C# RubyScope.GetMethodDefinitionOwner方法代码示例

 [Emitted] // AliasStatement:
 public static void AliasMethod(RubyScope/*!*/ scope, string/*!*/ newName, string/*!*/ oldName) {
     scope.GetMethodDefinitionOwner().AddMethodAlias(newName, oldName);
 }

        [Emitted] // MethodDeclaration:
        public static RubyMethodInfo/*!*/ DefineMethod(object targetOrSelf, object/*!*/ ast, RubyScope/*!*/ scope,
            bool hasTarget, string/*!*/ name, Delegate/*!*/ clrMethod, int mandatory, int optional, bool hasUnsplatParameter) {

            Assert.NotNull(ast, scope, clrMethod, name);

            RubyModule instanceOwner, singletonOwner;
            RubyMemberFlags instanceFlags, singletonFlags;

            if (hasTarget) {
                if (!RubyUtils.CanCreateSingleton(targetOrSelf)) {
                    throw RubyExceptions.CreateTypeError("can't define singleton method for literals");
                }

                instanceOwner = null;
                instanceFlags = RubyMemberFlags.Invalid;
                singletonOwner = scope.RubyContext.CreateSingletonClass(targetOrSelf);
                singletonFlags = RubyMemberFlags.Public;
            } else {
                // TODO: ???
                var attributesScope = scope.GetMethodAttributesDefinitionScope();
                //var attributesScope = scope;
                if ((attributesScope.MethodAttributes & RubyMethodAttributes.ModuleFunction) == RubyMethodAttributes.ModuleFunction) {
                    // Singleton module-function's scope points to the instance method's RubyMemberInfo.
                    // This affects:
                    // 1) super call
                    //    Super call is looking for Method.DeclaringModule while searching MRO, which would fail if the singleton module-function
                    //    was in MRO. Since module-function can only be used on module the singleton method could only be on module's singleton.
                    //    Module's singleton is never part of MRO so we are safe.
                    // 2) trace
                    //    Method call trace reports non-singleton module.

                    // MRI 1.8: instance method owner is self -> it is possible (via define_method) to define m.f. on a class (bug)
                    // MRI 1.9: instance method owner GetMethodDefinitionOwner
                    // MRI allows to define m.f. on classes but then doesn't work correctly with it.
                    instanceOwner = scope.GetMethodDefinitionOwner();
                    if (instanceOwner.IsClass) {
                        throw RubyExceptions.CreateTypeError("A module function cannot be defined on a class.");
                    }

                    instanceFlags = RubyMemberFlags.ModuleFunction | RubyMemberFlags.Private;
                    singletonOwner = instanceOwner.SingletonClass;
                    singletonFlags = RubyMemberFlags.ModuleFunction | RubyMemberFlags.Public;
                } else {
                    instanceOwner = scope.GetMethodDefinitionOwner();
                    instanceFlags = (RubyMemberFlags)RubyUtils.GetSpecialMethodVisibility(attributesScope.Visibility, name);
                    singletonOwner = null;
                    singletonFlags = RubyMemberFlags.Invalid;
                }
            }
            
            RubyMethodInfo instanceMethod = null, singletonMethod = null;

            if (instanceOwner != null) {
                SetMethod(scope.RubyContext, instanceMethod = 
                    new RubyMethodInfo(ast, clrMethod, instanceOwner, name, mandatory, optional, hasUnsplatParameter, instanceFlags)
                );
            }

            if (singletonOwner != null) {
                SetMethod(scope.RubyContext, singletonMethod =
                    new RubyMethodInfo(ast, clrMethod, singletonOwner, name, mandatory, optional, hasUnsplatParameter, singletonFlags)
                );
            }

            // the method's scope saves the result => singleton module-function uses instance-method
            return instanceMethod ?? singletonMethod;
        }

