Class: RBS::DefinitionBuilder

Inherits:
Object
  • Object
show all
Defined in:
lib/rbs/definition_builder.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(env:) ⇒ DefinitionBuilder

Returns a new instance of DefinitionBuilder.



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# File 'lib/rbs/definition_builder.rb', line 7

def initialize(env:)
  @env = env
  @instance_cache = {}
  @singleton_cache = {}
end

Instance Attribute Details

#env ⇒ Object (readonly)

Returns the value of attribute env.



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# File 'lib/rbs/definition_builder.rb', line 3

def env
  @env
end

#instance_cache ⇒ Object (readonly)

Returns the value of attribute instance_cache.



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# File 'lib/rbs/definition_builder.rb', line 4

def instance_cache
  @instance_cache
end

#singleton_cache ⇒ Object (readonly)

Returns the value of attribute singleton_cache.



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# File 'lib/rbs/definition_builder.rb', line 5

def singleton_cache
  @singleton_cache
end

Instance Method Details

#absolute_type(type, namespace:) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 903

def absolute_type(type, namespace:)
  env.absolute_type(type, namespace: namespace) do |type|
    NoTypeFoundError.check!(type.name.absolute!, env: env, location: type.location)
  end
end

#absolute_type_name(type_name, namespace:, location:) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 909

def absolute_type_name(type_name, namespace:, location:)
  env.absolute_type_name(type_name, namespace: namespace) do |type_name|
    NoTypeFoundError.check!(type_name.absolute!, env: env, location: location)
  end
end

#build_ancestors(self_ancestor, ancestors: [], building_ancestors: [], location: nil) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 13

def build_ancestors(self_ancestor, ancestors: [], building_ancestors: [], location: nil)
  decl = env.find_class(self_ancestor.name)
  namespace = self_ancestor.name.absolute!.to_namespace

  RecursiveAncestorError.check!(self_ancestor,
                                ancestors: building_ancestors,
                                location: location || decl.location)
  building_ancestors.push self_ancestor

  case self_ancestor
  when Definition::Ancestor::Instance
    args = self_ancestor.args
    param_names = decl.type_params.each.map(&:name)

    InvalidTypeApplicationError.check!(
      type_name: self_ancestor.name,
      args: args,
      params: decl.type_params,
      location: location || decl.location
    )

    sub = Substitution.build(param_names, args)

    case decl
    when AST::Declarations::Class
      unless self_ancestor.name == BuiltinNames::BasicObject.name
        super_ancestor = decl.super_class&.yield_self do |super_class|
          Definition::Ancestor::Instance.new(
            name: absolute_type_name(super_class.name, namespace: namespace, location: location || decl.location),
            args: super_class.args.map {|ty| absolute_type(ty.sub(sub), namespace: namespace) }
          )
        end || Definition::Ancestor::Instance.new(name: BuiltinNames::Object.name, args: [])

        build_ancestors(super_ancestor, ancestors: ancestors, building_ancestors: building_ancestors)
      end
    end

    decl.members.each do |member|
      case member
      when AST::Members::Include
        if member.name.class?
          ancestor = Definition::Ancestor::Instance.new(
            name: absolute_type_name(member.name, namespace: namespace, location: member.location),
            args: member.args.map {|ty| absolute_type(ty.sub(sub), namespace: namespace) }
          )
          build_ancestors ancestor, ancestors: ancestors, building_ancestors: building_ancestors, location: member.location
        end
      end
    end

    ancestors.unshift(self_ancestor)

    env.each_extension(self_ancestor.name).sort_by {|e| e.extension_name.to_s }.each do |extension|
      InvalidExtensionParameterError.check!(
        type_name: self_ancestor.name,
        extension_name: extension.extension_name,
        extension_params: extension.type_params,
        class_params: self_ancestor.args.map(&:name),
        location: extension.location
      )

      sub = Substitution.build(extension.type_params, self_ancestor.args)

      extension.members.each do |member|
        case member
        when AST::Members::Include
          if member.name.class?
            ancestor = Definition::Ancestor::Instance.new(
              name: absolute_type_name(member.name, namespace: namespace, location: member.location),
              args: member.args.map {|ty| absolute_type(ty.sub(sub), namespace: namespace) }
            )
            build_ancestors ancestor, ancestors: ancestors, building_ancestors: building_ancestors, location: member.location
          end
        end
      end

