Any interface type, simple type assertions

tuqqu · Sep 11, 2024 · 99f69c0 · 99f69c0
1 parent 51c715d
commit 99f69c0
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Showing 25 changed files with 569 additions and 128 deletions.
diff --git a/src/Builtin/BuiltinFunc/Recover.php b/src/Builtin/BuiltinFunc/Recover.php
@@ -33,7 +33,7 @@ public function __invoke(Argv $argv): InterfaceValue
         }
 
         // fixme type
-        return InterfaceValue::nil(new InterfaceType());
+        return InterfaceValue::nil(InterfaceType::any());
     }
 
     public function name(): string

diff --git a/src/Builtin/StdBuiltinProvider.php b/src/Builtin/StdBuiltinProvider.php
@@ -19,6 +19,7 @@
 use GoPhp\Builtin\BuiltinFunc\Real;
 use GoPhp\Builtin\BuiltinFunc\Recover;
 use GoPhp\Env\Environment;
+use GoPhp\GoType\InterfaceType;
 use GoPhp\GoType\NamedType;
 use GoPhp\GoType\UntypedType;
 use GoPhp\GoValue\BoolValue;
@@ -113,5 +114,6 @@ protected function defineTypes(Environment $env): void
 
         $env->defineTypeAlias('byte', $uint8);
         $env->defineTypeAlias('rune', $int32);
+        $env->defineTypeAlias('any', new TypeValue(InterfaceType::any()));
     }
 }
diff --git a/src/Error/InterfaceTypeError.php b/src/Error/InterfaceTypeError.php
@@ -4,37 +4,36 @@
 
 namespace GoPhp\Error;
 
+use GoPhp\GoType\GoType;
 use GoPhp\GoType\InterfaceType;
-use GoPhp\GoType\WrappedType;
-use GoPhp\GoValue\WrappedValue;
+use GoPhp\GoValue\GoValue;
 
 use function sprintf;
 
 class InterfaceTypeError extends RuntimeError
 {
-    private WrappedValue|WrappedType|null $value = null;
+    private GoValue|GoType|null $value = null;
     private ?string $missingMethod = null;
 
-    public static function cannotUseAsInterfaceType(WrappedValue|WrappedType $value, InterfaceType $interfaceType): self
+    public static function cannotUseAsInterfaceType(GoValue|GoType $value, InterfaceType $interfaceType): self
     {
         $missingMethod = (string) $interfaceType->tryGetMissingMethod(
-            $value instanceof WrappedType
+            $value instanceof GoType
                 ? $value
                 : $value->type(),
         );
 
         $error = self::cannotUseAsType($value, $interfaceType, $missingMethod);
-
         $error->value = $value;
         $error->missingMethod = $missingMethod;
 
         return $error;
     }
 
-    public static function fromOther(self $error, WrappedType $interfaceType): self
+    public static function fromOther(self $error, GoType $interfaceType): self
     {
         if (!isset($error->value, $error->missingMethod)) {
-            throw InternalError::unreachable('cannot convert error from other error');
+            throw InternalError::unreachable('cannot create interface error from another error');
         }
 
         return self::cannotUseAsType(
@@ -45,21 +44,21 @@ public static function fromOther(self $error, WrappedType $interfaceType): self
     }
 
     private static function cannotUseAsType(
-        WrappedValue|WrappedType $value,
-        InterfaceType|WrappedType $interfaceType,
+        GoValue|GoType $value,
+        InterfaceType|GoType $interfaceType,
         string $missingMethod,
     ): self {
         return new self(
             sprintf(
-                "cannot use %s (value of type %s) as type %s:\n\t%s does not implement %s (missing %s method)",
-                $value instanceof WrappedType
+                'cannot use %s (value of type %s) as type %s: %s does not implement %s (missing method %s)',
+                $value instanceof GoType
                     ? $value->name()
                     : self::valueToString($value),
-                $value instanceof WrappedType
+                $value instanceof GoType
                     ? $value->name()
                     : $value->type()->name(),
                 $interfaceType->name(),
-                $value instanceof WrappedType
+                $value instanceof GoType
                     ? $value->name()
                     : $value->type()->name(),
                 $interfaceType->name(),

diff --git a/src/Error/InternalError.php b/src/Error/InternalError.php
@@ -5,6 +5,7 @@
 namespace GoPhp\Error;
 