        [Emitted] // MethodDeclaration:
        public static object DefineMethod(object targetOrSelf, RubyScope/*!*/ scope, RubyMethodBody/*!*/ body) {
            Assert.NotNull(body, scope);

            RubyModule instanceOwner, singletonOwner;
            RubyMemberFlags instanceFlags, singletonFlags;
            bool moduleFunction = false;

            if (body.HasTarget) {
                if (!RubyUtils.CanCreateSingleton(targetOrSelf)) {
                    throw RubyExceptions.CreateTypeError("can't define singleton method for literals");
                }

                instanceOwner = null;
                instanceFlags = RubyMemberFlags.Invalid;
                singletonOwner = scope.RubyContext.CreateSingletonClass(targetOrSelf);
                singletonFlags = RubyMemberFlags.Public;
            } else {
                var attributesScope = scope.GetMethodAttributesDefinitionScope();
                if ((attributesScope.MethodAttributes & RubyMethodAttributes.ModuleFunction) == RubyMethodAttributes.ModuleFunction) {
                    // Singleton module-function's scope points to the instance method's RubyMemberInfo.
                    // This affects:
                    // 1) super call
                    //    Super call is looking for Method.DeclaringModule while searching MRO, which would fail if the singleton module-function
                    //    was in MRO. Since module-function can only be used on module the singleton method could only be on module's singleton.
                    //    Module's singleton is never part of MRO so we are safe.
                    // 2) trace
                    //    Method call trace reports non-singleton module.

                    // MRI 1.8: instance method owner is self -> it is possible (via define_method) to define m.f. on a class (bug)
                    // MRI 1.9: instance method owner GetMethodDefinitionOwner
                    // MRI allows to define m.f. on classes but then doesn't work correctly with it.
                    instanceOwner = scope.GetMethodDefinitionOwner();
                    if (instanceOwner.IsClass) {
                        throw RubyExceptions.CreateTypeError("A module function cannot be defined on a class.");
                    }

                    instanceFlags = RubyMemberFlags.Private;
                    singletonOwner = instanceOwner.SingletonClass;
                    singletonFlags = RubyMemberFlags.Public;
                    moduleFunction = true;
                } else {
                    instanceOwner = scope.GetMethodDefinitionOwner();
                    instanceFlags = (RubyMemberFlags)RubyUtils.GetSpecialMethodVisibility(attributesScope.Visibility, body.Name);
                    singletonOwner = null;
                    singletonFlags = RubyMemberFlags.Invalid;
                }
            }
            
            RubyMethodInfo instanceMethod = null, singletonMethod = null;

            if (instanceOwner != null) {
                SetMethod(scope.RubyContext, instanceMethod =
                    new RubyMethodInfo(body, scope, instanceOwner, instanceFlags)
                );
            }

            if (singletonOwner != null) {
                SetMethod(scope.RubyContext, singletonMethod =
                    new RubyMethodInfo(body, scope, singletonOwner, singletonFlags)
                );
            }

            // the method's scope saves the result => singleton module-function uses instance-method
            var method = instanceMethod ?? singletonMethod;

            method.DeclaringModule.MethodAdded(body.Name);

            if (moduleFunction) {
                Debug.Assert(!method.DeclaringModule.IsClass);
                method.DeclaringModule.SingletonClass.MethodAdded(body.Name);
            }

            return null;
        }

        [Emitted] // AliasStatement:
        public static void AliasMethod(RubyScope/*!*/ scope, string/*!*/ newName, string/*!*/ oldName) {
            // MRI 1.8: if (newName == oldName) return;
            // MRI 1.9: no check

            // lexical lookup:
            RubyModule owner = scope.GetMethodDefinitionOwner();
            RubyMemberInfo method = owner.ResolveMethodFallbackToObject(oldName, true);
            if (method != null) {
                owner.AddMethodAlias(scope.RubyContext, newName, method);
                return;
            }

            throw RubyExceptions.CreateUndefinedMethodError(owner, oldName);
        }