      extension_ancestor = Definition::Ancestor::ExtensionInstance.new(
        name: extension.name.absolute!,
        extension_name: extension.extension_name,
        args: self_ancestor.args,
      )
      ancestors.unshift(extension_ancestor)

      extension.members.each do |member|
        case member
        when AST::Members::Prepend
          if member.name.class?
            ancestor = Definition::Ancestor::Instance.new(
              name: absolute_type_name(member.name, namespace: namespace, location: member.location),
              args: member.args.map {|ty| absolute_type(ty.sub(sub), namespace: namespace) }
            )
            build_ancestors ancestor, ancestors: ancestors, building_ancestors: building_ancestors, location: member.location
          end
        end
      end
    end

    decl.members.each do |member|
      case member
      when AST::Members::Prepend
        ancestor = Definition::Ancestor::Instance.new(
          name: absolute_type_name(member.name, namespace: namespace, location: member.location),
          args: member.args.map {|ty| absolute_type(ty.sub(sub), namespace: namespace) }
        )
        build_ancestors ancestor, ancestors: ancestors, building_ancestors: building_ancestors, location: member.location
      end
    end
  when Definition::Ancestor::Singleton
    case decl
    when AST::Declarations::Class
      if self_ancestor.name == BuiltinNames::BasicObject.name
        class_ancestor = Definition::Ancestor::Instance.new(
          name: BuiltinNames::Class.name,
          args: []
        )
        build_ancestors class_ancestor, ancestors: ancestors, building_ancestors: building_ancestors
      else
        super_ancestor = decl.super_class&.yield_self do |super_class|
          Definition::Ancestor::Singleton.new(
            name: absolute_type_name(super_class.name, namespace: namespace, location: location || decl.location)
          )
        end || Definition::Ancestor::Singleton.new(name: BuiltinNames::Object.name)

        build_ancestors(super_ancestor, ancestors: ancestors, building_ancestors: building_ancestors)
      end
    when AST::Declarations::Module
      module_ancestor = Definition::Ancestor::Instance.new(
        name: BuiltinNames::Module.name,
        args: []
      )
      build_ancestors module_ancestor, ancestors: ancestors, building_ancestors: building_ancestors
    end

    decl.members.each do |member|
      case member
      when AST::Members::Extend
        if member.name.class?
          ancestor = Definition::Ancestor::Instance.new(
            name: absolute_type_name(member.name, namespace: namespace, location: member.location),
            args: member.args.map {|ty| absolute_type(ty.sub(sub), namespace: namespace) }
          )
          build_ancestors ancestor, ancestors: ancestors, building_ancestors: building_ancestors, location: member.location
        end
      end
    end

    ancestors.unshift(self_ancestor)

    env.each_extension(self_ancestor.name).sort_by {|e| e.extension_name.to_s }.each do |extension|
      extension.members.each do |member|
        case member
        when AST::Members::Extend
          if member.name.class?
            ancestor = Definition::Ancestor::Instance.new(
              name: absolute_type_name(member.name, namespace: namespace, location: member.location),
              args: member.args.map {|ty| absolute_type(ty, namespace: namespace) }
            )
            build_ancestors ancestor, ancestors: ancestors, building_ancestors: building_ancestors, location: member.location
          end
        end
      end

      extension_ancestor = Definition::Ancestor::ExtensionSingleton.new(
        name: extension.name.absolute!,
        extension_name: extension.extension_name
      )
      ancestors.unshift(extension_ancestor)
    end
  end

  building_ancestors.pop

  ancestors
end

#build_instance(type_name) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 201

def build_instance(type_name)
  try_cache type_name, cache: instance_cache do
    decl = env.find_class(type_name)
    self_ancestor = Definition::Ancestor::Instance.new(name: type_name,
                                                       args: Types::Variable.build(decl.type_params.each.map(&:name)))
    self_type = Types::ClassInstance.new(name: type_name, args: self_ancestor.args, location: nil)

