($superTypeName === BuiltInTypes::STRING && \method_exists($subTypeName, '__toString')) { |
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return true; |
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} |
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return false; |
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} |
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/** |
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* @param string|null $superTypeName |
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* @param bool $superTypeNullable |
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* @param string|null $subTypeName |
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* @param bool $subTypeNullable |
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* @param bool $weak |
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* @return bool |
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*/ |
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public static function isMatch($superTypeName, $superTypeNullable, $subTypeName, $subTypeNullable, $weak) |
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{ |
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// If the super type is unspecified, anything is a match |
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if ($superTypeName === null) { |
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return true; |
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} |
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// If the sub type is unspecified, nothing is a match |
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if ($subTypeName === null) { |
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return false; |
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} |
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$superTypeName = (string)$superTypeName; |
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$subTypeName = (string)$subTypeName; |
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// Sub type cannot be nullable unless the super type is as well |
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if ($subTypeNullable && !$superTypeNullable) { |
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// nullable void doesn't really make sense but for completeness... |
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return $superTypeName === BuiltInTypes::VOID && $subTypeName === BuiltInTypes::VOID; |
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} |
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// If the string is an exact match it's definitely acceptable |
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if ($superTypeName === $subTypeName) { |
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return true; |
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} |
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// Check iterable |
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View Code Duplication |
if ($superTypeName === BuiltInTypes::ITERABLE) { |
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return $subTypeName === BuiltInTypes::ARRAY |
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|| $subTypeName === \Traversable::class |
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|| \is_subclass_of($subTypeName, \Traversable::class); |
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} |
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// Check callable |
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if ($superTypeName === BuiltInTypes::CALLABLE) { |
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return $subTypeName === \Closure::class |
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|| \method_exists($subTypeName, '__invoke') |
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|| \is_subclass_of($subTypeName, \Closure::class); |
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} |
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// If the super type is built-in, check whether casting rules can succeed |
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if (isset(self::$builtInTypes[$superTypeName])) { |
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// Fail immediately in strict mode |
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return $weak && self::isWeakScalarMatch($superTypeName, $subTypeName); |
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} |
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// We now know the super type is not built-in and there's no string match, sub type must not be built-in |
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if (isset(self::$builtInTypes[$subTypeName])) { |
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return false; |
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} |
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return \is_subclass_of($subTypeName, $superTypeName); |
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} |
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} |
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DaveRandom /
CallbackValidator