 use LogicException;
+use ReflectionClass;
 
 use function get_debug_type;
 use function is_object;
@@ -14,6 +15,8 @@
 /**
  * Errors that indicate a bug in the code.
  * They must not occur even when running a wrongly written program.
+ *
+ * Non-implemented yet features also throw this exception.
  */
 final class InternalError extends LogicException
 {
@@ -25,7 +28,7 @@ public static function unreachableMethodCall(): self
     public static function unreachable(object|string|null $context): self
     {
         $context = match (true) {
-            is_object($context) => $context::class,
+            is_object($context) => (new ReflectionClass($context))->getShortName(),
             is_string($context) => $context,
             $context === null => '',
         };

diff --git a/src/Error/PanicError.php b/src/Error/PanicError.php
@@ -4,7 +4,10 @@
 
 namespace GoPhp\Error;
 
+use GoPhp\GoType\GoType;
+use GoPhp\GoType\UntypedNilType;
 use GoPhp\GoValue\AddressableValue;
+use GoPhp\GoValue\Interface\InterfaceValue;
 use GoPhp\GoValue\String\UntypedStringValue;
 use RuntimeException;
 
@@ -31,6 +34,27 @@ public static function nilMapAssignment(): self
         return new self(new UntypedStringValue('assignment to entry in nil map'));
     }
 
+    public static function interfaceConversion(InterfaceValue $interface, GoType $type): self
+    {
+        return new self(new UntypedStringValue(
+            sprintf(
+                'interface conversion: %s is %s, not %s',
+                $interface->type()->name(),
+                $interface->isNil()
+                    ? UntypedNilType::NAME
+                    : $interface->value->type()->name(),
+                $type->name(),
+            ),
+        ));
+    }
+
+    public static function indexOutOfRange(int $index, int $len): self
+    {
+        return new self(new UntypedStringValue(
+            sprintf('index out of range [%d] with length %d', $index, $len),
+        ));
+    }
+
     public function getPosition(): null
     {
         return null;

diff --git a/src/Error/RuntimeError.php b/src/Error/RuntimeError.php
@@ -181,6 +181,11 @@ public static function cannotFindPackage(string $path): self
         return new self(sprintf('cannot find package "." in: %s', $path));
     }
 
+    public static function typeOutsideTypeSwitch(): self
+    {
+        return new self('invalid syntax tree: use of .(type) outside type switch');
+    }
+
     public static function undefinedOperator(Operator $op, AddressableValue $value, bool $unary = false): self
     {
         if ($op === Operator::Eq) {
@@ -360,6 +365,16 @@ public static function wrongFirstArgumentTypeForAppend(Arg $arg): self
         );
     }
 
+    public static function nonInterfaceAssertion(GoValue $value): self
+    {
+        return new self(
+            sprintf(
+                'invalid operation: %s is not an interface',
+                self::valueToString($value),
+            ),
+        );
+    }
+
     public static function indexNegative(GoValue|int $value): self
     {
         return new self(
@@ -380,11 +395,6 @@ public static function nonConstantExpr(GoValue $value): self
         return new self(sprintf('%s is not constant', self::valueToString($value)));
     }
 
-    public static function indexOutOfRange(int $index, int $len): self
-    {
-        return new self(sprintf('index out of range [%d] with length %d', $index, $len));
-    }
-
     public static function invalidSliceIndices(int $low, int $high): self
     {
         return new self(sprintf('invalid slice indices: %d < %d', $low, $high));

diff --git a/src/GoType/InterfaceType.php b/src/GoType/InterfaceType.php
@@ -15,18 +15,37 @@
 use function sprintf;
 
 /**
+ * @psalm-type MethodMap = array<string, FuncType>
  * @template-implements Hashable<string>
  */
-final class InterfaceType implements Hashable, GoType
+final class InterfaceType implements Hashable, RefType
 {
     /**
-     * @param array<string, FuncType> $methods
+     * @param MethodMap $methods
      */
-    public function __construct(
-        private readonly array $methods = [],
-        private readonly ?Environment $envRef = null,
+    private function __construct(
+        private readonly array $methods,
+        private readonly ?Environment $envRef,
     ) {}
 