    case decl
    when AST::Declarations::Class, AST::Declarations::Module
      ancestors = build_ancestors(self_ancestor)
      definition_pairs = ancestors.map do |ancestor|
        case ancestor
        when Definition::Ancestor::Instance
          [ancestor, build_one_instance(ancestor.name)]
        when Definition::Ancestor::Singleton
          [ancestor, build_one_singleton(ancestor.name)]
        when Definition::Ancestor::ExtensionInstance
          [ancestor, build_one_instance(ancestor.name, extension_name: ancestor.extension_name)]
        when Definition::Ancestor::ExtensionSingleton
          [ancestor, build_one_extension_singleton(ancestor.name, extension_name: ancestor.extension_name)]
        end
      end

      if decl.is_a?(AST::Declarations::Module)
        if decl.self_type
          self_interface = absolute_type(decl.self_type, namespace: type_name.to_namespace)
          ancestor = Definition::Ancestor::Instance.new(name: self_interface.name,
                                                        args: self_interface.args)

          definition_pairs.push [ancestor, build_one_instance(ancestor.name)]
        end
      end

      merge_definitions(definition_pairs, decl: decl, self_type: self_type, ancestors: ancestors)
    end
  end
end

#build_interface(type_name, declaration = env.find_class(type_name)) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 819

def build_interface(type_name, declaration = env.find_class(type_name))
  self_type = Types::Interface.new(
    name: type_name,
    args: declaration.type_params.each.map {|p| Types::Variable.new(name: p.name, location: nil) },
    location: nil
  )

  namespace = type_name.to_namespace

  Definition.new(declaration: declaration, self_type: self_type, ancestors: []).tap do |definition|
    alias_members = []

    declaration.members.each do |member|
      case member
      when AST::Members::Include
        mixin_name = env.absolute_interface_name(member.name, namespace: namespace) || member.name.absolute!
        mixin = build_one_instance(mixin_name)

        args = member.args.map {|type| absolute_type(type, namespace: namespace) }
        type_params = mixin.declaration.type_params

        InvalidTypeApplicationError.check!(
          type_name: type_name,
          args: args,
          params: type_params,
          location: member.location
        )

        sub = Substitution.build(type_params.each.map(&:name), args)
        mixin.methods.each do |name, method|
          definition.methods[name] = method.sub(sub)
        end
      end
    end

    declaration.members.each do |member|
      case member
      when AST::Members::MethodDefinition
        DuplicatedMethodDefinitionError.check!(
          decl: declaration,
          methods: definition.methods,
          name: member.name,
          location: member.location
        )

        method = Definition::Method.new(
          super_method: nil,
          method_types: member.types.map do |method_type|
            method_type.map_type {|ty| absolute_type(ty, namespace: namespace) }
          end,
          defined_in: declaration,
          implemented_in: nil,
          accessibility: :public,
          attributes: member.attributes,
          annotations: member.annotations,
          comment: member.comment
        )
        definition.methods[member.name] = method
      when AST::Members::Alias
        alias_members << member
      end
    end

    alias_members.each do |member|
      UnknownMethodAliasError.check!(
        methods: definition.methods,
        original_name: member.old_name,
        aliased_name: member.new_name,
        location: member.location
      )

      DuplicatedMethodDefinitionError.check!(
        decl: declaration,
        methods: definition.methods,
        name: member.new_name,
        location: member.location
      )

      # FIXME: may cause a problem if #old_name has super type
      definition.methods[member.new_name] = definition.methods[member.old_name]
    end
  end
end

#build_one_instance(type_name, extension_name: nil) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 316

def build_one_instance(type_name, extension_name: nil)
  decl = if extension_name
           env.each_extension(type_name).find {|ext| ext.extension_name == extension_name } or
             raise "Unknown extension: #{type_name} (#{extension_name})"
         else
           env.find_class(type_name)
         end

  case decl
  when AST::Declarations::Interface
    build_interface type_name, decl
  else
    namespace = type_name.to_namespace

    case decl
    when AST::Declarations::Class, AST::Declarations::Module
      self_type = Types::ClassInstance.new(name: type_name,
                                           args: Types::Variable.build(decl.type_params.each.map(&:name)),
                                           location: nil)
      ancestors = [Definition::Ancestor::Instance.new(name: type_name, args: self_type.args)]
    when AST::Declarations::Extension
      self_type = Types::ClassInstance.new(name: type_name, args: Types::Variable.build(decl.type_params), location: nil)
      ancestors = [Definition::Ancestor::ExtensionInstance.new(name: type_name,
                                                               extension_name: extension_name,
                                                               args: self_type.args)]
    end

    Definition.new(declaration: decl, self_type: self_type, ancestors: ancestors).tap do |definition|
      alias_members = []

      each_member_with_accessibility(decl.members) do |member, accessibility|
        case member
        when AST::Members::MethodDefinition
          if member.instance?
            name = member.name
            method_types = member.types.map do |method_type|
              case method_type
              when MethodType
                method_type.map_type do |type|
                  absolute_type(type, namespace: namespace)
                end
              when :super
                :super
              end
            end

            DuplicatedMethodDefinitionError.check!(
              decl: decl,
              methods: definition.methods,
              name: name,
              location: member.location
            )

            attrs = if name == :initialize
                      (member.attributes + [:incompatible]).uniq
                    else
                      member.attributes
                    end

            definition.methods[name] = Definition::Method.new(super_method: nil,
                                                              method_types: method_types,
                                                              defined_in: decl,
                                                              implemented_in: decl,
                                                              accessibility: accessibility,
                                                              attributes: attrs,
                                                              annotations: member.annotations,
                                                              comment: member.comment)
          end
        when AST::Members::AttrReader, AST::Members::AttrAccessor, AST::Members::AttrWriter
          name = member.name
          type = absolute_type(member.type, namespace: namespace)
          ivar_name = case member.ivar_name
                      when false
                        nil
                      else
                        member.ivar_name || :"@#{member.name}"
                      end

          if member.is_a?(AST::Members::AttrReader) || member.is_a?(AST::Members::AttrAccessor)
            definition.methods[name] = Definition::Method.new(
              super_method: nil,
              method_types: [
                MethodType.new(
                  type_params: [],
                  type: Types::Function.empty(type),
                  block: nil,
                  location: nil
                )
              ],
              defined_in: decl,
              implemented_in: decl,
              accessibility: accessibility,
              attributes: [],
              annotations: member.annotations,
              comment: member.comment
            )
          end

          if member.is_a?(AST::Members::AttrWriter) || member.is_a?(AST::Members::AttrAccessor)
            definition.methods[:"#{name}="] = Definition::Method.new(
              super_method: nil,
              method_types: [
                MethodType.new(
                  type_params: [],
                  type: Types::Function.new(required_positionals: [Types::Function::Param.new(name: name, type: type)],
                                            optional_positionals: [],
                                            rest_positionals: nil,
                                            trailing_positionals: [],
                                            required_keywords: {},
                                            optional_keywords: {},
                                            rest_keywords: nil,
                                            return_type: type),
                  block: nil,
                  location: nil
                )
              ],
              defined_in: decl,
              implemented_in: decl,
              accessibility: accessibility,
              attributes: [],
              annotations: member.annotations,
              comment: member.comment
            )
          end

          if ivar_name
            definition.instance_variables[ivar_name] = Definition::Variable.new(
              parent_variable: nil,
              type: type,
              declared_in: decl
            )
          end

        when AST::Members::Alias
          if member.instance?
            alias_members << member
          end
        when AST::Members::Include
          if member.name.interface?
            absolute_name = absolute_type_name(member.name, namespace: namespace, location: member.location)
            interface_definition = build_one_instance(absolute_name)
            absolute_args = member.args.map {|ty| absolute_type(ty, namespace: namespace) }

            InvalidTypeApplicationError.check!(
              type_name: absolute_name,
              args: absolute_args,
              params: interface_definition.type_params_decl,
              location: member.location
            )

            sub = Substitution.build(interface_definition.type_params, absolute_args)
            interface_definition.methods.each do |name, method|
              method_types = method.method_types.map do |method_type|
                method_type.sub(sub).map_type do |type|
                  absolute_type(type, namespace: namespace)
                end
              end