+    /**
+     * @param MethodMap $methods
+     */
+    public static function withMethods(array $methods, Environment $envRef): self
+    {
+        return new self($methods, $envRef);
+    }
+
+    public static function any(): self
+    {
+        return new self([], null);
+    }
+
+    public function isAny(): bool
+    {
+        return empty($this->methods);
+    }
+
     public function name(): string
     {
         $methods = [];
@@ -43,18 +62,37 @@ public function name(): string
 
     public function equals(GoType $other): bool
     {
-        return match (true) {
-            $other instanceof UntypedNilType,
-            $other instanceof self => true,
-            $other instanceof WrappedType => $this->checkWrappedType($other),
-            default => false,
-        };
+        if ($other instanceof UntypedNilType) {
+            return true;
+        }
+
+        if ($this->isAny()) {
+            return true;
+        }
+
+        if (!$other instanceof self) {
+            return false;
+        }
+
+        if ($this->noMissingMethods($other)) {
+            return true;
+        }
+
+        return false;
     }
 
     public function isCompatible(GoType $other): bool
     {
-        return $other instanceof UntypedNilType
-            || $this->equals($other);
+        if ($this->isAny()) {
+            return true;
+        }
+
+        return match (true) {
+            $other instanceof UntypedNilType => true,
+            $other instanceof WrappedType,
+            $other instanceof self => $this->noMissingMethods($other),
+            default => false,
+        };
     }
 
     public function zeroValue(): InterfaceValue
@@ -68,7 +106,7 @@ public function convert(AddressableValue $value): AddressableValue
             return $value;
         }
 
-        if ($this->checkWrappedType($value->type())) {
+        if ($this->noMissingMethods($value->type())) {
             return $value;
         }
 
@@ -80,30 +118,35 @@ public function hash(): string
         return $this->name();
     }
 
-    public function tryGetMissingMethod(WrappedType $other): ?string
+    public function tryGetMissingMethod(GoType $other): ?string
     {
         if ($this->envRef === null) {
             return null;
         }
 
         foreach ($this->methods as $name => $method) {
             if (
-                !$this->envRef->hasMethod($name, $other)
+                $other instanceof WrappedType
+                && !$this->envRef->hasMethod($name, $other)
                 && !$this->envRef->hasMethod($name, $other->underlyingType)
             ) {
                 return $name;
             }
+
+            if ($other instanceof self) {
+                $hasMethod = isset($other->methods[$name]) && $method->equals($other->methods[$name]);
+
+                if (!$hasMethod) {
+                    return $name;
+                }
+            }
         }
 
         return null;
     }
 
-    private function checkWrappedType(WrappedType $other): bool
+    private function noMissingMethods(self|WrappedType $other): bool
     {
-        if ($this->envRef === null) {
-            return true;
-        }
-
         return $this->tryGetMissingMethod($other) === null;
     }
 }
diff --git a/src/GoType/UntypedNilType.php b/src/GoType/UntypedNilType.php
@@ -12,6 +12,8 @@
  */
 final class UntypedNilType implements RefType
 {
+    public const string NAME = 'nil';
+
     public function name(): string
     {
         return 'untyped nil';

diff --git a/src/GoType/UntypedType.php b/src/GoType/UntypedType.php
@@ -138,12 +138,20 @@ public function isString(): bool
         return $this === self::UntypedString;
     }
 
-    public function convert(AddressableValue $value): never
+    public function zeroValue(): AddressableValue
     {
-        throw InternalError::unreachableMethodCall();
+        return (match ($this) {
+            self::UntypedInt => NamedType::Int,
+            self::UntypedRune => NamedType::Int32,
+            self::UntypedRoundFloat,
+            self::UntypedFloat => NamedType::Float64,
+            self::UntypedBool => NamedType::Bool,
+            self::UntypedComplex => NamedType::Complex128,
+            self::UntypedString => NamedType::String,
+        })->zeroValue();
     }
 
-    public function zeroValue(): never
+    public function convert(AddressableValue $value): never
     {
         throw InternalError::unreachableMethodCall();
     }

diff --git a/src/GoValue/Float/UntypedFloatValue.php b/src/GoValue/Float/UntypedFloatValue.php
@@ -8,7 +8,7 @@
 
 final class UntypedFloatValue extends FloatNumber
 {
-    private UntypedType $type;
+    private readonly UntypedType $type;
 
     public function __construct(float $value)
     {