              DuplicatedMethodDefinitionError.check!(
                decl: decl,
                methods: definition.methods,
                name: name,
                location: member.location
              )

              definition.methods[name] = Definition::Method.new(
                super_method: nil,
                method_types: method_types,
                defined_in: method.defined_in,
                implemented_in: decl,
                accessibility: method.accessibility,
                attributes: [],
                annotations: method.annotations,
                comment: member.comment
              )
            end
          end
        when AST::Members::InstanceVariable
          definition.instance_variables[member.name] = Definition::Variable.new(
            type: absolute_type(member.type, namespace: namespace),
            parent_variable: nil,
            declared_in: decl
          )
        when AST::Members::ClassVariable
          definition.class_variables[member.name] = Definition::Variable.new(
            type: absolute_type(member.type, namespace: namespace),
            parent_variable: nil,
            declared_in: decl
          )
        end
      end

      alias_members.each do |member|
        UnknownMethodAliasError.check!(
          methods: definition.methods,
          original_name: member.old_name,
          aliased_name: member.new_name,
          location: member.location
        )

        DuplicatedMethodDefinitionError.check!(
          decl: decl,
          methods: definition.methods,
          name: member.new_name,
          location: member.location
        )

        # FIXME: may cause a problem if #old_name has super type
        definition.methods[member.new_name] = definition.methods[member.old_name]
      end

      validate_parameter_variance(
        decl: decl,
        methods: definition.methods
      )
    end
  end
end

#build_one_singleton(type_name, extension_name: nil) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 613

def build_one_singleton(type_name, extension_name: nil)
  decl = if extension_name
           env.each_extension(type_name).find {|ext| ext.extension_name == extension_name } or
             raise "Unknown extension: #{type_name} (#{extension_name})"
         else
           env.find_class(type_name)
         end

  namespace = type_name.to_namespace

  case decl
  when AST::Declarations::Module, AST::Declarations::Class
    self_type = Types::ClassSingleton.new(name: type_name, location: nil)
    ancestors = [Definition::Ancestor::Singleton.new(name: type_name)]
  when AST::Declarations::Extension
    self_type = Types::ClassSingleton.new(name: type_name, location: nil)
    ancestors = [Definition::Ancestor::ExtensionSingleton.new(name: type_name, extension_name: extension_name)]
  end

  Definition.new(declaration: decl, self_type: self_type, ancestors: ancestors).tap do |definition|
    alias_members = []

    each_member_with_accessibility(decl.members) do |member, accessibility|
      case member
      when AST::Members::MethodDefinition
        if member.singleton?
          name = member.name
          method_types = member.types.map do |method_type|
            method_type.map_type do |type|
              absolute_type(type, namespace: namespace)
            end
          end

          DuplicatedMethodDefinitionError.check!(
            decl: decl,
            methods: definition.methods,
            name: name,
            location: member.location
          )

          definition.methods[name] = Definition::Method.new(super_method: nil,
                                                            method_types: method_types,
                                                            defined_in: decl,
                                                            implemented_in: decl,
                                                            accessibility: accessibility,
                                                            attributes: member.attributes,
                                                            annotations: member.annotations,
                                                            comment: member.comment)
        end
      when AST::Members::Alias
        if member.singleton?
          alias_members << member
        end
      when AST::Members::Extend
        if member.name.interface?
          absolute_name = absolute_type_name(member.name, namespace: namespace, location: member.location)
          interface_definition = build_one_instance(absolute_name)
          absolute_args = member.args.map {|ty| absolute_type(ty, namespace: namespace) }

          InvalidTypeApplicationError.check!(
            type_name: absolute_name,
            args: absolute_args,
            params: interface_definition.type_params_decl,
            location: member.location
          )

          sub = Substitution.build(interface_definition.type_params, absolute_args)
          interface_definition.methods.each do |name, method|
            method_types = method.method_types.map do |method_type|
              method_type.sub(sub).map_type do |type|
                absolute_type(type, namespace: namespace)
              end
            end

            DuplicatedMethodDefinitionError.check!(
              decl: decl,
              methods: definition.methods,
              name: name,
              location: member.location
            )

            definition.methods[name] = Definition::Method.new(
              super_method: nil,
              method_types: method_types,
              defined_in: method.defined_in,
              implemented_in: decl,
              accessibility: method.accessibility,
              attributes: method.attributes,
              annotations: method.annotations,
              comment: member.comment
            )
          end
        end
      when AST::Members::ClassInstanceVariable
        definition.instance_variables[member.name] = Definition::Variable.new(
          type: absolute_type(member.type, namespace: namespace),
          parent_variable: nil,
          declared_in: decl
        )
      when AST::Members::ClassVariable
        definition.class_variables[member.name] = Definition::Variable.new(
          type: absolute_type(member.type, namespace: namespace),
          parent_variable: nil,
          declared_in: decl
        )
      end
    end

    alias_members.each do |member|
      UnknownMethodAliasError.check!(
        methods: definition.methods,
        original_name: member.old_name,
        aliased_name: member.new_name,
        location: member.location
      )

      DuplicatedMethodDefinitionError.check!(
        decl: decl,
        methods: definition.methods,
        name: member.new_name,
        location: member.location
      )

      # FIXME: may cause a problem if #old_name has super type
      definition.methods[member.new_name] = definition.methods[member.old_name]
    end
  end
end

#build_singleton(type_name) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 239

def build_singleton(type_name)
  try_cache type_name, cache: singleton_cache do
    decl = env.find_class(type_name)
    self_ancestor = Definition::Ancestor::Singleton.new(name: type_name)
    self_type = Types::ClassSingleton.new(name: type_name, location: nil)

    case decl
    when AST::Declarations::Class, AST::Declarations::Module
      ancestors = build_ancestors(self_ancestor)
      definition_pairs = ancestors.map do |ancestor|
        case ancestor
        when Definition::Ancestor::Instance
          [ancestor, build_one_instance(ancestor.name)]
        when Definition::Ancestor::Singleton
          [ancestor, build_one_singleton(ancestor.name)]
        when Definition::Ancestor::ExtensionInstance
          [ancestor, build_one_instance(ancestor.name, extension_name: ancestor.extension_name)]
        when Definition::Ancestor::ExtensionSingleton
          [ancestor, build_one_singleton(ancestor.name, extension_name: ancestor.extension_name)]
        end
      end

      if decl.is_a?(AST::Declarations::Class)
        definition_pairs.find {|ancestor, _| ancestor == self_ancestor }.tap do |_, definition|
          unless definition.methods[:new]&.implemented_in == decl
            instance_definition = build_instance(type_name)
            class_params = decl.type_params.each.map(&:name)
            initialize_method = instance_definition.methods[:initialize]
            method_types = initialize_method.method_types.map do |method_type|
              case method_type
              when MethodType
                fvs = method_type.free_variables + class_params
                unless fvs.empty?
                  param_name_set = Set.new(class_params)
                  bound_variables = method_type.type_params
                  renamed_types = bound_variables.map do |x|
                    if param_name_set.member?(x)
                      Types::Variable.fresh(x)
                    else
                      Types::Variable.new(name: x, location: nil)
                    end
                  end
                  sub = Substitution.build(bound_variables, renamed_types)
                  method_type_params = renamed_types.unshift(*class_params)
                else
                  sub = Substitution.build([], [])
                  method_type_params = method_type.type_params
                end

                MethodType.new(
                  type_params: method_type_params,
                  type: method_type.type.sub(sub).with_return_type(instance_definition.self_type),
                  block: method_type.block&.yield_self {|ty| ty.sub(sub) },
                  location: method_type.location
                )
              end
            end.compact

            definition.methods[:new] = Definition::Method.new(
              super_method: nil,
              defined_in: nil,
              implemented_in: env.find_class(RBS::BuiltinNames::Class.name),
              method_types: method_types,
              accessibility: :public,
              attributes: [:incompatible],
              annotations: [],
              comment: nil
            )
          end
        end
      end

      merge_definitions(definition_pairs, decl: decl, self_type: self_type, ancestors: ancestors)
    end
  end
end

#each_member_with_accessibility(members, accessibility: :public) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 188

def each_member_with_accessibility(members, accessibility: :public)
  members.each do |member|
    case member
    when AST::Members::Public
      accessibility = :public
    when AST::Members::Private
      accessibility = :private
    else
      yield member, accessibility
    end
  end
end

#expand_alias(type_name) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 915

def expand_alias(type_name)
  absolute_type(env.find_alias(type_name).type, namespace: type_name.namespace)
end

#merge_definitions(pairs, decl:, self_type:, ancestors:) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 742

def merge_definitions(pairs, decl:, self_type:, ancestors:)
  Definition.new(declaration: decl, self_type: self_type, ancestors: ancestors).tap do |definition|
    pairs.reverse_each do |(ancestor, current_definition)|
      sub = case ancestor
            when Definition::Ancestor::Instance, Definition::Ancestor::ExtensionInstance
              Substitution.build(current_definition.type_params, ancestor.args)
            when Definition::Ancestor::Singleton, Definition::Ancestor::ExtensionSingleton
              Substitution.build([], [])
            end
      namespace = current_definition.name.absolute!.to_namespace

      current_definition.methods.each do |name, method|
        merge_method definition.methods, name, method, sub, namespace
      end

      current_definition.instance_variables.each do |name, variable|
        merge_variable definition.instance_variables, name, variable
      end

      current_definition.class_variables.each do |name, variable|
        merge_variable definition.class_variables, name, variable
      end
    end
  end
end

#merge_method(methods, name, method, sub, namespace) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 778

def merge_method(methods, name, method, sub, namespace)
  super_method = methods[name]

  methods[name] = Definition::Method.new(
    method_types: method.method_types.flat_map do |method_type|
      case method_type
      when MethodType
        [absolute_type(method_type.sub(sub), namespace: namespace)]
      when :super
        super_method.method_types
      end
    end,
    super_method: super_method,
    defined_in: method.defined_in,
    implemented_in: method.implemented_in,
    accessibility: method.accessibility,
    attributes: method.attributes,
    annotations: method.annotations,
    comment: method.comment
  )
end

#merge_variable(variables, name, variable) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 768

def merge_variable(variables, name, variable)
  super_variable = variables[name]

  variables[name] = Definition::Variable.new(
    parent_variable: super_variable,
    type: variable.type,
    declared_in: variable.declared_in
  )
end

#try_cache(type_name, cache:) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 800

def try_cache(type_name, cache:)
  cached = cache[type_name]

  case cached
  when Definition
    cached
  when false
    raise
  when nil
    cache[type_name] = false
    begin
      cache[type_name] = yield
    rescue => ex
      cache[type_name] = nil
      raise ex
    end
  end
end

#validate_parameter_variance(decl:, methods:) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 545

def validate_parameter_variance(decl:, methods:)
  type_params = case decl
                when AST::Declarations::Extension
                  env.find_class(decl.name.absolute!).type_params.rename_to(decl.type_params)
                else
                  decl.type_params
                end

  namespace = decl.name.absolute!.to_namespace
  calculator = VarianceCalculator.new(builder: self)
  param_names = type_params.each.map(&:name)

  errors = []

  if decl.is_a?(AST::Declarations::Class)
    if decl.super_class
      absolute_super_name = absolute_type_name(decl.super_class.name, namespace: namespace, location: decl.location)
      absolute_args = decl.super_class.args.map {|type| absolute_type(type, namespace: namespace) }
      result = calculator.in_inherit(name: absolute_super_name, args: absolute_args, variables: param_names)

      validate_params_with type_params, result: result do |param|
        errors.push InvalidVarianceAnnotationError::InheritanceError.new(
          param: param
        )
      end
    end
  end

  decl.members.each do |member|
    case member
    when AST::Members::Include
      if member.name.class?
        absolute_module_name = absolute_type_name(member.name, namespace: namespace, location: decl.location)
        absolute_args = member.args.map {|type| absolute_type(type, namespace: namespace) }
        result = calculator.in_inherit(name: absolute_module_name, args: absolute_args, variables: param_names)

        validate_params_with type_params, result: result do |param|
          errors.push InvalidVarianceAnnotationError::MixinError.new(
            include_member: member,
            param: param
          )
        end
      end
    end
  end

  methods.each do |name, method|
    method.method_types.each do |method_type|
      case method_type
      when MethodType
        result = calculator.in_method_type(method_type: method_type, variables: param_names)

        validate_params_with type_params, result: result do |param|
          errors.push InvalidVarianceAnnotationError::MethodTypeError.new(
            method_name: name,
            method_type: method_type,
            param: param
          )
        end
      end
    end
  end

  unless errors.empty?
    raise InvalidVarianceAnnotationError.new(decl: decl, errors: errors)
  end
end

#validate_params_with(type_params, result:) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 535

def validate_params_with(type_params, result:)
  type_params.each do |param|
    unless param.skip_validation
      unless result.compatible?(param.name, with_annotation: param.variance)
        yield param
      end
    end
  end
end